Study New Way to Convert Household Waste Into Biogas

Study New Way to Convert Household Waste Into Biogas

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Part of #Study New Way to Convert Household Waste Into Biogas# :

Publishing year : 2011

Conference : Second biomass congress of Iran (biomass and biogas)

Number of pages : 9

Abstract: Anaerobic digestion process is one of the alternative methods for converting organic waste into methane gas which is a fuel and energy source. The activities of various types of microorganisms are the main factor for anaerobic digestion which produces methane gas. Therefore, in this study, a modified Anaerobic Baffled Reactor with a working volume of 50 liters was designed to identify microorganisms through biogas production. The mixture of 75% Household waste and 25% sewage sludge was used as a substrate. Observations in microorganisms in the Anaerobic Baffled Reactor showed that there is a small amount of protozoa (5%) and fungi (2%) in the system, but almost 93% of the microorganism population consists of bacteria. It is definitely clear that bacteria are responsible for anaerobic biodegradation of Household Waste. Results show that in the acidification zone of the Anaerobic Baffled Reactor, the fast growing bacteria, able to grow at high substrate levels and dominated by reduced pH, were fast growing bacteria. A shift to a slower growing scavenging bacteria that grows better at higher pHs occurring towards the end of the reactor. Due to the ability of activity in acetate environment, the percentages of Methanococcus, Methanosarcina and Methanotrix were higher than other types of methane former in the system.