炭铁材料修复三氯乙烯污染地下水的性能

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摘要采用生物炭（BC）为载体的纳米零价铁复合材料作为可渗透反应墙系统（PRB）中的反应介质，通过柱实验和渗透实验，研究了生物炭负载纳米零价铁（BC-nZVI）对三氯乙烯（TCE）的去除效果和炭铁复合材料在长期水流作用下的渗透性能.结果表明：炭铁复合材料对TCE的去除率在2h内可达到90%以上，10h时接近100%，随着炭铁复合材料的消耗，去除率逐渐降低，但在24h内仍能保持显著的修复效果，去除率保持在90%以上，72h后降为73.96%.PRB系统中反应介质材料在长期水流作用下出现明显的迁移，炭铁复合材料的稳定性随着炭铁比的减小而降低.5BC-1nZVI材料在持续3d的渗流作用下，其迁移流失率最低，相比纯BC材料的迁移流失情况具有明显的改善效果.微观结果表明球磨法可成功合成炭铁复合材料，合成后的nZVI颗粒存在一定程度的氧化，与TCE接触反应后的炭铁复合材料由于降解产物的附着，炭铁复合材料的表面会形成一层白色薄膜，孔径变小，进而炭铁复合材料对TCE的去除性能降低.

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	严芳敏
	郭明帅
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关键词 ：生物炭/纳米零价铁, 三氯乙烯, 可渗透反应墙, 地下水

Abstract：The column test and permeability test were carried out to explore the biochar/nZVI composite removal effect on trichloroethylene and the permeability of the BC-nZVI composite. The results show biochar/nZVI composite for TCE removal rate can reach more than 90% in 2h, close to 100% at 10h. The removal rate gradually declined with the consumption of Biochar/nZVI composite; however, it maintained a noticeable remediation effect within 24hours, and the removal rate remained at over 90% but decreased to 73.96% after 72h. In the PRB system, the reaction medium material migrates under the long-term water flow, and the stability of the BC-nZVI composite decreases with the decrease in the iron ratio. Compared with pure BC material, the migration and loss of 5BC-1nZVI material were relatively low under continuous 3-day seepage. The microscopic results show that the BC-nZVI composite can be successfully synthesized by the ball milling method, and it was found that after ball milling, nZVI particles have a certain degree of oxidation. Due to the adhesion of degradation products by the reaction of BC-nZVI composites with TCE, a white film will be formed on the surface of the carbon-iron material, and the pore size decreases; hence, the removal efficiency of BC-nZVI composites for TCE decreases.

Key words： BC/nZVI TCE permeable reactive barrier groundwater

收稿日期: 2023-06-25

PACS:

X523

基金资助:国家自然科学基金资助项目（51978157）

通讯作者: 王菲,教授,feiwang@seu.edu.cn E-mail: feiwang@seu.edu.cn

作者简介: 严芳敏(1998-),女,湖北随州人,东南大学博士研究生,从事污染土壤和地下水的可持续修复技术研究.230218908@seu.edu.cn.

引用本文:

严芳敏, 郭明帅, 王菲. 炭铁材料修复三氯乙烯污染地下水的性能[J]. 中国环境科学, 2024, 44(2): 825-831. YAN Fang-min, GUO Ming-shuai, WANG Fei. The performance of biochar/nZVI composite in remediating trichloroethylene contaminated groundwater. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 825-831.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I2/825

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