镁基稳定剂协同硅酸盐固化/稳定化处置铅污染土壤研究

采用镁基稳定剂协同硅酸盐固化/稳定化处置重金属污染土壤,以铅浸出浓度和药剂处理成本为综合指标确定稳定剂和固化剂的最优配比,并对处置机制及影响因素等探讨,为后期同类型的重金属污染土壤修复提供技术支持。研究结果表明,按照稳定剂添加比例2.5%与固化剂添加比例3%的最优配比处置后,土体重金属铅降低99.8%,可达到铅浸出修复目标值50μg/L的要求。

Study on the solidification / stabilization treatment of lead contaminated soil by magnesium based stabilizer combined with silicate

Magnesium-based stabilizer was used in coordination with silicate solidification/stabilization of heavy metal contaminated soil,the optimal ratio of stabilizer and curing agent was determined with lead leaching toxicity and agent treatment cost as comprehensive indexes,and the disposal mechanism and influencing factors were discussed,providing reference for the later remediation of heavy metal contaminated soil of the same type.The results showed that the addition ratio of stabilizer was 2.5% and that of curing agent was 3%.Under the optimal ratio,the weight of metal lead in the treated soil decreased by 99.8%,which could reach the target value of 50μg/L.