DK145795B - WASHER TO REMOVE COMPONENTS SUSPENDED IN A CASE - Google Patents

Description

in 145795

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a liquid cleaning apparatus for removing components suspended in a liquid from the liquid which has an open basin of substantially rectangular shape and provided at one end with means for introducing a stream of the fluid to be treated in the basin and having nozzle means disposed at said introducer means for introducing a gas / liquid mixture into the liquid stream, said mixture being fed to the nozzle means through a duct from a pressure pump adapted to produce a gas / liquid mixture, which is saturated at the outlet side of the pump which is provided with a relief valve disposed between the pump and the nozzle means in such a way that a gas / liquid mixture containing small air bubbles is fed to the basin through the nozzle means to promote flotation purification by attaching said bubbles to suspended components, which apparatus is further provided with means for removing components, which is separated by flotation through an outlet, as well as with a discharge to remove the treated liquid.

For liquid purification, it is known to use a gas / liquid mixture which is supplied to nozzle means in such a manner as to produce small air bubbles to promote flotation purification by adherence between said bubbles and suspended components. In this connection, reference should be made to the description of Austrian Patent No. 311,276. According to this prior art, one or more pressure vessels are provided at the bottom 25 of a slender, tapered container, to whose bottom is fed the said gas / liquid mixture which, after passing through an annular space provided with ribs, flows from the annular space at the bottom of the container to flow up through the slender, tapered container.

The flotation-separated sludge flows around an assault at the upper end of the container and flows into a gutter from which it is removed by means of a conduit. The purified liquid is withdrawn at an extended portion of the container through a drain pipe. The air bubbles that are included from the suspended components and that for the purified liquid will largely be followed up through the slender container.

It is the object of the present invention to provide a rapid separation between the air bubbles and the adhering components thereof from the other part of the liquid, and this is achieved by the liquid introducing means comprising a supply chamber defined by an upwardly sloping wall. which together with a present sidewall of said basin forms a substantially triangular space in which the nozzle means 5 and a supply channel for the liquid to be treated are disposed in the vicinity of the lower part of the triangular space in such a manner, providing a substantially vertical flow of liquid, which inclined wall is directed toward the outlet disposed near the opposite end of the basin, and which wall further forms a boundary wall relative to a separation compartment. By virtue of the substantially vertical fluid flow according to the invention, the constituents which are secreted by flotation will rapidly move up to the surface of the liquid in the basin for removal through the outlet and the remaining portion of the liquid will move along the upwardly inclined wall to flow into the separation compartment, thereby providing a rapid separation by flotation.

According to one embodiment of the liquid apparatus, according to the invention, a plate separator 20 may be arranged. flow for substantially downward flow, and this separator may constitute a discharge opening for purified liquid. In this way, effective cleaning is also obtained for components that are separated by sedimentation.

According to one embodiment of the apparatus, the nozzle means can be rotatable upon application of the gas / liquid mixture, thereby obtaining that the gas / liquid mixture can be given the optimum direction according to the prevailing conditions.

According to a further embodiment of the invention, a baffle plate may be arranged over the nozzle means for supplying the gas / liquid mixture. This results in an intimate mixing of the air bubbles and the liquid to be cleaned of the flotation components.

The apparatus of the present invention can advantageously be used in the case where the liquid to be treated is subjected to a coalescence treatment, namely if the coalescence apparatus of the invention is placed in the supply chamber over the supply channel of the liquid to be treated, and the nozzle means for supplying the gas / liquid mixture ..

The invention will now be explained in more detail with reference to the drawing, in which fig. 1 is a schematic view of an embodiment of the liquid cleaning apparatus according to the invention; FIG. 2 is a simplified view of a supply nozzle for this apparatus; and FIG. 3 shows another embodiment of a part of this apparatus.

In the drawing, 1 denotes a basin which is divided by a side wall 2 into a supply chamber 3 and a discharge chamber 4.

A partition 5 constituting an assault delineates in the basin 1 an outlet in the form of a discharge chamber 6 for the separated particles which can flow away over the assault 5. A plate assembly 7 which. forming a separation compartment, resting on a sloping wall 8 in the basin 1, and the lower end of the upper wall 9 of this unit adjoins the side wall 2, so that the side wall 2 and the inclined upward wall 9 form a largely triangular space. The lower end of the discharge chamber 4 runs together with a sediment outlet 10, and means (not shown) for discharging the purified liquid are connected to the discharge chamber 4 at its upper end.

The liquid to be treated is supplied through insertion means having a channel 11 which opens into a channel in the form of a nozzle 12 located in the triangular space 3 formed between the side wall 2 and the upper wall of the assembly 7 9. This nozzle 12 may advantageously be formed as a pipe extending 25 transversely along the full width of this space 3, and provided with a longitudinal slot, which may be shaped in particular so as to ensure a uniform spraying of the liquid. . Any already separated swimming particles will immediately be raised to the surface of the liquid in the chamber 3, which liquid will then flow further through the plate assembly 7, separating remaining, swimming and possibly also precipitating particles. The liquid purified for these components then flows upwardly into the chamber 4 and discharges as the sediment slides down from the plates 7 of the aggregate 7 and into the sediment outlet 10. The swimming particles slide upward along the plates and will flow on the liquid in the chamber 3.

Under the nozzle 12, a second nozzle 13 is connected to a duct 14. In this duct 14 a relief valve 15 is disposed and the duct 14 leads to the pressure side of a compression pump 16. At the suction side of this pump, there is 145795 4. connected to a duct 17, by which liquid can be sucked in from the discharge chamber 4. furthermore, an air duct 18 in the duct 17 opens, in order to suck in air from the surroundings which is mixed into the liquid.

This air is thoroughly mixed with the liquid in the pump 16, which is generally a centrifugal pump, and any air bubbles occurring are broken by the impeller blades of the pump. The pump 16 is capable of providing considerable pressure, e.g. of 0.5 ... 1 N / mm2, in the duct 14 in front of the relief valve 15.

Taking into account static pressure differences, it may at times be advisable to insert an auxiliary pump into the air duct 18 to introduce air under a certain pressure into the liquid. The pressurized fluid, which contains a significant amount of air, and is particularly saturated therewith, is suddenly relieved after valve 15, resulting in a supersaturated state which manifests itself in a more or less colloidal distribution of small air bubbles which These bubbles rise and mix with the fluid introduced through the nozzle 12 into this space, and the air bubbles will adhere to the particles suspended therein, thus becoming lighter and penetrating. to the liquid surface.

In FIG. 2 shows an embodiment of the nozzle 13 which extends along substantially the entire width of the chamber 3 and is provided with a longitudinal slot 19 through which the supplied liquid can be dispensed. In order to obtain a uniform distribution of the penetrating liquid, this gap is designed to converge in the flow direction. The insertion nozzle 12 may also be configured in this way. In a particularly advantageous embodiment, the slot 19 will be directed downwardly to provide a better distribution of the developed air bubbles, which can be further aided by placing a guide plate 20 over the nozzle 13. It is also possible to make the nozzle 13 rotatable about its own axis. to allow any adjustment of the outflow direction. The guide plate 20 may also be adjustable, and it is also possible to place this plate in another location, e.g. over the nozzle 12.

FIG. 3 shows another embodiment in which air is supplied at the pressure side of the pump 18 by means of an additional pump 21 which provides the necessary pressure. In this way, better saturation with air can also be obtained. As the air supply is thereby no longer passed through the liquid pump, additional mechanisms will generally be provided to destroy the air bubbles. For this purpose, a mixing container 22 with a built-in stirrer 23 is inserted in the duct 14, which can be reduced with the air bubbles. In a particular embodiment, it is possible to design this container 22 as a buffer container in which the liquid can be stored for a certain amount of time, which promotes mixing. Such a buffer container can also be used in the embodiment of FIG. First

It may sometimes be advantageous to expose the liquid previously supplied through the channel 11 to a coalescence or coalescence treatment to produce some particle growth. A number of appliances are already known for use in this treatment.

Such a coalescence or waxing apparatus may also be placed in the triangular space between the side wall 2 and the upper wall 9. In this case, the injection of the air-liquid mixture will take place at the inlet end of this waxing apparatus. Furthermore, this can also take place in a waxing apparatus 20 located on the outside of the actual separating apparatus.

Furthermore, it is also possible to use only one injection nozzle, whereby the channels 11 and 14 are connected to each other before the common nozzle, and it is also possible to use a mixing nozzle, where e.g. one nozzle encloses the other of the nozzles 12,13.

In a particular embodiment of the invention, a simple nozzle can be used if the liquid to be treated is pressurized and mixed with air in the pump 16, and the duct 17 will then be coupled to the liquid supply vessel. This is only possible if the solution is of such a nature that the pump 16 30 and the relief valve 15 are not substantially clogged or if this can be done without any nuisance.

Instead of air, any other gas can also be supplied. In some cases, the liquid to be treated contains a gas or substance which is very volatile at the common temperature so that no separate gas is needed if this liquid is pressurized.

Furthermore, it is possible to add additional substances which promote the separation or particle growth at any location in the above-mentioned channel. It is clear that one is providing

Claims (2)

145795 of the gas-liquid mixture can also use a liquid which does not originate from the system itself, provided that this liquid is compatible with the other liquids. Thus, e.g. waterworks water is used when the suspension carrier liquid is water. In the manner described above, it has become possible to significantly improve the separation of particles which are usually difficult to separate. Claims. A liquid cleaning apparatus for removing components suspended in a liquid from the liquid, said apparatus having an open basin (1) of substantially rectangular shape and provided at one end with means (11,12) for introducing a stream of the liquid to be treated into the basin and having nozzle means (13) disposed at said insertion means (11, 12) for introducing a gas / liquid mixture into the liquid stream, which mixture is fed to the nozzle means (13 ) through a channel (14) from a pressure pump (16) adapted to produce a gas / liquid mixture saturated at the outlet side of the pump (16), which channel (14) is provided with a relief valve (15) which is disposed between the pump (16) and the nozzle means (13) in such a way that a gas / liquid mixture containing small air bubbles is passed to the basin (1) through the nozzle means (13) to promote flotation purification by attachment of said bubbles and suspended components, which apparatus further are provided with means for removing components separated by flotation through an outlet (6) and with a discharge for removing the treated liquid, characterized in that the liquid introducing means comprises a supply chamber (3) defined by by means of an upwardly sloping wall (9) which together with a present side wall (2) rf said basin 30 forms a substantially triangular space in which the nozzle means (13) and a supply channel (12) for the liquid to be treated, is disposed in the vicinity of the lower part of the triangular space in such a manner as to provide a substantially vertical flow of liquid, which inclined wall (9) is directed towards the outlet (6) located near the opposite end of the basin, and which wall (9) further forms a boundary wall relative to a separation section (7). Purifier according to claim 1, characterized by (