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Investigating the effects of pH and buffer on MFC treating winery wastewater
Authors: Tianlong Liu,
Anupama Vijaya Nadaraja Pillai,
Justin Friesen,
Kiranpreet Gill,
Deborah J. Roberts
Identifier: CSBE19126
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Published in: CSBE-SCGAB Technical Conferences » AGM Vancouver 2019
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Description: Microbial fuel cell (MFC) technology has been efficiently demonstrated in lab scale studies to effectively treat organic rich wastewater from agroindustries. Winery wastewater is identified as a promising feed for MFC due to its high chemical oxygen demand (COD), however its high acidity poses a major challenge. In this study, a lab scale air cathode MFC (volume = 100 mL, external resistance = 10 K?, COD = 1000 mg/L) was designed and fabricated to investigate the effect of different pH (4.5, 5.5, 6.5 and 7.5) and buffer conditions with synthetic winery wastewater. MFC performance was evaluated in terms of COD removal, output voltage, columbic efficiency, and polarization curve. We observed maximum voltage (0.623V), COD removal (89.63%), and columbic efficiency (1.80%) at pH 6.5. Buffering is necessary to maintain the pH at optimum condition and to select an ideal buffer we examined phosphate buffer (PB) and bicarbonate buffer (BB) at different concentrations. PB (10 mM) maintained a constant pH (6.5 ? 0.2), high output voltage (0.61V) and COD removal efficiency (85.4%~88.9%). Fluorescent in situ hybridisation was used for microbial community profiling and revealed visible differences in the microbial population under different pH conditions. Results showed Betaproteobacteria was dominated at pH 6.5, whereas Gammaproteobacteria dominated at both pH 5.5 and 7.5. Interestingly, we observed the flourishing of yeast at pH 4.5 leading to a high COD removal but low output voltage. This study shows the suitability of MFC for winery wastewater treatment provided with a suitable buffer concentration to maintain pH.
Keywords: Microbial fuel cell, winery wastewater, wastewater treatment, pH, COD
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Date: 2019-07-15
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Conference name: CSBE/SCGAB 2019 Annual Conference, Vancouver, BC, 14-17 July 2019.
Session name: Environment
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Type: Presentation
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Publication type: Text.Abstract
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Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
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DOI:
Description: Microbial fuel cell (MFC) technology has been efficiently demonstrated in lab scale studies to effectively treat organic rich wastewater from agroindustries. Winery wastewater is identified as a promising feed for MFC due to its high chemical oxygen demand (COD), however its high acidity poses a major challenge. In this study, a lab scale air cathode MFC (volume = 100 mL, external resistance = 10 K?, COD = 1000 mg/L) was designed and fabricated to investigate the effect of different pH (4.5, 5.5, 6.5 and 7.5) and buffer conditions with synthetic winery wastewater. MFC performance was evaluated in terms of COD removal, output voltage, columbic efficiency, and polarization curve. We observed maximum voltage (0.623V), COD removal (89.63%), and columbic efficiency (1.80%) at pH 6.5. Buffering is necessary to maintain the pH at optimum condition and to select an ideal buffer we examined phosphate buffer (PB) and bicarbonate buffer (BB) at different concentrations. PB (10 mM) maintained a constant pH (6.5 ? 0.2), high output voltage (0.61V) and COD removal efficiency (85.4%~88.9%). Fluorescent in situ hybridisation was used for microbial community profiling and revealed visible differences in the microbial population under different pH conditions. Results showed Betaproteobacteria was dominated at pH 6.5, whereas Gammaproteobacteria dominated at both pH 5.5 and 7.5. Interestingly, we observed the flourishing of yeast at pH 4.5 leading to a high COD removal but low output voltage. This study shows the suitability of MFC for winery wastewater treatment provided with a suitable buffer concentration to maintain pH.
Keywords: Microbial fuel cell, winery wastewater, wastewater treatment, pH, COD
Résumé:
Mots-clés:
Citation:
Volume:
Issue:
Pages -
Contributor:
Date: 2019-07-15
Technical field:
Conference name: CSBE/SCGAB 2019 Annual Conference, Vancouver, BC, 14-17 July 2019.
Session name: Environment
Other information:
Type: Presentation
Format:
Publication type: Text.Abstract
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
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