Biogas is generating methane gas by anaerobic fermentation of biomass such as kitchen waste, cattle dung and farm waste.
Biogas can be used for cooking, electricity generation and also for thermal use (running boilers etc. for steam generation).
The bio gas slurry is an excellent manure with high NPK value which is in a form the plants can directly intake.
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Some books are also available on the subjects
one book is Biogas Technology by TP ojha and published by jain brothers you can get good information about biogas from this book.