In a laboratory study, iron and manganese amended activated alumina (IMAA) showed promise as an effective medium for removing arsenic [As(III) and As(V)] from groundwater. Batch adsorption/oxidation kinetic test indicated that the effectiveness of the IMAA medium was due to in situ oxidation of As(III) to As(V) and higher adsorption of As(V) by the medium. A home arsenic removal unit, containing 4 L of IMAA or AA and operated at 6 L/h, produced 2400 L and 2340 L or 1392 L and 1320 L of water in two cycles of runs when the influent arsenic concentration was 1.0 mg/L [0.6 mg/L of As(III) and 0.4 mg/L of As(V)]. The IMAA medium should be subjected to field trials to assess the long-term effects on performance, such as loss of medium capacity, attrition of the iron and manganese coating, fouling by organics, and pH and competing ion effects.
Iron and manganese amended activated alumina – a medium for adsorption/oxidation of arsenic from water
Anuj Kumar Dhiman, Malay Chaudhuri; Iron and manganese amended activated alumina – a medium for adsorption/oxidation of arsenic from water. Journal of Water Supply: Research and Technology-Aqua 1 February 2007; 56 (1): 69–74. doi: https://doi.org/10.2166/aqua.2007.061
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