By Ghasem Najafpour
Wide software of bioprocesses has generated a selection in biotechnological wisdom, generated by way of the appliance of biochemical engineering to biotechnology. Microorganisms produce alcohols and acetone which are utilized in business tactics. the data with regards to business 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 reinforce commercial fermentation. eventually, those bioprocesses became a brand new means of constructing advertisement items. Biochemical Engineering and Biotechnology demonstrates the appliance of organic sciences in engineering with theoretical and useful points to augment realizing of information during this box. The booklet adopts a pragmatic procedure, exhibiting similar case stories with unique examine information. it truly is an amazing textual content ebook for faculty and college classes, which courses scholars during the lectures in a transparent and well-illustrated demeanour. Г‚В· Demonstrates the appliance of organic sciences in engineering with theoretical and functional points. Г‚В· specific sensible method, utilizing case reports, certain experiments, unique learn info and difficulties and attainable options. Г‚В· offers precise experiments with basic layout equations and the necessary calculations.
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Extra info for Biochemical Engineering and Biotechnology
Variation of DO may affect retention time and other process variables such as substrate and product concentrations, retention time, dilution rate and aeration rate. Microbial activities are monitored by the oxygen uptake rate from the supplied air or oxygen. Microbial cells in the aerobic condition take up oxygen from the gas and then liquid phases. The rate of oxygen transfer from the gas phase to liquid phase is important. At high cell densities, the cell growth is limited by the availability of oxygen in the medium.
Agitation in a fermentation unit is directly related to oxygen transported from the gas phase to liquid phase followed by oxygen uptake by the individual microbial cell. The activities of microorganisms are monitored by the utilisation of oxygen from the supplied air and the respiration quotient. The primary and secondary metabolites in a bioprocess can be estimated based on projected pathways for production of intracellular and extracellular by-products. In the previous chapter, dissolved oxygen was discussed; in this chapter, mechanisms of oxygen transport are focused on.
L-1. min-1 FIG. 1. Effect of air flow rate on oxygen transfer coefficients, KLa. (l. lϪ1. 5–5 kW/m3. Virtually all large-scale operations and commercialsize continuous stirred tank reactors (CSTRs) operate mostly in a free bubble-rise regime. The most important property of air bubbles in the fermenters is their size. If the gas is dispersed into many small bubbles rather than a few large ones, more interfacial area per unit volume results. Small bubbles have a slow rising velocity. Consequently, they stay longer in contact with the liquid, which allows more time for oxygen to dissolve.