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This study integrated ethanol tolerant yeast with laccase activity into a constructed wetland-microbial fuel cell (CW-MFC) to treat winery wastewater and generate electricity. The system achieved significant removal of chemical oxygen demand (COD) and phenol, as well as electricity production. The use of laccase-producing yeast enhanced the treatment efficiency and power generation of the CW-MFC.

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What they did

System
MFC
Substrate
synthetic mixture
Inoculum
ethanol tolerant yeast (Pichia sp. ET-KK)

What worked

Power density0.80mW/m²best of 2
Current density0.14A/m²
OCV0.28V

Abstract

Winery wastewater is one of the most concerning wastewater because it contains a high concentration of ethanol and phenolic compound that can inhibit the wastewater treatment potential of microorganisms. In this study, the ethanol tolerant yeast with laccase activity was integrated with constructed wetland -microbial fuel cell (CW-MFC) to remove ethanol contamination wastewater treatment limitation and simultaneously generate electrical energy. For the experiment, ethanol tolerant yeast with laccase activity was selected and grown in the CW-MFC filled with winery wastewater. The wastewater treatment (chemical oxygen demand (COD) and phenol removal) potential and electrochemical properties were monitored. The results indicated that the maximal laccase activity of 158.12±0.52 U/mL was gained from the yeast strain ET-KK. The maximal current density and power density of 139.17±1.44 mA/m² and 38.74±0.80 mW/m² were generated where the maximal COD and phenol removal of 79.14±0.92% and 85.04±0.07% were obtained. This study used the CW-MFC integrated with laccase-producing ethanol tolerant yeast for winery wastewater treatment and electricity generation.

Key findings

  • Maximal laccase activity of 158.12±0.52 U/mL was obtained from the yeast strain ET-KK
  • Maximal current density and power density of 139.17±1.44 mA/m² and 38.74±0.80 mW/m² were generated
  • Maximal COD and phenol removal of 79.14±0.92% and 85.04±0.07% were achieved

Keywords

WastewaterMicrobial fuel cellWineryChemical oxygen demandSewage treatmentPulp and paper industry

Identifiers

DOI
10.33263/briac132.157
Journal
Biointerface Research in Applied Chemistry
Year
2022