Abstract：
:The effects of acid protease and urea addition during the fermentation step were evaluated. The fermentations were also tested with and without the addition of urea to determine if protease altered the nitrogen requirements of the yeast. Results show that the addition of the protease had a statistically significant effect on the fermentation rate and yield. Fermentation rates and yields were improved with the addition of the protease over the corresponding controls without protease. Protease addition either with or with added urea resulted in a higher final ethanol yield than without the protease addition. Urea addition levels >1200 ppm of supplemental nitrogen inhibited ethanol production. The economic effects of the protease addition were evaluated by using process engineering and economic models developed at the Eastern Regional Research Center. The decrease in overall processing costs from protease addition was as high as $0.01/L (4 ¢/gal) of denatured ethanol produced.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Johnston DB,McAloon AJdoi
10.1016/j.biortech.2013.11.043subject
Has Abstractpub_date
2014-02-01 00:00:00pages
18-25eissn
0960-8524issn
1873-2976pii
S0960-8524(13)01759-8journal_volume
154pub_type
杂志文章abstract：:Temperature is an important environmental variable that can strongly affect the performance of anaerobic reactors working at ambient temperatures. This study presents a mechanistic mathematical model which depends in an explicit way on the operating temperature. The cardinal temperature model function is proposed to d...
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