Biogas Production from Tofu Processing Waste and Corncobs with the Addition of Clam Shell Lime

Tofu production process waste has the potential to become raw material in producing biogas because its organic components, but it has a very low pH, which is not suitable for biogas production. Therefore, it is necessary to increase the pH and maintain it to be neutral during fermentation. The number of treatments given were two treatments. The first treatment by adding 3% of NaOH and the second treatment by adding clam shell lime as much as 3 levels (6%, 7% and 8%). From the research, it was found that the highest value of parameters tested was found in the treatment of adding clam shell lime as much as 6% which produced biogas as much as 1633.33 ml with a pressure of 1.0184 bar. The biogas production rate was 842 ml /day. After the combustion test, the resulting flame was blue and can burn for 38.63 seconds.