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8th International Conference on Water Resource and Environment, WRE 2022

作者： Jia, Di Lin, Li Pan, Xiong Dong, Lei Zhang, Sheng Basin Water Environmental Research Department Changjiang River Scientific Research Institute Wuhan430010 China Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province Wuhan430010 China State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing210023 China

ISBN: (纸本)9789819919185

The Hanjiang River occupies a very important position in China's water resource allocation and is a typical dam-influenced river in China. To monitor the water quality and heavy metal content of the river, and to investigate the influence of water hubs on the changes of both, sampling sites were set up in October 2020 upstream, before, and below the dams of three typical water hubs in the middle reaches of the Hanjiang River for analysis and investigation. The results showed that the concentrations of TP, TN, NH4-N, and Fe exceeded the standard;the concentrations of conventional water quality indicators changed significantly (P 0.05). © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Water quality

Dual Role of Trace Bioavailable Co-Substrate in the Intimately Coupled Photocatalysis and Biodegradation (Icpb) System: Enhancing Refractory Organics Mineralization and Nitrate Removal

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SSRN 2025年

作者： Hu, Feng Zhang, Wencan Chen, Peipei Yuan, Zhanzhan Ye, Jianfeng Xu, Zuxin State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji University Shanghai200092 China

Nitrate poses a serious threat to water quality and human health through eutrophication and methemoglobinemia. Conventional biological denitrification is limited in complex wastewater matrices due to the inhibitory effects and low bioavailability of refractory organic pollutants. The Intimately Coupled Photocatalysis and Biodegradation (ICPB) system transforms these recalcitrant compounds into bioavailable electron donors, enabling the simultaneous removal of nitrate and refractory organics. However, when refractory organics serve as the sole carbon source, an imbalance in the carbon-to-nitrogen ratio can lead to pollutant buildup. This study shows that adding a small dose of glucose (50 mg/L COD) to the ICPB system enhances performance by increasing organic mineralization from 53% to 81% and total nitrate and nitrite removal from 40% to 93%. Glucose supplementation improves microbial activity and community composition, optimizing intermediate metabolism and preventing toxic byproduct accumulation without altering pollutant transformation pathways. Metagenomic analysis further indicates that upregulation of the riboflavin biosynthesis pathway enhances electron transfer, thereby boosting system efficiency. Overall, this strategy offers a simple yet effective means to optimize the synergistic removal of refractory organics and nitrate in wastewater treatment. © 2025, The Authors. All rights reserved.

关键词： Glucose

Enhanced Organic Contaminants Degradation Via Coupling Molybdenum Powder with Tripolyphosphate in Fe(Ⅱ)-Based Peroxymonosulfate Activation

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SSRN 2023年

作者： Zhou, Zhengwei Ye, Guojie Zong, Yang Zhao, Zhenyu Xu, Longqian Wu, Deli State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

To overcome the challenges of pH application range, slow cycling of Fe(III)/Fe(II) and low oxidant activation efficiency, we propose a strategy of combining molybdenum powder (Mo) cocatalyst with sodium tripolyphosphate (STPP) to accelerate peroxymonosulfate (PMS) activation and achieve efficient degradation of acetaminophen (ACT). The ACT degradation efficiency and rate were 99.7% and 0.065 min-1, respectively, which were significantly improved compared to the system without Mo due to the abundance of active sites of Mo that accelerate the dissolved Fe species complexed with STPP. Additionally, the degradation efficiency remained above 95%, and there was only a slight change in morphology after 5 cycles, demonstrating the excellent co-catalytic performance and reusability of Mo. The several oxidizing active substances (·OH, SO4·-, 1O2, Fe(Ⅳ)) were synergistically worked for ACT removal, which were investigated the origin and activation mechanism via multiple measures. Satisfactorily, the system exhibited desirable anti-jamming capability and superiority in the removal of various contaminants. ACT degradation intermediate products were measured and proposed three degradation pathways according to the results of Liquid chromatograph-mass spectrometer (LC-MS). The development of combining Mo and STPP for organic pollutant degradation is significant in broadening the application range of PMS-AOPs in environmental remediation. © 2023, The Authors. All rights reserved.

关键词： Degradation

Insight into Enhanced Bromate Photo-Reduction Over Magnetically Recyclable Fe3o4/Tio2/Bi Composites Under Uv Light Irradiation: Performance, Mechanism and Applications

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SSRN 2023年

作者： Xu, Ying Ji, Xingli Li, Lei Li, Ping Zhang, Wei Yu, Shuili State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Research on bromate (BrO3-) removal from drinking water has received much attention recently due to its carcinogenic and genotoxicity. In this study, magnetic Fe3O4/TiO2/Bi composites were synthesized by a simple one-pot solvothermal method to degrade BrO3-. Results showed that over 99% of BrO3- could be removed with a 0.2 g/L dosage of Fe3O4/TiO2/Bi-5% composite in 20 min under UV irradiation at an intensity of 2.3 mW/cm-2 and pH of 7.0 and its removal rate (k = 0.214 min–1) was 13.7 times higher than that of pure TiO2 (k = 0.0156 min–1). On the one hand, adding Fe3O4 particles increased the electrical conductivity of the composites and provided a possible way to recover the composites by magnetic attraction. On the other hand, the loading of bismuth (Bi) enhanced the light absorption of the composite. In addition, Bi acted as hole trapping centers to improve the efficiency of carrier separation and consumed holes by oxidizing Bi0 to Bi3+, thus avoiding the use of hole sacrificial agents. The strong photocatalytic activity was well maintained after the fifth cyclic treatment, indicating both good recoverability and high performance of the novel composites. The efficiency of BrO3- removal in tap water was less than that in deionized (DI) water, mainly due to the consumption of photo-generated electrons by coexisting ions and the adsorption of natural organic matter (NOM) on composites. The enhanced photocatalytic activity and magnetic recyclability made Fe3O4/TiO2/Bi composites a promising candidate for BrO3- removal in drinking water. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

Surface-Air Exchanges of H2s and So2 in an Urban Wetland in Eastern China

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SSRN 2024年

作者： Yu, Qian Wang, Wenjia Chang, Jiale Li, Han Zhang, Zimeng Ke, Piaopiao Duan, Lei Zhang, Lei Zhao, Yu State Key Laboratory of Pollution Control & Resource Reuse School of Environment Nanjing University Nanjing China / Physics Faculty of Science University of Helsinki Helsinki00014 Finland State Key Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing China Nanjing University of Information Science and Technology Nanjing China

Wetlands are widely recognized as major natural sources of hydrogen sulfur (H2S), an important biological sulfur gas that significantly affects atmospheric SO42- aerosol formation and climate change. With the expansion of urban wetlands, it is critical to know the roles that urban wetlands played in atmospheric H2S and SO2 budget. SO2 have higher concentrations in urban regions. In this study, the surface-air exchange fluxes of H2S and SO2 were measured by the Dynamic Flux Chamber (DFC) method in a typical urban wetland in eastern China from Sep 2022 to July 2023. It was found that the urban wetland did not have the expected high H2S emission, might be caused by the relatively high pH value and low sulfate concentration in the wetland. Although H2S showed emission in the daytime of spring and summer, an overall H2S flux of -0.04 kg S ha-1 yr-1 was observed throughout the year. Meanwhile, the urban wetland presented a net sink of SO2, with the deposition reaching 0.14 kg S ha-1 yr-1. The flux of SO2 was significantly negatively correlated with SO2 concentration in the air and negative peaks of SO2 flux corresponded to the suddenly elevated SO2 concentration in the ambient air especially in spring and winter. Through linear fitting of SO2 flux and concentration, the concept of SO2 "compensation point" was proposed. The "compensation point" in summer and autumn were larger, being 2.37 ppb and 1.40 ppb, respectively, and they were 1.07 ppb and 0.86 ppb in spring and winter respectively. The compensation point changed with the season and was related to temperature, and humidity. Our results suggest that the urban wetland expansion may have little risk of increasing air H2S but could act as a significant sink of SO2 with high SO2 concentration in the urban region. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

Improvement of Fe(Ⅲ)/Percarbonate System by Molybdenum Powder and Tripolyphosphate: Co-Catalytic Performance, Low Oxidant Consumption, Ph-Dependent Mechanism

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SSRN 2023年

作者： Zhou, Zhengwei Ye, Guojie Zong, Yang Zhao, Zhenyu Wu, Deli State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

The homogeneous sodium percarbonate (SPC) systems are limited by narrow pH range, ineffective consumption of oxidant, and weak reusability of catalyst. Herein, molybdenum (Mo) powder and sodium tripolyphosphate (STPP) were selected to overcome these challenges. Sulfamethoxazole(SMX), as a model contaminant, was almost completely degraded in 60 minutes with higher removal rate (0.1367 min-1) than the Mo or STPP-absent system. In addition, Mo/STPP-Fe(Ⅲ)/SPC system was cost-effective in terms of oxidant consumption, requiring only 0.2 mM SPC. The main active species for SMX degradation was pH-dependent, with hydroxyl radical (·OH) as the dominant active species at pHi = 7 and ·OH, carbonate radical (CO3·-), and superoxide radical (O2-·) derived from a series of chain reaction at pHi = 10, respectively. Due to the generation of various electrophilic free radical, the system exhibited excellent performance towards electron-rich pollutants under a wide pH range. Furthermore, Mo exhibited excellent stability and reusability. SMX was degraded through hydroxylation, N-S cleavage, amino and sulfanilamide oxidation into intermediates whose toxicities were evaluated by Toxicity Estimation Software Tool (T.E.S.T.) software. This work provided new insights to Fe/SPC system towards high-efficiency and low consumption treatment of practical application. © 2023, The Authors. All rights reserved.

关键词： Reusability

Acceleration of floc-water separation and floc reduction with magnetic nanoparticles during demulsification of complex waste cutting emulsions

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Journal of Environmental Sciences 2020年第3期32卷 80-89页

作者： Yongjiao Xiong Xiangfeng Huang Bin Lu Baoqiang Wu Lijun Lu Jia Liu Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai200092China

Waste cutting emulsions are difficult to treat efficiently owing to their complex composition and stable emulsified *** an important treatment method for emulsions,chemical demulsification is faced with challenges such as low flocs-water separation rates and high sludge ***,in this study,Fe3O4 magnetic nanoparticles(MNPs)were used to enhance chemical demulsification performance for treating waste cutting emulsions under a magnetic *** addition of MNPs significantly decreased the time required to attain sludge-water separation and sludge compression equilibrium,from 210 to 20 *** addition,the volume percentage of sludge produced at the equilibrium state was reduced from 45% to 10%.This excellent flocculation-separation performance was stable over a pH range of *** magnetization of the flocculants and oil droplets to form a flocculant-MNP-oil droplet composite,and the magnetic transfer of the composite were two key processes that enhanced the separation of cutting ***,the interactions among MNPs,flocculants,and oil droplets were important in the magnetization process,which was controlled by the structures and properties of the three *** the magnetic field,the magnetized flocculant-MNP-oil droplet composites were considerably accelerated and separated from water,and the sludge was simultaneously ***,this study expands the applicability of magnetic separation techniques in the treatment of complex waste cutting emulsions.

关键词： Waste cutting emulsion Magnetic nanoparticle Flocculation Separation Acceleration

Biogenic palladium prepared by activated sludge microbes for the hexavalent chromium catalytic reduction: Impact of relative biomass

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Frontiers of Environmental Science & Engineering 2020年第2期14卷 151-159页

作者： Luman Zhou Chengyang Wu Yuwei Xie Siqing Xia State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Palladium,a kind of platinum group metal,owns catalytic capacity for a variety of *** this study,Pd nanoparticles(PdNPs)were generated through enzymatic recovery by microbes of activated sludge at various biomass/Pd,and further used for the Cr(VI)*** results show that biomass had a strong adsorption capacity for Pd(II),which was 17.25 mg Pd/g *** XRD and TEM-EDX results confirmed the existence of PdNPs associated with microbes(bio-Pd).The increase of biomass had little effect on the reduction rate of Pd(II),but it could cause decreasing particle size and shifting location of Pd(0)with the better dispersion degree on the cell *** the Cr(VI)reduction experiments,Cr(VI)was first adsorbed on bio-Pd with hydrogen and then reduced using active hydrogen as electron *** improved the catalytic activity of *** the biomass/Pd(w/w)ratio increased to six or higher,Cr(VI)reduction achieved maximum rate that 50 mg/L of Cr(VI)could be rapidly reduced in one minute.

关键词： Palladium nanoparticles Activated sludge Hexavalent chromium

Simultaneous removal of Cd(II) and phosphate by nanoscale zero-valent iron from solution: Co-sorption and implication of corrosion

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Chemosphere 2024年 364卷 143160页

作者： Fu, Haoyang Sheng, Jie Tang, Chenliu Zhang, Wei-xian Ling, Lan State Key Laboratory for Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China College of Chemical Engineering Beijing University of Chemical Technology Beijing100029 China

Nanoscale zero-valent iron (nZVI) has been extensively utilized in environmental remediation, but its reactivity in the presence of co-contaminants requires further investigation for effective application in complex environments. Here, we conducted batch removal experiments to systematically investigate the co-removal behaviors of Cd(II) and phosphate by nZVI. Results showed that nZVI can synergistically remove Cd(II) and phosphate in solution, with the removal efficiency of Cd(II) and phosphate in the binary system being approximately 2 and 5 times higher than those in the single system, respectively. Sequential removal experiments combined with characterization analysis revealed the co-sorption of Cd(II) and phosphate onto the corrosion product of nZVI mainly by forming the ternary complexes (≡Fe–P–Cd). The Fe(OH)2 formed as the initial nZVI corrosion product provides numerous active sites for immobilization of Cd(II) and phosphate. Such effective co-sorption of Fe(OH)2 inhibits its subsequent phase transformation to Fe3O4. Overall, our work sheds light on how nZVI, Cd(II), and phosphate interact in solution as well as highlights the influence of phase transformation on co-removal, which can broaden the potential applications of nZVI in the practical environment. © 2024 Elsevier Ltd

关键词： Cd(II) Co-removal Phase transformation Phosphate Ternary complexes nZVI

High Performance of Reduced Graphene Oxideand G-C3n4co-Doped Cufe2o4 for Peroxymonosulfate Activation Under Visible Light: Degradation Process of Sulfamethazine Via a Singlet Oxygen Dominated Pathway

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SSRN 2023年

作者： Zhou, Jianzhuo Sun, Qiunan Wang, Xuejiang Liu, Yiyang Xia, Siqing Zhao, Jianfu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Peroxymonosulfate (PMS) activation by heterogeneous metal-based catalysts has been extensively applied for the degradation of organic pollutants in water. However, the catalysts suffer from the low oxidant utilization efficiency, pH limitations and severe matrix interference. Here, a reduced graphene oxide (rGO) and g-C3N4co-doped cooper ferrite (rGO-CNCF) was synthesized and its performance for PMS activation under visible light was evaluated for removal of sulfamethazine. In the condition of rGO-CNCF (0.2g/L) and PMS (0.1g/L), the vis/rGO-CNCF/PMS system could degrade 99.9% of sulfamethazine (SMT, 10 mg/L) within 30 min at pH 7.0, and the system also showed high degrading abilty of SMT over a wide pH range (0-14), along with a good adaptability to common coexisting ions in water solution. The introduction of rGO not only enhanced the stability of rGO-CNCF but also changed the binding sites between PMS and rGO-CNCF which reduced the adsorption energy. Singlet oxygen (1O2) was unveiled to be the major reactive oxygen species (ROS), which was produced by the transformation between negatively charged PMS (HSO5-) and water ,along with the self-degradation of PMS. SMT was decomposed through four degradation pathways in this system, and quantitative structure-activity relationship (QSAR) predictions indicated a significant decrease in its toxicity. Results of this study indicated that the material can efficiently activate persulfate for the removal of organic pollutants from water under visible light conditions and it provided a novel catalytic system for removal of organic contaminants in water. © 2023, The Authors. All rights reserved.

关键词： Organic pollutants