溶解有机碳来源对 perfluoroalkyl 物质的影响 从雨水中去除,使用活性碳和离子交换树脂
Chandler A Brown1, Jenna T Swenson2, Yeo-Myoung Cho1
1Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States.
Environmental science & technology
|December 19, 2025
概括
城市雨水捕获可以增加供水量,但清除基物质 (PFAS) 是至关重要的. 这项研究表明,活性炭和离子交换树脂的组合有效地从雨水中去除PFAS,即使存在溶解的有机碳.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 可持续的水资源管理
背景情况:
- 城市雨水排放中含有有害污染物,如 perfluoroalkyl 物质 (PFAS).
- 有效地去除PFAS对于安全地利用城市排水作为水源至关重要,特别是在干旱地区.
- 雨水中的草和堆肥等材料中的溶解有机碳 (DOC) 可以影响污染物清除过程.
研究的目的:
- 为了评估六种PFAS在合成雨水中的活性炭 (AC) 和离子交换树脂 (IX) 的去除效率.
- 评估来自草和堆肥的溶解有机碳 (DOC) 对AC和IX性能和寿命的影响.
- 使用1D粒子内孔扩散模型对PFAS去除进行建模,以预测在各种条件下的性能.
主要方法:
- 专研究使用合成雨水进行,其中添加了六种PFAS,并含有来自草和堆肥的DOC.
- 活性炭 (AC) 和离子交换树脂 (IX) 被单独和同时测试.
- 分析了PFAS突破数据,使用1D粒子内孔扩散模型来预测去除效率和吸附剂寿命.
主要成果:
- 与非生物降解堆肥DOC相比,可生物降解草DOC显著阻碍了PFAS的去除,这表明了动力限制.
- 对AC和IX的组合表明,在PFAS去除方面,相对于单个吸附剂的使用,增加了改进.
- 模拟的参数显示了在复制测试中对PFAS突破的一致预测.
结论:
- 结合AC和IX系统为从城市雨水中长期清除PFAS提供了强大的解决方案.
- 优化的AC和IX配置可以提供延长的水处理,估计在特定条件下大约10年或90,000个空床体积 (3mg/L堆肥DOC,80cm/h面速).
- 了解DOC类型的影响对于设计有效的雨水处理系统至关重要.
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