Journal
WATER SCIENCE AND TECHNOLOGY
Volume 76, Issue 11, Pages 3150-3159Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2017.462
Keywords
autotrophic denitrification; bioelectrochemical systems; cathodic denitrification; nitrogen removal
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Addition of an external carbon source is usually necessary to guarantee a sufficiently high C/N ratio and enable denitrification in wastewater treatment plants (WWTPs). Alternatively, denitrification processes using autotrophic microorganisms have been proposed i.e., with the use of H-2 as electron donor or with the use of cathodic denitrification in bioelectrochemical systems (BES), in which electrons are transferred directly to a denitrifying biofilm. The aim of this work was to investigate and demonstrate the feasibility of applying an easy-to-operate BES as a polishing mechanism for treated secondary clarified effluent from a municipal WWTP, containing low levels of organic matter, buffer capacity and low concentrations of remaining nitrate. In the proposed system, nitrogen removal rates (0.018-0.121 Kg N m(-3) d(-1)) increased with the nitrogen loading rates, suggesting that biofilm kinetics were not rate limiting. The lowest energy consumption for denitrification was 12.7 kWh Kg N-1, equivalent to 0.021 kWh m(-3) and could be further reduced by 14% by adding recirculation circuits within both the anode and cathode.
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