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Characterization of different iron oxide coated sand media for adsorptive arsenic removal

机译：添加氧化铁涂层砂介质对吸附砷的表征

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Presence of arsenic (As) in groundwater used for drinking water production is a global problem affecting countries on all five continents. Several treatment technologies have been adopted for removal of As from drinking water. Taking into account removal efficiency and effect on the environment, the most promising treatment method at present is adsorption on commercial granular adsorptive media, in particular iron-oxides based ones (AWWARF & USEPA, 2005; Petrusevski et al., 2007a). These As adsorbents are, however, expensive and fairly selective, i.e. they have significantly lower adsorption capacity at higher pH, and for arsenite, As(Ⅲ), which is commonly present in anoxic groundwater. Furthermore, commercial adsorbents cannot be regenerated, but need to be replaced once exhausted, which results in both, high operational costs and significant waste generation.
机译：用于饮用水生产的地下水中的砷（AS）的存在是影响所有五大洲国家的全球问题。 已经采用了几种治疗技术去除饮用水。 考虑到对环境的去除效率和影响，目前最有前景的处理方法是对商业颗粒吸附介质的吸附，特别是基于铁氧化物（Awwarf＆Usepa，2005; Petrusevski等，2007a）。 然而，这些作为吸附剂是昂贵且相当的选择性的，即它们在较高pH下具有显着降低的吸附能力，以及砷酸盐，如（Ⅲ），其通常存在于缺氧地下水中。 此外，商业吸附剂不能再生，但需要一旦耗尽一次，这导致了高运营成本和大量浪费产生。

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