Suggest a safe and efficient method for the disposal of bio wastes and sewage materials. How is this method advantageous to us?

Biogas is a safe and efficient method for the disposal of bio wastes and sewage materials. In a biogas plant all the organic wastes such as cow dunk, plant wastes or the residue of any crop is used as a fuel for the production of biogas. Other waste products such as kitchen waste is also used. Hence, all waste is being disposed and converted into biogas.