通过凝结和花从土壤洗水中去除和多基物质 (PFAS)
Michel Hubert1, Thomas Meyn2, Mona Cecilie Hansen3
1Norwegian Geotechnical Institute (NGI), NO-0806 Oslo, Norway; Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway.
Water research
|December 1, 2023
概括
这项研究评估了凝固剂和花剂,用于从受污染的水中去除和多基物质 (PFAS). perfluor Ad® 显示出最高的 PFAS 清除效率,强调了为土壤清洗过程水选择适当的处理化学品的重要性.
科学领域:
- 环境化学环境化学
- 水处理技术 水处理技术
- 整治科学 整治科学
背景情况:
- 土壤洗是修复受过和多基物质 (PFAS) 污染的地点的关键技术.
- 土壤冲洗产生了PFAS污染的工艺水,需要进行有效的处理.
- 对于从这种工艺水中去除PFAS的凝结和花存在有限的研究.
研究的目的:
- 评估六种不同的凝固剂和花剂在从模拟的土壤洗过程水中去除PFAS的有效性.
- 根据PFAS去除效率,链条长度和头组相互作用来比较各种化学处理的性能.
- 确定从工业废水中去除PFAS的最佳处理策略.
主要方法:
- 测试六种凝固剂/花剂:聚化 (PACl),氧化八水合物,阴离子和阴离子聚烯胺,Polyclay 685和 perfluor ad.
- 处理与水性薄膜形成泡 (AFFF) 部位典型的度上 PFAS 污染的洗水.
- 测量PFAS去除效率和度降低在恒定的pH在不同的剂量.
主要成果:
- 所有测试剂都将度降低了95%以上.
- 对于长链 (>99%) 和短链PFAS (>68%) 两种,Perfluor Ad®实现了最高的去除率.
- 除去效率根据凝固剂类型,剂量和PFAS特征 (链条长度,头部组) 有显著差异.
- 较长链PFAS的去除主要是由疏水相互作用驱动的,而较短链PFAS的去除取决于静电相互作用.
结论:
- 选择合适的凝固剂和花剂对于最大限度地从土壤洗过程水中去除PFAS至关重要.
- perfluorad®表现出卓越的性能,这表明它有可能有效地修复PFAS.
- 凝固和花可以集成到处理列车中,用于处理从土壤洗操作中污染的废水.
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