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以甘肃省某铅锌冶炼厂高浓度铅(Pb)、锌(Zn)和镉(Cd)复合污染场地为对象,开展新型固化剂SPC原位固化稳定化(S/S)技术修复现场试验研究。进行含水率、p H值、浸出毒性和重金属形态分布和动力锥贯入试验,以考察修复前后污染土理化、浸出及强度特性变化,评价SPC原位S/S技术的修复效果,并初步探讨相关机制。试验结果表明SPC原位S/S技术能显著降低污染土含水率,提高其p H值;修复后Pb,Zn和Cd浸出浓度值显著降低,且均能满足相应限值要求;SPC修复能够有效降低土中重金属弱酸提取态含量,并将其转化为残渣态,同时显著提高土层贯入阻力值。提高SPC掺量可进一步增强其对污染土的修复效果。
A field test study of the new curing agent SPC in situ curing stabilization (S / S) was carried out in the contaminated sites of Pb, Zn and Cd contaminated by a certain lead-zinc smelter in Gansu Province. . The water content, p H value, leaching toxicity, heavy metal speciation distribution and dynamic cone penetration test were used to study the physical and chemical properties of leachate and soil before and after remediation. The effect of SPC in situ S / S technique was evaluated and discussed Related mechanisms. The experimental results show that in situ S / S technology of SPC can significantly reduce the water content of contaminated soil and increase its p H value. The leaching concentration of Pb, Zn and Cd after remediation significantly decrease, and both can meet the corresponding limits; SPC can effectively repair Reduce the heavy metal content of soil extractables, and convert it into the residue state, while significantly increasing soil penetration resistance value. Increasing the amount of SPC can further enhance its remediation effect on contaminated soil.