这张幻灯片概述了一项关于使用氧化法去除砷的研究 氧化混凝循环- 过滤包括: 液态钠氧化砷 次氯酸盐或固体次氯酸钙 平板； 铁混凝剂对砷的混凝作用 根据原水特性选择； 10-30%流量的再循环；和 使用标准混合砂、砾石、， 和介质过滤器中的石榴石。概述了验证该过程的两个案例研究，包括: 在密歇根州切尔西的ETV研究 二氧化硅和铁污染；还有一个 美国亚利桑那州西南部的植物试验 高pH水和 二氧化硅和硫酸盐会造成污染。ETV验证的结果摘要 研究内容包括: NSF执行的所有操作； NSF实验室分析的所有样品； 滤液水平均3 ppb； 该系统易于操作和维护 几乎不需要维护； 估计检查系统的时间很短；和 可编程逻辑控制器（PLC）的设置使主要参数 未经现场视察就受到监控。亚利桑那州研究的结果摘要包括: 系统监控设备运行良好； 单元设计保守，可以处理 流量增加； 为期30天的试验 2.6微克/升；和 这一过程能够将砷去除到最低限度 低于8微克/升，含铁量为。48 ppm。包括表格、数字。

This slide presentation outlines a study on arsenic removal using a process of Oxidation-Coagulation-Recirculation- Filtration that includes: oxidation of arsenic with liquid sodium hypochlorite or solid calcium hypochlorite tablets; coagulation of arsenic with iron coagulant selected for raw water characteristics; recirculation of 10-30% of flow; and, filtration, using a standard mix of sand, gravel, and garnet in a media filter. Two case studies verifying the process are outlined and include: ETV Study in Chelsea, Michigan of silica and iron contaminates; and, a plant trial in southwest Arizona of high pH water and silica and sulfate contaminates. A summary of results verified by the ETV study include: all operations performed by NSF; all samples analyzed by NSF laboratory; filtrate water averaged 3 ppb; system found easy to operate and required little maintenance; estimated time to check system is minimal; and, PLC set up so main parameters can be monitored without a site visit. A summary of results for the Arizona study include: system monitoring equipment works well; unit design is conservative and can handle increases in flow; for a 30 day trial effluent arsenic averaged 2.6 ug/l; and, process was able to remove arsenic to below 8 ug/l with an iron dose of.48 ppm. Includes tables, figures.