竹炭-沸石混合料可渗透反应墙修复镉污染地下水的试验

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摘要本文结合物理力学测试、静态批和动态柱试验、微观表征分析、地下水数值模拟等手段分析了竹炭-沸石混合料填充可渗透性反应墙(PRB)对镉的吸附机理和时效性.竹炭(粒径大于0.18mm)和沸石(粒径大于0.5mm)按照质量分数1:10~3:10混合时,不仅能有效去除地下水中镉,而且具备良好的渗透性和抗剪强度.竹炭-沸石混合料对镉的吸附能力随竹炭配比增加而增大,随粒径减小而增加;PRB柱穿透和耗竭时间随地下水流量和镉浓度增加而缩短.竹炭-沸石混合料去除镉的过程主要是发生络合反应、螯合作用、离子交换反应.地下水镉污染场地的PRB墙体厚度越大,地下水流速越慢,PRB的有效运行时间越长.

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	李子邦
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关键词 ：地下水, 镉污染, 可渗透反应墙, 长效性

Abstract：This paper analyzes the adsorption mechanism of the Permeable Reactive Barrier (PRB) with bamboo charcoal-zeolite mixture to cadmium, as well as its timeliness combining physico-mechanical tests, static batch tests, dynamic column experiments, microscopic characterization analysis, and groundwater flowing numerical simulation. When bamboo charcoals (particle size greater than 0.18mm) and zeolites (particle size greater than 0.5mm) were mixed in a mass fraction of 1:10 to 3:10, the bamboo charcoal-zeolite mixtures could not only remove cadmium from groundwater effectively, but also had good permeability and shear strength. The adsorption capacity of the bamboo charcoal-zeolite mixtures for cadmium increased with the growing bamboo charcoal ratio and decreasing particle size. The penetration and depletion time of the PRB column decreased with increasing groundwater flowing rate and column concentration. The removal reactions of cadmium by bamboo charcoal-zeolite mixtures mainly included complexation, chelation, and ion-exchange. At a groundwater cadmium contaminated site with a thicker PRB and slower groundwater flowing rate, the effective operation time of the PRB was longer.

Key words： groundwater cadmium contamination permeable reactive barrier sustainability

收稿日期: 2024-03-07

PACS:

X523

基金资助:国家自然科学基金(42002249,52208336)

通讯作者: 龚星,副教授,xing_g@gdut.edu.cn E-mail: xing_g@gdut.edu.cn

作者简介: 李子邦(2004-),男,江西南昌人,广东工业大学本科生,主要研究方向为地下水污染修复的研究工作.3206915809@qq.com.

引用本文:

李子邦, 张亮, 刘豪, 龚星. 竹炭-沸石混合料可渗透反应墙修复镉污染地下水的试验[J]. 中国环境科学, 2024, 44(10): 5607-5619. LI Zi-bang, ZHANG Liang, LIU Hao, GONG Xing. The experimental study of cadmium contaminated groundwater remediation by permeable reactive barrier with bamboo charcoal-zeolite mixture. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5607-5619.

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