生物除铁过程利用自然产生的细菌来催化铁的氧化 溶解的铁。化学氧化剂，如氯或高锰酸钾 传统上用于传统的除铁工艺，被淘汰。报告的优势 与传统的化学氧化过程相比，生物过程包括 减少化学物质的使用，提高过滤速度，以及有效处理污染源水的能力 含高浓度铁（大于6毫克/升[mg/L]）。 俄勒冈州佛罗伦萨市选择了生物除铁工艺进行扩建 现有的水处理厂设施。这座城市目前实行常规化学疗法 氧化，将其水源水中的溶解铁水平从约7 mg/L降低至最低水平以下 二级最大污染物水平为0.3 mg/L。 在选择生物除铁工艺作为首选处理方法之前 该市对该流程进行了为期五个月的试点研究，以评估其可行性、性能和可行性 经济学在试点研究期间特别感兴趣的参数包括除铁 处理水的效率、过滤率、细菌水质和工艺稳定性。 进行测试时，过滤速率为每平方米每分钟约3加仑 英尺（gpm/sf）至12 gpm/sf，溶解氧水平保持在1 mg/L 结果表明，该工艺稳定，能够实现大于 在所有测试的过滤速度下，铁的去除率为95%。对细菌学无不良影响 人们注意到了水的质量。对这一过程的经济评估表明 生物工艺的资本成本高于常规化学氧化， 由于减少了化学品的使用，可以实现长期节约。 包括2个参考文献、表格和图表。

The biological iron removal process uses naturally occurring bacteria to catalyze the oxidation of dissolved iron. Chemical oxidants, such as chlorine or potassium permanganate that are traditionally used in conventional iron removal processes, are eliminated. Reported advantages of the biological process when compared with conventional chemical oxidation processes include reduced chemical use, higher filtration rates, and the ability to efficiently treat source waters that contain high concentrations of iron (greater than 6 milligrams per liter [mg/L]). The City of Florence (City), Oregon, has chosen the biological iron removal process for expansion of its existing water treatment plant facility. The City currently practices conventional chemical oxidation to reduce dissolved iron levels in its source water from about 7 mg/L to below the secondary maximum contaminant level of 0.3 mg/L. Prior to selecting the biological iron removal process as its preferred treatment approach, the City conducted a five-month pilot study of the process to assess its feasibility, performance and economics. Parameters of particular interest during the pilot study included iron removal efficiency, filtration rates, bacteriological water quality of the treated water, and process stability. Testing was conducted with filtration rates ranging from about 3 gallons per minute per square foot (gpm/sf) to 12 gpm/sf with dissolved oxygen levels being maintained at levels from 1 mg/L to about 7 mg/L. Results showed the process to be stable and capable of achieving greater than 95 percent iron removal at all filtration rates tested. No adverse effects on the bacteriological quality of the water were noted. An economic evaluation of the process showed that while capital costs of the biological process are greater than those of conventional chemical oxidation, long term savings would be realized because of reduced chemical use. Includes 2 references, tables, figures.