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THE EFFECT OF WATER CHEMISTRY AND IRON PARTICLE PROPERTIES ON THE REMOVAL OF ARSENIC FOLLOWING THE OXIDATION OF FERROUS IRON
Citation:
Lytle*, D A. AND T J. Sorg*. THE EFFECT OF WATER CHEMISTRY AND IRON PARTICLE PROPERTIES ON THE REMOVAL OF ARSENIC FOLLOWING THE OXIDATION OF FERROUS IRON. Presented at AWWA Annual Conference, New Orleans, LA, 6/16-20/2002.
Description:
The current MCL for arsenic is being revised to a lower level by the USEPA. Many new utilities, particularly small utilities, will be forced to add an arsenic removal process or fine tune their curent water treatment process to meet the new MCL. Many arsenic removal processes rely on the adsorptive properties of iron minerals such as the case of iron based filter media to achieve arsenic removal. In some areas of the country, groundwaters contain natural iron (and manganese) as well as arsenic. Significant arsenic removal is achievable in these cases through iron removal which again relies on the adsorptive properties and water chemistry. Research is needed to better understand arsenic removal by adsorption to iron materials, particularly as it relates to water chemistry, aqueous arsenic chemistry and iron surface chemistry. This paper will examine the effect of wate chemistry on the removal of arsenic(V) to iron solids following the oxidation of ferrous iron. The effect of oxidant type (oxygen, chlorine and potassium permanganate), pH and know interferences on arsenic removal were examined. Removal will be explained by a detailed examination of the iron particle properties and chemistry.