爱荷华州华盛顿市有三口市政水井，平均每年产量约为3.5亿加仑。1993年之前，每个井场都添加磷酸盐，以控制水管中的铁。然后，井水在工厂汇合，注入氯气和烧碱，然后储存在地下蓄水池中。为了应对饮用水镭标准的违反，并试图改善整体水质，该市评估了几种处理方案。电渗析逆转（ER）最终被选为最佳治疗方案。本文讨论了该市于1993年4月建成的新ER水处理厂的设计和运行情况。

The City of Washington, Iowa, has three municipal wells that produce an average of about 350 million gallons per year. Prior to 1993, phosphate was added at each well site to control iron in the water mains. Water from the wells then converged at the plant and was injected with chlorine and caustic soda before storage in a ground reservoir. In response to a drinking water standard violation for radium and in an attempt to improve overall water quality, the City evaluated several treatment alternatives. Electrodialysis reversal (ER) was finally selected as the best treatment option. This paper discusses the design and operation of the city's new ER water treatment plant which was completed in April 1993.