FeCl_3对Cd污染农田土壤的淋洗试验研究  

Leaching Experimental Design of Cd Removal by FeCl_3 in the Cd-contaminated Cultivated Soil

作　　者：农泽喜[1] 覃朝科[1] 卢宗柳[1] 唐文杰[1] 刘静静[1] 

机构地区：[1]中国有色桂林矿产地质研究院有限公司广西环境治理工程技术研究中心环境工程与保护评价重点实验室,桂林541004

出　　处：《科学技术与工程》2017年第6期317-321,共5页Science Technology and Engineering

基　　金："广西特聘专家"专项经费;桂林市科学研究与技术开发计划项目(20130104-5);广西科技重大专项(桂科重1598014-3)资助

摘　　要：以FeCl_3为淋洗剂对Cd污染农田土壤开展淋洗试验研究研究了淋洗液浓度、淋洗时间、液固比、搅拌速率对重金属去除效果的影响并分析土壤淋洗前后Cd的赋存形态变化。结果表明:广西某Cd污染农田土壤中Cd的赋存形态以可交换态和有机结合态为主,两者占总Cd比例为69.71%;当FeCl_3浓度、淋洗时间、液固比、搅拌速率分别为0.1 mol/L、60 min、5:1、150~180 r/min时为最佳因素组合,对Cd的去除率可达到77.27%;经过淋洗修复后土壤中Cd的赋存形态以不可生物利用性的有机结合态和残渣态为主两者占总Cd比例达到83.67%,可初歩认为以FeCl_3,为淋洗剂的Cd污染农田土壤修复方法具有可行性。Soil leaching experiment in laboratory using FeCl3 was conducted to study the leaching agent concentration, leaching time, liquid-solid ratio and stirring ratio.And the status of Cd in the contaminated soil were determined before and after leaching.Results showed that Cd was dominated by exchangeable status and organis status on the ratio of 69.71% in the total Cd.The optimum conditions for Cd were FeCl3 concentration of 0.1 mol/L, leaching time of 60 min, liquid-solid ratio of 5∶1 and stirring ratio of 150-180 r/min.It was made the removal rates of Cd reach 77.27%.After leaching, Cd was mainly in non-bioavailable status with organic status and residual status on the ratio of 83.67% in the total Cd.The preliminary view was that the leaching method using FeCl3 for Cd-contaminated cultivated soil was feasible.

关 键 词：FECL3 淋洗 Cd污染农田土壤 形态分析 

分 类 号：X53[环境科学与工程—环境工程]