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Flocculation and Coagulation of Ca- and Mg-Saturated Montmorillonite in the Presence of a Neutral Polysaccharide

Published online by Cambridge University Press:  28 February 2024

L. G. Fuller ,
Tee Boon Goh ,
D. W. Oscarson  and
C. G. Biliaderis
L. G. Fuller
Affiliation:
Department of Soil Science, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
Tee Boon Goh
Affiliation:
Department of Soil Science, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
D. W. Oscarson
Affiliation:
AECL Research, Whiteshell Laboratories, Pinawa, Manitoba R0E 1LO, Canada
C. G. Biliaderis
Affiliation:
Department of Food Science, Aristotle University, Thessaloniki 54006, Greece
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Abstract

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The objective of this study was to observe flocculation of montmorillonite in the presence of a glucose polymer (dextran) and to observe the effect of saturating cation and coagulant addition on the flocculation process. Flocculation of montmorillonite was dependent on polymer molecular weight, polymer/clay ratio (w/w), nature of exchangeable cation, and ionic strength of the suspension to which the polymer was added. The T500 dextran (molecular weight = 5 × 105) caused enhanced sedimentation of Ca-montmorillonite suspension at a polymer/clay ratio of ≤0.01. Increasing the polymer concentration above this level stabilized the suspension such that sedimentation was less than or equal to that of the control. The T2000 dextran (molecular weight = 2 × 106) caused a similar increase in the sedimentation of Ca-montmorillonite at polymer/clay ratios of <0.1. The ability of the T2000 polymer to cause flocculation at greater polymer/clay ratios as compared to the T500 polymer was attributed to the lower osmotic pressure between clay particles for equal concentrations of the two polymers. Flocculation of Ca-montmorillonite by dextran was enhanced when the clay had initially been coagulated by the addition of salt. Reduction of the diffuse double layer upon addition of salt permitted the polymer to extend beyond the electrostatic barrier of the clays. Dextran was not able to flocculate Mg-montmorillonite suspensions with or without the presence of coagulant. The displacement of water molecules at the clay surface rather than within the hydration shell of the more highly polarizing Mg cations by polymer segments resulted in a greater polymer collapse on the clay surface leaving fewer and shorter polymer loops and tails available for contacting adjacent clay particles.

Keywords

CoagulationDextranExchangeable cationFlocculationMontmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 5 , October 1995 , pp. 533 - 539
Copyright
Copyright © 1995, The Clay Minerals Society

References

Chenu, C., Pons, C. H., and Robert, M. 1987. Interaction of kaolinite and montmorillonite with neutral polysaccharides. Denver: Proc. Intl. Clay Conf., 375–381.Google Scholar
Clapp, C. E., Davis, R. J., and Waugaman, S. H. 1962. The effect of rhizobial polysaccharides on aggregate stability. Soil Sci. Soc. Am. Proc. 26: 466–469.Google Scholar
Clapp, C. E., Olness, A. E., and Hoffman, D. J. 1968. Adsorption studies of a dextran on montmorillonite. Trans. 9th Int. Congr. Soil Sci., Adelaide, Vol. 1, Angus and Sydney: Robertson, 627–637.Google Scholar
Clapp, C. E., and Emerson, W. W. 1972. Reactions between Ca-montmorillonite and polysaccharides. Soil Sci. 114: 210–216.Google Scholar
Dowdy, R. H., and Mortland, M. M. 1967. Alcohol-water interactions on montmorillonite surfaces. Clays & Clay Miner. 15: 259–271.Google Scholar
Heil, D., and Sposito, G. 1993. Organic matter role in illitic soil colloids flocculation: I. Counter ions and pH. Soil Sci. Soc. Am. J. 57: 1241–1246.Google Scholar
Fuller, L. G., and Goh, Tee Boon. 1992. Stability-energy relationships and their application to aggregation studies. Can. J. Soil Sci. 72: 453–466.Google Scholar
Fuller, L. G., Goh, Tee Boon, and Oscarson, D. W. 1995. Cultivation effects on dispersible clay of soil aggregates. Can. J. Soil Sci. 75: 101–107.Google Scholar
Lafuma, F., Wong, K., and Cabane, B. 1991. Bridging of colloidal particles through adsorbed polymers. J. Colloid Interface Sci. 143: 9–21.Google Scholar
LaMer, V. K., 1966. Coagulation symposium introduction J. Colloid Sci. 19: 291.Google Scholar
Martin, J. P., 1971. Decomposition and binding action of polysaccharides in soil. Soil Biol. Biochem. 3: 33–41.Google Scholar
Martin, J. P., and Richards, S. J. 1969. Influence of the copper, zinc, iron, and aluminum salts of some microbial and plant polysaccharides on aggregation and hydraulic conductivity of Ramona sandy loam. Soil Sci. Soc. Am. Proc. 33: 421–423.Google Scholar
Olness, A., and Clapp, C. E. 1975. Influence of polysaccharide structure on dextran adsorption by montmorillonite. Soil Biol. Biochem. 7: 113–118.Google Scholar
Parfitt, R. L., and Greenland, D. J. 1970a. The adsorption of poly(ethylene glycols) on clay minerals. Clay Miner. 8: 305–315.Google Scholar
Parfitt, R. L., and Greenland, D. J. 1970b. Adsorption of polysaccharides by montmorillonite. Soil Sci. Soc. Am. Proc. 34: 862–866.Google Scholar
Rennie, D. A., Truog, E., and Allen, O. N. 1954. Soil aggregation as influenced by microbial gums, level of fertility and kind of crop. Soil Sci. Soc. Am. Proc. 18: 399–403.Google Scholar
Theng, B. K. G., 1979. Formation and properties of clay-polymer complexes. Developments in Soil Science Volume 9. Amsterdam: Elsevier Scientific Publishing Company, 362 pp.Google Scholar
Theng, B. K. G., 1982. Clay-polymer interactions: Summary and perspectives. Clays and Clay Miner. 30: 1–10.Google Scholar
Tisdall, J. M., and Oades, J. M. 1982. Organic matter and water-stable aggregates in soils. J. Soil Sci. 33: 141–163.Google Scholar