除铁除锰工艺在水处理行业有着悠久的使用历史。由于砷与铁的亲和力，这些工艺还具有去除天然砷的优点。砷会吸附在沉淀的铁上，并在过滤步骤中去除铁时被去除。砷在铁上的吸附对许多水质问题和操作程序非常敏感。正如预期的那样，这些现有工厂的设计和运行旨在实现最佳的铁和锰去除，而不是砷去除。然而，可以进行操作上的改变，以提高砷的去除率，而不牺牲它们去除铁和锰的性能。这些变化可能足以使工厂遵守新的砷法规，而无需付出重大努力或成本。每种情况都可能不同，需要在进行全面系统更改之前进行调查。 如果操作上的改变不能产生所需的结果，可能需要更昂贵的附加治疗或其他解决方案。包括15个参考文献、表格和图表。

Iron and manganese removal processes have a long history of use by the water treatment industry. These processes also have the advantage of removing naturally occurring arsenic because of the affinity of arsenic for iron. Arsenic will sorb onto the precipitated iron and be removed as the iron is removed during the filtration step. The sorption of arsenic onto iron is sensitive to a number of water quality issues and operational procedures. As would be expected, these existing plants have been designed and are operated for optimum iron and manganese removal and not arsenic removal. Operational changes can be made, however, to increase arsenic removals without sacrificing their performance for iron and manganese removal. Such changes may be adequate to bring the plant into compliance with the new arsenic regulation without a major effort or cost. Each situation will likely be different and would need to be investigated before making a full scale system change. If operational changes do not produce the needed results, more costly add-on treatments or other solutions could be necessary. Includes 15 references, tables, figures.