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SSRN 2024年

作者： Sun, Hongwei Chang, Huanhuan Zhu, Yuliang Li, Xiaoli Yang, Xiaoyong Zhou, Xin Wu, Daishun Ding, Jing Liu, Yucan School of Environmental and Material Engineering Yantai University Shandong Yantai264005 China School of Environmental and Municipal Engineering Lanzhou Jiaotong University Lanzhou730070 China School of Civil Engineering Yantai University Shandong Yantai264005 China College of Environmental Science and Engineering Taiyuan University of Technology Taiyuan030024 China Fujian Provincial Key Laboratory of Coastal Basin Environment School of Marine and Biochemical Engineering Fujian Polytechnic Normal University Fujiang Fuqing350300 China

This study comprehensively deciphered the effect of silver nanoparticles (AgNPs) on anammox flocculent sludge, including nitrogen removal performance, microbial community structure, functional enzyme abundance, antibiotic resistance gene (ARGs) dissemination, and horizontal gene transfer (HGT) mechanisms. Acute experiments demonstrated that the half inhibitory concentration (IC50) of AgNPs on anammox was 1.41 mg/L, and 3.5 mg/L AgNPs almost completely inhibited anammox. Additionally, after long-term exposure to 0-2.5 mg/L AgNPs for 200 cycles, anammox performance significantly decreased (P © 2024, The Authors. All rights reserved.

关键词： Silver nanoparticles

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Use of carbon-14 labeled trichloroethene to assess degradation potential in rock core microcosms

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science of the Total Environment 2024年 957卷 177540页

作者： Wang, Hao Yu, Rong Iery, Ramona Darlington Freedman, David L. Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing China SynTerra Corp. GreenvilleSC United States Naval Facilities Engineering and Expeditionary Warfare Center Port HuenemeCA United States Department of Environmental Engineering and Earth Sciences Clemson University ClemsonSC29634 United States

In fractured rock aquifers contaminated with trichloroethene (TCE), the extent of groundwater plumes is impacted by degradation occurring within the rock matrix. The objective of this study was to evaluate TCE degradation in rock samples from three sites where in situ conditions may favor natural or enhanced attenuation. Intact rock core microcosms (94 total) were used to assess in situ conditions and enhancement by addition of lactate or lactate + sulfate. A key advance for this study was inclusion of carbon-14 (14C) labeled TCE in the experimental design, which enables monitoring of 14C-labeled products in addition to more readily detectable compounds associated with TCE degradation (i.e., cis-1,2-dichloroethene (cDCE), vinyl chloride, acetylene, ethene, and ethane). 14C-labeled products comprised 35–95 % of the total degradation products recovered over 9–21 months of monitoring, indicating that inclusion of 14C-TCE was essential to capturing the full potential for abiotic and biotic degradation of TCE. Microcosms infused with TCE but not 14C-TCE exhibited enrichment in δ13C-TCE, and enrichment in δ13C-cDCE in microcosms that underwent reductive dechlorination of TCE to cDCE. The results demonstrate the advantages of using diffusion-transport microcosms and 14C-TCE to document degradation of chlorinated ethenes in fractured rock aquifers. © 2024 Elsevier B.V.

关键词： Dechlorination

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Preparation of Functionalized Attapulgite Composite with Adsorption-Degradation Capability and its Removal Behavior of Congo Red from Dye Wastewater

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SSRN 2022年

作者： Ma, Aishun Liao, Xiaofeng Qian, Hanlin Liu, Juan Liu, Hongxia Ren, Sili Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control Jiangxi University of Science and Technology Ganzhou China Jiangxi Key Laboratory of Mining Engineering Jiangxi University of Science and Technology Ganzhou China

Dye wastewater poses a serious threat to water resources and the removal of dye molecules from dye wastewater has attracted much attention. In this work, attapulgite (ATP) mineral nanomaterials were firstly grafted with magnetic Fe 3 O 4 nanoparticles and then modified with polyethyleneimine (PEI) to prepare functionalized magnetic attapulgite composites (ATP-Fe 3 O 4 -PEI), which was used for the treatment of Congo red (CR) dye wastewater. The structure and surface properties of the composites were analyzed and characterized through FT-IR, XRD, SEM, TEM, BET analysis, zeta potential measurement, and VSM analysis. The removal performance and removal mechanism of ATP-Fe 3 O 4 -PEI for CR was studied and revealed. It was believed that the CR removal by ATP-Fe 3 O 4 -PEI was a coexistence of adsorption and degradation. On the one hand, the CR molecules were multi-layer adsorbed on the surface of the composite driven by electrostatic attraction, hydrogen bonds, and π-π interaction. On the other hand, the removal of CR by ATP-Fe 3 O 4 -PEI was further enhanced by a degradation process. Without external addition of oxidizer (such as H 2 O 2 and other peroxide) and illumination excitation, the system itself could produce H 2 O 2 and hydroxyl radicals (·OH) to degrade the CR molecules. Under the two removal behaviors, the removal rate of ATP-Fe 3 O 4 -PEI for CR was more than 95 % corresponding to a removal capacity of 942.11 mg·g -1 at pH=3 and 25 °C. These findings indicate that the prepared magnetic attapulgite composite possesses an excellent adsorption-degradation performance for CR and has potential application in dye wastewater treatment. © 2022, The Authors. All rights reserved.

关键词： Adsorption

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Analysis of precipitable water vapor change based on GNSS observations during typhoon Mangkhut event

Analysis of precipitable water vapor change based on GNSS ob...

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第十三届中国卫星导航年会

作者： Zhedong Liu Tengxu Zhang Junyu Li Jiao Xu Liangke Huang Lv Zhou Lilong Liu College of Geomatics and Geoinformation Guilin University of Technology Guangxi Key Laboratory of Spatial Information and Geomatics College of Resources and Environmental Science and Engineering Hubei University of Science and Technology

Typhoon is a kind of natural disaster that often happens in coastal cities in summer, which endangers people's life and property safety. Typhoons often carry a large amount of precipitable water vapor, precipitable water vapor distribution and dynamic change during the typhoon transit process is of great significance for the monitoring and forecast of typhoon. Compared with the traditional use of sounding balloon observation water vapor, PWV(Precipitable Water Vapor) retrieval using ground-based Global Navigation Satellite System(GNSS) has the advantages of high temporal and spatial resolution and near real time. Therefore, this paper inversed the PWV based on GNSS observation data in Guangxi, verified the reliability of GNSS inversion PWV by using the PWV observed by high-precision sounding station, and finally analyzed the dynamic changes of water vapor in Guangxi during the passing of Typhoon Mangkhut in combination with ERA5 reanalysis data. The results showed that:(1) GNSS-PWV has good consistency with the measured data of sounding station, which can be used to monitor the change of precipitable water vapor in extreme weather.(2) GNSS-PWV and ERA5 PWV can directly and clearly reflect the dynamic transport process of precipitable water vapor in time and space during typhoons, providing reference for predicting the movement, intensity and precipitation of typhoons.

关键词： Typhoon GNSS PWV ERA5

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Machine learning for pore-water pressure time-series prediction:Application of recurrent neural networks

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Geoscience Frontiers 2021年第1期12卷 453-467页

作者： Xin Wei Lulu Zhang Hao-Qing Yang Limin Zhang Yang-Ping Yao State Key Laboratory of Ocean Engineering Department of Civil EngineeringShanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Shanghai 200240China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina Department of Civil Engineering School of Transportation Science and EngineeringBeihang University37 Xueyuan RoadHaidian DistrictBeijing 100191China

Knowledge of pore-water pressure(PWP)variation is fundamental for slope stability.A precise prediction of PWP is difficult due to complex physical mechanisms and in situ natural *** explore the applicability and advantages of recurrent neural networks(RNNs)on PWP prediction,three variants of RNNs,i.e.,standard RNN,long short-term memory(LSTM)and gated recurrent unit(GRU)are adopted and compared with a traditional static artificial neural network(ANN),i.e.,multi-layer perceptron(MLP).Measurements of rainfall and PWP of representative piezometers from a fully instrumented natural slope in Hong Kong are used to establish the prediction *** coefficient of determination(R^2)and root mean square error(RMSE)are used for model *** influence of input time series length on the model performance is *** results reveal that MLP can provide acceptable performance but is not *** uncertainty bounds of RMSE of the MLP model range from 0.24 kPa to 1.12 k Pa for the selected two *** standard RNN can perform better but the robustness is slightly affected when there are significant time lags between PWP changes and *** GRU and LSTM models can provide more precise and robust predictions than the standard *** effects of the hidden layer structure and the dropout technique are *** single-layer GRU is accurate enough for PWP prediction,whereas a double-layer GRU brings extra time cost with little accuracy *** dropout technique is essential to overfitting prevention and improvement of accuracy.

关键词： Pore-water pressure Slope Multi-layer perceptron Recurrent neural networks Long short-term memory Gated recurrent unit

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NiO lattice oxygen overflow promoted by Ti3C2 support enhances catalytic hydrolysis of carbonyl sulfide in metallurgical gas

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Nano Materials science 2024年

作者： Zhao, Shunzheng Tan, Yiran Tang, Xiaolong Gao, Fengyu Yu, Qingjun Kang, Dongjuan Liu, Yunpeng Yi, Honghong Country Department of Environmental Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing100083 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

Achieving efficient hydrolysis of carbonyl sulfide (COS) on catalysts at moderate temperature, while suppressing the production of sulfate and carbon, remains a daunting challenge. Herein, NiO/Ti3C2 MXene composites were prepared for the catalytic hydrolysis of COS at moderate temperature based on DFT simulation calculations that indicate the catalytic system of lattice oxygen activation-migration is conducive to COS hydrolysis. The NiO/Ti3C2 exhibited a prominent COS hydrolysis activity compared to the pure NiO. Based on various characterizations and DFT calculations, a proton capture strategy for enhanced COS hydrolysis activity was proposed. The existence of a strong electronic interaction between NiO and Ti3C2 activates the adjacent Ni-O bond at the interface, and makes the surface top-Ni active sites fully exposed under CO atmosphere. These top-Ni species accelerate the dissociation of H2O into ∗H, and facilitates protons transport to the intermediate ∗SH, thereby promoting the formation of H2S and the entire hydrolysis process. This proton capture strategy may provide help for the preparation of various high-performance catalysts for diverse hydrogenation reactions even beyond COS hydrolysis. © 2024 Chongqing University

关键词： Sulfur compounds

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Competitive Mn(Ii) Removal Occur in One Bacterium Through Microbially-Induced Carbonate Precipitation (Micp) and Indirect Mn(Ii) Oxidation

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SSRN 2022年

作者： Ma, Huiqing Wen, Zhaoqi Yi, Xianliang Liu, Yang Yang, Hanyi Zhou, Hao Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education School of Ocean Science and Technology Dalian University of Technology Panjin Campus China

The major source of the natural manganese oxides (MnOx) is microbial-mediated Mn(II) oxidation. Compared with the direct Mn(II) oxidation catalyzed by various proteins, the indirect Mn(II) oxidation through the other metabolic activities of microbes were less investigated. In this study, we reported a competitive Mn(II) removal process during the indirect Mn(II) oxidation of Lysinibacillus sp. MHQ-1, i.e., microbially-induced carbonate precipitation (MICP). In the presence of 1 mM Mn(II), 39.4% of free Mn(II) converted to MnCO3(s) quickly within 100 h, and then 11.6% of initial Mn(II) slowly oxidized to MnOx within 442 h. The urease activity assay and the genome sequencing confirmed the existence of urease and the absence of Mn(II)-oxidizing enzymes. The urease catalyzed the formation of carbonate ion to react with Mn(II), and then the metabolic produced ammonia promote the pH to induce the indirect Mn(II) oxidation. Genome survey suggests the urease widely exists in various Mn(II)-oxidizing bacteria (MnOB), emphasizing the importance to reconsider the biological Mn(II) removal in nutrient-rich environment. © 2022, The Authors. All rights reserved.

关键词： Manganese oxide

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Endocrine disrupting effects of parabens in zebrafish (Danio rerio): New insights from transcriptomics, metabolomics, and molecular dynamics simulation

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Chemosphere 2024年 354卷 141682页

作者： Wei, Fang Yue, Huifeng Wang, Binjie Cheng, Hefa Sang, Nan Department of Environmental Engineering China Jiliang University Zhejiang Hangzhou310018 China College of Environment and Resource Research Center of Environment and Health Shanxi University Shanxi Taiyuan030006 China Key Laboratory of Drug Prevention and Control Technology of Zhejiang Province Department of Criminal Science and Technology Zhejiang Police College Zhejiang Hangzhou China MOE Laboratory for Earth Surface Process College of Urban and Environmental Sciences Peking University Beijing100871 China

Parabens (PBs), a group of widely used synthetic preservatives with potential endocrine disrupting activity, have been detected with increasing frequency in organisms and environmental matrices. This study assessed the hormone interference effects of four typical PBs, namely methylparaben (MeP), ethylparaben (EtP), propylparaben (PrP), and butylparaben (BuP), in zebrafish and elucidated the probable underlying mechanisms. Transcriptomic and metabolomic analyses showed that the differentially expressed genes and metabolites were associated with the tyrosine metabolism, arachidonate metabolism, and glycerophospholipid metabolism, indicating they were essential precursors of steroid hormone biosynthesis and metabolism. Histopathological analysis revealed impaired gonad development in the zebrafish exposed to PBs, as evidenced by the significantly increased vitellogenin (VTG) and estradiol (E2) levels. Furthermore, molecular dynamics simulation suggested that the four PBs could preferentially activate the zebrafish estrogen receptor, zfERβ2, to regulate the downstream pathways. Disruption of the amino acid metabolism and lipid metabolism, and activation of zfERβ2 signaling pathway were found to be the key mechanisms for the endocrine disrupting effects of PBs. The hormone interference effects of PBs were apparently dependent on the shared oxybenzene on their structures, with the degree of interference determined largely by the length of their alkyl chains. These findings provide new insights into the endocrine disrupting effects of PBs and could help better assess their risk to human health. © 2024 Elsevier Ltd

关键词： Molecular dynamics

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Study on Expansion Performance and Mechanical Strength Characteristics of Expansive Backfill

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SSRN 2024年

作者： Yao, Nan Ruan, Xi Zhang, Guangquan Yu, Zhenjian Meng, Junbo Huang, Tianyu School of Resources and Environmental Engineering Wuhan University of Science and Technology Hubei Wuhan430081 China Hubei key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resource Wuhan University of Science and Technology Hubei Wuhan430081 China Anhui Development Mining Co Anhui Luan237462 China

To effectively improve the roof-contacted filling rate, a new expansive backfill was developed, which can rapidly produce volume expansion and then fill the roof-contacted area. The effects of foaming agent content and expansion agent content on the expansion and strength properties of expansive backfill were investigated though expansion development process monitoring test, uniaxial compression test, XRD and SEM tests, the tests results showed that：(1) Volume expansion rate of expansive backfill increased with the increase of foaming agent content and decreased with the increase of expansion agent content. (2) The expansion development cycle of the expansive backfill was 3 days, mainly concentrated in the first two hours, which can be divided into three stages: extremely rapid expansion, slow expansion and residual expansion stage. (3) The internal pores of expansive backfill greatly affected the uniaxial compressive strength of the. The increase of expansion agent content made the foaming amount decrease, leading to smaller internal pores, which made the compressive strength increase. (4) With the increase of expansion agent content, the internal pores became smaller and less distributed, which made the pore water in full contact with the cementitious material and promoted the hydration reaction. More hydration products were generated and filled the pores, which improved the compactness of the hydration products, optimized the load-bearing frame of the backfill, and further improved the strength of the expansive backfill. © 2024, The Authors. All rights reserved.

关键词： Expansion

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Fe⁰-dependent carbon dioxide reduction to methane via diverse electron transfer pathway in methanogenic community

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Cell Reports Sustainability 2024年第2期1卷

作者： Gao, Tianyu Xia, Lichao Zhang, Hanmin Tawfik, Ahmed Meng, Fangang School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510275 China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University) Guangzhou 510275 China Key Laboratory of Industrial Ecology and Environmental Engineering (MOE) School of Environmental Science and Technology Dalian University of Technology No. 2 Linggong Road Dalian 116024 China National Research Centre Water Pollution Research Department Dokki Giza 12622 Egypt Department of Environmental Sciences College of Life Sciences Kuwait University P.O. Box 5969 Safat 13060 Kuwait

In natural and engineered environments, iron biocorrosion is an energy reservoir for growth of methanogens. However, how archaea accept electrons from metallic iron remains enigmatic. Here, we report that a Methanothrix-dominated methanogenic community from anaerobic granular sludge can reduce carbon dioxide (CO₂) to methane (CH₄) via electron uptake from zero-valent iron (ZVI). Through the batch experiments, a maximum CH₄ yield of 40.8 ± 0.6 μeequiv/day and an electron recovery from ZVI oxidation to CH₄ generation of 69.7% ± 6.1% are observed. Metagenome analysis and inhibition experiments indicate that electrons released by corrosive bacteria are utilized by Methanothrix for accomplishing CO₂-to-CH₄ conversion via potential intracellular and extracellular electron transfer. The results of activity tests of four electron donors (i.e., ZVI, stainless steel, H₂, and acetate) suggest that the ZVI-dependent methanogenesis dominate the overall CH₄ generation compared with hydrogenotrophic and acetoclastic methanogenesis, which provides a new insight into autotrophic metabolism of methanogens. © 2024 The Authors

关键词： biocorrosion extracellular electron transfer syntrophic methanogenesis zero-valent iron

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