Biogas digesters and septic tanks in rural areas which utility
Biogas can be used as gas. Septic tank. See you also do not sow.
The biogas liquid fertility than many septic feiligao,
Personally feel that if biogas digesters in rural areas than in the septic tank is useful, because not only produces biogas digesters (can cook, lighting etc.) and biogas residue and biogas slurry can also be used as a good fertilizer
