多年来，弗吉尼亚州切萨皮克市一直为客户提供可靠、安全的饮用水。尽管有机物含量极高，且季节性氯化物暴发，但该市一直在提供这种饮用水。因此，10 mgd的西北河水处理厂接收的水通常很难处理。在本阶段，所有卤代酸（PPLT）和卤代酸（PPLT）的反渗透处理（PPLT）均需达到80倍（PPLT）的标准。 因此，为了帮助遵守这些法规，以及减少污泥产生和总体处理成本，该市评估了Orica Watercare开发的磁性离子交换树脂（MIEX）。因此，进行了一项中试研究，以评估MIEX树脂与混凝剂组合的选择性DBP前体去除能力。MIEX（R）是一种连续离子交换工艺，旨在通过去除传统水处理工艺难以去除的TOC部分，达到较低的THM和HAA标准。 试验得出的主要结论如下:与西北河水处理厂（平均63%）相比，MIEX（R）树脂混凝后的TOC去除率（平均80%）显著提高；MIEX（R）预处理可显著降低处理水THM和HAA的生成电位；MIEX（R）预处理允许明矾剂量减少75%以上，以满足工厂TOC去除性能，同时将污泥产量减少75%以上；而且，MIEX预处理后的下游处理成本节约将为0美元。 每公斤10磅。这些节省包括新MIEX处理系统资本改进的债务偿还。包括参考资料、表格、图表。

The City of Chesapeake, Virginia has provided a reliable and safe drinking water to its customers for many years. The City has been providing this drinking water despite a water supply that is extremely high in organics with seasonal outbreaks of chlorides. As a result, the 10-mgd Northwest River Water Treatment Plant receives water that is frequently difficult to treat. This water requires very high coagulant dosages during all times of the year and seasonal reverse osmosis treatment to meet the EPA Stage 1 Disinfection Byproduct (DBP) standard for trihalomethanes (THM) of < 80 ppb and haloacetic acids (HAA) of < 60 ppb. Therefore, to help comply with these regulations as well as reduce sludge generation and overall treatment costs, the City evaluated the magnetic ion exchange resin (MIEX) developed by Orica Watercare. Accordingly, a pilot study was conducted to evaluate the selective DBP precursor removal capability of the MIEX resin in combination with a coagulant. MIEX(R) is a continuous ion exchange process designed to achieve lower THM and HAA standards by removing the TOC fraction that is difficult to remove by conventional water treatment processes. The major conclusions from the trial were as follows: the MIEX(R) resin followed by coagulation provided significantly greater TOC removal (average 80%) compared to the Northwest River WTP (average 63%); significant reductions in the treated water THM and HAA formation potentials can be achieved with MIEX(R) pretreatment; MIEX(R) pretreatment allowed a greater than 75% reduction in the alum dose to meet the plant TOC removal performance, also reducing sludge production by over 75%; and, the resulting downstream savings in treatment costs after MIEX pretreatment will be $0.10/kgal. This savings includes debt service on the capital improvements for the new MIEX treatment system. Includes reference, tables, figures.