Bioelectricity Generation Using Chlorella Regularis And Microcystis Aeruginosa Biomass As Electron Donor In A Bioanode Microbial Fuel Cell

In this study,microalgal biomass waste(Chlorella regularis)and cyanobacterial biomass(Microcystis aeruginosa)were treated while simultaneously producing bioelectricity in a microbial fuel cell(MFC).They were the sole electron donor and microalgal biomass was enriched with easily biodegradable proteins(46%)and carbohydrates(22%)while the high biodegradability of M.aeruginosa,represented by BOD/COD ratio of~0.65.For MFCs treated with microalgal biomass,the generated power density was 0.86 W/m~2 and the columbic efficiency reached?61.5%.The power generation could be further increased to 1.07 W/m~2 by using a biomass waste concentration enhancement strategy with maximum chemical oxygen demand(COD)removal of?65.2%.Via direct comparison,the power generation and COD removal capability of the microalgal-fed MFC was close to that of the commercial acetate-fed MFC.The microalgae-fed MFCs presented superior electrochemical characteristics that were attributed to the complicated composition of the biomass anolyte.It possessed a multiple anode respiring bacterial group and diverse microbial community.The two-chambered MFCs fed with acetate co-substrates was used to increase the bacterial electrochemical activities and detoxifying the MC-LR for anode biofilm,resulting in a significant increase of bioelectricity production.Compared to MFCs treated with only200mg/L of cyanobacteria biomass,the maximum power density generation increased by 1082.6%for MFCs treated with Cyanobacteria+3mM as electron donor and based on polarization test it has increased by 363.3%.The electric cyclic terms were ideally increased along with the augmentation of the acetate,In comparison to 6 mM acetate alone,the electric cyclic terms for MFCs treated with cyanobacteria+6mM were 12.7%extended and the power densities were 6.3%increased and the calculated colombic efficiencies(CE)were 35.87%higher;which all supported that M.aeruginosa biomass had successfully worked as electrons donor for the anode-biofilm.This study provides new strategies for the utilization of microalgal and cyanobacterial biomasses as bioresources and proposed the strategies which can be applied as low cost waste water treatment system.