Nitrogen and energy balances of a combined anaerobic digestion and electrochemical oxidation process for dairy manure management
Ikko Ihara A D , Kiyohiko Toyoda A , Tsuneo Watanabe B and Kazutaka Umetsu CA Department of Agricultural Engineering and Socio Economics, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
B Department of Electrical Engineering, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0391, Japan.
C Department of Agro-Environmental Sciences, Obihiro University of Agriculture and Veterinary Medicine, Inadacho, Obihiro 080-8555, Japan.
D Corresponding author. Email: ihara@port.kobe-u.ac.jp
Australian Journal of Experimental Agriculture 48(2) 208-212 https://doi.org/10.1071/EA07254
Submitted: 7 August 2007 Accepted: 19 November 2007 Published: 2 January 2008
Abstract
Anaerobic digestion and electrochemical oxidation were investigated for their potential to recycle carbon and degrade nitrogen from dairy manure; the energy balance of this combination of treatments was also evaluated. Anaerobic digestion is a sustainable technology that allows recovery of biomass energy and treatment of animal wastes for carbon recycling. Since the anaerobic digestion process performs denitrification poorly, almost all nitrogenous substances are discharged in digested effluent as ammonia. The ammonium nitrogen in anaerobically digested effluent is degraded by electrochemical oxidation with an unsacrificial anode. The electrochemical oxidation requires inputs of electricity. We evaluated the feasibility of using electricity generated by a full-scale biogas plant, producing biogas from dairy manure, for the electrochemical oxidation of ammonium nitrogen in anaerobically digested effluent. Data on the amount of electricity generated by such a plant were compared with data on the electricity requirements of the electrochemical oxidation process to determine the energy balance of the two processes. The results indicated that electricity generated from a biogas plant was able to supply 24 to 33% of the electricity required for the electrochemical oxidation.
Acknowledgements
This research is in part supported by the Grant in Aid of Scientific research for Scientific Research B (No. 18380145) from the Japan Society for the Promotion Sciences.
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