Combined Absorption and Self-Decomposition of Ozone in Aqueous Solutions with Interfacial Resistance
- 1 January 1996
- journal article
- research article
- Published by Taylor & Francis in Ozone: Science & Engineering
- Vol. 18 (2), 183-194
- https://doi.org/10.1080/01919519608547337
Abstract
A theoretical analysis is performed employing the film model for the isothermal absorption and self-decomposition of ozone in aqueous solutions with interfacial resistance, which is inversely proportional to the interfacial mass transfer coefficient ks. A closed-form solution has been obtained. The effects of system parameters on the ozone mass transfer rate are examined. These parameters include the interfacial resistance (1/ks), the acidic and basic self-decomposition reaction rate parameters (Mm 0.5, Mn 0.5.; Mm = [2DAkmCAi m-1/(m+1)]/(kL 0)2, Mn=(2DAknCAi n-1/(n+1))/(kL 0)2, the reaction orders (m,n), the pH value of solution, and the liquid-phase mass transfer coefficient (kL 0). The results indicate that the reduction effect of the interfacial resistance on the absorption rate is most significant for the situation with the larger values of Mm and Mn as well as with higher pH values. Also, for any particular finite value of kL 0/ks, the reduction effect encountered is greater for a gas liquid contactor with a lower kL 0. The reduction effect should be avoided in order to maintain a higher mass transfer rate of ozone in aqueous solution. This analysis is of importance for the efficient use of ozone in water/wastewater treatment processes in the presence of interfacial resistance substances such as surface active agents. For some known special cases (for example, cases with no interfacial resistance), the present solution reduces to the previous works of other investigators.Keywords
This publication has 19 references indexed in Scilit:
- Absorption of ozone in aqueous solutions with self‐decomposition effectToxicological & Environmental Chemistry, 1995
- Modeling of an ozone-wastewater system's kineticsWater Research, 1989
- Interfacial resistance in exothermic gas absorption with chemical reactionThe Chemical Engineering Journal, 1988
- The effect of interfacial resistance on gas absorption with chemical reaction: The film theory modelJournal of the Chinese Institute of Engineers, 1987
- Effect of surface resistance on gas absorption accompanied by a chemical reaction in a gas—liquid contactorThe Canadian Journal of Chemical Engineering, 1985
- Ozone Mass Transfer in Stirred VesselOzone: Science & Engineering, 1984
- Mass transfer in ozone absorption. An approximate analytical equation is derived for predicting the enhancement of mass transfer by decomposition and ozanation reactionsEnvironmental Progress, 1982
- Kinetics of ozone decomposition: a dynamic approachEnvironmental Science & Technology, 1982
- The Mass Transfer of Ozone into Water: Energy Requirements-State of the ArtOzone: Science & Engineering, 1981
- The effect of surface active agents on interphase mass transferAIChE Journal, 1970