1994年8月15日至12月23日，在东部城市水区的支持下，在加利福尼亚州欧文市布莱克和维奇的指导下，使用美国过滤器/朝日EDA电渗析试验装置，进行了一项试点试验计划。Menifee是加利福尼亚州圣哈辛托（San Jacinto，California）地区的一个快速发展的住宅社区，该地区是洛杉矶东部的郊区，正在考虑新的供水水源。不断减少的天然水源和其他社区的竞争需求除了考虑地下水之外别无选择。然而，该地区的地下水中TDS和二氧化硅含量较高，远远超过了SDWA的饮用水限值。因此，治疗被认为是必要的。该地区的地下水中石膏和硫酸盐含量也很高，因此将反渗透（RO）的回收率限制在70%左右。 使情况恶化的是，必须以过高的资本和运营费用溢价将浓缩物处理到30英里以上的成本。在这种情况下，电渗析（EDA）通过使用硫酸盐选择性膜提供了显著的优点。这些膜抑制硫酸盐通过，并允许实现更高的回收率。本试验研究确定了三种工艺，即反渗透（RO）、电渗析反渗透（EDR）和EDA。本文讨论了这些试验运行的EDA阶段。

A pilot testing program was conducted under the auspices of the Eastern Municipal Water District and the direction of Black and Veatch, Irvine, California from August 15 to December 23, 1994, using a US Filter/Asahi EDA Electrodialysis pilot unit. Menifee is a rapidly growing residential community in the San Jacinto, California area, a suburb East of Los Angeles, where a new water supply source is under consideration. Dwindling alternate natural water supplies and competing demands from other communities left no choice but to consider groundwater. However, groundwater in the area is high in TDS, and silica, and far exceeds the SDWA limits for drinking water. Treatment is therefore deemed necessary. Underground water in the region is also high in gypsum and sulfates thus limiting the recovery of reverse osmosis (RO) to about 70%. Exacerbating the situation is the cost of concentrate disposal that must be pumped over 30 miles at excessive premiums in capital and operating charges. Electrodialysis (EDA) offers significant merits in this context through its use of sulfate selective membranes. These membranes inhibit sulfate passage and allow higher recoveries to be achieved. Three processes were identified for this pilot study namely, reverse osmosis (RO), electrodialysis reversal (EDR) and EDA. This paper discusses the EDA phase of these pilot runs.