Liquid purification or separation – Structural installation – Flume stream type
Patent
1992-07-28
1994-04-05
Upton, Christopher
Liquid purification or separation
Structural installation
Flume stream type
210159, 210160, 210393, 210400, B01D 3304
Patent
active
053002210
DESCRIPTION:
BRIEF SUMMARY
A filter arrangement is known, where a disc-shaped filter fabric in a first, lower zone is submerged in a liquid current which is to flow through the filter and where the filter fabric in a second, upper zone above the liquid current can have the deposited filter material removed. By having the filter fabric alternately submerged in and raised upwardly from the liquid current whicn is to be filtered, one has the possibility of ensuring a more or less continuous flow of liquid through the filter fabric, at the same time as filter material deposited on the filter fabric is separately removed in a correspondingly more or less continuous operation.
The filter fabric in a known filter arrangement, which is used especially in connection with the treatment of sea water or fresh water, which is to be employed for example as fresh water for fish breeding purposes, is fixed in a circular frame and is rotatable about a shaft at the center of the frame. Gradually as the flow of liquid passes through the portion of the circular filter fabric submerged in the current or liquid, during rotation of the filter fabric in the current of liquid, material which is to be filtered off from the current of liquid, is deposited on the filter fabric in its submerged, lower zone and is thereafter continuously removed from the upper zone of the filter fabric which is uncovered above the flow of liquid. A filter arrangement of the afore-mentioned kind is restricted for use in relatively protected conditions and covers therefore no application under more robust conditions outside in nature or under conditions where the filter arrangement is unmanned and thereby more or less left to itself under normal operation.
As a result of the rotation of the filter fabric across the direction of flow, materials accompanying the current of liquid, which are to be filtered off, have a tendency to be led correspondingly across the current of liquid along the rotating filter, so that one gets an upward concentration of such material mainly at the one side of the flow of current. The result is a gradually increasing collection of such material in a local region of the current of liquid at one side edge of the liquid flow. This can in turn result in the loading on the filter fabric becoming undesirably great in local regions of the filter fabric and in general it can be difficult to effect transfer of such material to a sufficient degree from the current of liquid to the filter fabric, as a consequence of blocking of the flow of water in front of the filter fabric. The efficiency of the filter fabric thereby becomes less than intended. Especially large and rigid objects, such as wooden sticks or the like, or clumps or similar collections of particles, which are not drawn upwardly into the path of movement of the filter fabric, have a tendency to gather up in front of the filter fabric and block the free through flow of liquid through the filter fabric. In addition, supporting or strengthening the filter fabric, so that it can tolerate the loading from the material in front of the filter fabric, can create problems. The filter fabric can especially be exposed to fracture produced by wooden sticks or similar objects which are accidentally carried along by the flow of liquid.
In EP-A-0 108 717 is shown a filter mechanism for a flow channel box. This mechanism comprises a conveyor belt, partially submerged in the flow channel box, rotating between upper and lower rollers. The filter, which is transporting filtered material to a further transport arrangement extending transversley of the filter and away from the flow channel box, is adjustable in obliquely upwards extending directions by pivotation of the filter about an upper horizontal axis. Liquid passing through the filter is passed out of the flow channel box in a separate conduit directly through the filter.
Briefly, the invention is directed to a filter arrangement which employs a transport chute or similar guide means for conveying a flow of liquid therethrough for filtering purposes. In addition, the
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Hand Francis C.
Upton Christopher
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