Describe how biogas is generated from activated sludge. List the components of biogas.

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Solution

Dung and other organic wastes are converted into a slurry with 90% water. It is passed on to digester. Facultative anaerobic decomposers change the complex organic substances into simpler ones called monomers. The monomers undergo acidification with the help of fermenting microbes. The various products are changed into methane by methanogens. The biogas thus formed collects in floating gas holder for supply. Spent slurry is collected as sludge for use as manure.

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(b) Sludge
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(d) Aerator

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(a) What is biogas ? Name the major component of biogas.
(b) What are the raw materials used for making biogas ?
(c) Describe the construction and working of a biogas plant with the help of a labelled diagram.
(d) Write any two uses of biogas.
(e) Write any two advantages of using biogas.

Q. The waste sludge formed in biogas plants can be used as a biofertilizer.

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(a) sludge
(b) scum
(c) biogas
(d) sewer

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