What are the two useful substances which are produced by the treatment of sewage.State their uses
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after treatment of sewage, slurry and methane gas are the most useful substances formed. slurry can be used as an organic fertilizer while methane gas is used as a fuel.
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Biogas and manure. The biogas can be used as a fuel or can be used to produce electricity. Manure is used
in agriculture as a fertiliser.
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