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Acta Sci Pol Technol Aliment

Title:		Reduction of water consumption in bioethanol production from triticale by recycling the stillage liquid phase
Author(s):		Gumienna M; Lasik M; Szambelan K; Czarnecki Z;
Address:		"Department of Food Science and Nutrition, Poznan University of Life Sciences, Poznan, Poland. gumienna@up.poznan.pl"
Journal Title:		Acta Sci Pol Technol Aliment
Year:		2011
Volume:		10
Issue:		4
Page Number:		467 - 474
DOI:
ISSN/ISBN:		1898-9594 (Electronic) 1644-0730 (Linking)
Abstract:		"BACKGROUND: The distillery stillage is a major and arduous byproduct generated during ethanol production in distilleries. The aim of this study was to evaluate the possibility of the stillage recirculation in the mashing process of triticale for non-byproducts production and reducing the fresh water consumption. The number of recirculation cycles which can be applied without disturbances in the ethanol fermentation process was investigated. MATERIAL AND METHODS: Winter triticale BOGO and 'Ethanol Red' Saccharomyces cerevisiae yeast were used in the experiments. The method of non-pressure cooking was used for gelatinizingthe triticale, commercial alpha-amylase SPEZYME ETHYL and glucoamylase FERMENZYME L-400 were applied for starch liquefaction and saccharification. The process was conducted at 30 degrees C for 72 h, next after distillation the stillage was centrifuged and the liquid fraction was used instead of 75% of process water. RESULTS: Ethanol yield from triticale fermentations during 40 cycles ranged between 82% and 95% of theoretical yield preserving yeast vitality and quantity on the same level. The obtained distillates were characterized with enhanced volatile compounds (fusel oil, esters, aldehydes, methanol) as well as protein and potassium concentrations. CONCLUSIONS: The liquid part of stillage was proved that can be reused instead of water in bioethanol production from triticale, without disturbing the fermentation process. This investigated solution of distillery byproducts utilization (liquid phase of stillage) constitutes the way which could significantly decrease the bioethanol production costs by reducing the water consumption, as well as wastewater production"
Keywords:		"Alcohols/analysis Aldehydes/analysis Biotechnology Distillation Edible Grain/*metabolism Esters/analysis Ethanol/*metabolism *Fermentation Glucan 1, 4-alpha-Glucosidase/metabolism Methanol/analysis Saccharomyces cerevisiae/metabolism Starch/metabolism Vola;"
Notes:		"MedlineGumienna, Malgorzata Lasik, Malgorzata Szambelan, Katarzyna Czarnecki, Zbigniew eng Poland 2012/01/11 Acta Sci Pol Technol Aliment. 2011 Oct-Dec; 10(4):467-74"