Mass transfer rate from gas bubbles into liquid in presence of solid particles with strong adsorbing properties

1989 ◽  
Vol 54 (11) ◽  
pp. 3061-3068 ◽  
Author(s):  
Jan Kratochvíl ◽  
František Kaštánek
Keyword(s):  
Mass Transfer ◽  
Active Carbon ◽  
Mass Transfer Rate ◽  
Solid Particles ◽  
Pure Liquid ◽  
Carbon Particles ◽  
Carbon Soot ◽  
Negative Effect ◽  
Liquid Mass Transfer ◽  
Positive Effect

The presence of small particles with adsorbing activity (carbon soot, active carbon etc.) in the bubble bed augments the gas-liquid mass transfer coefficient kLa about approximately 20% in comparison with pure liquid. This fact can be explained by penetrating and disturbance effect of particles into the boundary layer of liquid near the interface. This activity is however reduced to small concentrations of particles (0.07% mass in the case of carbon soot, 0.5%-1.0% mass for active carbon particles). Addition of small amount of particles with adsorbing activity to the liquids containing superficial active agents (tensides) can partially overcome the negative effect of tensides on kLa value. The positive effect of particles of active carbon on kLa in bubble beds is less pronounced than that published for the case of mechanically agitated vessels.

Enhancement of formic acid production from CO2 in formate dehydrogenase reaction using nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 109978-109982 ◽  
Author(s):  
Young-Kee Kim ◽  
Sung-Yeob Lee ◽  
Byung-Keun Oh
Keyword(s):  
Mass Transfer ◽  
Formic Acid ◽  
Acid Production ◽  
Transfer Rate ◽  
Formate Dehydrogenase ◽  
Mass Transfer Rate ◽  
Liquid Mass ◽  
Dehydrogenase Reaction ◽  
Liquid Mass Transfer ◽  
Mesoporous Nanoparticles

In an enzyme process using a gas substrate, the enhanced gas liquid mass transfer rate of the gas substrate by methyl-functionalized mesoporous nanoparticles could improve the productivity.

scholarly journals Gas-solid and gas-liquid mass transfer: Effect of turbulent Schmidt number

2007 ◽  
Vol 13 (3) ◽  
pp. 167-168 ◽  
Author(s):  
Aleksandar Dudukovic ◽  
Rada Pjanovic
Keyword(s):  
Mass Transfer ◽  
Eddy Viscosity ◽  
Schmidt Number ◽  
Mass Transfer Rate ◽  
Transfer Effect ◽  
Transfer Coefficients ◽  
Mass Transfer Effect ◽  
Liquid Mass ◽  
Turbulent Schmidt Number ◽  
Liquid Mass Transfer

The scope of this paper is to explain effect of eddy viscosity and turbulent Schmidt number on mass transfer rate. New, theoretically based correlation for gas-liquid mass transfer coefficients are proposed.

Performance evaluation and effect of biogas circulation rate of a bubble column for biological desulfurization

2012 ◽  
Vol 66 (9) ◽  
pp. 1914-1922 ◽  
Author(s):  
Takuro Kobayashi ◽  
Kai-Qin Xu ◽  
Yu-You Li ◽  
Yuhei Inamori
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
Removal Rate ◽  
Mass Transfer Rate ◽  
Circulation Rate ◽  
Bubble Column Reactor ◽  
Sulfate Production ◽  
Liquid Mass ◽  
Batch Tests ◽  
Liquid Mass Transfer

Biological desulfurization using a bubble column reactor was investigated in a continuous biogas treatment. Rapid biogas circulation between the digester and the bubble column for biological desulfurization was used to stimulate the gas–liquid mass transfer of H2S. A positive correlation between the biogas circulation rate and H2S removal rate was observed. Moreover, the increase in the circulation rate stimulated the O2 mass transfer, eventually translating into an increase in sulfate production from the oxidation of H2S. Throughout the continuous experiment, the reactor retained sufficient levels of sulfide-oxidizing bacteria. A comparison of the results of the continuous biogas treatment and batch tests suggests that the gas–liquid mass transfer rate of H2S was the rate-limiting step in the biological desulfurization in the reactor, indicating that the mass transfer efficiency of H2S needs to be improved to enhance the desulfurization performance.

The effect of microbubbles on gas-liquid mass transfer coefficient and degradation rate of COD in wastewater treatment

2016 ◽  
Vol 73 (8) ◽  
pp. 1969-1977 ◽  
Author(s):  
Kangning Yao ◽  
Yong Chi ◽  
Fei Wang ◽  
Jianhua Yan ◽  
Mingjiang Ni ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Degradation Rate ◽  
Mass Transfer Rate ◽  
Cod Removal ◽  
Liquid Mass ◽  
Liquid Mass Transfer

A commonly used aeration device at present has the disadvantages of low mass transfer rate because the generated bubbles are several millimeters in diameter which are much bigger than microbubbles. Therefore, the effect of a microbubble on gas-liquid mass transfer and wastewater treatment process was investigated. To evaluate the effect of each bubble type, the volumetric mass transfer coefficients for microbubbles and conventional bubbles were determined. The volumetric mass transfer coefficient was 0.02905 s−1 and 0.02191 s−1 at a gas flow rate of 0.67 L min−1 in tap water for microbubbles and conventional bubbles, respectively. The degradation rate of simulated municipal wastewater was also investigated, using aerobic activated sludge and ozone. Compared with the conventional bubble generator, the chemical oxygen demand (COD) removal rate was 2.04, 5.9, 3.26 times higher than those of the conventional bubble contactor at the same initial COD concentration of COD 200 mg L−1, 400 mg L−1, and 600 mg L−1, while aerobic activated sludge was used. For the ozonation process, the rate of COD removal using microbubble generator was 2.38, 2.51, 2.89 times of those of the conventional bubble generator. Based on the results, the effect of initial COD concentration on the specific COD degradation rate were discussed in different systems. Thus, the results revealed that microbubbles could enhance mass transfer in wastewater treatment and be an effective method to improve the degradation of wastewater.

scholarly journals Effect of Particle Penetration Depth on Solid/liquid Mass Transfer Rate by Particle Blowing Technique

2017 ◽  
Vol 57 (11) ◽  
pp. 1902-1910 ◽  
Author(s):  
Takahiro Okuno ◽  
Md. Azhar Uddin ◽  
Yoshiei Kato ◽  
Sang Beom Lee ◽  
Yong Hwan Kim
Keyword(s):  
Mass Transfer ◽  
Penetration Depth ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Liquid Mass ◽  
Particle Penetration ◽  
Liquid Mass Transfer ◽  
Solid Liquid
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