Fermentation of unhydrolyzed potato waste to ethanol by cocultures of Aspergillus niger and Saccharomyces cerevisiae was investigated at different temperatures (20°C to 50°C) and at different pH (4 to 7). Fermentation was done for 7 days for potato waste and the ethanol content was measured every 24 hours. The optimum pH and temperature for the fermentation of waste potatoes was found 6 and 30°C. With the optimized pH and temperature, fermentation was then carried out at different yeast concentration 3% to 12%. With the change in the concentration of yeast, the time required for the completion of fermentation decreased dramatically. Using a 12%, 9%, 6%, 3% yeast inoculum, maximum ethanol production was completely achieved in 2, 3, 5, 7 days respectively. The maximum ethanol yield from waste potatoes was 12.124%. Aspergillus niger strain B gave a higher production of ethanol. The amount of ethanol content increased with the increase in fermentation time.
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[Sanat Rath, Ajay Kumar Singh, Harison Masih1, Yashab Kumar, Jyotsna Kiran Peter, Pankaj singh Santosh Kumar Mishra (2014); Bioethanol production from waste potatoes as an environmental waste management and sustainable energy by using cocultures Aspergillus niger and Saccharomyces cerevisiae Int. J. of Adv. Res. 2 (4). 0] (ISSN 2320-5407). www.journalijar.com
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