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Energy Balance Affected by Electrolyte Recirculation and Operating Modes in Microbial Fuel Cells
Author(s) -
Jacobson Kyle S.,
Kelly Patrick T.,
He Zhen
Publication year - 2015
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143015x14212658613235
Subject(s) - microbial fuel cell , energy balance , electrolyte , energy recovery , chemistry , cathode , specific energy , electrode , batch reactor , waste management , energy (signal processing) , environmental science , pulp and paper industry , environmental engineering , thermodynamics , catalysis , anode , engineering , biochemistry , physics , statistics , mathematics
Energy recovery and consumption in a microbial fuel cell (MFC) can be significantly affected by the operating conditions. This study investigated the effects of electrolyte recirculation and operation mode (continuous vs sequence batch reactor) on the energy balance in a tubular MFC. It was found that decreasing the anolyte recirculation also decreased the energy recovery. Because of the open environment of the cathode electrode, the catholyte recirculation consumed 10 to 50 times more energy than the anolyte recirculation, and resulted in negative energy balances despite the reduction of the anolyte recirculation. Reducing the catholyte recirculation to 20% led to a positive energy balance of 0.0288 kWh m −3 . The MFC operated as a sequence batch reactor generated less energy and had a lower energy balance than the one with continuous operation. Those results encourage the further development of MFC technology to achieve neutral or even positive energy output.