为了解决重金属铬污染带来的土壤及地下水污染问题,以沈阳铬渣堆场污染土为研究对象,进行水泥固化重金属铬污染土中Cr(VI)和Cr(Ⅲ)试验研究,测定了水泥掺量、养护龄期、铬不同含量及价态对固化土体的无侧限抗压强度及淋滤特性影响.结果表明,水泥是Cr(VI)和Cr(Ⅲ)污染土的有效固化剂,水泥掺量以20%为宜;Cr(VI)和Cr(Ⅲ)对固化土强度都具有弱化效应,Cr(Ⅲ)弱化效应更明显;SEM图从微观上解释了水泥固化铬污染土强度的变化,该变化与无侧限抗压强度试验结果一致.
In order to solve the problems of soil and groundwater pollution caused by heavy metal chromium, the Cr (VI) and Cr (III) test research on the cement solidified soil was carried out in the polluted soil of Shenyang chromium slag.The determination of cement content, curing period, different content and valence of chromium were tested to affect the unconfined compressive strength and leaching characteristics of solidified soil.The results show that the cement is an effective curing agent for Cr (VI) and Cr (III) contaminated soil, and the cement content is 20%.Cr (VI) and Cr (III) have a weakening effect on the strength of solidified soil and Cr (III) weakening effect is more obvious.The change of the strength of the solidified chromium contaminated soil is explained from the SEM images, which is consistent with the experimental results of unconfined compressive strength.
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