Journal of Water Supply: Research and Technology—AQUA Vol 56 No 1 pp 69–74 © IWA Publishing 2007 doi:10.2166/aqua.2007.061
Iron and manganese amended activated alumina – a medium for adsorption/oxidation of arsenic from water
Anuj Kumar Dhiman and Malay Chaudhuri
Kaveri Infrastructure (P) Ltd, Kaveri House, B-5, Geetanjali Enclave, Malviya Nagar, New Delhi 110017, India
Civil Engineering Programme, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak Darul Ridzuan, Malaysia Tel.: +60 5 368 7286Fax: +60 5 365 6716malaychaudhuri@yahoo.com; malay@iitk.ac.in
ABSTRACT
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.
Keywords: activated alumina; adsorption/oxidation; arsenic removal; iron; manganese
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