This article describes how the popular fixed-dome type family size biogas plant has been successfully modified to allow use of fresh undiluted cattle dung as substrate. A large number of family-size biogas plants installed in the countryside in India use cattle dung diluted with an equal quantity of water as substrate. The biogas plant described below requires very little or no water for mixing with the cattle dung, and generates about 50% more biogas.
SHYAM, M. (2001): A biogas plant for the digestion of fresh undiluted cattle dung. In: Boiling Point: Volume 47 , 33-35.