不同稳定化药剂对含Ni重金属污染土壤的稳定化效果研究

Experiments on Stabilization Effect of Different Stabilizing Agents on Soil Contaminated with Ni Heavy Metal

以含Ni重金属污染土壤为研究对象,分别添加土壤调理剂、Cd/Pb高效复合改良剂和CCT01药剂对重金属污染土壤进行稳定化处理,考察不同稳定化药剂及稳定化药剂的投加量对含Ni重金属污染土壤的稳定化影响。结果表明:三种药剂中CCT01药剂对重金属污染土壤中镍的稳定化效果较好,其次是土壤调理剂。其中,CCT01药剂的最佳投加量在5%～8%,当其投加量为5%时,土壤中重金属镍的浸出毒性浓度为0.78 mg/L,低于《污水综合排放标准》中镍的最高允许排放浓度1.0 mg/L;土壤调理剂的投加量为10%时,土壤中重金属镍的浸出毒性浓度为0.92 mg/L;Cd/Pb高效复合改良剂的投加量在15%时,土壤中重金属镍的浸出毒性浓度为1.14 mg/L,仍高于《污水综合排放标准》中镍的最高允许排放浓度。

Taking soil contaminated with Ni heavy metals as the research object, soil conditioner, Cd/Pb effective compound modifier and CCT01 agent were respectively added to stabilize the soil contaminated with heavy metals, the effects of different stabilizing agents and dosage of stabilizing agents on the stabilization of soil contaminated with Ni heavy metals were investigated. The results showed that CCT01 had best stabilization effect on soil contaminated with nickel heavy metal among the three agents, the second was soil conditioner. Among them, the optimal dosage of CCT01 agent was 5 %~8 %. When the dosage of CCT01 agent was 5 %, the leaching toxicity concentration of heavy metal nickel in the soil was 0.78 mg/L, which was lower than the maximum allowable concentration of nickel in the comprehensive sewage discharge standard of 1.0 mg/L. When the dosage of soil conditioner was 10 %, the leaching toxicity concentration of heavy metal nickel in the soil was 0.92 mg/L. When the addition amount of Cd/Pb efficient composite improver was 15 %, the leaching toxicity concentration of heavy metal nickel in the soil was 1.14 mg/L, which was still higher than the maximum allowable discharge concentration of nickel in the comprehensive sewage discharge standard.