Liquid purification or separation – Processes – Chemical treatment
Patent
1992-11-20
1995-06-20
Lithgow, Thomas M.
Liquid purification or separation
Processes
Chemical treatment
210767, 210804, 210806, 210295, 210316, 210406, 210446, 210482, 210488, 2104931, 210507, 68 1213, B01D 2500, B01D 2907, B01D 2944, B01D 3908
Patent
active
054258820
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for removing dirt particles (with and without oil depositions) from water or from waste water without free oil, in particular waste water which occurs in commercial laundries after the washing of garments, work clothes and the like.
FIELD OF THE INVENTION
Waste water which occurs in commercial laundries involves the problem of treatment, the objective being to treat the water to the extent that it can be discharged into the public sewer system in compliance with the applicable governmental regulations.
DESCRIPTION OF THE RELATED ART
A number of methods are known which can be employed in this connection, to mention only a few, they are electroflotation, evaporation, flocculation, ultrafiltration, and the like. In each of these methods, there are essentially three disadvantages which manifest themselves. They require the use of additional chemicals, so that after the chemicals have been employed, a specialized waste product must be disposed of. The utilization of energy, whether for heating, warming or stirring, results in increased additional costs of water treatment. And lastly, the high cost of instrumentation, which for certain methods is exceedingly high.
SUMMARY OF THE INVENTION
In connection with the treatment of waste water, the present invention deals specifically with the problem of removing the solids and dirt particles from the waste water in such a manner that only a small proportion of special waste is obtained, which moreover can be transported or burned without a problem.
This is achieved with the aid of the apparatus of the present invention and the respective method, which will be described hereinafter.
An essential feature of the present invention must be seen in that the textiles present inside the apparatus according to the invention are oriented essentially so that the warp and woof threads of the textiles extend in the flow direction of the water, rather than being arranged transversely, as would be done in the case of a sieve. In principle, therefore, the present invention involves a trickle filter where textile material is charged in a special orientation.
The possibility exits of increasing the flow of the waste water through the tank of the apparatus of the present invention by applying pressure, although allowing the waste water to run through without additional pressure is the best procedure from the viewpoint of energy conservation. Tests have shown that the removal of the waste water by applying suction from below, under elevated pressure, gives better results than pressurizing from the inlet side.
Of special importance for the present invention is the provision of a barrier in the drain zone, to prevent the water from getting to the drain along the wall of the tank.
Tests in connection with the present invention have further demonstrated that heavy metal can be at least partially removed from the waste water by means of the apparatus according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained below by way of an example with reference to the drawing.
FIG. 1 shows a perspective view of an apparatus according to the invention;
FIG. 2 shows details of the drain zone of another apparatus than shown in FIG. 1, on a larger scale, in transverse section.
DESCRIPTION OF THE PREFERRED EMBODIMENT
10 denotes a tank which an be used in connection with the present invention. The tank has an inlet opening 11, through which the waste water can be introduced. The inlet opening 11 can be closed tightly. In the lower region of tank 10 there is a drain sieve 13, so that through a drain line 12 purified water, which is substantially clean, although it may have a yellowish color, can run off.
14 denotes a layer of filling of textiles in the form of garments, which are loosely folded and form a kind of filter. Essential in this connection is that the textiles form a relatively large surface, on which the soiled water can run off or trickle down. Significant, however, is that on the uppe
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Boco GmbH & Co.
Lithgow Thomas M.
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