In-situ stabilisation followed by ex-situ composting for treatment and disposal
of heavy metals polluted sediments |
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Authors: | YU Guangwei LEI Hengyi BAI Tao LI Zhong YU Qiang and SONG Xianqiang |
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Institution: | 1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;Department of Environmental Science and Engineering, South China Agriculture University, Guangzhou 510642, China 2. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China |
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Abstract: | 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 river 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 ieachate 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. |
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Keywords: | contaminated sediments treatment and disposal heavy metal in-situ stabilisation resource utilisation |
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