Arsenic Removal in Water Treatment

A poisonous and carcinogenic metalloid, arsenic is found in the environment through natural and human-made sources. The gravest danger emanates from dissolved arsenic in our drinking water. Having an effective “arsenic filter” is therefore essential for ensuring a safe supply of drinking water.

In the early 1990s, new studies revealed that, aside from its acute toxicity, even a tiny concentration of arsenic is harmful, given its cancer-causing effect. It was for this reason that a threshold limit value of 10 μg/l was set for arsenic in drinking water. At that time, no simple, technical solution existed for small and medium-sized waterworks to reliably remove arsenic and meet the newly-defined limit value. This gave rise, in the early 1990s, to the development of the granular adsorbent known as GEH®. Since arsenic is commonly found in water as a dissolved substance, such as arsenate (As(V)) or arsenite (As(III)), conventional filter materials have reached their bounds of possibilities. The following methods are, in principle, suitable for removing arsenic:

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