Enhanced electricity generation by using algae biomass and activated sludge in microbial fuel cell

Abstract

Recently, interest is growing to explore low-cost and sustainable means of energy production. In this study, we have exploited the potential of sustainable energy production from wastes. Activated sludge and algae biomass are used as substrates in microbial fuel cell (MFC) to produce electricity. Activated sludge is used at anode as inoculum and nutrient source. Various concentrations (1–5g/L) of dry algae biomass are tested. Among tested concentrations, 5g/L (5000mg COD/L) produced the highest voltage of 0.89V and power density of 1.78W/m2 under 1000Ω electric resistance. Pre-treated algae biomass and activated sludge are also used at anode. They give low power output than without pre-treatment. Spent algae biomass is tested to replace whole (before oil extraction) algae biomass as a substrate, but it gives low power output. This work has proved the concept of using algae biomass in MFC for high energy output.