MXPA99006406A - 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

DEVICE FOR AGITATION AND FOR AERATION OF A LIQUID AND ELIMINATION OF THE FOAM IN A CUBA OF TREATMENT OF THIS LIQUID DESCRIPTION OF THE INVENTION The present invention has as its object a device for agitation and for aeration of a liquid and for elimination of the foam in a treatment tank for said liquid, such as, for example, extracted fatty waste from urban wastewater effluents. or of the agro-food industries. As is well known, urban sewage effluents that circulate in drainage canals, such as sewers, are collected in treatment plants in which various treatment operations are carried out in order to purify them before returning them to the natural environment. This operation "produces byproducts related to the purification, such as grease, mud ... On the other hand, the discharges of this type of products are less and less accepted, so that the current purification plants must be able" to treat them to limit them to the maximum.

In this way, the greases trapped at the entrance to the treatment plant are dumped in a treatment tank, such as a biological degradation tank, which includes a mechanical agitator that allows the liquid to stir. In addition, the tank can be arranged in its interior and in its lower part of air injection ramps under pressure in the liquid, which allow to ventilate and accentuate the liquid agitation. However, this type of device for aeration and agitation is suitable, more precisely for low-loaded fluids, that is to say low viscosity, and their performance decreases rapidly for fluid loaded especially with grease. In addition, when treating liquids such as greasy wastes, with this type of device, an important layer of foam is formed on the surface of the liquid that flies and contaminates the environment, to such an extent that it is necessary to foresee means that can not be avoided. they allow to eliminate this frothing foam on the surface of the liquid when it is treated, Until now, these means are supported by agitators arranged at the level of the surface of the liquid and are intended to lower the foam. But, these agitators do not provide complete satisfaction and a part of the foam is blown and pollutes the environment. The object of the invention is to avoid these drawbacks by proposing a device for stirring and for aerating a liquid, such as p > Examples of greasy wastes extracted from urban sewage effluents or from agricultural industries are substances that allow, through simple and low-energy means, to effectively treat this type of liquid and recover floating foam on the surface. of the same. The object of the invention is therefore to provide a device for agitating and aerating a liquid and removing the foam in a treatment tank for said liquid, characterized in that it comprises, inside the tank: - a vertical cylinder which it extends over a part of the height of the tank and that is closed at its upper end and open at its lower end, presenting between the lower end of said cylinder and the bottom of the tank, a passage for the liquid, - a funnel arranged around the upper part of the cylinder and attached to said cylinder, the upper edge of that funnel and the wall of the tank, present a free space for the passage of the liquid, - a first series of windows made in the upper part of the cylinder and located at the level of the liquid in the interior of the funnel, - a second series = of windows made in the cylinder and located above the bottom of the funnel, a tree to see how it worked in rot ation, arranged inside the cylinder and extending from the upper end of said cylinder to the bottom of the funnel, a fixed main propeller at the free end of the shaft, below the bottom of the funnel, - - an anti-vertex body disposed inside the cylinder, below said helix, - means for regulating the liquid level in the funnel, ~ and means for injecting a gas under pressure_ into the cylinder below the organ ant i vo rt ex. According to other features of the invention, the tank is isolated, the device comprises means for regulating the flow rate of liquid and foam sucked by the propeller inside the vertical cylinder, the device comprises static agitation means. by cavitation of the liquid inside the cylinder and that are disposed by the antiviral body in said cylinder, the means for regulating the flow rate of liquid and foam sucked by said propeller are formed, by one part, by a first handle arranged around the cylinder at the level of the first series of windows and, on the other hand, by a second handle disposed on the coiler of said cylinder at the level of the second series of windows, the position of said handles being vertically adjustable with sp ect to the corresponding windows, - the means of static agitation for cavitation are formed, on the one hand, by a vertical tube arranged in the inside of the cylinder and extending from the bottom of the tank to below the anti-vertex element, and on the other hand, by static obstacles superimposed, arranged inside said cylinder and fixed in said tube, the device comprises a second antivortex organ disposed in the -interior of the cylinder "and above the main propeller, that second antivortex organ being formed by at least two vertical plates and extended each one upwards by a reinforcement rib extending to the upper end of said cylinder, the "device comprises a liquid accelerator inside the cylinder, - the device ^ comprises means of aeration of the surface of the liquid inside the tank, the device comprises a vortex pump for suction of the liquid surface inside "of the cylinder, arranged above the second anti-vertex body and at the level of the first series of windows, - - the It comprises a single-channel propeller for suction of the liquid inside the cylinder, arranged above the second antiviral element and at the level of the first series of ventilations, the device comprises a two-channel propeller for suction of the liquid in the inside of the cylinder, disposed above the second antivortex organ and at the level of the first series of windows. Other features and advantages of the invention will appear in the course of the description that follows, based on the drawings that are appended, in which: Fig. 1 is a schematic view of a section of A liquid treatment vessel, equipped with a first embodiment of a device for agitation and for aeration of said liquid, conforms to the invention, FIG. 2 is a sectional view according to line 2-2 of FIG. 1, Fig. 3 is a schematic sectional view of a liquid treatment tank, equipped with a second embodiment of a device for agitation and for aeration of said liquid, according to the invention, Fig. 4 is a sectional view according to line 4-4 of FIG. 3, - FIG. 5 is a schematic partial sectional view of a third embodiment of a device "for agitation" and for liquid aeration, in accordance with the invention, Fig. 6 is a schematic view FIG. 7 is a schematic sectional view of the aeration means of the liquid surface, FIG. 8 is a schematic partial view and in section of a fourth embodiment of a device for agitation- and for aeration of the liquid, according to the invention, Fig. 9 is a schematic and enlarged view of the vortex pump of the fourth embodiment of the device, according to the invention, - Fig. 10 is a sectional view according to line 10-10 of Fig. 9. , Fig. 11 is a schematic partial view and in section, of a fiembodiment of a device for agitation and for aeration of the liquid, according to the invention, Fig. 12 is a sectional view according to line 12. -12 of Fig. 11, Fig. 13 is a schematic partial sectional view of a sixth embodiment of a device for agitation and for aeration of the liquid, according to the invention, Fig. 14 is a view in cut according to line 14-14 of Fig. 13. In Figs. 1 and 3, there is represented a vat 1 provided in its upper part with an inlet hole 2 for a liquid 3 to be treated, such as, for example, grainy effluents extracted from urban sewage effluents. The inner face of the treatment vessel 1 is covered by an insulator 4 and includes a device for agitation and for aeration of the liquid and for foam removal designated in its set by means of the reference 10. The device 10 according to invention disposed inside the tank 1 is composed of a vertical cylinder 11 which extends over a part of the height of said tank 1. The upper end 11 of the cylinder 11 is sealed by means of a plate 12 and the lower end of the cylinder 11. this cylinder 11 is open and offers with the tank bottom 1 a passage 13 for the liquid 3. The device 10 also includes a funnel 14 inclined upwards whose upper edge offers with the "wall of the tub 1 a free space 15 for the Passing the Liquid 3 and whose lower edge is joined to the cylinder 11 at some distance from the upper end of said cylinder 11. The assembly constituted by the cylinder 11 and the funnel 14 is fixed inside the 1 by appropriate means such as for example legs 16 which have between them openings for the passage of the liquid fluid 3. The cylinder includes a first series of windows 17 uniformly distributed in the outline of the cylinder 11 and which are located at the level of the liquid. liquid inside the funnel 14. This cylinder 11 is also provided with a series of windows 18 uniformly distributed on the contour of said cylinder 11 and located above the bottom of the funnel 14. The device 10 is also provided with means for sucking the foam and the foam inside the cylinder 11 by means of the windows 17 and 18 and which are constituted by a vertical shaft 19 arranged "inside this cylinder 11 which extends from the upper end. from said cylinder 11 to the bottom of the funnel 14, and by a main propeller 2 O fixed at the free end "of the shaft 19, due to the bottom of said funnel 4. The diameter of the main propeller pal 20 is slightly less than the inner diameter of the indium c 1. The shaft 19 and helix 20 are driven in rotation by means of a gear motor 21 which is fixed to the sealing plate 12 of the upper end of said cylinder 11. The device 10 is provided with means for regulating the flow rate of liquid and foam sucked by the main propeller 20 inside the cylinder 11 through the windows 17 and 18. These means of regulation are formed, on the one hand, by a first handle 22 arranged around the cylinder 11 at the level of the first series of windows 17 and by a second handle 23 differs about said cylinder at the level of the second series of windows 18. The position of each handle 22 and 23 with respect to to the windows 17 and 18 respectively, it is vertically adjustable by appropriate adjustment means, not shown. An antivortex member 24 has been arranged inside the cylinder 11 below the propeller 20, so as to prevent the rotation "" of the liquid 3 in said indigo cylinder 11. As shown in Fig. 2., this anti-vertex body 24 is constituted by three vertical plates 24 a, arranged at 120 ° inside said cylinder 11. The device 10 is also provided with means for regulating the level of liquid 3 in the funnel 14 which are constituted by a spill tube 25 arranged inside said funnel 14 and whose position can be regulated see 11 warmly. According to a second embodiment represented in FIG. 3, the device 10 comps means 30 for static agitation by cavitation of the liquid 3 inside the indium coil 11 and arranged below the anti-vortex member 24 in said cylinder 11. as shown in Figs. 3 and 4, the means 30 for static agitation by cavitation of the liquid 3 are formed, on the one hand, by a vertical tube 31 disposed inside the cylinder 11 and extending from the bottom of the tub 1 to the bottom of the antivortex organ 24 and, on the other hand, by static obstacles 32 superimposed, arranged inside said cylinder 11 and fixed in the tube 31. The tube 31 is fixed in the bottom of the tub 1 by appropriate means. The static obstacles 32 present steps with the inner wall of the cylinder 11, for the circulation of the liquid. As shown in FIG. 1, the static obstacles 32 are arranged in the tube 31, on the one hand, below the antivolt device 24 and, on the other hand, in the lower part of the cylinder 11. For example, the tube 31 includes, in its upper part, below the antiviral body 24, two static obstacles 32 superimposed, and in the lower part of the cylinder 11 two other static organs 32 overlapping. According to a variant, the static obstacles 32 can be distributed regularly over the entire part of the tube arranged in the cylinder 11. According to an embodiment shown in FIG. 3, the static obstacles 32 are formed by cups whose concavity is directed towards the bottom of the tub 1.

According to a variant, static obstacles 32 can be formed by_disks. Finally, the dialogue "10 includes media 33 - injection, of a gas under pressure in the cylinder 11, such as air. These injection means 33 are formed, by at least one conduit 34 that opens into the cylinder 11 for example at a level below the static organs 32 arranged in the upper part of the tube 31. The device that has just The liquid 3 which is to be treated is poured through the hole 2 in the tub 1 until it reaches a level above the upper edge of the funnel 14. That liquid 3 is also poured into the liquid. inside that funnel 14. The motor reducer 21 pulls in rotation the shaft _19 which in turn pulls in rotation the main propeller 20. Simultaneously, the gas under pressure is injected into the cylinder 11 by means of the conduits 34.

The rotation of the main propeller 20 causes a suction of the liquid 3 in the cylinder 11 through the windows 17 and 1"8 in such a way that the liquid 3 circulates continuously from top to bottom in this cylinder 11, then passes through the space 13 and circulates from bottom to top between the cylinder 11 and the internal stop of the tub 1 and so on. Antivortex organ 24 prevents the rotation of the liquid in cylinder 11 below helix 20. The level of liquid 3 inside funnel 14 is below the liquid level inside 1 to Cuba 1, and that The level of liquid inside the funnel 14 is regulated by means of the spill tube 25 in such a way that the latter is not sensibly at mid-height of the windows 17. On the other hand, due to the aspiration created. the propeller 20 inside the cylinder 11, the liquid level inside this cylinder 11 is below the level of liquid_ inside the funnel 14. The entrained air- inside the chimney 11 by the rotation of the the propeller 20, as well as the gas under pressure injected in said cylinder 11 create gas bubbles that are dispersed in the liquid 3 in the interior of said cylinder 11 by effect of the rotation of the "helix 20. - During the circulation of the liquid 3 in the interior r of cylinder 11, static obstacles 32 have a cavitation effect below each of these, which has the effect of favoring the agitation and aeration of the liquid 3. These obstacles 32 have the advantage of being static, favoring at the same time the agitation and aeration of the liquid. liquid in the cylinder 11, and preventing the coupling of filaments inside this cylinder 11. In this way, the liquid 3 is agitated and the bubbles of gas are divided into microbubbles that prevent the dispersion of the gas and by therefore the aeration of the liquid 3. Between the wall of the tank 1 and the cylinder 11 the bubbles of gas accelerate the rise of the liquid, favoring the circulation of this liquid in the interior of the tank 1, which makes it possible to improve the liquid. performance. In this way, the liquid to be treated passes through the cylinder 11 several times and is subjected to several oxygenation treatments.

The flow of liquid 3 can be regulated by moving the handles 22 and 23 with respect to the windows 17 and 18. ~ The agitation of the liquid 3 by means of the propeller. 20 and the static obstacles 32 causes the formation of foam on the surface of the liquid 3 in the tub 1. The rotation of this helix 20 inside the cylinder 11 causes a. pumping to the level of the liquid surface 3 inside the funnel 14 and an aspiration of the floating foam on the surface of the liquid as well as a drop in the level of that liquid inside the cylinder 11. The foam is therefore entrained sunken and mixed with the liquid 3 inside the tank 1 which allows to eliminate it progressively. The position of the handles 22 and 23 with respect to the windows 17 and 18 regulates the flow of liquid and foam sucked inside the cylinder 11 by the propeller 2 OJT The choice of the main propeller 20 and the speed of rotation of this helix 20 allow to adapt the energy consumption according to the liquid to be treated. "" In the case where. the device of the invention does not have static organs 32 as shown in Fig. L, turbulences are naturally created inside the cylinder 11. But, the efficiency is low which is convenient for low-loaded liquids. The static obstacles 32 favor the agitation of the liquid by cavitation which allows to increase the performance of the device. According to a variant, the means of static agitation by cavitation are formed by fixed static obstacles in the internal wall of the cylinder 11 and have an axial passage for the circulation of the liquid 3. These static obstacles are regularly distributed over the entire cylinder head. 11 which is below the anti-vertex element 24 or inside the cylinder 11, on the one hand, by the end of the anti-vertex body 24 and, on the other hand, on the lower part of said cylinder 11. also case, the static obstacles are formed for example by cups whose concavity is directed towards the bottom of the tank 1 or by disks.

According to a third embodiment represented in FIG. 5, the device comprises a second anti-vertex member 40 arranged in the interior of the cylinder 11 and above the main helix 20. "This second anti-vertex member 40 is formed by at least two plates 40 a, vertical and extended each one upwards by a reinforcing rib 41 extending to the upper end of said cylinder 11. Preferably, the second antiviral member 40 is formed by four vertical plates 40 a, uniformly distributed in the inside of the cylinder 11 and extended each one upwards by a reinforcing fluid 41. According to another embodiment shown in FIG. 6, the device comprises a liquid accelerator inside the cylinder 11. This liquid accelerator is formed by a secondary propeller 45 disposed above the second antivortex organ 40__ and integral in rotation with the axle 19. - The propeller second fi 45 has a p a "s or oriented in the same direction as the pitch of the main propeller 20.

On the other hand, the liquid accelerator also comprises an anti-vertex member 46 disposed above the secondary helix 45 and inside a cylindrical chimney 47. ~ * The chimney 47 is fixed on the inner edge of the reinforcing vanes. 41 so as to form with the cylinder 11 and between the reinforcement ribs 41, passages 48 for the liquid. The secondary propeller 45, the antivortex device 46 and the chimney 47 are located between the two series of windows 17 and 18 which, in this embodiment, are provided with views of means for regulating the flow rate of liquid and foam. sucked inside the cylinder 11. The rotation of the main propeller 20 causes a suction of the liquid 3 in the cylinder 11 by = the windows 17 and 18 in such a way that the liquid 3 circulates continuously from top to bottom in that cylinder 11. ^ "Otherwise, as a result of the rotation of the secondary propeller 45, the vacuum of the cylinder 3 on the cylinder 11 through the windows 17 and 18 will be closed, and a part of the liquid returns "to go up through the passages 48 disposed between the cylinder 11 and the chimney 47, 10 which accentuates even more, that phenomenon of acceleration of the liquid inside said cylinder 11. In that case also," the regulation of the level of liquid 3 inside the cylinder 11, it is always carried out by the position of the handles 22. and 23 with respect to the windows 17 and 18. The antiviral element 46 prevents the rotation of the liquid in the chimney 47. This embodiment "is particularly suitable for especially sparkling products. In fact, due to the acceleration of the suction of the liquid 3 inside the chimney 47 and of a recirculation of a part of that liquid in the steps 48, the floating foam on the surface of the liquid 3 is sucked into said chimney. 47. According to another embodiment shown in Fig. 7, the device includes means for aerating the surface of the liquid 3 inside the tank 1. As shown in this figure the means of "aeration of the surface of the liquid 3 are formed by a secondary propeller 50 disposed above the second anti-vertex member 40 and integral with the shaft 19 in rotation.

This secondary propeller 50 has an inverted passage with respect to the passage of the main propeller 20. The means for aerating the surface of the liquid 3 also comprise an anti-vertex element 51 arranged above the secondary helix 50 and inside a cylindrical chimney 52. The chimney 52 is fixed at the inner edges of the reinforcing ribs 48 so as to present with the cylinder-11 and said reinforcing ribs 48-steps 55 for the liquid 3. The secondary helix 50 and the antiviral organ 51 they are located between the two series of windows 17 and 18 the chimney 52 extends substantially from the middle part of the first series of windows "17 to the upper edge of the second series of windows 18. On the shaft 19 a cover 53 is mounted. by "above the upper edge of the chimney 52. The vertical position 1 of the cover 53 is adjustable so as to present together with the upper edge of the chimney 52 an adjustable passage 54. The rotation of the main propeller 20 causes a suction of the liquid 3 through the windows 17 and 18 in such a way that the liquid 3 circulates from below upwards in the cylinder 11. In this way, a part of the liquid 3 it is sucked into the cylinder 11_ by the windows 18 and another part of the liquid 3 is sucked by the windows 17 and circulates from top to bottom in the passages 55 disposed between, the chimney 52 and the indium ci 1. On the other hand, in view of the pitch of the secondary propeller 50 which is inverted with respect to the pitch of the main propeller 20, a part of the liquid is sucked into the chimney 52 from bottom to top and is projected into the air on the surface of the liquid 3 inside the funnel 14 going through step 54. In this way, the projection of a part of the liquid makes it possible to aerate the surface of the liquid 3 and thereby reduce the formation of foam on this surface. The antiviral member 51 prevents rotation of the liquid in the chimney 52 above the secondary helix 50. Likewise, in this embodiment, the flow rate of the liquid 3 in the cylinder 11 can be regulated by displacing the handles 22 and 23 with respect to windows 17 and 18. According to an embodiment shown in Figures F to 8 to 10, the device comprises a vortex pump 60"for suction of the liquid surface inside the cylinder 11. This vortex pump 60 is disposed above the second anti-vertex member 40 and at the level of the first series of windows.17. This vortex pump 60 is dragged in rotation by the bowl 19 and on the other hand comprises a circular disk 61 on this shaft 19 and provided on its upper face with radial and vertical blades 62. , on the other hand, a chimney 63 fixed on the upper edge of said blades 62. The assembly constituted by the disc 61, the blades 6"2 and the chimney 63 is maintained on the shaft 19 by means of a handle 61 a, coya on this tree 19 is adjustable. "~ The handle 61 a, is fixed on said tree 19 by means of an organ "constituted for example by a fixing screw, not shown." As shown in FIGS. 8 and 9, the upper edge of the blades 62 is equipped with a crown. 64 that extends towards the exterior of the chimney 63. This chimney 63 extends towards the top of the vat 1 sensibly from the middle part of the first series of windows 17 to the upstream edge of the vanes 62. fireplace 63 has an internal passage 65 communicates, in its lower part, with the interior of the cylinder 11 by annular steps 66, arranged between the blades 62 and between the crown 64 and the disc 61. Preferably, the chimney 63"is conical and the conicity is directed towards the upper part of the tank 1, as shown in Fig. 9. According to a variant, the chimney 63 can be cylindrical.The blades 62 are pineapple or curved and are preferably , three, regularly distributed on disk 6"! , as shown in FIG. 10. The rotation of the main propeller 20 causes a suction of the liquid 3 in the cylinder 11, through the windows 17 and 18_ such that said liquid 3 circulates continuously from top to bottom "in said cylinder 11.

On the other hand, the rotation of the vortex pump 60 driven by the shaft 19, that is to say the rotation of the assembly constituted by the disc 61, the teeth 62 and the chimney 63, causes an aspiration of the surface of the liquid 3 in step 65, such that this liquid passes through the annular steps 66 and is reinserted into the tank 1.

In this embodiment, it is not necessary to regulate the flow of liquid through the handles 22 and 23 inside the cylinder 11. "This embodiment is particularly suitable for very sparkling products, since the floating foam on the surface of the liquid 3 is sucked by the vortex pump 60 which allows this foam to be removed quickly and efficiently According to an embodiment shown in Figs 11 and 12, the device comprises a single-channel propeller 70 for suctioning the liquid 3 inside the cylinder 11. This single-channel propeller 70 is arranged above the second antiviral device 40 and at the level of the first series of windows 17. The single-channel propeller 70 is driven in rotation by the shaft 19 and comprises, on the one hand , a circular "" disk 71 fixed on this shaft 19 and arranged above the level of the liquid 3 in the tank l_.y, on the other hand, - inside the liquid 3, a vertical plate 72 forms a It is fixed on the lower face of said disk 71 around the shaft 19. As shown more particularly in FIG. 12, the plate 72 delimits a side entry 73 of the liquid, which extends over all the height of the liquid. said plate 72, a vertical channel 74 for circulating said liquid from above to below and a lower outlet 75 from said 1 i qu i dA. The one together constituted by the disc 71 and the vertical plate 72 is maintained on the shaft 19 by means of its handle 71 a, "whose vertical position on that shaft is adjustable." For this purpose, the handle 71 a, it is fixed on said shaft 19 by means of an organ constituted for example by "a fixing screw, not seated. The inner edge of the vertical plate 72 includes a vertical deflector 76 inclined in the direction of the center of the spiral formed by said plate 12. On the other hand, the distance separating the plate 72 and the axis of the. tree 19 decreases progressively, as shown in Fig. 12. The rotation of the single-channel propeller 70 carried by the shaft 19, "ie the rotation of the assembly constituted by the disk 71 and the plate 72 in the indicated system by the arrow in Fig. 12, causes an aspiration of the liquid inside said plate 72 through the inlet, lateral 73. That liquid is stirred inside the vertical channel 74 and circulates in that channel 74 above down to be evacuated inside the cylinder 11 through the lower outlet 75. The deflector 76 improves the agitation of the liquid inside the vertical channel 74 and prevents a return of the liquid through the side entrance 73. According to a last "embodiment" represented in FIG. 14, the device comprises a two-channel propeller 80 for suctioning the liquid 3 inside the cylinder 11. This double-stranded propeller 80 is disposed above the second anti-vertex member 40 and at the level of the first "series of windows 17.

The two-channel propeller 80 is driven in rotation by the shaft 19 and comprises, on the one hand, a circular disk 81 fixed on this shaft 19 and arranged above the level of the liquid 3 in the tank 1 and, on the other hand, inside the tank. liquid 3, two vertical plates 82 and 83. The vertical plates 82 and 83 are fixed on the underside of the disk 80 and each have the shape of two leaflets that are opposite and offset one from the other, such as. it has been shown in Fig. 14. The two plates 82 and 83 delimit two lateral inlets of liquid 84 and 85, two channels 86 and 87 of said liquids from above to below and a lower outlet 88 of said liquid .. The assembly constituted by the disc 81 and the vertical lacquers 82 and 83 is maintained on the shaft 19 by means of a handle 81 a , with vertical position in this tree 19 is adjustable. The handle 81 a is fixed to the shaft 19 by means of an organ constituted, for example, by a fixing screw, not shown.

As illustrated more precisely in FIG. 14, the edge of each plate 82 and 83 located opposite the channel 86"and 87 delimited by the other plate includes a vertical baffle, respectively 89 and 90. rotation of the two-channel propeller 80 dragged by the shaft 19, that is to say the rotation of the assembly constituted by the disk 81 and the two plies .ver ti cal is 82 and 83 in the direction indicated by the arrow in Fig. 14, causes an aspiration of the liquid 3 through the windows 17. That liquid penetrates through the lateral inlets 84 and 85 and is agitated inside the channels "86 and 87 and circulates upwards downwards inside those channels 86 and 87, then it is evacuated to the cylinder 11 through the lower outlet 88. A The deflectors 89 and 90 increase the agitation of the liquid inside the channels 86 and 87 and prevent that liquid from entering through the lateral inlets 84 and 85. In those last two embodiments, the regulation of the flow rate of liquid gone by the handles 22 and 23 of the cylinder 11 is not necessary, and those last two embodiments are more particularly used in the case where the level of liquid inside the cell 1 is variable. In order to improve the flow rate of the single-channel propeller 70 or of the two-channel propeller 80, a pump propeller, not shown, can be arranged on the shaft 19 below the single-channel helix or below the two-channel helix. The device according to the invention is applied "for example to the treatment of water, urban effluents, industrial wastewater, grease by biodegradation, drainage material, breeding waste, and in general any biodegradable industrial product. The device according to the invention can also be applied, for example, to the ozonation of water by means of an ozonated gas with or without a catalyst, to the stabilization of the slimes or it can be used in the thermophilic treatment or for charged liquid AL with suspended material eg organic or mineral. This device can also be used as a reactor "operating in a fluidized or moving bed." Finally, the device according to the invention has the advantage of treating the liquid and simultaneously eliminating progressively the floating foam on the surface of that liquid in the tank. treatment, and thus prevent this foam from contaminating the environment.-

Claims (33)

1. "A 1. Device for agitation for aeration of a liquid and for removal of foam:" - in a tank for treating said liquid, which contains inside: from the tank: a vertical cylinder that extends over a part of the tank. the height of the tank and having near the bottom of this tank at least one opening that accommodates at the bottom of A a tank for the passage of a funnel arranged around the upper part of the vertical cylinder and attached to said vertical cylinder; the upper edge of this funnel that has a free space in the wall of the tank for the passage of the liquid, and a main propeller located inside the vertical cylinder below the bottom of the funnel, a vertical motorized tree that extends through the inside of the vertical cylinder above this propeller and drag to it in rotary form, an anti-vertex body disposed inside the vertical cylinder, below said propeller, means of injection of a gas under pressure in the vertical cylinder, below of the antivortex organ, characterized in that it also comprises means of agitation only static by turbulence of liquid, inside the vertical cylinder, and these organs are disposed below the antivortex organ.
2. 2. The device according to the claim 1, characterized in that it also comprises: a first series of windows arranged in the upper part of the vertical cylinder and located at the same level as the one inside the funnel, a second series of windows arranged in the vertical cylinder, above the bottom of the funnel, and means of regulating the level of the liquid in the funnel.
3. 3. The device according to the claim 2, characterized in that it comprises means for regulating the flow rate of the liquid and the foam sucked by the propeller, inside the vertical cylinder.
4. 4. The device according to the indication 3, characterized in that the means for regulating the flow rate of the liquid and the foam expelled by said propeller are formed, on the one hand, with a first handle arranged around a vertical cylinder therein. level than the first series of windows, and on the other hand, by a second handle arranged around said vertical cylinder at the same level as the second series of windows. The position of said handles, in relation to the corresponding windows, is regulated vertically.
5. 5. The device according to any one of the preceding claims, characterized in that the means of static agitation by turbulence are formed on the one hand, by a vertical tube arranged inside the vertical cylinder and extending from the bottom of the curve to below the anti-vortex organ, and "on the other hand, by static obstacles superimposed, in the interior -of said vertical cylinder and fixed in said tube.
6. 6. The device according to claim 5, characterized in that the static obstacles have, with the internal wall of the vertical cylinder, steps for the circulation of liquid.
7. 7. The device according to claims 5 and 6, characterized in that the static obstacles are regularly spread throughout the portion of the tube disposed in the vertical cylinder.
8. - 8. The device according to the claims 5 and 6, characterized in that the static obstacles are distributed in the tube on the one hand below the antivortex organ, and on the other hand on the lower part of the vertical cylinder.
9. 9. The device according to claim 5, characterized in that the turbulence stirring means are formed by static obstacles fixed in the internal wall of the vertical cylinder and providing an axial passage for the circulation of the liquid.
10. 10. The device according to the claim 9, characterized in that the static obstacles are distributed regularly throughout the portion of the vertical cylinder located below the anti-vortex member.
11. 11. The device according to claim 10, characterized in that the static obstacles are distributed in the interior of the vertical cylinder on the one hand, under the anti-vertex member, and on the other hand on the lower part of said vertical cylinder.
12. 12. The device according to any one of claims 1 to 11, characterized in that the static obstacles are formed by recesses with cavity is directed towards the bottom of the tank.
13. 13. The device according to any one of claims 5 to 11, characterized in that the static obstacles are formed by disks.
14. 14. The device according to any one of the preceding claims is isolated.
15. 15. The device according to any one of the preceding claims in which the means for regulating the level of the liquid in the funnel are formed by a spill hose disposed inside said funnel and whose position is vertically regulated.
16. 16. The device according to any one of the preceding claims, characterized in that it comprises a second antivortex organ disposed inside the vertical cylinder and above the main propeller; this second anti-vortex member is formed by at least two vertical plates, each extended upwards by a reinforcing rib, which extend to the upper end of said vertical cylinder.
17. 17. The device according to any one of the preceding claims, characterized in that it comprises a liquid accelerator inside the vertical cylinder.
18. 18. The device according to any one of the preceding claims, characterized in that the liquid accelerator is formed on the one hand by a secondary propeller arranged above the second anti-vortex angle and integral in rotation with the shaft and with a pitch oriented towards it. sense that the passage of the main propeller, and on the other hand, by an anti-vortex organ disposed above the helix, would be secondary and inside a cylindrical chimney fixed on the reinforcing ribs. The secondary helix, antiviral organ and chimney are located between the two series of windows.
19. 19. The device according to any one of claims 1 to 16, characterized in that it comprises means for aerating the surface of the liquid inside the tank.
20. 20. The device according to any one of claims 1 to 16 and 19, characterized in that the means for aerating the liquid surface are formed, on the one hand, by a secondary helix disposed above the second order or anti-vortex, integral with rotation with the tree and of inverted passage with respect to the passage of the main propeller, and on the other hand, by an anti-vertex organ disposed above the secondary helix and inside a cylindrical chimney fixed to the reinforcement ribs. The secondary helix and the anti-vortex organ are "located between the two series of windows and the chimney extends substantially from the median part of the first window series to the upper edge of the second series of windows.
21. 21. The device according to claim 20, characterized in that a leg is mounted on the shaft above the upper edge of the chimney and has a corresponding passage with said upper edge.
22. 22. The device according to any one of claims 1 to 3"and 5 to 16, characterized in that it comprises a vortex pump for suction of the liquid surface inside the vertical cylinder, arranged above the second anti-vertex body and at the same level as The first series of windows.
23. 23. The device according to claim 22, characterized in that the vortex pump has, on the one hand, a circular disk fixed in rotation with the shaft and provided on its upper surface with radial and vertical blades, and on the other hand, a chimney fixed on the edge The upper part of the blades and which extends towards the top of the leaks, extends substantially from the median part of the first series of windows to said upper edge of the blades.
24. 24. The device according to the claim 23, characterized in that the chimney is conical and whose conicity is directed towards the upper part of the fugue.
25. 25. The device according to the claim 23, characterized in that the chimney is cylindrical.
26. 26. The device according to claim 23, characterized in that the blades are flat or not curved.
27. 27. The device according to any one of claims 1 to 3, and 5 to 16, characterized in that it contains a single-channel liquid suction impeller inside the vertical 1-cylinder, arranged by the second anti-vertex body and at the same level as the first series of windows.
28. 28. The device according to claim 27, characterized in that_ the single-channel helix contains, on the one hand, a circular disk fixed in rotation with the shaft and arranged above the level of the liquid in the tank, and on the other hand, inside the liquid a vertical plate that forms a spiral and fixed on the lower surface of said disc around the tree, said plate delimits a lateral entrance of the liquid, a vertical channel of circulation of this liquid that goes from the top to the bottom and a bottom outlet of said 1 í qui do.
29. 29. The device according to claim 28, characterized in that the internal border of the vertical plate contains a vertical deflector inclined in the direction of the spiral center.
30. 30. The device according to any one of claims 1 to 3 and 5 to 16, characterized in that c o_n has a two-channel liquid suction propeller inside the vertical cylinder, arranged above the second anti-vertex member and at the same level as the first series. of windows.
31. 31. The device according to claim 30, characterized in that the two-channel propeller contains, on the one hand, a circular disk fixed in rotation with the shaft and arranged above the level of the liquid in the tank and, on the other hand, inside the liquid, two vertical plates fixed on the underside of said disk and having the shape of two smi ca s that are opposed and out of phase with respect to each other. Said plates delimit two lateral entrances of liquid, two vertical channels of circulation of this liquid from high to low and a lower outlet of said liquid.
32. 32. the device according to claim 31, characterized in that the edge of each plate located in front of the channel delimited by the other plate contains a deflector located in front of the channel delimited by the other plate contains a vertical deflector.
33. 33. The device according to claim 27 and 30, characterized in that a pumping propeller is fixed to the shaft under the single-channel helix or the two-channel helix.