Photosynthetic Microbial Desalination Cell to Treat Oily Wastewater Using Microalgae Chlorella Vulgaris

Microbial desalination cell (MDC) offers a new and sustainable approach to desalinate saltwater by directly utilizing the electrical power generated by bacteria during organic matter oxidation. In this study, we used microalgae Chlorella Vulgaris in the cathode chamber to produce oxygen as an electron accepter by photosynthesis process for generate bioelectricity power and treat oil refinery wastewater by microorganisms in both anode and cathode.The power density generated by this Photosynthetic Microbial Desalination Cell (PMDC) with ۱KΩ external resistance at the first ۴th hr. of operation period was ۰.۶۷۸ W/m۳ of anode volume and ۰.۶۳ W/m۳ of cathode volume. It increased after one day to a peak value of (۴.۳۲ W/m۳ of anode volume and ۴.۰۱۳ W/m۳ of cathode volume). The microalgae growth in the biocathode chamber followed in terms of optical density. The optical density increased from ۰.۵۴۶ at the beginning of the system operation to ۱.۷۱ after ۲۴ days of operation period. The percentage removal of chemical oxygen demand (COD) of oil refinery wastewater was ۹۷.۳۳% and ۷۹.۲۲% in anode and cathode chamber, respectively. The microalgae in the biocathode were able to remove volatile compounds causing odor from the influent wastewater. TDS removal rate ۱۵۹.۷۲۲ ppm/h with initial TDS in desalination chamber of ۳۵۰۰۰ ppm.Microbial desalination cell (MDC) offers a new and sustainable approach to desalinate saltwater by directly utilizing the electrical power generated by bacteria during organic matter oxidation. In this study, we used microalgae Chlorella Vulgaris in the cathode chamber to produce oxygen as an electron accepter by photosynthesis process for generate bioelectricity power and treat oil refinery wastewater by microorganisms in both anode and cathode. The power density generated by this Photosynthetic Microbial Desalination Cell (PMDC) with ۱KΩ external resistance at the first ۴th hr. of operation period was ۰.۶۷۸ W/m۳ of anode volume and ۰.۶۳ W/m۳ of cathode volume. It increased after one day to a peak value of (۴.۳۲ W/m۳ of anode volume and ۴.۰۱۳ W/m۳ of cathode volume). The microalgae growth in the biocathode chamber followed in terms of optical density. The optical density increased from ۰.۵۴۶ at the beginning of the system operation to ۱.۷۱ after ۲۴ days of operation period. The percentage removal of chemical oxygen demand (COD) of oil refinery wastewater was ۹۷.۳۳% and ۷۹.۲۲% in anode and cathode chamber, respectively. The microalgae in the biocathode were able to remove volatile compounds causing odor from the influent wastewater. TDS removal rate ۱۵۹.۷۲۲ ppm/h with initial TDS in desalination chamber of ۳۵۰۰۰ ppm.