The residue left after methane production from cattle dung is\

Question

Professor PC Thomas Classes · Answer

(c) : 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.