Remediation of Organochlorine Pesticide-Contaminated Soils by Surfactant-Enhanced Washing Combined with Activated Carbon Selective Adsorption  

作　　者：ZHANG Shengtian HE Yue WU Linna WAN Jinzhong YE Mao LONG Tao YAN Zhou JIANG Xin LIN Yusuo LU Xiaohua 

机构地区：[1]College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China) [2]State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing 210042 (China) [3]Environmental Science Research Institute, Huazhong University of Science and Technology, Wuhan 430074 (China) [4]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)

出　　处：《Pedosphere》2019年第3期400-408,共9页土壤圈（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 41571316, 41201311, and 41301278);the Environmental Protection Scientific Research Subject of Jiangsu Province, China (No. 2013026);the National High Technology Research and Development Program (863 Program) of China (No. 2009AA063103)

摘　　要：Remediation of organochlorine pesticide (OCP)-contaminated soils is urgently required especially in China. The present study investigated the removal of OCPs from two soils by triton X-100 (TX- 100)-enhanced washing coupled with powdered activated carbon (PAC) adsorption treatment of the solution. Two contaminated soils, including a silt clay contaminated w计h chlordene, dichloro- 2,2-6is(p-chlorophenyl)ethanes (DDDs), and dichlorodiphenyltrichloroethane (DDT) and a sandy loam containing chlordanes and mirex, were selected. Effects of varied operating parameters, including TX-100 dosage, liquid/soil (L/S) ratio, and extraction time, on the contaminant removal were examined. For both soils, OCP removal was clearly enhanced with increasing TX-100 in extraction solution and L/S ratio. Meanwhile, the removal efficacy was also impacted by soil texture and characteristics and contents of the contaminants. Moreover, by using PAC as an absorbent, a significant decrease in the contaminants in the extraction solutions was detected, and TX-100 could be further reused. Our investigation suggests that surfactant-enhanced washing combined with activated carbon selective adsorption would be an alternative to remediate OCP-contaminated soils.Remediation of organochlorine pesticide(OCP)-contaminated soils is urgently required especially in China. The present study investigated the removal of OCPs from two soils by triton X-100(TX-100)-enhanced washing coupled with powdered activated carbon(PAC) adsorption treatment of the solution. Two contaminated soils, including a silt clay contaminated with chlordene, 1,1-dichloro-2,2-bis(p-chlorophenyl)ethanes(DDDs), and dichlorodiphenyltrichloroethane(DDT) and a sandy loam containing chlordanes and mirex, were selected. Effects of varied operating parameters, including TX-100 dosage, liquid/soil(L/S) ratio, and extraction time,on the contaminant removal were examined. For both soils, OCP removal was clearly enhanced with increasing TX-100 in extraction solution and L/S ratio. Meanwhile, the removal effcacy was also impacted by soil texture and characteristics and contents of the contaminants. Moreover, by using PAC as an absorbent, a significant decrease in the contaminants in the extraction solutions was detected, and TX-100 could be further reused. Our investigation suggests that surfactant-enhanced washing combined with activated carbon selective adsorption would be an alternative to remediate OCP-contaminated soils.

关 键 词：chlordene DICHLORODIPHENYLTRICHLOROETHANE hydrophobic organic chemicals powdered activated carbon sodium dodecyl benzene SULFONATE TRITON X-100 

分 类 号：P[天文地球]