Oxygen transfer in a gas–liquid system containing solids of varying oxygen affinity

Littlejohns, Jennifer V.; Daugulis, Andrew J.

doi:10.1016/j.cej.2006.11.002

Cited by 53 publications

(48 citation statements)

References 24 publications

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“…In order to compare the data measured under different conditions and apply these data to a practical project, K La is modified with the following formula [1] (Eqn (3)):…”

Section: Determination Of the K La Valuementioning

confidence: 99%

“…Littlejohns et al . [1] investigated the effect of different solid phases on oxygen mass transfer, and showed that a higher enhancement of K La was observed for small, inert solid particles. He et al .…”

Section: Introductionmentioning

confidence: 99%

“…[1 -9] As a result, the volumetric oxygen mass transfer coefficient K La is often quantified in order to allow proper system design. [1,10,11] The moving-bed biofilm reactor (MBBR) has emerged as a compact treatment alternative to conventional activated sludge reactors for the treatment of industrial wastewater. It is a highly effective biological treatment process that was developed on the basis of the conventional activated sludge process and the fluidizedbed reactor.…”

Section: Introductionmentioning

confidence: 99%

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Carrier effects on oxygen mass transfer behavior in a moving‐bed biofilm reactor

Jing

Feng

2009

Asia-Pacific J Chem Eng

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This study investigates the carrier effects on the oxygen mass transfer behavior of a gas-liquid biofilm surface, and aims to provide evidence for parameter optimization in the practical operation of a moving-bed biofilm reactor (MBBR) during the coking-plant wastewater process. By using the dynamic oxygen dissolution method, the volumetric oxygen mass transfer coefficient K La was measured by varying the suspended carrier stuffing rate and the intensity of aeration. Within the range of fluidizable flow rate, the efficiency of oxygen mass transfer increased with suspended carrier stuffing rate, and K La reached its peak value when the stuffing rate was 40%. K La has an increasing trend with an increase of the aeration intensity, but high aeration intensity was not favorable for reactor operation. Better oxygen mass transfer effect and higher oxygen transfer efficiency could be achieved when the aeration intensity was 0.3 m 3 h −1 and the suspended carrier stuffing rate was 30-50%. The possible mechanisms that can account for carrier effects on oxygen mass transfer are the changes in the gas-liquid interfacial area. The ammonia nitrogen removal performance of the coking-plant wastewater in MBBR was satisfied by using the above-suggested conditions.  2009

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“…In order to compare the data measured under different conditions and apply these data to a practical project, K La is modified with the following formula [1] (Eqn (3)):…”

Section: Determination Of the K La Valuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carrier effects on oxygen mass transfer behavior in a moving‐bed biofilm reactor

Jing

Feng

2009

Asia-Pacific J Chem Eng

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“…Volumetric mass transfer coefficient value increased (Alper et al, 1980;Brehm et al, 1985;Lu et al, 1993), was constant (Kralj & Sinic, 1984) or slightly decreased (Chapman et al, 1983) with adding the particles in the system. Such differences can suggest that very important are properties of the particles, containing particle size (Ozbek & Gayik, 2001), density, hydrophobicity, oxygen diffusivity (Zhang et al, 2006;Littlejohns et al, 2007) and concentration. Various mechanisms were proposed for describing an enhancement of k L a caused by the particles.…”

Section: Survey Of the Results For Gas-liquid Systemmentioning

confidence: 99%

Mass Transfer in Multiphase Mechanically Agitated Systems

Kiełbus-Rąpała¹,

Karcz²

2011

Mass Transfer in Multiphase Systems and Its Applications

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“…10- 15 Olle et al 12 reported that the oxygen-water mass-transfer rate was enhanced by a factor of approximately 600% upon addition of magnetite (Fe 3 O 4 ) nanoparticles coated with oleic acid and a surfactant. Zuidervaart et al 16 concluded that the oxygen-water mass-transfer rate was enhanced by up to a factor of 250% when metal sulfate electrolytes [e.g., CuSO 4 , FeSO 4 , ZnSO 4 , and Al 2 (SO 4 ) 3 ] were added to the solution.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrolytes on CO−Water Mass Transfer

Zhu

Shanks

Heindel

2009

Ind. Eng. Chem. Res.

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The influence of various electrolytes such as sulfate, nitrate, and chloride on CO-water mass transfer was investigated in this study. The results indicate that the enhancement in the CO-water volumetric masstransfer coefficient ranged from 1.5 to 4.7 times that of a baseline system without electrolytes, depending on electrolyte type and concentration. For those electrolytes with the same anions, copper-containing electrolytes provided stronger enhancement, whereas for those electrolytes with the same cations, sulfatecontaining electrolytes showed stronger enhancement. By measuring both the CO-water volumetric masstransfer coefficient (kLa) and the mass-transfer coefficient (kL), it was found that the electrolytes inhibit gas bubble coalescence. This leads to an increase in the gas-liquid interfacial area, resulting in CO-water masstransfer enhancement. In contrast, when MCM41 nanoparticles with or without functionalized mercaptopropyl groups were added to water, the mass-transfer coefficient and CO-water interfacial area were both increased. KeywordsMechanical Engineering, baseline systems, functionalized, gas bubbles, gas liquids, interfacial areas, masstransfer coeficients, water mass, chlorine compounds, coalescence, mass transfer The influence of various electrolytes such as sulfate, nitrate, and chloride on CO-water mass transfer was investigated in this study. The results indicate that the enhancement in the CO-water volumetric masstransfer coefficient ranged from 1.5 to 4.7 times that of a baseline system without electrolytes, depending on electrolyte type and concentration. For those electrolytes with the same anions, copper-containing electrolytes provided stronger enhancement, whereas for those electrolytes with the same cations, sulfate-containing electrolytes showed stronger enhancement. By measuring both the CO-water volumetric mass-transfer coefficient (k L a) and the mass-transfer coefficient (k L ), it was found that the electrolytes inhibit gas bubble coalescence. This leads to an increase in the gas-liquid interfacial area, resulting in CO-water mass-transfer enhancement. In contrast, when MCM41 nanoparticles with or without functionalized mercaptopropyl groups were added to water, the mass-transfer coefficient and CO-water interfacial area were both increased.

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Oxygen transfer in a gas–liquid system containing solids of varying oxygen affinity

Cited by 53 publications

References 24 publications

Carrier effects on oxygen mass transfer behavior in a moving‐bed biofilm reactor

Carrier effects on oxygen mass transfer behavior in a moving‐bed biofilm reactor

Mass Transfer in Multiphase Mechanically Agitated Systems

Effect of Electrolytes on CO−Water Mass Transfer

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