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Under-reporting potential of inoxidizable nitrogenous organic compounds in assessing organic pollution of waters: Underlying mechanisms

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Fundamental Research 2023年

作者： Li, Zhouyan Ma, Jinxing Dai, Ruobin He, Yuxiang Shi, Wei Wang, Zhiwei State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security Tongji Advanced Membrane Technology Center School of Environmental Science and Engineering Tongji University Shanghai 200092 China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou 510006 China

Accurate assessment of organic pollution plays a vital role in environmental protection, administration, and legislation. Methodology involving the evaluation of dichromate-based chemical oxygen demand (COD_Cr) has been widely used for assessing organic pollution in water due to convenience, simplicity, and repeatability. Some nitrogenous organic compounds exhibit very low COD_Cr / theoretical oxygen demand (ThOD) ratios, which are termed inoxidizable nitrogenous organic compounds (INOCs) in this study. However, not much attention has been paid to their ubiquitous presence and intrinsic properties. Here, we aimed to determine the under-reporting potential of INOCs when assessing organic water pollution via COD_Cr and reveal the mechanisms underlying such under-reporting. COD_Cr reported only 0%–20% of the theoretical values of short-chain organic amines and pyridine derivatives, thereby posing severe challenges to both the treatment and reclamation of wastewater. Density functional theory calculations revealed that the use of dichromate-based transformation of INOCs to highly stable protonated/ionic forms under acidic conditions may lead to incomplete reactions, resulting in a significant under-reporting potential of INOCs. Our results may serve as a basis for governments, industries, and other stakeholders to respond more effectively to challenges posed by INOCs. © 2023

关键词： Chemical oxygen demand environmental management Inoxidizable nitrogenous organic compounds Organic pollution Water treatment

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Effects of microplastics on N₂O production and reduction potential in crop soils of northern China

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Chemosphere 2024年 351卷

作者： Zhong, Lei Li, Xinhao Sun, Yuru Xiao, Hui Tang, Yafang Wang, Ruying Su, Xiaoxuan School of Environmental Science and Engineering Tianjin University Tianjin 300350 China Beijing Construction Engineering Group Environmental Remediation Co. Ltd National Engineering Laboratory for Site Remediation Technologies Beijing 100015 China Institute of Agricultural Resources and Environment Tianjin Academy of Agricultural Sciences Tianjin 300384 China Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables College of Life Science and Technology Hubei Engineering University Xiaogan China Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin College of Resources and Environment Southwest University Chongqing 400715 China

Microplastics (MPs) pollution are found to be increasing in vegetable soils and potentially affecting N2O production and their associated pathways;however, its specific effects remain unclear. Here, we selected two co... 详细信息

Microplastics (MPs) pollution are found to be increasing in vegetable soils and potentially affecting N₂O production and their associated pathways;however, its specific effects remain unclear. Here, we selected two common MPs, PE and PP at four different concentration levels of 0, 0.5, 1.5 and 3%, and conducted several incubation experiments aiming to explore soil bacterial and fungal N₂O production. Results showed that the bacteria were the main contributors for the production of N₂O, regardless of the absence or presence of MPs;and its contribution was decreased with increasing concentrations of PE and PP. The nosZ clade I and II genes were positively correlated with N₂O reduction rates, indicating a combined regulation on soil N₂O reduction. PE significantly inhibited the bacterial nitrification and denitrification, but did not affect the total N₂O production rates;while PP significantly reduced both the bacterial and fungal N₂O production rates. The resistance of fungal N₂O production to MPs pollution was stronger than that of the bacterial N₂O production. It highlights that the MPs pollution could reduce the potential of N₂O production and reduction, and thus disturb soil nitrogen cycling system;while the inhibition on N₂O production via bacteria and fungi varies with different types of MPs. This study is conducive to an improved and more comprehensive understanding of the ecological impacts of MPs within the agroecosystem. © 2024

关键词： Bacteria Denitrification Fungi Gene abundances Nitrification

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B–Li differential enrichment of geothermal systems in the Da Qaidam and Gonghe–Guide Basin, northeastern Tibetan Plateau: Evidence from water chemistry and H–O–B–Li isotopes

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Science of the Total Environment 2024年 955卷 176868页

作者： Han, Chunmei Fan, Qishun Xiao, Yong Li, Qingkuan Yang, Haotian Chen, Tianyuan Zhao, Weiyong Wang, Shengbin Key Laboratory of Green and High-end Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining810008 China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining810008 China University of Chinese Academy of Sciences Beijing100049 China Faculty of Geosciences and Engineering Southwest Jiaotong University Chengdu611756 China Research Institute of Exploration and Development Qinghai Oilfield Branch CNPC Gansu Dunhuang736202 China Key Laboratory of Geo-environment of Qinghai Province Bureau of Qinghai Environmental Geological Prospecting Xining810001 China

Typical geothermal systems in the Da Qaidam (DQ) and Gonghe–Guide Basin (GGB) on the northeastern Tibetan Plateau (NETP) discharged different B–Li contents. A widely accepted metallogenic model is that the salt–lake type B–Li deposits in the TP are recharged by geothermal fluids with B–Li–rich, carried by rivers and enriched in the terminal salt lakes. The B–Li–rich geothermal water is the key source of mineralization in salt lakes, however, enrichment mechanism governing differential B–Li contents in DQ and GGB geothermal systems remains ambiguous. This study systematically deciphers water chemistry and isotope characteristics (δD, δ18O, δ11B, δ7Li) of river waters, geothermal waters, sinters and surrounding rocks to discuss the enrichment process of B–Li elements in the DQ and GGB geothermal systems. The δD and δ18O values of geothermal systems in the DQ (δD = −79.60 ∼ −82.40 ‰, δ18O = −10.97 ∼ −11.38 ‰) and GGB (δD = −64.00 ∼ −97.10 ‰, δ18O = −8.70 ∼ −13.00 ‰) are close to the GMWL and LMWL, indicating meteoric origin. The δD and high Cl− values (300–900 mg/L) of geothermal waters in the DQ and Qiabuqia, Qunaihai, Zhacangsi along Riyueshan of the GGB imply that these geothermal waters mixed by magmatic fluid and meteoric water. The hot springs in the DQ (B = 38.35–46.29 mg/L, Li = 3.11–3.72 mg/L) and GGB (B = 0.17–8.16 mg/L, Li = 0.08–10.49 mg/L) exhibit differential B–Li geochemical characteristics. B and Li contents are higher in DQ hot springs and in hot springs along Riyueshan of the GGB, respectively. Comparison of the B–Li contents and δ11B–δ7Li values of geothermal waters, sinters and host rocks reveals that B–Li contents of geothermal waters are controlled by B–rich HP-UHP metamorphic rocks formed by metamorphism and Li–rich granites or pegmatites formed by magmatism in the Qilian Shan, respectively. Moreover, metamorphic and magmatic processes, combining with deep circulation reactivated by the thrust or strike–slip faults, create differential enrichment

关键词： Hot springs

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Tolerance to Saline Stresses by Aerobic Granular Sludge: Performance and Mechanisms

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SSRN 2022年

作者： Wu, Xiao Li, Hui Wang, Yuxiang Hu, Jiamei Liu, Xinyu Zhang, Hongsheng Liu, Yongdi Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau The National Ethnic Affairs Commission School of Chemistry and Environment Southwest Minzu University Chengdu610041 China Institute for Environmental Pollution and Health School of Environmental and Chemical Engineering Shanghai University Shanghai200444 China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China

Nowadays, saline wastewater is regarded as a challenge to wastewater treatment plants, in which high salinity shows an unfavorable effect on the conventional biological technology. Aerobic granular sludge (AGS) has attracted interests as a promising technologies for saline wastewater treatment because of its compact structure and the ability to withstand toxic loadings. Therefore, this study investigated salt-tolerance performance and mechanisms of AGS under low-salinity and high-salinity conditions that the saline concentration ranged from 0 to 50 gNaCl/L. The results showed that AGS could withstand long-term saline stresses, and the maximum salinity reached 50 g/L within 113 d. Under 10 g/L, 30 g/L and 50 g/L salinity, COD removal were 90.3%, 88.0% and 78.0% respectively, which suggests effective organic matter removal could reach in aerobic granular system. AGS remained relatively high bioactivity under 10 g/L and 30 g/L salinity. AGS also maintained strength and aggregation under 10 g/L and 30 g/L salinity. The integrity coefficients (IC) maintained 96.2% and 97.7%. The relative hydrophobicity (RH) remained 80.5% and 83.8% at the same time. The salt-tolerance mechanisms should be ascribed to overproduction of extracellular polymeric substances (EPS) by non-halophilic bacteria that enhanced sludge aggregation. And the compact structure that ensure the microorganisms bioactivity within AGS maintained the function of removing organic matters under 10 g/L and 30 g/L salinity. Under 50 g/L salinity, major shift of microbial community happened. Moderately halophilic bacteria, including Salinicola, Thioclava , Idiomarina and Albirhodobacter , prevailed in the reactor. The salt-tolerance mechanisms under 50 g/L saline condition were that the dominated microbial communities shifted to moderately halophilic bacteria, which could maintain aerobic granular stabilization and organic matters removal. These results provide further insight into the application of AGS for saline

关键词： Biogeochemistry

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Toxic Effects of Nanoplastics and Microcystin-Lr Coexposure on the Liver-Gut Axis of Hypophthalmichthys Molitrix

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SSRN 2023年

作者： Zhang, Chaonan Bao, Feifan Wang, Fei Xue, Zhihao Lin, Daohui Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Department of Environmental Science Zhejiang University Hangzhou310058 China Zhejiang Ecological Civilization Academy Huzhou313300 China National-Local Joint Engineering Laboratory of Aquatic Animal Genetic Breeding and Nutrition Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development College of Life Science Huzhou University Huzhou313000 China

Plastic products and nutrients are widely used in aquaculture facilities, resulting in copresence of nanoplastics (NPs) released from plastics and microcystins (MCs) from algae. The potential effects of NPs-MCs coexposure on aquatic products require investigation. This study investigated the toxic effects of polystyrene (PS) NPs and MC-LR on the gut-liver axis of silver carp Hypophthalmichthys molitrix, a representative commercial fish, and explored the effects of the coexposure on intestinal microorganism structure and liver metabolic function using traditional toxicology and multi-omics association analysis. The results showed that the PS-NPs and MC-LR coexposure significantly shortened villi length, and the higher the concentration of PS-NPs, the more obvious the villi shortening. The coexposure of high concentrations of PS-NPs and MC-LR increased the hepatocyte space in fish, and caused obvious loss of gill filaments. The diversity and richness of the fish gut microbes significantly increased after the PS-NPs exposure, and this trend was amplified in the copresence of MC-LR. In the coexposure, MC-LR contributed more to the alteration of fish liver metabolism, which affected the enrichment pathway in glycerophospholipid metabolism and folic acid biosynthesis, and there was a correlation between the differential glycerophospholipid metabolites and affected bacteria. These results suggested that the toxic mechanism of PS-NPs and MC-LR coexposure may be pathological changes of the tissues, intestinal microbiota disturbance, and glycerophospholipid metabolism imbalance. The findings not only improve the understanding of environmental risks of NPs combined with other pollutants, but also provide potential microbiota and glycerophospholipid biomarkers in silver carp. © 2023, The Authors. All rights reserved.

关键词： Metabolism

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Quantification of Biochemical Processes Governing Nitrate Delivery in a Tide Gate-controlled Seagoing River During the Closed Tide Gate Period

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SSRN 2022年

作者： Huang, Yinbin Fan, Zhongya Zhao, Changjin Chen, Gang Huang, Ju Zhou, Zhongbo Xiao, Yeyuan Department of Civil and Environmental Engineering College of Engineering Shantou University Guangdong Shantou515063 China National Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510530 China College of Resources and Environment Southwest University Chongqing400715 China

Substantial biochemical processes occur in tide gate-controlled seagoing rivers during the closed tide period, owing to the low-flow conditions, thus affecting nitrogen (N) delivery to estuaries;however, these processes have been scarcely examined. This study aimed to quantify the biochemical processes affecting nitrate fate and transport in Lianjiang River, Guangdong, China, during the closed tide gate period, via daily grab water sampling at four equidistant sample sites upstream from the tide gate and continuous on-line water monitoring at the gate. The survey from July to December 2020 showed that the mean nitrification rate peaked at 0.45 mg L -1 d -1 in October and was gradually reduced to 0.32 mg L -1 d -1 in December. Conversely, the mean total nitrogen removal rate was at the lowest level of 0.34 mg L -1 d -1 in September, but increased to 0.68 mg L -1 d -1 in December. Likewise, the mean N assimilatory uptake rate was increased from the lowest level of 0.21 mg L -1 d -1 in September to 0.36 mg L -1 d -1 in December, coinciding with the increase in NO 3 - -N concentration from 0.43 mg L -1 to 5.66 mg L -1 at site LB. These results suggest the substrate concentration decided the overall N transformation efficiency in Lianjiang River. Nitrification dominated in the early stage of the closed tide gate period at the upstream section, while denitrification was greatly enhanced along the river and with time, resulting in a significant amount of N removal in winter in the river. Therefore, N removal through nitrification-denitrification was promoted by closing of the tide gate. This study provides new insight into long-term N transport and fate in the upstream section of a closed tide gate to develop optimal tide gate regulation schemes. © 2022, The Authors. All rights reserved.

关键词： Nitrates

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Research on the Potential of Urban Green-Blue Infrastructure in Carbon Reduction Benefits

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景观设计学(中英文) 2025年第2期13卷 12-25页

作者： Yunsheng BAI Gengyuan LIU Mingwan WU Zhaoman HUO Ningyu YAN Fanxin MENG Qing YANG Zhongming LU Silvio CRISTIANO State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China Beijing Engineering Research Center for Watershed Environmental Restoration and Integrated Ecological Regulation Beijing 100875China Guangdong Basic Research Center of Excellence for Ecological Security and Green Development Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of EducationSchool of EcologyEnvironment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China Division of Environment and Sustainability Hong Kong University of Science and TechnologyHong Kong 999077China Department of Architecture University of FlorenceFlorence 50121Italy

Urban green-blue infrastructures(GBls)are increasingly gaining attention in the pursuit of carbon neutrality,particularly within residential *** this background,this study established an integrated quantitative framework to assess both direct and indirect carbon reduction benefits of urban GBls,by leveraging Life Cycle Assessment approach to precisely calibrate the carbon sequestration benefits of three typical urban GBls(green roofs,sunken green spaces,and rain gardens)under three different scenarios and building a carbon sequestration database that includes 36 local plant species in *** research results indicate that GBls have a reducing effect on carbon emissions in urban residential *** extrapolating the simulation results to the city scale,the preliminary estimation suggests that the construction of GBls within residential areas in Shanghai can achieve a carbon sink of approximately 540.54 million tCOzeq per *** level of carbon sequestration is equivalent to 32%of Shanghai's annual carbon *** is evident that the construction of GBls possesses significant potential in carbon reduction benefits and for achieving urban carbon neutrality strategies.

关键词： Green-Blue Infrastructure Life Cycle Assessment Planting Design Green-Blue Infrastructure Design Carbon Reduction Benefit Carbon Sequestration Residential Area

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Three-Dimensional Charge Carrier Transport Channel Enhanced Photocatalytic H2o2 Production in Pure Water Over G-C3n4

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SSRN 2023年

作者： Ma, Jun Gou, Shuyuan Wang, Chuan Gong, Zehan Wang, Qian Li, Xiaoting Chen, Xianjie Wang, Jun Zhu, Yongfa College of Chemistry and Materials Science Sichuan Normal University Chengdu610068 China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing China State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and Technology Mianyang621010 China Department of Chemistry Tsinghua University Beijing100084 China

Photocatalytic H2O2 generation over polymeric carbon nitride (g-C3N4) always suffers from the easy recombination of charge carriers. Herein, g-C3N4 with three-dimensional charge carriers transport channel was constructed to facilitate charge carrier transport and separation through introducing cyano group in the intralayer and doping alkali metals between the interlayer as well. The optimum H2O2 accumulation concentration reached 164.60 µM under visible-light irradiation for 3 h in pure water with a formation rate constant of 160.90 uM h-1, being 17.2 times higher than the pristine g-C3N4. The apparent quantum yield reached 14.52% at 420 nm, exceeding most of the metal-free catalysts reported to date. The significantly improved photocatalytic performance was ascribed to the 3.2-fold higher charge carrier transport and separation efficiency. Therefore, our present work would pave the way for the design of catalysts with fluent transport channels of charge carriers © 2023, The Authors. All rights reserved.

关键词： Rate constants

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Efficient and Simultaneous Immobilization Of Fluoride and Lead in Water And Tea Garden Soil by Bayberry Tannin Foam Loaded Zirconium

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SSRN 2023年

作者： Huang, Xiaolu Zhang, Mei Wang, Minghui Wen, Zhuoyu Jiang, Yamei Sui, Yunhao Li, Xiaoting Ma, Jun Liao, Yang College of Chemistry and Materials Science Sichuan Normal University Chengdu610068 China Key Laboratory of Land Resources Evaluation and Monitoring in Southwest Ministry of Education of China Chengdu610066 China Engineering Research Center for the Development of Farmland Ecosystem Service Functions Sichuan Province 610068 China Chinese Research Academy of Environmental Sciences China

Metals and non-metals in tea leaf mainly derive from the tea garden soil. Immobilization of metals and nonmetals is the key to eliminate this compound pollution, thus preventing their migration from the tea garden soil to the tea tree. In this paper, the natural product bayberry tannin was employed as raw material to fabricate functional materials (TF-Zr) for simultaneous adsorption of fluorine (F) and lead (Pb) by the reactivity of tannin with Pb2+ and the affinity of Zr with F. The characterization techniques such as SEM-Mapping, EDS, FT-IR, XPS were utilized to probe the adsorption mechanism. The results showed that TF-Zr could simultaneously and efficiently adsorb F- and Pb2+ with the adsorption capacity of 5.02 mg/g (Pb) and 4.55 mg/g (F), and the adsorption processes were both in accordance with the proposed secondary kinetic adsorption model. Besides, the presence of F- promoted the adsorption of Pb2+ by TF-Zr. The materials were applied into the tea garden soil to explore its effect on the variation of F and Pb forms in tea garden soil. It found the proportion of water-soluble fluorine, exchangeable fluorine and exchangeable lead in the tea garden soil decreased significantly, while the proportion of residual fluorine and residual lead increased evidently, illustrating TF-Zr possessed eximious fixation effect on the highly reactive fluorine and lead in the soil and facilitated their conversion to the more stable residue state. Therefore, TF-Zr can be used for the efficient and simultaneous immobilization of fluorine and lead in water and tea garden soil. © 2023, The Authors. All rights reserved.

关键词： Flavonoids

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Optimized Preparation of N-Modified Ceo2 Material and Stably Efficient Degradation of 2,4-Dcp

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SSRN 2023年

作者： Wang, Minghui Zhang, Mei Wen, Zhuoyu Li, Chaoqun Zhao, Shilin Ma, Jun Li, Xiaoting Liao, Yang College of Chemistry and Materials Science Sichuan Normal University Chengdu610068 China Key Laboratory of Land Resources Evaluation and Monitoring in Southwest Ministry of Education of China Chengdu610066 China Engineering Research Center for the Development of Farmland Ecosystem Service Functions Sichuan Province 610068 China Chinese Research Academy of Environmental Sciences China

Chlorophenols have been frequently detected in the environment, posing potential threats to both the natural ecosystem and human health. Photocatalytic degradation of chlorophenols has become a prominent research focus. However, the development of high-performance and stable photocatalysts remains challenging. In this paper, different ratios of nitrogen-doped cerium dioxide catalysts (N-CeO2) were optimally prepared by microwave-assisted method, and the degradation performance of the materials on 2,4DCP under different conditions was investigated. The findings demonstrate that the 10% N-CeO2 photocatalyst degraded 2,4-DCP with the highest removal rate of 93.51%. Xray Photoelectron Spectroscopy (XPS) and Energy-Dispersive X-ray Spectroscopy (EDS) analyses confirmed the successful nitrogen doping and the presence of oxygen vacancies (Ov), both contributing to the enhancement of photocatalytic activity. Photoluminescence (PL) and photocurrent response measurements indicated that the introduction of nitrogen improved the efficiency of charge carrier separation. Additionally, an analysis of the band gap structure revealed that the band gap of NCeO2 decreased from 3.16 eV (for pure CeO2) to 2.18 eV, resulting in enhanced light absorption capacity. The radical trapping experiments identified the active species involved in the degradation process mainly as •OH, •O2, h+ and e-. The possible reaction mechanism and photocatalytic mechanism of 2,4-DCP degradation were also proposed, and the pollutants were found to be completely mineralized to CO2 and H2O. This work provides a feasible way to prepare nitrogen-doped cerium dioxide high-efficiency photocatalysts with great potential for the removal of chlorophenols. © 2023, The Authors. All rights reserved.

关键词： Cerium oxide

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