有色金属冶炼厂周边砷镉复合污染土壤的钝化材料研究  

Research on Passivation Materials for As and Cd Compound Contaminated Soil Around Non-ferrous Metal Smelters

作　　者：邓林 戴青云 周金泉 桂娟 和君强 符云聪 刘代欢 DENG Lin;DAI Qingyun;ZHOU Jinquan;GUI Juan;HE Junqiang;FU Yuncong;LIU Daihuan(Yonker Environmental Protection Co.,Ltd.,Changsha 410330,China;National Engineering Research Center for Soil Nutrient Management and Pollution Remediation,Nanjing 210008,China)

机构地区：[1]永清环保股份有限公司,长沙410330 [2]土壤养分管理与污染修复国家工程研究中心,南京210008

出　　处：《土壤》2023年第3期619-625,共7页Soils

基　　金：中南有色金属冶炼场地综合防控及再开发安全利用技术研发与集成示范项目(2018YFC1802700);冶炼场地与周边重金属原位生物固定稳定修复技术及装备研发应用示范项目(2018YFC1802702)资助。

摘　　要：为筛选适宜有色金属冶炼厂周边砷(As)镉(Cd)污染土壤修复的复合钝化材料,通过室内模拟试验,研究了包含2,4,6-三巯基均三嗪三钠(TMT)、铁盐、黏土矿物、铝基材料等材料的最优复配配方。结果显示:相同试验条件下,添加C1(黏土矿物+TMT)、C2(钙镁磷肥+铁盐+沸石+TMT)、C3(铁盐+铝基材料+TMT)三种钝化材料后,有色金属冶炼厂周边土壤中酸浸提态As、Cd浓度均达到GB3838—2002《地表水环境质量标准》Ⅳ类标准。随着时间的推移,添加1.0%的C3材料钝化重金属As、Cd效果最好,其中,酸浸提态As、Cd含量降低率最高可达96.95%、99.37%。通过Tessier法形态分析可知,C3钝化材料能使重金属As、Cd的形态从可交换态、铁锰氧化物结合态慢慢向残渣态转化,起到同时钝化As、Cd的效果,降低As、Cd的迁移能力,从而降低冶炼厂周边As、Cd重金属污染环境风险。In order to screen out the composite passivation materials suitable for the remediation of arsenic(As)cadmium(Cd)contaminated soil around non-ferrous metal smelters,2,4,6-trimine trisodium(TMT),iron salt,clay minerals and aluminum-based material were selected and the optimal compound formula for Cd and As passivation was studied.The results showed that under the same test conditions,after adding three passivation materials:C1(clay mineral+TMT),C2(calcium,magnesium and phosphorus fertilizer+iron salt+zeolite+TMT),C3(iron salt+aluminum-based material+TMT),the concentrations of acid soluble As and Cd in the soils around the non-ferrous metal smelter had reached the Category IV Standard of GB 3838—2002"Environmental Quality Standard for Surface Water".With the passage of time,adding 1.0%C3 had the best passivation effect.Among them,the reduction rates of acid soluble As and Cd concentrations could be up to 96.95%and 99.37%,respectively.Tessier five-step extraction analysis showed that C3 slowly transferred the forms of As and Cd from the exchangeable form and iron-manganese oxide combined form to the residual form,suggesting its effect of passivating As and Cd at the same time,thus could reduce the migration ability of As and Cd,and reduce the pollution risk of As and Cd in the environment around the smelter.

关 键 词：有色金属冶炼厂 砷、镉 2 4 6-三巯基均三嗪三钠(TMT) 铁盐 铝基材料 钝化 

分 类 号：X53[环境科学与工程—环境工程]