After the arsenic removal process, the treated water has a low arsenic concentration, typically around 1-3 mg/L. If an even lower arsenic concentration is required, a polishing step with enhanced arsenic removal can be included.
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The process comprises the neutralization of acidic streams and the advanced removal of metal impurities, including Ni, Cd, Cu, Sb, and Zn. The final product of the arsenic removal process is treated water that can be safely discharged into the environment or recycled back for process use. The selection of the arsenic treatment process is governed by residual stability. The residue of the arsenic removal process is a stable solid precipitate, which will pass the EU CEN and US EPA TCLP leaching tests for hazardous, arsenic-containing solid waste.
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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 s, 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 s, 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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