Methane and fertilizers from corn distiller's grains
A new agricultural utilization research project shows that dilute lees left from the ethanol production process, soluble jade primary solids, and anaerobic digestion methods to produce methane and fertilizer are feasible. A demonstration project tested distiller's grains and distillers' grains at the Fogus Falls municipal sewage treatment plant. Ethanol plants may become energy independent as long as the energy in the distillers' grains is extracted to become methane. David Wyin, of Morhard City, Minnesota, USA, estimated that this could potentially add $10 million to a 50-million-plus ethanol plant.
Anaerobic digestion process is now used by many agricultural product processing industries and municipal government water treatment plants. The beet processing industry uses this process to digest its wastewater and run its dryer with methane. Some ethanol plants use small digesters (called methanators) to clean their wastewater, but the ethanol industry does not currently use the digestion process to produce power.
Distiller's grains are maize solids, aqueous paddles that have been fermented from corn starch. The ethanol plant separates the entire lees into distiller's slag and dilute lees. The by-products of these ethanol contain a considerable amount of energy that can occur in the form of biogas. A full-scale demonstration project at the Fogus Falls Wastewater Treatment Plant, where the entire distillers' grain of the ethanol plant was added to the anaerobic digester, was very successful. The biogas produced by anaerobic digesters is sufficient to meet the plant's fuel needs.
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