Air lift reactor wikipedia. Gas lift reactors : hydrodynamics, mass transfer, and scale up 2022-12-27

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An air lift reactor is a type of bioreactor that uses air or other gases to circulate the liquid media in which biological reactions are taking place. This type of reactor is commonly used in the field of biotechnology for the production of various substances, such as enzymes, antibiotics, and biofuels.

One of the main advantages of using an air lift reactor is that it allows for the efficient mixing of the liquid media, which is important for maintaining the appropriate conditions for the biological reactions to occur. The air or gas used to circulate the liquid can also provide oxygen, which is essential for many types of microorganisms.

The design of an air lift reactor consists of a cylindrical vessel with a central sparger, which is a device that generates bubbles of air or gas. The sparger is typically located near the bottom of the vessel and is connected to a gas source. As the bubbles rise through the liquid, they create a flow of the liquid that circulates around the vessel. This circulation helps to evenly distribute the nutrients and other substances needed for the biological reactions to occur.

One of the key factors that affects the performance of an air lift reactor is the size of the bubbles produced by the sparger. If the bubbles are too large, they may not be able to effectively mix the liquid and may cause problems with the biological reactions. On the other hand, if the bubbles are too small, they may not provide sufficient oxygen for the microorganisms.

In addition to their use in biotechnology, air lift reactors have also been used in a variety of other fields, including wastewater treatment, aquaculture, and even space exploration. Their versatility and efficiency have made them a popular choice for many applications.

Overall, the air lift reactor is a valuable tool in the field of biotechnology and has a wide range of potential applications. Its ability to effectively mix and circulate liquids, as well as provide oxygen, makes it an important tool for many biological reactions and processes.

Airlift

air lift reactor wikipedia

Retrieved 24 January 2016. The bubble sizes are much smaller in case 1 than in case 2, indicating a better distribution performance of the porous sinter-plate. Uranium and some other elements can be removed from the salt by a process called fluorine volatility: A Another simple method, tested during the MSRE program, is high temperature vacuum distillation. The gas holdup in the riser with the perforated plate case a is about twofold of that without a perforated plate case b. The thorium blanket can effectively capture leaked neutrons from the core region. They found that the liquid circulated in two-layer cyclic routes both below and above the hood, and that an extra circulating route was formed in a suitable installation position.

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air

air lift reactor wikipedia

Retrieved 7 April 2012. This complicates startup, especially for a compact design that uses a smaller primary salt inventory. External or outer-loop ALRs are constructed using separate riser and downcomer compartments connected by horizontal ducts near the top and bottom sections Figure 2 a. Comparisons between cellulase production by Aspergillus fumigatus in agitated vessels and in an air-left fermentor. The LFTR concept was first investigated at the LFTRs differ from other power reactors in almost every aspect: they use thorium that is turned into uranium, instead of using uranium directly; they are refueled by pumping without shutdown. This classification is based on both agitation and aeration as it relates to oxygen supply.

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Gas lift reactors : hydrodynamics, mass transfer, and scale up

air lift reactor wikipedia

A typical chemostat is shown in Fig. If the protactinium remains in the reactor, small amounts of U-232 are also produced. It was reported that the axial distribution of the solid concentration tended to be homogeneous when the superficial gas velocity and solid loading were increased in the whole reactor. Retrieved 27 June 2017. The main goal of these processes is to make a heterogeneous physical system homogeneous by using manipulating operations. Retrieved 24 December 2015. The draft tube is always an inner tube this kind of air-lift bioreactor is called "air-lift bioreactor with an internal loop or an external tube this kind of air-lift bioreactor is called "air-lift bioreactor with an external loop which improves circulation and oxygen transfer and equalizes shear forces in the reactor.

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Gas

air lift reactor wikipedia

Such a reactor would not reprocess fuel while operating. This relieved the stress and allowed the alloy to withstand considerable neutron flux. Retrieved 7 May 2020. They require additional slowly-evolving neutrons from fission product decay to continue the chain reaction. Retrieved 24 October 2012.

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Liquid fluoride thorium reactor

air lift reactor wikipedia

Read more Navigate Down New Developments and Application in Chemical Reaction Engineering Tiefeng Wang,. Archived from PDF on 22 January 2012. . Just do not miss this one! Retrieved 24 October 2012. Also a harder neutron spectrum helps to achieve acceptable breeding without protactinium isolation. This makes thorium a more cost efficient and less environmentally damaging fuel source. Archived from PDF on 14 January 2010.

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Airlift

air lift reactor wikipedia

In the conventional design shown in Figure 1, the circulating fluid flowing from the downcomer can force gas distribution toward one of the walls of the risers, which promotes bubble coalescence and channeling. However, many industrial applications use static mixers, that is the reactor position is fixed. Held September 24—27, 1992 at the University of North Carolina at Wilmington, Wilmington, NC. The main design question when deciding between a one and a half or two fluid LFTR is whether a more complicated reprocessing or a more demanding structural barrier will be easier to solve. Retrieved 24 October 2012.

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Airlift Loop Reactor

air lift reactor wikipedia

Bubble Columns and Air-Lift Reactors A second important category is non- This type of Also in these reactors, the cellular environment varies continuously, which needs to be assessed for successful development and scale-up. Retrieved 24 October 2012. A fed-batch operation is that operation in which one or more nutrients are added continuously or intermittently to the initial medium after the start of cultivation or from the halfway point through the batch process. Molten Salt Panel 1997. Besides, these techniques do not allow good understanding of the underlying mechanisms and principles of the particular mixing processes, which are often largely dependent on the properties of the components.

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Airlift (film)

air lift reactor wikipedia

A phauxostat is an extended nutristat which maintains the pH value of the medium in the fermenter at a preset value. News, 18-Sep-78 : Roca et. Encyclopedia of Insurgency and Counterinsurgency: A New Era of Modern Warfare: A New Era of Modern Warfare. Retrieved 24 January 2016. Airlift Bioreactors: Review of Recent Advances Authors: J.


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Bubble Columns and Air

air lift reactor wikipedia

Newer designs usually avoid the Pa removal Separation is more difficult if the fission products are mixed with thorium, because thorium, plutonium and the lanthanides rare earth elements are chemically similar. Archived from PDF on 11 August 2014. As the LFTR does not have xenon poisoning, there is no problem reducing the power in times of low demand for electricity and turn back on at any time. Retrieved 17 April 2013. It is widely accepted that the design and scale-up of ALRs still remain difficult due to the nature of complex multiphase flow, though considerable research advances have been made. In the case of flow division, a processed material divides at the leading edge of each element of the mixer and follows the channels created by the element shape. Retrieved 28 June 2012.

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Airlift pump

air lift reactor wikipedia

Retrieved 2 January 2016. Tactical 19,050 2,380 NM Mach. The pump is either on or off. However, the technical feasibility of all types of fermentations—plant cell, tissue culture, bacterial, fungal, and those utilizing yeasts—in airlift vessels has been demonstrated. In a large scale ALR, internals are needed to regulate the liquid circulation velocity, break bubbles and improve the hydrodynamic behavior.

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