多硫化钙对铬污染土的稳定性能及铬赋存形态试验研究

doi:10.13722/j.cnki.jrme.2017.1166

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摘要

采用多硫化钙(CaS₅)对铬污染土进行稳定化处理，基于浸出试验、碱性消解试验和形态提取试验，研究CaS₅添加量和养护龄期对污染土中铬赋存形态及浸出特性的影响规律。结果表明：随着CaS₅添加量和养护龄期的增加，Cr(VI)和总Cr的浸出浓度降低，稳定土中Cr(VI)的含量降低，当CaS₅/Cr(VI)的摩尔比为2时，Cr(VI)和总Cr的浸出浓度均低于我国危险废弃物鉴别标准(GB/T50853－2007)；当CaS₅/Cr(VI)摩尔比为3时，7 d龄期稳定土中Cr(VI)的含量低于我国土壤环境质量标准(GB15618－2008)中工业和商业用地的限值(30 mg/kg)；CaS₅可使稳定土在较长龄期内保持良好的还原性。形态提取试验结果表明：CaS₅添加量和养护龄期均会明显改变稳定土中铬的赋存形态，随着CaS₅添加量的增加，弱酸提取态的铬向可还原态、可氧化态转化；养护龄期的增加可促使铬从可还原态向可氧化态转化。铬形态分布的改变是铬污染土稳定性能变化根本原因。

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	张亭亭1
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	薛强1
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关键词 ：土力学, 铬污染土, 稳定化, 浸出特性, 多硫化钙, 形态演化

Abstract：

Calcium polysulfide(CaS₅) was used to stabilize chromium-contaminated soils. Leaching test，alkaline digestion test and sequential extractions test were conducted to investigate the influence of CaS₅ dosage and curing time on stabilization properties and chromium speciation of chromium-contaminated soils treated by CaS₅. Results showed that the leaching concentration(hexavalent chromium and total chromium) and hexavalent chromium content of the soil were decreased significantly with the increased CaS₅dosage and curing time. Leaching concentration(hexavalent chromium and total chromium) were all met the China regulatory limit (GB/T50853–2007)，when CaS₅/Cr(VI) molar ratio was 3.With CaS₅/Cr(VI) molar ratio of 5，the amount of Cr(VI) in the soil met the China Environmental Regulation for industrial reuse[Cr(VI)＜30 mg/kg]. Sequential extractions test showed that majority of acid soluble fraction of chromium was converted to reducible fraction and oxidisable fraction with CaS₅ stabilized. With curing time increased reducible fraction of chromium was converted to oxidisable fraction. The changing in stabilize properties of stabilized soil can be attributed to the change of chromium speciation.

Key words： soil mechanics chromium contaminated soil stabilization leaching properties Ferrous sulfate speciation evolution

引用本文:

张亭亭1，2，魏明俐1，3，熊欢1，4，李江山1，3，薛强1，3. 多硫化钙对铬污染土的稳定性能及铬赋存形态试验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4282-4289.
ZHANG Tingting1，2，WEI Mingli1，3，XIONG Huan1，4，LI Jiangshan1，3，XUE Qiang1，3. Chromium speciation and leaching behaviors of chromium contaminated soil stabilized by calcium polysulfide. , 2017, 36(S2): 4282-4289.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1166 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4282

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