Biogas is commonly made from animal slurry, sludge settled from wastewater and at
landfills containing organic wastes. However, biogas can also be made from almost
any organic waste has the ability to produce biogas: human excreta, slurry, animal
slurry, fruit and vegetable waste, slaughterhouse waste, meat packing waste, dairy
factory waste, brewery and distillery waste, etc. Fiber rich wastes like wood, leaves,
etc. make poor feed stocks for digesters as they are difficult to digest. Many
wastewaters contain organic compounds that may be converted to biogas including
municipal wastewater, food processing wastewater and many industrial
wastewaters. Solid and semi-solid materials that include plant or animal matter can
be converted to biogas.