硫代硫酸钠处置含铬污染土壤效果及形态分析  

Effect and Morphology of Chromium Contaminated Soil Treated with Sodium Thiosulfate

作　　者：高焕方[1] 李亚玲 王东[2] 郑佳[2] 张恩智 严欢 李聪 GAO Huanfang;LI Yaling;WANG Dong;ZHENG Jia;ZHANG Enzhi;YAN Huan;LI Cong(College of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054)

机构地区：[1]重庆理工大学化学化工学院,重庆400054 [2]重庆市固体废物管理中心,重庆400015 [3]重庆汇亚环保工程有限公司,重庆400041

出　　处：《工业安全与环保》2019年第9期81-83,87,共4页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(21406023);重庆市社会民生科技创新专项(cstc2015shmszx20005);重庆市教委基金(KJ1400901);重庆市基础科学与前沿技术研究专项(cstc2014icyjA20008);重庆市科委自然科学基金(cstc2013icyjA20008);场地污染土壤成套淋洗装备研发及应用示范(cstc2018jszx-cyzdX0019)

摘　　要：研究了用不同质量比的硫代硫酸钠对铬污染土壤的治理效果及治理过程中铬的形态变化,结果表明,硫代硫酸钠对铬污染土壤在短期内修复具有较好的效果,在投加比为3%的基础上,继续增加硫代硫酸钠的用量,虽然六价铬浸出浓度在降低,但幅度不明显。六价铬含量随养护时间的增加而逐渐减少,投加比例越高其效果越明显;在形态分析中,生物可利用的水溶态和弱酸提取态中的铬均在减少;在硫代硫酸钠修复过程中pH值无明显变化。因此,用硫代硫酸钠处置铬污染土壤能明显降低六价铬浸出浓度和六价铬含量,且满足修复目标要求。结合经济效益和治理效果,硫代硫酸钠投加比为3%处置含铬污染土壤效果最佳。The effect of sodium thiosulfate on the treatment of chromium in contaminated soil with different mass ratio and the change of chromium in the treatment process were studied.The results showed that sodium thiosulfate had a good effect on the remediation of chromium contaminated soil in the short term.On the basis of the ratio of 3%,the dosage of sodium thiosulfate continued to increase,although the hexavalent chromium leaching concentration was reduced,the increase was not obvious.The content of hexavalent chromium decreased gradually with the increase of curing time and the more the ratio of disposal,the more effective it was.In the form analysis,the chromium in the water-soluble and weak acid extraction states of the bioavailable bioavailability was reduced,and the pH did not change obviously during the repair process of sodium thiosulfate.Therefore,the disposal of chromium contaminated soil by sodium thiosulfate can significantly reduce the concentration of hexavalent chromium and the content of hexavalent chromium,and meet the requirements of restoration target.Combined with economic benefits and management effects,the disposal ratio of 3%is the best for disposing chromium contaminated soil.

关 键 词：硫代硫酸钠 浸出浓度 六价铬含量 形态分析 

分 类 号：TQ1[化学工程]