通过一次性和可再生的离子交换树脂去除传统的 perfluoroalkyl 酸和新出现的 per-和 polyfluoroalkyl 乙烯酸: 快速小规模的柱体测试和模型匹配
Bingchuan Liu1, Yen-Ling Liu1, Mei Sun1
1Department of Civil and Environmental Engineering, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA.
Water research
|April 27, 2024
概括
一种PFAS选择性树脂有效地去除了饮用水中的新出现的污染物,显示出高容量和最小的突破. 然而,再生被证明是无效的,树脂可能会随着时间的推移成为PFAS来源.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 吸附科学 吸附科学
背景情况:
- 和多基基物质 (PFAS) 是饮用水中令人担忧的持续性环境污染物.
- 离子交换是消除PFAS的潜在技术,但树脂性能有很大差异.
研究的目的:
- 评估PFAS选择性离子交换树脂 (AER1) 和通用离子交换树脂 (AER2) 的性能,以从饮用水中去除各种PFAS.
- 使用博哈特-亚当斯模型建模PFAS突破,并评估树脂再生功效.
主要方法:
- 使用AER1和AER2进行了小规模快速列测试 (RSSCT),以评估PFAS去除.
- 波哈特-亚当斯模型用于预测和分析突破曲线.
- 使用10%的NaCl溶液进行了再生试验.
主要成果:
- AER1表现出高的PFAS吸收能力,在测试的21种PFAS中,有11种符合饮用水法规的PFAS没有突破.
- AER2显示了快速突破,表明它不适合饮用水处理.
- PFAS占据了树脂容量的很小一部分 (<0.01%);线性异构体和更大的分子体积的PFAS表现出较晚的突破和更高的吸收.
- 再生从AER2部分释放PFAS,但不是AER1,再生树脂显示出更快的突破,表明不适合重复使用.
结论:
- PFAS选择性离子交换树脂 (AER1) 显示出对饮用水处理的前景,因为其高容量和对一系列PFAS的有效性.
- 树脂再生在很大程度上是无效的,从原始和再生树脂中潜在的PFAS浸出引起了对长期使用的担忧.
- 需要进一步的研究来优化再生策略,并充分了解PFAS修复中离子交换树脂的长期行为.
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