碳循环+低位淋洗高位抽提技术处理重金属  

Treatment of Heavy Metals by Carbon Cycle + Low-level Leaching and High-level Extraction Technology

作　　者：张飞天 王淳 那平[1] ZHANG Fei-tian;WANG Chun;NA Ping(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《当代化工》2022年第6期1332-1335,共4页Contemporary Chemical Industry

基　　金：国家重点研发计划,黄淮海粮食主产区面源和重金属污染综合防治技术集成与示范(项目编号:SQ2018YFD080064)。

摘　　要：为解决现有淋洗技术中存在的资源浪费以及重金属迁移滞留等问题,发挥淋洗剂对碳酸盐结合态金属去除率较高的优点,利用充填CO_(2)改变金属形态并分析机理,确定最佳充入条件为CO_(2)与土壤质量比为1∶50,保持2 h后碳酸盐结合态金属增加程度最高,可最大程度提高常用淋洗剂的金属去除率,即Cu、Zn、Cd、Pb的去除率增加2.37%、3.00%、1.33%、5.23%;搭配低位淋洗-高位抽提技术,建立重金属纵向迁移模型,确定此技术可预防地下水污染;以碳循环为线索构建了物质全利用处理流程,循环利用淋洗剂与CO_(2),确定此方法有可实施性并可节约资源,即全方面展现了一种新型的有良好发展前景的土壤重金属处理方法。In order to solve the problems of waste of resources and migration and retention of heavy metals in the existing leaching technology, and give full play to the advantages of leaching agents for removal of carbonate-bound metals, the best filling conditions were determined as follows: the mass ratio of CO_(2)to soil was 1∶50, and the maximum increase of carbonate-bound metals was achieved after 2 h, which could maximize the metal removal rate of common leaching agent, namely, the removal rates of Cu, Zn, Cd and Pb were increased by 2.37%, 3.00%, 1.33% and 5.23%. Combined with low-level leaching-high-level extraction technology, the vertical migration model of heavy metals was established, and it was determined that this technology could prevent groundwater pollution. Taking the carbon cycle as a clue, the process of material full utilization was constructed, and the eluent and CO_(2)were recycled,which confirmed that this method was feasible and could save resources. That is to say, it shows a new type of soil heavy metal treatment method with good development prospect in all aspects.

关 键 词：重金属形态 淋洗 二氧化碳 地下水污染 碳循环 

分 类 号：X53[环境科学与工程—环境工程]