SK91199A3 - Device for stirring and aerating a liquid and eliminating the foam in a vat for treating this liquid - Google Patents

Abstract

The invention concerns a device for stirring and aerating a liquid and eliminating the foam in a vat for treating this liquid. The device comprises a vertical casing (11) extending over part of the height of the vat (1), a funnel (14) arranged around the upper part of the casing (11), a first series of windows (17) provided in the upper part of the casing (11), a second series of windows (18) provided in the casing (11) above the base of the funnel (14), a vertical shaft (19) arranged inside the casing (11), a helix (20) fixed at the free end of the shaft (19), beneath the base of the funnel (14), an anti-vortex device (24) arranged inside the casing (11), beneath said helix (20), means (25) for regulating the level of liquid in the funnel (14) and means (33) for injecting pressurised gas in to the casing (11). The invention is applicable for instance to the treatment of greasy waste extracted from urban effluents of waste water or of agro-industries.

Description

EQUIPMENT FOR MIXING AND BLEEDING LIQUID AND FOR REMOVING TANK IN TANK FOR LIQUID PROCESSING

Technical field

The invention relates to an apparatus for mixing and aerating liquids and for removing foam in a liquid treatment tank or container, such as fatty waste products extracted from an urban sewage outlet or from the agricultural food industry.

BACKGROUND OF THE INVENTION

It is known that urban sewage effluent from sewage pipes such as sewage is collected in sewage treatment plants where they are subjected to various treatment operations for treatment prior to introduction into the natural environment.

Such purification processes produce by-products such as fats and sludges.

Landfills are increasingly less inclined to receive products of this type, so sewage plants must now process them and, if possible, limit them.

The fats trapped at the inlet of the sewage plants are poured into treatment tanks, such as a biodegradation tank, which has a mechanical stirrer for mixing the liquid.

Further, the tank may have an internal injector manifold at the bottom for injecting air under pressure into the aeration liquid and to promote mixing.

Such an aeration and mixing device is particularly suitable for liquids which are only slightly contaminated, i.e. of low viscosity, and whose efficiency decreases rapidly for liquids loaded mainly by fats.

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During the treatment of liquids, such as fatty waste products, in devices of this type, a layer of foam is formed on the liquid surface which drains and pollutes the environment, so that means are required to remove the floating liquid foam during processing.

Heretofore, such means have been agitators placed on the liquid surface and adapted to flatten the foam.

However, these stirrers are not fully satisfactory and some of the foam will escape and pollute the environment.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome these drawbacks by designing liquid mixing and aeration devices such as greasy waste products extracted from urban sewage or the agro-food industry, which can efficiently process liquids of this type and eliminate floating foam at low energy. liquid.

SUMMARY OF THE INVENTION

Apparatus for mixing and aerating a liquid and for removing foam in a tank when processing liquid, the inside of the tank being

- a vertical casing extending to a part of the height of the tank and having at least a first channel and a second channel providing liquid inlet at the top and at least a second liquid discharge opening near the bottom of the tank,

- an upwardly facing funnel around the upper part of the vertical shell and connected to the vertical shell, the upper edge of the upside-down funnel defining a free space for the flow of liquid with the tank wall,

- a main propeller inside a vertical mantle near the bottom of an upside-down funnel,

- a propelling rotating vertical shaft extending inside the vertical housing above the main propeller which is driven by the vertical shaft,

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- the first anti-virus device inside the vertical shell below the main propeller,

injecting the gas injected under pressure into the vertical shell area under the anti-viral device, according to the invention, that the first anti-viral device is located inside the vertical shell a static mixer consisting of a vertical pipe and a static septum for stirring the liquid by turbulence.

According to other features of the invention is

- insulated tank,

- the device comprises means for regulating the flow of liquid and for drawing the foam through the propeller inside the vertical shell,

- the apparatus comprises means for influencing static mixing by the cavitation of the liquid within the vertical shell and arranged below the antiviral means within the vertical shell,

the apparatus comprises means for controlling the flow of liquid and foam drawn by the first housing positioned around the vertical housing at the level of the group of first channels and a second housing positioned around the vertical housing at the level of the group of second channels, .

- the apparatus comprises means for controlling static mixing by cavitation, formed both by a vertical pipe inside the vertical shell and extending from the bottom of the tank to the anti-vortex means, and by vertical barriers located inside the vertical shell and fixed to the pipe,

- the apparatus comprises second anti-vortex means located inside the vertical shell and above the main propeller, the second anti-vortex means comprising at least two vertical plates, each of which protrudes upwardly through the ribs up to the upper end of the vertical housing,

- the device includes a fluid accelerator inside the vertical shell,

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- the device has means for aerating the level inside the tank,

- the apparatus comprises a vortex pump for sucking the surface of the liquid inside the vertical housing, located at the level of the group of first channels,

- the device has a single flow propeller for sucking liquid inside the vertical shell, located above the second anti-viral means and at the level of the group of first channels,

the apparatus comprises a two-flow propeller for sucking liquid within the vertical housing, located above the second anti-viral means and at the level of the group of first channels.

The invention is illustrated, but not limited, by the following examples.

Swap the figures in the drawings

In FIG. 1 is a schematic cross-sectional view of a liquid treatment tank in a first embodiment of an apparatus for mixing and aerating a liquid.

In FIG. 2 is a sectional view of FIG. First

In FIG. 3 is a schematic cross-sectional view of a liquid treatment tank in a second embodiment of the liquid mixing and aeration apparatus of the invention.

In FIG. 4 is a sectional view taken along line 4--4 of FIG. Third

In FIG. 5 is a schematic partial cross-sectional view of a third embodiment of a device according to the invention for mixing and aerating a liquid.

In FIG. 6 is a schematic cross-sectional view of a fluid accelerator of the present invention for mixing and aerating a liquid.

In FIG. 7 is a schematic cross-sectional view of the liquid level aeration means.

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In FIG. 8 is a partial schematic cross-section of a fourth embodiment of a device according to the invention for mixing and aerating a liquid.

In FIG. 9 is a schematic view to a larger scale of a vortex pump of a fourth embodiment of the device according to the invention.

In FIG. 10 is a sectional view 10-10 of FIG. 9th

In FIG. 11 is a partial schematic cross-sectional view of a fifth embodiment of an apparatus for mixing and aerating a liquid.

In FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 11th

In FIG. 13 is a partial schematic cross-sectional view of a sixth embodiment of a device according to the invention for mixing and aerating a liquid.

In FIG. 14 is a section 14-14 of FIG. 13th

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1a 3 shows a tank 1 or a drum provided at the upper end with an inlet 2 for the liquid 3 to be treated, such as effluents extracted from municipal sewage.

In its upper part, the tank 1 is provided with insulation 4 and comprises a mixing device 10 for mixing and aerating the fluid 5 and for removing the foam.

The mixing device 10 according to the invention, located in the tank 1, consists of a vertical casing 11 extending into a part of the height of the tank 1.

The upper end 11a of the vertical shell 11 is closed by the plate 12 and the lower part of the vertical shell 11 is open and defines a liquid outlet 13 at the bottom of the tank 1.

Third

The mixing device 10 is further formed by an upside-down funnel 14, the upper end of which, together with the wall of the tank 1, defines a free space 15 for fluid flow 3 and whose lower edge is connected to the vertical housing 11 at a distance from the upper end of the vertical housing 11.

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The assembly comprising the vertical housing 11 and the upwardly facing funnel 14 is fixed within the tank 1 by suitable means, for example struts 16, which define between them the flow rates for the liquid 3.

In the vertical shell 11, a plurality of first channels 17 are evenly distributed around the circumference of the vertical shell 11 and positioned at the level of the liquid within the upwardly facing funnel 14.

The vertical sheath 11 is further provided with a plurality of second channels 18 equally spaced around the periphery of the vertical sheath 11 and positioned at the bottom of the upwardly facing funnel 14.

The diameter of the main propeller 20 is slightly smaller than the inside diameter of the vertical shell H.

The vertical shaft 19 and the main propeller 20 are driven by an engine speed regulator unit 21 mounted on a plate 12 closing the upper end of the vertical housing 11.

The mixing device 10 is provided with a device controlling the flow of liquid and foam drawn by the main propeller 20 inside the vertical shell 11 by a group of first channels 17 and a group of second channels 18.

These control devices comprise, on the one hand, a first housing 22 enclosing the vertical housing 11 at the level of the group of the first channels 17, and a second housing 23 enclosing the vertical housing 11 at the level of the group of the second channels 18.

The position of the first housing 22 relative to the plurality of first channels 17 and the second housing 23 relative to the plurality of second channels 18 is adjustable in the vertical direction by suitable (not shown) terminals.

Inside the vertical housing 11, a first anti-vortex device 24 is located below the main propeller 20 to prevent the liquid 3 from rotating in the vertical housing 11.

As shown in FIG. 2, this anti-vortex device 24 comprises three vertical plates 24a distributed 120 ° within the vertical housing 11.

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The mixing device 10 is also provided with means for regulating the level of the liquid 3 in the upturned funnel 14, by means of which the overflow pipe 25 inside the upturned funnel 14 is adjustable in a vertical position.

In the second embodiment shown in FIG. 3, the mixing device 10 forms a device 30 for influencing static mixing by cavitation of the liquid 3 inside the vertical shell 11, located below the first anti-vortex device 24 in the vertical shell 11.

As shown in FIG. 3 and 4, the apparatus 30 for influencing static mixing by cavitation of liquid 3 consists, on the one hand, of a vertical tube 31 inside the vertical shell H extending from the bottom of the tank 1 to below the first anti-viral device 24 and secondly arranged one another. of the jacket 11 and mounted on a vertical tube 31.

The vertical tube 31 is suitably anchored at the bottom of the tank 1.

The static partitions 32, together with the inner wall of the vertical shell 11, define a passageway for circulating the liquid.

As shown in FIG. 3, the static partitions 32 are arranged around the vertical tube 31, below the first anti-swirl device 24, and at the bottom of the vertical casing 11.

For example, the vertical tube 31 carries two static bulkheads 32 on top of the first anti-swirl device 24, and two static bulkheads 32 on top of the vertical casing 11.

The static partitions may also be 32 evenly distributed over the entire portion of the vertical tube 31 located within the vertical casing 11.

In the embodiment of FIG. 3, the static partitions 32 are suppositories, the concave part of which is directed towards the bottom of the tank 1. According to another variant, the static partitions 32 may be disc-shaped.

The mixing device 10 has injection means 33 for injection under pressure of a gas, such as air, into the vertical shell 11.

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The injection means 33 comprise at least one tube 34 which is opened into the vertical housing 11, for example at a level below the static partitions 32 at the top of the vertical tube 31.

The described device works as follows:

The liquid to be treated 3 is poured through the inlet 2 into the tank j. up to the level of the upper edge of the upside-down funnel 14. This liquid 3 is also poured into the upside-down funnel 14.

The engine speed regulator unit 21 rotates the vertical shaft 19 to rotate the main propeller 20.

At the same time, air is forced into the vertical casing 11 by pressure 34 under pressure.

By rotating the main propeller 20, liquid 3 is started to be sucked into the vertical shell 11 through the first channels 17 and the second channels 18, so that the liquid 3 continuously circulates from top to bottom of the vertical shell 11, then penetrates through the liquid outlet 13 and circulates from bottom to space. between the vertical shell 11 and the inner wall of the tank 1, and this is repeated.

The first anti-vortex device 24 prevents rotation of the liquid in the vertical shell 11 below the main propeller 20.

The level of the liquid 3 in the upside-down funnel 14 is below the level of the liquid in the tank 1 and this level of the liquid in the upside-down funnel 14 is regulated by the overflow tube 25 so that it is still substantially in the middle of the group of first channels.

17th

Further, due to the suction effect of the main propeller 20 inside the vertical shell 11, the liquid level in the vertical shell 11 is below the level of the liquid in the upside-down funnel 14.

The air blown into the interior of the vertical housing 11 by rotating the main propeller 20 and the pressurized gas injected into the vertical housing 11 generates gas bubbles that disperse in the liquid 3 within the vertical cylinder 11 by rotation of the main propeller 20.

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During the circulation of the liquid 3 in the vertical shell 11, a cavitation phenomenon is created under each static partition 32, which helps to stir and aerate the liquid 3.

These static partitions 32 have the advantage that they are static in promoting the mixing and aeration of the liquid in the vertical shell 11 and prevent trapping of strands within the vertical shell 11.

As a result, the liquid 3 is mixed and the bubbles are divided into microbubbles promoting the gas dispersion and consequently promote the aeration of the liquid 3.

Between the inner wall of the tank 1 and the vertical shell 11, the bubbles accelerate the lifting of the liquid and promote the circulation of the liquid in the tank 1, thereby increasing efficiency.

The liquid to be treated passes through the vertical casing 11 several times and thus overcomes several aerations.

The flow of liquid 3 can be regulated by moving the first housing 22 and the second housing 23 relative to the first channel 17 and the second channel 18.

The mixing of the liquid 3 with the main propeller 20 and the static partitions 32 causes foaming at the level of the liquid 3 in the tank 1.

Rotation of the main propeller 20 within the vertical shell 11 causes a pumping effect on the liquid level 3 in the upside-down funnel 14, suction of the foam floating on the liquid level 11 and its sinking in the vertical shell 11.

The foam is then contracted, immersed and mixed with the liquid 3 in the tank 1 to allow its gradual disposal.

The position of the first housing 22 relative to the first duct 17 and the second housing 23 relative to the second duct 18 regulates the flow of liquid and foam sucked inside the vertical housing 11 through the main propeller 20.

The selection of the main propeller 20 and its speed allows the energy consumption to be adapted to the fluid to be treated.

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In the case where the device according to the invention does not comprise static elements, as shown in FIG. 1, turbulence is naturally formed inside the vertical shell 1t. However, the efficiency is low, which is only suitable for slightly contaminated liquids.

Static baffles 32 promote mixing by cavitation, thereby improving the efficiency of the device.

Or, the static mixing device forms, with cavitation effect, static partitions mounted on the inner wall of the vertical shell 11 and defines an axial flow for the liquid circulation 3.

These static partitions are evenly spaced from one another over the portion of the vertical shell 11 below the first anti-vortex device 24 or within the vertical shell 11, both below the anti-vortex device 24 and on the lower part of the vertical housing 11

In this case also the static partitions are formed, for example, by suppositories whose concavity points towards the bottom of the tank 1 or the disc.

In the third embodiment shown in FIG. 5, the device consists of a second anti-viral device 40 located within the vertical shell 11 and above the main propeller 20.

This second anti-swirl device 40 comprises at least two second vertical plates 40a which extend upwardly into a reinforcing rib 41 extending as far as the upper end of the vertical casing 11.

Preferably, the second anti-swirl device 40 comprises four second vertical plates 40a evenly distributed within the vertical shell 11, each of which is terminated by a reinforcing rib 41.

According to another embodiment shown in FIG. 6, the device within the vertical shell 11 comprises a fluid accelerator.

This fluid accelerator has a secondary propeller 45 located above the second anti-vortex device 40 and mounted to rotate together with the vertical shaft 19.

The secondary propeller 45 or screw has a pitch oriented in the same sense as the main propeller 20 or screw.

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The liquid accelerator further has a third upside down device 46 above the secondary propeller 45 and within the cylinder shaft 47.

The cylindrical shaft 47 is mounted on the inner edge of the reinforcing ribs 41, so that it defines fluid passages 48 with the vertical skirt 11 and between the reinforcing ribs 41.

The secondary propellers 45 and the third anti-vortex device 46 and the cylindrical shaft 47 are located between two channel groups, a group of first channels 17 and a group of second channels 18, which in this embodiment regulate the fluid flow 3 and the flow of sucked foam inside the vertical housing 11

Rotation of the main propeller 20 causes the liquid 3 to be sucked into the vertical housing 11 by a group of first channels 17 and a group of second channels 18, so that the liquid 3 continuously circulates in the vertical housing 11 downwards.

Further, due to the rotation of the secondary propeller 45, the suction of liquid 3 within the vertical shell 11 is accelerated by a group of first channels 17 and a group of second channels 18 and a portion of the fluid rises through the passage 48 between 11th

In this case, again, control of the level of liquid 3 in the vertical shell 11 is achieved by positioning the first housing 22 relative to the group of first channels 17 and the second housing 23 relative to the group of second channels 18.

The third anti-vortex device 46 prevents rotation of the liquid in the cylinder shaft 47.

This embodiment is particularly well suited for products which have a particular tendency to foaming.

In fact, the foam floating on the surface of the liquid 3 is sucked into the interior of the cylinder shaft 47 due to the accelerated suction of the liquid 3 inside the cylinder shaft 47 and part of the liquid is recirculated through the passages 48.

In another embodiment shown in FIG. 7, the device has means for aerating the surface of the liquid 3 inside the tank 1.

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As shown in FIG. 7, the means for aerating the liquid surface 3 form additional secondary propellers 50 or a screw located above the second anti-vortex device 40 and are rigidly connected to the vertical shaft 19.

Another secondary propeller 50 has a pitch opposite to that of the main propeller

20th

The means for aerating the surface of the liquid 3 also includes a fourth anti-vortex device 51, located above the next secondary propeller 50 and within the second cylinder shaft 52.

The second cylindrical shaft 52 is attached to the edges of the stiffening ribs 41, so that, together with the vertical casing 11 and these stiffening ribs 41, it defines the second fluid passages 55.

A further secondary propeller 50 and a fourth anti-vortex device 51 are disposed between two channel groups, a group of first channels 17 and a group of second channels 1, and the second cylindrical shaft 52 extends substantially centrally to the group of first channels 17 to the upper edge of the group of second channels 18.

The cover 53 is attached to the vertical shaft 19 above the upper edge of the second cylindrical shaft 52.

The vertical position of the cover 53 is adjustable to define the upper edge of the second cylinder shaft 52 and the adjustable first passage 54.

The rotation of the main propeller 20 draws liquid 3 through the first channels 17 and the second channels 18 so that it circulates upwardly in the vertical housing 11.

Thus, a portion of the liquid 3 is sucked into the vertical casing 11 through the second channels 18 and a second portion of the liquid is sucked through the first channels 17 and flows downwardly into the second passages 55 defined between the cylindrical second shaft 52 and the vertical casing 11.

Further, since the pitch of the second secondary propeller 50 is opposite to that of the main propeller 20, a portion of the liquid is sucked up into the second cylinder shaft 52 and sprayed into the air at the liquid level 3 inside the upside-down funnel 14 as it flows through the first passage 54 .

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Spraying a portion of the liquid allows the level of the liquid 3 to be aerated, resulting in limited foam formation on the surface.

The fourth anti-vortex device 51 prevents rotation of the fluid in the second cylinder shaft 52 over the next secondary propeller 50.

Also in this embodiment, the flow of liquid 3 in the vertical shell 11 can be controlled by moving the first bushes 22 relative to the group of first channels 17 and the second bushings 23 relative to the group of second channels 18.

In the embodiment shown in FIG. 8 to 10, the device consists of a vortex pump 60 by which liquid is sucked from the surface into the vertical casing 11.

The vortex pump 60 is located above the second anti-vortex device 40 and at the level of the group of first channels 17. The vortex pump 60 is driven by a vertical shaft 19 and has a first annular plate 61 attached to the vertical shaft 19 and provided with vertical blades 62 at its upper end. a shaft 63 secured to the upper edges of the vertical blades 62.

The assembly comprising the annular plate 61, the vertical blades 62 and the shaft 63 is mounted on the vertical shaft 19 by a third bushing 61a whose position on the vertical shaft 19 is adjustable.

The third bushing 61a is fixed to the vertical shaft 19 by, for example, a stiffening screw (not shown).

As shown in FIG. 8 and 9, the upper edge of the vertical blades 62 is provided with a ring 64 protruding out of the shaft 63.

The shaft 63 extends from a position adjacent to the top of the tank 1, substantially from the central portion of the group of first channels 17 to the upper edge of the vertical blades 62.

The shaft 63 defines an internal flow 65 which communicates at its lower part with the interior of the vertical shell 11 by an annular flow 66 formed between the vertical blades 62 and between the ring 64 and the circular plate 61.

The shaft 63 is preferably conical and tapering towards the top of the tank 1, as shown in FIG. 9. In another variation, the shaft 63 may be cylindrical.

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The vertical vanes 62 are straight or curved and are preferably three evenly distributed over the circumference of the circular plate 61, as shown in FIG. 10th

Rotation of the main propeller 20 causes the liquid 3 to be sucked into the vertical housing 11 through the first channels 17 and the second channels 18, so that the liquid 3 in this vertical housing continuously flows downwards.

By rotating the vortex pump 60 driven by the vertical shaft 19, i. by rotating the assembly, including an annular plate 61, of liquid 3 into the internal flow 65 so that the liquid then flows through the annular flows 66 and is injected into the tank

First

In this embodiment, it is not necessary to control the flow of liquid through the first housing 22 and the second housing 23 within the vertical housing 11.

This embodiment is particularly well suited for a product with a high tendency to foaming, due to the fact that the foam floating on the surface of the liquid 3 is sucked in by the swirl pump 60 so that the foam can be quickly and effectively eliminated.

In the embodiment of FIG. 11 and 12, the device has a single pass propeller 70, which is positioned above the second anti-vortex device 40 and at the level of the group of first channels 17.

The single-pass propeller 70, driven by the vertical shaft 19, has a second annular plate 71 attached to the vertical shaft 19 and located above the liquid level 3 in the tank 1 and one in the liquid 3 has a third vertical spiral forming plate 72 attached to the lower face plates 71 around the vertical shaft 19.

As shown more clearly in FIG. 12, the third vertical plate 72 defines a lateral liquid inlet 73 extending over the entire height of the third vertical plate 72 and a vertical flow 74 for downward fluid flow and a lower liquid outlet 75.

The assembly consisting of the second annular plate 71 and the third vertical plate 72 is held on the vertical shaft 19 by the fourth housing 71a, the position of which on the vertical shaft 19 is adjustable.

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For this purpose, the fourth bushing 71a is fixed to the vertical shaft 19 by, for example, a bolt (not shown).

The inner edge of the third vertical plate 72 includes a vertical deflector 76 bent toward the center of the spiral formed by the third vertical plate 72.

The distance between the third vertical plate 72 and the vertical shaft 19 decreases progressively, as shown in FIG. 12 obvious.

Rotation of the single-pass propeller driven by the vertical shaft 19, i.e. the rotation of the assembly comprising the second circular plate 71 and the third vertical plate 72 as indicated by the arrow in FIG. 12, causes liquid to be sucked into the interior behind the third vertical plates 72 through the side inlet 73.

This liquid mixes inside the vertical flow 74, flows downstream and is blown into the vertical housing through the bottom outlet 75.

The deflector 76 assists in mixing the fluid in the vertical flow 74 and prevents it from returning through the side inlets 73.

In the last embodiment shown in FIG. 14, the device consists of a two-pass propeller 80 for sucking liquid 3 into the vertical housing 11.

This two-pass propeller 80 is located above the second anti-vortex device 40 and at the level of the group of first channels 17.

The two-pass propeller 80, which is rotated by the vertical shaft 19, consists, on the one hand, of a second annular plate 81 attached to the vertical shaft 19 and is located above the liquid level 3 in the tank 1. vertical plate 83.

The fourth vertical plate 82 and the fifth vertical plate 83 both have the shape of half-pans that are opposed and offset from each other, as shown in FIG. 14th

Both of these vertical plates define two side inlets, a first side inlet 84 and a second side inlet 85 and two downward fluid passages, a third passage 86 and a fourth passage 87, and a lower liquid outlet 88.

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The assembly formed by the second circular plate 81 and the fourth vertical plate 82 and the fifth vertical plate 83 is held on the vertical shaft 19 by the fifth bush 81a, the position of which on the vertical shaft 19 is adjustable. For this purpose, the fifth bushing 81a is fixed to the vertical shaft 19 by, for example, a bolt (not shown).

As best seen in FIG. 14, each edge of the fourth vertical plate 82 and the fifth vertical plate 83 facing downwardly to the third passage 86 and the fourth passage 87 is delimited by both boards provided with vertical deflectors, a first vertical deflector 89 and a second vertical deflector 90.

Rotation of the two-pass propeller 80 driven by the vertical shaft 19, i.e. the rotation of the assembly comprising the second circular plate 81 and the two vertical plates, the fourth vertical plate 82 and the fifth vertical plate 83, as indicated by the arrow in FIG. 14, causes suction of the liquid 3 through the first channels 17.

This liquid enters through the first side inlet 84 and the second side inlet 85, mixes inside the third passage 86 and the fourth passage 87, flows downwardly therefrom and is blown into the vertical housing through the lower outlet 88.

The first vertical deflector 89 and the second vertical deflector 90 assist in mixing the liquid in the third passage 86 and the fourth passage 87 and prevent it from being returned by the first side inlet 84 and the second side inlet 85.

In the latter two embodiments, control by the first housing 22 and the second housing 23 of the vertical casing 11 is not necessary, and the latter two embodiments are used earlier in cases where the liquid level in the tank 1 fluctuates.

To improve fluid flow through the single pass propeller 70 or the two pass propeller 80, the pump propeller (not shown) may be located on the vertical shaft 19 below the single pass propeller 70 or under the double pass propeller 80.

Industrial usability

The device according to the invention can be used, for example, for the treatment of water, municipal sewage, industrial waste water,

239 / B degradation, sewage products from teletechnics waste and generally any biodegradable industrial products.

The device according to the invention can also be used, for example, for ozonizing water with an ozonizing gas, optionally in the presence of a catalyst, for stabilizing sludge or for thermophilic treatment of liquids containing, for example, organic or mineral substances in suspension.

The device according to the invention can also be used as a fluidized or moving bed reactor.

The device according to the invention has the advantage of treating the liquid and at the same time progressively eliminating the foam floating on the surface of the liquid in the treatment tank, thereby ensuring that the foam will not pollute the environment.

Claims (33)

PATENT CLAIMS Apparatus for mixing and aerating a liquid and for removing foam in a liquid processing tank, wherein inside the tank (1) is: - a vertical casing (11) extending into a part of the height of the tank (1) and having at the top at least a first channel (17) and a second channel (18) providing a liquid inlet (3) and near the bottom of the tank at least a second opening providing a drain (13) liquid (3), - an upwardly directed funnel (14) around the upper part of the vertical shell (11) and connected to the vertical shell (11), the upper edge of the upwardly facing funnel (14) defining a free space (15) for the fluid flow (3) ) - a main propeller (20), located within the vertical shell (11) near the bottom of the upward-facing funnel (14), - a propelling rotating vertical shaft (19) extending inside the vertical housing (11) above the main propeller (20) which is driven by the vertical shaft, - a first anti-vortex device (24) inside the vertical shell (11) below the main propeller (20), - injection means (33) of gas injected under pressure into the region of the vertical housing (11) under the first anti-vortex device (24), characterized in that, under the first anti-vortex device (24) there is a static mixing device inside the vertical housing (11) a vertical pipe (31) and a static septum (32) for mixing the liquid (3) by turbulence. Device according to claim 1, characterized in that it has - a plurality of first ducts (17) at the top of the vertical shell (11) and located at the liquid level (3) in the upside-down funnel (14), - a plurality of second channels (18) within the vertical housing (11) above the bottom of the upside-down funnel (14), and - an overflow pipe (25) for regulating the level of the liquid (3) in the upward-facing funnel (14). 31,239 / B Apparatus according to claim 2, characterized in that it has a first housing (22) and a second housing (23) for controlling the flow of liquid (3) and foam, sucked by the main propeller (20) into the vertical housing (11). Apparatus according to claim 3, characterized in that the sleeves for controlling the flow of the liquid (3) and the foam drawn by the main propeller (20) into the vertical housing (11) are positioned such that the first housing (22) encloses the vertical housing (11). at the level of the plurality of first channels (17) and the second housing (23) encircling the vertical housing (11) at the level of the plurality of second channels (18), the position of the sleeves, first housing (22) and second housing (23) relative to the channels, first channel ( 17) and the second channel (18) is adjustable in the vertical direction. Apparatus according to one of Claims 1 to 4, characterized in that the means for static mixing by turbulence comprise, on the one hand, a vertical pipe (31) disposed within the vertical casing (11) extending from the bottom of the tank (1) to below the first anti-vortex device (24). ), on the other hand, opposing static partitions (32) located inside the vertical casing (11) and fixed to the vertical tube (31). Device according to claim 5, characterized in that the static partitions (32) define the fluid flow passages (3) inside the vertical housing (11). Apparatus according to claims 5 and 6, characterized in that the static partitions (32) are evenly distributed in the part of the vertical tube (31) located inside the vertical casing (11). Device according to claims 5 and 6, characterized in that the static partitions (32) are arranged on the vertical tube (31) below the first anti-swirl device (24) and on the lower part of the vertical casing (11). 31,239 / B Apparatus according to claim 5, characterized in that the static mixing means using turbulence comprise static partitions (32) mounted on the inner wall of the vertical casing (11) and defining a vertical passageway for the fluid flow (3). Apparatus according to claim 9, characterized in that the static partitions (32) are evenly distributed over a portion of the vertical housing (11) located below the first anti-vortex device (24). Device according to claim 10, characterized in that the static partitions are arranged inside the vertical housing (11), on the one hand under the first anti-viral device (24), and on the other hand in the lower part of the vertical housing (11). Device according to claims 5 to 11, characterized in that the static partitions (32) form suppositories pointing with their concave side towards the bottom of the tank (1). Apparatus according to claims 5 to 11, characterized in that the static partitions (32) form discs. Apparatus according to claims 1 to 13, characterized in that the tank (1) is insulated. Device according to one of Claims 1 to 14, characterized in that the means for controlling the level of the liquid (3) in the upturned funnel (14) form an overflow tube (25) inside the upturned funnel (14) in a position adjustable vertically. Apparatus according to claims 1 to 15, characterized in that it has a second anti-viral device (40) inside the vertical housing (11) and above the main propeller (20), the second anti-viral device (40) comprising at least two second vertical plates (40). 40a), each of which extends upwardly by the ribs (41) to the upper end of the vertical casing (11). 31,239 / B Apparatus according to claims 1 to 16, characterized in that it has a fluid accelerator inside the vertical casing (11). Apparatus according to one of Claims 1 to 17, characterized in that the fluid accelerator comprises a secondary propeller (45) located above the second anti-viral device (40), connected rotatably to the vertical shaft (19) and having a pitch of the same meaning as the main pitch. a propeller (20), on the one hand a third anti-swirl device (46) located above the secondary propeller (45) and inside a cylindrical shaft (47) attached to the reinforcing ribs (41), the secondary propeller (45), third anti-swirl device (46) and cylindrical shaft (47) are located between the group of the first channel (17) and the group of the second channel (18). Apparatus according to claims 1 to 16, characterized in that it has means for aerating the liquid level in the tank (1). Apparatus according to claims 1 to 16 and 19, characterized in that the means for aerating the liquid level are, on the one hand, another secondary propeller (50) located above the second anti-vortex device (40) rotatably coupled to the vertical shaft (19) and having a pitch of opposite. meaning a pitch of the main propeller (20), and a fourth anti-vortex device (51) located above another secondary propeller (50) and inside a second cylindrical shaft (52) attached to the stiffening ribs (41), the other secondary propeller (50). ) and a fourth anti-viral device (51) is disposed between the first channel group (17) and the second channel group (18) and the second cylindrical shaft (52) and located substantially from the central portion of the first channel group (17) to the upper edge of the second channel group channel (18). Device according to claim 20, characterized in that a cover (53) is attached to the vertical shaft (19) above the upper edge of the second cylindrical shaft (52) and defines an adjustable first passage (54) with the upper edge. 31,239 / B Apparatus according to claims 1 to 3 and 5 to 16, characterized in that it comprises a vortex pump (60) for sucking the liquid level into the vertical housing (11) located above the second anti-vortex device (40) and at the level of the group of first channels (17). ). Apparatus according to claim 22, characterized in that the vortex pump (60) is formed by a first annular plate (61) connected rotatably to a vertical shaft (19) and provided with radial and vertical blades (62) on the upper side and a shaft (63). ) attached to the upper edge of the vertical vanes (62) and extending from a position adjacent to the upper end of the tank (1) substantially from the central portion of the group of first channels (17) to the upper edge of the vertical vanes (62). Device according to claim 23, characterized in that the shaft (63) is conical and tapers towards the top of the tank (1). Apparatus according to claim 23, characterized in that the shaft (63) is cylindrical. Device according to claim 23, characterized in that the vertical vanes (62) are straight or curved. Apparatus according to claims 1 to 3 and 5 to 16, characterized in that it comprises a single pass propeller (70) for sucking liquid (3) into the vertical housing (11), located above the second anti-viral device (40) and at the first channel group level (17). Apparatus according to claim 27, characterized in that the single-pass propeller (70) is formed by a second circular plate (71) connected rotatably to the vertical shaft (19) and positioned above the liquid level (3) in the tank (1) and partly in liquid. (3) a third vertical plate (72) forming a spiral and secured to the lower face of the second circular plate (71) around the vertical shaft (19), the third vertical plate (72) defining a side fluid inlet (73), vertical flow (74) for downward fluid flow and bottom drain (75). 31,239 / B Apparatus according to claim 28, characterized in that the inner edge of the third vertical plate (72) has a vertical deflector (76) that is bent toward the center of the spiral. Apparatus according to claims 1 to 3 and 5 to 16, characterized in that it comprises a two-pass propeller (80) for sucking liquid (3) into the vertical housing (11) located above the second anti-viral device (40) and at the first channel group level (17). Device according to claim 30, characterized in that the two-pass propeller (80) is formed by a second circular plate (81) rotatably connected to the vertical shaft (19) and positioned above the liquid level (3) in the tank (1) and (3) two vertical plates, a fourth vertical plate (82). and a fifth vertical plate (83) fixed to the lower face of the second circular plate (81) and having the shape of half-pans which are opposed and offset, the circular plates, the fourth circular plate (82) and the fifth circular plate (83) define two side inlets, a first side inlet (84) and a second side inlet (85) for liquid and two vertical inlet passages, a vertical inlet third passage (86) and a vertical inlet fourth passage (87) for downward fluid flow and a lower outlet ( 88) for liquid. The apparatus of claim 31, wherein the edge of each plate, the fourth vertical plate (82) and the fifth vertical plate (83), facing the vertical inlet third passage (86) and the vertical inlet fourth passage (87) defined by each plate including a first vertical deflector (89) and a second vertical deflector (90). Apparatus according to claim 27 or 30, characterized in that the pump propeller is mounted on the vertical shaft (19) below the single-pass propeller (70) or under the double-pass propeller (80).