Coagulation/flocculation technique

Details Coagulation/flocculation technique Coagulation/flocculation technique

1993-07-02

1995-09-19

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210738, C02F 152

Patent

active

054513286

ABSTRACT:
Aggregate-forming suspensions containing a coagulant therefor, e.g., FeCl.sub.3, polyaluminum chloride or Al.sub.2 (SO.sub.4).sub.3, are coagulated/flocculated by stirring to provide mechanically strong flocs of greater average diameter size, without concomitant formation of irreversible microflocs, and wherein the stirring regime, in at least the initial stage of coagulation/flocculation, includes an initial operating stirring cycle comprising (i) a rapid stirring sequence at an average velocity gradient ranging from 300 to 1,000 s.sup.-1 for a period of time ranging from 30 to 200 seconds, and (ii) a slow stirring sequence at an average velocity gradient ranging from 40 to 100 s.sup.-1 for a period of time ranging from 5 to 40 minutes.

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Database WPIL, Section Ch, Week 9131, Derwent Publications Ltd., London, GB; Class A97, AN 91225264 & HU-A-55 705 (Dunantuli Regionali) 28 Jun. 1991.
Patent Abstracts of Japan, vol. 13, No. 105 (C-575)13 Mar. 1989 & JP-A-63 278 509 (Ebara Infilco Co Ltd) 16 Nov. 1988.

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