Simultaneous bioelectricity generation and water desalination using Oscillatoria sp. as biocatalyst in photosyntheticmicrobial desalination cell

Globally, the scarcity of drinking water has triggered the researchers towards the development of desalination techniques to turn up saline water into potable. Microbial Desalination Cell (MDC) is a novel green technology that shows potential approach for desalination along with electricity generation and wastewater treatment. However, the expensive catholyte/catalyst in the cathode side has limited the MDC for real time application. Hence, the main objective of this work was to investigate the electricity generation during dairy wastewater treatment and desalination efficiency using biocathode (Oscillatoria sp.) in the MDC. The results showed that the maximum open circuit voltage of 652 +/- 10 mV, COD removal efficiency of 80.2 +/- 0.5% and desalination efficiency of 65.8 +/- 0.5%, were achieved respectively. The effect of saline water concentration was investigated and the performance of MDC was compared with real (sea) water. This study demonstrated that Oscillatoria sp. could be used as a potential biocatalyst in the cathode chamber for enhancing salinity removal along with electricity generation and wastewater treatment in the MDC. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

This study successfully demonstrated the use of Oscillatoria sp. as a biocatalyst in the cathode chamber for enhancing salinity removal, electricity generation, and wastewater treatment in the MDC. The results showed maximum open circuit voltage of 652 +/- 10 mV, COD removal efficiency of 80.2 +/- 0.5%, and desalination efficiency of 65.8 +/- 0.5% were achieved with the use of biocathode during dairy wastewater treatment and desalination process.