Abstract: The large number of tofu industries spread in many cities in Indonesia produces a lot of liquid and solid waste. Tofu industrial wastewater is known to contain high COD so it must be processed before being disposed of into the environment. This research studies the reduction of tofu liquid waste COD and uses it as a power plant using the Microbial Fuel Cell (MFC) system. In addition, MFC technology is combined with developing spirulina at the cathode. The results showed that electricity amounted to 171.44mW.m-2 for 1 electrode and 171.44mW.m-2 for 2 electrodes. The percentage of reduction in COD of tofu liquid waste reached 40% and OD of spirulina biomass reached 0.5.

Keywords: Tofu Wastewater; Spirulina; Electricity generation; COD removal

| DOI: 10.17148/IARJSET.2019.6706