Journal
WATER AIR AND SOIL POLLUTION
Volume 228, Issue 5, Pages -Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11270-017-3342-4
Keywords
Fecal wastewater; Anaerobic baffled reactor (ABR); Microbial fuel cell (MFC); Microbial electrolysis cell (MEC); Electrodes
Funding
- RTTC-China
- Natural Science Foundation of China [21206092]
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Simultaneous power generation and fecal wastewater treatment were investigated using a combined ABR-MFC-MEC system (anaerobic baffled reactor-microbial fuel cell-microbial electrolysis cell). The installation of multi-stage baffles can benefit retaining the suspended solids in the system and help separate the hydrolysis-acidification and the methanogen processes. The efficiencies of the nitrification-denitrification process were improved because of the weak current generation by coupling the microbial electrochemical device (MFC-MEC) with the ABR unit. Maximum removal rates for chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N)were 1.35 +/- 0.05 kg COD/m(3)/day and 85.0 +/- 0.4 g NH4+-N/m(3)/day, respectively, while 45% of methane (CH4), 9% of carbon dioxide (CO2), and 45% of nitrogen gas (N-2) contents in volume ratio were found in the collected gas phase. An average surplus output voltage of 452.5 +/- 10.5 mV could be achieved from the combined system, when the initial COD concentration was 1500.0 +/- 20.0 mg/L and the initial NH4+-N concentration was 110.0 +/- 5.0mg/L, while the effluent COD could reach 50.0 mg/L with an HRT of 48 h. The combined process has the potential to treat fecal wastewater efficiently with nearly zero energy input and a fair bio-fuel production.
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