By Ghasem Najafpour
Large software of bioprocesses has generated a variety in biotechnological wisdom, generated by way of the appliance of biochemical engineering to biotechnology. Microorganisms produce alcohols and acetone which are utilized in commercial tactics. the information regarding commercial microbiology has been revolutionized by means of the power of genetically engineered cells to make many new items. Genetic engineering and gene mounting has been built to augment commercial fermentation. eventually, those bioprocesses became a brand new approach of constructing advertisement items. Biochemical Engineering and Biotechnology demonstrates the appliance of organic sciences in engineering with theoretical and useful features to reinforce figuring out of data during this box. The e-book adopts a realistic technique, exhibiting comparable case reviews with unique examine facts. it truly is an awesome textual content booklet for school and college classes, which publications scholars during the lectures in a transparent and well-illustrated demeanour. Г‚В· Demonstrates the applying of organic sciences in engineering with theoretical and useful elements. Г‚В· specific useful process, utilizing case reviews, designated experiments, unique examine facts and difficulties and attainable strategies. Г‚В· provides targeted experiments with basic layout equations and the necessary calculations.
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In both probes, there are membranes that are permeable to oxygen. Oxygen diffuses through the membrane and reaches to cathode, where it reacts to produce a current between anode and cathode proportional to the oxygen partial pressure in the fermentation broth. The electrolyte solutions in the electrode take part in the reactions and must be located in the bulk of liquid medium. There several DO probes available. Some well-known branded fermenters, like New Brunswick, Bioflo series and the B. Braun Biotstat B fermenters are equipped with a DO meter.
The level of DO in the media is a function of temperature. Higher operating temperatures decrease the level of DO. To have sufficient oxygen, an air sparger is required to purge compressed air or pressured air to be bubbled into the media. The availability of oxygen is a major parameter to be considered for effective microbial cell growth rate. 4 AIR SPARGER Air under pressure is supplied through a tube end consists of an ‘O’ ring with very fine holes or orifices. The size of bubbles depends on the size of hole and type of sparger.
For a flow rate of 100 m3иhϪ1 and initial substrate So is 20,000 ppm in an aeration tank volume of V ϭ 10 m3, what would be the BOD concentration if an oxygen rate of 2 m3 hϪ1 is supplied, and what would be the leaving substrate concentration, S? qxd 10/27/2006 38 10:47 AM Page 38 BIOCHEMICAL ENGINEERING AND BIOTECHNOLOGY x+Δ x x Fx + dV FO dx = Fx +dx dt F Product FIG. 2. Schematic diagram of plug flow reactor. In Out 0 L FIG. 3. Schematic diagram of plug flow bioreactor. 2. 15) Generally residence time is obtained by division of working volume by volumetric flow rate.