FI68213B - AVSKILJARE FOER FOERORENINGAR VILKA FLYTER I VAETSKA - Google Patents

Description

· Luht '! NOTICE A0917 ™ (11) utlAggningsskrift ooZjo C Patent issued 12 OC 1985

Patent applications (51) Kv.lk. * / Lnt.CI. «C 02 F 1/1 * 0 // B 01 D 17/032, E 02 B 15/01 * FINLAND —FINLAND (21) Pwenttihakemui - Patenttmöknfng 7911 * 1 * 5 (22) Application date — Ansökningsdag Qii Qc 70 (Fh -3./5 '* (23) Starting date - Glltighetsdag 0l *. 05.79 (41) Made public - Bllvlt offentlig 06.1 1. 79

National Board of Patents and Registration Date of publication | -, n

Patent- och registerstyrelsen '' Ansökan utlagd och utl.skrlften publicerad · 04.05 (32) (33) (31) Privilege requested — Begird priority 05.05.78 Hungary-Hungary (HU) MO-1013 (71) Mirköz Diesel £ s HiJtötechn i ka i Cooperative, 1 * 9 / B, Köbänyai-ut,

Budapest X, Hungary-Hungary (HU) (72) Ferenc Somogyi, Budapest, Alajos Horva, Budapest, Hungary-Hungary (HU) (?! *) Oy Koi ster Ab (51 *) Separator for floating impurities in the liquid -Avskiljare för föroreningar The present invention relates in particular to a separator for the removal of impurities floating in liquids having a lower specific gravity than the above-mentioned liquid, preferably for the treatment of oily effluents. The separator is expediently contained in an elongate container with liquid inlets and outlets, provided with a separator device with a separator knife mounted on the floats and inclined at an acute angle to the horizontal, with nozzles having an orifice facing the separator knife and in each case with an outlet.

A problem that occurs permanently in many industries is the removal of floating contaminants from different fluids from different technologies. The rapid increase in environmental pollution has paid particular attention to the treatment and, taking into account economic considerations, the recovery of industrial waste water. Floating impurities 2 6821 3 and other by-products in the liquid state in industrial effluents can be divided into two groups according to the liquid to be treated, namely substances with a higher specific gravity and those with a lower specific gravity than the liquid in question. Further division is possible according to the solid or liquid state of the floating substance.

Several processes and equipment for separating substances of different state, specific gravity and grain size are known. Separate or combined implementation of precipitation, centrifugation and filtration processes is usually an energy consuming task, which necessitates the diversion of large amounts of material, precipitators requiring the lowest amount of energy, the highest filtration factor and the lowest set-up and operating costs are usually used alone or combined with other technological devices as required in each case.

The detrimental feature of known precipitators - especially if the liquid to be cleaned contains both higher and lower specific gravity impurities, as in the most common case where industrial effluents contain both sand and oil impurities - is that the equipment has to adapt to conflicting requirements.

In the most widely used technical structures, in different settling and separation basins, on the one hand, wastewater must flow as a laminar flow at a minimum speed to allow sand grains to settle to the bottom and allow oil droplets to rise to the surface at least at a speed that makes the difference effective. Obviously, these two requirements are practically impossible to implement at the same time, which is why only a compromise is possible.

Another condition which in practice impairs the fulfillment of both of the above two requirements is that the load of the effluent is by no means uniform and its variation li '3 68213 is impulsive. However, these impulsive variations, on the one hand, interfere with the image of the discharged and discharged flow and cause wave effects, especially on the surface, but also deeply stirring the thus already settled grains and finally the liquid surface in the pool fluctuates continuously so that the separating component sometimes hangs freely any separation or wave that sweeps into the component just on the surface, fills the exhaust duct with water and degrades the separation efficiency or even prevents the separation.

To solve these problems, Hungarian Patent No. 169,472 provides a solution in which the separating device is placed on floats and provided with at least one row of nozzles while the peeling knife blade is adjusted to or below the interface of the effluent to be treated and the contaminants raised on it.

The only detrimental feature of this known solution relates to the "quality" of the separated impurity, as it always also contains a small amount of liquid to be purified. In practice, the blade of the peeling knife cannot be adjusted exactly to the interface, whereas when the peeling knife is immersed in the liquid to be cleaned, the oil always brings some water into the collecting channel.

The object of the present invention is to provide a solution which makes it possible to completely separate a "clear" impurity which contains only a hint of a liquid to be purified.

This object is solved according to the invention in that the separating knife is fluidly connected at its end away from the steel to the upper edge of the open separator housing, that the upper edge of the separator housing is above the elevated impurity layer, but an outlet pipe connected to the flexible, the mouth of which is above the respective upper surface of the liquid to be cleaned and below the upper surface of the elevated impurities generated in the separator housing.

4 6821 3

The invention will now be described with reference to a drawing of a suitable embodiment, given by way of example. In the drawing, part of the equipment is shown in schematic longitudinal section.

Appropriately for the flow direction of the liquid to be cleaned, a peeling device for floats 2 equipped with a peeling knife 3 is arranged at the rear of the elongated oval basin 1. At least one row of nozzles 4 is arranged in front of the peeling knife 3.

The rear edge of the peeling knife 3 is connected in a liquid-sealing manner from the bottom to the front flange of the open separator housing 5 with respect to the flow direction. The bottom shape of the separator housing may be optional, suitably a rectangle, the shorter sides of which are attached to the floats 2. The upper flange of the separator housing 5 extends above the liquid surface, while its lower flange penetrates deep into the liquid to be cleaned.

In this case, the separator housing 5 is completely open at the bottom, but within the scope of the invention it can also be manufactured in such a way that the base plate is provided with at least one opening. The essential requirement is that the interior of the separator housing 5 and the basin 1 must be in contact with each other.

At least one outlet pipe 6 is arranged inside the separator housing 5, which in this case is connected via a corrugated metal pipe 7 to an outlet projection 8 intended for impurities. An adjusting ring 8 is screwed into the thread developed in the mouth of the outlet pipe 6 shown in the drawing.

It should be noted that the adjusting ring 9 can also be mounted on the outlet pipe 6 in some other way.

Other components not shown in the hardware drawing, such as e.g. the feed profile, the precipitator outlet protrusion, which is intended for impurities with a higher specific gravity, has been developed or can be developed in accordance with Hungarian Patent No. 169,472, including the possibility of connection to a complete technological cleaning line. The operation of the apparatus according to the invention will now be described.

the oil-contaminated industrial effluent fed to the basin 1 moves as a laminar flow, while the oil rises to the surface and a higher specific gravity impurity precipitates in the meantime.

The contaminant layer 11 floating on the surface 10 of the liquid to be cleaned is driven as a forced flow to the peeling knife 3 embedded under the surface 10 by means of a gas, especially air discharged from the nozzles 4. Arrows 12 and 13 indicate the flow rate of the liquid and layer 11 to be cleaned.

Due to the trouble-free and correct operation of the apparatus, the peeling device must be adjusted so that the peeling knife is immediately below the surface 10 of the liquid to be cleaned, while the outlet of the discharge pipe 6 and the upper level of the adjusting ring 9 must be somewhat above it.

The essence of the operation of the device according to the invention and its decisive advantage is that the liquid to be cleaned entrained with its impurity, which is forced to flow into the separator housing 5, precipitates from the impurity, so only "clear" impurity containing at most traces of cleaning liquid enters the outlet.

The accuracy of the separation and peeling can be regulated and controlled by adjusting the peeling knives 3 on the one hand and the adjusting ring 9 on the other hand in two steps.

Finally, a control test is described as an example in which fuel oil is poured into a 2.2 x 4.0 m basin with 5.28 m3 of resting water. With the help of the device according to the drawing, 28.5 l of fuel oil could be separated, while about 0.2 l of fuel oil remained on the surface of the water in the separator housing.

When the separated fuel oil was burned in a household oil fireplace, no deviation from which the presence of water could have been inferred was not observed.

Claims (2)

6 6821 3 A separator for liquids floating in a liquid having a lower specific gravity than a liquid, preferably for the treatment of oily effluents, which separator is suitably in an elongate tank with a liquid inlet and outlet, inclined at an acute angle to the floats (2). a separating device with a separating knife (3) with nozzles (4) with the mouth opening directed towards the separating knife (3) and in addition with a discharge outlet (8) for impurities, characterized in that the separating knife (3) is connected at its end away from the steel with the upper edge of the separator housing (5) open from the bottom, that the upper edge of the separator housing (5) is above the raised contaminant layer (11) but its lower edge is deep in the liquid to be cleaned and that at least one flexible outlet (8) is mounted inside the separator housing (5) a combined outlet pipe (6) with an orifice o n above the respective upper surface (10) of the liquid to be cleaned and below the upper surface of the elevated impurities generated in the separator housing (5). Separator according to Claim 1, characterized in that an adjusting ring (9) is arranged in the outlet pipe (6), preferably screwed.