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Coextraction of vanadium and manganese from highmanganese containing vanadium wastewater by a solvent extraction-precipitation process

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 902-912页

作者： Zishuai Liu Yimin Zhang Zilin Dai Jing Huang Cong Liu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China Guangdong Research Institute of Rare-Metal Guangzhou 510650China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China Hubei Provincial Engincering Technology Research Center of High Eficient Cleaning Uilization for Shale Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China

High-manganese containing vanadium waste-water(HMVW)is commonly produced during the vanadium extraction process from vanadium *** cannot be reused and discharged directly,and is harmful to the environment and affect product quality due to heavy metals in the *** wastewater is usually treated by lime neutralization,but valuable metals(especially V and Mn)cannot be *** this study,an efficient and environmentally friendly method was developed to recover valuable metals by using a solvent extraction-precipitation *** the solvent extraction process,98.15%of vanadium was recovered,and the V2Os product,with a purity of 98.60%,was obtained under optimal *** the precipitation process,91.05%of manganese was recovered as MnCO3 which meets the III grade standard of HG/T *** simulation analysis indicated that MnCO3 was selectively precipitated at pH 6.5 while Mg and Ca could hardly be *** results of X-ray diffraction and scanning electron microscopy demonstrated that the obtained V2Os and MnCO3 displayed a good degree of *** treated wastewater can be returned for leaching,and resources(V and Mn)in the wastewater were utilized efficiently in an environmentally friendly ***,this study provides a novel method for the coextraction of V and Mn from HMVW.

关键词： high-manganese containing vanadium waste-water solvent extraction carbonate precipitation vanadium titano-magnetite valuable metal recovery

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Complexation between Butyl Xanthate and Cu Enhanced Peroxydisulfate Activation and Cation Redox Cycle by Fe-Cu-Ldh/Biochar

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SSRN 2023年

作者： Li, Baoxin Hu, Xinjiang Gu, Yanling Yang, Hailan Ye, Shujing Yang, Zhongzhu Liu, Ni Tan, Xiaofei College of Environmental Science and Engineering Key Laboratory of Environmental Biology and Pollution Control Ministry of Education Hunan University Changsha410082 China Shenzhen Research Institute of Hunan University Shenzhen518055 China College of Environmental Science and Engineering Central South University of Forestry and Technology Changsha410004 China College of Materials Science and Engineering Changsha University of Science and Technology Changsha410114 China School of Resources Environment and Materials Guangxi University Nanning530004 China School of Public Administration and Human Geography Hunan University of Technology and Business Changsha410205 China

Butyl xanthate (BX) is one of the most widely used collector in sulfide flotation. It is harmful to human health but its degradability has not been addressed in depth. In this study, Fe-Cu-Layered double hydroxides/Biochar composites (Fe-Cu-LDH/BC) were prepared and firstly used to activate peroxydisulfate (PDS) for degradation of butyl xanthate. More than 90% degradation of BX could be achieved within 10 min. The high degradation efficiency was owing to the complex formation between catalyst and contaminant molecule by a coordination bond of the Cu in Fe-Cu-LDH/BC and the S in BX. Through DFT calculations, it could be found that this complexation enhanced the adsorption efficiency of LDH/BC on PDS. And the reactivity of the Cu site. EPR was applied to analyze the reactive substances in the reaction, and various reactive oxygen species such as O2•−, •OH and SO4•− were detected in the process. In addition, LC-MS was used to analyze and speculate the intermediates and degradation pathways of BX. In conclusion, this material can rapidly degrade BX in water under different conditions and has great potential in treating mine wastewater. Meanwhile, this study provides a new support for the preparation of new catalysts for the efficient treatment of pollutants. © 2023, The Authors. All rights reserved.

关键词： Degradation

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Citrobacter Sp. Y3 Harboring a Novel Gene Hbcd-Hd-1 Mineralizes Hexabromocyclododecane (Hbcd) with New Metabolic Pathways Based on Multi-Omics Characterization

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SSRN 2022年

作者： Peng, Xingxing Li, Tianyu Zheng, Qihang Lu, Yingyuan He, Yuzhe Tang, Yetao Qiu, Rongliang School of Environmental Science and Engineering Sun Yat-sen University Guangdong Guangzhou510006 China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou510275 China Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety College of Natural Resources and Environment South China Agricultural University Guangzhou510642 China Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural University Guangzhou510642 China South China Agricultural University China

Hexabromocyclododecane (HBCD) is a typical persistent organic pollutant (POP) that is widely detected in the environment. Even big efforts have been put into, but there are still lack of microorganism resource that can completely mineralize HBCD. By stable isotope analysis, we found that the Citrobacter sp. Y3 can use 13C-HBCD as its sole carbon source and degrade or even mineralize it to 13CO2 with a maximum conversion rate of 100% in approximately 14 days. So far as we known, strain Y3 was the only strain which could mineralize HBCD as the sole carbon source. Strain Y3 contains all the enzymes responsible for the debromination of HBCD and the following mineralization, which were upregulated during HBCD treatment. A functional gene named HBCD-hd-1 encoding a haloacid dehalogenase was cloned and heterologously expressed in Escherichia coli. The recombinant E. coli with the HBCD-hd-1 gene could transform the typical intermediate 4-bromobutyric acid (4-BBA) to 4-hydroxybutanoic acid (4-HDBA) and showed excellent degradation performance on HBCD accompanied by nearly 100% bromine ions generation. The expression of HBCD-hd-1 rapidly accelerated the process of HBCD biodegradation. With HBCD as sole carbon source, strain Y3 can potentially degrade brominated flame retardants such as HBCD especially in a low-nutrient environment. © 2022, The Authors. All rights reserved.

关键词： Escherichia coli

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An Intelligent Approach: Integrating Openai for Experiment Planning in Biochar Immobilization of Soil Cd

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SSRN 2023年

作者： Yang, Hongwei Wang, Jie Mo, Rumeng Hu, Pengxiang Liu, Xiangrong Liu, Yingliang Cui, Jianghu Xiao, Yong Key Laboratory for Biomass Materials and Energy Ministry of Education Guangdong Provincial Engineering Technology Research Center for Optical Agriculture College of Materials and Energy South China Agricultural University Guangzhou510642 China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Guangdong Institute of Eco-environmental Science and Technology Guangzhou510650 China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangzhou510650 China Shaoyang Branch of Hunan Tobacco Corporation Shaoyang422000 China Intelligent Connected Vehicle Traffic Accident Investigation and Reconstruction Standard Laboratory Beijing Public Security Bureau Police College Road Traffic Management Department Beijing Police College Beijing102202 China

Immobilization of Cd in soil is a complex systematic process in which biochar materials and experimental conditions need to be selected from an infinite space of candidates. Exploration of the entire space is not feasible due to the large number of repeated experiments required. In this study, we propose a strategy for deeply integrating AI techniques to determine the biochar properties and experimental conditions for achieving maximum immobilisation rates under specific soil conditions. We developed six interpretable tree models, among which the LSBoost model performed best. In addition, we developed a Graphical User Interface (GUI) through which soil properties can be manually entered and Bayesian algorithms applied. This allowed us to inversely extrapolate the experimental conditions that achieved maximum carbon sequestration rates under these soil conditions. Then, we use these conditions to link with OpenAI and utilize ChatGPT to obtain detailed experiment plans, which are displayed on the GUI interface for researchers' reference. © 2023, The Authors. All rights reserved.

关键词： Soils

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keystone species in microbial communities: From discovery to soil heavy metal-remediation

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Journal of hazardous materials 2025年 494卷 138753页

作者： Gengbo Jiang Zhepu Ruan Yalin Yin Chang Hu Li Tian Jia-Nan Lu Shizhong Wang Ye-Tao Tang Rongliang Qiu Yuanqing Chao School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510006 China. Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety College of Natural Resources and Environment South China Agricultural University Guangzhou 510642 China. Electronic address: ruanzhepu@***. School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety College of Natural Resources and Environment South China Agricultural University Guangzhou 510642 China. School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510006 China. Electronic address: chaoyuanq@***.

keystone species have significant impacts on community structure and function regardless of their abundance in space and time, whether individually or collectively. They play a unique and crucial role, and their removal can lead to substantial changes in the microbiome. It is one of the necessary processes to explore key microbial functions and interactions by studying keystone species. The term "keystone species" has been proposed and developed for nearly 60 years, but in microbiology, it is often used interchangeably with similar terms, which hinders the integration and advancement of research. Here, we review similar terms for keystone species in the microbial field and suggest using "keystone species" instead of "keystone taxa". We also summarize and analyze identification approaches for keystone species, highlighting the advantages and disadvantages of each while providing recommendations for selecting appropriate approaches in the environmental field. Based on the serious soil environment problem, this review also takes the research in the field of heavy metal-contaminated soils as case studies, and summarizes and analyzes the research situation of keystone species. Finally, we discuss the current limitations in research on keystone species, offering insights into their future development and application in the microbial field, particularly in remediation for heavy metal-contaminated soils. This review aims to summarize existing research on microbial keystone species and connect the findings to the field of environmental remediation, providing a reference for developing more effective remediation strategies and enhancing our understanding of ecosystem health.

关键词： Heavy metal-contaminated soils Identification keystone species Microorganisms Phytoremediation

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The numerical simulation of a new double swirl static mixer for gas reactants mixing

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2438-2446页

作者： Zhuokai Zhuang Jingtian Yan Chenglang Sun Haiqiang Wang Yuejun Wang Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental&Resources ScienceZhejiang UniversityHangzhou310058China Zhejiang Provincial Engineering Research Centre of Industrial Boiler&Furnace Flue Gas Pollution Control Hangzhou 310058China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Tianlan Environmental Protection Technology Co.Ltd Hangzhou 311202China

For the nitrogen oxide removal processes,high performance gas mixer is deeply needed for the injection of NH3 or *** this study,a new type of double swirl static mixer in gas mixing was investigated using computational fluid dynamics(CFD).The results obtained using Particle Image Velocimetry(PIV)correlated well with the results obtained from *** comparisons in pressure loss between the experimental results and the simulation results showed that the model was suitable and accurate for the simulation of the static *** process conditions and design were *** L/D equaled 4,coefficient of variation(COV)was<5%.The inlet velocity did not affect the distributions of turbulent kinetic *** terms of both COV and pressure loss,the inner connector is important in the design of the static *** nozzle length should be set at 4 *** both COV and pressure loss into consideration,the optimal oblique degree is *** averaged kinetic energy changed according to process conditions and *** new static mixer resulted in improved mixing performance in a more compact *** new static mixer is more energy efficient compared with other SV static ***,the double swirl static mixer is promising in gas mixing.

关键词： CFD PIV Gas mixing Double swirl static mixer Pressure loss

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Machine Learning-Assisted Three-Dimensional Sensing Array for Simultaneous Discrimination and Quantification of Hypochlorite and Hydroxyl Radicals

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SSRN 2022年

作者： Li, Xin Yu, Long Su, Pengchen Lu, Yunfei Zhang, Qiang Wang, Lingxiao Sun, Mingtai Yuan, Chao Qiu, Bing Wang, Suhua Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control School of Environmental Science and Engineering Guangdong University of Petrochemical Technology Guangdong Maoming525000 China MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China School of Materials Science and Technology China University of Geosciences Beijing100083 China

Herein, we reported a new molecular fluorescent probe and employed machine learning methods to develop a three-dimensional sensor array for the simultaneous and rapid identification of hypochlorite and hydroxyl radical with one fluorescent probe, on the basis of its responsive differentiation of spectroscopic properties including fluorescence and UV-vis absorption. The raw array signals were first transformed into a synthetic index by principal component analysis (PCA) for the selective quantitative analysis of hypochlorite and the identification of hydroxyl radicals. Then, hierarchical clustering analysis (HCA) and density clustering analysis (DCA) were used to establish a classifier to correlate the data structure and similarity between various samples. This method quickly grouped different concentrations of hypochlorite, and accurately identified hypochlorite and hydroxyl radical. Finally, by comparing the three-dimensional fluorescence differential spectroscopic data of five kinds of reactive oxygen species, the specific changes of hypochlorite and hydroxyl radical were apparently observed and distinguished from other reactive oxygen species. The method opens up a new way for the accurate identification of environmental pollutants with highly similar properties. © 2022, The Authors. All rights reserved.

关键词： Principal component analysis

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Synchronous Response in Arsenic Methylation and Methanogenesis in Flooded Soil with Rice Straw Amendment

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SSRN 2022年

作者： Zhai, Weiwei Ma, Yanyue Yang, Su Gustave, Williamson Zhao, Tiantian Hashmi, Muhammad Zaffar Pan, Xiangliang Tang, Xianjin Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province College of Environment Zhejiang University of Technology Hangzhou310058 China Institute of Soil and Water Resources and Environmental Science College of Environmental and Resource Sciences Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Zhejiang University Hangzhou310058 China School of Chemistry Environmental & Life Sciences University of the Bahamas New Providence Nassau Bahamas Department of Chemistry COMSATS University Islamabad Pakistan

Rice straw (RS) amendment promote microbial arsenic (As) methylation and methane (CH4) emissions from rice paddy soil. Although methanogens have been correlated with high methylated As concentrations in flooded soils, the role of methanogens in RS induced As methylation remains unknown. Thus, in this study, a classic methanogensis inhibitor (2-bromoethanesulfonate, BES) was used to investigate how methanogenesis would affect As methylation in paddy soils amended with RS. Our results showed that the addition of BES inhibited methanogenesis and led to monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) accumulation. This increase in methylated As species was ascribed to a decrease in As demethylation under the inhibitory conditions in the BES and the RS+BES treatments. Moreover, there was a significant correlation between the transcript abundance of the methyl-coenzyme reductase M (mcrA) gene and the arsenite S-adenosylmethionine methyltransferases (arsM) genes in all treatments. The co-occurrence network analysis indicated a strong correlation between methanogens and arsM-harbouring microbes which further support their role in As methylation. Our results demonstrates that methanogenesis inhibition leads to an accumulation of methylated As by suppressing As demethylation. This work extends recent insights into the links between methanogenesis and As metabolism in flooded soil amended with RS amendment. © 2022, The Authors. All rights reserved.

关键词： Methylation

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Overcoming Coexisted Antibiotics Antagonism-Induced Low Removal Efficiency by Multi-Targeted Catalyst

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SSRN 2022年

作者： Fan, Yu-Han Li, Yu-Qi Hayat, Faisal Liu, Chen Li, Jun Chen, Ming Key Laboratory of Reservoir Aquatic Environment Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China Chongqing School University of Chinese Academy of Sciences Chongqing400714 China College of Resources and Environment Yangtze University Wuhan430100 China College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha410082 China

Various antibiotics often coexist in contaminated water which can pose a threat to the ecological environment and human health. Conventional water treatment technologies generally have low efficiency to simultaneously remove multiple antibiotics, due to the antagonistic effect among them. To address this issue, a bimetal composite corncob biochar catalyst (Fe-MOF-CC@MoS2) was explored for the peroxymonosulfate (PMS) activation to degrade various antibiotics simultaneously in this study. The Fe-MOF-CC@MoS2 was prepared by a simple green hydrothermal carbonization method and characterized. The degradation performance of Fe-MOF-CC@MoS2 for coexisted antibiotics from the aqueous phase was evaluated. The results indicated that the Fe-MOF-CC@MoS2/PMS system exhibited a superior degradation efficiency of antibiotics compared to Fe-MOF-CC/PMS system, due to the acceleration of the Fe 2+/Fe3+ transformation by active Mo4+. Fe-MOF-CC@MoS2/PMS system could simultaneously remove four different types of antibiotics and the removal efficiencies of tetracycline hydrochloride, ciprofloxacin, nitrofurantoin and sulfamethoxazole were 96.51%, 92.30%, 88.96%, and 80.76%, respectively. Electron spin resonance and quenching experiments demonstrated that the cooperation of radical (SO4•-, •OH and •O2-) and non-radical (1O2) in Fe-MOF-CC@MoS2/PMS system leaded to a higher removal efficiency. In addition, Fe-MOF-CC@MoS2 could be applied in water with a broad scope of pH (3.0 ~ 9.0) and inorganic anions, as evidenced by the little effect of Cl- and NO3- on the degradation efficiencies. Moreover, the Fe-MOF-CC@MoS2 presented good reusability through five cycles test. Accordingly, producing Fe-MOF-CC@MoS2 using agricultural waste corncob (CC) by a simple green hydrothermal carbonization method may provide a promising alternative for the multi-targeted removal of coexisted antibiotics from real water, meanwhile recovering resources. © 2022, The Authors. All rights reserved.

关键词： Antibiotics

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Glutamate and aspartate alleviate testicular/epididymal oxidative stress by supporting antioxidant enzymes and immune defense systems in boars

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Science China(Life Sciences) 2020年第1期63卷 116-124页

作者： Wenjie Tang Jian Wu Shunshun Jin Liuqin He Qinlu Lin Feijun Luo Xingguo He Yanzhong Feng Binsheng He Pingping Bing Tiejun Li Yulong Yin Hunan International Joint Laboratory of Animal Intestinal Ecology and Health Laboratory of Animal Nutrition and Human HealthCollege of Life SciencesHunan Normal UniversityChangsha 410081China Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesHunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic ProcessNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionChangsha 410125China National Engineering Laboratory for Deep Process of Rice and Byproducts Hunan Key Laboratory of Grain-oil Deep Process and Quality ControlHunan Key Laboratory of Processed Food for Special Medical PurposeCollege of Food Science and EngineeringCentral South University of Forestry and TechnologyChangsha 410004China Academics Working Station at The First Affiliated Hospital Changsha Medical UniversityChangsha 410219China Sichuan Academy of Animal Sciences Animal Breeding and Genetics Key Laboratory of Sichuan ProvinceChengdu 610066China ^Changsha Green LecrfBiotechnology Co. Ltd.Changsha 610066Hunan Heilongjiang Academy of Agricultural Sciences Harbin 150086China

Several potential oxidative agents have damaging effects on mammalian reproductive *** study was conducted to investigate the effects of glutamate(Glu)and aspartate(Asp)supplementation on antioxidant enzymes and immune defense systems in the outer scrotum of boars injected with H2O2.A total of 24 healthy boars were randomly divided into 4 treatment groups:control(basal diet,saline-treated),H2O2(basal diet,H2O2-challenged outer scrotum(1 m L kg^–1 BW)),Glu(basal diet+2%Glu,H2O2-challenged),and Asp(basal diet+2%Asp,H2O2-challenged).Our results showed that both Glu and Asp supplementation improved testicular morphology and decreased the genital index in the H2O2-treated *** and Asp administration increased the antioxidant enzyme activities and affected the testicular inflammatory cytokine secretion but had no effect on sex hormone ***,the m RNA expression of CAT,Cu Zn SOD,and GPx4 was altered in the testes and epididymis of boars treated with Asp and *** and Asp supplementation also modulated the expression of TGF-β1,IL-10,TNF-α,IL-6 and IL-1βin the testis and *** results indicate that dietary Glu and Asp supplementation might enhance antioxidant capacity and regulate the secretion and expression of inflammatory cytokines to protect the testes and epididymis of boars against oxidative stress.

关键词： glutamate aspartate boars oxidative stress inflammatory cytokines

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