Digester
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2008-06-30T08:46:19Z
Mac
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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]]
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[[fr:Digesteur]]