Removal of Toluene from Air Using PAC/Water Slurry Reactor
Publication: Journal of Environmental Engineering
Volume 115, Issue 5
Abstract
A bench‐scale, continuous, stirred‐tank reactor is used to study the removal of a volatile organic compound, toluene, from air through absorption into water and subsequent adsorption onto powdered activated carbon in the reactor. Both steady and unsteady state data are used to calibrate and test a mathematical model, which is based on gas transfer at the gas/liquid interface, diffusional resistance in the boundary layer around activated carbon particles, and diffusional resistance through activated carbon pores. The model is solved numerically using the orthogonal collocation method on finite elements. Both the steady and unsteady state data are described well with the model. The experimental and modeling results show that the removal of toluene from air is greatly enhanced by adding activated carbon to the scrubbing water. The presence of activated carbon lowers dissolved toluene concentrations and thus maintains a high driving force for toluene absorption into water. The effect of carbon pore diffusion is found to be appreciable. The value of the effective diffusivity that gives the best fit for both steady state and unsteady state data is which is on the same order of magnitude with the bulk diffusivity.
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References
1.
Aris, R. (1975). The mathematical theory of diffusion and reaction in permeable catalysts, Oxford University Press, London, England, 23.
2.
Carey, G. F., and Finlayson, B. A. (1975). “Orthogonal collocation on finite elements.” Chem. Engrg. Sci., 18(5/6), 587–596.
3.
“Control techniques for volatile organic emissions from stationary sources.” (1978). EPA‐450/2‐78‐022, Office of Air and Waste Mgmt., Office of Air Quality Planning and Standards, U.S. E.P.A., Research Triangle Park, N.C.
4.
Cussler, E. L. (1984). Diffusion, mass transfer in fluid systems. Cambridge Univ. Press, Cambridge, England, 230–231.
5.
Finlayson, B. A. (1980). Nonlinear analysis in chemical engineering. McGraw‐Hill Book Co., New York, N.Y.
6.
Fukada, T., et al. (1981). “Carbon adsorption/solvent recovery using activated carbon fibers.” Proc. AIChE Conference, New Orleans, La.
7.
Gear, C. W. (1971). Numerical initial value problems in ordinary differential equations. Prentice‐Hall, Englewood Cliffs, N.J.
8.
Hindmarsh, A. C. (1974). “GEAR: Ordinary differential equation system solver.” Report UCID‐30001, Revision 3, Lawrence Livermore Lab., Livermore, Calif.
9.
Kim, B. R., et al. (1978). “Analysis of models for dichloramine removal by activated carbon in batch and packed‐bed reactors using quasilinearization and orthogonal collocation methods.” Water Res., 12(5), 319–326.
10.
Kim, B. R., and Snoeyink, V. L. (1980). “The monochloramine‐activated carbon reaction: A mathematical model solved using the orthogonal collocation method on finite elements.” Activated carbon adsorption of organics from the aqueous phase, Vol. I, I. Suffet and M. McGuire, eds., Ann Arbor Science Publishers, Ann Arbor, Mich., 463–481.
11.
Kim, B. R., Snoeyink, V. L., and Saunders, F. M. (1976). “Adsorption of organic compounds by synthetic resin.” J. Water Pollut. Control Fed., 48(1), 20–133.
12.
Levenspiel, O. (1972). Chemical reaction engineering. John Wiley & Sons, Inc., New York, N.Y., 476.
13.
Liapis, A. I., and Rippin, D. W. T. (1978). “The simulation of binary adsorption in activated carbon columns using estimates of diffusional resistance within the carbon particles derived from batch experiments.” Chem. Engrg. Sci., 33(5), 593–600.
14.
Mills, W. B., et al. (1982). “Water quality assessment: A screening procedure for toxic and conventional pollutants. Part 1.” EPA‐600/6‐82‐004a, Envir. Protection Agency, Washington, D.C.
15.
“Pulverized activated carbons.” Calgon Tech. Bulletin, Calgon Corp., Pittsburgh, Pa., 23–100b.
16.
Rich, L. G. (1961). Unit operations of sanitary engineering. John Wiley & Sons, Inc., New York, N.Y., 178.
17.
Snoeyink, V. L., Weber, W. J., Jr., and Mark, H. B. (1969). “Sorption of phenol and nitrophenol by active carbon.” Environ. Sci. Technol., 3(10), 918–926.
18.
Standard methods for the examination of water and wastewater. (1985). 16th Ed., Amer. Public Health Assoc., Amer. Water Works Assoc., and Water Pollut. Control Fed., Washington, D.C.
19.
Suidan, M. T. (1975). “Reduction of aqueous free chlorine with granular activated carbon,” thesis presented to the University of Illinois, at Urbana, Ill., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
20.
Thacker, W. E., Snoeyink, V. L., and Crittenden, J. C. (1981). “Modeling of activated carbon and coal gasification char adsorbents in single‐solute and bisolute systems.” UILU‐WRC‐81‐0161, Water Resour. Ctr., Univ. of Illinois, Urbana, Ill.
21.
Wilke, C. R., and Chang, P. C. (1955). “Correlation of diffusion coefficients in dilute solutions.” AIChE J., 1(2), 264.
22.
Yurteri, C., et al. (1987). “The effect of chemical composition of water on Henry's law constant.” J. Water Pollut. Control Fed., 59(11), 950–956.
Information & Authors
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Published In
Journal of Environmental Engineering
Volume 115 • Issue 5 • October 1989
Pages: 1025 - 1045
Copyright
Copyright © 1989 ASCE.
History
Published online: Oct 1, 1989
Published in print: Oct 1989
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