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Article
Estimation and Simulation in Batch Fermentation of Baker’s Yeast Producfion

Authors: Abdul-Kahar M. Al-Samuray --- Salam K. Al-Dawery
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2007 Volume: 8 Issue: 3 Pages: 19-22
Publisher: Baghdad University جامعة بغداد

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Abstract

Baker’s Yeast is an important additive among the substances, which improves bred quality, thus, a consideration has been made to study the conditions and parameters that affecting the production of the yeast in a batch fermenter experimentally and theoretically. Experimental runs were implemented in a 12-liter pilot-scale fermenter to predict the rate of growth and other parameters such as amount of additive consumed and the amount of heat generated The process is modeled and performed using a computer programming propped for this purpose, the model gave a good agreement comparing to the experimental work specially in the log phase.

Keywords

fermentation --- simulation --- yeast.


Article
Performance of Pulsator Clarifier (Low Turbidity)

Authors: Salam K. Al-Dawery --- Raad M. Hussain --- Kadhem M. Shibeeb
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2007 Volume: 8 Issue: 1 Pages: 9-17
Publisher: Baghdad University جامعة بغداد

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Abstract

Experimental and theoretical investigations are presented on flocculation process in pulsator clarifier. Experimental system was designed to study the factors that affecting the performance of pulsator clarifier. These factors were water level in vacuum chamber which range from 60 to 150 cm, rising time of water in vacuum chamber which having times of 20, 30 & 40 seconds, and sludge blanket height which having heights of 20, 30 & 40 cm. The turbidity and pH of raw water used were 200 NTU and 8.13 respectively. According to the jar test, the alum dose required for this turbidity was 20 mg/l. The performance parameters of pulsator clarifier such as, turbidity, total solids TS, shear rate, volume concentration of sludge blanket and the flocculation criteria were studied. It was observed that by decreasing the water level in vacuum tube and by increasing the rising time and sludge blanket height, low turbidity of output water attained. Moreover, flocculation criteria value GCt was within the optimum range values (100-500). A theoretical models was applied for total solids TS of output water. The difference between experimental and theoretical data was ranged between (11-24)% of mean deviation at water level range of (125-150) cm and sludge blanket height 20 cm.

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