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remediation of copper polluted red soils with clay materials

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Journal of Environmental Sciences 2011年第3期23卷 461-467页

作者： Gangya Zhang Yunqing Lin Mingkuang Wang State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Department of Agricultural Chemistry 'National' Taiwan University Taipei 10617 Taiwan

Attapulgite and montmorillonite were utilized to remediate heavy metal polluted red soils in Guixi City, Jiangxi Province, China. The effects of clay minerals on availability, chemical distribution, and biotoxicity of Cu and Zn were evaluated. The results provided a reference for the rational application of clay materials to remediate heavy metal contaminated soils. From the sorption experiment, the maximum adsorbed Cu2＋ by attapulgite and montmorillonite was 1501 and 3741 mg/kg, respectively. After polluted red soil was amended with attapulgite or montmorillonite and cultured at 30 and 60 days, soil pH increased significantly compared to the control. An 8% increase in the amount of montmorillonite in soil and 30 days incubation decreased acid exchangeable Cu by 24.7% compared to the control red soil. Acid exchangeable Cu decreased with increasing effect reached at a dose of 8%. Results also showed that the Cu amounts of attapulgite and montmorillonite, with best remediation poisoning effect on earthworms was reduced with the addition of attapulgite and montmorillonite. Montmorillonite showed the best effect, with the addition of a 2% dose the mortality of earthworms decreased from 60% to zero compared to the control. Our results indicated that the bioavailability of Cu in soils was reduced more effectively with the application of montmorillonite than attapulgite.

关键词： amendments montmorillonite attapulgite heavy metal polluted soil remediation

remediation of Ni^(2+)-contaminated water using iron powder and steel manufacturing byproducts

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Journal of Environmental Sciences 2006年第3期18卷 464-467页

作者： JIN Jian ZHAO Wei-rong XU Xin-hua HAO Zhi-wei LIU Yong HE Ping ZHOU Mi Department of Environment Engineering Zhejiang University Hangzhou 310027 China

Steel manufacturing byproducts and commercial iron powders were tested in the treatment of Ni^2＋-contaminated water. Ni^2＋ is a priority pollutant of some soils and groundwater. The use of zero-valent iron, which can reduce Ni^2＋ to its neural form appears to be an alternative approach for the remediation of Ni^2＋-contaminated sites. Our experimental data show that the removal efficiencies of Ni^2＋ were 95.15% and 94.68% at a metal to solution ratio of 20 g/L for commercial iron powders and the steel manufacturing byproducts in 60 min at room temperature, respectively. The removal efficiency reached 98.20% when the metal to solution ratio was 40 g/L for commercial iron powders. Furthermore, we found that the removal efficiency was also largely affected by other factors such as the pHs of the treated water, the length of time for the metal to be in contact with the Ni^2＋-contaminated water, initial concentrations of metal solutions, particle sizes and the amount of iron powders. Surprisingly, the reaction temperature appeared to have little effect on the removal efficiency. Our study opens the way to further optimize the reaction conditions of in situ remediation of Ni^2＋ or other heavy metals on contaminated sites.

关键词： zero-valent iron reduction remediation Ni^2+

Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1152-1159页

作者： Yingying Gu Albert T. Yeung Hongjiang Li Department of Environmental and Safety Engineering China University of Petroleum (East China) Qingdao 266580 China Department of Engineering The University of Hong Kong Pokfulam Road Hong Kong China Qingdao Water Group Co. Ltd. Qingdao 266002 China College of Mining Civil Engineering Taiyuan University of Technology Taiyuan 030024 China

Soil contamination by metals is a worldwide environmental problem. Electrokinetic extraction is a promising technology for in-situ remediation of contaminated soils of low hydraulic permeability. However, the extraction of metals is usually hindered by the high buffer capacity of natural soils. Organophosphonates are strong metal chelates as ethylenediaminetetraacetic acid(EDTA) which has been widely studied in the enhancement of electrokinetic remediation. In this study, batch desorption experiments and bench-scale electrokinetic extraction experiments were carried out to study the effect of two organophosphonates, i.e.,(nitrilotrimethylene)triphosphonate(NTMP) &(ethylenedinitrilo)-tetramethylenephosphonate(EDTMP), on the extraction of cadmium from a natural clay in comparison with EDTA. Results of the batch desorption experiments showed that more than 75% of the sorbed cadmium could be dissolved into solution using 0.1 mol·L^(-1) organophosphonates or EDTA in the wide p H range of 1–11. Results of the electrokinetic extraction experiments showed that the cadmium spiked in the specimen migrated towards the anode with the enhancement of NTMP,EDTMP, and EDTA under a constant voltage gradient of approximately 1.0 V·cm-1. Although cadmium mobilization enhanced by EDTA was more efficient than that by the organophosphonates, accumulation of cadmium was observed in the vicinity of the anode. The average removal efficiencies of cadmium from the soil after approximately 5 days of electrokinetic extraction enhanced by 0.1 mol·L-1 NTMP(22.8%) and EDTMP(22.4%) were higher than that by 0.1 mol·L^(-1) EDTA(15.1%).

关键词： Electrochemistry remediation Desorption Organophosphonate EDTA High buffer capacity

Mechanism of combination membrane and electro-winning process on treatment and remediation of Cu^(2+) polluted water body

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Journal of Environmental Sciences 2009年第6期21卷 764-769页

作者： ZHANG Linnan WU Yanjun QU Xiaoyan LI Zhenshan NI Jinren Department of Environmental Engineering Peking University The Key Laboratory of Water and Sediment Sciences Ministry of Education of China Beijing 100871 China Shenzhen Graduate School Peking University Shenzhen 518055 China

Mechanism of treatment and remediation of synthetic Cu^2＋ polluted water body by membrane and electro-winning combination process was *** influences of electrolysis voltage,pH,and electrolysis time on the metal recovery effciencies were *** between trans-membrane pressure drop（△P）,additions ratio,initial Cu^2＋ concentration on operating effciency,stability of membrane and the possibility of water reuse were also *** morphology of membrane and electrodes were observed using scanning electron microscopy（SEM）,the composition of surface deposits was ascertained using combined energy dispersive X-ray spectroscopy（EDX） and atomic absorption *** results showed that using low pressure reverse osmosis（LPRO）,Cu^2＋ concentration could increase from 20 to 100 mg/L or even higher in concentrated solutions and permeate water conductivity could be less than 20 μS/*** addition of sodium dodecy/sulfate sodium dodecyl sulfate improved Cu^2＋ removal effciency,while EDTA had little side *** electro-reduction process,using plante electrode cell,Cu^2＋ concentration could be further reduced to 5 mg/L,and the average current effciency ranged from 9% to 40%.Using 3D electrolysis treatment,Cu^2＋ concentration could be reduced to 0.5 mg/L with a current effciency range 60%-70%.

关键词： heavy metal water body membranes electro-winning remediation

Layered double hydroxides:Scale production and application in soil remediation as super-stable mineralizer

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Chinese Journal of Chemical Engineering 2022年第1期35卷 42-48页

作者： Fangqi Mao Peipei Hao Yuquan Zhu Xianggui Kong Xue Duan State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Soil contamination by heavy metals has presented severe risks to human health through food *** one of the most promising remediation technologies,in-situ immobilization strategy has been widely adopted in ***,considering the large quantities of contaminated soil,it is still a huge challenge to design low-cost amendments with strong and long-term immobilization *** double hydroxides(LDHs)have drawn tremendous attention in fundamental research and practical application because of their unique ***,owing to its super-stable mineralization effect to heavy metal ions,LDHs have exhibited great potential in the field of soil *** this work,we mainly focused on the scale production strategy of LDHs with low-cost,and its application in soil ***,several key challenges in using LDHs as amendments for immobilization of heavy metal ions are *** hope that this mini-review could shed light on the sustainable development of LDHs as amendment for heavy metals in future research directions.

关键词： Heavy metals Pollution remediation Layered double hydroxides Scale-up Super-stable mineralization effect

The application and progress of bioelectrochemical systems (BESs) in soil remediation: A review

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Green Energy & Environment 2021年第1期6卷 50-65页

作者： Tian Li Ruixiang Li Qixing Zhou MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution ControlCollege of Environmental Science and EngineeringNankai UniversityNo.38 Tongyan RoadJinnan DistrictTianjin300350China

Soil pollution endangers human health and ecological balance,which is why finding a highly efficient way to deal with pollutants is *** method is an environmentally friendly treatment *** systems(BESs),which combine electrochemistry with biological methods,have been widely used to remediate polluted environments,including wastewater,sludge,sediment,and *** BESs,redox reactions occur on electrodes with electroactive bacteria,which convert pollutants into low-polluting or nonpolluting *** BESs being a promising technology in the remediation field,the decontamination mechanisms and applications in soil conducted by BESs have attracted much ***,to better understand the research progress of BESs,this paper mainly summarizes the mechanism of different classified *** applications of microbial fuel cells(MFCs)in four pollutants(petroleum,heavy metals,pesticides,antibiotics)and the possible applications of microbial electrolysis cells(MECs)in soil are *** main problems in BESs and possible future development directions are also evaluated.

关键词： Polluted soil Bioelectrochemical systems remediation Application

Advances in Fe(Ⅲ)bioreduction and its application prospect for groundwater remediation:A review

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Frontiers of Environmental Science & Engineering 2019年第6期13卷 11-21页

作者： Yu Jiang Beidou Xi Rui Li Mingxiao Li Zheng Xu Yuning Yang Shaobo Gao School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing 100012China Municipal and Environmental Engineering College Jilin Jianzhu UniversityChangchun 130118China School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China

Microbial Fe(Ⅲ)reduction is a significant driving force for the biogeochemical cycles of C,O,P,S,N,and dominates the natural bio-purification of contaminants in groundwater(e.g.,petroleum hydrocarbons,chlorinated ethane,and chromium).In this review,the mechanisms and environmental significance of Fe(Ⅲ)(hydro)oxides bioreduction are *** with crystalline Fe(Ⅲ)(hydro)oxides,amorphous Fe(m)(hydro)oxides are more *** and electron shuttle both play an important role in microbial Fe(Ⅲ)*** restrictive factors of Fe(Ⅲ)(hydro)oxides bioreduction should be further investigated to reveal the characteristics and mechanisms of the *** will improve the bioavailability of crystalline Fe(Ⅲ)(hydro)oxides and accelerate the anaerobic oxidation efficiency of the reduction state ***,the approach to extract,culture,and incubate the functional Fe(Ⅲ)reducing bacteria from actual complicated environment,and applying it to the bioremediation of organic,ammonia,and heavy metals contaminated groundwater will become a research topic in the *** are a broad application prospects of Fe(Ⅲ)(hydro)oxides bioreduction to groundwater bioremediation,which includes the in situ injection and permeable reactive barriers and the innovative Kariz wells *** study provides an important reference for the treatment of reduced pollutants in contaminated groundwater.

关键词： Microbial Fe(Ⅲ)reduction Mechanism Groundwater contamination remediation

Potential risks of organic contaminated soil after persulfate remediation:Harmful gaseous sulfur release

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Journal of Environmental Sciences 2024年第1期135卷 1-9页

作者： Yuyang Long Zixiao Wu Xiaodong Ding Jiansong Chen Dongsheng Shen Jiali Shentu Cai Hui Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling Zhejiang Engineering Research Center of Non-ferrous Metal Waste RecyclingInstrumental Analysis CenterSchool of Environmental Science and EngineeringZhejiang Gongshang UniversityHangzhou 310012China Shangyu Yingtai Fine Chemical Co. Ltd.Shaoxing 312000China Hangzhou Ecological Environment Monitoring Center Hangzhou 310007China

Persulfate is considered a convenient and efficient remediation agent for organic contaminated ***,the potential risk of sulfur into the soil remediation by persulfate remains *** this study,glass bottles with different persulfate dosages and groundwater tables were set up to simulate persulfate remediation of organic pollutants(aniline).The results found sulfate to be the main end-product(83.0%–99.5%)of persulfate remediation after10 ***,H_(2)S accounted for 93.4%–99.4%of sulfur reduction end-products,suggesting that H_(2)S was the final fate of sulfur.H_(2)S was released rapidly after one to three days at a maximum concentration of 33.0 ppm,which is sufficient to make a person *** to the fitted curve results,H_(2)S concentration decreased to a safe concentration(0.15 ppm)after 20–85 ***,the maximum concentration of methanethiol reached 0.6 *** results indicated that secondary pollution from persulfate remediation could release harmful gases over a long ***,persulfate should be used more carefully as a remediation agent for soil contamination.

关键词： Gaseous sulfur release H_2S Long period potential risk Organic contaminated soil remediation Persulfate

Reagent elution combined with positive pressure filtration:A zero-discharge method for cyanide tailings remediation

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Journal of Environmental Sciences 2022年第3期34卷 376-384页

作者： Qiang Liu Yating Luo Jiyan Shi Department of Environmental Engineering College of Environmental and Resource ScienceZhejiang UniversityHangzhou 310058China Changchun Gold Research Institute Co.Ltd Changchun 130012China

At present, the cyanide gold extraction process is still the main technology for gold production. Generated cyanide tailings containing highly toxic substances exhibit potential environmental risks. These tailings are in urgent need of purification treatment, especially after being classified as hazardous waste. In this study, the impacts of elution methods, operating time, tailings/water ratios, reagent types on the elution rates of cyanide were investigated. Furthermore, the composite elution method developed in this research was extended for engineering. Results showed that the optimum elution conditions were determined to be: stirring elution, tailings/water ratio( M/V;1:1) and operating time(10-20 min). Besides, 4 reagents(sodium dodecyl benzene sulfonate, cyclodextrin, sodium silicate and calcium hydroxide) were selected from four categories of 21 reagents for further composite elution. The cyanide elution rate was the highest(90.7% ±0.1%) while the molar ratio of these 4 reagents was 5:2:2:1. Moreover, the combination of reagent elution and positive pressure filtration improved the elution efficiency of cyanide(92.6% ±0.8%). And the cyanide content in the toxic leaching solution was lower than the standard value(5.0 mg/L). Furthermore, the composite elution method developed in this study was also extended for engineering. The concentration of cyanide in the leachate was < 5.0 mg/L, and was stable during 189 days of detection. Notably, the effluent can be reused directly, or reused after further treatment. The zero discharge of effluents and solid wastes was realized in the processes. The above results provided supports for the engineering treatment of cyanide tailings.

关键词： Cyanide tailings Decyanation treatment remediation Engineering