铬盐厂遗留土壤淋洗-还原联合修复

Leaching and Reduction Remediation for Chromium Contaminated Soil of Chromate Plant

以某铬盐厂搬迁遗留地块为研究对象,采用淋洗、还原稳定联合技术对铬污染土壤进行修复,通过不同的单因子试验研究,确定最佳淋洗剂及优化条件,同时优化后续土壤、废液处理条件,达到特定的修复目标。实验结果表明:选用硫酸为淋洗剂,可以有效去除土壤总Cr,硫酸亚铁-石灰联合使用可以有效去除土壤Cr^(6+),亚硫酸氢钠-生石灰联合使用可以有效去除废液Cr^(6+)、总Cr。

The work investigated the chromium contaminated soil from a chromate plant,with the method of leaching and stability reduction remediation for chromium contaminated soil. Single factor experiments were conducted to determine the best leaching agent and optimized conditions, and optimize the following soil, waste liquid treatment conditions for a specific remediation goal. The results show that sulfuric acid was used as leaching agent, can effectively remove the total Cr,the use of ferrous sulfate and lime can effectively remove Cr^6＋, sodium bisulfate-lime combination can effectively remove the waste liquid of Cr^6＋, total Cr.