Journal
BIORESOURCE TECHNOLOGY
Volume 146, Issue -, Pages 530-536Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.07.130
Keywords
Microbial electrolysis cell; Nitrogen recovery; Sludge liquor; Anaerobic digester centrate
Funding
- Marie Curie career integration grant (bioanode) from the European Commission
- Swedish Research Council (VR) [2010-612]
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In this study, a bioelectrochemical reactor was investigated for simultaneous hydrogen production and ammonium recovery from reject water, which is an ammonium-rich side-stream produced from sludge treatment processes at wastewater treatment plants. In the anode chamber of the reactor, microorganisms converted organic material into electrical current. The electrical current was used to generate hydrogen gas at the cathode with 96 +/- 6% efficiency. Real or synthetic reject water was fed to the cathode chamber where proton reduction into hydrogen gas resulted in a pH increase which led to ammonium being converted into volatile ammonia. The ammonia could be stripped from the solution and recovered in acid. Overall, ammonium recovery efficiencies reached 94% with synthetic reject water and 79% with real reject water. This process could potentially be used to make wastewater treatment plants more resource-efficient and further research is warranted. (c) 2013 Elsevier Ltd. All rights reserved.
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