The combination of microbial reduction and further microbial oxidation of iron was applied to the treatment of food-processing wastewater and recovery of ammonium. Fe2+ ions were formed by iron-reducing bacteria under anaerobic conditions. Ammonium was recovered by co-precipitation with negatively charged iron hydroxides produced during oxidation of Fe2+ by iron-oxidizing bacteria under microaerophilic conditions. The value-added by-product of this process can be used as a slowly released ammonium fertilizer.
Iron-mediated removal of ammonium from strong nitrogenous wastewater from food processing
V. Ivanov, J.-Y. Wang, O. Stabnikova, V. Krasinko, V. Stabnikov, S.T.-L. Tay, J.-H. Tay; Iron-mediated removal of ammonium from strong nitrogenous wastewater from food processing. Water Sci Technol 1 March 2004; 49 (5-6): 421–431. doi: https://doi.org/10.2166/wst.2004.0783
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