This study investigated the solid – liquid dilution ratio at which composite cow, pig and poultry wastes would produce biogas during anaerobic digestion at mesophillic temperature. Three digesters A, B and C, each of 5 Litres capacity were used. Each was fed with 3.9 Kg of prepared slurry at dilution ratios of 5, 15 and 25% total solid concentration respectively. Digester C with 25% total solid concentration produced highest amount of biogas (total of 1.6 Litres) over a period of 26 days, while digesters A and B with 5 and 15% produced 0.1 and 0.15 Litres respectively. It was observed that biogas generation stopped in digesters A and B after the second day of the study when the solid matters had settled out of the slurries The heat generated during gas production, was noted to be responsible for increase in temperature as gas generation was progressing in C until the twenty-sixth day, after which the temperature inside the digester started reducing to equilibrate with ambient temperature. It was concluded therefore, that the dilution ratio less than 25% total solid concentration of combined cow, pig and poultry wastes is a high dilution ratio that will not generate biogas as a result of solid matter that will get separated out of the slurry.
PAPER TITLE :BIOGAS GENERATION FROM THREE ANIMAL COMPOSITE WASTES AT MESOPHILLIC TEMPERATURE
JOURNAL Of SUSTAINABLE TECHNOLOGY | VOLUME 2 NUMBER 1 2011
- Author(s) : 1FAMUREWA, J.A.V. and BABATOLA, J. O