Abstract
The effect of varying the organic loading rate in the digester volume using a mixture of poultry droppings and cow dung as biomass was studied. The study was aimed at determining the optimum organic loading rates, which would produce the maximum volume of biogas from a mixture of poultry droppings and cow dung. The pH was maintained between 6.8 and 7.2. All other parameters affecting the production of gas were kept constant except the organic loading rate. The wastes, poultry droppings and cow dung was mixed in the ratio 60:40 and maintained at a sludge concentration of 700g/l. It was observed that biogas produced from the digester with the organic loading rate of 2.8 kg vs/m3/day gives the highest proportion of methane and the digester with organic loading rate of 3.2 kg vs/m3/day produced the highest proportion of carbon dioxide.
Highlights
Energy is the soul of motion without which everything will stand still
The materials that were used for the study included swine wastes and cow dung, poultry droppings, block polyethene bags, retort stands, cans used as digesters, conical flasks, measuring cylinders, glass and rubber tubing
Poultry droppings had a higher volatile solid content compared to cow dung with a volatile solid content of 68.40 %
Summary
Energy comes in various forms and is present in most matters. Out of these substances is fuel which is a combustible matter that could be converted to power or heat. Sources of fuel include coal, wood, oil and gas. Crude oil has been the only source of energy serving at least 60% of the world energy demand to date (Loftness, 1984). The increasing number of industries and energy-consuming lots have brought about high demand for crude oil. Millions of cubic yards of associated and non-associated gas are flared away every day all over the world in the course of tapping crude oil. With the use of high technology, associated gases are liquefied and stored for use
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