Biogas generation from leafy biomass & vegetable wastes by application of ultrasound

Generation of biogas using biomethanation process from various bio-wastes is well known. This is a slow process but can be accelerated by applying ultrasound. In this respect extensive experimental studies in laboratory scale and pilot scale reactors were conducted, using cowdung and leafy biomass/ vegetable wastes with different dilution from 1:1 to 1:10. Ultrasound frequency was 43 kHz from a constant frequency ultrasound generator. It was observed that with the application of ultrasound for a few minutes everyday, the gas generation rate was nearly doubled compared to that in the conventional process. The start-up time for gas generation also reduced substantially.