In-situ stabilisation followed by ex-situ composting for treatment and disposal of heavy metals polluted sediments  

作　　者：YU Guangwei LEI Hengyi BAI Tao LI Zhong YU Qiang SONG Xianqiang 

机构地区：[1]School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China [2]Department of Environmental Science and Engineering, South China Agriculture University, Guangzhou 510642, China

出　　处：《Journal of Environmental Sciences》2009年第7期877-883,共7页环境科学学报（英文版）

基　　金：supported by the Scientific and Tech- nological Planning Project of Guangdong Province (No. 2003A3040404);the Guangdong & Hong Kong Tech- nology Cooperation Funding (No. 2006A36702001)

摘　　要：An innovative in-situ stabilisation treatment followed by ex-situ sediment composting was tested for its ability to treat and dispose of heavy-metal-polluted sediments in a river near the Chinese Pearl Delta. First, polluted sediments were treated in-situ to stabilise the heavy metals. Then the treated sediments were dredged, dewatered and sent for high temperature aerobic composting （HTAC） treatment. Finally, the compost products were used as a fertiliser for fiver bank plants. The stabilisation efficiency of heavy metals during the process was investigated and the results are as follows： （1） using in-situ stabilisation, the extraction concentrations of Cu, Zn and Pb were reduced by 65.0%, 82.2% and 90.0%, respectively, which are much lower than the national standard given in the Identification Standard for Hazardous Waste （GB5085.3-1996）; （2） chemical fraction analysis showed that heavy metals were further stabilized during the HTAC treatment; （3） the concentrations of Cu, Zn and Pb in rainwater leachate through the river bank met the level of class V in the Environmental Quality Standards for Surface Water in China （GB3838-2002）. Therefore, using this new process, the toxicities of heavy metals in sediments were reduced markedly.An innovative in-situ stabilisation treatment followed by ex-situ sediment composting was tested for its ability to treat and dispose of heavy-metal-polluted sediments in a river near the Chinese Pearl Delta. First, polluted sediments were treated in-situ to stabilise the heavy metals. Then the treated sediments were dredged, dewatered and sent for high temperature aerobic composting （HTAC） treatment. Finally, the compost products were used as a fertiliser for fiver bank plants. The stabilisation efficiency of heavy metals during the process was investigated and the results are as follows： （1） using in-situ stabilisation, the extraction concentrations of Cu, Zn and Pb were reduced by 65.0%, 82.2% and 90.0%, respectively, which are much lower than the national standard given in the Identification Standard for Hazardous Waste （GB5085.3-1996）; （2） chemical fraction analysis showed that heavy metals were further stabilized during the HTAC treatment; （3） the concentrations of Cu, Zn and Pb in rainwater leachate through the river bank met the level of class V in the Environmental Quality Standards for Surface Water in China （GB3838-2002）. Therefore, using this new process, the toxicities of heavy metals in sediments were reduced markedly.

关 键 词：contaminated sediments treatment and disposal heavy metal in-situ stabilisation resource utilisation 

分 类 号：X799.303.3[环境科学与工程—环境工程] X524