The use of cattle dung to generate biogas is well known in Asia, especially in the Indian subcontinent.
The body of the digester is a round tank, with a volume of several cubic metres and is sunk in a pit in the ground. The inlet to the tank has a rotator, which is used to mix cow dung and water. The slurry of dung and water ferments in the tank, and the pressure of the biogas produced pushes the slurry out of one end. The gas is piped from the top of the tank to a biogas cooking stove.

Recently Sunlabob has constructed a Biogas-digester in Ban Sorg/Laos. For further application of biogas technology in Laos, Sunlabob intends to explore the reactions of villagers to this technology which allows to reduce fire wood for cooking and increases health due to avoidance of smoke.