Digester 1400329 222621064 2008-06-30T08:46:19Z Mac 7858 A '''digester''' is a device used in [[papermaking]] which takes small [[wood]] chips, and cooks them for a number of hours, to remove [[lignin]]. The softer chips are then passed on to a machine that [[Bleach|bleaches]] them to the desired degree of whiteness. An [[anaerobic digester]] is an anaerobic [[bioreactor]] used to harvest [[biogas]], a gas largely comprised of methane to supplement conventional energy sources, from organic waste. These digesters, or biodigesters, are made in various ways, using a wide variety of organic materials available (cattle manure, human feces, or plant-based waste). The style of biodigester depends largely on the building materials and waste products available to the user, as well as the energy needs he/she may have. [[category: papermaking]] {{tech-stub}} [[fr:Digesteur]]