2006年初，当新的砷规定中降低的最大污染物水平（MCL）生效时，许多水资源受到污染 供应商被迫采取行动，以满足新的砷规定。对于水来说也是如此 包含其他超过主要MCL或次要标准的容器，同时 遵守法规可能会付出高昂的代价。该项目的目标是确定最大的成本 从地下水中去除砷和过量氟化物的有效方法。 Coyote Springs开发区是内华达州拉斯维加斯北部的一个总体规划社区 将使用地下水井作为唯一的饮用水源。4000 gpm的水处理厂 是为开发的第一阶段设计的。两口水源井的含水量为14微克/升 砷和2.1 mg/L氟化物的含量，超过了各自的一级和二级标准 对于这两个元素。内华达州的强制性氟化物限值设定为2.0 mg/L。本文介绍了为同时符合标准而进行的中试试验的结果 砷和氟化物标准。活性氧化铝（AA）是美国环境保护局（USEPA）指定的最佳可用材料 去除砷和氟的技术（BAT）。然而，实验室规模的评估表明 虽然AA可以同时去除砷和氟，但它的床寿命相当短，尤其是对人体而言 除氟。虽然铁基吸附介质对砷的床寿命更长 与AA相比，它不能去除氟化物。因此，需要一个额外的单元过程 如果选择铁基吸附介质去除砷，则必须添加氟 移动使用相同的水和专有过滤介质在现场进行的中试试验 结果表明，三氯化铁混凝过滤可使砷降低90%以上 剂量为1 mg/L时的百分比，远低于台架试验和报告的结果 在文学方面。进行了初步试验，以确定同步辐射的最佳剂量 去除砷和氟，并调查潜在的额外砷 与专有过滤介质相关的去除机制。这些试验的结果 表明:专有介质对砷有吸附能力，会导致 如果吸附能力未达到要求，则通过混凝/过滤高估砷去除率 考虑到；同时去除砷和氟可以通过以下方法实现: 使用铁和明矾的混合物或单独使用明矾进行混凝/过滤；以及最佳剂量 除砷和除氟的水源是郊狼泉 测定为7.5 ppm明矾。包括表格、数字。

When the reduced maximum contaminant level (MCL) of the new arsenic rule went into effect in early 2006, many water purveyors were forced to take actions to meet the new arsenic rule. For water that also contains other containments exceeding the primary MCL or secondary standard, simultaneous compliance could be very costly. The objective of this project was to determine the most cost effective approach that removes arsenic and excess fluoride from groundwater. Coyote Springs Development area is a master planned community north of Las Vegas NV that will use groundwater wells as its only potable water source. A 4,000 gpm water treatment plant is designed for the first phase of the development. The two source water wells contain 14 µg/L of arsenic and 2.1 mg/L of fluoride, exceeding the respective primary and secondary standard for these two elements. The mandatory fluoride limit in Nevada is set at 2.0 mg/L. This paper presents results from pilot scale tests conducted to achieve simultaneous compliance with the arsenic and fluoride standards. Activated alumina (AA) is the U.S. Environmental Protection Agency (USEPA) designated best available technology (BAT) for arsenic and fluoride removal. However, bench-scale evaluation indicated that although AA can remove both arsenic and fluoride, its bed life is rather short, especially for fluoride removal. Although iron based adsorptive media has a much longer bed life for arsenic removal compared with AA, it can not remove fluoride. Therefore, an additional unit process must be added for fluoride removal if iron based adsorptive media is selected for arsenic removal. Pilot test conducted on site using the same water with a proprietary filter media demonstrated that coagulation filtration with ferric chloride can reduce arsenic by over 90 percent at a dose of 1 mg/L, much lower than demonstrated by bench test and those reported in literature. Pilot tests were conducted to determine the optimum dose for simultaneous removal for both arsenic and fluoride as well as to investigate potential additional arsenic removal mechanisms associated with the proprietary filter media. Results of these pilot tests indicated that: the proprietary media has adsorption capacity for arsenic and will result in over estimated arsenic removal by coagulation/filtration if the adsorptive capacity is not taking into consideration; simultaneous removal of arsenic and fluoride can be achieved by coagulation/filtration with a mixture of ferric and alum or with alum alone; and, the optimum dose for simultaneous removal of arsenic and fluoride for the Coyote Springs source water is determined to be 7.5 ppm alum. Includes tables, figures.