Design considerations for biological ion exchange drinking water filters: Resin selection, backwash, and regenerations

AWWA water science Pub Date : 2023-10-05 DOI:10.1002/aws2.1356

Karl Zimmermann, William Szu-Wei Chen, Jaycee Wright, Madjid Mohseni

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Abstract

Two pilot studies provide insights into the design and operations of biological ion exchange (BIEX) drinking water filters. A lab-scale pilot with strong-base anionic (SBA) and weak-base anionic (WBA) resins demonstrated 35% and 31% removal of dissolved organic carbon (DOC) up to 30 months, until secondary ion exchange exhaustion. While the WBA resins exhibited 14% less removal of DOC, their larger capacity doubled the duration until filter exhaustion. WBA filters were less affected than their SBA counterparts by sulfate-containing inlet waters. In a second pilot, while water with high DOC yielded rapid exhaustion of SBA resins, air scouring increased the breakup of filter media and improved solids removal by 30× compared to hydraulic backwash alone. Significantly, DOC removal improved by 36% for a week following air scour. Key recommendations include the use of WBA resins to extend operating life while implementing air scouring can dramatically improve short-term DOC removal.

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生物离子交换饮用水过滤器的设计注意事项：树脂选择、反冲洗和再生

两项试点研究为生物离子交换（BIEX）饮用水过滤器的设计和操作提供了见解。实验室规模的强碱性阴离子（SBA）和弱碱性阴离子（WBA）树脂中试表明，溶解有机碳（DOC）的去除率分别为35%和31%，最高可达30 几个月，直到二次离子交换耗尽。虽然WBA树脂对DOC的去除率降低了14%，但其较大的容量使过滤器耗尽前的持续时间增加了一倍。与SBA过滤器相比，WBA过滤器受到含硫酸盐进水的影响较小。在第二个试验中，当具有高DOC的水导致SBA树脂快速耗尽时，与单独的水力反洗相比，空气冲刷增加了过滤介质的破碎，并将固体去除率提高了30倍。值得注意的是，在空气冲刷后的一周内，DOC的去除率提高了36%。主要建议包括使用WBA树脂延长使用寿命，同时实施空气冲刷可以显著提高短期DOC去除率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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AWWA water science

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4.40

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