34 results on '"Mathieu Nsenga Kumwimba"'
Search Results
2. Advances in ecotechnological methods for diffuse nutrient pollution control: wicked issues in agricultural and urban watersheds
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Mathieu Nsenga Kumwimba, Bo Zhu, Alexandros I. Stefanakis, Fidelis O. Ajibade, Mawuli Dzakpasu, Elisa Soana, Tao Wang, Muhammad Arif, Diana Kavidia Muyembe, and Temitope Deborah Agboola
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nonpoint source pollution ,agricultural and urban watersheds ,reduce-retain-reuse-restore approach ,modification strategies ,nitrogen and phosphorus ,Environmental sciences ,GE1-350 - Abstract
Considerable time and funding have been committed to tackling nonpoint source (NPS) pollution in agricultural and urban watersheds . Notwithstanding all these efforts, the water quality in many AUWs has not significantly improved. Diffuse nutrient pollution involves the movement of these pollutants between soil and water. Excessive diffuse pollution has been accepted as one of the main causes of failure to attain favorable environmental conditions in freshwater systems. Recently, several technologies and practices have been implemented to manage diffuse pollution, namely: a) source reduction, b) pollutant retention over the movement process; c) nutrient recycling, and d) purification and restoration of the eutrophic water bodies. This paper synthesized the existing knowledge of key methods to tackle diffuse pollution from AUWs. Furthermore, the predominant purification mechanisms and impacting factors are explored, allowing a comprehensive and critical understanding of different control strategies to improve the management of diffuse pollution. Therefore, potential approaches for strengthening the performance of control technologies for diffuse pollution treatment and remediation are discussed. Although adopting source reduction strategies (e.g., the “4R” approach: right rate, right time, right source, and right placement of nutrients) could efficiently decrease surface runoff and pollutant levels, they may not stop runoff from entering nearby streams. Consequently, comprehensive treatment of agricultural runoff still requires extra process retention strategies. Overall, the findings of this paper showed that treatment system design and operational and environmental factors played crucial but variable roles in diffuse pollution treatment. Moreover, the results showed that combining or integrating constructed wetlands with other control technologies could enhance the comprehensive purification of diffuse pollution compared to using a single method. This review proposes a systematic approach for diffuse pollution control based on three components (water, soil and microbiota) and maximizing the regulating services of agroecosystems via land use/cover types. The current review contributes to the documentation of existing research trends. It sheds light on diffuse pollution control approaches in AUWs, and further encourages the development of this vital field.
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- 2023
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- View/download PDF
3. Nitrogen Retention in Mesocosm Sediments Received Rural Wastewater Associated with Microbial Community Response to Plant Species
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Zhixin Dong, Lei Hu, Jianmei Li, Mathieu Nsenga Kumwimba, Jialiang Tang, and Bo Zhu
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microbial community ,rural domestic wastewater ,eco-ditches ,Hydraulic engineering ,TC1-978 ,Water supply for domestic and industrial purposes ,TD201-500 - Abstract
Vegetated drainage ditches (eco-ditches) have drawn much attention in recent years for the ability to remediate diffuse contaminants in rural wastewater through sediment retention, plant uptake and interception, and microbial metabolic activities. However, the effect of plant species on microbial community structure and nitrogen (N) retention in ditch sediment remains poorly understood. In this study, mesocosm plastic drums were planted with eight plant species commonly found in ditches and nurtured with wastewater for 150 days. Sediment total nitrogen (TN) was greatly increased after 150-day nurturing with rural wastewater, from 296.03 mg∙kg−1 (Iris japonica Thunb) to 607.88 mg∙kg−1 (Acorus gramineusO). This study also presents the effect of different plant species on sediment microbial communities, thus providing insight into N removal mechanisms in eco-ditch. Fifty-eight differentially abundant taxa were identified, and sediment microbial community structure for no plant (CK), Acg, Canna indica (Cai), and Typha latifolia L. (Tyl) was primarily linked to sediment NH4+-N and TN. Extremely small proportions of ammonia oxidizing bacteria (AOB) and nitrifying bacteria were detected for all treatments, but large proportions of Crenarchaeota, which comprises the widely existent ammonium oxidized archaea (AOA), were found in CK, Acg and Cai. The abundance of Nitrosotalea from Crenarchaeota presented positive correlations with sediment NH4+-N contents and ammonia oxidation function predicted by Faprotax, indicating Nitrosotalea might be the dominant ammonium-oxidizing microbes in sediment samples. The probable NH4+-N removal pathway in wastewater sediment was through a combined effect of AOA, nitrifying bacteria, and anammox.
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- 2020
- Full Text
- View/download PDF
4. Enhanced nutrient removal in agro-industrial wastes-amended hybrid floating treatment wetlands treating real sewage: Laboratory microcosms to field-scale studies
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Mathieu Nsenga Kumwimba, Jinlou Huang, Mawuli Dzakpasu, Fidelis Odedishemi Ajibade, Xuyong Li, Edmond Sanganyado, Awoke Guadie, Engin Şenel, and Diana Kavidia Muyembe
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Environmental Chemistry ,General Medicine ,General Chemistry ,Pollution - Published
- 2023
5. An updated review of the efficacy of buffer zones in warm/temperate and cold climates: Insights into processes and drivers of nutrient retention
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Mathieu Nsenga Kumwimba, Jinlou Huang, Mawuli Dzakpasu, Koshila De Silva, Okugbe Ebiotubo Ohore, Fidelis Odedishemi Ajibade, Xuyong Li, Su Jingjun, Diana Kavidia Muyembe, and Huang Kaixuan
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Environmental Engineering ,General Medicine ,Management, Monitoring, Policy and Law ,Waste Management and Disposal - Published
- 2023
6. Vegetated urban streams have sufficient purification ability but high internal nutrient loadings: Microbial communities and nutrient release dynamics
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Mathieu Nsenga, Kumwimba, Mawuli, Dzakpasu, Xuyong, Li, Jinlou, Huang, Fidelis Odedishemi, Ajibade, Diana Kavidia, Muyembe, and H K M, Mihiranga
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Environmental Engineering ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Abstract
The release of nutrients back into the water column due to macrophyte litter decay could offset the benefits of nutrient removal by hydrophytes within urban streams. However, the influence of this internal nutrient cycling on the overlying water quality and bacterial community structure is still an open question. Hence, litter decomposition trials using six hydrophytes, Typha latifolia (TL), Phragmites australis (PAU), Hydrilla verticillata (HV), Oenanthe javanica (OJ), Myriophyllum aquaticum (MA), and Potamogeton crispus (PC), were performed using the litterbag approach to mimic a 150-day plant litter decay in sediment-water systems. Field assessment using simple in/out mass balances and uptake by plant species was carried out to show the potential for phytoremediation and its mechanisms. Results from two years of monitoring (2020-2021) indicated mean total nitrogen (TN) retention efficiencies of 7.2-60.14 % and 9.5-55.6 % for total phosphorus (TP) in the studied vegetated urban streams. Nutrient retention efficiencies showed temporal variations, which depended on seasonal temperature. Mass balance analysis indicated that macrophyte assimilation, sediment adsorption, and microbial transformation accounted for 10.31-41.74 %, 0.84-3.00 %, and 6.92-48.24 % removal of the inlet TN loading, respectively. Hydrophyte detritus decay induced alterations in physicochemical parameters while significantly increasing the N and P levels in the overlying water and sediment. Decay rates varied among macrophytes in the order of HV (0.00436 g day
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- 2023
7. Impact of biochar amendment on antibiotic removal and ARGs accumulation in constructed wetlands for low C/N wastewater treatment
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Fidelis Odedishemi Ajibade, Wan-Xin Yin, Awoke Guadie, Temitope Fausat Ajibade, Ying Liu, Mathieu Nsenga Kumwimba, Wen-Zong Liu, Jing-Long Han, Hong-Cheng Wang, and Ai-Jie Wang
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General Chemical Engineering ,Environmental Chemistry ,General Chemistry ,Industrial and Manufacturing Engineering - Published
- 2023
8. Impact of Biochar Amended on Antibiotic Removal and Resistant Genes Accumulation in Constructed Wetlands for Low C/N Wastewater Treatment: Performance and Mechanism
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Fidelis Odedishemi Ajibade, Wanxin Yin, Awoke Guadie, Temitope Fausat Ajibade, Ying Liu, Mathieu Nsenga Kumwimba, Wen-Zong Liu, Jinglong Han, Hongcheng Wang, and Ai-Jie Wang
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
9. Performance of various fillers in ecological floating beds planted with Myriophyllum aquaticum treating municipal wastewater
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Mathieu Nsenga Kumwimba, Xuyong Li, Jinlou Huang, Diana Kavidia Muyembe, Mawuli Dzakpasu, and Edmond Sanganyado
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Environmental Engineering ,Nitrogen ,Environmental Chemistry ,Phosphorus ,Nutrients ,Wastewater ,Saxifragales ,Waste Disposal, Fluid ,Pollution ,Waste Management and Disposal ,Water Purification - Abstract
The performance of different suspended fillers (zeolite, drinking water treatment residual, biochar, woodchip and stereo-elastic packing) and their combinations in treating municipal wastewater in ecological floating beds (Eco-FBs) planted with Myriophyllum aquaticum was assessed. Six sets of enhanced Eco-FBs were developed to assess the individual and synergistic effects of combinations of the various fillers and microorganisms on nutrient elimination. The results demonstrated mean TN, NH
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- 2022
10. Roles of ammonia-oxidizing bacteria in improving metabolism and cometabolism of trace organic chemicals in biological wastewater treatment processes: A review
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Mathieu Nsenga Kumwimba and Fangang Meng
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Environmental Engineering ,010504 meteorology & atmospheric sciences ,Microorganism ,Heterotroph ,Cometabolism ,Wastewater ,010501 environmental sciences ,Waste Disposal, Fluid ,01 natural sciences ,chemistry.chemical_compound ,Ammonia ,Environmental Chemistry ,Organic Chemicals ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Pollutant ,Bacteria ,Chemistry ,Metabolism ,Biodegradation ,Pollution ,Biodegradation, Environmental ,Activated sludge ,Environmental chemistry ,Sewage treatment ,Oxidation-Reduction ,Water Pollutants, Chemical - Abstract
While there has been a significant recent improvement in the removal of pollutants in natural and engineered systems, trace organic chemicals (TrOCs) are posing a major threat to aquatic environments and human health. There is a critical need for developing potential strategies that aim at enhancing metabolism and/or cometabolism of these compounds. Recently, knowledge regarding biodegradation of TrOCs by ammonia-oxidizing bacteria (AOB) has been widely developed. This review aims to delineate an up-to-date version of the ecophysiology of AOB and outline current knowledge related to biodegradation efficiencies of the frequently reported TrOCs by AOB. The paper also provides an insight into biodegradation pathways by AOB and transformation products of these compounds and makes recommendations for future research of AOB. In brief, nitrifying WWTFs (wastewater treatment facilities) were superior in degrading most TrOCs than non-nitrifying WWTFs due to cometabolic biodegradation by the AOB. To fully understand and/or enhance the cometabolic biodegradation of TrOCs by AOB, recent molecular research has focused on numerous crucial factors including availability of the compounds to AOB, presence of growth substrate (NH4-N), redox potentials, microorganism diversity (AOB and heterotrophs), physicochemical properties and operational parameters of the WWTFs, molecular structure of target TrOCs and membrane-based technologies, may all significantly impact the cometabolic biodegradation of TrOCs. Still, further exploration is required to elucidate the mechanisms involved in biodegradation of TrOCs by AOB and the toxicity levels of formed products.
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- 2019
11. Nutrients retention of a series of small dam-impacted urban rivers in northern China
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Mathieu Nsenga Kumwimba, Linlin Bao, Zhishi Jie, Xuyong Li, Jinlou Huang, Wei wang, Xinzhu Li, Jingjun Su, Diana Kavidia Muyembe, Awoke Guide, and Mawuli Dzakpasu
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Process Chemistry and Technology ,Chemical Engineering (miscellaneous) ,Pollution ,Waste Management and Disposal - Published
- 2022
12. Nitrogen Retention in Mesocosm Sediments Received Rural Wastewater Associated with Microbial Community Response to Plant Species
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Jialiang Tang, Mathieu Nsenga Kumwimba, Dong Zhixin, Jianmei Li, Lei Hu, and Bo Zhu
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0301 basic medicine ,lcsh:Hydraulic engineering ,Geography, Planning and Development ,010501 environmental sciences ,Aquatic Science ,01 natural sciences ,Biochemistry ,Mesocosm ,03 medical and health sciences ,lcsh:Water supply for domestic and industrial purposes ,lcsh:TC1-978 ,Crenarchaeota ,rural domestic wastewater ,0105 earth and related environmental sciences ,Water Science and Technology ,lcsh:TD201-500 ,Typha ,biology ,Chemistry ,food and beverages ,Sediment ,biology.organism_classification ,030104 developmental biology ,Microbial population biology ,Wastewater ,Nitrifying bacteria ,Anammox ,Environmental chemistry ,eco-ditches ,microbial community - Abstract
Vegetated drainage ditches (eco-ditches) have drawn much attention in recent years for the ability to remediate diffuse contaminants in rural wastewater through sediment retention, plant uptake and interception, and microbial metabolic activities. However, the effect of plant species on microbial community structure and nitrogen (N) retention in ditch sediment remains poorly understood. In this study, mesocosm plastic drums were planted with eight plant species commonly found in ditches and nurtured with wastewater for 150 days. Sediment total nitrogen (TN) was greatly increased after 150-day nurturing with rural wastewater, from 296.03 mg∙kg&minus, 1 (Iris japonica Thunb) to 607.88 mg∙kg&minus, 1 (Acorus gramineusO). This study also presents the effect of different plant species on sediment microbial communities, thus providing insight into N removal mechanisms in eco-ditch. Fifty-eight differentially abundant taxa were identified, and sediment microbial community structure for no plant (CK), Acg, Canna indica (Cai), and Typha latifolia L. (Tyl) was primarily linked to sediment NH4+-N and TN. Extremely small proportions of ammonia oxidizing bacteria (AOB) and nitrifying bacteria were detected for all treatments, but large proportions of Crenarchaeota, which comprises the widely existent ammonium oxidized archaea (AOA), were found in CK, Acg and Cai. The abundance of Nitrosotalea from Crenarchaeota presented positive correlations with sediment NH4+-N contents and ammonia oxidation function predicted by Faprotax, indicating Nitrosotalea might be the dominant ammonium-oxidizing microbes in sediment samples. The probable NH4+-N removal pathway in wastewater sediment was through a combined effect of AOA, nitrifying bacteria, and anammox.
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- 2020
- Full Text
- View/download PDF
13. Nutrient dynamics and retention in a vegetated drainage ditch receiving nutrient-rich sewage at low temperatures
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Mathieu Nsenga Kumwimba, Tao Wang, Xuyong Li, Mawuli Dzakpasu, and Bo Zhu
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Environmental Engineering ,010504 meteorology & atmospheric sciences ,Nitrogen ,Ditch ,Sewage ,010501 environmental sciences ,01 natural sciences ,Water Purification ,Nutrient density ,Nutrient ,Environmental Chemistry ,Waste Management and Disposal ,Overwintering ,0105 earth and related environmental sciences ,geography ,geography.geographical_feature_category ,biology ,business.industry ,Myriophyllum aquaticum ,Temperature ,Phosphorus ,Nutrients ,biology.organism_classification ,Pollution ,Agronomy ,Acorus gramineus ,Environmental science ,Water quality ,business ,Water Pollutants, Chemical - Abstract
Vegetated agricultural drainage ditches (VDs) are a relatively new best management practice for pesticide and nutrient mitigation that is receiving increasing global interest. However, VDs are seldom used during winter due to considerable deterioration of pollutants reduction efficiencies driven by low-temperature effects. Limited knowledge on the internal loading of nutrient in VDs due to vegetation decomposition calls for further evaluation. Here, we assessed plants growth characteristics and nutrient dynamics in a field-scale VD receiving nutrient-rich sewage and planted with the overwintering plants: Acorus gramineus, Myriophyllum aquaticum and Iris sibirica. Water purification performance showed average TN, NH4-N, NO3-N, TP and PO4-P reduction efficiencies of 44, 46, 43, 52 and 46%, respectively, over the winter period. Maximum reduction rates of TN and TP were 5.31 and 0.34 g(-2) d(-1), respectively. Of the total nutrient removal by plants of 5.37 x 103 kg N y(-1) and 0.65 x 10(3) kg P y(-1) from the VD system, A. gramineus contributed 65.7% and 72.1%, respectively. Nonetheless, substantial amounts of N and P retained within the aboveground biomass were released into the water column as ditch plant shoots decayed to deteriorate the water quality. All three species, A. gramineus, M. aquaticum and I. sibirica demonstrated considerable nutrient accumulation during winter and facilitated nutrient retention in the VD system. Consequently, they can be considered effective overwintering species of choice in VDs for purifying nutrient-rich water and potentially appropriate for vulgarizing elsewhere, particularly throughout the winter season. (c) 2020 Elsevier B.V. All rights reserved.
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- 2020
14. Removal of non-point source pollutants from domestic sewage and agricultural runoff by vegetated drainage ditches (VDDs): Design, mechanism, management strategies, and future directions
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Lunda Ilunga, Fangang Meng, Matthew T. Moore, Mathieu Nsenga Kumwimba, Wang Tao, Bo Zhu, Tang Jia Liang, and Oluwayinka Iseyemi
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Environmental Engineering ,Ditch ,Sewage ,Environment ,010501 environmental sciences ,Waste Disposal, Fluid ,01 natural sciences ,Environmental protection ,Environmental Chemistry ,Pesticides ,Drainage ,Waste Management and Disposal ,Nonpoint source pollution ,0105 earth and related environmental sciences ,Pollutant ,geography ,geography.geographical_feature_category ,business.industry ,Agriculture ,Phosphorus ,04 agricultural and veterinary sciences ,Pollution ,Wastewater ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Terrestrial ecosystem ,Water quality ,business ,Water Pollutants, Chemical - Abstract
Domestic wastewater and agricultural runoff are increasingly viewed as major threats to both aquatic and terrestrial ecosystems due to the introduction of non-point source inorganic (e.g., nitrogen, phosphorus and metals) and organic (e.g., pesticides and pharmaceutical residues) pollutants. With rapid economic growth and social change in rural regions, it is important to examine the treatment systems in rural and remote areas for high efficiency, low running costs, and minimal maintenance in order to minimize its influence on water bodies and biodiversity. Recently, the use of vegetated drainage ditches (VDDs) has been employed in treatment of domestic sewage and agricultural runoff, but information on the performance of VDDs for treating these pollutants with various new management practices is still not sufficiently summarized. This paper aims to outline and review current knowledge related to the use of VDDs in mitigating these pollutants from domestic sewage and agricultural runoff. Literature analysis has suggested that further research should be carried out to improve ditch characteristics and management strategies inside ditches in order to ensure their effectiveness. Firstly, the reported major ditch characteristics with the most effect on pollutant removal processes (e.g., plant species, weirs, biofilms, and substrates selection) were summarized. The second focus concerns the function of ditch characteristics in VDDs for pollutant removal and identification of possible removal mechanisms involved. Thirdly, we examined factors to consider for establishing appropriate management strategies within ditches and how these could influence the whole ditch design process. The current review promotes areas where future research is needed and highlights clear and sufficient evidence regarding performance and application of this overlooked ditch system to reduce pollutants.
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- 2018
15. Potential of invasive watermilfoil (Myriophyllum spp.) to remediate eutrophic waterbodies with organic and inorganic pollutants
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Mawuli Dzakpasu, Mathieu Nsenga Kumwimba, and Xuyong Li
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Environmental Engineering ,0208 environmental biotechnology ,Biodiversity ,02 engineering and technology ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,Reuse ,01 natural sciences ,Ecosystem services ,Environmental protection ,Biomass ,Waste Management and Disposal ,Restoration ecology ,Ecosystem ,0105 earth and related environmental sciences ,Resource recovery ,Pollutant ,Myriophyllum ,biology ,business.industry ,Agriculture ,General Medicine ,biology.organism_classification ,020801 environmental engineering ,Environmental science ,Environmental Pollutants ,business - Abstract
Watermilfoil (Myriophyllum) is one of the world's most troublesome invasive aquatic weeds. Although current management practices may inhibit its expansion, it also impacts not only the quality of water but habitat deterioration. Therefore, the need for developing highly efficient and low-cost biotechnologies with resource recovery into the agriculture field as a complementary management strategy cannot be overstated. Here, we reviewe the scientific/grey literature to offer readers a precise and panoramic view of the invasive watermilfoil ecology, regional problems, impacts, ecosystem services, and management. In this regard, an in-depth review aimed to assess the potential for reducing non-point source inorganic and organic pollutants using invasive watermilfoil, with the sustainable approaches, while offering other services and mitigating ecological trade-offs is presented. Global distributions, growth, and current progress on the management and utilization of invasive watermilfoil biomass are summarized to develop the aim, which is to convey challenges during the implementation of large-scale weed use. In short, pollutant assimilation in plant and bacterial communities linked to this weed considerably contribute to the reduction and degradation of pollutants from both natural and artificial systems. Although several considerations in recycling and reusing biomass need to be considered, the potential reuse of the harvested material for livestock feed, compost and direct use in farming systems offer an additional strategy to achieve sustainable ecosystem restoration. Further research and development may focus on a more detailed economic modeling approach that integrates the costs (worker's wage, harvesting, transportation, and energy consumption), legal and regulatory barriers, health risks and ecosystem service benefits (biodiversity improvement, and pollutant removal) to holistically evaluate the economic, environmental, and societal value of reusing and recycling this waste material.
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- 2019
16. Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed
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Mathieu Nsenga Kumwimba, H.K.M. Mihiranga, Wei Wang, Yan Jiang, Xin Bao, Koshila De Silva, S. P. Nissanka, and Xuyong Li
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Hydrology ,geography ,Environmental Engineering ,Watershed ,geography.geographical_feature_category ,Nitrogen ,Drainage basin ,Sediment ,Phosphorus ,Storm ,Structural basin ,Pollution ,Rivers ,Environmental Chemistry ,Environmental science ,Subsurface flow ,Surface runoff ,Waste Management and Disposal ,Water Pollutants, Chemical ,Environmental Monitoring ,Total suspended solids - Abstract
Seasonal rainfall events reinforce the link between terrestrial and fluvial domains and are crucial for assessing hydrological control over riverine nutrient dynamics and pollutant source behaviors, especially in a semi-arid watershed. Taking the Qingshuihe river basin, a semi-arid mountainous basin in China, as an example, this paper investigated storm effects on riverine nitrogen (N) and phosphorus (P) dynamics (i.e. concentration, load, and composition changes) through continuous sampling of four storm events of the 2019 rainy season, including one small storm, two moderate storms, and a large storm. Pollutant sources and transport pathways were then examined over the storm sequence via hysteresis analysis. The results revealed a strong linkage between N/P dynamics and hydrological processes. Storm runoff caused a 6-fold increase in particulate-P (PP) and a 4-fold increase in ammonia-N (NH4-N) fluxes through four storms (most sensitive nutrients to storms). On average, PP shared 86% of P exports, and nitrate-N (NO3-N) contributed 79% of N exports. PP and NH4-N were delivered primarily from overland sources and transported by surface runoff. Nonetheless, mobilization of channel sediment reserves was also an important way of PP supply during storms. The results suggested groundwater as the principal NO3-N source in the watershed, and subsurface flow was important for NO3-N and total dissolved-P (TDP) delivery during storms. The large storm (>20 mm) often registered the highest N/P load exports. However, there were other influencing factors/processes on stormflow N/P dynamics in the semi-arid watershed, which complicate/override the effects of different storm magnitudes. Total suspended solids (TSS)/PP source availability and inter- and intra-storm export trends influenced P behaviors through storms. Moreover, impacts of mobilization processes on NO3-N behavior appeared over the storm sequence. These findings enhance our understanding of storm events induced N/P exports in water-scarce regions and provide references for water quality predictions and control in flood seasons.
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- 2021
17. Can vegetated drainage ditches be effective in a similar way as constructed wetlands? Heavy metal and nutrient standing stock by ditch plant species
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Tao Wang, Matthew T. Moore, Mathieu Nsenga Kumwimba, Bo Zhu, and Xuyong Li
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geography ,Biomass (ecology) ,Environmental Engineering ,geography.geographical_feature_category ,business.industry ,Ditch ,Sewage ,Wetland ,04 agricultural and veterinary sciences ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,01 natural sciences ,Nutrient ,Agronomy ,Wastewater ,Aquatic plant ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Ecosystem ,business ,0105 earth and related environmental sciences ,Nature and Landscape Conservation - Abstract
Agricultural runoff impacts rivers and lakes on a global scale, while in developing countries (e.g., China), rural domestic wastewater is often an additional source of pollution. Scholars and policy makers are now promoting the use of agricultural vegetated ditches (VDs) as a potential supplemental management practices for nutrients and pesticide reduction from agricultural sources; however, information on the efficacy of these systems for the treatment of rural wastewater loaded with nutrients and heavy metal(loid)s (HMLs) removal and standing stock (SS) in aquatic plants growing there is rare or unknown. These shortcomings in our understanding of these systems must be addressed if they are going to serve further as an effective tool for purifying rural domestic sewage laden with concentrations of HMLs. To address this knowledge gap, the present study deals with SS of ten HMLs in ten plant species growing in a VD receiving raw rural domestic wastewater, with the intention to revealing an appropriate period for ditch plant harvesting to maximize HM removal. Mean reduction efficiencies amount to TN (60.6%), NH4-N (63.3%), NO3-N (48.1%), TP (58.5%) and PO4-P (51.9%), with favorable treatment performance during the summer season. Concentrations of nutrients typically declined gradually with distance along the length of the VD. Furthermore, the annual average reduction amounted to Ni (50.6%), Cu (56.1%), Cr (63.3%), Zn (79.3%), Cd (67.5%), Pb (80.1%), As (60.3%), Fe (52.6%), Al (19.8%), and Mn (24.3%). Plant uptake and sediment retention were the major contributors for nutrient mitigation within the vegetated ditches, with subsequent bacterial interaction and transformation of pollutants. Accumulation of HMLs varied among species and plant parts. Overall, SSs of most HMLs in plant species were greater in either stems or roots than leaves, with maximum values recorded in SSs of Al, Fe, and Mn. Based on the seasonal fluctuation of the accumulated HMLs in different plant species, the approach of harvesting plant biomass in order to effectively target HMLs in August or early September is recommended. Overall, reported results suggest that VD is an effective ecosystem to mitigate HMLs and nutrients from raw rural domestic wastewater in a similar way as constructed wetlands, noting the potential incorporation into local best management practices.
- Published
- 2021
18. Sequential detention pond-biogeochemical barrier-free water surface wetland system for effluent purification and river eutrophication control
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Jingjun Su, Wei Wang, Li Xinzhu, Xuyong Li, Zhishi Jie, Linlin Bao, Mathieu Nsenga Kumwimba, and Mawuli Dzakpasu
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Biogeochemical cycle ,geography ,geography.geographical_feature_category ,Process Chemistry and Technology ,Environmental engineering ,Wetland ,Sedimentation ,Nutrient ,Constructed wetland ,Environmental science ,Sewage treatment ,Safety, Risk, Reliability and Quality ,Eutrophication ,Waste Management and Disposal ,Effluent ,Biotechnology - Abstract
Discharge of phosphorus (e.g., PO4-P) and nitrogen (NO3-N) from the wastewater treatment facility (WWTF) effluent even at low occurrence (e.g., μg PO4-P L−1) could lead to eutrophication of receiving environments. Zhangjiakou city will host the international winter multi-sport event in 2022, which would probably yield a large amount of domestic WW and their associated contaminants in the water systems. To reveal the feasibility of an integrated surface flow constructed wetland (ISFCW) system for the purification of WWTF effluent, a field-scale ISFCW system was applied and operated in Zhangjiakou city. The ISFCW system consisted of a vegetated sedimentation pond (VSP) section followed by a biogeochemical barrier (BGB), and an SFCW. The purification performance of each purification component was monitored weekly over twelve months in terms of nutrient (N and P) removal. With the application of the ISFCW system, a total of 48.7, 59.4, 50.0, 54.9, and 60.2 % removal of TN, NH4-N, NO3-N, TP, and PO4-P was achieved in the summer period. Further analysis demonstrated that the contributions of VSP, BGB and FTW to all analyzed nutrient removal were 3–78 %. The key removal processes appeared to be biological and physicochemical pathways, and the integration of the VSP, BGB and SFCW enhanced the purification capacity of the system. Overall, the ISFCW system was effective at reducing nutrients from WWTF effluent and could consequently be used locally and in other similar mountain-river systems. Additional optimization of operating conditions could result in an enhanced reduction of nutrients.
- Published
- 2021
19. Large-scale hybrid accidental urban wetland for polluted river purification in northern China: Evidence and implications for urban river management
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Jingjun Su, Mathieu Nsenga Kumwimba, Xinzhu Li, Linlin Bao, H.K.M. Mihiranga, L.H.D.K.U. De Silva, Xuyong Li, and Wei Wang
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Pollutant ,geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Detention basin ,Environmental engineering ,Soil Science ,Wetland ,Plant Science ,010501 environmental sciences ,Sedimentation ,01 natural sciences ,Nutrient ,Weir ,Environmental science ,Eutrophication ,Effluent ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Hybrid accidental urban wetlands (HAUWs) are expected to be a potential low-cost and highly efficient alternative means of minimizing pollutant loads from municipal areas as compared to the single-stage system being used. These unexpected HAUWs are created not through deliberate restoration, but as a result of water infrastructure decisions by local government. However, information on the long-term purification efficiency of large-scale HAUW improving eutrophic urban rivers is largely unexplored. An in-situ HAUW system consisting of a rubber dam, detention pond, accidental urban wetland, and overflow weir was evaluated at the field-scale for the purification of a eutrophic urban river in Zhangjiakou City, Hebei Province. The results for seven months of operation demonstrated that the effluent TP and NH4-N in the HAUW system could comply with the Grade III of Chinese National Surface Water Quality Standards. Average removal efficiencies for TN, NH4-N, NO3-N, TP, and PO4-P in the summer–autumn period of 52.6, 65,8, 56.6, 51.4, 58.2 and 88.3%, respectively, were recorded. These removal efficiencies were 59.4, 61.5, 65.6, 57.1, 59.4 and 65.7% higher than the respective values in the spring period. Furthermore, removal rates of nutrients were highly sensitive to temperature and showed seasonal trends. Further analysis showed that, with the application of the HAUW system, a total of 92.1, 69.5, 57.3, 37.8, 33.2, 12.4, 14.5, 7.3, 3.4% removal of Al, Mn, Cd, Pb, Zn, Ni, Fe, Ni, and As was achieved. Mean removal rates of TN, NH4-N, NO3-N, TP, TDP, PO4-P in the summer–autumn period were 2- 5 times higher than in those recorded in the early spring period. These results suggest that a variety of contaminant elimination mechanisms were offered by the HAUW, including enhanced hydraulic resistance, sedimentation, plant assimilation, microbial biofilm growth on roots’ surface and the HAUW design. Overall, this study demonstrated that the monitored HAUW could be another feature of the urban landscape that could help minimize pollutant loading to surface urban water bodies. This function is especially true in warm periods, in a similar way as natural wetlands or purposely built constructed wetlands. Nonetheless, managing these accidental treatment systems to maximize pollutant dissipation in the long-term would necessitate appropriate management strategies.
- Published
- 2021
20. Plant soaking decomposition as well as nitrogen and phosphorous release in the water-level fluctuation zone of the Three Gorges Reservoir
- Author
-
Mathieu Nsenga Kumwimba, Liwei Xiao, Bo Zhu, and Shiwei Jiang
- Subjects
China ,Nutrient cycle ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Nitrogen ,chemistry.chemical_element ,010501 environmental sciences ,01 natural sciences ,Nutrient ,Botany ,Environmental Chemistry ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Total organic carbon ,biology ,Chemistry ,Phosphorus ,Water ,Plants ,Cynodon dactylon ,biology.organism_classification ,Pollution ,Decomposition ,Floods ,Horticulture ,Eutrophication - Abstract
The operating scheme of the Three Gorges Reservoir results in a summer drought in the water-level fluctuation zone during which plants grow vigorously. In the winter inundation season, soaking plants may decompose and release nutrients resulting in water quality deterioration. This study quantifies the contributions of the underwater decomposition of nine dominant plant species in the water-level fluctuation zone to nutrient release. The in-situ litterbag technique was used to study for soaking decomposition over 200days. All soaking plant species decomposed rapidly at an average rate of 1.99±0.33%d-1 in the early stage of soaking (0 to 30days) and at an average rate of only 0.07±0.04%d-1 in the later stage (30 to 200days). After 200days of soaking, the nine plant species released an average of 312.40±39.97gkg-1 organic carbon, 6.71±4.29gkg-1 of nitrogen and 2.25±1.25gkg-1 of phosphorus. A positive relationship was found between soaking plant decomposition rates and initial C/N ratios of 25 to 50, and a negative relationship where the C/N ratios were between 50 and 100. The amounts of total nitrogen or total phosphorus released were significantly negatively correlated with the initial C/N or C/P ratios of the plants. Among the studied plant species, Xanthium sibiricum Patr ex Widder showed high level of nutrient release via soaking decomposition. In contrast, Cynodon dactylon (Linn.) Pers. and Polygonum hydropiper exhibited low levels of nutrient release and are recommended as suitable species for the ecological restoration of the water-level fluctuation zone. Our results demonstrate that after 200days of soaking plant decomposition, the loadings of total organic carbon, nitrogen, and phosphorus in the water-level fluctuation zone of the Three Gorges Reservoir were 2942.1, 81.1, and 24.7kgha-1, respectively and therefore could potentially damage the aquatic environment of the reservoir.
- Published
- 2017
21. Nutrient distribution and risk assessment in drainage ditches with different surrounding land uses
- Author
-
Tao Wang, Mathieu Nsenga Kumwimba, Wang Xiaoguo, Jialiang Tang, and Bo Zhu
- Subjects
Hydrology ,geography ,geography.geographical_feature_category ,Phosphorus ,Ditch ,Soil Science ,chemistry.chemical_element ,Sediment ,04 agricultural and veterinary sciences ,Vegetation ,010501 environmental sciences ,engineering.material ,01 natural sciences ,Nutrient ,Agronomy ,chemistry ,040103 agronomy & agriculture ,engineering ,0401 agriculture, forestry, and fisheries ,Environmental science ,Fertilizer ,Drainage ,Water pollution ,Agronomy and Crop Science ,0105 earth and related environmental sciences - Abstract
Due to lack of ditch maintenance, many ditches in the upper reaches of the Yangtze River are strongly affected by nutrient over-enrichment. Accordingly, we conducted surveys of nutrient concentrations in ditchwater and sediment in the hilly area of the central Sichuan Basin to investigate the spatiotemporal variations of nutrient concentrations and to promote the restoration of ditches for ecological functions. The results showed that the mean total nitrogen, particulate nitrogen, nitrate nitrogen, ammonia nitrogen, and total phosphorus values in ditchwater were 4.80, 1.09, 0.94, 1.09, and 0.18 mg/L, respectively. The mean concentrations of total nitrogen, nitrate nitrogen, ammonia nitrogen, and total phosphorus in ditch sediment were 1.58 g/kg, 2.62 mg/kg, 1.54 mg/kg, and 6.95 g/kg, respectively. Higher total nitrogen concentrations in ditchwater occurred in western areas, while higher total phosphorus concentrations occurred in central areas. Seasonally, we measured higher nitrogen and phosphorus concentrations in ditchwater close to agricultural areas during the rainy season, while the opposite effect was true for residential areas. Although nutrient concentrations in ditchwater could be affected by both surrounding land uses and ditch water levels, land use was critical. Moreover, nitrogen and phosphorus concentrations were significantly higher in the ditchwater near residential areas when compared to paddy or sloping cropland ditches. However, we found no significant differences between the nutrient contents of sediments in ditches surrounded by different land uses. Our results indicate that water pollution control initiatives in residential areas would be the most critical factor in combating ditchwater and sediment pollution in this region. Therefore, efforts to restore the ecological functions of drainage ditches should take into account rural township sewage management, fertilizer reduction, and especially ditch vegetation restoration.
- Published
- 2017
22. Nutrient removal in a trapezoidal vegetated drainage ditch used to treat primary domestic sewage in a small catchment of the upper Yangtze River
- Author
-
Mawuli Dzakpasu, Lunda Ilunga, Tao Wang, Diana Kavidia Muyembe, Mathieu Nsenga Kumwimba, and Bo Zhu
- Subjects
Environmental Engineering ,Ditch ,Drainage basin ,Sewage ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,01 natural sciences ,Nutrient ,0105 earth and related environmental sciences ,Water Science and Technology ,Hydrology ,geography ,geography.geographical_feature_category ,business.industry ,Environmental engineering ,Sediment ,04 agricultural and veterinary sciences ,Total dissolved solids ,Pollution ,cardiovascular system ,040103 agronomy & agriculture ,Yangtze river ,0401 agriculture, forestry, and fisheries ,Environmental science ,business ,Drainage ditch - Abstract
A trapezoidal constructed ditch (TCD) of 300 m length and 2.2 m width was designed and built in the downstream section of the upper Yangtze River for in situ treatment of primary domestic sewage. The removal efficiencies of TN, NH4-N, NO3-N, TP and PO4-P from the TCD were approximately 61, 63, 48, 58 and 51%, respectively. The concentrations of TN, NH4-N, NO3-N, TP and PO4-P showed a decreasing trend with increasing distance downstream. Plant assimilation and sediment retention were the key mechanisms for N and P removal within the TCD, with subsequent microbial uptake and transformation of the nutrients. The TCD outlet showed significantly higher dissolved oxygen (DO) concentrations and lower values of electrical conductivity and total dissolved solids compared to the influent. Results of this study highlight the potential of TCD to mitigate nutrients from primary domestic sewage transported downstream and could be incorporated into local best management practices.
- Published
- 2016
23. Anammox-based processes: How far have we come and what work remains? A review by bibliometric analysis
- Author
-
Tommaso Lotti, Mathieu Nsenga Kumwimba, Fidèle Suanon, Engin Şenel, and Xuyong Li
- Subjects
Environmental Engineering ,Bibliometric analysis ,Computer science ,Nitrogen ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,Bibliometrics ,01 natural sciences ,Nitrogen removal ,Qualitative analysis ,Bioreactors ,Ammonium Compounds ,Sodium Glutamate ,Environmental Chemistry ,0105 earth and related environmental sciences ,Sustainable development ,Bacteria ,Sewage ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,Pollution ,020801 environmental engineering ,Work (electrical) ,Anammox ,Biochemical engineering ,Oxidation-Reduction ,Water Pollutants, Chemical - Abstract
Nitrogen contamination remains a severe environmental problem and a major threat to sustainable development worldwide. A systematic analysis of the literature indicates that the partial nitritation-anammox (PN/AMX) process is still actively studied as a viable option for energy-efficient and feasible technology for the sustainable treatment of N- rich wastewaters, since its initial discovery in 1990. Notably, the mainstream PN/AMX process application remains the most challenging bottleneck in AMX technology and fascinates the world's attention in AMX studies. This paper discusses the recent trends and developments of PN/AMX research and analyzes the results of recent years of research on the PN/AMX from lab-to full-scale applications. The findings would deeply improve our understanding of the major challenges under mainstream conditions and next-stage research on the PN/AMX process. A great deal of efforts has been made in the process engineering, PN/AMX bacteria populations, predictive modeling, and the full-scale implementations during the past 22 years. A series of new and excellent experimental findings at lab, pilot and full-scale levels including good nitrogen removal performance even under low temperature (15-10 °C) around the world were achieved. To date, pilot- and full-scale PN/AMX have been successfully used to treat different types of industrial sewage, including black wastewater, sludge digester liquids, landfill leachate, monosodium glutamate wastewater, etc. Supplementing the qualitative analysis, this review also provides a quantitative bibliometrics study and evaluates global perspectives on PN/AMX research published during the past 22 years. Finally, general trends in the development of PN/AMX research are summarized with the aim of conveying potential future trajectories. The current review offers a valuable orientation and global overview for scientists, engineers, readers and decision makers presently focusing on PN/AMX processes.
- Published
- 2019
24. How to enhance the purification performance of traditional floating treatment wetlands (FTWs) at low temperatures: Strengthening strategies
- Author
-
Ammara Batool, Mathieu Nsenga Kumwimba, and Xuyong Li
- Subjects
Pollution ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Nitrogen ,media_common.quotation_subject ,Wetland ,Portable water purification ,010501 environmental sciences ,Waste Disposal, Fluid ,01 natural sciences ,Water Purification ,Nutrient ,Water column ,Humans ,Environmental Chemistry ,Waste Management and Disposal ,0105 earth and related environmental sciences ,media_common ,Pollutant ,geography ,geography.geographical_feature_category ,Temperature ,Environmental engineering ,Macrophyte ,Plant Breeding ,Biodegradation, Environmental ,Wetlands ,Environmental science ,Water quality ,Water Pollutants, Chemical - Abstract
Pollution of freshwaters poses a major threat to water quality and human health and thus, nutrients have been targeted for mitigation. One such control measure is floating treatment wetlands (FTWs), which are designed to employ vigorous macrophytes above the water surface and extensive plant root system below the water surface to increase plant uptake of nutrients. The efficacy of FTWs in purifying different water systems has been widely studied and reviewed, but most studies have been performed in warm periods when FTW macrophytes are actively growing. In low-temperature conditions, the metabolic processes of macrophytes and microbial activity are usually weakened or reduced by the winter months and are not actively assimilating pollutants. These circumstances hamper the purification ability of FTWs to perform as designed. Furthermore, decayed macrophytes could release pollutants into the water column. Hence, this paper aimed to systematically summarize strategies for use of enhanced FTWs in eutrophic water improvement at low temperature and identify future directions to be addressed in intensifying FTW performance in low-temperature conditions. Low-temperature FTW show variable nutrient removal efficiencies ranging from 22% to 98%. Current amendments to enhance FTW purification performance, ranging from direct strategies for internal components to indirect enhancement of external operation environments encourage the FTW efficacy to some extent. However, the sustainability and sufficiency of water purification efficiency remain a great challenge. Keeping in mind the need for optimizing the FTW components and dealing with high organic and inorganic chemicals, future research should be carried out at the large field-scale and focus on macrophyte- benthos- microorganism synergistic enhancement, breeding of cold-tolerant macrophytes, and combination of FTWs with many strategies, as well as rational design and operational approaches under cold conditions.
- Published
- 2021
25. Distribution and risk assessment of metals and arsenic contamination in man-made ditch sediments with different land use types
- Author
-
Tao Wang, Diana Kavidia Muyembe, Mathieu Nsenga Kumwimba, and Bo Zhu
- Subjects
Geologic Sediments ,010504 meteorology & atmospheric sciences ,Health, Toxicology and Mutagenesis ,Ditch ,chemistry.chemical_element ,010501 environmental sciences ,Risk Assessment ,01 natural sciences ,Arsenic ,Metals, Heavy ,Water Pollution, Chemical ,Humans ,Environmental Chemistry ,Human Activities ,0105 earth and related environmental sciences ,Hydrology ,geography ,geography.geographical_feature_category ,Ecology ,Land use ,Sediment ,General Medicine ,Sedimentation ,Pollution ,Arsenic contamination of groundwater ,chemistry ,Multivariate Analysis ,Erosion ,Environmental science ,Metalloid ,Water Pollutants, Chemical ,Environmental Monitoring - Abstract
Ditches are subjected to a large input of nutrients, trace metals, and arsenic and the enhancement of sedimentation due to human activities. However, the influence of different types of land uses on the distribution and associated environmental risk of metals and arsenic in the Red purple Sichuan Basin remains largely unclear, which is needed for water management. This study was carried out to characterize metal/metalloid status in ditch sediments from different land uses. A total of 68 surface sediment samples (0–5 cm) were collected from open ditches distributed in different land use types, i.e., cultivated ditches (CD), barren land ditches (BLD), roadside ditches (RSD), and residential ditches (RD), within the Sichuan Basin. Mean concentrations of Cr, Ni, Cu, Zn, Cd, Pb, and Mn in both RD and RSD were above the soil background values of Sichuan Basin, but Cd in ditch sediments of the basin posed considerable ecological risk to the environment. Overall, metals/metalloid (except Pb) decreased in the following order of RD > RSD > BLD > CD. Of the different land use types in the hilly region, residential and roadside land uses were likely to adverse effects on aquatic life. Multivariate statistical analysis showed that Mn, As, Cu, Ni, Zn, Fe, and Al were mainly influenced by natural weathering (erosion), while Pb might come from heavy vehicular traffic. The degree of contamination (Md), enrichment factor (EF), and the geo-accumulation index (Igeo) showed that Cd causes strong sediment pollution in the basin. Sediment quality guidelines SQG-Q values displayed that metals and arsenic created medium-low potential of adverse biological effects. These results provide baseline information on the metals and arsenic pollution in the Sichuan Basin. Awareness of land use type contributions to metals and arsenic requires that these man-made ditches be considered for their mitigation of pollutants in this region.
- Published
- 2016
26. Assessing the influence of different plant species in drainage ditches on mitigation of non-point source pollutants (N, P, and sediments) in the Purple Sichuan Basin
- Author
-
Diana Kavidia Muyembe, Bo Zhu, and Mathieu Nsenga Kumwimba
- Subjects
food.ingredient ,Nitrogen ,Ditch ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,01 natural sciences ,Soil ,Nutrient ,food ,Oenanthe javanica ,Botany ,Ecotoxicology ,Water Pollutants ,Drainage ,0105 earth and related environmental sciences ,General Environmental Science ,Pollutant ,geography ,geography.geographical_feature_category ,Aquatic ecosystem ,Drainage, Sanitary ,Water Pollution ,Phosphorus ,04 agricultural and veterinary sciences ,General Medicine ,Plants ,Pollution ,Phytoremediation ,Biodegradation, Environmental ,Agronomy ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Environmental Monitoring - Abstract
Three different types of ditches, each 300 m in length, were employed in this study. One vegetated constructed ditch (VCD), three natural vegetated soil ditches (NVSD), and three constructed ditches left unvegetated (UCD) as controls were investigated using simple in/out mass balances and uptake by plant species with a potential for phytoremediation and their mechanisms. Significant differences in the ditches were observed, suggesting the importance of plant species in nutrient mitigation. The removal rates of TN (total nitrogen) and TP (total phosphorus) were 64.28 and 58.02, 31.16 and 27.49, and 3.91 and 2.97%, respectively, in the VCD, NVSD, and UCD. Canna indica (45.12 g m−2) and Oenanthe javanica (21.48 g m−2) had the highest total N and P storage in the VCD and NVSD. Furthermore, species C. indica possessed the highest annual N and P uptake in the VCD (216.59 kg N/ha/yr and 30.73 kg P/ha/yr). In the NVSD, species O. javanica had the greatest annual N and P uptake (96.66 kg N/ha/yr and 7.94 kg P/ha/yr). Both VCD and NVSD were found to have a reasonably good outcome compared to UCD. Retention of nutrients by ditch sediments was probably the major attenuation mechanism, with subsequent plant uptake and microbial nitrification–denitrification of the nutrients as secondary removal mechanisms. Results of this study highlight the importance of taking actions for establishment of appropriate plant species inside the ditches in order to enhance its direct and indirect roles and maximize purification rate in aquatic environments.
- Published
- 2017
27. Growth characteristics and nutrient removal capability of eco-ditch plants in mesocosm sediment receiving primary domestic wastewater
- Author
-
Diana Kavidia Muyembe, Mawuli Dzakpasu, Bo Zhu, and Mathieu Nsenga Kumwimba
- Subjects
Eichhornia crassipes ,Nitrogen ,Health, Toxicology and Mutagenesis ,ved/biology.organism_classification_rank.species ,Biomass ,Sewage ,010501 environmental sciences ,Wastewater ,Typhaceae ,01 natural sciences ,Mesocosm ,Nutrient ,Rivers ,Terrestrial plant ,Ammonium Compounds ,Environmental Chemistry ,Araceae ,Cyperus ,0105 earth and related environmental sciences ,Nitrates ,biology ,ved/biology ,business.industry ,Canna ,Environmental engineering ,Phosphorus ,04 agricultural and veterinary sciences ,General Medicine ,Plants ,biology.organism_classification ,Pollution ,Cyperus alternifolius ,Agronomy ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,business - Abstract
Eco-ditches are being explored to maximize their capability of capturing pollutants and mitigate any harmful side effects in rivers. In this study, mesocosm plastic drum sediment and field experiments were set up to screen 18 plant species found in ditches and identify those with potential for high biomass production and nutrients removal. Terrestrial plants grown in the mesocosm system were shown to be able to acclimate to aquatic conditions and to survive in primary domestic sewage. About 73-95% increase in plant biomass was recorded. Removal efficiencies for total nitrogen, total phosphorus, and ammonium-nitrogen from the sewage of 72-99%, 64-99%, and 75-100%, respectively, were recorded. Furthermore, complete removal of the applied nitrate-nitrogen load was achieved in mesocosm systems. Findings also show that all species, but especially Acorus calamus, Canna indica, Canna lily, Cyperus alternifolius, Colocasia gigantea, Eichhornia crassipes, Iris sibirica, and Typha latifolia had the highest efficiencies for nitrogen and phosphorous removal. The N and P mass balance analysis demonstrated that plant uptake and sediment N and P accumulation accounted for 41-86% and 18-49% of the total influent TN and TP loads, respectively. In addition, the amounts of nitrogen and phosphorous uptake by these plant species were influenced significantly by biomass. The field-culture experiment further identified Canna indica followed by Cyperus alternifolius as the most promising for high biomass production and nutrients uptake. Therefore, these plants may be recommended for extensive use in treating highly eutrophicated rivers. Outcomes of this work can be useful for model design specifications in eco-ditch mitigation of sewage pollution.
- Published
- 2017
28. Assessing Nutrient, Biomass, and Sediment Transport of Drainage Ditches in the Three Gorges Reservoir Area
- Author
-
Bo Zhu, Dong Zhixin, Jialiang Tang, Diana Kavidia Muyembe, Tao Wang, Mathieu Nsenga Kumwimba, and Liwei Xiao
- Subjects
Hydrology ,geography ,geography.geographical_feature_category ,media_common.quotation_subject ,fungi ,Ditch ,Environmental engineering ,Septic tank ,Wetland ,04 agricultural and veterinary sciences ,010501 environmental sciences ,01 natural sciences ,Pollution ,Nutrient ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental Chemistry ,Environmental science ,Water quality ,Drainage ,Eutrophication ,Well drainage ,0105 earth and related environmental sciences ,Water Science and Technology ,media_common - Abstract
The contributions of drainage ditches to the accelerated eutrophication of rivers have rarely been assessed, especially for the Three Gorges Reservoir (TGR) drainage ditches. Forty drainage ditches in the TGR from multiple land use types were extensively investigated for ten parameters of water quality. The results showed that the concentrations of total nitrogen (TN) and total phosphorus (TP) in the TGR drainage ditches were generally far higher than the internationally recognized eutrophication threshold. Based on this study, both ditch water and sediments from residential land and roadside land had the highest concentrations of nutrients. Possible sources of these nutrients include sewage water and septic tank overflow. Forestland had significantly lower concentrations of nutrients. Residential ditches had higher values of electrical conductivity (EC) and total dissolved solid (TDS) values and lower dissolved oxygen (DO) concentrations. Forestland had lower values of EC and TDS values and higher DO concentrations. The results indicate that the nutrients that have accumulated in the sediments have significant impacts on the water quality in adjacent ditches. A long-term plan must be developed to more strictly control the external loading of nutrients from surrounding land. Action plans to promote the growth of wetland plants in drainage ditches are important for increasing agrochemical retention in the TGR drainage ditches. TGR drainage ditches from residential zones must be actively managed by cleaning and sediment removal to control the risk of nutrients being released into the reservoir.
- Published
- 2016
29. Long-term impact of primary domestic sewage on metal/loid accumulation in drainage ditch sediments, plants and water: Implications for phytoremediation and restoration
- Author
-
Mawuli Dzakpasu, Diana Kavidia Muyembe, Mathieu Nsenga Kumwimba, Fidèle Suanon, and Bo Zhu
- Subjects
China ,Geologic Sediments ,Environmental Engineering ,0208 environmental biotechnology ,Ditch ,Sewage ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Metal ,Soil ,Metals, Heavy ,Environmental Chemistry ,Waste Management and Disposal ,Environmental Restoration and Remediation ,0105 earth and related environmental sciences ,geography ,geography.geographical_feature_category ,business.industry ,Environmental engineering ,Sediment ,Water ,Plants ,Pollution ,020801 environmental engineering ,Phytoremediation ,Biodegradation, Environmental ,visual_art ,Environmental chemistry ,visual_art.visual_art_medium ,Environmental science ,Metalloid ,business ,Drainage ditch - Abstract
We evaluate the long-term performance of a vegetated drainage ditch (VDD) treating domestic sewage with respect to heavy metal/metalloid (HM/M) accumulation in sediments, plants and water. VDD sediment contained significantly higher macro and trace elements compared to an agricultural ditch (AD) sediment. However, concentrations of HM/Ms in VDD sediment were below the ranges considered toxic to plants. Most HM/Ms were efficiently removed in the VDD, whereby removal efficiencies varied between 11% for Al and 89% for K. Accumulation of HM/Ms varied among species and plant parts, although sequestration by plants represents only a small proportion (1%) of the inflow load. Accumulation of Al, As, Cd, Pb, Cr, Fe and Ni in VDD plants were mostly distributed in the roots, indicating an exclusive strategy for metal tolerance. The opposite was found for Zn, Cu, K, Ca, P, K, Na, N and Mg, which were accumulated either in the stems or leaves. Overall, concentrations of metals in sediment showed significant positive correlations with those in ditch plants. None of the studied species were identified as metal hyper-accumulators (i.e.10,000mgkg
- Published
- 2016
30. Uptake and Release of Sequestered Nutrient in Subtropical Monsoon Ecological Ditch Plant Species
- Author
-
Diana Kavidia Muyembe, Bo Zhu, Mathieu Nsenga Kumwimba, and Mawuli Dzakpasu
- Subjects
Environmental Engineering ,Ditch ,chemistry.chemical_element ,010501 environmental sciences ,01 natural sciences ,Mesocosm ,Nutrient ,Environmental Chemistry ,0105 earth and related environmental sciences ,Water Science and Technology ,Biomass (ecology) ,geography ,geography.geographical_feature_category ,Ecology ,Ecological Modeling ,Phosphorus ,04 agricultural and veterinary sciences ,Vegetation ,Pollution ,Agronomy ,chemistry ,040103 agronomy & agriculture ,Litter ,0401 agriculture, forestry, and fisheries ,Environmental science ,Eutrophication - Abstract
Ecological ditches have demonstrated the ability to filter and control nutrient transport to rivers. Few studies, however, have examined the internal loading of nitrogen (N) and phosphorus (P) in these systems due to vegetation decomposition. Most often, this concept is overlooked during evaluation of the nutrient removal rate of the ditches. Thus, the litter bag technique was used to analyze nutrient release to surface water during these processes. Mesocosm and field experiments were conducted to assess the growth characteristics and consequent nutrient accumulation by six ditch plant species. Of the six, Canna indica had the highest aboveground accumulation of N and P. About 85–95 % increase in the aboveground biomass was recorded at the end of the experimental period. The removal efficiencies of TN, TP, and NH4-N from the sewage reached up to 72–99.4, 64–98.7, and 75 %–100, respectively. Complete removal of all NO3-N was achieved. The amounts of N and P uptake by plant species were closely related to the biomass of plants. During the decaying process, N and P concentrations in the aboveground biomass decreased. These lost nutrients were eventually shifted to the system, which led to a deterioration of the water quality. Therefore, harvesting of aboveground biomass from inside the ditch is an appropriate intervention to prevent the release of N and P in the dormant season. The finding is important for planning an efficient eco-ditch system and predicting the influence of nutrient loading in the eco-ditches upon senescence of ditch plants.
- Published
- 2016
31. Effectiveness of Vegetated Drainage Ditches for Domestic Sewage Effluent Mitigation
- Author
-
Mathieu Nsenga Kumwimba and Bo Zhu
- Subjects
inorganic chemicals ,0106 biological sciences ,Nitrogen ,Health, Toxicology and Mutagenesis ,Lemna gibba ,Ditch ,Zingiberales ,Sewage ,010501 environmental sciences ,Toxicology ,01 natural sciences ,Centella ,Nutrient ,Species Specificity ,Waste Management ,Chlorophyta ,Ammonium Compounds ,Araceae ,Cyperus ,Effluent ,Ecosystem ,0105 earth and related environmental sciences ,Lythraceae ,geography ,geography.geographical_feature_category ,Nitrates ,biology ,Ecology ,business.industry ,010604 marine biology & hydrobiology ,Acorus ,Drainage, Sanitary ,food and beverages ,Phosphorus ,General Medicine ,Models, Theoretical ,biology.organism_classification ,Ficus ,Pollution ,Tracheophyta ,Agronomy ,Sewage treatment ,Cladophora ,Water quality ,business - Abstract
Plant species have an important role in eco-ditches; however, the Michaelis-Menten kinetic parameters of nutrient uptake, growth rate and purification efficiency of ditch plants and their influences on domestic sewage treatment efficiency are still unclear. Growth rates of all nine species, but especially Lemna gibba, Cladophora and Myriophyllum verticillatum were best in undiluted domestic sewage as opposed to a mixture of domestic sewage. Performance of species to accumulate nutrients was not only species-specific, but was also affected by both sewage treatments. Removal efficiency of nutrients was dependent on both plant species and treatment. Uptake kinetic parameters were significantly affected by both nutrient form and plant species. The maximum uptake rate (Vmax) of NH4-N was higher than NO3-N. Similarly, Km values for NH4-N were greater than NO3-N. These results could be used to identify plants for sewage treatment efficiency and enhance water quality in eco-ditch treatment systems.
- Published
- 2016
32. Metal Distribution and Contamination Assessment in Drainage Ditch Water in the Main Rice/Vegetable Area of Sichuan Hilly Basin
- Author
-
Tao Wang, Diana Kavidia Muyembe, Mathieu Nsenga Kumwimba, Zhao Yuan, and Bo Zhu
- Subjects
Pollution ,China ,010504 meteorology & atmospheric sciences ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,Ditch ,010501 environmental sciences ,Toxicology ,01 natural sciences ,Metals, Heavy ,Water Quality ,Environmental monitoring ,Vegetables ,0105 earth and related environmental sciences ,media_common ,Pollutant ,Hydrology ,geography ,geography.geographical_feature_category ,Land use ,Water ,Agriculture ,Oryza ,General Medicine ,Environmental science ,Water quality ,Surface water ,Channel (geography) ,Water Pollutants, Chemical ,Environmental Monitoring - Abstract
In order to assess the impact of four land use changes on metal concentrations in the hilly Sichuan Basin of China, 71 surface water samples were collected in July and November 2014. Samples from residential ditch water were found to have higher metal concentrations than those in other types of ditches, while the lowest occurred in barren land ditch water. However, the selected metals were below the Chinese surface water quality standards and WHO (2011). The pollution index of four determined land use types was also below the critical pollution index, suggesting there were low levels of pollution in Sichuan Basin. Arsenic was the most important pollutant of concern. Results indicate steps should be taken to control and reduce the risk of metals released from residential ditch water.
- Published
- 2015
33. A Preliminary Study on Genetic Variation of Arsenic Concentration in 32 Different Genotypes of Leafy Vegetable
- Author
-
Mathieu Nsenga Kumwimba, Xibai Zeng, Lingyu Bai, and Jinjin Wang
- Subjects
fungi ,food and beverages ,chemistry.chemical_element ,Chromosomal translocation ,Root system ,Biology ,Hydroponics ,Crop ,Agronomy ,chemistry ,Bioaccumulation ,Shoot ,Cultivar ,Arsenic - Abstract
Leafy vegetables are a food crop with higher protein and are also important source of minerals which are essential for good health. Due to the large consumption, it is necessary to decrease the arsenic (As) concentration in leafy vegetable to avoid the potential risk to human health. The current study is aimed at assessing arsenic (As) accumulation ability and identification of cultivars with less As concentration that could be grown in As contaminated farmland for food safety. A set of thirty two leafy vegetable cultivars from 5 species were compared in hydroponics for 2 weeks having moderate level of 0- control and 6 mg As L -1 . At harvest, plants were sampled and analyzed for As concentration. Significant genotypic variations were observed in the shoots As concentration, translocation and bioaccumulation factors revealing more than 8 and 25 times cultivar differences in shoot As concentration, and in translocation factors respectively. This result revealed that As concentration in shoot was in part governed by the greater ability of root-shoot translocation. Cultivar Sijibaiye (SJBY) had the lowest shoot As concentration while the highest was detected in Dayekongxincai (DYKXC). The average As concentration in roots were found to be ten to twenty times higher than those observed in shoots, indicating that there is restricted transport of As from the root system to the shoot of cultivars. Therefore, it has been suggested that there is possibility to lower the As concentration in leafy vegetables by selecting and breeding cultivars with less As concentration that can be safely grown in contaminated soils with the slight and moderate levels of As for safe consumption.
- Published
- 2014
34. Enhancement of Fecal Sludge Conversion Into Biogas Using Iron Powder During Anaerobic Digestion Process
- Author
-
Biaou Dimon, Olusegun K. Abass, Ignace Chabi Agani, Frank Yovo, Valentin D. Wotto, Mathieu Nsenga Kumwimba, Edouard Binessi Ifon, and Fidèle Suanon
- Subjects
020209 energy ,chemistry.chemical_element ,02 engineering and technology ,General Medicine ,engineering.material ,Sulfur ,Nitrogen ,Methane ,Iron powder ,Anaerobic digestion ,chemistry.chemical_compound ,chemistry ,Biogas ,Environmental chemistry ,0202 electrical engineering, electronic engineering, information engineering ,engineering ,Fertilizer ,Anaerobic exercise - Abstract
Anaerobic digestion is often used to stabilized and convert organic wastes into methane and biological fertilizer. However, when applied to fecal sludge, it doesn’t yield good methane due to its high content of nitrogen. Here we have conducted anaerobic digestion of fecal sludge in the presence of iron powder (Fe) as electron donor. Results showed that 4822.7 mL CH4 kg-1 was successfully recovered from fecal sludge in the control. The use of Fe in the anaerobic bio-digester remarkably improved methane yield. Indeed, up to 9933.3 mL CH4 kg-1 wet sludge was recovered when Fe is properly used (1 g Fe for 400 g wet weight), compared to 4822.7 mL kg-1 in the control. The concentration of methane in the produced biogas increased from 58.0% in the control to 72.5% and 77.6% in the presence of iron powder, respectively at the dose rate of 0.5 g Fe and 1 g Fe per 400 g wet sludge. COD removal efficiency was also greatly improved. 65.5% of COD was removed when excreta was properly spiked with Fe (1g Fe) against 42.2% in the control. This corresponds to an increasing rate of 23%. Furthermore, the presence of Fe in the digesters considerably reduced the odor by trapping produced sulphur ion and prevent the formation of H2S responsible for the sickening odor.
- Published
- 2016
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