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[Objective] Concerning interdisciplinary research, the use of chemicals in colleges and universities is expanding, presenting considerable challenges for standardized management. National laws and regulations require stringent verification and registration systems for importing and exporting hazardous chemicals, ensuring control throughout their use cycle. This includes maintaining records from purchase requests to receipt, use, recovery, and destruction, which ensures consistency between inventory materials and usage records. However, managing chemicals in colleges and universities is complicated by practical factors such as multiple usage types, small stock of single products, wide professional coverage, and dispersed storage areas. These factors make real-time accounting, scientific classification, and storage in the actual management process difficult. Therefore, to address the challenge of building a chemical cloud platform based on data fusion, aligning with national requirements and the specific needs of schools is essential. The goal is to achieve comprehensive real-time supervision of chemicals throughout their lifecycle. [Methods] A real-time chemical management system is developed using data fusion technology. This system organizes the three-party, four-dimensional, and multilevel data matrix involved in chemical management. It integrates multisource, multiform, and multilevel data flows from procurement, process management, storage cabinet monitoring, hazardous waste disposal, and regulatory management. Through series, splicing, and aggregation, multisource data are shared and integrated, thereby creating a unified dataset via feature extraction. This approach provides access to comprehensive chemical management data and supports fast calculations, real-time supervision, and intelligent notifications. [Results] By integrating data fusion technology into the chemical management system, focusing on source control, inventory limitation, intelligent supervision, and quality improvement as the path, a comprehensive framework has been established. This includes the development of software and hardware for a single body, two wings, and multiple fulcrum chemical management models. Key achievements include the creation of a cloud mall for chemical purchases and a cloud platform for the entire process management. Additionally, university-level reagent and hazardous waste storage facilities have been built, and smart chemical storage cabinets have been purchased in batches. [Conclusions] Leveraging data characteristics and full data integration, the chemical real-time management system now centers around a two-dimensional code approach as the core. This system enables real-time management system construction of scanning code opening, scanning code storage, timely weighing, and automatic accounting. Enhanced safety measures, improved management team, rigorous supervision and inspection, and upgraded facility configurations ensure comprehensive data management of chemicals from purchase to disposal. This setup allows for real-time supervision of chemical usage. [ABSTRACT FROM AUTHOR]

Based on the research status and progress of remediation technology combination of contaminated soil and groundwater in petrochemical sites at home and abroad- This paper summarizes the advantages, disadvantages and application scenarios of each restoration technology combination, summarizes the existing problems of the restoration technology combination, such as unclear restoration mechanism, insufficient coordination of contaminated soil and groundwater restoration, and few pilot demonstration research results of actual contaminated sites. The development trend of restoration technology combination research and application is also prospected. In order to provide important reference for the development and application of low-cost and efficient remediation technology of contaminated soil and groundwater in petrochemical sites. [ABSTRACT FROM AUTHOR]

CuFeO2 nanoparticles were decorated on biochar by one-step hydrothermal method to form the CuFeO2 /BC catalyst for persulfate (PS) activation and application of CuFeO2/BC in sulfadiazine (SDZ) contaminated soil was explored in this study. The influence of some key factors such as catalyst doses, PS concentration, initial pH and different soil types on degradation of SDZ were investigated. The results showed that CuFeO2/BC system has better catalytic performance and PS utilization efficiency compared with the pure CuFeO2. Under the condition of CuFeO2/BC dosage of 8 g/kg and PS addition of 3 g/kg, 91.72% SDZ (initial concentration of 20 mg/kg) could be removed from the soil within 120 minutes. Furthermore, the mechanism of the CuFeO2/BC/PS system was revealed by quenching experiments and electron paramagnetic resonance (EPR) tests. It demonstrated that active species (SO4•-, HO•, O2•-) were involved in SDZ degradation, the weak EPR signal confirmed the existence of 1O2 but not participated in the degradation of SDZ. The steady-state concentrations of HO• and SO4•- were calculated by using free radical probes. Afterwards, the contribution rates of SO4•-, HO•, O2•- to the degradation of SDZ were obtained to be 43.89%, 32.87%, and 23.24%, respectively. Combined X-ray photoelectron spectroscopy revealed that the high catalytic efficiency was attributed to the synergistic effect of Cu+/Cu2+ and Fe2+/Fe3+ redox cycles. These findings help to achieve more comprehensive understanding of the heterogeneous activation process of PS by CuFeO2 /BC to degrade SDZ in actual contaminated sites. [ABSTRACT FROM AUTHOR]

Identifying the source of pollution and clarifying the pollution responsibility is an important basis for groundwater environmental protection. In this study, a chemical industry park and its adjacent landfill in the Pearl River Delta region was selected as the investigation object. We characterize the distribution of groundwater pollution, and identify the source of groundwater pollution based on both PMF model and stable isotope technique. The results showed that the detected concentration of pH, NH4+, Fe, Mn indicated the groundwater pollution. The most serious point was near the junction between the chemical park and the landfill, in which the concentration of NH4+, Fe, Mn was 68.20, 28.10, 15.80 mg/L, respectively. The PMF model initially revealed the influencing factors of groundwater quality in the study area, which were hydrogeochemical evolution (43.1%), anthropogenic pollution (27.9%) and primary geological process (15.7%). The δ15N-NH4+ value further confirmed the landfill was the main contributor to groundwater ammonia nitrogen pollution. The groundwater pollution sources and contribution rates were effectively identified through the combination of PMF model and stable isotope technology, and the pollution responsibilities among different pollution sources were clarified, providing scientific support for groundwater pollution prevention and environmental management. [ABSTRACT FROM AUTHOR]

The foam-blocking material formula was optimized through single factor and uniform mixing design experiment methods. The effect of foam material on blocking volatile organic compounds" VOCs) was estimated by VOCs release chamber combined with GC. The structure and stability of foam were characterized by dynamic foam analyzer. The result showed that the volatilization blocking rate of tetrachloroethylene- enemy-heptane and toluene by form was close to 100% within 5 hand the foam structure was stable after 5 h of foaming. The engineering application method of foam-blocking material was established through the engineering demonstration experiment on contaminated site. As the result showed that the foam block rate of VOCs pollutants was 98% within 5 h. [ABSTRACT FROM AUTHOR]

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In-situ chemical oxidation (ISCO) refers to the use of appropriate conveyance technology to transport oxidants into soil or aquifer, where the contaminants are converted to low- or non-toxic substances by chemical oxidation. ISCO has been widely used for the remediation of organic contaminants in soil and groundwater due to its high efficiency and cost effectiveness. Oxidant demand is an important parameter in the application of ISCO. Once injected into the contaminated soil or aquifer, the oxidant reacts not only with the target contaminants, but also with natural organic matter (NOM) and reductive minerals ( RM) such as Fe2+, Mn2+, S- and S2- in the medium. In addition, the oxidant may decompose naturally due to its own properties. If the amount of oxidant used is insufficient, the remediation of the contaminated site may not meet the project objectives and residual contaminants or reaction intermediates may be formed, resulting in a rebound of the contaminant concentration at the site. If too much oxidant is used, it would not only increase the cost of remediation, but also seriously damage the physical and chemical properties of soil, reducing the diversity of microbial communities. Therefore, accurate measurement of oxidant requirements is important to achieve good remediation performance. In previous studies, the specific meaning of terms related to oxidant demand is not consistent and they are often mixed in different studies, which would lead to ambiguity. In this review the composition and definition of oxidant demand is clarified and unified. The total oxidant demand (TOD) in ISCO is composed of pollutant oxidant demand (POD, the amount of oxidant consumed by oxidative degradation of pollutants), natural oxidant demand (NOD, the amount of oxidant consumed by natural organic matter and reducing minerals in soil or aquifer media), and decomposed oxidant (DEO, the amount of oxidant naturally decomposed due to its nature and the influence of environmental conditions). The methods for determining oxidant demand can be divided into two categories: experimental method and stoichiometric model method. The basic principle of the experimental method is to mix the treated medium sample with the oxidant in a system for a period of time, and then calculate the oxidant consumption before and after reaction to obtain the oxidant demand per unit of medium. Specifically, the experimental method can be divided into batch test, column test, push-pull test and reaction kinetics model according to the scale and dimension of the experiment. Among them, the batch test has been relatively widely used due to its excellent characteristics of simplicity and efficiency. The column test is more capable of reflecting the actual consumption of oxidant in the field medium, taking into account the transport process and interaction of oxidant in porous media. Although the push-pull test is carried out at the field scale, which can effectively overcome the error caused by the difference between laboratory conditions and field conditions, it is relatively complex to operate. Finally, the reaction kinetics model can be used to analyze the oxidant consumption in the reaction process based on experiments. This method can characterize the oxidant consumption on a longer time scale, which is of great importance for potassium permanganate or sodium persulfate oxidants with longer reaction times. The determination of oxidant demand by experimental method is affected by factors such as the initial concentration of oxidant, reaction time, solid-to-liquid ratio and mixing conditions of the reaction. To facilitate comparison of data and costing of the project, it is necessary to incorporate experimental conditions into the expression of oxidant demand. For example, the difference of the oxidant demand obtained at different times for the same sample can be as much as 37%. Therefore, the time required for the pollutant concentration to be reduced to the target limit by oxidation should be used as the oxidant demand determination time. Stoichiometric model method is the determination of the theoretical oxidant demand value by the establishment of the stoichiometric relationship model between the oxidant demand and the components in the medium. The stoichiometric model method was originally designed to explore the relationship between the total organic carbon in the medium and the oxidant demand. It was then developed to consider the oxidant demand of natural organic matter, other mineral ions and organic pollutants as a whole. Calculation results of the stoichiometric modelling method depend on the accuracy of the model and the precise determination of the content of relevant components in the medium. Both experimental method and stoichiometric model method mostly take potassium permanganate oxidant as the research object, but there is a lack of research on the demand of Fenton reagent, ozone and sodium persulfate. In particular, the DEO of more decomposable oxidants such as Fenton reagent and ozone may reach more than 50% of TOD. The existing methods still face difficulties in accurately measuring DEO, which deserves special attention. As a component of TOD that is easily overlooked, the importance of DEO needs to be further clarified and more accurate measurement methods need to be explored. In the actual project, the number of injection wells, well spacing, oxidant injection rate and other design parameters will have an important impact on the total oxidant demand, which still needs to be further investigated. The remediation of contaminated sites by ISCO is a complex project and a more scientific workflow or guideline is necessary for engineers to determine oxidant demand. [ABSTRACT FROM AUTHOR]

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A series of environmental issues such as the relatively complex structure of gas reservoirs, the comparatively fragile ecological environment and the unclear environmental impact mechanisms have become significant bottlenecks, restricting the development of shale gas in China. At present, there are still very few studies on ecological risk assessment of shale gas development sites in China, and it is far from forming a technical system. Due to the interaction between individuals and between the environment and individuals, ecological risk assessment at the individual level often cannot fully reflect the overall impact of chemical pollutants on the ecological environment, and therefore, carrying out ecological risk assessment at the population level plays an important role in improving the accuracy of the assessment. In this paper, based on the hotspots and development trends in the field of population ecological risk assessment through cluster analysis, we systematically sort out the content of population-level ecological risk assessment models using bibliometric methods. The population ecological risk assessment models that are suitable for characteristic pollutants in typical shale gas development areas in China are compared and screened, and the availability and uncertainty of these models in shale gas development scenarios are discussed, aiming to provide references for the prevention and control of environmental risks in such contaminated sites in China. [ABSTRACT FROM AUTHOR]

During the urbanization process of China, the planned "New Town" in some cities may be built on the contaminated left-over sites located in former suburban industrial zones. The complexity of the land-use plans of urban new towns may cause uncertainties to the investigation and evaluation of contaminated sites. The present study chooses a contaminated left-over site from fuel oil leakage accidents, which is now planned as cultural event facility in an urban new town. Based on sample analysis results of the site, human health risk assessment is conducted on the soil-sampling points with total petroleum hydrocarbons (C10 - C40) with excessive levels considering the actual scenes of cultural event facility land-use. The results show that total petroleum hydrocarbons in the studied site have significant human health risks. However, the human health risks from contaminants are underestimated upon the relevant land-use classification in current national standards. The present study reveals the existing "grey zone" in risk assessment and screening values of contaminated sites, coupling with the potential negative impacts on users' health risks, which should arise sufficient concerns in the practice of contaminated site investigations and remediation in China. [ABSTRACT FROM AUTHOR]

Many industrial contaminated sites have been left in urban areas, due to the relocation and retirement of industrial enterprises, and their potential environmental risks have attracted great attention all over the world. In such circumstance, some developed countries (regions) in Europe and America have formed their own characteristic environmental risk assessment frameworks (ERAF), based on the risk/toxicity assessment of chemicals. In China, the ERAF in line with current realistic situation is gradually developed, by integrating foreign experience. This paper systematically reviews the formulation and development of the ERAF for contaminated sites in China, the United States, the European Union, the Netherlands, the United Kingdom, etc. The primary objectives, decision-making and management process, scientific orientations, and key innovations of these ERAFs are summarized. In addition, the promotion, support and guiding roles of key laws, regulations, policies, and technical guidelines of each country (region) in specific historical period are outlined. This review can provide a useful reference for the development and improvement of ERAF for contaminated sites in China. [ABSTRACT FROM AUTHOR]

As a potential radioactive pollution source, uranium tailings ponds may cause radioactive pollution of groundwater if no liner system were taken. To select the reasonable liner system for a radioactive tailings pond under decommissioning, the technical characteristics of horizontal liner and vertical barriers were compared and analyzed, and the seepage control effect of horizontal liner and vertical barriers was analyzed from the perspectives of environmental protection and cost by the empirical formula and numerical simulation methods. The results show that both horizontal liner and vertical barriers can effectively reduce the amount of leakage from the tailings pond, and the horizontal liner is better. The results can provide technical support for the design of the liner system of uranium tailings ponds, and can also provide a reference for the design of the liner system of other associated radioactive waste ponds and hazardous waste facilities. [ABSTRACT FROM AUTHOR]

BACKGROUND: Human health risks and potential environmental geological hazards caused by contaminated sites have been paid much attention. Monitored natural attenuation (MNA) is recognized as a preferred remediation technique. However, for sites with non-aqueous phase liquids (NAPLs), the problem of “tailing rebound” caused by the residue of NAPLs in the source area poses a challenge to the MNA technology. In recent years, the emergence of natural source zone depletion (NSZD) enriches the connotation of MNA remediation, and it is a potential way to solve the problem of “Tailing & Rebound”. OBJECTIVES: To summarize the research process and latest achievements of NSZD for light non-aqueous phase liquid (LNAPL) contaminated sites. METHODS: A comprehensive review was conducted on the literature on NSZD for LNAPL contaminated sites from the end of the 1990’s. The conceptual models of vertical zoning natural elimination in LNAPL source areas have been reviewed. The key control factors on NSZD and main scientific and technological challenges for future research have been fully discussed. RESULTS: The research shows that: (1) since 2000, the research on MNA remediation has gradually shifted from groundwater pollution plume attenuation to natural depletion of vadose zone source areas; (2) The natural elimination process of aeration zones has proved to be the key biological process of NSZD, accounting for 90% - 99% of the total mass loss of LNAPLs; (3) biodegradation in the volatilization process of LNAPL is the major research field of NSZD. The following research methods of NSZD are established: (1) the NSZD method can be divided into three parts: LNAPL source area plume identification, qualitative judgment and quantitative estimation; (2) The Concentration Gradient Method, CO2 Fluxes Method ( including Dynamic Closed Chambers and CO2 Traps) and Thermal Gradient Method are three major methods for quantitative estimation. CONCLUSIONS: Based on the existing research progress and challenges, the key scientific problems to be solved in the application and promotion of NSZD include identifying the composition change of LNAPLs in the source area, clarifying the speed limiting factor for natural elimination in the source area, and developing appropriate monitoring methods for degassing and bubble escape. [ABSTRACT FROM AUTHOR]

Copyright of Asian Journals of Ecotoxicology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Asian Journals of Ecotoxicology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China Normal University (Natural Science Edition) / Huanan Shifan Daxue Xuebao (Ziran Kexue Ban) is the property of Journal of South China Normal University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)