Abstract

An arrangement for removing liquid from a sludge comprises a filter (3) having at least one filter surface (4) configured to filter a said sludge by retaining dry substance of the sludge thereonto and letting liquid substance of the sludge pass through. Means (8) is configured to spray a liquid onto sludge present on said filter surface (4) so as to spread out the sludge over the filter surface. Means (9) are configured to keep the filter surface (4) substantially horizontally during said spraying so as to utilize the gravitation for obtaining passing of liquid substance through the filter surface and by that for said removal of liquid from the sludge.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• B01D 33/15 - Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
• B01D 33/58 - Handling the filter cake in the filter for purposes other than for regenerating

Abstract

An arrangement for filtrating a rough-filtrated sludge comprises a filter body (1) with a tubular shape and a casing (2) receiving said filter body therein while forming a filter space (3) separating circumferential walls of the casing from the filter body. The casing and the filter body are arranged with their circumferential walls directed substantially vertically. Said sludge is fed from below through a bottom of the casing into said filter space. The gravitation is utilized for obtaining passing of liquid substance of the sludge through the filter body into a central space of the casing and out through the bottom of the casing.

IPC Classes  ?

• C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
• B01D 29/15 - Supported filter elements arranged for inward flow filtration
• B01D 29/68 - Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles