Enhancing Biogas Production Using Mixtures of Manures

Abstract

Abstract This study aims at enhancing the production of biogas through the use of a mixture of organic manures. We used biogas digester consists of plastic polyethylene tank of 250 Liter capacity, is purchased from local market three digester tank were fabricated from local market. Three digester tank were fabricated and design as in fig (3.1) which consist of inlet and outlet. The mixtures of manure added to digester through inlet, and mixed well by wood stick for ten minutes. the output in the bottom of digester to take a samples for analysis , and to empty the digester content of slurry after finishing of digestion process. A mixture of cow and chicken manure was prepared using a digestive and fermented for 30 days at a temperature of 39◦c. The organic substance rate was 10% of the mixture's volume after adding water. It was noted that the removal ratio of COD, BOD, TS, VS, Fc from the substrates respectively where COD is (46%, 21%, 55%), BOD is (32%, 22%, 44%), TS is (83%,96%, 90%) , VS is (90%, 93%, 77%),FC is (99.5%, 99%, 99%). The study shows that the amount of biogas produced from the mixture of cow and chicken manures is much higher than the amount produced from each manure individually. The study also shows a positive effect of bio-manures on the growth and production of plants. The study recommended the using of amixtures of several organic substances to increase the production of biogas of several mixtures of organic substances to increase the production of biogas . Key Words: Biogas, Cow Manure, chicken Manure, Fertilizers