Effect of Biomass Composition and Operation Condition on Methane Yield from Anaerobic Digestion

Abstract

The amount of biomass waste is rapidly increasing worldwide. Besides, the energy demand is also increasing. Utilities biomass for production of biogas is one of the most promising methods for producing energy renewable resource. This project aims at investigating yield and composition of produced biogas produced from anaerobic digestion for single feed stock (cow manure, fruits and vegetables waste) and combined feed stock. Samples of biomass were collected from different sources, and their properties including pH, TS, moisture content and VS were measured. The result showed optimum values for characterization test of biomass samples. Digestion process will proceeded under mesophilic condition by using batch bioreactor. For each biomass two vessels were used, first one for digestion process and the second for collect produced biogas. Water displacement method, BIOGAS 5000 device were adopted to determine the yield of biogas and its composition respectively. Biogas composition were not satisfying where the highest percent methane is only 4% of fruit and vegetable due to acidic ambient which hardly affects methanogenic bacteria, 30% of cow manure due to leakage in reactor body and 1% of co-digestion because oxygen and pH value were the main reasons for inhibition of the anaerobic digestion process.