why is biogas is a better fuel than animal dung cakes?
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Cow dung cake has low calorific value i.e. 3.1kJ/g than the Methane gas (5.5kJ/g), a biogas constituent. 2.Bio gas is a clean fuel that burns without smoke and leaves no ash, unlike cow dung. 3.The by-product os biogas plants i.e. the spent slurry, being rich in nitrogen and phosphorus is a good manure.
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As it is renewable source of energy so it is considered as a good fuel. Further it burns without producing smoke and hence does not cause air pollution. Also it has a high calorific value over animal dung.
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