某典型化工污染场地土壤修复方案研究
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2020-03-10 17:01:00
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第一作者:李定龙,男,1963年生,博士,教授,研究方向为环境污染修复。#通讯作者。江苏省科技计划项目(No.BY201403721);常州市科技项目(No.KYZ14020346)。某典型化工污染场地土壤修复方案研究李定龙徐冉吕浩万玉山杨彦#(常州大学环境与安全工程学院,江苏常州213164)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。关键词污染场地修复方案筛选体系室内模拟实验DOI:10.15985/j.cnki.10013865.2015.07.018犛狋狌犱狔狅狀狋犺犲狉犲犿犲犱犻犪狋犻狅狀狆犾犪狀犳狅狉狋狔狆犻犮犪犾狆狅犾犾狌狋犻狅狀狊犻狋犲狊犮狅狀狋犪犿犻狀犪狋犲犱犫狔犮犺犲犿犻犮犪犾犲狀狋犲狉狆狉犻狊犲犔犐犇犻狀犵犾狅狀犵,犡犝犚犪狀,犔犢犝犎犪狅,犠犃犖犢狌狊犺犪狀,犢犃犖犌犢犪狀.(犛犮犺狅狅犾狅犳犈狀狏犻狉狅狀犿犲狀狋犪犾牔犛犪犳犲狋狔犈狀犵犻狀犲犲狉犻狀犵,犆犺犪狀犵狕犺狅狌犝狀犻狏犲狉狊犻狋狔,犆犺犪狀犵狕犺狅狌犑犻犪狀犵狊狌213164)犃犫狊狋狉犪犮狋:Thebestmethodfortheremediationofthecontaminatedsoilinatypicalchemicalindustrywasdevelopedbaseonconstructedfieldremediationtechnologyscreeningsystem.Accordingtothescreenedparticularpollutants,soilcleanuplevelandtherequestsofcustomer,theoptimalremediationplanwasobtainedthroughtheindoorsimulationexperimentsandinsituadjustment.TheresultsshowedthattheresearchobjectwasCdbenzo[a]pyrenecompoundpollutionsites,andexsituchemicalwashingwasthebestchoicethroughtheTopsisscreeningmethod.MultifactorexperimentwasdesignedbyprincipleofBoxBehnkencombinedwiththeresponsesurfacemethod.Baseontheobtainedoptimaltestingconditions,thecontaminatedsoilintypicalchemicalindustrywereremediatedunderfollowingconditions:0.6mol/Lcitricacidand20g/Lβcyclodextrin,pH=3.0,3.4hofleachingtime,35.00℃,liquidtosolidratioof6.00mL/g,4timesforleachingunder320.00r/minofstirringintensity.Afterremediation,theremovalcapacitiesofCdandbenzo[a]pyrenewere69.88,39.20mg/kgwiththeremovalefficiencieswere80.14%and70.50%respectively,whichcouldmeettheexpectedtargets.犓犲狔狑狅狉犱狊:contaminatedsites;remediationplan;screeningsystem;indoorsimulationexperiment近年来,随着工业化、城市化进程的不断加快,我国出现大批关闭、搬迁后的化工企业遗留污染场地,这些污染场地严重威胁着人体健康和环境安
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