Limestone Contactors: Steady‐State Design Relationships
Publication: Journal of Environmental Engineering
Volume 117, Issue 3
Abstract
Limestone contactors can mitigate corrosion in small water‐supply systems that use dilute, acidic water. As water is transported through a packed bed of crushed limestone, dissolves and the pH, calcium‐ion concentration, and alkalinity increase. Operation of a contactor can be effectively modeled by considering the rate of dissolution and interfacial transport of calcium ions. The steady‐state model developed and tested in this study relates the depth of limestone required in the contactor to the desired effluent water chemistry, influent water chemistry, limestone‐particle size and shape, bed porosity, water temperature, and superficial velocity. The magnitude of the rate constant that describes the release of calcium ions from the calcite surface varies with the pH at the particle surface. When this pH is less than about 9.5, the rate constant for the surface reaction becomes large, and the rate of dissolution tends to be controlled solely by the transport of calcium ions away from the interface.
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References
1.
Barton, P., and Vatanatham, T. (1976). “Kinetics of limestone neutralization of acid waters.” Envir. Sci. Tech., 10(3), 262–266.
2.
Chu, I., Kaill, J., and Wetteroth, W. A. (1953). “Mass transfer in fluidized beds.” Chem. Engrg. Prog., 49(3), 141–149.
3.
Cussler, E. L. (1984). Diffusion: Mass transfer in fluid systems. Cambridge University Press, Cambridge, U.K., 101–105.
4.
Gran, G. (1952). “Determination of the equivalence point in potentiometric titrations.” Int. Cong. Anal. Chem., 77(1), 661–671.
5.
Hadad, M. (1986). “Modeling of limestone dissolution in packed‐bed contactors treating dilute acidic water,” thesis presented to Syracuse University, at Syracuse, N.Y., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
6.
Herman, J. S. (1982). “The dissolution kinetics of calcite, dolomite, and dolomitic rocks in the ‐water system,” thesis presented to Pennsylvania State University, at University Park, Pa., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
7.
Letterman, R. D., Driscoll, C. T., Hadad, M., and Hsu, H. A. (1986). “Limestone bed contactors for control of corrosion at small water utilities.” Water Engineering Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, Ohio.
8.
Levenspiel, O. (1972). Chemical reaction engineering. John Wiley & Sons, New York, N.Y.
9.
“Manual on test sieving methods.” (1972). ASTM‐STP447A, ASTM, Philadelphia, Pa.
10.
Pearson, F. H., and McDonnell, A. J. (1975a). “Limestone barriers to neutralize acidic streams.” J. Envir. Engrg. Div., ASCE, 101(3), 425–440.
11.
Pearson, F. H., and McDonnell, A. J. (1975b). “Use of crushed limestone to neutralize acid wastes.” J. Envir. Engrg. Div., ASCE, 101(1), 139–158.
12.
Plummer, L. N., and Bussenberg, E. (1982). “The solubility of calcite, aragonite, and veterite in solutions between 0 and 90° C and an evaluation of the aqueous model for the system .” Geochim. Cosmochim. Acta, 46, 1011–1040.
13.
Powell, M. J. D. (1965). “A method for minimizing a sum of squares of non‐linear functions without calculating derivatives.” The Comput. J., 7, 303–307.
14.
Rickard, D., and Sjoberg, E. L. (1983). “Mixed kinetic control of calcite dissolution rates.” Am. J. Sci., 283, 815–830.
15.
Robinson, R. A., and Stokes, R. H. (1959). Electrolyte solutions. Butterworth, London, U.K.
16.
Satterfield, C. (1980). Heterogeneous catalysis in practice. McGraw‐Hill Book Co., New York, N.Y.
17.
Sherwood, T. K., Pigford, R. L., and Wilke, C. R. (1975). Mass transfer. McGraw Hill, New York, N.Y.
18.
Sjoberg, E. L., and Rickard, D. (1983). “The influence of experimental design on the rate of calcite dissolution.” Geochim. Cosmochim. Acta, 47, 2281–2285.
19.
Sjoberg, E. L., and Rickard, D. (1984). “Calcite dissolution kinetics: Surface speciation and the origin of variable pH dependence.” Chem. Geol., 42, 119–136.
20.
Slavin, W. (1968). Atomic absorption spectroscopy. John Wiley Interscience, New York, N.Y.
21.
Snoeyink, V. L., and Jenkins, D. (1980). Water chemistry. John Wiley & Sons, New York, N.Y.
22.
Standard methods for the examination of water and wastewater. (1985). 16th Ed., American Public Health Association, Washington, D.C.
23.
Stumm, W., and Wollast, R. (1990). “Coordination chemistry of weathering: Kinetics of the surface‐controlled dissolution of oxide minerals.” Rev. Geophys., 28(1), 53–69.
24.
Vaillencourt, G. W. (1981). “Crushed limestone neutralization of dilute acidified Adirondack surface waters,” thesis presented to Cornell University, at Ithaca, N.Y., in partial fulfillment of the requirements for the degree of Master of Science.
25.
Westall, J. C., Zachary, J. L., and Morel, F. M. (1976). “MINEQL: A computer program for the calculation of chemical equilibrium composition of aqueous systems.” TN‐18 Parson Laboratory, Massachusetts Institute of Technology, Cambridge, Mass.
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Copyright © 1991 ASCE.
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Published online: May 1, 1991
Published in print: May 1991
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