Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 523, Issue -, Pages 122-128Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2016.09.063
Keywords
Microbial electrodialysis and chemical-production cell; Bipolar membrane; Citric acid production; Energy consumption
Categories
Funding
- National Natural Science Foundation of China [51278500, 41471181, 51308557]
- Guangzhou Science & Technology Department [201510010125, 201604010043]
- Guangdong Science & Technology Department [2014A010106011]
- Natural Science Foundation of Guangdong Province [S2013010012984, 2015A030313102, 2015A030313169]
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The aim of this study was to investigate the feasibility of citric acid (CA) production using a biological electrodialysis with bipolar membrane, i.e., the microbial electrolysis desalination and chemical-production cell (MEDCC). To optimize the performance, batch, recirculation, and packed ion-exchange resin (IER) modes were carried out in the MEDCC. With 0.1 M Na(3)Cit, the maximum current density was 7.7 +/- 0.3, 9.2 +/- 0.6, and 11.1 +/- 0.5 A/m(2) in the batch, recirculation, and packed IER modes, respectively. The maximum CA production of 0.443 +/- 0.096 M was achieved within 96 h operation using 0.5 M Na(3)Cit with the recirculation mode. The lowest internal resistance of 48.5 Omega was observed with the packed IER mode. The lowest electric consumption of 0.81 +/- 0.03 kW h/kg in the MEDCC was achieved with 0.5 M Na(3)Cit and the recirculation mode, which was only 10-40% of the electrical energy consumed in other electrodialysis processes. The MEDCC with the recirculation mode had higher abundance of Geobacter and higher biomass in the anode biofim than that with the batch mode, resulting in better performance in terms of higher current density and CA production. The MEDCC should be a potential valuable method for CA production with low energy consumption.
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