THM Reduction Feasibility Study for the Water Treatment Plant at the Town of Rainy River- Ion Exchange Process with Regeneration

在马尼托巴省，近70%的饮用水处理厂超过了潜在致癌物质的标准 氯消毒副产品--三卤甲烷(THMS)。当氯与氯气反应时，就会形成三氢甲烷 水中溶解有机碳(DOC)，因此，水中DOC的质量和数量会对DOC有多大影响 形成了THM。THMS水平升高是(安大略省)Rainy River镇的一个主要问题。这个 Rainy River的自来水处理厂记录的配水系统中THMS水平升高往往超过 100ppb，2010年7月的最大读数为233.3 ppb。加拿大目前的饮酒指南 水质(GCDWQ)的THM规定为100 ppb，预计在2010年将降至80 ppb。 在不久的将来，继美国环保局(USEPA)之后。 DOC通常通过化学混凝去除，但该过程的效率相当低。在这 我们的目标是研究使用离子交换技术从Rainy河中去除DOC。 这是一项相对较新的技术，目前还没有出版物描述这项技术在 具有极高DOC的地表水，是加拿大大草原和盾牌的典型。两个负离子 交换树脂将进行测试；这两种树脂都是可用于去除 水中的有机酸性离子。实验室试验条件下生产的处理水最低 氯气消毒副产物(三氯甲烷)的浓度将被推荐给KGS进行进一步测试 试点规模研究。 这项研究将研究在现有水中改善水DOC去除的可能方法 Rainy River镇的处理过程。这项研究将为KGS提供优化 现有水厂的运营，并允许避免昂贵的工厂升级，这将提供 为社区节省了大量资金。许多社区提供高DOC水，在 加拿大草原和盾牌，将从这项研究中受益。

In Manitoba, nearly 70% of potable water treatment plants exceed the standard for the potentially carcinogenic chlorine disinfection by-products - trihalomethanes (THMs). THMs are formed when chlorine reacts with water Dissolved Organic Carbon (DOC), therefore, quality and quantity of water DOC will affect how much THMs are formed. Elevated level of THMs is a major concern for the Town of Rainy River (Ontario). The water treatment plant in Rainy River recorded elevated THMs levels in the distribution system often exceed 100 ppb with a maximum reading of 233.3 ppb in July 2010. The current Guideline for Canadian Drinking Water Quality (GCDWQ) has a THM regulation of 100 ppb which is expected to be lowered to 80 ppb in the near future following the United States Environmental Protection Agency (USEPA). DOC is typically removed by chemical coagulation, but, the efficiency of this process is quite low. In this project we aim to investigate the removal of DOC from the Rainy River using an Ion Exchange Technology. This is a relatively new technology and there are no publications describing effectiveness of this technology on the surface waters with extremely high DOC typical for the Canadian Prairie and the Shield. Two anion exchange resins will be tested; both resins are strong base anion exchange resins that can be used to remove organic acidic ions from water. The laboratory test conditions producing treated water with the lowest concentration of chlorine disinfection by-products (THMs) will be recommended to KGS for further testing in the pilot scale studies. This research will study the possible methods for improvement of removal of water DOC at the existing water treatment process at the Town of Rainy river. This study will provide KGS with the strategies to optimize the operations of the existing water plants, and allow for avoidance of costly plant upgrades which provide significant savings to the community. Many communities supplied with high DOC waters, common in the Canadian Prairies and the Shield, will benefit from this study.