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首页> 外文期刊>American Water Works Association Journal >CrVI Removal by Ion Exchange and How to Handle Challenging Residuals: CVWD's Experience
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CrVI Removal by Ion Exchange and How to Handle Challenging Residuals: CVWD's Experience

机译：离子交换去除CrVI以及如何处理具有挑战性的残留物：CVWD的经验

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摘要

Hexavalent chromium (CrVI) is regulated by the US Environmental Protection Agency (USEPA) with a maximum contaminant level (MCL) of 100 ug/L for total chromium (CrVI plus trivalent chromium [CrIII]). California is the first state in the United States that established an MCL (10 μg/L) for CrVI. This presentation addresses the options for optimizing the residual wastes in ion exchange treatment systems, in particular those that use regenerable ion exchange resins. Coachella Valley Water District (CVWD) has ground-water sources with naturally occurring CrVI. To comply with the new California MCL, CVWD designed chromium treatment systems for over 20 wells. The best available technologies for CrVI include reduction/coagulation/filtration, reverse osmosis, and ion exchange (i.e., strong base anion exchange [SBA] and weak base anion exchange [WBA]). CVWD conducted pilot studies for its groundwater qualities using SBA and WBA. This presentation reports the key findings of the pilot studies, including challenges and lessons learned for SBA and WBA residuals.
机译：六价铬（CrVI）受美国环境保护局（USEPA）监管，总铬（CrVI加三价铬[CrIII]）的最大污染物水平（MCL）为100 ug / L。加利福尼亚州是美国第一个为CrVI建立MCL（10μg/ L）的州。本演讲介绍了用于优化离子交换处理系统（尤其是那些使用可再生离子交换树脂的系统）中残留废物的选项。科切拉河谷水区（CVWD）的地下水来源含有天然六价铬。为了符合新的加利福尼亚州MCL标准，CVWD为20多个井设计了铬处理系统。 CrVI的最佳可用技术包括还原/凝结/过滤，反渗透和离子交换（即强碱阴离子交换[SBA]和弱碱阴离子交换[WBA]）。 CVWD使用SBA和WBA对其地下水质量进行了试点研究。本演讲报告了试点研究的主要发现，包括SBA和WBA残差的挑战和经验教训。

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