Adsorptive media technology is frequently used by small water systems to remove arsenic because of its simplicity and efficiency. Current practice is to replace the media when it no longer reduces arsenic below the maximum contaminant level of 10 µg/L that the US Environmental Protection Agency has set for drinking water. Media replacement typically accounts for approximately 80% of the total operational and maintenance costs. One potential option to reduce the cost is onsite regeneration and reuse of the media. To evaluate the regeneration option, three consecutive regeneration studies were conducted on a full‐scale adsorptive media system. This article, the first of a two‐part series, describes the regeneration process and its efficacy in stripping arsenic and other contaminants from exhausted media. Study results found that a three‐step regeneration process of media backwash, caustic regeneration, and acid neutralization conditioning proved effective for stripping arsenic and other contaminants from the exhausted media.

中文翻译：

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除砷铁床吸附介质系统的再生，第 1 部分：再生过程。

由于吸附介质技术简单且高效，小型水系统经常使用吸附介质技术来去除砷。目前的做法是，当介质不再将砷降低到美国环境保护署为饮用水设定的最大污染物水平 10 µg/L 以下时，需要更换介质。介质更换通常占总运营和维护成本的大约 80%。降低成本的一种潜在选择是介质的现场再生和再利用。为了评估再生选项，在全尺寸吸附介质系统上进行了三项连续的再生研究。本文是由两部分组成的系列文章的第一篇，介绍了再生过程及其从废介质中去除砷和其他污染物的功效。研究结果发现，介质反洗、碱再生和酸中和调节的三步再生过程被证明可以有效地从废介质中去除砷和其他污染物。