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Microalgae-Microbial Fuel Cells (MMFCs) are very popular to be used to treat organic waste. MMFCs can function as an energy-producing wastewater pre-treatment system. Wastewater can provide an adequate supply of nutrients, support the large capacity of biofuel production, and can be integrated with existing wastewater treatment infrastructure. The reduced content of Chemical Oxygen Demand (COD) is one way to measure the efficiency of wastewater treatment. MMFCs reactors are made in the form of two chambers (anode and cathode) both of which are connected by a salt bridge. Tofu wastewater as an anode and  Spirulina sp  as a cathode. To improve MFCs performance which is to obtain maximum COD removal and electricity generation, nutrient NaHCO 3  as the nutrient carbon source for  Spirulina sp  was varied. The system running phase on 12 days. The results were  Spirulina sp  treated with MFCs technology has better growth than non-MFCs. The MMFC generated a maximum power density of 21.728 mW/cm 2  and achieved 57.37% COD removal. These results showed that the combined process was effective in treating tofu wastewater.

Bioelectricity production from tofu wastewater using microbial fuel cells with microalgae Spirulina sp as catholyte