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SSRN 2023年

作者： Liu, Huanying Zeng, Yiwei Chen, Wenwen Liu, Chuanqi Sun, Dezhi Hu, Zhen Li, Pengsong Xu, Haiyu Wu, Hongbin Qiu, Bin Liu, Xinying Dang, Yan Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China School of Environmental Science & Engineering Shandong Key Laboratory of Water Pollution Control and Resource Reuse Environment Research Institute Shandong University Qingdao266237 China Technology Co. Ltd Shanghai201800 China

Microbial electrosynthesis (MES) offers a promising approach for converting CO2 into valuable chemicals such as acetate. However, the relative low conversion rate severely limits its practical application. This study investigated the impact of different hydrogen evolution rates on the conversion rate of CO2 to acetate in the MES system. Three potentials (-0.8 V, -0.9 V and -1.0 V) corresponding to various hydrogen evolution rates were set and analyzed, revealing an optimal hydrogen evolution rate, yielding a maximum acetate formation rate of 1410.9 mg/L and 73.5% coulomb efficiency. The electrochemical findings revealed that an optimal hydrogen evolution rate facilitated the formation of an electroactive biofilm. The microbial community of the cathode biofilm highlighted key genera, including Clostridium and Acetobacterium, which played essential roles in electrosynthesis within the MES system. Notably, a low hydrogen evolution rate failed to provide sufficient energy for the electrochemical reduction of CO2 to acetate, while a high rate led to cathode alkalinization, impeding the reaction and causing significant energy wastage. Therefore, maintaining an appropriate hydrogen evolution rate is crucial for the development of mature electroactive biofilms and achieving optimal performance in the MES system. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Pretreatment of High Salinity Naproxen Pharmaceutical Workshop Wastewater with O3-H2o2 Process: Performance and Mechanisms

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SSRN 2023年

作者： Feng, Xianlu Shi, Jinyu Bi, Siqi Zhao, Pengsha Sun, Dezhi College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and Eco-remediation Beijing Forestry University Beijing100083 China Beijing100085 China

In this study, a combined O3-H2O2 process was used to efficiently pretreat high-salinity naproxen pharmaceutical workshop wastewater (NPWW). The synergistic effect of O3 and H2O2 made the decolorization rate, COD, TOC and NPX removal rate of NPWW 82.11%, 51.33%, 34.10% and 95.33% respectively. The addition of H2O2 resulted in a 14.16% increase in the O3 utilization efficiency. The biodegradability improved and its mutagenic effect reduced after oxidation. The oxidation efficiency was affected by the dosages of O3/H2O2 and the kind of anions, and acidic conditions were not conducive to the degradation of organic compounds by O3-H2O2. The degradation sensitivity of fluorescent organic compounds in NPWW was in the order of fulvic acid-like substances > tryptophan-like substances > tyrosine-like substances. This process could degrade aromatic organic compounds into intermediates with simple structure through chain breaking, ring opening and oxygenation. The treated NPWW mainly contained small molecular organic compounds with molecular weight ranging from 2000 to 4000 Da. After oxidation, the aromatic degree, unsaturation and polarity of NPWW decreased, and the oxidizability increased. The DOM removal rate in O3-H2O2 was 32.82%, and 70.95% of the molecules were reactive molecules. Additionally, the oxidation efficiency of the system was affected by free-radical and non-free-radical pathways. Overall, this study analyzed the mechanisms governing the degradation of refractory organic compounds and generation of free radicals during O3-H2O2 treatment, providing technical support for practical NPWW treatment. © 2023, The Authors. All rights reserved.

关键词： Free radicals

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Enhanced Catalytic Oxidation of Toluene with a Mnox/Copper Mesh Monolithic Catalyst Prepared Using One-Step Electrodeposition Method

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SSRN 2024年

作者： Zhang, Yue Gao, Yanshan Wang, Qiang Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry University Beijing100083 China

Catalytic combustion is a highly efficient technology for reducing VOCs, and the development of monolithic catalysts with superior catalytic activity suitable for industrial applications is crucial. In this study, a novel MnOx/copper mesh (CM) monolithic catalyst was prepared for toluene oxidation using a one-step electrodeposition method. The effect of deposition conditions on the catalytic performance of MnOx/CM monolithic catalysts was systematically investigated by varying the deposition time, electrolyte concentration and deposition voltage. Due to good low-temperature reducibility and higher Mn4+ and Olatt content, the T50% and T90% of 1.24-0.2 MnOx/CM-60 catalyst could reach 229 oC and 242 oC, respectively. Furthermore, the catalyst exhibited excellent water tolerance, cycling and long-term stability. In-situ DRIFTS analysis confirmed a possible degradation pathway in which lattice oxygen in the catalyst oxidized the adsorbed toluene molecules to form intermediates (benzyl alcohol and benzoate). Subsequent replenishment of gaseous oxygen (involving oxygen vacancy creation-disappearance) led to aromatic ring breakage and the intermediates were further oxidized to maleate and finally to CO2 and H2O. This study provides a reference for the in-situ construction of low-cost metal-based monolithic catalysts for VOCs catalytic oxidation. © 2024, The Authors. All rights reserved.

关键词： Electrodeposition

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Enhancement of Nitrogen Removal in Coupling Anammox and Damo Via Fe-Modified Granular Activated Carbon

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SSRN 2023年

作者： Xue, Yiting Liu, Xinying Dang, Yan Shi, Tianjing Sun, Dezhi Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Environmental Monitoring Station Ningdong Energy Chemical Industry Base Yinchuan751400 China

Anaerobic ammonium oxidation (Anammox) coupling to Denitrifying anaerobic methane oxidation (DAMO) is an attractive technology to simultaneously remove nitrogen and mitigate methane emissions from wastewater, however, its nitrogen removal rate is usually limited due to the low methane mass transfer efficiency, low metabolic activity and slow growth rate of functional microorganisms. In this study, GAC and Fe modified GAC (Fe-GAC) were added into Anammox-DAMO process to investigate their effects on nitrogen removal rates and then reveal the mechanism. The results showed that after 80-day experiments, the total nitrogen removal rate was slightly improved in the presence of GAC (3.94 mg·L-1·d-1), while it reached high as 16.66 mg·L-1·d-1 in the presence of Fe-GAC, which was ca.17 times that of non-amended control group (0.96 mg·L-1·d-1). The addition of Fe-GAC stimulated the secretion of extracellular polymeric substance (EPS), improved the electron transfer capability and promoted the production of Cytochrome C. Besides, the key functional enzyme activities (HZS, HDH and NAR) were highest in the Fe-GAC group, which were approximately 1.06~1.56 times higher than those of GAC-amended and blank groups. Microbial community analysis showed that the abundance of the DAMO archaea (Candidatus Methanoperedens) and Anammox bacteria (Candidatus Brocadia) were remarkably increased with the addition of Fe-GAC. Functional genes associated with nitrogen removal and methane oxidation in Fe-GAC system were up-regulated. This study provides a promising strategy for high rate of nitrogen removal upon Anammox-DAMO process. © 2023, The Authors. All rights reserved.

关键词： Nitrogen removal

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Remote Sensing Assessment of Ecological Quality of Baiyangdian Wetland in Response to Extreme Rainfall

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SSRN 2024年

作者： Luo, Hongxing Xu, Yanmei Han, Qi Zhang, Liqiu Feng, Li Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Engineering Research Center for Water Pollution Source Control and Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China College of Landscape Architecture Beijing Forestry University Beijing100083 China

As global warming intensifies, extreme weather has become one of the major challenges threatening the ecological environment. Baiyangdian Wetland is the largest freshwater wetland in northern China, studying how the wetland responds to extreme weather events is of great importance for ecological conservation and policymaking. By using Google Earth Engine (GEE), this study merges Landsat 8 and 9 data to obtain cloud-free remote sensing images closest to the extreme rainstorm that occurred from July 29 to August 2, 2023, and quantifies the eco-environmental quality by a newly emerging index WBEI (water benefit-based ecological index) with the comparison of the widely used RSEI (remote sensing-based ecological index);and then conducts spatial autocorrelation analysis to reveal the spatial heterogeneity of eco-environmental quality in the study area. The results showed that the WBEI and RSEI decreased from 0.50 to 0.44 and from 0.68 to 0.64, respectively. The global Moran's index varies from 0.681 to 0.801, demonstrating a positive correlation in the spatial distribution characteristics of eco-environmental quality. The two indices enable convenient quantification of eco-quality, and both captured the apparent deterioration of the ecosystem after the strike of extreme rainfall. However, by incorporating the ecological benefits of waterbodies, the WBEI demonstrates superior generalizability in evaluating the eco-quality of wetland ecosystems. Additionally, the High-High cluster in the Zaozhadian area disappeared after the extreme rainfall suggesting that the ecological resilience of the returning farmland to wetland area was lower than the natural wetland. © 2024, The Authors. All rights reserved.

关键词： Remote sensing

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Effect of anaerobic digested sludge biochar on soil quality improvement: An insight into mechanisms, microbial composition, and toxicity risk assessment

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Chemosphere 2025年 370卷 143948页

作者： Li, Zhuo Hafeez, Farhan Zhang, Jing Chen, Kai Zeng, Bizhen Qi, Feilan Yang, Lan Zhu, Hongtao Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China Offshore Environmental Technology & Services Limited Beijing100020 China Abbottabad Campus Abbottabad22060 Pakistan China Institute of Water Resources and Hydropower Research Beijing100038 China College of Environment and Resources Chongqing Technology and Business University Chongqing400067 China

Biochar is widely acknowledged for its remarkable impact on soil conditioning. However, the influence of different sources of biochar, particularly anaerobic digested sludge biochar (ADBC) derived from anaerobic digested sludge and biochar derived from waste activated sludge, on alkaline soil remains largely unexplored. To address this knowledge gap, a comprehensive field experiment was conducted over a period of 180 days to investigate the effects of ADBC on slightly alkaline soil. This study evaluated various aspects, including soil properties, nutrient content, microbial composition, and soil toxicity. The results demonstrated significant improvements in the quality of alkaline soil following the application of ADBC. Notably, soil pH decreased from 8.24 to 7.5, while conductivity increased from 56.7 μs/cm to 249.0 μs/cm, total organic carbon from 13.5 g/kg to 19.9 g/kg, available nitrogen from 45.5 g/kg to 237.5 g/kg, and available phosphorus from 549.5 g/kg to 1396.7 g/kg. Moreover, ADBC substantially increased the relative abundance of functional bacteria associated with nutrient cycling, such as Proteobacteria, Actinobacteriota, and Bacteroidota. Conversely, the assessment of biotoxicity revealed a decrease in toxicity with increasing preparation temperature and particle size. These findings highlight the promising potential of ADBC for improving the key properties of alkaline and nutrient-poor soils crucial for overall soil productivity. © 2024 Elsevier Ltd

关键词： Alkaline soil Biochar Anaerobic digested sludge Nutrient boost Bacterial community Toxicological analysis

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Long-term performance on volatile fatty acids production improved in a kitchen wastewater fermenter by co-fermentation of sludge and membrane separation

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Chemosphere 2023年第1期335卷 139049页

作者： Huang, Jianghao Chen, Kai Xia, Xiaodong Zhu, Hongtao Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China Power China Guizhou Electric Power Design & Research Institute Co. LTD Guiyang550002 China

Kitchen wastewater can be transformed into a valuable resource through anaerobic fermentation. However, the efficiency of this process is hindered by various factors including salt inhibition and nutrient imbalance. In this study, we examined the effects of co-fermentation with sludge and membrane filtration on the anaerobic fermentation of kitchen wastewater. Our findings indicate that co-fermentation with sludge resulted in a 4-fold increase in fermentation rate and a 2-fold increase in short-chain fatty acids (SCFAs) production. This suggests that the addition of sludge helped to alleviate salt and acid inhibition through ammonia buffering and elemental balancing. The membrane filtration retained 60% of soluble carbohydrates and 15% of proteins in the reactor for further fermentation and recovered nearly 100% of NH4+ and SCFAs in the filtrate, which helped to alleviate acid and ammonia inhibition. The combined fermentation system significantly increased the richness and diversity of microorganisms, particularly caproiciproducens and Clostridium_sensu_stricto_12. The membrane flux remained stable and at a relatively high level, indicating that the combined process may be economically feasible. However, scaling up the co-anaerobic fermentation of kitchen wastewater and sludge in a membrane reactor is necessary for further economic evaluation in the future. © 2023 Elsevier Ltd

关键词： Bioreactors

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Insights into photocatalytic mechanism over a novel Cu_(2)WS_(4)/MoS_(2) S-scheme heterojunction

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Rare Metals 2024年第7期43卷 3118-3133页

作者： Wei Zhao Ji-Hui Cao Jun-Jie Liao Yun Liu Xiao-Jun Zeng Jun-Yu Shen Xue-Kun Hong Yang Guo He-Hua Zeng Ya-Zi Liu School of Materials Engineering Jiangsu Key Laboratory of Advanced Functional MaterialsSchool of Electronic and Information EngineeringChangshu Institute of TechnologyChangshu215500China School of Chemistry and Chemical Engineering Changji UniversityChangji 831100China State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Ministry of Ecology and EnvironmentNanjing Institute of Environmental SciencesNanjing 210023China School of Environment Jiangsu Engineering Lab of Water and Soil Eco-RemediationNanjing Normal UniversityNanjing 210023China Department of Chemical Engineering Curtin UniversityPerthWA6845Australia

A novel efficient Cu_(2)WS_(4)/MoS_(2) step-scheme(S-scheme)heterojunction photocatalyst was constructed for the first time and applied in the removal of environmental *** the as-prepared photocatalysts,the Cu_(2)WS_(4)/MoS_(2)-8%heterojunc tion photoc atalyst demonstrates the optimal photocatalytic performance,with the catalytic oxidation efficiency of tetracycline(TC)and the catalytic reduction efficiency of Cr^(6+)reaching 93.3%and 82.1%,*** excellent catalytic properties of Cu_(2)WS_(4)/MoS_(2) heterojunction photocatalysts are attributed to the effective separation pathways of charges and the presence of S-scheme heterojunctions,together with stronger redox *** is speculated that the photogenerated carrier migration path of the Cu_(2)WS_(4)/MoS_(2) catalyst follows the typical S-scheme photocatalytic mechanism,which is verified by the in-depth experimental study and simulated calculations including the electron paramagnetic resonance(EPR)analysis,free radical quenching experiments,charge density distribution,and simulated built-in electric field formation at the interface,which acts as driving force to promote the separation of photoinduced electrons and ***,the photocatalytic mechanism of S-scheme photogenerated carrier migration for the Cu_(2)WS_(4)/MoS_(2) catalyst is revealed based on the systematic experimental techniques and simulated calculations,accounting for its superior photocatalytic oxidation and reduction *** study provides inspiring implications to develop high-efficient S-scheme photocatalytic systems for versatile applications in solarenergy conversion.

关键词： Cu_(2)WS_(4)/MoS_(2) S-scheme Heterojunction Photocatalysis

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O2 plasma-modified carbon nanotube for sulfamethoxazole degradation via peroxymonosulfate activation: Synergism of radical and non-radical pathways boosting water decontamination and detoxification

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Chemosphere 2023年 344卷

作者： Liu, Shiqi Zhang, Zichen Lu, Rui Mao, Yuankun Ge, Huiru Liu, Can Tian, Chenxi Yin, Siyuan Feng, Li Liu, Yongze Chen, Chao Zhang, Liqiu Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Technical Center of Solid Waste and Chemicals Management Ministry of Ecology and Environment Beijin100029 China

Sulfamethoxazole (SMX), a widely used antibiotic, has triggered increasing attention due to its extensive detection in wastewater effluent, causing serious ecological threats. Herein, a carbon-based heterogeneous catalyst was developed by the O2 plasma-etching process, regulating oxygen-containing functional groups (OFGs) and defects of carbon nanotubes (O-CNT) to activate peroxymonosulfate (PMS) for highly efficient SMX abatement. Through adjusting the etching time, the desired active sites (i.e., C=O and defects) could be rationally created. Experiments collectively suggested that the degradation of SMX was owing to the contribution of synergism by radical (•OH (17.3%) and SO4•– (39.3%)) and non-radical pathways (1O2, 43.4%), which originated from PMS catalyzed by C=O and defects. In addition, the possible degradation products and transformation pathways of SMX in the system were inferred by combining the Fukui function calculations and the LC-MS/MS analysis. And the possible degradation pathway was effective in reducing the environmental toxicity of SMX, as evidenced by the T.E.S.T. software and the micronucleus experiment on Vicia faba root tip. Also, the catalytic system exhibited excellent performance for different antibiotics removal, such as amoxicillin (AMX), carbamazepine (CBZ) and isopropylphenazone (PRP). This study is expected to provide an alternative strategy for antibiotics removal in water decontamination and detoxification. © 2023 Elsevier Ltd

关键词： Carbon nanotubes

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Rapid Removal of Low-Level Phosphate by La-Cit Hybridized with Fe₃O₄: Performance and Mechanism Analysis

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SSRN 2025年

作者： Hao, Haotian Huang, Xu Zhang, Yao Xu, Shuo Wang, Yili Shi, Baoyou Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China

The effective elimination of low-level phosphate from aqueous systems is critical for mitigating eutrophication and enhancing aquatic ecological sustainability. In this study, a regenerable magnetic composite, designated as MLCit, was synthesized via an in-situ embedding method. This composite integrates a novel phosphate-binding lanthanum citrate complex (La-Cit) with Fe₃O₄ nanoparticles to achieve efficient phosphate removal. Comparative analysis revealed that MLCit exhibits enhanced adsorption performance relative to four other magnetic lanthanum-based composites (La3+/Fe3O4, La2(CO3)3/Fe3O4, La(OH)3/Fe3O4, and La2O3/Fe3O4). Specifically, MLCit demonstrated a phosphate adsorption capacity 1.5–9 times higher than these counterparts, with an initial adsorption rate 1.46–2.22 times greater. Structural characterization confirmed that MLCit-41 (La/Fe molar ratio = 4:1) adopts a core-shell structure, comprising Fe3O4 nanoparticles encapsulated by amorphous La-Cit. The maximum adsorption capacity of MLCit-41 reached 77.85 mg P/g, with equilibrium achieved within 3 h at a dosage of 0.5 g/L. MLCit-41 exhibited broad pH applicability (4–11), exceptional selectivity for phosphate, and achieved residual phosphate concentrations below 0.05–0.1 mg P/L in four environmental water samples (TP © 2025, The Authors. All rights reserved.

关键词： Eutrophication

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