The Effect of the Tuning Parameters on the Performance of the Parametric and Nonparametric Model Based Control Methods for Growth Medium Temperature of Baker's Yeast Production

2001 ◽  
Vol 79 (4) ◽  
pp. 242-249 ◽  
Author(s):  
N. Bursali ◽  
S. Ertunc ◽  
B. Akay ◽  
V. Pamuk ◽  
H. Hapoğlu ◽  
...  
Keyword(s):  
Growth Medium ◽  
Baker’S Yeast ◽  
Nonparametric Model ◽  
Control Methods ◽  
Baker's Yeast ◽  
Medium Temperature ◽  
Model Based Control ◽  
Tuning Parameters ◽  
Model Based ◽  
Yeast Production

Valorization of residual soft drinks by baker's yeast production and insight for dairy wastewater whey incorporation

2019 ◽  
Vol 79 (4) ◽  
pp. 635-644
Author(s):  
Mariam Kasmi ◽  
Amjad Kallel ◽  
Lobna Elleuch ◽  
Moktar Hamdi ◽  
Ismail Trabelsi
Keyword(s):  
Growth Medium ◽  
Soft Drink ◽  
Soft Drinks ◽  
Baker’S Yeast ◽  
Dairy Wastewater ◽  
Partial Substitution ◽  
Growth Media ◽  
Baker's Yeast ◽  
Conversion Rates ◽  
Yeast Production

Abstract Residuals are responsible for the polluting load increase of soft drink industry wastewater due to their high sugar contents. The present work proposes an upstream segregation of residuals to be biologically treated by the bioconversion of their carbohydrates content into baker's yeast biomass. Carbonated soft drinks (CSD) and nectars and juices (NJ) ranges were considered. Different incorporation ratios of NJ in the CSD (0–75%) have been investigated for balanced growth medium. Despite the nitrogen deficiency of media, results showed that NJ incorporation promoted the microbial growth. Media containing more than 50% of NJ exhibited ∼25% sugar-biomass conversion rates. The chemical oxygen demand (COD) of the media exceeded 70% at the end of fermentation. Moreover, valuable components were recovered by yeast production. Nutrient consumption rates varied from 65.4% for sugar and calcium content to in excess of 99% for protein and other minerals. In order to investigate an available and low-cost source of nitrogen for yeast production, partial substitution of the soft drink growth medium by bactofugate whey was evaluated. The soft drink-whey mixture medium fermentation resulted in 63% COD removal rate after 28 h. Meanwhile, the biomass production yield revealed an improvement of about 25% compared to the balanced soft drink medium (NJ50).

Changes in Gene Expression of Commercial Baker's Yeast during an Air-Drying Process that Simulates Dried Yeast Production

2008 ◽  
Vol 106 (4) ◽  
pp. 405-408 ◽  
Author(s):  
Toshihide Nakamura ◽  
Satomi Mizukami-Murata ◽  
Akira Ando ◽  
Yoshinori Murata ◽  
Hiroshi Takagi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Drying Process ◽  
Air Drying ◽  
Yeast Production

Real-time fuzzy-knowledge-based control of Baker's yeast production

1995 ◽  
Vol 45 (2) ◽  
pp. 135-143 ◽  
Author(s):  
Terhi Siimes ◽  
Pekka Linko ◽  
Camilla von Numers ◽  
Mikio Nakajima ◽  
Isao Endo
Keyword(s):  
Real Time ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Knowledge Based ◽  
Yeast Production ◽  
Fuzzy Knowledge

scholarly journals Predicting By-Product Gradients of Baker’s Yeast Production at Industrial Scale: A Practical Simulation Approach

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1554
Author(s):  
Christopher Sarkizi Shams Hajian ◽  
Cees Haringa ◽  
Henk Noorman ◽  
Ralf Takors
Keyword(s):  
Carbon Dioxide ◽  
Baker’S Yeast ◽  
Overflow Metabolism ◽  
Baker's Yeast ◽  
Biochemical Engineering ◽  
Dissolved Carbon ◽  
Operation Conditions ◽  
Yeast Production ◽  
Scale Down ◽  
Carbon Dioxide Levels

Scaling up bioprocesses is one of the most crucial steps in the commercialization of bioproducts. While it is known that concentration and shear rate gradients occur at larger scales, it is often too risky, if feasible at all, to conduct validation experiments at such scales. Using computational fluid dynamics equipped with mechanistic biochemical engineering knowledge of the process, it is possible to simulate such gradients. In this work, concentration profiles for the by-products of baker’s yeast production are investigated. By applying a mechanistic black-box model, concentration heterogeneities for oxygen, glucose, ethanol, and carbon dioxide are evaluated. The results suggest that, although at low concentrations, ethanol is consumed in more than 90% of the tank volume, which prevents cell starvation, even when glucose is virtually depleted. Moreover, long exposure to high dissolved carbon dioxide levels is predicted. Two biomass concentrations, i.e., 10 and 25 g/L, are considered where, in the former, ethanol production is solely because of overflow metabolism while, in the latter, 10% of the ethanol formation is due to dissolved oxygen limitation. This method facilitates the prediction of the living conditions of the microorganism and its utilization to address the limitations via change of strain or bioreactor design or operation conditions. The outcome can also be of value to design a representative scale-down reactor to facilitate strain studies.

Integrated biological (anaerobic–aerobic) and physico-chemical treatment of baker's yeast wastewater

2005 ◽  
Vol 52 (10-11) ◽  
pp. 273-280 ◽  
Author(s):  
S. Kalyuzhnyi ◽  
M. Gladchenko ◽  
E. Starostina ◽  
S. Shcherbakov ◽  
B. Versprille
Keyword(s):  
Separation Process ◽  
Baker’S Yeast ◽  
Uasb Reactor ◽  
Baker's Yeast ◽  
Organic Loading ◽  
Cultivation Medium ◽  
Loading Rates ◽  
Physico Chemical ◽  
Yeast Production ◽  
Yeast Wastewater

The UASB reactor (35°C) was quite efficient for removal of bulk COD (52–74%) from simulated (on the basis of cultivation medium from the first separation process) general effluent of baker's yeast production (the average organic loading rates varied from 8.1 to 16g COD/l/d). The aerobic-anoxic biofilter (19–23°C) can be used for removal of remaining BOD and ammonia from anaerobic effluents; however, it suffered from COD-deficiency to fulfil denitrification requirements. To balance COD/N ratio, some bypass (∼10%) of anaerobically untreated general effluent should be added to the biofilter feed. The application of iron (III)-, aluminium- or calcium-induced coagulation for post-treatment of aerobic-anoxic effluents can fulfil the limits for discharge to sewerage (even for colour mainly exerted by hardly biodegradable melanoidins), however, the required amounts of coagulants were relatively high.

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