The PolyBiogas is a contentious digestion system commercially sold in Kenya. It's development was financed by IFAD (International Fund for Agricultural Development) and implemented by Cypro East Africa. It's development goes back into 2012. Cypro approached Polytanks Ltd, manufacturer of HDPE products to develop a biogas digester.
The biogas system uses a 1 m³ AD tank combined with and gas storage tank of 0.35 m³. The inlet and outlet tank is designed as a displacement tank. Both displacement tanks are above the water line making it possible to slightly pasteurize the gas. the digester is designed for being partly below ground.
The recommended feeding rate is about 10kg dung per day mixed with 10 litres of water.Download: PolyBiogas PTB1500