某废弃铬盐厂污染土壤六价铬的淋洗修复效果研究  

Research on Leaching Remediation of Hexavalent Chromic-contaminated Soil at an Abandoned Chrome Chemicals Manufacturing Site

作　　者：李素敏 赵大勇 王伟 余彬 邓博文 宋薇 Li Sumin;Zhao Dayong;Wang Wei;Yu Bin;Deng Bowen;Song Wei(Hu’nan Newworld Science and Technology Co.,Ltd.,Changsha 410006;Hu’nan Yuntian Testing Technology Co.,Ltd.,Zhuzhou 412007,China)

机构地区：[1]湖南新九方科技有限公司,湖南长沙410006 [2]湖南云天检测技术有限公司,湖南株洲412007

出　　处：《广东化工》2022年第16期112-114,共3页Guangdong Chemical Industry

摘　　要：以湖南某铬盐厂污染土壤为研究对象,测定了土壤基本理化参数及各粒径污染物的浓度,探究铬在不同粒径土壤中的分布特征,采用清水作为淋洗剂,开展水淋洗实验验证洗脱效果;采用碳酸钠、柠檬酸和盐酸作为淋洗剂,筛选较优淋洗条件。结果表明,土壤中铬的存赋形态主要为铁锰氧化结合态,平均占比56%;其次为碳酸盐结合态,平均占比约15%。水洗可有效去除粒径大于5 mm供试土壤样品中六价铬,但是对于小于5 mm粒径土壤六价铬洗脱效果有限,不能达到修复要求。碳酸钠淋洗效果较好,其次为盐酸。对于中、高浓度污染土壤,单一淋洗技术无法达到修复目标,需结合其他修复技术满足修复要求。The basic physicochemical parameters and the concentration of pollutants in each particle size were measured to investigate the distribution characteristics of chromium in different particle sizes of soil.The results shows that the chromium in the soil was mainly in the Fe-Mn oxidation-bound state,accounting for 56%on average,followed by the carbonate-bonded state,accounting for about 15%on average.Water washing can effectively remove Cr VI from soil samples with particle size larger than 5 mm,but the effect of Cr VI elution is limited for soil with particle size smaller than 5 mm,which cannot meet the remediation requirements.Sodium carbonate drenching is more effective,followed by hydrochloric acid.For medium and high concentrations of contaminated soil,a single drenching technique cannot achieve the remediation goal and needs to be combined with other remediation techniques to meet the remediation requirements.

关 键 词：铬污染土壤 六价铬 淋洗修复技术 土壤修复 

分 类 号：TQ[化学工程]