In-situ sparging: Mass transfer mechanisms

1996 ◽  
Vol 6 (4) ◽  
pp. 15-29 ◽  
Author(s):  
Wilson S. Clayton ◽  
David H. Bass ◽  
Neil M. Ram ◽  
Christopher H. Nelson
Keyword(s):  
Mass Transfer ◽  
Transfer Mechanisms

The role of (bio)surfactant sorption in promoting the bioavailability of nutrients localized at the solid-water interface

1999 ◽  
Vol 39 (7) ◽  
pp. 91-98 ◽  
Author(s):  
Ryan N. Jordan ◽  
Eric P. Nichols ◽  
Alfred B. Cunningham
Keyword(s):  
Mass Transfer ◽  
Cell Membrane ◽  
Substrate Concentration ◽  
Water Interface ◽  
Industrial Systems ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Surfactant Sorption

Bioavailability is herein defined as the accessibility of a substrate by a microorganism. Further, bioavailability is governed by (1) the substrate concentration that the cell membrane “sees,” (i.e., the “directly bioavailable” pool) as well as (2) the rate of mass transfer from potentially bioavailable (e.g., nonaqueous) phases to the directly bioavailable (e.g., aqueous) phase. Mechanisms by which sorbed (bio)surfactants influence these two processes are discussed. We propose the hypothesis that the sorption of (bio)surfactants at the solid-liquid interface is partially responsible for the increased bioavailability of surface-bound nutrients, and offer this as a basis for suggesting the development of engineered in-situ bioremediation technologies that take advantage of low (bio)surfactant concentrations. In addition, other industrial systems where bioavailability phenomena should be considered are addressed.

scholarly journals Experimental investigation of interfacial mass transfer mechanisms for a confined high‐reynolds‐number bubble rising in a thin gap

AIChE Journal ◽  
2016 ◽  
Vol 63 (6) ◽  
pp. 2394-2408 ◽  
Author(s):  
Matthieu Roudet ◽  
Anne‐Marie Billet ◽  
Sébastien Cazin ◽  
Frédéric Risso ◽  
Véronique Roig
Keyword(s):  
Mass Transfer ◽  
Experimental Investigation ◽  
Reynolds Number ◽  
High Reynolds Number ◽  
Interfacial Mass Transfer ◽  
Bubble Rising ◽  
High Reynolds ◽  
Transfer Mechanisms

An Optical Microreactor Enabling In Situ Spectroscopy Combined with Fast Gas-Liquid Mass Transfer

2018 ◽  
Vol 90 (11) ◽  
pp. 1855-1863 ◽  
Author(s):  
Sebastian Ponce ◽  
Hauke Christians ◽  
Alfons Drochner ◽  
Bastian J. M. Etzold
Keyword(s):  
Mass Transfer ◽  
In Situ Spectroscopy ◽  
Liquid Mass ◽  
Liquid Mass Transfer

Ostwald ripening in the presence of simultaneous occurrence of various mass transfer mechanisms: an extension of the Lifshitz–Slyozov theory

2021 ◽  
Vol 379 (2205) ◽  
pp. 20200308 ◽  
Author(s):  
Irina V. Alexandrova ◽  
Dmitri V. Alexandrov ◽  
Eugenya V. Makoveeva
Keyword(s):  
Mass Transfer ◽  
Distribution Function ◽  
Ostwald Ripening ◽  
Particle Radius ◽  
Simultaneous Occurrence ◽  
Asymptotic State ◽  
Initial Condition ◽  
Relaxation Dynamics ◽  
Link Type ◽  
Transfer Mechanisms

The Ostwald ripening stage of a phase transformation process with allowance for synchronous operation of various mass transfer mechanisms (volume diffusion and diffusion along the block boundaries and dislocations) and the initial condition for the particle-radius distribution function is theoretically studied. The initial condition is taken from the analytical solution describing the intermediate stage of a phase transition process. The present theory focuses on relaxation dynamics from the beginning of the ripening process to its final asymptotic state, which is described by the previously constructed theories (Slezov VV. et al. 1978 J. Phys. Chem. Solids 39 , 705–709. ( doi:10.1016/0022-3697(78)90002-1 ) and Alexandrov & Alexandrova 2020 Phil. Trans. R. Soc. A 378 , 20190247. ( doi:10.1098/rsta.2019.0247 )). An evolutionary behaviour of particle growth rates dependent on various mass transfer mechanisms and time is analytically described. The boundaries of the transition layer, which surround the blocking point, are found. The fundamental and relaxation contributions to the particle-radius distribution function are derived for the simultaneous occurrence of various mass transfer mechanisms. The left branch of this function is shifted to smaller particle radii whereas its right branch extends to the right of the blocking point as compared with the asymptotic universal distribution function. The theory under consideration well agrees with experimental data. This article is part of the theme issue ‘Transport phenomena in complex systems (part 1)’.

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