某铅锌冶炼污染场地基于多源信息的重金属稳定化修复及其评价
The field-scale stabilization remediation and assessment of potential toxic elements based on the multi-source information from a Chinese Pb/Zn smelter contaminated site
郭小品 1李业勋 2左小永 3徐业勤 3苗进辉 3张恒勇 3姚佳斌 1徐则林 1付融冰1
作者信息
- 1. State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China
- 2. CCCC Third Harbor Engineering Co.,Ltd.,Shanghai 200030,China
- 3. No.8 Engineering Co.,Ltd.of CCCC Third Harbor Engineering Co.,Ltd.,Zhuzhou 412000,China
- 折叠
摘要
冶炼污染场地土壤中多重金属复合污染的特征增大了对土壤的修复和最终利用的难度.本研究深入调查了某铅锌冶炼场地土壤重金属污染特征,针对性地制定多种联合稳定化修复方案,采用高精度混合装备添加药剂,实施稳定化修复工程.结果表明,Cd、Pb、Zn和As是场地土壤中最主要的重金属污染物,其中Cd、Pb、As的超标率分别为75.80%、76.43%、88.54%.重金属的分布模式与土壤理化性质、污染物迁移路径、水文地质条件、地层岩性、冶炼工艺、厂区功能布局等密切相关.土壤重金属污染主要来源于冶炼粉尘、废渣和废水排放等冶炼活动.稳定化工程效果显示,在药剂与土壤混匀程度不低于90%时,采用无机混合药剂与TJ400螯合剂的组合方案,对土壤稳定化处理7 d后,土壤中Cd、Pb和As同步稳定化效果最好.本研究结果可对多金属重污染场地土壤的稳定化修复提供实践指导.
Abstract
Potential toxic elements(PTEs)generally co-existing in soils make a great challenge to the sustainable development and utilization of smelter contaminated sites.This study delved into the pollution characteristics of PTEs and conducted the field-scale remediation of PTEs stabilization.The results indicated that Cd,Pb,Zn,and As were identified as the main PTEs pollutants in soils with exceedance rates of 75.80%for Cd,76.43%for Pb and 88.54%for As,respectively.The distribution patterns of PTEs were closely associated with soil physicochemical properties,pollutant transport routes,hydrogeological conditions,formation lithology,smelting process and smelting workshop distribution.Soil PTEs mainly originated from smelting activities,such as the emissions of smelting wastewater,flue gas and slags.In addition,a combination of mixture agents and chelating agent(TJ400)showed excellent performance for the synchronous stabilization of Cd,Pb and As within 7 d,and the mixing degree between stabilization agents and contaminated soils was over 90%.The present results would offer practical guidance in developing a suitable remediation scheme based on a comprehensive investigation of the pollution characteristics of PTEs in soils.
关键词
铅锌冶炼场地/多金属污染土壤/多源信息/稳定化药剂/稳定化工程Key words
Pb/Zn smelter site/multi-metal contaminated soils/multi-source information/stabilization agent/stabilization engineering引用本文复制引用
基金项目
国家重点研发计划(2023YFC3707704)
国家重点研发计划(2019YFC1805205)
出版年
2024
NETL
NSTL
万方数据