Process for dewatering sludges

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

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210734, 210735, 210738, C02F 1114

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active

044798792

ABSTRACT:
A process for dewatering aqueous sludges of organic nature by adding to the sludge a cationic organic flocculant to effect a first stage agitation of vigorous intensity, and then adding thereto an anionic organic flocculant to perform a second stage agitation of mild intensity and subjecting the thus formed flocs to a dewatering operation, which process comprises the use of a cationic organic flocculant composed of any combination of A- and B-components, wherein the A-component consists of one or more polymers selected from the group consisting of A.sub.1 - and A.sub.2 -components, in which the A.sub.1 -component consists of polymers having a structural unit of vinylimidazoline or partially hydrolyzed products thereof and the A.sub.2 -component consists of Hofmann-degradation products of polymers having a structural unit of acrylamide or methacrylamide, and the B-component consists of one or more polymers selected from the group consisting of synthetic water-soluble cationic polymers other than the polymers of the A-component.

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patent: 3826787 (1974-07-01), Capozza
patent: 3835046 (1974-09-01), Restaino
patent: 4007200 (1977-02-01), Panzer et al.
patent: 4382864 (1983-05-01), Hashimoto et al.

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