Method and apparatus for reducing the thickness of a precoat layer of a disc filter

摘要

Method and apparatus for reducing the thickness of a precoat-layer (57) accumulated on the filtering surface (56) of a filter disc (12) from a solids-containing suspension in a basin (40) of a disc filter, said disc filter having two or more filter discs arranged on a shaft (10) and between them at least one drop chute (38) provided with a scraper (20) on both sides, which scraper (20) scrapes the cake filtered from the suspension on the filtering surfaces (56) of the filter discs (12) into the drop chute (38), by means of which scraper (20) the layer thickness of the precoat (57) on the filtering surface (56) is reduced by shortening the distance between the tips of the scrapers (20) and the filtering surface (56) and the precoat (57) thickness reduction is accomplished for the precoats (57) on the filtering surface (56) of the two filter discs (12) on both sides of the drop chute (38) non- simultaneously.