加利福尼亚州麦克法兰市建造了一座1-mgd（3.8-ML/天）的离子交换厂，用于去除井水中的硝酸盐。自1983年10月以来，该工厂一直在半自动模式下运行良好。1984年6月，工厂实现了全自动化。随着氮/升和盐水从产品水中去除，硝酸盐已降至10 mg以下。本文讨论的主题包括工厂设计、控制、规模和盐水处理；工厂运营、自动化和树脂解密； 工厂绩效；以及工厂成本。包括5个参考文献、表格、图表。

A 1-mgd (3.8-ML/day) ion exchange plant was built in McFarland, California, to remove nitrate from well water. The plant has been performing satisfactorily in the semiautomatic mode since October 1983. Full automation of the plant was completed in June 1984. Nitrate has been reduced to less than 10 mg as nitrogen/L and brine has been eliminated from the product water. Topics addressed in the article include plant design, control, size, and brine disposal; plant operation, automation, and resin declassification; plant performance; and plant costs. Includes 5 references, tables, figures.