Overall volumetric oxygen transfer coefficient and optimal geometry of airlift tube reactor

Békássy-Molnár, Erika; Majeed, J.G.; Vatai, Gyula

doi:10.1016/s1385-8947(97)00067-3

Cited by 15 publications

(10 citation statements)

References 8 publications

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“…This could minimize mass transfer resistance by the formation of liquid film without relying on a high agitation speed as in the stirred tank reactor. In addition, the k L a value of the SFR was higher than that of the bubble column reactor reported by Lau et al [15], Khrisna and Ellenberger [17], Bekassy et al [20], and Budzynski et al [32], despite the lower superficial gas velocity of the SFR. The packed bed-trickle flow reactor should be compared with the SFR at a comparable value of gas flow rate in order to have an equivalent comparison because the mass transfer of the packed bed-trickle flow reactor is significantly affected by the gas flow rate [11,27].…”

Section: Discussionmentioning

confidence: 59%

“…The common approaches that are employed to improve the volumetric liquid-side mass transfer coefficient k L a involve the optimization of operating parameters and the modification of the bioreactor configuration. A number of approaches have been employed in various types of bioreactors, for example, by increasing the mechanical agitation rate [11,12], investigating several types of impeller configuration [12], and applying a spinning disk microbubble generator [13] in a stirred tank reactor; by testing various types of membrane material [11,14] and adding an external diffuser [15] to a hollow fiber membrane reactor; by modifying the geometry of the reactor [16], testing various gas distributor designs [16], and by applying vibration excitement [17] in a bubble column reactor [18]; by modifying the reactor configuration with the addition of a semipermeable membrane [19] and by optimizing the geometry of the reactor [20] in an air-lift reactor.…”

Section: Introductionmentioning

confidence: 99%

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Mass Transfer Performance of a String Film Reactor: A Bioreactor Design for Aerobic Methane Bioconversion

Mariyana¹,

Kim

Lim

et al. 2018

Catalysts

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The mass transfer performance of a string film reactor (SFR)—a bioreactor design for the aerobic bioconversion of methane—was investigated. The results showed that the SFR could achieve high mass transfer performance of gases, and the highest values of the mass transfer coefficients for oxygen and methane were 877.1 h−1 and 408.0 h−1, respectively. There were similar mass transfer coefficients for oxygen and methane in absorption experiments using air, methane, and air–methane mixed gas under the same liquid flow rate conditions, implying that each gas is delivered into the liquid without mutual interaction. The mass transfer performance of the SFR was significantly influenced by the liquid flow rate and the hydrophilicity of the string material, whereas the magnitude of the gas flow rate effect on the mass transfer performance depended on both the tested liquid flow rate and the gas flow rate. Furthermore, the mass transfer performance of the SFR was compared with those of other types of bioreactors.

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Section: Discussionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Mass Transfer Performance of a String Film Reactor: A Bioreactor Design for Aerobic Methane Bioconversion

Mariyana¹,

Kim

Lim

et al. 2018

Catalysts

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“…According to two-film theory (Lewis and Whitman, 1924;Bekassy-Molnar et al ., 1997), the oxygen transfer coefficient at T • C, K L a T may be expressed as follows.…”

Section: Oxygen Transfer Coefficientmentioning

confidence: 99%

Aspect ratio effect on oxygen transfer process in rectangular tank surface aerator

Rao

Kumar

2007

Asia-Pacific J Chem Eng

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“…The overall volumetric oxygen transfer coefficient is frequently the basis of comparing and evaluating different design intended for gas-liquid mass transfer applications. The k L a is based on the concept that the liquid film is the controlling resistance to mass transfer (Bekassy-Molnar et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and mass transfer coefficient in activated sludge aerated stirred column reactor: experimental analysis and modeling

Jin

Lant

2005

Biotech & Bioengineering

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The aerated stirred reactor (ASR) has been widely used in biochemical and wastewater treatment processes. The information describing how the activated sludge properties and operation conditions affect the hydrodynamics and mass transfer coefficient is missing in the literature. The aim of this study was to investigate the influence of flow regime, superficial gas velocity (U(G)), power consumption unit (P/V(L)), sludge loading, and apparent viscosity (mu(ap)) of activated sludge fluid on the mixing time (t(m)), gas hold-up (epsilon), and volumetric mass transfer coefficient (k(L)a) in an activated sludge aerated stirred column reactor (ASCR). The activated sludge fluid performed a non-Newtonian rheological behavior. The sludge loading significantly affected the fluid hydrodynamics and mass transfer. With an increase in the U(G) and P/V(L), the epsilon and k(L)a increased, and the t(m), decreased. The epsilon, k(L)a, and t(m), were influenced dramatically as the flow regime changed from homogeneous to heterogeneous patterns. The proposed mathematical models predicted the experimental results well under experimental conditions, indicating that the U(G), P/V(L), and mu(ap) had significant impact on the t(m), epsilon, and k(L)a. These models were able to give the t(m), epsilon, and k(L)a values with an error around +/-8%, and always less than +/-10%.

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Overall volumetric oxygen transfer coefficient and optimal geometry of airlift tube reactor

Cited by 15 publications

References 8 publications

Mass Transfer Performance of a String Film Reactor: A Bioreactor Design for Aerobic Methane Bioconversion

Mass Transfer Performance of a String Film Reactor: A Bioreactor Design for Aerobic Methane Bioconversion

Aspect ratio effect on oxygen transfer process in rectangular tank surface aerator

Hydrodynamics and mass transfer coefficient in activated sludge aerated stirred column reactor: experimental analysis and modeling

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