Absorption in a rotating-disk gas-liquid contactor
30 Dec 1972-Journal of Chemical Engineering of Japan (The Society of Chemical Engineers, Japan)-Vol. 5, Iss: 4, pp 381-385
TL;DR: In this paper, a rotating-disk gas-liquid contactor with wire mesh disks was used to study the rate of oxygen absorption into water, where liquid films were formed on the surface of disks rotating around the horizontal axis.
Abstract: Rates of oxygen absorption into water were studied in a rotating-disk gas-liquid contactor, in which liquid films were formed on the surface of disks rotating around the horizontal axis. When plain disks were used, values of the liquid-phase mass transfer coefficient kL were lower than those predicted from the penetration model. However, with disks made of appropriate wire mesh, kL, values agreed quite well with prediction by the penetration model for the range of gas-liquid contact time from 0.2 to 1.5 seconds.This type of gas-liquid contactor equipped with wire mesh disks seems to be a useful apparatus for studies of liquid-phase mass transfer in gas absorption.
Citations
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TL;DR: In this paper, the authors reviewed the process design aspects of RBCs and compared the RBC system with the other wastewater treatment facilities such as the activated sludge process and trickling filters in terms of its oxygen-transfer efficiency.
Abstract: Rotating biological contactors (RBCs) offer an alternative treatment technology to the conventional activated sludge process. The principal advantages of the RBC stem from the fact that the interfacial area generated is very high and practically independent of the speed of rotation, unlike in the activated sludge process. In the present work, the process design aspects of RBCs are reviewed. The published literature on various aspects such as media employed in RBCs, hydrodynamic characteristics, power consumption, and mass-transfer characteristics is reviewed. The various models proposed for the design of RBC systems are reviewed. A stepwise procedure is given for the process design of an RBC system. The RBC system is compared with the other wastewater treatment facilities such as the activated sludge process and trickling filters in terms of its oxygen-transfer efficiency.
103 citations
TL;DR: A simplified linear model between K(L)a and the volume renewal number is proposed and both modified Kim and Molof and linear model estimate the overall oxygen transfer coefficient (K( L)a) accurately.
44 citations
Cites background or result from "Absorption in a rotating-disk gas-l..."
...Yamane and Yoshida (1972), used a theoretical approach to solve the differential equation of oxygen diffusion through the liquid film covering a disc....
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...The values of KL were 30–50% lower than the predicted values given by Yamane and Yoshida (1972) and Bintanja et al. (1975)....
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TL;DR: In this paper, the authors used tracer gas to quantify the purely physical gas liquid exchange in rotating biological contactors (RBCs) in order to measure the physical transfer coefficient with clean discs in tap water and in waste water.
37 citations
34 citations
TL;DR: For a rotating disc gas-liquid contactor, a relationship between the amount of liquid entrained by a disc and its rotational velocity has been derived in this article, where the experimental value for K was estimated: 1.31 10−4 m 1 2 s 1 2 1/2 s 1 /2, which compares well with the theoretical value of 1.20 10−2 m 1/4 s 1/ 2 s/2 2/1/2.
33 citations