Liquid purification or separation – With means to add treating material – Directly applied to separator
Patent
1998-11-05
2000-07-04
Lithgow, Thomas M.
Liquid purification or separation
With means to add treating material
Directly applied to separator
2102211, 210522, C02F 124
Patent
active
060833890
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a flotation plant, particularly for treating waste waters, which comprises an intake installation, a flocculation section, a laminating section composed of a plurality of equiaxial divergent circular-section members, a separating section, a water discharge installation, a sedimentation section, a slurry collecting section, a scraper for the slurry, a trough for the slurry and pushers for conveying the same.
In patent U.S. Pat. No. 4,931,175 to Krofta a Water Clarifying Apparatus is disclosed having a cylindrical tank where particulate contaminants suspended in raw water are separated using flotation techniques. A set of concentric mutually spaced, conical plates are positioned in the flotation tank. The plates rotate about the tank, preferably in unison with (i) a header that distributes equal quantities of raw water to each annular zone in the tank defined by the conical plates and (ii) a scoop for removing the contaminants which form a floated sludge layer.
It is a drawback of the known apparatus that the plates constituting a laminating section, i.e. a main section of the apparatus, rotate. Namely, the rotating assembly is submersed; no approach is possible in order to maintain e.g. the bearings, which means that special bearings or special lubricating arrangements are required.
Besides, the known apparatus operates by the decompressing of air dissolved in water. To this end, a portion of clarified water must be returned into the process. Approximately 30 to 40% of the capacity of the apparatus is involved thereby, which results in respective reduction of the efficiency and increase of energy consumption.
It is an object of the present invention to avoid the disadvantages of the prior art and to provide a flotation plant creating a uniform flow pattern of a fluid through all its passages in a continuous operation, preferably a laminar flow pattern of the fluid downstream from the intake chamber of the plant.
According to this invention, a laminar flow pattern is obtainable under the following conditions.
The laminating section is arranged to form, on the one hand, mutually equal base areas and, on the other hand, mutually equal exit areas of the respective annuli.
The exit areas of the laminating section are 1.4 times larger than the base ones.
The base i.e. intake areas of the annuli of the laminating section all reside in a horizontal plane, and the upper i.e. exit areas of the annuli of the laminating section are arranged to form a hemisphere.
The laminating section is supported by an intake vessel. The intake vessel of the flocculating section and the outer divergent member of the laminating section form a uniform divergent member.
A bottom member of the intake vessel and a bottom member of a flotation cistern are integral and arranged in a common horizontal plane.
The total exit area of the laminating section equals the mantle surface of a virtual cylinder defined by the largest diameter of the laminating section and by the height clearance between the laminating section at the location of the said largest diameter and the upper edge of the cistern.
The total exit area of the laminating section also equals an intake gap of an annulus in the horizontal plane between the laminating section and the cistern.
The cistern provides an upper, cylindrical part and a lower, funnel-shaped part with the connection site between the said two parts being located at a level approximately corresponding to a half of the height of the flocculating section.
A horizontal annulus area at the location corresponding to the connection site of the cylindrical part and the funnel-shaped part of the cistern is 1.5 times larger than the horizontal annulus area of the intake gap existing between the laminating section and the cistern.
In the height region approximately corresponding to the connection site between the two parts of the cistern, a floccule-free water discharge collecting installation is arranged, which is composed of a torus-type tube arranged around the cistern, said tube being co
REFERENCES:
patent: 3828935 (1974-08-01), Rovel
patent: 4931175 (1990-06-01), Krofta
patent: 5268099 (1993-12-01), Krofta et al.
patent: 5296149 (1994-03-01), Krofta
patent: 5660718 (1997-08-01), Chudacek et al.
Lithgow Thomas M.
Susa Janez
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