基于双重熵值修正法的小清河底泥修复方案比选

Comparison and Selection of Remediation Scheme of Xiaoqing River Sediment Based on Double Entropy Correction Method

摘要:

弃土场污染底泥修复是河道防洪综合治理工程生态体系的主要改造内容之一。小清河防洪综合治理工程干流扩挖段弃土区出现的底泥污染物主要为为六价铬和砷等重金属，需要优选底泥污染物修复方案。本研究选取5个评价指标构建了污染底泥修复评价指标体系，在相对熵的专家打分修正的基础上，通过熵值G1法计算了指标权重，根据权重优选小清河污染底泥修复方案。结果表明：重金属六价铬单一污染底泥适宜采用“异位化学还原+排入排渣场或资源利用”方案，重金属砷单一污染底泥宜采用水泥窑协同处置修复技术，六价铬一砷复合污染底泥适宜采用水泥窑协同处置修复技术。基于双重熵值修正法的方案比选法可以客观快速进行污染底泥处理方案优选。

Abstract:

The restoration of polluted sediment from the dumping site is one of the main contents of the ecological system transformation of river flood control comprehensive management project. In Xiaoqing River flood control project, the pollutants in the bottom mud are mainly heavy metals such as hexavalent chromium and arsenic. In this study, five evaluation indexes were selected to construct an evaluation index system for the remediation of contaminated sediment.Based on the expert scoring and correction of relative entropy, the index weights were calculated by the entropy G1 method, and the remediation scheme of Xiaoqing River contaminated sediment was selected according to the weights. The results show that the solution of "ectopic chemical reduction + discharge into slag field or resource utilization" is suitable for the heavy metal hexavalent chromium single contaminated sediment, the cement kiln coordinated disposal and restoration technology is suitable for the heavy metal arsenic single contaminated sediment, and the cement kiln coordinated disposal and restoration technology is suitable for the hexavalent chromium-arsenic complex contaminated sediment. The scheme selection method based on the double entropy correction method can be used to optimize the treatment scheme of contaminated sediment objectively and quickly.