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  4. The residue left after methane production from cattle dung is

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Q. The residue left after methane production from cattle dung is

Microbes in Human Welfare

Solution:

Biogas is a methane rich fuel gas produced by anaerobic breakdown or digestion of biomass with the help of methanogenic bacteria. Biogas is made up of methane $(50-70\%)$, carbon dioxide $(30-40\%)$ with traces of nitrogen, hydrogen sulphide and hydrogen. The effluent and residue left after the fermentative generation of biogas is rich in minerals, lignin and a part of cellulose. It is an ideal manure