International Journal of Innovative Scientific & Engineering Technologies Research 3(2):52-64, April-June 2015


SEAHI PUBLICATIONS, 2015

PRODUCTION OF BIOGAS FROM KITCHEN WASTE AND COW DUNG



ADIOTOMRE, K.O1. & UKRAKPOR E. F.2
1Department of Chemical Engineering, Delta State University, Abraka, Nigeria
2Department of Mechanical Engineering Delta State University, Abraka, Nigeria
E-mail: 1oadiosking@yahoo.com, ukrakporf@gmail.com2

ABSTRACT
Biogas is a mixture of colorless, flammable gases obtained by the anaerobic digestion of organic waste materials. It is an alternative source of energy. The major composition of biogas is methane (CH4) 50-70%. It can be used for cooking and power generation, while the residues from the process are used as fertilizers. In this experimental work, an equal ratio of 2.5kg kitchen waste and 2.5kg water with small amount (1.75kg) of cow dung was weighted. The 1.75kg of cow dung was mixed with 1.5kg of water fed into 13.5 liter constructed digester and after some days, 2.5kg kitchen waste was mixed with 1kg of water and also fed into the digester. Then allowed to ferment for period of 22 days and a pressure range of 0psi-70.5psi was obtained. A graph of pressure (psi) against time (hrs), volume (liters) against time (hrs) and Pressure (psi) against volume (liters) of gas shows increase in pressure (psi) with time (hrs) and an increase in pressure with decrease in volume. A combustion test was also carried out which showed that for every 1 minute the temperature of water increases. The result from analysis of biogas composition done revealed the following: CH4 (67.58%), H2 (5.16%), CO2 (20.29%), N2 (8.46%), O2 (1.06%) and H2S (2.36%) which has proved that really kitchen waste is a good raw material for production of biogas.
Keywords: Biogas, Kitchen waste, Cow dung, Anaerobic digestion.