砷在水中以两种氧化状态存在， 亚砷酸盐[As（III）]和砷酸盐[As（V）]。As（III）相对 可在水中移动，且难以通过 除砷处理工艺。源水 含有As（III）的必须添加强氧化剂，如 游离氯或高锰酸盐氧化砷。 本文重点介绍了俄亥俄州的一家污水处理厂 水源水中的天然细菌集中在水中 过滤和氧化As（III），消除了对 过滤前使用强氧化剂。微生物过滤 还提供了次要的好处，如减少化学反应- 处理问题，维持硝化能力 在过滤器中，消除空气中的硝化潜力 分配系统，并减少氯气需求 在成品水中。 饮用水的微生物处理并不广泛 在美国被接受。这项研究的结果 证明了As（III）氧化及其后续反应 清除可以通过微生物进行，提供了一种替代方法， As（III）氧化的非化学方法及其安全性 以及相对简单的方法来满足砷的需求 饮用水标准。包括43个参考文献、表格和图表。

Arsenic exists in two oxidation states in water, arsenite [As(III)] and arsenate [As(V)]. As(III) is relatively mobile in water and difficult to remove by arsenic-removal treatment processes. Source waters that contain As(III) must add a strong oxidant such as free chlorine or permanganate to oxidize the arsenic. This article highlights an Ohio treatment plant where natural bacteria in the source water concentrate in filters and oxidize As(III), eliminating the need for a strong oxidant ahead of filtration. Microbial filtration also provides secondary benefits such as reduced chemical- handling issues, maintenance of nitrification capacity in the filters, elimination of nitrification potential in the distribution system, and reduced chlorine demand in the finished water. Microbial treatment of drinking water is not widely accepted in the United States. Results of this research demonstrated that As(III) oxidation and its subsequent removal can occur microbially, offering an alternative, nonchemical approach to As(III) oxidation and a safe and relatively simple means of meeting the arsenic drinking water standard. Includes 43 references, tables, figures.