The anaerobic digestion of substrates with high ammonia content has always been a bottleneck in the methanisation process of biomasses. Since microbial communities in anaerobic digesters are sensitive to free ammonia at certain conditions, the digestion of nitrogen-rich substrates such as livestock wastes may result in inhibition/toxicity eventually leading to process failures, unless appropriate engineering precautions are taken. There are many different options reported in literature to remove ammonia from anaerobic digesters to achieve a safe and stable process so that along with high methane yields, a good quality of effluents can also be obtained. Conventional techniques to remove ammonia include physical/chemical methods, immobilization and adaptation of microorganisms, while novel methods include ultrasonication, microwave, hollow fiber membranes and microbial fuel cell applications. This paper discusses conventional and novel methods of ammonia removal from anaerobic digesters using nitrogen-rich substrates, with particular focus on recent literature available about this topic.
Research Article|July 06 2017
Methods of ammonia removal in anaerobic digestion: a review
1Department of Bioprocess-Engineering, Leibniz Institute for Agricultural Engineering and Bio-Economy Potsdam, Max-Eyth-Allee 100, D-14469 Potsdam, Germany E-mail: email@example.com
2Department of Biotechnology, University of Applied Sciences, Lohbrügger Kirchstraße 65, 21033 Hamburg, Germany
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Niclas Krakat, Burak Demirel, Reshma Anjum, Donna Dietz; Methods of ammonia removal in anaerobic digestion: a review. Water Sci Technol 25 October 2017; 76 (8): 1925–1938. doi: https://doi.org/10.2166/wst.2017.406
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