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Study on the long-term stability of Cr-contaminated soil in electroplating plant stabilized by calcium polysulfide

Study on the long-term stability of Cr-contaminated soil in ...

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中国土壤学会土壤环境专业委员会第二十次会议暨农田土壤污...

作者： RAN Yuling LUO Qishi LU Xin WANG Manli LIN Kuangfei CUI Changzheng State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Branch of Shanghai Yonker Environmental Protection Co. Ltd

In order to explore the long-term stability of chromium-contaminated soils in electroplating plants after stabilization, we conducted a study to evaluates the effect of calcium polysulfide(CPS) on Cr stabilization in soil, under acid rain leaching, freezing-thawing cycle, and alternate wetting and drying, providing methods and data support for long-term stability assessment of Cr-contaminated soil stabilization in electroplating plants. The results demonstrated that the high stabilization effect at molar ratio of CPS/Cr(Ⅵ) was 3, with the stable efficiencies of total chromium(TCr) and Cr(Ⅵ) of 99.6% and 99.9%, respectively. The release of TCr and Cr(Ⅵ) in CPS stabilized soil under acid rain can be well fitted to the cumulative release in the fast release phase and the release equilibrium phase using the modified Elovich equation and the first-order kinetic equation, respectively. Although the release concentration of TCr and Cr(Ⅵ) in CPS stabilized soil during releasing equilibrium phase were maintained in the range of 0.78 2.33 mg L and 0.125 0.243 mg L respectively, but the cumulative release content of TCr and Cr(Ⅵ) were 92 mg kg and 11 mg kg under 102 d acid rain environment by column test respectively. Freezing-thawing cycle reduce the leaching of TCr in the soil. After 15 times of wetting and drying alternates, the CPS-stabilized soil leaching TCr concentration was decreased by 0.01 mg L from 2.55 mg L. Acid rain leaching can be used as a sensitive indicator to evaluate the long-term stability of Cr-contaminated soil after stabilization.

关键词： Calcium polysulfide（CPS） Long-term stability chromium-contaminated soil Simulated acid rain leaching Freezing-thawing cycles Wetting and drying alternating

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