加利福尼亚州奥克兰市东湾市政公用事业区（EBMUD）的经验表明，在对耗尽的颗粒活性炭（GAC）/砂滤器进行生物过滤之前，生物过滤水中的氯胺需求量远大于嵌入和臭氧氧化水中的氯胺需求量。氯胺的过度衰变导致分配系统受影响部分的氯胺残留和硝化作用丧失。此外，在EBMUD氯胺化水中观察到卤乙酸（HAA6）的持续形成。1999年10月至2000年1月，在上圣莱安德罗水处理厂进行了中试过滤试验。试验目的是:研究生物过滤引起的氯胺降解；检查新的GAC/砂和砂岩/砂过滤器的性能，并将其与现有GAC/砂过滤器的性能进行比较，以便提出更换层的建议； 测定新型GAC/砂和无烟煤/砂过滤介质对总有机碳的去除率；测定新过滤器对HAA的去除率，并研究进一步减少氯胺化水中HAA形成的方法。包括5个参考文献、表格、图表。

Previous experience at East Bay Municipal Utility District (EBMUD) of Oakland,California, indicated much greater chloramine demand in biofiltered water than insettled and ozonated waters prior to biofiltration on exhausted granularactivated carbon (GAC)/sand filters. This excessive decay of chloramines resultedin a loss of chloramine residual and nitrification in the affected part of thedistribution system. In addition, continuing formation of haloacetic acids (HAA6)was observed in EBMUD chloraminated waters. Pilot filtration testing wasconducted at the Upper San Leandro Water Treatment Plant from October 1999through January 2000. The testing objectives were: to investigate the chloraminedecay due to biofiltration; to examine the performance of new GAC/sand andanthracite/sand filters as compared to the performance of existing GAC/sandfilters in order to make a recommendation for replacement layers; to determinethe removal of total organic carbon by the new GAC/sand and anthracite/sand filter media; and todetermine the removal of HAAs by the new filters and investigate ways of furtherminimizing HAA formation in chloraminated water. Includes 5 references, tables, figures.