一种新型重度铬污染土壤修复技术  

A New Technique for Remediation of Heavy Chromium-contaminated Soil

作　　者：蒋妮娜 李东[2] 李林 高然 JIANG Nina;LI Dong;LI Lin

机构地区：[1]重庆远达烟气治理特许经营有限公司科技分公司,重庆401122 [2]重庆大学环境与生态学院,重庆400044

出　　处：《科技创新与应用》2024年第13期30-34,共5页Technology Innovation and Application

摘　　要：我国退役铬化工企业的土壤铬污染严重,部分土壤六价铬浓度可高达10^(3)~10^(4)mg·kg^(-1),对植物生长、人类活动产生了不良影响。常用的铬污染土壤修复方法有还原修复技术、生物修复技术、酸淋洗-还原联合修复技术,用稀酸溶液加上还原剂将土壤中的六价铬浸出、还原。但酸溶液对难提取六价铬的溶解效果有限,且易引起土壤侵蚀等次生环境问题。碱性条件下重度铬污染土壤淋洗和还原的修复工艺能有效解决酸淋洗存在的土壤溶蚀、钙流失、含盐量大幅增加以及其他重金属浸出浓度超标等次生环境问题,且该技术通过碱淋洗还原工艺显著提高难提取六价铬的提取和还原效率,该研究形成经济可行、易于推广的铬污染土壤修复技术路线。The soil chromium pollution of retired chromium chemical enterprises in China is serious,and the hexavalent chromium concentration in some soils can be as high as 10^(3)~10^(4) mg·kg^(-1),which has a bad effect on plant growth and human activities.The commonly used remediation methods of chromium contaminated soil include reduction remediation technology,bioremediation technology,acid leaching-reduction combined remediation technology,leaching and reduction of hexavalent chromium in soil with dilute acid solution and reducing agent.However,the effect of acid solution on the dissolution of hexavalent chromium is limited,and it is easy to cause secondary environmental problems such as soil erosion.The remediation process of leaching and reduction of heavy chromium contaminated soil under alkaline condition can effectively solve the secondary environmental problems of acid leaching,such as soil dissolution,calcium loss,significant increase of salt content and excessive leaching concentration of other heavy metals,and this technology can significantly improve the extraction and reduction efficiency of difficult to extract hexavalent chromium.This study forms an economical and feasible technical route for remediation of chromium contaminated soil.

关 键 词：污染土壤 修复 重度 铬 六价铬 

分 类 号：X53[环境科学与工程—环境工程]