COMPARATIVE STUDIES OF THE PRODUCTION OF BIOGAS FROM CATTLE DUNG AND CATTLE ABDOMINAL WASTE

摘要

The purpose of this study is to determine the rate of biogas production from cattle dung and cattleabdominal wastes, with a view to knowing the best for biogas yield. The two different wastes used for the work wereobtained fresh from Sokoto abattoir in Sokoto State of Nigeria. The wastes were respectively collected in cleanpolythene bags. The apparatus used comprise of pairs of 250cm~3 conical flask, two hole rubber cork, measuringcylinder, thermometer, delivery tube, trough of water, beam balance, nutrient agar, autoclave, incubator and gramstaining reagents. Two conical flasks of size 250cm~3 were thoroughly washed and allowed to dry in an oven at110°C. 100/g of each organic waste was mixed with distilled water to form slurries; the flasks were labeled fordistinction. The two different wastes were subjected to the same anaerobic fermentation in the laboratory and theirrates of biogas production were monitored using graduated inverted cylinders. The daily production of biogas fromthe wastes was studied. The results show that the cattle abdominal waste produced biogas faster than the cattle dungbut the cattle dung gave a higher volume of biogas than the cattle abdominal waste. Microbiological analysis of thefresh wastes using standard microbiological methods reveals that the cattle dung contains Methanococcus bacteriawhile the cattle abdominal waste contains Methanobacillus bacteria and Methanococcus spp. In conclusion, the studyshowed that cattle dung is a better organic waste for biogas production than the cattle abdominal waste.