Liquid purification or separation – Diverse distinct separators – Including a filter
Patent
1996-05-21
1997-12-16
Reifsnyder, David A.
Liquid purification or separation
Diverse distinct separators
Including a filter
210295, 2105321, 210538, B01D 2900, C02F 140
Patent
active
056980990
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus or equipment for separating solids from a liquid/solid mixture.
Our British Patent Application No. 9223079.6 (and corresponding International Patent Application No. PCT/GB93/01100) relate to an apparatus for separating solids from a liquid/solid mixture comprising:
(i) a barrier comprising a series of generally parallel longitudinal elements which define between them openings to permit flow of liquid through the barrier, each of the said elements, over a substantial portion of its length, having a cross-section comprising an enlarged head region having a smooth arcuate surface which narrows to a restricted lower body portion, the longitudinal elements additionally defining an upper surface of the barrier onto which, in use, the liquid mixture for separation is introduced, the said upper surface of the barrier being downwardly inclined towards a free edge which extends along at least one side of the barrier, which downward inclination is chosen such that solids retained on the barrier are washed down the surface by the liquid mixture as it is introduced onto the surface; and
(ii) a solids collection region provided below the said free edge of the barrier for collecting solid matter washed down the inclined upper surface of the barrier.
This prior art apparatus may be connected to the overflow of a hydro-dynamic separator in order to separate from the liquid phase emerging from the separator those neutrally buoyant materials which escape separation.
According to a first aspect of the present invention, there is provided a hydro-dynamic separator incorporating a solids interceptor upstream of the overflow for intercepting solid matter above a predetermined size entrained in liquid flowing towards the overflow, the solids interceptor comprising:
(a) a wall terminating in an upper edge which constitutes a weir in the flow path of liquid flowing to the overflow;
(b) a barrier, extending from the said wall towards a solids collection region, said barrier comprising a plurality of openings to permit flow of liquid therethrough but to retain solids, the upper surface of the barrier being disposed such that solids retained on the barrier are washed across the surface by the flow of liquid towards the solids collection region; and
(c) a liquid collection region beneath the barrier for collecting liquid flowing through the openings in the barrier, said liquid collection region being in fluid communication with the overflow of the separator.
The barrier is preferably in the form of an annulus. This annular barrier may be arranged such that flow across the barrier surface is either radially inward or radially outward.
When the flow is to be radially outward, the said wall is an inner peripheral wall and flow emerges centrally of the annular barrier and passes over the wall onto the barrier thereby washing solids towards a solids collection region in communication with an outer, downstream edge of the barrier. This solids collection region may be in the form of an annular channel disposed around the downstream edge of the barrier and leading to an outlet which conveys the solids and associated liquid away from the separator; the floor of the annular channel may be sloped towards the outlet thereof. The solids collected may be dewatered in a conventional dewatering device such as a so-called "Franclon screen" as described in GB-A-2247186.
When the flow is to be radially inward, the wall is provided as an outer peripheral wall from which the barrier extends inward towards a central solids collection region. The outer peripheral wall may be a continuous circular wall, or may be a part circular wall. The central solids collection region may comprise a simple opening which communicates with a downwardly extending duct for the continuous disposal of the collected solids. Alternatively, the solids collection region may communicate with a receptacle which is emptied periodically.
The upper surface of the barrier may be downwardly inclined towards the solids collection region and the angle of i
REFERENCES:
patent: 4801377 (1989-01-01), Bolt
PTO 96-5903: Translation of Geramn Document DE 42 37 201 A1, May 1994.
Fagan Garry William
Lamb Timothy John
Hydro International plc
Reifsnyder David A.
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