3 in 1 biogas digester - pigsty + latrine + digester

A slightly more elaborate model is the “three-in-one,” which includes a pigsty and latrine connected directly to the digester tank. In warmer regions, the fertilizer can be applied on an orchard in the “pig-biogas-fruit” model.

 More info: http://www.ecotippingpoints.org/our-stories/indepth/china-biogas.html 

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