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Seasonal changes of chemodiversity along with microbial succession in a municipal wastewater treatment plant

Journal of environmental Sciences 2025年第4期150卷 318-331页

作者： Yunwei Cui Junya Zhang Luoyao Wen Jibao Liu Zhineng Hao Chunzhong Wei Yanbo Jiang Yuansong Wei Peihong Shen College of Life Science and Technology Guangxi UniversityNanning 530005China State Key Joint Laboratory of Environmental Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Guangxi Beitou Environmental Protection&Water Group Co. LTD.Nanning 530025China

The relationship between chemodiversity and microbial succession in wastewater treatment plants(WWTPs)is highly intricate and *** specific contribution of the microbial community to changes in the composition of dissolved organic matter(DOM)within different biological treatment units remains unclear,as does the reciprocal influence of DOM composition on microbial *** this study,spectroscopy((Excitationemission matrix)EEM-PARAFAC,Ultraviolet(UV)-spectrum,Fourier transform infrared spectrometer(FT-IR)),Liquid chromatograph mass spectrometer(LC–MS)and Fourier transform ion cyclotron resonance(FT-ICR)MS along with high-throughput sequencing technology were used to explore the relationship between chemodiversity and microbial succession in WWTPs concerning seasonal *** results showed that WWTPs with anaerobic/anoxic/oxic(A2O)processes can metabolize and transformmost of thewastewater DOM,and the anaerobic unit has the highest removal rate for fluorescence DOM(FDOM,14.07%-64.43%);the anaerobic unit increased aliphatic/proteins and lignin-like molecules but decreased relative intensity,while the anoxic unit removed unsaturated hydrocarbons,aromatic structures,and lignin-like *** impact of seasonal changes on the composition and removal of FDOM and DOM in wastewater treatment is significant,and the variations that occur during different seasons affect microbial activity,as well as the production,degradation,and transformation of organic compounds throughout thewastewater treatment *** analysis shows that Parcubacteria_genera_incertae_sedis plays a crucial role in DOM chemodiversity,highlighting the crucial contribution of microbial com-munities to both the structure and operation of the entire DOM *** results in this study could provide some theoretical and practical basis for guiding the process optimiza-tion of WWTPs.

关键词： Wastewater treatment plant Dissolved organic matter Fourier transform ion cyclotron resonance mass spectrometry Chemodiversity Microbial community

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Enhanced N2 Production Via Three-Dimensional Electrocatalytic Nitrate Reduction Through Pd-Cu Single Atom on P-Doped Bamboo Activated Biochar

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SSRN 2025年

作者： Zhang, Lihao Wang, Dandan Wu, Yuqing Dong, Yi Zhu, Zongqiang Song, Xiaohong Zhu, Yinian Liang, Meina College of Environmental Science and Engineering Guilin University of Technology Guangxi Guilin541006 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guangxi Guilin541006 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Areas Guangxi Guilin541006 China

In order to effectively deal with nitrate nitrogen pollution and other problems in underground water, a phosphorus (P) doped carbon palladium/copper (Pd/Cu) monatomic catalyst (Pd-Cu-P-BC) of bamboo was prepared by "calcination pyrolysis reduction" and other methods. The effect of its collaborative three-dimensional electrocatalytic system on the removal of nitrate nitrogen (NO3-N) in water was investigated. The results showed that the P-doped metal Pd and Cu were uniformly dispersed in the biocarbon structure. Using it as a three-dimensional particle electrode, the removal rate of NO3-N in water by the collaborative two-dimensional electrocatalytic system can reach more than 99%, which is 13.68 times higher than that of the traditional two-dimensional electrocatalytic reduction system and adsorption system. After 3 hours of reaction, the N2 generation rate reached 46.68%, and the support energy of the intermediate *N combined with other intermediates to generate *N2 was 8.32 eV. The removal rate of NO3-N, the production rate of N2 and the catalytic activity of the catalyst can still maintain a high stability after three cycles of reuse. The results of density functional theory revealed that phosphorus doping introduced oxygen atoms and introduced many defect sites into the biological carbon material, causing the geometric structure of the catalyst to show a certain degree of curvature and bending, and the defect site directly acted as the catalytic active site, affecting the catalytic activity and selectivity of the catalyst. The utilization of bimetallic monatomic catalysts as three-dimensional particle electrodes for the electrocatalytic reduction of nitrate in water presents promising application advantages and prospects. These catalysts offer exceptional potential in enhancing the efficiency and selectivity of nitrate reduction processes. © 2025, The Authors. All rights reserved.

关键词： Groundwater pollution

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Effects of biochar on rainwater redistribution, soil water evaporation and desiccation cracking: A case study of limestone soil in karst areas of southwest China

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Science of the Total Environment 2025年 965卷 178692页

作者： Si, Dantong Lin, Yuze Xu, Qinxue Zhang, Shuaipu Engineering Research Center of Watershed Protection and Green Development University of Guangxi Guilin University of Technology Guilin541006 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541006 China

Soil desiccation cracking, which leads to increased water loss and the destruction of soil integrity, can significantly exacerbate drought conditions and soil degradation. Biochar derived from organic waste can effectively reduce soil desiccation cracking as a sustainable soil amendment. However, the effects of biochar on the entire process of rainfall infiltration, soil water evaporation, and subsequent desiccation cracking remain unclear. In this study, simulated rainfall-evaporation experiments were conducted on limestone soil in karst areas with severe water leakage and susceptibility to cracking, using improved soil with corn straw biochar (CSB), rice husk biochar (RHB), and bagasse biochar (BB) at 0 %, 2 %, 4 %, and 6 % application rates, respectively. Surface runoff (SR) and underground percolation (UP) were collected during rainfall events, whereas soil water storage (SWS) was measured after the rainfall events. Each sample was weighed at intervals during evaporation (3–5 days) to monitor the soil water content, and the corresponding crack morphology was photographed. The results indicated that SWS increased by 6.23 %–35.14 % while UP decreased by 11.39 %–49.95 % for the different types of biochar compared to the control. Biochar application increased the evaporation rate, but reduced the evaporation loss rate of soil water, allowing the soil to maintain a high water content for a longer evaporation period. The application of biochar inhibited crack propagation and reduced the final cracking degree, particularly when BB was applied. The biochar-amended soil had a smaller had lower crack ratio (Rcr), mean crack width (wcr), box-counting fractal dimension (Db), and crack network connectivity (Cnet) compared to the control. Based on our results, we suggest the application of 6 % CSB or BB to limestone soils in karst areas. This study provides a scientific basis for the use of biochar to increase soil water content and minimise cracking. © 2025 Elsevier B.V.

关键词： Limestone

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Isolated FeN_(3)sites anchored hierarchical porous carbon nanoboxes for hydrazine-assisted rechargeable Zn-CO_(2)batteries with ultralow charge voltage

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Carbon Energy 2025年第1期7卷 121-132页

作者： Sanshuang Gao Hongyi Li Zhansheng Lu Songjie Meng Xue Zhao Xinzhong Wang Xijun Liu Guangzhi Hu Shenzhen Institute of Information Technology Shenzhen 518172China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Ecology and Environmental Science Institute for Ecological Research and Pollution Control of Plateau LakesYunnan UniversityKunming650504China State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of ChemistryXinjiang UniversityUrumqiChina School of Physics Henan Normal UniversityXinxiangChina Faculty of Chemistry and Chemical Engineering Yunnan Normal UniversityKunmingChina

Zn-CO_(2)batteries(ZCBs)are promising for CO_(2)conversion and electric energy ***,the ZCBs couple the electrochemical CO_(2)reduction(ECO_(2)R)with the oxygen evolution reaction and competitive hydrogen evolution reaction,which normally causes ultrahigh charge voltage and CO_(2)conversion efficiency attenuation,thereby resulting in~90%total power ***,isolated FeN_(3)sites encapsulated in hierarchical porous carbon nanoboxes(Fe-HPCN,derived from the thermal activation process of ferrocene and polydopamine-coated cubic ZIF-8)were proposed for hydrazine-assisted rechargeable ZCBs based on ECO_(2)R(discharging process:CO_(2)+2H+→CO+H_(2)O)and hydrazine oxidation reaction(HzOR,charging process:N_(2)H4+4OH−→N_(2)+4H_(2)O+4e^(−)).The isolated FeN_(3)endows the HzOR with a lower overpotential and boosts the ECO_(2)R with a 96%CO Faraday efficiency(FECO).Benefitting from the bifunctional ECO_(2)R and HzOR catalytic activities,the homemade hydrazine-assisted rechargeable ZCBs assembled with the Fe-HPCN air cathode exhibited an ultralow charge voltage(decreasing by~1.84 V),excellent CO selectivity(FECO close to 100%),and high 89%energy *** situ infrared spectroscopy confirmed that Fe-HPCN can generate rate-determining*N_(2)and*CO intermediates during HzOR and ECO_(2)*** paper proposes FeN_(3)centers for bifunctional ECO_(2)R/HzOR performance and further presents the pioneering achievements of ECO_(2)R and HzOR for hydrazine-assisted rechargeable ZCBs.

关键词： electrochemical CO_(2)reduction Fe single atoms hierarchical porous carbon nanoboxes hydrazine-assisted Zn-CO_(2)batteries hydrazine oxidation reaction

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Strategies for Enhancing Direct Interspecies Electron Transfer Induced by Granular Activated Carbon During Anaerobic Digestion of Fat, Oil, and Grease

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SSRN 2025年

作者： He, Xia Chen, Jieying Xu, Weijia Lu, Yanqin College of Environmental Science and Engineering Guilin University of Technology Guangxi541006 China Modern Industry College of Ecology and Environmental Protection Guilin University of Technology Guilin541006 China Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of Technology Guilin541006 China

Adsorption of long chain fatty acids (LCFAs) on granular activated carbon (GAC) limits the establishment of direct interspecies electron transfer (DIET) via GAC during anaerobic digestion of fat, oil, and grease (FOG). Exploration of strategies for enhancing GAC-induced DIET for LCFAs degradation is vital for the application of GAC in FOG digestion. In this study, the influence of different strategies, combined with pre-mixing GAC with inoculum, inoculum acclimation, and inoculum size differentiation, on the enhancement of GAC-induced DIET was investigated. The results show that pre-mixing GAC with the large size acclimatized inoculum was the optimal strategy to reduce LCFAs adsorption on GAC and enhance GAC-induced DIET for LCFAs degradation, leading to 63.4% increment of methane production compared to the control. Using the optimal strategy, Exilispira, Geobacter, Methanosaeta, Methanolinea, and RBG-16-49-21 were highly enriched and cooperatively interacted on GAC, contributing to the enhanced acetate/propionate degradation and nitrogen conversion to accelerate LCFAs degradation. This simultaneously reduced the inhibitory effect of LCFAs in the digester, changed the microbial composition and the network of the suspended sludge, benefiting the methane production by suspended sludge. Overall, this work provides an in-depth understanding of the enhancement of GAC-induced DIET during FOG digestion. © 2025, The Authors. All rights reserved.

关键词： Anaerobic digestion

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N-Nitrosamines in Karst Groundwaters in Southwestern China: Risks and Implications for Drinking Water Safety

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SSRN 2025年

作者： Gu, Xiongwei Xu, Liwei Huang, Xin Chen, Yingjie Shan, Yuanyu Yan, Xiaoyu Liu, Zhaojue Zeng, Hong-Hu Chen, Wenwen Huang, Huanfang Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541006 China Engineering Research Center of Watershed Protection and Green Development University of Guangxi Guilin University of Technology Guilin541006 China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences MEE Guangzhou510535 China SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment South China Normal University Guangzhou510006 China

Groundwater is a vital drinking water source for populations in remote karst regions. However, the highly developed karst tube systems facilitate the infiltration of surface wastewater containing N-nitrosamines, raising concerns about groundwater safety. To assess the safety of groundwater and identify which types are safer for consumption, this study investigated N-nitrosamines in various groundwater types, including ground river, karst cavern, well, and mountain spring waters, in guangxi, a typical karst region in southwestern China. The total concentrations of eight N-nitrosamines in groundwater ranged from 5.1 to 70.3 ng/L, with N-nitrosodiethylamine (NDEA), N-nitrosodimethylamine (NDMA), and N-nitrosopyrrolidine (NPYR) being the dominant species. Ground river water exhibited significantly higher N-nitrosamine concentrations than karst cavern, well, and mountain spring waters. Significant correlations between N-nitrosamines and dissolved inorganic nitrogen suggested their co-emissions from domestic wastewater and the secondary formation potential of N-nitrosamines in groundwater. Redundancy analysis further identified domestic and swine wastewater as the primary sources. Ground river and mountain spring waters posed the highest risks among the four groundwater types, with 30% and 20% of sites, respectively, exceeding acceptable cancer risk thresholds. These findings underscore the importance of thorough water treatment before groundwater is used for drinking. Strict livestock farming and domestic wastewater discharge regulations are essential to mitigate contamination risks, particularly in karst areas. © 2025, The Authors. All rights reserved.

关键词： Nitrosamines

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Enhancement of aluminum doping on removal of norfloxacin by iron-loaded biochar: efficacy and mechanism

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environmental Research 2025年 279卷 121723页

作者： Hu, Tianyou Chen, Zhili Xu, Yufeng Liu, Liheng College of Environmental Science and Engineering Guilin University of Technology Guilin541006 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541006 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin541006 China Modern Industry College of Ecology and Environmental Protection Guilin University of Technology Guilin541006 China

The capacity of aluminum/iron-loaded biochar (AFBC) and iron-loaded biochar (FBC) for removal of norfloxacin (NOR) was investigated by batch experiments, while enhancement efficacy and mechanism was explored by kinetic, isothermal, and thermodynamic analyses, as well as by characterization of the AFBCs and FBCs and solution properties. As the initial pH was raised from 2 to 12, the NOR removal capability of AFBC varied within a narrow range (123.6–124.4 mg g−1), which was 2.06–2.53 times that of FBC. The better description of the pseudo-second-order kinetic model, liquid film diffusion model, and Langmuir model indicated that NOR removal was dominated by surface monolayer chemisorption, and its rate-controlling step was mainly liquid film diffusion. Liquid film diffusion rates of AFBC and FBC were 7.01 × 10−2 and 1.75 × 10−2 min−1, whereas their maximum q-values were 205.8/72.77 (298 K), 222.9/84.42 (308 K), and 235.3/95.25 mg g−1 (318 K), respectively. NOR removal was spontaneous and endothermic, while more negative Gibbs energy change and lower enthalpy change of AFBC suggested that it was more beneficial for NOR removal. Adsorption and degradation of AFBC and FBC contributed 53.07 %/46.93 % and 61.76 %/38.24 % to NOR removal (298 K). The amounts of adsorption sites and free radicals (1O2, ·OH and ·SO4) derived from AFBC were 2.43 and 3.47 times those of FBC, respectively. AFBC and FBC had three similar pathways for degrading NOR, while AFBC significantly enhanced the contributions of ·OH and ·SO4. Furthermore, AFBC and FBC could be effectively desorbed and regenerated by ultrapure water and NaOH. In conclusion, the enhancement of NOR removal by aluminum doping on iron-loaded biochar was attributed to the elevation of affinity and the provision of more adsorption sites and free radicals. © 2025 Elsevier Inc.

关键词： Gibbs free energy

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Potential Toxic Elements (Ptes) in the Surface Sediments of Beibu Gulf, South China Sea: Spatiotemporal Variation, Geochemical Fractionation and Ecological Risk Assessment

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SSRN 2025年

作者： Yang, Xuewen Su, Qiongyuan Huang, Liangliang Wen, Caixia Shahab, Asfandyar Wang, Caiguang Li, Nan Kang, Bin College of Environmental Science and Engineering Guilin University of Technology Guangxi Guilin541004 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science Guangxi Guilin541004 China Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Areas Guangxi Guilin541004 China Scientific Research Academy of Guangxi Environmental Protection Guangxi Nanning530022 China College of Fisheries Guangdong Ocean University Guangdong Zhanjiang524088 China College of Fisheries Ocean University of China Shandong Qingdao266100 China

Surface sediment samples from three different depth groups were collected in the Beibu Gulf during spring and summer to determine the fractions, potential toxicity, and associated risks of eight potential toxic elements (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn). Temporally, the results demonstrated that the average concentration of As was higher in spring than the one in summer, while the concentrations of other elements were higher in summer, especially for Zn. Spatially, the T1 group (Depth: © 2025, The Authors. All rights reserved.

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environmental concentrations of N-nitrosodiethylamine (NDEA) disturb the Ca^2 + and K⁺ homeostasis in the gills and epidermis of mosquitofish (Gambusia affinis)

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Ecotoxicology and environmental Safety 2025年 294卷 118067页

作者： Yan, Xiaoyu Chen, Wenwen Song, Xiaohong Ma, Yun Wang, Haiqin Yang, Tao Liang, Yanpeng Zeng, Honghu The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of Technology Guilin 541006 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin 541006 China Key Laboratory of Carbon Emission and Pollutant Collaborative Control Guilin University of Technology Guilin 541006 China

N-nitrosodiethylamine (NDEA), a nitrogenous disinfection by-product, is notorious for its ubiquitous presence in the environment and its carcinogenic properties. However, its impact on ion homeostasis in aquatic organisms remains underexplored. In the present study, we investigated the effects of NDEA on ion homeostasis in mosquitofish exposed to varying concentrations for 30 days. Calcium and potassium fluxes were monitored using noninvasive micro-test technology (NMT), and ATPase activities and gene expressions related to ion transport and immune responses were assessed. Principal component analysis was conducted to identify the organs most sensitive to different NDEA exposure levels. The results revealed that NDEA exposure inhibited transport enzyme activities and affected the expression of ion transport- and immune-related genes. Among all tested tissues, the gills exhibited the highest overall sensitivity (0.443) to NDEA exposure, underscoring their essential functions in ion transport and calcium regulation. These findings underscore the critical role of ion homeostasis in NDEA-induced toxicity and highlight the importance of understanding tissue-specific responses in assessing the ecological risks posed by N-nitrosamines in aquatic environments. © 2025 The Authors

关键词： Ca2+ and K+ homeostasis Ion transmembrane transport Mosquitofish N-nitrosodiethylamine Pathological alterations

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A Review of the Sources, Monitoring, Detection, and Removal of Typical Olfactory Substances Geosmin and 2-Methylisoborneol

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Water (Switzerland) 2025年第8期17卷 1236-1236页

作者： Wang, Mingyang Xu, Yufeng Xie, Yiping Yang, Liu Zhang, Jun Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541006 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin541006 China Modern Industry College of Ecology and Environmental Protection Guilin University of Technology Guilin541006 China University Engineering Research Center of Watershed Protection and Green Development Guilin University of Technology Guilin541006 China

As the key sensory indicators for drinking water quality evaluation, the odor problems caused by geosmin (GSM) and dimethylisobornyl alcohol (2-MIB) have led to several major water supply crises around the world. In this paper, the theoretical framework of the whole process control of olfactory substances is systematically constructed through innovative research from multiple perspectives, and the main contributions are as follows: a comprehensive analysis of the sources of GSM and 2-MIB;an innovative summary of the monitoring methods of cyanobacteria and elaboration on the ways of controlling cyanobacteria in the water source;a comprehensive combing of the methods of olfactory substance detection technology, mainly the application of the new sensor technology;an in-depth summary of the techniques of olfactory removal;an analysis of the problems of the traditional water treatment technology;an analysis of the development and application of the new sensor technology, analyzing the advantages and disadvantages of traditional water treatment technology and classifying and elaborating on advanced oxidation processes (AOPs);and suggestions for the future research direction of each segment. © 2025 by the authors.

关键词： Computer control

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