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SSRN 2023年

作者： Xu, Yao Xu, Shuang Qian, Yajie Liu, Tongcai Zhang, Longlong Li, Dapeng Zhang, Yalei Chen, Jiabin Zhou, Xuefei State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215000 China College of Environmental Science and Engineering Donghua University Shanghai201620 China

The long-term insufficient dissolved oxygen (DO), excessive nitrogen (N) and phosphorus (P) have become the main causes of the troublesome eutrophication. Herein, a 20-day sediment core incubation experiment was conducted to comprehensively evaluate the effects of two metal-based peroxides (MgO2 and CaO2) on eutrophic remediation. Results indicated that CaO2 addition could increase DO and ORP of the overlying water more effectively and improve the anoxic environment of the aquatic ecosystems. However, the addition of MgO2 had a less impact on pH of the water body. Furthermore, the addition of MgO2 and CaO2 removed 90.31% and 93.87% of continuous external P in the overlying water respectively, while the removal of NH4+-N was 64.86% and 45.89%, and the removal of TN was 43.08% and 19.16%. The reason why the capacity on NH4+-N removal of MgO2 was higher than that of CaO2 is mainly that PO43- and NH4+ can be removed as struvite by MgO2. Compared with MgO2, mobile P of the sediment in CaO2 addition group was reduced obviously and converted to more stable P. Notably, the microbial community structure of sediments was optimized by MgO2 and CaO2, which showed that the relative abundance of anaerobic bacteria decreased and that of aerobic bacteria increased significantly, especially some functional bacteria involved in the nutrient cycle. Taken together, MgO2 and CaO2 have a promising application prospect in the field of in-situ eutrophication management. © 2023, The Authors. All rights reserved.

关键词： Nitrogen

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Comparison of Four Pre-Oxidants Coupled Powdered Activated Carbon Adsorption for Odor Compounds and Algae Removal: Kinetics, Process Optimization, and Formation of Disinfection Byproducts

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SSRN 2023年

作者： Zhao, Heng-Xuan Zhang, Shuang Zhang, Tian-Yang Zhu, Yiping Pan, Ren-Jie Xu, Meng-Yuan Zheng, Zheng-Xiong Hu, Chen-Yan Tang, Yu-Lin Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Shanghai Chengtou Raw Water Limited Company Beiai Road Shanghai200125 China College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai200090 China

This study systematically investigated the combination schemes of four oxidants (KMnO4, NaClO, ClO2, and O3) and powdered activate carbon (PAC) on the inactivation of Microcystis aeruginosa cells and removal of four frequently detected odorants in raw water (diethyl disulfide (DEDS), bis(2-chloroisopropyl)ether (BCIE), 2-methylisoborneol (2-MIB) and geosmin (GSM)). O3 showed highest pseudo-first-order removal rates for all four compounds and NaClO exhibited highest inactivation rates for the cell viability and Chlorophyll a (Chl-a). The Freundlich model fits well for the adsorption of DEDS and BCIE by PAC. The removal of total odorants and algae cells by combined treatment processes, i.e., pre-oxidation/post-PAC and pre-PAC/post-oxidation were lower than that of each scheme alone. Whereas, an enhanced treatment performance can be achieved by prolonging the time interval of oxidation and PAC adsorption. The pre-PAC/post-oxidation processes possess comparable efficiency for the removal of odorants and minor lower inactivation rates of algae cells than pre-oxidation/post-PAC process, but can significantly inhibit the formation of disinfection byproducts (DBPs), especially for the formation of C-DBPs (for NaClO and ClO2), bromate (for O3) and chlorate/chlorite (for ClO2). This study can provide a better understanding of improving in-situ operation of the combined oxidation/PAC system for source water pretreatment. © 2023, The Authors. All rights reserved.

关键词： Chlorine compounds

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Synthesis of Heat-Resistant Boron Carbonitride with Nitrogen-Vacancies and Oxygen-Doping for Efficient Pollutant Adsorptive Removal and Thermal Regeneration

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SSRN 2023年

作者： Miao, Xudong Guo, Yong Wei, Sixian Chen, Ying Zhu, Qingmu Zhang, Xueyang Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing210098 China Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental Engineering Xuzhou University of Technology Xuzhou221018 China State Key Laboratory of Treatments and Recycling for Organic Effluents by Adsorption in Petroleum and Chemical Industry Soochow University Suzhou215123 China

In order to make the adsorbent cleaner and more environmentally friendly, high adsorption performance boron carbonitride (BCNvO) with nitrogen-vacancies (Nv) and oxygen-doping (Od) are prepared by oxygen-limited method in the first time. 15-BCNvO-0.9 exhibits high adsorption quantity for antibiotic (tetracycline: 199.30 mg·g-1), dyes (methylene blue: 119.54 mg·g-1, methyl orange: 113.56 mg·g-1, congo red: 142.78 mg·g-1, neutral red: 1079.20 mg·g-1), and heavy metal (Cu2+: 160.48 mg·g-1). In addition, 15-BCNvO-0.9 has favorable application for co-existing pollutants. The total alkalinity of the 15-BCNvO-0.9 surface (the ability to capture protons) is the main contribution to the adsorption tetracycline. EPR and XPS characterizations confirm the existence of Nv and Od. The adsorption of tetracycline on 15-BCNvO-0.9 is spontaneous and satisfies second-order kinetic as well as Langmuir isotherm model. Theoretical calculations indicate that Nv and Od can enhance the ability of 15-BCNvO-0.9 to capture protons and the captured protons can serve as new adsorption sites for tetracycline adsorption. The protonated 15-BCNvO-0.9 has the highest adsorption energy for tetracycline compared to 15-BCNvO-0.9 and BCN-N2, which corroborates the contribution of total alkalinity to the adsorption. After 4 times of thermal regeneration in oxygen-limited, the adsorption quantity and mass of 15-BCNvO-0.9 are 14.53 times and 8.27 times of activated carbon, respectively. Therefore, the efficient pollutants removal and thermal regeneration performance of BCNvO provide the possibility for wide applications in wastewater treatment. © 2023, The Authors. All rights reserved.

关键词： Activated carbon

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Modifying Functional Groups of Straw-Based Hydrogel Provide Soil N2o Mitigation Potential by Complete Denitrification

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SSRN 2024年

作者： Wang, Weishuai Ma, Lin Wang, Xuan Qin, Shuping Luo, Jiafa Bai, Zhaohai Yuan, Jiao Key Laboratory of Agricultural Water Resources Hebei Key Laboratory of Soil Ecology Center for Agricultural Resources Research Institute of Genetic and Developmental Biology Chinese Academy of Sciences 286 Huaizhong Road Hebei Shijiazhuang050021 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China Ruakura Research Centre AgResearch Limited Hamilton3240 New Zealand Fujian Agriculture and Forestry University China Institute of Soil Sciences

Farmed soil is considered to contribute more than 60% anthropogenic N2O emission which plays critical role in global warming potential. Straw-based hydrogels with abundant functional groups are commonly used in environmental and agronomic applications primarily as adsorbents. Those functional groups could mediate electron transfer in the process of adsorbates and might also regulate N2O emission. However, it was still unclear whether and how these functional groups affect the process. To address this knowledge gap, we employed spectral analysis and a robotized incubation system to determine mechanisms of different functional groups in influencing soil N2O. The results indicated that the straw-based hydrogel was capable of significantly reducing the emission of N2O in denitrification, and the electrochemical properties of the hydrogel had a regulatory effect on microbial denitrification process. Specifically, carboxymethyl (R-COO) and primary amine groups (R-NH2) promoted complete denitrification through electron supply. Furthermore, R-NH2 had a significant negative correlation with N2O emissions. To further verify the role of specific structures and functional groups in denitrification, we conducted an experiment using pure lignin as a template. This experiment resulted in an increase in R-NH2 content to 13.2% and a decrease in N2O emissions by 49.1% compared with straw hydrogel. These results prove the feasibility of straw-based hydrogel as a redox system to regulate denitrification, and the electron-donating functional groups were significantly related to the reduction rate of N2O. Finally, based on these mechanisms, functional group targeted grafting technology was proposed to improve its ability to regulate N2O emission reduction. © 2024, The Authors. All rights reserved.

关键词： Hydrogels

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Multigenerational Metastatic Effects of Perfluorooctanoic Acid (PFOA) on Drosophila Melanogaster with Metabolic Reprogramming and Dysrhythmia

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SSRN 2023年

作者： Fangninou, Fangnon Firmin Yu, Zhenyang Li, Wenzhe Xue, Lei Yin, Daqiang Institute of Intervention Vessel Shanghai 10th People's Hospital China State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Laboratory of Applied Ecology Faculty of Agronomic Sciences University of Abomey-Calavi Cotonou01 BP 526 Benin College of Life Science and Technology Tongji University Shanghai200092 China

Perfluorooctanoic acid (PFOA) exposure correlated with various cancers and their mortality. However, it remained unanswered whether its persistent exposure could influence metastasis which contributes ~90% to cancer mortality. In the present study, long-term effects of PFOA were measured in Drosophila melanogaster over 3 consecutive generations. In the morning-eclosed (AM) adult flies, PFOA significantly promoted tumor invasion rates and distances which increased over generations. Regarding metabolic reprogramming, PFOA disturbed the expressions of Glut1 and Pdk1, activities and contents of FASN1 (fatty acid synthase), ACC (acetyl-CoA carboxylase) and SREBP1 (sterol regulatory element binding protein). Regarding antioxidant responses, PFOA exposure generated provoked oxidative stress via H2O2 and stimulated antioxidants including glutathione (GSH), catalase (CAT), melatonin, serotonin and cortisol, with downregulations on PI3K/AKT pathways and upregulations on MAPK ones. The biochemical and molecular effects altered over generations. In the afternoon-eclosed (PM) adult flies, the metastasis of PFOA was more deteriorated than in AM adults. The significant influences by dysrhythmia were also observed in the multigenerational effects of PFOA on the metabolism reprogramming and antioxidant responses. The effects on rhythm regulating gene expressions and protein levels explained the dysrhythmia and also indicated close interactions among metabolism reprogramming, antioxidant responses and rhythm regulation. © 2023, The Authors. All rights reserved.

关键词： Metabolism

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Synergical Effects of Nb and Sio2 on Enhanced No Elimination and Sulfur Resistance of Fe2o3-Scr Catalyst

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SSRN 2023年

作者： Zhao, Wenrui Li, Lulu Ji, Jiawei Jiang, Peiting Zou, Weixin College of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang212000 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Jiangsu Key Laboratory of Vehicle Emissions Control Nanjing University Nanjing210023 China Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing210023 China Stata Key Laboratory of Green Chemical Engineering and Industrial Catalysis Sinopec Shanghai Reaserch Institute of Petrochemical Technology Shanghai201208 China

Fe2O3-based catalysts have attracted increasing interests for their use in NH3-SCR (selective catalytic reduction) reaction, while the wide application of Fe2O3-based catalysts is limited by its unsatisfying NO conversion at low temperature and poor anti-SO2 ability. In this study, by virtue of FeSi composite oxide with large specific surface area as support obtained by doping Si into pristine Fe2O3, and NbOx species was used for surface modification to further regulate their acidity and redox properties, significantly improving their NH3-SCR activity. The optimal Nb/FeSi catalyst exhibited over 90% NO conversion in the temperature interval of 250-400 oC and displayed excellent SO2 resistance at 225 oC. These resulting catalysts were characterized by various techniques to study their key physicochemical properties and identify their catalytic roles for NH3-SCR performance. For the contribution of different components to the catalytic activity, Si contributes large specific surface area and more Brønsted acid sites, facilitating the dispersion of active components and the activation of NH3 species. Nb could promote the generation of more oxygen vacancies and abundant Brønsted acid sites while inhibits the adsorption of NOx. This work provides experimental guidance to improve the activity and sulfur resistance of denitration catalyst by active component control. © 2023, The Authors. All rights reserved.

关键词： Silica

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Interfacial mechanism of asymmetric Gemini surfactant in synergy with kerosene for enhancing low-rank coal flotation

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 722卷

作者： Wang, Xin Cui, Xinyu Ding, Rui Cheng, Gan Qin, Yonghong Abaka-Wood, George Gao, Guandao Li, Enze Cheng, Fangqin Institute of Resources and Environmental Engineering State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources Shanxi Laboratory of Yellow River Shanxi University No. 92 Wucheng Road Taiyuan030006 China ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals Future Industries Institute University of South Australia AdelaideSA5095 Australia State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University No. 163 Xianlin Road Nanjing210023 China

The depletion of high-quality coal resources has led to the increasing prominence of low-rank coal (LRC) in the energy sector. Flotation based on gas/liquid/solid interfacial interaction remains an effective way to recovery of combustible matter and achieve clean utilization of LRC. Addressing the low efficiency and high consumption of traditional hydrocarbon oils (such as kerosene) in LRC flotation has been a major focus of researchers. In this work, the performance and interfacial mechanism of asymmetric Gemini surfactant in synergy with kerosene for enhancing LRC flotation were investigated. The flotation results showed that among the three Gemini surfactants, ethylene-based [(octyl dimethyl/tetradecyl dimethyl) chloride ammonium] (G8–14) exhibited the best synergistic effect. Optimization of the synergistic flotation process of G8–14 and kerosene for LRC was performed with response surface methodology (RSM) using Box-Behnken design. A quadratic model was generated for predicting the combustible matter recovery, and it was also used to optimize the flotation conditions. The optimum conditions were determined and included G8–14 concentration of 91.11 mg/L, pH of 8.38, and pulp density of 80.38 g/L. Under optimum conditions, the combustible matter recovery reached 78.72 %. The hydrophobicity and zeta potential of LRC surface were obviously enhanced, and it made kerosene easier to spread and adsorb on LRC surface after treatment by G8–14. The ‘bridging action’ of G8–14 molecule between the negatively charged sites at LRC surface and kerosene was confirmed as the major mechanism for the enhancement of their interfacial interaction. This study provides new technical supports and theoretical insights for the clean and efficient utilization of LRC. © 2025 Elsevier B.V.

关键词： Froth flotation

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Enhanced Selective Electroadsorption of Nitrate from Wastewater by controllably Doping Nitrogen into Porous Carbon with Micropores

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SSRN 2023年

作者： Wang, Yue Ge, Yu Liu, Zifan Wang, Ruoding Chen, Yanqi Qian, Hang Yin, Zhonglong Liu, Fuqiang Yang, Weiben Jilin Normal University China Nanjing Normal University China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing210023 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Abstract: The biological NO3- removal process might be accompanied by high CO2 emission and operation costs. Capacitive deionization (CDI) has been widely studied as a very efficient method to purify water. Here, a porous carbon material with a tunable nitrogen configuration was developed. Characterization and density function theoretical calculation show that nitrogenous functional groups have higher NO3- binding energy than Cl-, SO42- and H2PO4-. In addition, the selectivity of NO3- is improved after introducing micropores by using the pore template. The NO3- removal of the optimized electrode (MN-C-12) is 4.57 times that of activated carbon (AC) and selectivity (NO3-/H2PO4-: 3.46, NO3-/SO42-: 3.69 and NO3-/H2PO4-: 5.42). The high NO3- selectivity and electroadsorption properties of MN-C-12 (the highest N content and micropore area) are due to the synergistic effect of the affinity of nitrogen functional groups to NO3- and microporous ion screening. A CDI unit for the removal of nitrogen from municipal wastewater was constructed and applied to treat wastewater meeting higher discharge standards of A (N: 15 mg/L) and B (N: 20 mg/L) ((GB18918–2002), China). This work provides new insights into the enhanced carbon material for selective electrosorption of wastewater by CDI technology. © 2023, The Authors. All rights reserved.

关键词： Activated carbon

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Metagenomic insights into the variation of bacterial communities and potential pathogenic bacteria in drinking water treatment and distribution systems

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National Science Open 2022年第2期1卷 65-79页

作者： Ruiming Jiang Zihan Li Qisheng Li Yunqi Liu Yuning Zhu Zimo Chen Peng Liu Shuyu Jia Hongqiang Ren Xu-Xiang Zhang State Key Laboratory of Pollution Control and Resource Reuse Environmental Health Research CenterSchool of the EnvironmentNanjing UniversityNanjing 210023China China Three Gorges Construction Engineering Corporation Beijing 100048China Nanjing Foreign Language School Nanjing 210008China

High-throughput sequencing of 16S rRNA gene amplicons was conducted to characterize the changing patterns of bacterial community and potential pathogens in full-scale drinking water treatment and distribution *** showed that Actinobacteria was the predominant phylum in source water,while Proteobacteria dominated after chlorine disinfection and its relative abundance increased from 40.88%±9.45%to 67.86%±27.10%.The genera Pseudarthrobacter,Arenimonas,and Limnohabitans were effectively removed by chlorination,while Phreatobacter,Undibacterium,Pseudomonas,and Sphingomonas within the Proteobacteria phylum were greatly enriched after *** analyses revealed the occurrence of 56 species of potential pathogenic bacteria within 17 genera in drinking water,mainly including Pseudomonas fluorescens and five mycobacteria species,which were also persistent in tap water *** bacteria were found to be involved in various pathways,among which considerable groups were related to human diseases,including infectious diseases and even cancers.

关键词： drinking water chlorination bacterial community potential pathogenic bacteria high-throughput sequencing metagenomics

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Moderate Effect of Calcium Peroxide Enhanced Coagulation on Algae Containing Water: Cell Characteristics and Disinfection By-Products Formation

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SSRN 2024年

作者： Liang, Zihan Yang, Shu He, Xin Yin, Chao Zhu, Yiping Xu, Bin Tang, Yulin State Key Laboratory of Pollution Control and Resource Reuse Shanghai East Hospital College of Environmental Science & Engineering Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta Ministry of Water Resources Tongji University Shanghai200092 China Shanghai Chengtou Raw Water Co. Ltd. Shanghai200125 China Guangzhou Water Bureau Guangzhou510610 China

Preserving cellular integrity while eliminating algae cells constitutes a pivotal aspect in the removal of algae within potable water treatment facilities. The effect of calcium peroxide as a pre-oxidizer on water containing Microcystis aeruginosa and its algal removal performance and reaction mechanism were investigated in this study. CaO2 was found to be highly effective in removing algae, requiring only a small amount to eliminate algal cells while preserving their cellular integrity. At 1.0 mM CaO2 dose, algal cell damage rate was 19.2% with mild oxidation and slight damage to cellular integrity. DOC decreased by 75.9% and 13.5% after pre-oxidation and enhanced coagulation at 1.0 mM CaO2, respectively. Higher CaO2 doses improved coagulation and reduced disinfection by-products (DBPs) precursors. Notably, CaO2 was more effective in reducing the formation of carbonaceous disinfection by-products (C-DBPs) compared to nitrogenous disinfection by-products (N-DBPs). The observed discrepancy could be attributed to the heightened reactivity of hydrophobic organic carbon during chlorination or chloramination, resulting in the creation of coagulable C-DBPs. Conversely, the reactive precursors of N-DBPs generally encompass low molecular weight aliphatic amino acids that cannot be efficiently eliminated through coagulation procedures. This study showed that CaO2 had great potential for application in the treatment of algae-containing water. © 2024, The Authors. All rights reserved.

关键词： Cells

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