Effect of Hydraulic Retention Time on MFC-A2/O Process for Domestic Wastewater Treatment

Nan LUO, Yan-mei GAO, Xiao-jia LIU, Tao XIE, Xiao GUO

Abstract


A 10L scale MFC coupled A2/O system was built, with the anaerobic tank as anode chamber to remove carbon and the anoxic tank as cathode chamber to denitrify. This coupled system could achieve max output current after 30 days. During the study phase, the hydraulic retention time (HRT) was optimized to improve wastewater treatment efficiency and power generation. The results showed that the coupled system could obtain best pollutants removal effect when HRT=16h. Compared with control reactor, concentrations of COD and TN in the effluent of the coupled system could be reduced by 14.6% and 10.1%. And the power density (external resistance = 100Ω) of the coupled system was 612mW/m3 in the meantime. Correspondingly, the optimum HRT when the coupled system achieved highest power generation was 12h, and the max power density was 808mW/m3.

Keywords


Microbial fuel cell, Anaerobic–anoxic–oxic process, Wastewater treatment, Hydraulic retention time


DOI
10.12783/dteees/icesee2017/7862

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