Culture of bacteria in an aerated, rectangular tank reactor

Backhurst, J.R.; Chaalal, Omar; Harker, J.H.; Hancock, I.C.; Mellstrom, C.

doi:10.1111/j.1472-765x.1991.tb00490.x

Cited by 4 publications

(5 citation statements)

References 5 publications

(8 reference statements)

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“…This process provides very efficient and rapid mass transfer in the liquid phase (Chaalal and Daweder, 2000;Chaalal and Islam, 2001). For bacteria, this system provides an effective aeration technique that is non-intrusive and is particularly helpful for growing filamentous bacteria (Backhurst et al, 1991). The location of the air curtain, as well as the flow rate of the compressed air, has been optimized.…”

Section: Materials Usedmentioning

confidence: 99%

A New Technique of Solar Bioremediation

2005

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Section: Materials Usedmentioning

confidence: 99%

A New Technique of Solar Bioremediation

2005

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“…He investigated the speed of the current and the thickness of the horizontal currents produced by an air curtain in water with a depth of up to 10.4 m. Backhurst et al investigated the possibility of using a square-shaped bioreactor agitated by an air curtain as a solution for the shear stress sensor cell. This application showed that the agitation by air alone could be a solution to the inadequate or unsatisfactory performance of mechanical agitators [4]. A recent study by Mirek showed the results of simulation calculations and practical equations for a distributor pressure drop calculation that takes into account different degrees of tuyere destruction [14].…”

Section: Introductionmentioning

confidence: 97%

“…For many years, air was used for agitating and mixing in the process industry; the recycling of newspaper; the processing of beer, dyes, and mineral pulp; oxidation; hydrogenation; biological fermentation; antibiotic development; and many other processes [1][2][3]. In aerated mixing vessels, gases and liquids come in contact with each other and are mixed to reach steady conditions and uniformity [4,5].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Novel Air Bubble Curtain for Mixing and Aeration in Process Vessels

Chaalal,

Mouli R. Madhuranthakam,

Al Hashimi

et al. 2023

Processes

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This article focuses on designing and analyzing a new method for mixing in process vessels. We propose using an air bubble curtain to accomplish the desired mixing. The air bubble curtain used in this study is made of an empty pipe with several holes through which air is pumped, which in turn produces a swarm of bubbles that causes pseudo-turbulent mixing in the tank filled with a liquid solution. A uniform distribution of bubbles within the tank was assured by maintaining a see-saw movement of the air bubble curtain. Mixing inside the tank was quantified by measuring the salt concentration in a laboratory model tank (30 cm × 30 cm × 30 cm) and a pilot-scale tank (200 cm × 100 cm × 100 cm). The optimal flow rates of air and the mixing time in both tanks that can achieve complete mixing were obtained from the experimental results. The proposed air bubble curtain can be of potential use in wastewater treatment, biotechnology, and aquaculture where turbulent mixing is required with minimum energy dissipation per unit mass.

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“…The same technique of aeration was used by Al-Maghrabi et al (1997) for the growth of bacteria for bioremediation of petroleum contaminant. Further, Hamad and co-workers (1997) incorporated an aerated tank reactor agitated by an air curtain similar to the one used by Backhurst et al (1991) in a novel water purification technique that uses bentonite in suspension to eliminate strontium from water.…”

Section: Introductionmentioning

confidence: 99%

“…These vessels exist under different design, airlifts, and bubble columns. Recently, Backhurst et al (1991) introduced for the first time in the field of bioengineering a new type of square tank agitated by an air curtain. In these tanks, the air curtain is created by linesource bubble plumes.…”

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confidence: 99%

An Experimental Study of Fluid Motion in a Bioreactor Agitated by Line-Source Bubble Plumes

Chaalal

2005

Energy Sources

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The focus of this study is the movement of the fluid contained in a rectangular bioreactor agitated by line-source bubble plumes. The research included visualization of fluid motion by white polystyrene beads and supported by intensive video recording. Water velocity at the surface and at the bottom, as well as the velocity along the depth, have been measured in two aerated rectangular vessels (36 × 10 −3 m 3 and 2 m 3 in volume) using tap water, as a function of the characteristic velocity (qg)0.33. It was confirmed that the best location of the perforated tube was in the middle of tank and the minimum air flow rate to maintain particle suspension was reached when the aerated surface was a rectangular surface in which the length is twice the width. In addition, the relationship between the fluid velocity, air flow rate, height of the liquid and flow patterns were discussed. Finally, a correlation for the velocity in the liquid was developed and found to be adequate in the scale-up of aerated tanks agitated by an air curtain.Aerated vessels have been widely used in many parts of the world for certain biodegradable industrial waste and wastewater treatment processes. They are also found in chemical engineering as unit operations and as fermenters in biotechnology due to their simple construction, low power requirement and low shear Robinson, 1992a, 1992b). These vessels exist under different design, airlifts, and bubble columns. Recently, Backhurst et al. (1991) introduced for the first time in the field of bioengineering a new type of square tank agitated by an air curtain. In these tanks, the air curtain is created by linesource bubble plumes. Unfortunately, much of the published material on aerated vessels has been concerned with the study of bubble columns and airlift and, therefore, very few papers have dealt with square tanks agitated by an air curtain via a perforated pipe. While aerated vessels agitated by line-source bubble plumes differ from bubble columns and airlift, few publications simply report their use in waste water treatments.In the tanks studied, flow patterns are maintained by an air curtain rising within the vessel. The movement produced by this air curtain interchanges fluid between different parts of the vessel, maintaining particle suspension while promoting gentle mixing. The applications of this type of tank are far reaching in the field of biotechnology.

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Culture of bacteria in an aerated, rectangular tank reactor

Cited by 4 publications

References 5 publications

A New Technique of Solar Bioremediation

A New Technique of Solar Bioremediation

Design and Analysis of a Novel Air Bubble Curtain for Mixing and Aeration in Process Vessels

An Experimental Study of Fluid Motion in a Bioreactor Agitated by Line-Source Bubble Plumes

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