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Rapid Small-Scale Column Tests of Metal-based Adsorbent Media for Arsenic Removal from Groundwater Sources in California.

机译：加利福尼亚州从金属源去除砷的金属基吸附剂的快速小型色谱柱测试。

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摘要

The United States Environmental Protection Agency (EPA) lowered the maximum contaminant level (MCL) for arsenic in drinking water in 2001, effective January 2006, from 50 micrograms per liter (μg/L) to 10 μg/L resulting in increased development of arsenic removal technologies. Water systems throughout the U.S., in particular small water systems, have found it difficult to meet this MCL with the resources they have. The EPA has created a series of documents to assist these systems in choosing a cost-effective water treatment technology with recommendations for adsorption technology. When deciding on adsorption technology, there is a plethora of adsorbent media to select from, such that costs will vary drastically from one media to the other. In this work, four metal-based iron hydroxides (granular ferric hydroxide, Bayoxide E33 goethite, Metsorb G titanium dioxide, and NXT-2 lanthanum hydroxide) were compared using rapid small scale column tests (RSSCT). The RSSCTs were conducted with three groundwater sources from select communities in the Central Valley region of California to determine impacts on arsenic adsorption capacity. The breakthrough curves from the RSSCTs were used to approximate the cost of adsorption treatment with respect to replacing adsorbent media. The results of this work suggest Bayoxide E33 may be the cost effective treatment option for the small water systems that were evaluated. Interferences in effective arsenic removal include phosphorus, silica, high arsenic concentrations, low alkalinity, and high pH. The RSSCTs completed for Manteca groundwater supplies were packed with Bayoxide E33 and validated the dependence of arsenic adsorption capacity on pH, phosphorus, arsenic, and alkalinity.
机译：自2006年1月起，美国环境保护局（EPA）于2001年将饮用水中砷的最大污染物水平（MCL）从每升50微克（μg/ L）降低至10μg/ L，从而导致砷的增长清除技术。美国各地的供水系统，特别是小型供水系统，发现很难用其拥有的资源来满足该MCL。 EPA创建了一系列文档，以帮助这些系统选择具有成本效益的水处理技术，并提出吸附技术的建议。在决定吸附技术时，有太多的吸附剂介质可供选择，因此，一种介质之间的成本将发生巨大变化。在这项工作中，使用快速小规模柱测试（RSSCT）对四种金属基氢氧化铁（颗粒状氢氧化铁，Bayoxide E33针铁矿，Metsorb G二氧化钛和NXT-2氢氧化镧）进行了比较。用来自加利福尼亚中央山谷地区某些社区的三个地下水源进行了RSSCT，以确定对砷吸附能力的影响。来自RSSCT的穿透曲线被用来估算替换吸附介质所需的吸附处理成本。这项工作的结果表明，对于所评估的小型水系统，Bayoxide E33可能是具有成本效益的处理方案。有效去除砷的干扰因素包括磷，二氧化硅，高砷浓度，低碱度和高pH。为Manteca地下水供应完成的RSSCT装满了Bayoxide E33，验证了砷吸附能力对pH，磷，砷和碱度的依赖性。

著录项

  • 作者

    Chin, Jacqueline Pui Yun.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Engineering Civil.;Engineering Environmental.
  • 学位 M.S.
  • 年度 2012
  • 页码 41 p.
  • 总页数 41
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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