Patent ID: 6190561
Filing Date: 2001-02-20
Classification: B01D,B01J,C02F,D21H

Abstract:
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.