Method of removing impurities from hard waters or waters with si

Details Method of removing impurities from hard waters or waters with si Method of removing impurities from hard waters or waters with si

1987-06-19

1989-11-21

Fisher, Richard V.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210674, 210687, 210695, 210711, 210713, B01D 1504, C02F 502

Patent

active

048820644

ABSTRACT:
A method for removing suspended impurities and colored substances from water which is hard and/or has a pH in excess of 5 which comprises contacting the water at its natural pH with a coagulant/adsorbent which comprises a finely divided particulate mineral material, the individual particles of which have a thin hydroxylated surface layer having a positive zeta potential at the adsorption pH, and separating the thus treated water from the coagulant/adsorbent.

REFERENCES:
patent: 3142638 (1964-07-01), Blaisdell et al.
patent: 3887498 (1975-06-01), Kuhajer et al.
patent: 4083782 (1978-04-01), Kunin
patent: 4094778 (1978-06-01), Denny et al.
patent: 4216086 (1980-08-01), Lang
patent: 4279756 (1981-07-01), Weiss et al.
Standard Methods, Hardness, Thirteenth Edition, pp. 178-179, American Public Health Association.
Environmental Science and Technology, vol. 7, No. 1, Jan. 1973 (Article by S. R. Jenkins entitled Effect of Selected Cation Concentration on Coagulation and Adhesion to Silica Surfaces of .differential.--MnO.sub.2.
Aquatic Chemistry, An Introduction Emphasizing Chemical Equilibria in Natural Waters, Wiley and Sons, p. 478.
Fine Particles Processing, vol. 1, Proceedings of the International Symposium for Fine Particles Processing, Las Vegas, 1980, published by Amer. Institute of Mining, Metallurgical, and Petroleum Engineers, Inc., 1980.

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