LIQUID HOLDUP OF FOAM AS AN INDEX FOR MECHANICAL FOAM-CONTROL IN GAS-LIQUID CONTACTOR

1985 ◽  
Vol 14 (1) ◽  
pp. 99-102
Author(s):  
Akira Ohkawa ◽  
Yasuyuki Ueda ◽  
Nobuyuki Sakai
Keyword(s):  
Liquid Holdup ◽  
Mechanical Foam ◽  
Foam Control

scholarly journals Operational characteristics of aerated agitated vessels under mechanical foam control.

1991 ◽  
Vol 24 (4) ◽  
pp. 531-535
Author(s):  
Masami Yasukawa ◽  
Masayuki Onodera ◽  
Kazuaki Yamagiwa ◽  
Akira Ohkawa
Keyword(s):  
Operational Characteristics ◽  
Mechanical Foam ◽  
Foam Control

Biological treatment of highly foaming pharmaceutical wastewater by modified bubble-column under mechanical foam control

2000 ◽  
Vol 42 (3-4) ◽  
pp. 331-337 ◽  
Author(s):  
K. Yamagiwa ◽  
M. Yoshida ◽  
A. Ohkawa ◽  
S. Takesono
Keyword(s):  
Activated Sludge ◽  
Biological Treatment ◽  
Bubble Column ◽  
Bubble Columns ◽  
Pharmaceutical Wastewater ◽  
Sludge Treatment ◽  
Mechanical Foam ◽  
Breaking Mechanism ◽  
Foam Control ◽  
Sludge Settling

Activated sludge treatment of highly foaming pharmaceutical wastewater was carried out with modified bubble columns equipped with a mechanical foam-breaker (MFRD). The geometry of the bubble column was modified based on the foam breaking mechanism of the MRFD in order to improve the foam breaking capacity and hence to enhance the treatment capacity. Four types of modifications were examined. The activated sludge treatment of the wastewater with the modified columns was successfully carried out with COD removal efficiency about 90% at BOD loading of 4 g/Ld. Little effect of the mechanical foam control on the sludge settling characteristics was observed. The column modification significantly reduced the power required for foam control. The maximum power decrement of 75% was attained. Furthermore, oxygen transfer was found to be facilitated in the modified bubble columns. The results are expected to be helpful for economic and effective treatment of highly foaming organic wastewater.

Performance characteristics of a tower fermenter with mechanical foam control

2007 ◽  
Vol 56 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Satoshi Takesono ◽  
Masami Yasukawa ◽  
Masayuki Onodera ◽  
Kohji Izawa ◽  
Kazuaki Yamagiwa ◽  
...  
Keyword(s):  
Performance Characteristics ◽  
Mechanical Foam ◽  
Foam Control ◽  
Tower Fermenter

scholarly journals Performance characteristics of an aerated agitated vessel under mechanical foam control.

1991 ◽  
Vol 24 (2) ◽  
pp. 188-194 ◽  
Author(s):  
Masami Yasukawa ◽  
Masayuki Onodera ◽  
Kazuaki Yamagiwa ◽  
Akira Ohkawa
Keyword(s):  
Performance Characteristics ◽  
Agitated Vessel ◽  
Mechanical Foam ◽  
Foam Control

Mechanical foam control in a stirred draft-tube bioreactor

2008 ◽  
Vol 34 (2) ◽  
pp. 87-96 ◽  
Author(s):  
Akira Ohkawa ◽  
Nobuyuki Sakai ◽  
Hiroshi Imai ◽  
Kazuo Endoh
Keyword(s):  
Draft Tube ◽  
Mechanical Foam ◽  
Foam Control

Correlations Review for the Slug Liquid Holdup Prediction in Intermittent Gas-Liquid Flows

2020 ◽  
Author(s):  
Gabriel de Freitas Barboza ◽  
Pedro Leineker Ochoski Machado ◽  
Luiz Eduardo Melo Lima
Keyword(s):  
Liquid Holdup ◽  
Liquid Flows

The effect of two-phase flow regime on hydrodynamics and mass transfer in a horizontal-tube gas-liquid reactor

1985 ◽  
Vol 50 (3) ◽  
pp. 745-757 ◽  
Author(s):  
Andreas Zahn ◽  
Lothar Ebner ◽  
Kurt Winkler ◽  
Jan Kratochvíl ◽  
Jindřich Zahradník
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Flow Regime ◽  
Liquid Flow ◽  
Horizontal Tube ◽  
Liquid Holdup ◽  
Two Phase ◽  
Flow Rates ◽  
Type Relation ◽  
Good Agreement

The effect of two-phase flow regime on decisive hydrodynamic and mass transfer characteristics of horizontal-tube gas-liquid reactors (pressure drop, liquid holdup, kLaL) was determined in a cocurrent-flow experimental unit of the length 4.15 m and diameter 0.05 m with air-water system. An adjustable-height weir was installed in the separation chamber at the reactor outlet to simulate the effect of internal baffles on reactor hydrodynamics. Flow regime maps were developed in the whole range of experimental gas and liquid flow rates both for the weirless arrangement and for the weir height 0.05 m, the former being in good agreement with flow-pattern boundaries presented by Mandhane. In the whole range of experi-mental conditions pressure drop data could be well correlated as a function of gas and liquid flow rates by an empirical exponential-type relation with specific sets of coefficients obtained for individual flow regimes from experimental data. Good agreement was observed between values of pressure drop obtained for weirless arrangement and data calculated from the Lockhart-Martinelli correlation while the contribution of weir to the overall pressure drop was well described by a relation proposed for the pressure loss in closed-end tubes. In the region of negligible weir influence values of liquid holdup were again succesfully correlated by the Lockhart-Martinelli relation while the dependence of liquid holdup data on gas and liquid flow rates obtained under conditions of significant weir effect (i.e. at low flow rates of both phases) could be well described by an empirical exponential-type relation. Results of preliminary kLaL measurements confirmed the decisive effect of the rate of energy dissipation on the intensity of interfacial mass transfer in gas-liquid dispersions.

Quantitative measurements of liquid holdup and drainage in foam using NMRI

AIChE Journal ◽  
2007 ◽  
Vol 53 (2) ◽  
pp. 290-296 ◽  
Author(s):  
Paul Stevenson ◽  
Michael D. Mantle ◽  
Andrew J. Sederman ◽  
Lynn F. Gladden
Keyword(s):  
Liquid Holdup ◽  
Quantitative Measurements
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