Ballasting digestor covers

Details Ballasting digestor covers Ballasting digestor covers

1981-05-29

1983-07-05

Castel, Benoit

Liquid purification or separation

With means to add treating material

Directly applied to separator

210DIG9, 220216, 220227, 422184, 435167, 435287, 435801, C02F 1104

Patent

active

043917054

ABSTRACT:
A digestor includes a tank and an inverted dish-shaped cover, the lower end of which extends into sludge contained within the tank. The cover is ballasted by a number of ballast members which resemble tubs and which are integrally formed of concrete. Each ballast member is mounted with its cavity facing upwardly so that the ballast cavities automatically fill with sludge upon start-up of the digestor. When partially surfaced above the sludge, the predetermined total weight of sludge in the ballast members causes a substantial increase in the pressure exerted by the cover on the contained gas than would be exerted by the cover and unfilled ballast members.

REFERENCES:
patent: 3187897 (1965-06-01), Walker
patent: 3288295 (1966-11-01), Kelly
patent: 3298670 (1967-01-01), Crom
patent: 3535236 (1970-10-01), Travis
patent: 4166791 (1979-09-01), Marvin
patent: 4230580 (1980-10-01), Dodson
patent: 4274838 (1981-06-01), Dale et al.

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