多孔饱和含水介质三氯乙烯污染的微米零价铁修复实验

顾琳凯; 王明玉; 孙东越; 王亚静

doi:10.13205/j.hjgc.202208002

多孔饱和含水介质三氯乙烯污染的微米零价铁修复实验

doi: 10.13205/j.hjgc.202208002

1. 辽宁工程技术大学矿业学院, 辽宁阜新 123000;
2. 中国科学院大学资源与环境学院, 北京 100049

基金项目:

污染场地挥发类有机污染物传输机制与扩散通量(2020YFC1807102、2019YFC1806205)

详细信息

作者简介:
顾琳凯(1996-),男,在读硕士研究生,主要研究方向为水文地质与地下水污染防治。1014486421@qq.com

通讯作者:
王明玉(1961-),男,博士,教授,主要研究方向为地下水污染防治与水环境数值模拟。mwang@ucas.ac.cn

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出版历程
- 收稿日期: 2021-02-03
- 刊出日期: 2022-11-08

TCE （TRICHLOROETHENE） REMEDIATION IN SATURATED POROUS MEDIA WITH MICRON ZERO-VALENT IRON

1. College of Mining, Liaoning Technical University, Fuxin 123000, China;
2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 三氯乙烯是分布较普遍且难以降解的一类土壤与地下水污染物,零价铁作为一种氯代烃污染修复材料一直备受关注,而微米零价铁(mZVI)可否成为高效材料应用于污染修复工程,则需要进一步研究。实验构建了受三氯乙烯(TCE)污染的砂柱,考察研究mZVI目数、投加量及介质粒径对三氯乙烯去除效果的影响。结果表明:mZVI对三氯乙烯的短期去除效果明显,去除率达到99%。mZVI目数与TCE去除率呈正相关,在砂柱孔隙水TCE初始浓度为10⁵ μg/L时150 g的Fe⁰投加量能够表现很强的去除效果,同时细砂(<0.075 cm)介质要比粗砂(0.075~0.15 cm)还原去除速率高。mZVI还原修复过程引起的水环境变化主要体现在氧化还原电位平均下降170 mV,从氧化态转化至还原态。研究结果显示,mZVI在土壤与地下水污染修复中具有广阔应用前景,对土壤与地下水有机氯代烃污染治理具有借鉴价值。
- 三氯乙烯污染 /
- 地下水 /
- 微米零价铁 /
- 还原脱氯作用
Abstract: Trichloroethene is a kind of soil and groundwater pollutant, which is difficult to remediate. Zero-valent iron (ZVI) has been paid much attention for many years, and whether micron zero-valent iron can be used as a practical and efficient soil and groundwater remediation material for site pollution remediation needs further study. A sand column contaminated by trichloroethene was constructed to investigate the effects of the number of micron zero valent iron (mZVI), the dosage of mZVI and the size of the medium on the removal efficiency of trichloroethene. The experimental results showed that the removal rate of mZVI was 99%, and the short-term removal effect of trichloroethene was significant. There was a positive correlation between the number of iron and removal efficiency, and 150 g of mZVI could be used to remove the pore water of the sand column under the initial concentration of TCE of nearly 10⁵ μg/L, at the same time, the reduction removal rate of fine sand (<0.075 cm) was higher than that of coarse sand (0.075~0.15 cm). The water environment change caused by the reduction and restoration of mZVI was mainly reflected in the average decrease of 170 mV of reduction potential from oxidation state to reduction state. The results showed that the mZVI has a broad application prospect in soil and groundwater pollution remediation, and it can be used as a reference in treatment of organic chlorinated hydrocarbon pollution such as trichloroethene in soil and groundwater.
- trichloroethylene contamination /
- groundwater /
- micron zero-valent iron /
- reductive dechlorination

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