Journal
JOURNAL OF POWER SOURCES
Volume 441, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227124
Keywords
Pilot microbial electrochemistry system (MES); Comprehensive operation strategy; Alternating direction parallel flow; Intermittent aeration optimization; Hydrophobic surface coating
Funding
- National Key Research and Development Program of China [2017YFA0207201, 2016YFE0106500]
- National Key Research and Development Program [2016YFC0401104]
- National Natural Science Foundation Youth Fund [51908403]
- National Natural Science Fund of China [21673061]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA201936, QA201912]
- Innovation Team in Key Areas of the Ministry of Science and Technology
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A 1.5 m(3) pilot biocathode microbial electrochemistry system (MES) is developed with separate plug-in modular design and operated in a municipal wastewater treatment plant for treating effluent of primary sedimentation tank. Comprehensive operation strategies are investigated for the operation of pilot MES and for the high-efficiency operation of further full-size MES. Controlling with wastewater distribution system, an alternating direction parallel flow mode is achieved in pilot biocathode MES at 48 h interval and prevents the substrate limitation to downstream anodes along flow path. Intermittent aeration strategy with various air-liquid (A/L) ratios is optimized to save aeration energy of biocathode. Consequently, the optimized energy requirement is only 7.3% of that in a typical activated sludge process (0.3 kWh m(-3)). The dynamic microbial separator in pilot MES effectively blocks the oxygen leakage from cathode to anode compartment under tested A/L ratios (2.9-40) and enables aeration process to mainly affect biocathode performance. The incomplete polytetrafluoroethylene-coated (PTFE-coated) carbon brushes are well performed as biocathodes of pilot MES, improving the maximum power output by 15% under oxygen-limited condition. The hydrophobic surface provides oxygen source for cathode reduction due to the high air-affinity and supports a great amount of biomass on cathode brushes.
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