SK285345B6 - 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 treat-ing 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), be-neath said helix (20), means (25) for regulating the level of liquid in the funnel (14) and means (33) for in-jecting pressurised gas in to the casing (11).

Description

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 inside injector manifold at the bottom to inject air under pressure into the aeration fluid 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.

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, these agents have been microbeads, placed on the surface of the liquid 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 consumption. liquid.

SUMMARY OF THE INVENTION

Apparatus for mixing and aerating a liquid and for removing foam in a tank during liquid processing, 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 casing and connected to the vertical casing, the upper edge of the upside-down funnel defining a free space for the flow of liquid with the tank wall,

- a main propeller located 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,

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

injecting the gas injected under pressure into the vertical housing area under the anti-virus device, according to the invention, that the first anti-virus device is inside the vertical housing 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 apparatus comprises means for regulating the flow of liquid and for sucking the foam through the propeller inside the vertical shell,

- the device comprises means for influencing static mixing by the cavitation of the liquid inside the vertical shell and arranged below the antiviral means inside 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 group of the first channels and a second housing positioned around the vertical housing at the group of the second channels, the position of these housings relative to the respective channels being adjustable vertically .

- 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-virus means, and by vertical partitions located inside the vertical shell and fixed to the pipe,

- the apparatus comprises second anti-virus means located inside the vertical housing and above the main propeller, the second anti-virus 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 comprises a fluid accelerator inside the vertical housing,

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

- the device 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 housing, located above the second antiviral means and at the level of the group of first channels,

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

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

BRIEF DESCRIPTION OF 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.

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 section 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 cross-sectional view taken along line 14-14 of FIG. 13th

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 and 3, there is shown a tank 1 or a keg, 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 at the bottom of the tank 1 a liquid outlet 13.

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.

The assembly, comprising the vertical casing 11 and the upwardly facing funnel 14, is fixed inside the tank 1 by suitable means, for example by struts 16, which define the fluid flows 3 therebetween.

In the vertical shell 11, a plurality of first channels 17 are evenly distributed around the circumference of the vertical shell 11a located at the level of the liquid inside 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 11a located at the bottom of the upside-down funnel.

14th

The diameter of the main propeller 20 is slightly smaller than the inner diameter of the vertical shell 11.

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 sucked 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 against the group of first channels 17 and the second housing 23 against the group of second channels 18 is adjustable in the vertical direction by suitable (not shown) terminals.

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

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

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 liquid 3 within the vertical housing 11, located below the first anti-virus device 24 in the vertical housing 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 housing 11 extending from the bottom of the tank 1 to below the first anti-virus device 24 and secondly arranged one another. mounted on a vertical pipe 31.

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

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

As shown in FIG. 3, the static compartments 32 are arranged around the vertical tube 31, on the one hand, under the first anti-virus device 24, and on the bottom of the vertical housing 11, on the other.

For example, the vertical tube 31 carries two static compartments 32 on top of the first anti-virus device 24, and two static compartments 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 portion of which points 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.

The injection means 33 comprises 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 device described works as follows:

The liquid 3 to be treated is poured through the inlet 2 into the tank 1 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 drawn 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 the liquid outlet 13 and circulates from bottom to top between the vertical shell 11a and the inner wall of the tank 1, and this is repeated.

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

The level of liquid 3 in the upside-down funnel 14 is below the level of liquid in the tank 1, and this level of 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 17.

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 creates gas bubbles which disperse in the liquid 3 inside the vertical cylinder 11 by rotation of the main propeller 20.

During the circulation of the liquid 3 in the vertical shell 11, a cavitation phenomenon occurs under each static partition 32, which assists in mixing and aerating the liquid 3.

These static compartments 32 have the advantage that they are static in promoting the mixing and aeration of the liquid in the vertical shell 11 and prevent the 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 this 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 controlled by moving the first housing 22 and the second housing 23 against 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 inside 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, opposite the first duct 17 and the second housing 23 opposite 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.

In the case where the device according to the invention does not comprise static elements, as shown in FIG. 1, turbulence occurs naturally within the vertical shell 11. However, the efficiency is low, which is only suitable for slightly contaminated liquids.

Static compartments 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 11a defining an axial flow for the liquid circulation 3.

These static compartments are spaced evenly over a portion of the vertical shell 11 below the first anti-virus device 24 or within the vertical shell 11 both below the anti-virus device 24 and on the lower side of the vertical shell 11.

In this case, too, the static partitions are formed, for example, by suppositories whose convexity 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-virus device 40 located within the vertical housing 11a above the main propeller 20.

This second anti-virus 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 housing 11.

Preferably, the second anti-virus 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 inside the vertical shell 11 comprises a fluid accelerator.

This fluid accelerator has a secondary propeller 45 located above the second anti-virus 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.

The liquid accelerator further has a third anti-virus 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 stiffening ribs 41, so that it defines fluid passages 48 with the vertical skirt 11 and between the stiffening ribs 41.

The secondary propellers 45 and the third anti-virus device 46 and the cylinder shaft 47 are disposed between two channel groups, a group of first channels 17 and a group of second channels 18, which in this embodiment regulate the flow of liquid 3 and the flow of sucked foam inside the vertical housing.

11th

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 liquid rises through the passage 48 between the vertical shell 11 and the cylinder shaft 47, further emphasizing this phenomenon .

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

The third anti-virus device 46 prevents the 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 inside the cylinder shaft 47 due to the accelerated suction of the liquid 3 inside the cylinder shaft 47 and a portion of this 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.

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

Another secondary propeller 50 has a pitch opposite to that of the main propeller 20.

The means for aerating the surface of the liquid 3 also includes a fourth anti-viral device 51, located above the next secondary propeller 50 and inside 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 11a, these stiffening ribs 41 define the second fluid passages 55.

A further secondary propeller 50 and a fourth anti-virus 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 upturned funnel 14 as it flows through the first passage 54.

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-virus device 51 prevents rotation of the liquid 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 bushings 22 against the group of first channels 17 and the second bushings 23 against 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-virus 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 equipped with vertical blades 62 at its upper end. a shaft 63 secured to the upper edges of the vertical blades 62.

The assembly comprising an annular plate 61, vertical blades 62 and 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 secured 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 tapers towards the top of the tank 1, as shown in FIG. 9. In another variation, the shaft 63 may be cylindrical.

The vertical vanes 62 are straight or curved and are preferably three equally spaced around the periphery 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. j. by rotating the assembly including the annular plate 61, the liquid 3 into the internal flow 65 so that the liquid then flows through the annular flows 66 and is injected into the tank 1.

In this embodiment, it is not necessary to control the flow of fluid 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 that is positioned above the second anti-virus 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 positioned 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 that extends over the entire height of the third vertical plate 72 and a vertical downward fluid flow 74 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.

For this purpose, the fourth bushing 71a is fixed to the vertical shaft 19, for example by a screw (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 the liquid to be sucked in 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 comprises 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-virus 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.

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, fats by biodegradation, sewage substances from leletechnechn 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 removing foam in a liquid treatment tank, wherein inside the tank (1) is a vertical shell (11) extending into a portion of the height of the tank (1) and having at least a first channel (17) in the upper part; a second channel (18) providing an inlet of liquid (3) and at least a second opening providing the liquid outlet (13) near the bottom of the tank, - an upwardly directed funnel (14) around the upper part of the vertical housing (11) and connected to the vertical housing ( 11), the upper edge of the upwardly facing funnel (14) defining a free space (15) for the liquid flow (3) with the wall of the tank (1), - a main propeller (20) located inside the vertical shell (11) near the bottom of the upside-down funnel (14), a driving rotating vertical shaft (19) passing inside the vertical housing (11) above the main propeller (20), which is driven by the vertical shaft, the first anti-virus device (24) inside the vertical housing (11) after d by means of a main propeller (20), injection means (33) of gas injected under pressure into the region of the vertical housing (11) under the first anti-virus device (24), characterized in that under the first anti-virus device (24) is inside the vertical housing (11) 11) a static mixing device consisting of a vertical tube (31) and a static partition (32) for mixing the liquid (3) by turbulence. Device according to claim 1, characterized in that it has a plurality of first channels (17) in the upper part of the vertical casing (11) and located at the liquid level (3) in the upturned funnel (14), a plurality of second channels (18). ) inside the vertical casing (11) above the bottom of the upside-down funnel (14) and the overflow pipe (25) for controlling the level of the liquid (3) in the upside-down funnel (14). Device according to claim 2, characterized in that it has a first housing (22) and a second housing (23) for controlling the flow of the liquid (3) and the 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 sucked by the main propeller (20) into the vertical housing (11) are arranged such that the first housing (22) encloses the vertical housing (3). 11) at the level of the group of first channels (17) and the second housing (23) encircling the vertical shell (11) at the level of the group of second channels (18), the position of the housings, the first housing (22) and the second housing (23) The channel (17) and the second channel (18) are adjustable in the vertical direction. Device according to one of Claims 1 to 4, characterized in that the means for static turbulence mixing comprise, on the one hand, a vertical pipe (31) located inside the vertical jacket (11) extending from the bottom of the tank (1) to the first anti-viral device (24). on the one hand, opposing static partitions (32) located inside the vertical casing (11) and fixed to the vertical pipe (31). A 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 claim 5 and 6, characterized in that the static partitions (32) are arranged on the vertical tube (31) below the first anti-virus device (24) and on the lower part of the vertical housing (H). 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). Device according to claim 9, characterized in that the static partitions (32) are evenly distributed in the part of the vertical casing (11) located below the first anti-virus 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-virus device (24), and on the other hand in the lower part of the vertical housing (11). Apparatus according to claims 5 to 11, characterized in that the static partitions (32) form pins with their concave sides 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 pipe (25) inside the upturned funnel (14) in a position adjustable vertically direction. Apparatus according to claims 1 to 15, characterized in that it has a second anti-virus device (40) inside the vertical housing (11) and above the main propeller (20), wherein the second anti-virus device (40) comprises at least two second vertical plates (40a), each extending upwardly by stiffening ribs (41) up to the upper end of the vertical skirt (11). Device according to claims 1 to 16, characterized in that it has a fluid accelerator inside the vertical housing (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 pitch a main propeller (20), a third anti-virus device (46) located above the secondary propeller (45) and inside a cylindrical shaft (47) attached to the stiffening ribs (41), the secondary propeller (45), third anti-virus device (46) and cylindrical the shaft (47) is 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-viral device (40) rotatably connected to the vertical shaft (19) and having a rise in the opposite direction to that of the main propeller (20) and a fourth anti-viral 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 antivirus device (51) are 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 the second channel group (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 this upper edge. Apparatus according to claims 1 to 3 and 5 to 16, characterized in that it comprises a vortex pump (60) for sucking up the liquid level into the vertical housing (11) located above the second anti-viral 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) comprises, on the one hand, a first annular plate (61) connected rotatably to the vertical shaft (19) and equipped with radial and vertical blades (62) on the top and a shaft (63) attached to the upper edge of the vertical vanes (62) and extending from a position adjacent 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). Device according to Claim 23, characterized in that the shaft (63) is cylindrical. Device according to claim 23, characterized in that the vertical blades (62) are straight or curved. Apparatus according to claims 1 to 3 and 5 to 6, characterized in that it comprises a single pass propeller (70) for sucking liquid (3) into the vertical housing (11), located above the second anti-virus device (40) and at the group of the first channel (17). Apparatus according to claim 27, characterized in that the single-pass propeller (70) is formed by a second circular plate (71) rotatably connected to the vertical shaft (19) and positioned above the liquid level (3) in the tank (1) and a fluid (3) a third spiral forming vertical plate (72) and secured to the lower face of the second annular plate (71) around the vertical shaft (19), the third vertical plate (72) defining a side fluid inlet (73), a vertical flow (74) ) for the flow of liquid downwards and the lower outlet (75). Device 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 6, characterized in that it comprises a two-pass propeller (80) for sucking liquid (3) into the vertical housing (11), located above the second anti-virus device (40) and at the group of the first channel (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 located above the liquid level (3) in the tank (1) and on the one hand, in the liquid (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 have the shape of half-pans facing each other 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 liquid inlet (85) and two vertical inlet passages, a vertical inlet third passage (86); a vertical downstream fourth fluid passage (87) and a lower fluid outlet (88). 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, includes a first vertical deflector (89) and a second vertical deflector (90). The device according to claim 27 or 30, characterized in that the pump propeller is mounted on a vertical shaft (19) below the single-pass propeller (70) or under the double-pass propeller (80).