ANAEROBIC DIGESTION

摘要

PURPOSE:To improve anaerobic digestion efficiency by working bacteria strain having excellent organic substance-decomposing function in acid fermentation process as major bacteria strain. CONSTITUTION:Organic waste is made soluble by acid fermentation using Clorstridium bifermentans as major bacteria strain which converts >=10% of organic substances in a culture into volatile fatty acids with 2-6 of the number of carbon and produces acetic acid >=80wt.% of the total of the fatty acids and a fermentation gas containing >=10vol.% of hydrogen during 2 days anaerobic culture at 37 deg.C in PYG culture fluid and then methane fermentation is carried out using methane bacteria. This solubilizing bacterial solubilizes organic substances at high efficiency and produces acetic acid and hydrogen at extremely high ratio. As a result, organic substances are decomposed efficiently and a gas containing methane in high concentration is obtained.