复配还原稳定化药剂修复铬污染土壤研究  

Study on the Remediation of Chromium Contaminated Soil by Compound Reduction and Stabilization Agents

作　　者：和利钊 顾静 李琼 杨国航 牛婧 张海欧 郑子健 赵振 HE Li-zhao;GU Jing;LI Qiong(Guangxi Bossco Environmental Protection Technology Co.,Ltd.,Nanning,Guangxi 530007;Beijing Bossco Environmental Protection Technology Co.,Ltd.,Beijing 100000)

机构地区：[1]广西博世科环保科技股份有限公司,广西南宁530007 [2]北京博世科环保科技有限公司,北京100000

出　　处：《安徽农业科学》2022年第5期43-47,共5页Journal of Anhui Agricultural Sciences

基　　金：国家重点研发计划(2020YFC1808500);广西重点研发计划(桂科AB18281002)。

摘　　要：以甘肃省某化工厂历史遗留铬污染场地为研究对象,开展还原稳定化法修复铬污染土壤小试研究,确定最佳修复工艺参数。结果表明,采用9种不同配比的复配修复药剂分别对铬污染土壤进行处理,添加后养护3 d,综合对比浸出液中的污染物浓度、还原稳定效率和反应前后土壤pH变化,得出6%硫酸亚铁+3%硫化钠和6%氯化亚铁+3%硫化钠的修复效果较好。添加8%氯化亚铁+4%硫化钠,养护3 d,可使污染土浸出液中的总铬和Cr^(6+)达到修复目标值,养护30 d,可使还原稳定效率达到100%。添加不同百分比的硫酸亚铁+硫化钠和氯化亚铁+硫化钠,对场地污染土壤pH影响不大;添加不同百分比的硫酸亚铁+硫化钠和氯化亚铁+硫化钠,养护3 d和养护30 d,对场地污染土壤pH影响不大。Taking the historical chromium-contaminated site of a chemical plant in Gansu Province as the research object,a pilot study on the restoration of chromium-contaminated soil by reduction and stabilization was carried out to determine the best remediation process parameters.The results showed that 9 kinds of compound remediation agents with different proportions were used to treat the chromium-contaminated soil,three days after addition,the contaminant concentration in the leachate,the reduction stabilization efficiency and the soil pH change before and after the reaction were comprehensively compared,6%ferrous sulfate+3%sodium sulfide and 6%ferrous chloride+3%sodium sulfide had the better remediation effects.Adding 8%ferrous chloride+4%sodium sulfide for 3 days,the total chromium and hexavalent chromium in the leachate of contaminated soil could reach the target value of remediation.For 30 days,the reduction stability efficiency could reach 100%.Adding different percentages of ferrous sulfate+sodium sulfide and ferrous chloride+sodium sulfide had little effect on the pH of the contaminated soil.Adding different percentages of ferrous sulfate+sodium sulfide and ferrous chloride+sodium sulfide,maintenance for 3 days and 30 days,had little effect on the pH of contaminated soil.

关 键 词：土壤铬污染 复配还原稳定剂 添加量 养护时间 还原稳定效率 土壤PH 

分 类 号：X53[环境科学与工程—环境工程]