建设用地重金属污染修复技术筛选模型构建

Construction of screening model for remediation of heavy metal pollution in construction land

为解决试验优选建设用地重金属污染修复技术效率低和过程繁琐等问题,确定了建设用地重金属污染修复技术筛选指标,建立了修复技术筛选指标体系,基于改进的层次分析法、改进的熵权法、乘法集成法与改进的逼近理想解排序法优选重金属污染土壤修复技术,构成建设用地重金属污染修复技术筛选模型.通过工程案例将筛选模型与其他模型和传统方法进行对比,分析检验该模型的实际应用能力与可靠性.验证结果表明,云南个旧某选冶渣场重金属污染土壤的修复应用适用性顺序为:化学钝化>土壤淋洗>电动修复>工程物理,四川会理某选冶废渣场备选四种修复技术方案的相对贴近度P=[0.0519,0.0502,0.0830,0.0870],优选的化学钝化技术与土壤固化技术符合现场实际,证明构建的技术筛选模型具备高效性和准确性,对完善重金属污染修复技术筛选流程具有重要理论意义和工程应用价值.

To solve the problems of low efficiency and cumbersome process of remediating heavy metal contamination in construction land,this article determined the screening indicators for heavy metal pollution remediation technology in construction land,established the screening indexes for remediation technology,selected optimum heavy metal contaminated soil remediation technology based on improved analytic hierarchy process,improved entropy weight method,multiplication integration method,and improved approximate ideal solution sorting method,and constructed a screening model for heavy metal pollution remediation technology in construction land.The screening model was compared with other models and traditional methods using engineering cases,and the usability and reliability of the model are assessed and verified.The verification results show that the application order of remediation of heavy metal contaminated soil in a sorting and smelting residue field in Gejiu,Yunnan is as follows:chemical passivation>soil leaching>electric restoration>engineering physics.The relative closeness of the four alternative remediation technologies in a smelting waste site in Huili,Sichuan Province is P=[0.0519,0.0502,0.0830,0.0870].The optimized chemical passivation technology and soil solidification technology are in line with the field practice.It is demonstrated that the constructed technical screening model is efficient and accurate,which has significant theoretical value and engineering application value for enhancing the heavy metal pollution remediation technology screening process.