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


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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