SUBJECT: BASIC TECHNOLOGY
TERM: 3RD TERM
TOPIC: ENERGY SOURCES- BIOGAS PRODUCTION
Cooking gas used as domestic fuel is a liquidified-petroleum gas (LPG) from oil refineries. This is main source of our cooking gas. However, it is possible to get cooking gas from other sources. One of such sources is biogas.
Biogas is produced from the fermentation of animal wastes by bacteria in an oxygen-free atmosphere. The wastes, which can be used to produce biogas, are human excretion, dungs (from cow, goat, sheep and pigs), poultry dropping, urban refuse, and agricultural wastes. The process of releasing gas fuel by bacterial digestion of wastes is scientifically referred to as biosynthesis. Hence, the gas released from the process is called biogas.
The Production of Biogas from Wastes.
Biogas plant consists of two parts namely:
The digester contains the wastes to be digested. The waste is mixed properly into slurry, and then fed into the digester through the waste inlet. The waste is then left in the digester to ferment from a period ranging from 7-14 days. As a result of fermentation, biogas is released, and collected in the floating storage tank which floats in the digester.
As fermentation progresses, more gas is released and collected in the floating storage tank. The gas rises up in the digester as the gas pressure increases. The biogas flows out under its own pressure through the gas outlet. If such a digester is situated at the back of a kitchen, biogas is connected directly to the gas stove to be used as cooking gas.
Read “RENEWABLE ENERGY –BIOGAS”
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