Grape Waste Could Make Competitive Biofuel
September 2, 2015http://phys.org/news/2015-08-grape-competitive-biofuel.html#jCp
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Researchers from the University of Adelaide have found that solid waste from wine-making could make a competitive biofuel.
The researchers showed that up to 400 liters of bioethanol could be produced by fermenting of a ton of grape marc which are the skins, stalks and seeds left during wine-making. Global wine production leaves an estimated 13 million tons of grape marc waste each year.
PhD candidate Kendall Corbin analyzed the composition of grape marc from two grape varieties, cabernet sauvignon and sauvignon blanc. Corbin found that majority of the carbohydrates found in grape marc could be converted directly to ethanol through fermentation.
The leftover product was also suitable for use as an animal feed or fertilizer. Ethanol yields could be increased by pre-treatment with acid and enzymes.
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