4. Applications of biogas
Biogas can be used for different purposes i.e. for the production
of heat and electricity (cogeneration), heat only, electricity only, bio methane up gradation for gas grid, fuel for vehicles, high tech
process energy and in chemical industry as a raw material [57–59].
Biogas has many advantages for the producer, society and the
environment because it doesn’t contribute to global warming. The
wastes used as feeding material decrease risk of diseases and
become useful after being processed in the digester i.e. animal
waste become a good fertilizer after being handled in biogas plant
[59]. Carbon dioxide released from biogas can be used by plant for
the process of photosynthesis; hence the production of carbon
dioxide is again used for the formation of organic compound in
plants [60].