Method of water treatment using zeolite crystalloid coagulants
AssigneeSortwell & Co., part interest
InventorLeo E. Nagan
Life of this patent
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Abstract
A method of coagulating particulates, as in papermaking or water clarification applications, for example, is provided wherein a zeolite crystalloid coagulant is added to water containing the solid matter, a source of multivalent cations, and a cationic acrylamide polymer. The zeolite crystalloid coagulant is preferably prepared by admixing aqueous sodium silicate and sodium aluminate solutions to form a reaction mixture and allowing a reaction to proceed for a sufficient time to form a zeolite crystalloid coagulant particles having particle sizes of at least about 4 nm before terminating the reaction.
Claims30
A method of treating water to coagulate particulate matter contained therein, said method comprising the sequential steps of:
- (a) providing an aqueous suspension comprising particulate matter with multivalent cations adsorbed on the surface of said particulate matter;
- (b) optionally, adding a source of multivalent cations to said suspension of step (a);
- (c) optionally, adding to said suspension of (a) or (b) a cationic polyacrylamide;
- and,
- (d) adding to said suspension of (a), (b), or (c) a sodium or potassium zeolite crystalloid coagulant (ZCC) having particle sizes of at least about 4 nm, said ZCC having a weight ratio of aluminum to silicon in the range of about 0.72:1 to about 1.3:1, said suspension having sufficient respective amounts of said multivalent cations and said ZCC to effect coagulation of said particulate matter by ion exchange between said adsorbed cations and the sodium or potassium present in said ZCC.
A method of clarifying water in water clarifying apparatus to remove particulate matter from the water, said method comprising the steps of:
- (a) providing an influent stream to the water clarifying apparatus containing the particulate matter with multivalent cations adsorbed on the surface of said particulate matter;
- (b) optionally, adding a source of multivalent cations to said stream of step (a);
- (c) optionally, adding to the stream of step (a) or step (b) a cationic polyacrylamide;
- and,
- (d) adding a sodium or potassium zeolite crystalloid coagulant (ZCC) having a particle size of at least about 4 nm and a weight ratio of aluminum to silicon in the range of 0.72:1 to about 1.3:1 to said stream of step (a) or step (b) or step (c), said stream having sufficient respective amounts of said multivalent cations and said ZCC to effect coagulation of said particulate matter by ion exchange between said adsorbed cations and the sodium or potassium present in said ZCC.
Dependencies are inferred from the claim text.