磷酸二氢钙协同氧化铝修复铅污染土壤的研究  

Effect of Calcium Dihydrogen Phosphate and Alumina on the Leaching Toxicity of Lead from Contaminated Soil

作　　者：曹园城 严欢 刘超 刁志龙 吴双 李兵 CAO Yuancheng;YAN Huan;LIU Chao;DIAO Zhilong;WU Shuang;LI Bing(Chongqing Huiya Environmental Protection Engineering Co.Ltd.,Chongqing 4000054,China;Sichuan Sipu Detection Technology Service Co.Ltd.,Chengdu 610041,China;College of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆汇亚环保工程有限公司,重庆400054 [2]四川实朴检测技术服务有限公司,四川成都610041 [3]重庆理工大学化学化工学院,重庆400054

出　　处：《环境影响评价》2023年第2期113-118,共6页Environmental Impact Assessment

基　　金：重庆市科技创新应用示范工程(cstc2018jszx-cyzdX0019)。

摘　　要：采用《固体废物浸出质量浓度浸出方法 硫酸硝酸法》(HJT 299—2007)对稳定化后污染土壤中铅浸出质量浓度进行测定,并结合土壤样品的扫描电镜分析和铅在土壤中的形态变化,分析了污染土壤中铅稳定化的作用机理。实验结果表明:三种不同药剂均能降低铅的浸出质量浓度(磷酸二氢钙复配氧化铝>磷酸二氢钙>氧化铝);当磷酸二氢钙添加质量比为2%,氧化铝添加质量比为3%时,稳定化后污染土壤中铅浸出质量浓度能满足地下水Ⅲ类标准;磷酸二氢钙与氧化铝施加入土壤后,能有效降低污染土壤中铅弱酸可提取态含量,增加铅残渣态含量,同时也增强了土壤的致密性,从而降低铅的浸出质量浓度。说明磷酸二氢钙协同氧化铝处置铅污染土壤有较好的工程应用价值。《Soild waste-extraction procedure for leaching toxicity-sulphuric acid&nitric acid method》(HJT 299—2007)was used to determine the leaching mass concentration of Pb in the contaminated soil after stabilization,and the mechanism of Pb stabilization in the contaminated soil was analyzed by combining the scanning electron microscope analysis of soil samples and the morphological changes of Pb in the soil.The experimental results showed that all three different agents could reduce the leaching mass concentration of lead(calcium dihydrogen phosphate compounded with alumina>calcium dihydrogen phosphate>alumina).When the mass ratio of adding calcium dihydrogen phosphate was 2%and the mass ratio of adding alumina 3%,the leaching mass concentration of contaminated soil after stabilization can meet the national groundwater class III standard.The application of calcium dihydrogen phosphate and alumina into the soil can effectively reduce the content of lead in the weak acid extractable state and increase the content of lead in the residue state in the contaminated soil,while the denseness of the soil is enhanced,thus reducing the leaching toxicity of lead.It indicates that calcium dihydrogen phosphate in cooperation with alumina has good engineering application value for the disposal of lead-contaminated soil.

关 键 词：土壤 铅污染 浸出质量浓度 形态变化 

分 类 号：X53[环境科学与工程—环境工程]