某典型化工污染场地土壤修复方案研究  

Study on the remediation plan for typical pollution sites contaminated by chemical enterprise

作　　者：李定龙[1] 徐冉[1] 吕浩[1] 万玉山[1] 杨彦[1] 

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164

出　　处：《环境污染与防治》2015年第7期94-100,共7页Environmental Pollution & Control

基　　金：江苏省科技计划项目(No.BY2014037-21);常州市科技项目(No.KYZ14020346)

摘　　要：以典型化工污染场地为研究对象,构建适合该场地的修复技术筛选体系,筛选最佳修复方法。根据特征污染筛选结果、场地修复目标及业主需求等因素,通过室内模拟实验、施工现场微调等方法,确定污染场地最优修复方案。结果表明,作为Cd、苯并[a]芘复合污染场地,根据筛选体系结合Topsis法进行评估,确定场地修复技术为异位化学淋洗。运用响应曲面法,采用BoxBehnken设计多因素实验进行室内模拟,确定最佳修复条件。采用0.6mol/L柠檬酸与20g/Lβ-环糊精进行复配的淋洗剂,在pH=3.0、淋洗温度35.00℃、液固比(淋洗剂与土壤的体积质量比)6.00mL/g、搅拌强度320.00r/min下,淋洗4次,每次淋洗3.4h,对某化工污染场地进行修复,修复后土壤中Cd、苯并[a]芘的去除量分别为69.88、39.20mg/kg,去除率分别达80.14%、70.50%,达到预期修复目标。The best method for the remediation of the contaminated soil in a typical chemical industry was developed base on constructed field remediation technology screening system. According to the screened particular pollutants, soil clean-up level and the requests of customer, the optimal remediation plan was obtained through the indoor simulation experiments and in-situ adjustment. The results showed that the research object was Cd-benzo [a] pyrene compound pollution sites, and ex-situ chemical washing was the best choice through the Topsis screening method. Multifactor experiment was designed by principle of Box-Behnken combined with the response surface method. Base on the obtained optimal testing conditions, the contaminated soil in typical chemical industry were remediated under following conditions.. 0.6 mol/L citric acid and 20 g/L β-cyclodextrin, pH = 3.0,3.4 h of leaching time, 35.00 ~C, liq- uid-to-solid ratio of 6.00 mL/g,4 times for leaching under 320.00 r/min of stirring intensity. After remediation,the removal capacities of Cd and benzo [a] pyrene were 69.88,39.20 mg/kg with the removal efficiencies were 80.14 % and 70.50% respectively,which could meet the expected targets.

关 键 词：污染场地 修复方案 筛选体系 室内模拟实验 

分 类 号：X53[环境科学与工程—环境工程]