18 results on '"Mathieu Nsenga Kumwimba"'
Search Results
2. 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
- Published
- 2023
3. 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
4. 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
- Published
- 2022
5. 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.
- Published
- 2019
6. 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.
- Published
- 2020
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7. 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.
- Published
- 2020
8. 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
9. 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.
- Published
- 2021
10. Plant soaking decomposition as well as nitrogen and phosphorous release in the water-level fluctuation zone of the Three Gorges Reservoir
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Mathieu Nsenga Kumwimba, Liwei Xiao, Bo Zhu, and Shiwei Jiang
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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.
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- 2017
11. Anammox-based processes: How far have we come and what work remains? A review by bibliometric analysis
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Tommaso Lotti, Mathieu Nsenga Kumwimba, Fidèle Suanon, Engin Şenel, and Xuyong Li
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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
12. How to enhance the purification performance of traditional floating treatment wetlands (FTWs) at low temperatures: Strengthening strategies
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Ammara Batool, Mathieu Nsenga Kumwimba, and Xuyong Li
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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
13. Distribution and risk assessment of metals and arsenic contamination in man-made ditch sediments with different land use types
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Tao Wang, Diana Kavidia Muyembe, Mathieu Nsenga Kumwimba, and Bo Zhu
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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
14. Growth characteristics and nutrient removal capability of eco-ditch plants in mesocosm sediment receiving primary domestic wastewater
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Diana Kavidia Muyembe, Mawuli Dzakpasu, Bo Zhu, and Mathieu Nsenga Kumwimba
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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
15. Assessing Nutrient, Biomass, and Sediment Transport of Drainage Ditches in the Three Gorges Reservoir Area
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Bo Zhu, Dong Zhixin, Jialiang Tang, Diana Kavidia Muyembe, Tao Wang, Mathieu Nsenga Kumwimba, and Liwei Xiao
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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
16. Long-term impact of primary domestic sewage on metal/loid accumulation in drainage ditch sediments, plants and water: Implications for phytoremediation and restoration
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Mawuli Dzakpasu, Diana Kavidia Muyembe, Mathieu Nsenga Kumwimba, Fidèle Suanon, and Bo Zhu
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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
17. Uptake and Release of Sequestered Nutrient in Subtropical Monsoon Ecological Ditch Plant Species
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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
18. Enhancement of Fecal Sludge Conversion Into Biogas Using Iron Powder During Anaerobic Digestion Process
- Author
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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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