土壤镉砷复合污染修复剂筛选研究

Study on Selection of Remediation Agents for Soil Cadmium Arsenic Compound Pollution

本文以镉砷复合污染土壤为研究对象,从粘土矿物类、石灰性物质、金属氧化物、含磷矿物类等无机钝化剂中筛选出最佳镉、砷钝化剂,并将筛选出的最佳镉、砷钝化剂进行稳定化复配试验,优化出适用于镉砷复合污染土壤的“钙基 + 铁基 + 磷基”钝化剂复配配方,为镉砷复合污染土壤钝化技术应用提供数据支撑。复配钝化剂对镉砷复合污染土壤进行修复后,土壤镉、砷有效态含量均降低45%以上。

In this paper, taking the soil polluted by cadmium and arsenic as the research object, the best cad-mium and arsenic passivators were selected from inorganic passivators such as clay minerals, cal-careous substances, metal oxides and phosphorus containing minerals. The best cadmium and ar-senic passivators were tested for stabilization, and the compound formula of “calcium + iron + phos-phorus” passivator suitable for the soil polluted by cadmium and arsenic was optimized. It provides data support for the application of passivation technology in cadmium arsenic compound polluted soil. The effective contents of cadmium and arsenic in the soil were reduced by more than 45% after the compound passivator was used to repair the soil polluted by cadmium and arsenic.