Biochar-supported nano-scale zerovalent iron activated persulfate for remediation of aromatic hydrocarbon-contaminated soil:an in-situ pilot-scale study  

作　　者：Yu Zeng Tai Li Yingzhi Ding Guodong Fang Xiaolei Wang Bo Ye Liqiang Ge Juan Gao Yujun Wang Dongmei Zhou 

机构地区：[1]Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,People’s Republic of China [2]University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China [3]School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164,China [4]School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,People’s Republic of China [5]Geological Survey of Jiangsu Province,Nanjing 210018,People’s Republic of China [6]State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210023,People’s Republic of China

出　　处：《Biochar》2022年第1期122-133,共12页生物炭（英文）

基　　金：the National Key Research and Development Program of China(2018YFC1802006,2017YFA0207001);the National Natural Science Foundation of China(42022049,42130707,and 42107045);the 145 Program of Institute of Soil Science(ISSASIP2213).

摘　　要：Biochar supported nano-scale zerovalent iron(nZVI/BC)for persulfate(PS)activation has been studied extensively for the degradation of pollutants on the lab scale,but it was rarely applied in practical soil remediation in the field.In this research,we developed a facile ball-milling method for the mass production of nZVI/BC,which was successfully applied to activate persulfate for the remediation of organic polluted soil on an in-situ pilot scale.In-situ high-pressure injection device was developed to inject nZVI/BC suspension and PS solution into the soil with a depth of 0-70 cm.The removal efficiency of target pollutants such as 2-ethylnitrobenzene(ENB,1.47-1.56 mg/kg),biphenyl(BP,0.19-0.21 mg/kg),4-(methylsulfonyl)toluene(MST,0.32-0.43 mg/kg),and 4-phenylphenol(PP,1.70-2.46 mg/kg)at different soil depths was 99.7%,99.1%,99.9%and 99.7%,respectively,after 360 days of remediation.The application of nZVI/BC significantly increased the degradation rates of contaminants by 11-322%,ascribed to its relatively higher efficiency of free radical generation than that of control groups.In addition,it was found that nZVI/BC-PS inhibited soil urease and sucrase enzyme activities by 1-61%within 55 days due to the oxidative stress for microbes induced by free radicals,while these inhibition effects disappeared with remediation time prolonged(>127 days).Our research provides a useful implementation case of remediation with nZVI/BC-PS activation and verifies its feasibility in practical contaminated soil remediation.

关 键 词：PERSULFATE BIOCHAR Nanoscale zerovalent iron PILOT-SCALE Enzyme activities 

分 类 号：X53[环境科学与工程—环境工程]