Dewatering of sewage sludges on chamber filter presses

Details Dewatering of sewage sludges on chamber filter presses Dewatering of sewage sludges on chamber filter presses

1981-10-02

1983-10-25

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210738, 210769, 210784, 210806, C02F 154, C02F 1114

Patent

active

044117973

ABSTRACT:
A process for dewatering sewage sludges, the dewatering characteristics of which have been improved by adding an organic flocculant, on a chamber filter press, wherein the greater part of the water in the flocculated sludges is removed by gravity filtration in a process step upstream of the chamber filter press, without application of a pressure difference, and the actual pressure filtration, on the chamber filter press, is only then carried out.
In principle, commercial products can be used as the organic flocculant. These are water-soluble, macromolecular compounds which have been obtained by polymerization or copolymerization of acrylamide, acrylic cid and/or their salts, or of esters of acrylic acid or methacrylic acid with specifically modified alcohol components.

REFERENCES:
patent: 3279603 (1966-10-01), Busse
patent: 3300403 (1967-01-01), Kehoe
patent: 3342731 (1967-09-01), Baumann
patent: 3531404 (1970-09-01), Goodman et al.
patent: 4158627 (1979-06-01), Ingemarsson
patent: 4159684 (1979-07-01), Kirkup
patent: 4192743 (1980-03-01), Bastgen et al.
Savage et al., "Sludge Dewatering With Filter Belt Presses" Presented at Tech. Conf. On New Advances in Sep. Tech., New York, 10/75, pp. 1-12.
Process Design Manual For Sludge Treatment And Disposal, U.S. EPA, Technology Transfer, Oct. 1974.
Parkhurst et al., "Dewatering Digested Primary Sludge," JWPCF, vol. 46, No. 3, Mar. 1974, pp. 468-487.
Jones et al., "The Economics Of Energy Usage & Recovery In Sludge Disposal" 49th Annual Conf. WPCF, Oct., 6, 1976 pp. 1-17.
Gas Wasserfach, Wasser/Abwasser, 118, 1977, p. 429.
Schlammbehandlungs-und-Beseitigung-Sanlagen, Technische, Mitteilungen, vol. 65, No. 9, 1972, p. 432.
Thomas, "The Use Of Filter Presses For The Dewatering Of Sludges," JWPCF, Jan. 1971, pp. 93-101.
Degremont Handbook, Bauverlag, GmbH, Wiesbaden, 1974, Berlin, DE, pp. 449-450.

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