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1. (WO1979000765) ROTARY DRUM FILTER AND METHOD OF OPERATION FOR MEDIUM CLEANING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000765 International Application No.: PCT/US1979/000166
Publication Date: 04.10.1979 International Filing Date: 13.03.1979
IPC:
B01D 33/00 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
33
Filters with filtering elements which move during the filtering operation
Applicants:
Inventors:
Priority Data:
88683615.03.1978US
Title (EN) ROTARY DRUM FILTER AND METHOD OF OPERATION FOR MEDIUM CLEANING
(FR) FILTRE A TAMBOUR ROTATIF ET SA METHODE DE NETTOYAGE
Abstract:
(EN) A rotary vacuum filter wherein each filtration sector (11) of the filter is backwashed with filtrate and/or separately supplied gas or wash liquid while the sector is submerged in the feed slurry in the tank. As each sector starts to resurbmerge in the tank, vacuum is applied so that the sector and associated hydraulic system is quickly and completely filled with filtrate and a thin cake or film f solids forms on the filter medium (13) whereupon with the sector still submerged, vacuum is cut off and a positive pressure is applied by either or both pressured gas or liquid supplied through the valve (14) thus forcing filtrate back through the cloth to effect washing thereof. After the wash, vacuum is reapplied for cake formation. The drum (3) includes an internal manifold (17) under each filtration sector. The manifolds are mounted on the interior wall of the drum and are secured directly to the drum wall as structural members. Additionally, each manifold serves as a reservoir for storage of wash liquor.
(FR) Filtre a aspiration rotatif dans lequel, chaque unite de filtration (11) du filtre est lavee a contre-courant avec le filtrat et/ou separement avec du gaz ou du liquide de lavage pendant que l"unite est immergee dans la pate dans le reservoir. Lorsque chaque unite commence a s"immerger de nouveau dans le reservoir, on exerce une aspiration pour que l"unite et le systeme hydraulique associe se remplisse rapidement et completement de filtrat et qu"un gateau mince ou une couche de particules solides se forme sur l"element filtrant (13) puis, l"unite etant toujours immergee, on stoppe l"aspiration et on applique une pression positive par l"intermediaire du gaz et/ou liquide de pression dont l"alimentation se fait par la vanne (14), forcant ainsi le filtrat a repasser a travers le filtre pour en effectuer le lavage. Apres lavage, on exerce a nouveau une aspiration pour former le gateau. Le tambour (3) comprend un collecteur interne (17) sous chaque unite de filtration. Les collecteurs sont montes sur la paroi interne du tambour et sont fixes directement sur celle-ci en tant qu"elements faisant partie de la structure. De plus, chaque collecteur sert de reservoir pour le stockage de la liqueur de lavage.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)