Sludge Freezing in Shallow Layers
Publication: Journal of Environmental Engineering
Volume 116, Issue 3
Abstract
The effect of freeze-thaw conditioning for enhanced sludge dewatering is effective only when sludge freezes completely and slowly. This recognition has inhibited the development of commercialized freeze-thaw conditioners. If sludge is frozen in thin layers, however, the freezing can be slow, complete, and fairly rapid. The studies reported here suggest that the freezing rate can be assumed to be only a function of the temperature and the convection coefficient, and that the insulating effect of the ice can be ignored.
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References
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Corte, A. E. (1963). “Vertical migration of particles in front of a moving freezing plane.” CRREL Research Report 105, U.S. Army Cold Regions Res. and Engrg. Lab., Hanover, N.H.
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Ezekwo, G., Tong, H.‐M., and Gryte, C. C. (1980). “On the mechanisms of dewatering colloidal aqueous solutions by freeze‐thaw processes.” Water Res., 14(8), 1079–1088.
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Glen, J. W. (1974). The physics of ice. U.S. Army Cold Regions Res. and Engrg. Lab., Hanover, N.H.
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Knocke, W. (1988). “The role of the floc size and density in defining activated sludge thickening characteristics.” Fundamental aspects of sludge characterization and dewatering, P. A. Vesilind, ed., Engrg. Found., New York, N.Y.
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Martel, C. J. (1988). “Development and design of sludge freezing beds,” presented to the University of Colorado, at Boulder, Colo., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 116 • Issue 3 • May 1990
Pages: 646 - 650
Copyright
Copyright © 1990 ASCE.
History
Published online: May 1, 1990
Published in print: May 1990
Authors
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