The fuel obtained by decomposing sludge is:

biogas

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petrol

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diesel

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kerosene

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Solution

The correct option is A biogas
The gas obtained by decomposing sludge is Biogas (methane and carbon dioxide). Decomposition of sludge products methane and carbon dioxide which is then stored and supplied as biogas for various household processes and other commercial processes.

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Sludge in separate tanks is decomposed to get biogas by

Activated sludge is obtained after aeration, settling and filtration using sand beds. Choose the options that are true regarding activated sludge.

	Primary Sludge	Activated sludge
(i)	It is sludge formed during primary sewage treatment.	It is sludge formed during secondary sewage treatment.
(ii)	It possesses flocs of decomposer microbes.	It does not possess flocs of decomposer microbes.
(iii)	It does not require aeration.	Formation of activated sludge requires aeration.
(iv)	A lot of decomposition occurs during formation of primary sludge.	Very little decomposition occurs during formation of activated sludge.

k g / m^{3}

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