The US Environmental Protection Agency (EPA) and World Health Organization (WHO) recommend arsenic maximum contaminant level (MCL) of 10 micrograms per liter due to adverse health effects. Arsenic is one of WHO’s 10 chemicals of major public health concern. In addition, some US states have adopted even lower limits (5 micrograms per liter). Over the past two decades, this regulation has prompted hundreds of municipalities to utilize numerous treatment technologies for the removal of arsenic.
In some cases, arsenic is present in a form that is not readily removed by conventional adsorption treatments. Oxidation by permanganate solves the problem.The oxidation byproduct, manganese dioxide, aids in the adsorption and removal of arsenic by mechanical means.
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