Arsenic Removal by Manganese Greensand Filters

by Thon Phommavong, Saskatchewan Environment, Regina, Canada,
T. Viraraghavan, Saskatchewan Environment, Regina, Canada,



Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment

Abstract:

Some of the small communities in Saskatchewan are expected to have difficulty complying with the new maximum acceptable concentration (MAC) of 25 ?g/L for arsenic. A test column was set up in the laboratory to study the removal of arsenic from the potable water using oxidation with KMnO₄, followed by manganese greensand filtration. Tests were run using water from the tap having a background arsenic concentration of <0.5 ?g/L and iron concentration in the range of 0.02 to 0.77 mg/L. The test water was spiked with arsenic and iron. Results showed that 61% to 98% of arsenic can be removed from the potable water by oxidation with KMnO₄ followed by manganese greensand filtration.

Subject Headings: Arsenic | Water treatment | Manganese | Water supply | Oxidation | Iron compounds | Filtration | Canada | Saskatchewan

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