The document explains the process of anaerobic fermentation in a digester, where a slurry made of animal dung and water is used to produce bio-gas over a two-month period. It highlights the role of anaerobic microorganisms in this process and the collection of bio-gas in a dome. Additionally, it emphasizes the importance of land and soil as essential resources for providing various biological materials.

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50. Slurry (animal dung + water) is fed into the digester
through the inlet chamber. The slurry, in the digester, is left
for about two months for fermentation. Anaerobic micro-
organisms are responsible for this action. As a result of
anaerobic fermentation, bio-gas is collected in the dome.
When sufficient amount of bio-gas is collected in the
dome, it exerts a large pressure on the slurry and this in turn
forces the spent slurry to the over flow tank through the outlet
chamber.

52. Land is the most important and valuable resources for
mankind as it provides food, fibre, wood, medicine and other
biological materials needed for food. Soil is the mixture of
inorganic at erials (rocks and minerals) and organic materials
(dead animals and plants).
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