生物淋滤电动修复湖泊底泥中的铬
Hybrid Technology of Bioleaching and Electrokinetics to Remediate Chromium Contaminated Sediments
刘广容 1姜华 1王松伟1
作者信息
- 1. 武汉大学动力与机械学院,湖北 武汉 430072
- 折叠
摘要
该文采用生物淋滤电动复合技术修复底泥,经生物淋滤后底泥中铬形态发生了改变,可交换离子态、碳酸盐结合态的铬含量比例明显增加,而铁锰氧化物结合态、硫化物及有机结合态以及残渣态的比例含量明显下降(可为电动修复底泥时铬的迁移提供有利条件).单纯电动修复铬的去除率为32.6％,单纯生物淋滤铬的去除率为25.1％,淋滤去除率与底泥的pH值和氧化还原电位紧密相关.经生物淋滤电动复合处理后,铬的去除总量可达53.4％.生物淋滤电动复合技术对可交换的离子态、碳酸盐结合态、硫化物及有机结合态的铬去除率较高,特别是对碳酸盐结合态的铬去除率达到61.1％.实验表明电动生物淋滤技术具有协同作用,适合湖泊底泥铬污染治理.
Abstract
Sediment pollution is quite a serious problem in the whole world.Hybrid technology of bioleaching and electroki-netics was adopted to remediate the polluted sediments.The speciation of chromium in sediments had significant changes dur-ing bioleaching remediation.The exchangeable and carbonate-bound portion were increased significantly,whereas Fe/Mn oxide-bound,organic matter/sulfide-bound or residual fraction were decreased significantly(It can provide favorable condi-tions for the migration of chromium during electrokinetics remediation).The remove rate of chromium was 32.6％by electro-kinetic remediation method.The leaching rate of chromium in sediment was 25.1％,which was closely related to pH value and redox potential of sediments.In the comparison of bioleaching-electrokinetic and electrokinetic remediation,the average removal rate of total chromium was up to 53.4％after bioleaching-electrokinetic remediation.Experiments show that the hybrid technology of bioleaching and electrokinetic remediation has synergistic effects and is suitable for chromium pollution control in sediments.
关键词
电动/生物淋滤/铬/底泥/修复Key words
electrokinetic/bioleaching/chromium/sediments/remediation引用本文复制引用
基金项目
国家自然科学基金联合基金项目(U2240206)
出版年
2024
NETL
NSTL
万方数据