RU2103046C1 - Method of water clarification - Google Patents

Abstract

FIELD: water treatment, in particular, methods of classification, thickening and separation of flocculated particles; may be used in mineral concentration for clarification of circulating water, and treatment of industrial, household potable waters and sewage waters. SUBSTANCE: after floatation separation of coagulated sludges, airfloccules and hydrophobic impurities and separation of solid particles, sludge floccules and hydrophilic impurities by their precipitation in aqueous medium, water is saturated with air bubbles by pneumohydraulic aerator with use of pressure water after preliminary electrochemical treatment directly before pneumohydraulic aeration, and repeated flotation separation of coagulated sludges, air floccules and hydrophilic impurities and separation of solid particles, sludge floccules and hydrophilic impurities by their precipitation in aqueous medium after which water is saturated with air bubbles with use of ozone-air mixture, and again remaining impurities are separated by similar manner. Water saturation with air bubbles by pneumohydraulic aerator and flotation separation of coagulated sludges, airfloccules and hydrophobic impurities are carried out in adjacent zones of one chamber separated by vertical perforated partitions with gap at their lower edges. Jet mixing of water performed by pneumohydraulic aeration is limited only by zones of its saturation with air bubbles without concerning the flotation zones. EFFECT: higher efficiency. 2 cl, 3 dwg

Description

 The invention relates to water treatment, and in particular to methods for classifying, thickening and separating particles and can be used in mineral processing for clarification of recycled water and in the treatment of industrial, household and wastewater.

 A known method of water clarification, including introducing a flocculant solution into water, saturating it with air bubbles, flotation separation of aeroflocs, oil products, surface-active and oily substances, hydraulic separation of solid particles and sludge flocs by precipitation in an aqueous medium in which hydraulic separation of solid particles and sludge flocs by sedimentation is carried out after flotation separation of aeroflocs, oil products, surfactants and oily substances, sedimentation and flotation separation e is carried out in adjacent zones of one chamber, interconnected by the principle of communicating vessels, in one upstream branch of which they carry out flotation of the hydrophobic part of the contaminants, and in the other, downstream branch, the hydrophilic part of the contaminants, and water is saturated with fine air bubbles from pneumatic aeration, from during the flotation of the foam product, the aqueous phase with the surfactants contained in it is isolated, which is used with pneumohydro vlicheskoy aeration [1].

 The method is implemented in a device for water clarification [1], comprising a vertically mounted chamber for circulating water with a device for supplying untreated water and a nozzle for unloading sludge, a gutter for draining contaminated water and purified water, mounted outside its chamber on its upper edge, located in the chamber a package of inclined parallel precipitation plates, at least one dividing wall, in which the chamber for water circulation is equipped with pneumohydraulic aerators, paired coaxially placed on the of its opposite side walls above the separation partition, which is inclined towards the side of the device for supplying untreated water and divides the chamber into flotation and deposition zones located respectively above and below the partition, while the flotation and deposition zones communicate in the lower part of the chamber under the lower edge of the separation the partition, under which the nozzle for discharging sludge is located, the device is equipped with a precipitation chamber with a vertical separator installed under the chute for draining contaminated water a septum located inside the chamber with a gap in relation to its bottom and fixed on the side walls of the chamber and the bottom of the gutter to drain contaminated water with the formation of two parts, one of which adjacent to the gutter on the side communicates with its internal cavity and has in the upper part adjustable overflow threshold, and the other, located under the bottom of the gutter and adjacent to it from below, is equipped with a pipe located in its upper part for outputting the aqueous phase, while the overflow edge of the adjustable threshold is located above the outlet th hole of the nozzle for the output of the aqueous phase by a value proportional to the difference in the densities of clarified water and oily contaminants containing gaseous, aqueous and solid phases, the chute for draining the purified water is placed below the upper edge of the inclined dividing wall, the overflow edge of the chamber above the chute for draining the purified water is placed below the overflow edge above the chute for draining contaminated water by an amount proportional to the density difference between aerated and non-aerated liquids. The device is equipped with two blocks, each of which has a compressed-air cylinder and receiver for pressure water with respectively air inlet and water inlets located under the chute for draining contaminated water, while pneumohydraulic aerators are placed in blocks, each aerator is equipped with a tubular body with placed inside it, inlet and outlet bushings made of wear-resistant material, for example, siliconized graphite or cermets, aerator shells with one end face They are mounted in a lot on the side wall of the chamber for water circulation, and on the other side, on the adjacent wall between the receiver cylinder and the manifold for pressure water, the output nozzles of the pneumohydraulic aerators are directed inside the circulation chamber, and the inlet openings of the aerators are directed inside the manifold for pressure water, tubular aerator bodies have an annular groove on the inner surface mating with the inner cavity of the receiver tank for compressed air, the inlet and outlet bushings have through holes for pressure water, out one sleeve has a section in the axial hole with tangential passages for compressed air coming from the annular grooves of the aerator housing [1].

 The disadvantage of this method is that it does not have operations that provide intensive coagulation of colloidal particles. It does not have sequential operations to saturate water with finely dispersed gas and air bubbles separately from the flotation separation of aeroflocs. While carrying out these operations, jet mixing of water by pneumohydraulic aeration partially destroys the already formed flotation complexes, which leads to a deterioration of aerohydrodynamic conditions for the separation of hydrophobic contaminants, a decrease in the efficiency of the water clarification process, the quality of its cleaning and the productivity of the apparatus. The disadvantages of the method include the lack of operations of disinfection of water in it.

 The soothing gratings and plates used in the device [1] to reduce intra-chamber turbulence in this case are insufficient to preserve the already formed flotation complexes, since they are located directly in the zone of jet mixing of water when it is saturated with air bubbles by pneumohydraulic aeration.

 The closest in technical essence and the achieved result is a method of clarification of water, including the introduction of a flocculant solution into water, saturation with air bubbles, flotation separation of aeroflocs, oil products, surface-active and oily substances, the allocation of solid particles and slurry flocs by sedimentation in an aqueous medium in which the separation of solid particles and sludge flocs by precipitation is carried out after flotation separation of aeroflocs, oil products, surface-active and oily substances c, deposition and flotation separation are carried out in adjacent zones of one chamber, interfaced according to the principle of communicating vessels, while water is saturated with fine air bubbles by pneumohydraulic aeration, the aqueous phase with the surface-active substances contained in it is isolated from the foam product obtained by flotation, which is used for pneumohydraulic aeration [2].

 The method is implemented in a device for water clarification [2], comprising a vertically mounted chamber for circulating water with a device for supplying untreated water and a nozzle for unloading sludge, gutters for draining contaminated water, an inclined parallel package located outside the chamber on its upper edge, located in the chamber precipitation plates, at least one dividing wall, in which the chamber for water circulation is equipped with pneumohydraulic aerators, pairwise coaxially placed on opposite sides its new walls above the dividing wall, which is inclined towards the device for supplying untreated water and divides the chamber into flotation and deposition zones located respectively above and below the baffle, while the flotation and deposition zones communicate in the lower part of the chamber under the lower edge of the dividing wall , under which there is a pipe for unloading sludge, the device is equipped with a central precipitation chamber with vertical separation walls installed inside the chamber with a gap in relation to its bottom and mounted on the side walls of the chamber and the bottom of the chute for draining contaminated water, while the inner cavity formed by vertical partitions communicates with the chute for draining contaminated water and has adjustable overflow thresholds in the upper part, and the outer cavity formed by the walls sedimentation chamber and vertical partitions, equipped with a pipe located in its upper part for outputting the aqueous phase, and the overflow edge of the adjustable threshold is located above the level of the outlet the nozzle for the output of the aqueous phase by a value proportional to the difference in the densities of clarified water and oily contaminants containing gaseous, aqueous and solid phases, the chute for draining the purified water is located below the upper edge of the inclined dividing partition, the overflow edge of the chamber above the chute for draining the purified water is located below overflow edge above the chute for draining contaminated water by a value proportional to the difference in density of aerated and non-aerated liquid.

 The device is equipped with two blocks, each of which has a compressed-air cylinder and receiver for pressurized water with respectively air inlet and water inlets located under the chute for draining contaminated water, while aerators are placed in blocks, each aerator is equipped with a tubular body with an inlet and output bushings, tightly mounted with one end in the side wall of the chamber for water circulation, and the other in the adjacent wall between the receiver cylinder and the manifold for pressure water, the output nozzles non-hydraulic aerators are directed inside the chamber for circulation, and the inlet openings of the aerators are inside the manifold for pressure water, the outlet sleeve of the aerator body has a section in the axial hole with tangential passages for compressed air, the inner surface of the tubular body is made with an annular groove connected to the inner cavity of the cylinder receiver, the chamber for water circulation is made double with a mutually symmetrical mirror arrangement of its two halves with respect to the precipitation chamber, while the latter is positioned between the halves and is for both halves of the total.

 The method [2] due to the dual execution of the chamber for the circulation of water, where this method is implemented, and reducing as a result of this the intensity of the intracameral flows partially eliminates the disadvantages of the method [1]. At the same time, it also has the disadvantages of the method [1], since in this case there are no operations that ensure intensive coagulation of colloidal particles, and it does not have sequential operations to saturate water with finely dispersed gas and air bubbles separately from flotation separation of aeroflocs, which reduces the efficiency of the process of clarification of water and the quality of its treatment. The disadvantages of the method should also include the lack of disinfection of water in it.

 The aim of the invention is to increase the efficiency of the process of clarification of water and the quality of its treatment by improving the aerohydrodynamic conditions for the separation of colloidal and suspended particles and hydrophobic contaminants.

 The goal is achieved in that in a method of clarifying water, comprising introducing a solution of a coagulant and (or) a flocculant into water, saturating it with air bubbles with pneumohydraulic aeration, flotation separation of coagulated sludge, aeroflocules and hydrophobic contaminants, the allocation of solid particles, sludge flocculates and hydrophilic contaminants by their sedimentation in the aquatic environment, after flotation of coagulated sludge, aeroflocules and hydrophobic contaminants and the separation of solid particles, sludge floccules and hydrophilic contaminants thereby, their deposition in the aquatic environment causes water to be saturated with air bubbles by pneumohydraulic aeration using pressure water that has undergone preliminary electrochemical treatment immediately before pneumohydraulic aeration and re-flotates the coagulated sludge, aeroflocs and hydrophobic contaminants and separates solid particles, sludge flocs and hydrophilic contaminants sedimentation in an aqueous medium, after which water is saturated with air bubbles using ozone-air mixture and once again emit the remaining contaminants in a similar way, the saturation of water with air bubbles by pneumohydraulic aeration and the flotation separation of coagulated sludge, aeroflocules and hydrophobic contaminants are carried out in adjacent zones of the same chamber, separated by vertical perforated partitions with a gap at their lower edges, and jet mixing carried out by pneumohydraulic aeration is limited only by the zones of its saturation with air bubbles, without affecting When this flotation zone.

 When creating the invention, the authors proceeded from the following.

 The use of coagulants and flocculants to intensify the release of colloidal and sludge impurities from recycled and household water requires the provision of the necessary conditions to prevent the destruction of aggregate flakes, flocculant molecules and sludge flocs and aeroflocs formed with their help, since the destruction of these reagents dramatically reduces the efficiency of use of these reagents. At the same time, the efficiency and quality of water treatment and the performance of the apparatus are reduced. The destruction of aggregate flakes and aeroflocles can be prevented by transferring the turbulent regime of the aerated liquid, necessary for mixing water with a solution of coagulant and flocculant, into the laminar regime necessary for the separation process. This is achievable with separate operations of saturation of water with gas and air bubbles and flotation separation of aeroflocs and hydrophobic pollution.

 For finer dispersion of air required for flocculating flotation of aggregated colloidal particles and sludge and hydrophobic contaminants, it is advisable to use pneumohydraulic aeration, for which it is rational to use the liquid phase isolated from the foam flotation product, as it is enriched with surface-active substances, extracted from untreated water during its flotation treatment. In this case, it is advisable to carry out its preliminary electrochemical treatment to intensify electrochemical and adsorption processes, saturate water with hydrogen and oxygen bubbles, capable of carrying fine particles from the liquid volume to its surface, and also to initiate electrophoretic movement of suspended solid and colloidal particles and gas bubbles in water. In addition, this water treatment provides the possibility of electrochemical coagulation of colloidal and suspended particles, which allows to reduce the consumption of substances such as coagulants, as well as the ability to more finely control the process of water clarification in its intensive mode. For water disinfection, it is rational to use the ozone-air mixture as the gas phase during pneumohydraulic aeration. In order to increase the efficiency of the clarification process and the quality of water treatment, the removal of contaminants should be carried out sequentially by various methods.

 In FIG. 1 shows a General view of the apparatus for clarification of water (with a longitudinal section); in FIG. 2 is a side view of the apparatus in partial section; in FIG. 3 - node 1 in figure 2 on an enlarged scale, depicting a pneumohydraulic aerator and its placement in the block (longitudinal section).

 The apparatus for clarifying water contains (see FIGS. 1 and 2) a vertically mounted pyramidal chamber 1 for circulating the water to be purified. Adjacent to the chamber 1 is a device 2 for supplying untreated water, and in its lower part there are fixed nozzles 3 for discharging sludge. To increase the productivity of the apparatus, the chamber 1 for water circulation is made double with a mutually symmetrical mirror arrangement of its two halves. Accordingly, the device 2 for supplying untreated water was also made. In the upper part of the chamber 1, on its inner side, chutes 4 are also mirrored for draining water containing its flotative part. Inside the chamber 1 there are dividing partitions 5, installed with a gap 6 in relation to the bottom of the chamber 1. The partitions 5 are inclined from the vertical to the opposite sides and are tightly fastened with their upper edges to the outer opposite parts of the device 2. The lower edges of the partitions 5 are located above the nozzles 3 for sludge discharge. The lateral edges of the partition 5 are tightly fixed to the side walls of the chamber 1. Under the dividing partitions 5, parallel to them are placed packages of inclined plates 7, supported by their lower edges on vertical ribs 8, which are fixed with their end edges to the partition walls 5 and the lower inclined walls of chamber 1. These the walls of the chamber 1 are parallel to the dividing partitions 5. To their upper edges are attached the grooves 9 for draining the purified water with nozzles 10 for withdrawing the purified water from the apparatus. The level of these edges is below the level of the overflow edges of the chamber 1 along the grooves 4 by an amount proportional to the density difference between the aerated and non-aerated liquids, which ensures the simultaneous and continuous overflow of the foam product and purified water from the chamber 1. From the side walls, the chamber 1 has symmetrically located zones 11 for saturating water with air bubbles, between which zones 12 are located for flotation separation of hydrophobic contaminants. Zones 11 and 12 are separated by vertical perforated partitions 13 with a gap 14 at their lower edges with respect to the dividing partition 5. In the upper part of the chamber 1 above the zones 11 for air saturation with air bubbles, pneumohydraulic aerators 15 are uniformly placed, the axes and output nozzles of which are directed down along the perforated partitions 13.

 The fixture 2 for supplying untreated water is made in the form of a T-shaped distribution manifold 16 mirror-symmetrically located above the chamber 1 for water circulation, having slotted outlets 17 in the lower transverse sections to the flotation zones 12 of the chamber 1. At the ends of the transverse sections, the distribution manifold 16 is connected through nozzles 18 with an internal cavity of zones 11 for saturation of water with air bubbles. In its upper part, the distribution manifold 16 is equipped with a pipe 19 for receiving raw water, having a wear resistant lining 20 in its lower part.

 The gutters 4 are made integral with the precipitation chamber 21 located below them. The precipitation chamber 21 is fixed to adjacent walls of the chamber 1 for water circulation and is located between two mirror symmetrically located halves, being common to both halves. Inside, it is equipped with vertically arranged dividing walls 22 installed parallel to the adjacent walls of the chambers 1 and 21 with a gap 23 relative to the bottom of the precipitation chamber 21. The dividing walls 22 are tightly fixed to the side walls of the precipitation chamber 21 and the bottoms of the grooves 4 and divide the internal cavity of the precipitation chamber 21 into three parts, one of which 24 is central connected with the inner cavity of the grooves 4 and has in its upper part overflow adjustable thresholds 25 located on opposite side walls x chambers 21, and the other two 26 are equipped with nozzles 27 located in their upper parts for outputting the aqueous phase. The level of overflow edges of adjustable thresholds 25 are located above the outlet openings of the nozzles 27 by a value proportional to the difference in the densities of clarified water and oily contaminants containing gaseous, aqueous and solid phases, which ensures simultaneous and continuous discharge of oily contaminants and aqueous phase when the foam product is stratified into its phases in the precipitation chamber 21. In its lower part, the precipitation chamber 21 is equipped with a nozzle 28 for unloading the sand product and sludge, and in It part of the receiver 29 with nozzles 30 for discharging the oil.

 Pneumohydraulic aerators 15 are installed on the chamber 1 for water circulation in four blocks 31, each of which has a cylinder-receiver 32 for compressed air and a manifold 33 for pressure water, located in pairs above the zones 11 for saturation of water with air bubbles. Each of the aerators 15 has (see Fig. 1-3) its own tubular-shaped body 34 tightly (on welding) mounted with its lower end in the upper edges 35 of the chamber 1 above the zones 11. The output nozzles of the pneumohydraulic aerators 15 are turned into the zone 11 of the chamber 1, and their inlets into the manifold 33 for pressure water. Inside the tubular body 34 there are placed an input 36 and an output 37 sleeve made of a wear-resistant material, for example, siliconized graphite or cermet having through holes 38 for pressure water. The output sleeve 37 has in the axial hole a portion 39 of a larger diameter with tangential passages 40 for compressed air. The bushings 36 and 37 are fixed in the housing 34 by means of a nut 41 through the gasket 42. On the inner surface of the tubular housing 34 there is an annular groove 43 connected through holes 44 to the internal cavity of the receiver 32, and through tangential passages 40 with a portion 39 of the aerator outlet sleeve 37 15, which ensures the passage of compressed air from the cylinder receiver 32 to each of the aerators 15. The cylinder receiver 32 has an air inlet pipe 45. The manifold 33 for pressure water has a water inlet pipe 46, as well as hatches 47 with sealed covers 48, put in front of each of fluid aerator 15 and intended for replacement of wearing parts aerators 15.

 When the apparatus for water clarification is operating, the chamber 1 for circulating water to be purified is filled through the pipe 19 and the distribution manifold 16 with untreated water with a coagulant or high molecular weight flocculant added (if necessary) to it. Untreated water with a coagulant (flocculant) from the slotted outlets 17 enters directly into the flotation zones 12 of the chamber 1, along their entire width, and through the nozzles 18 it first enters into the zones 11 to saturate the water with air bubbles, and after that it passes through the holes in the vertical perforated septum 13 and the gap 14 into the flotation zone 12, where it is mixed with water entering this zone from the slotted outlets 17. Simultaneously with filling the chamber 1 with water, pneumohydraulic aerators 15 are put into operation, for which each cylinder ep 32 through pipe 45 is fed the compressed air and into each reservoir 33 via a pipe 46 with water under pressure, past pre-electrochemical treatment immediately before the fluid aeration. When a high-speed jet of aerated liquid passes through section 39, acoustic vibrations are generated in its cavity, which contribute to a fine dispersion of gas and air in the aqueous medium, and air is ejected from it, which is continuously replenished from the compressed air receiver 32 through openings 44 in the tubular body 34 , annular grooves 43 and tangential passages 40. In section 39, air is accelerated to high speeds due to its tangential flow through tangential passages 40, while the fluid velocity vectors Air does not coincide, which also promotes a finer dispersion of air. The thinnest gas bubbles come with pressure water that has undergone preliminary electrochemical treatment.

 When filling chamber 1 with untreated water and aerated liquid, a foam layer forms on the surface of the water, indicating the presence of surface-active substances in it. This foam layer upon reaching the level of the upper edge of the chamber 1 is poured through this upper edge into the grooves 4 for draining contaminated water. The untreated water entering the zones 11 of the chamber 1 from the device 2 with the coagulant (flocculant) is mixed with jets of aerated liquid coming out of the nozzles of the pneumohydraulic aerators 15 and saturated with finely dispersed gas and air bubbles. Upon receipt of untreated highly aerated water with a coagulant (flocculant) in flotation zone 12, aggregate flakes and aeroflocules of hydrophobic sludge formed due to gas and air bubbles, together with other hydrophobic contaminants of the water, float in the foam product. Their flotation is carried out in laminar mode, since the jet mixing of untreated water, carried out in a turbulent mode in zone 11, is separated from the flotation zone 12 by a vertical perforated partition 13. The hydrophilic part of the contaminants and sludge flocs falls down and surrounds the separation walls 5 with water under their lower edges and through the gaps 6, it enters the precipitation zones of the chamber 1 located under the dividing partitions 5. When enveloping the fluid flow around the dividing partitions 5 from it into the bulk of the formed slurry flocs and solid particles in the water falls down and is discharged from the apparatus through nozzles 3 located directly under the dividing walls 5. The remaining part of the hydrophilic particles and sludge flocs is picked up by the water flow and passes through the packages of inclined plates 7, where thin layer separation of liquid and solid phases occurs. The solid phase settles on the plates 7 and rolls down along their inclined surface and is discharged from the apparatus through the nozzles 3. The liquid phase, which is purified water, is poured from the chamber 1 into the chutes 9 to drain the purified water and is discharged from the apparatus through the nozzles 10. Simultaneously and the continuity of the overflow of contaminated and purified water from the chamber 1 is ensured by the fact that the level of overflow of purified water into the gutter 9 is located below the level of overflow of contaminated water into the gutter 4 by a value proportional to the difference in the density of aerier water and non-aerated liquid, and flotation and precipitation zones of chamber 1 are interconnected according to the principle of communicating vessels.

 Overflowing into the trough 4, the foam product enters the precipitation chamber 21, divided by partitions 22 into three parts according to the principle of communicating vessels. In one of its central parts 24, the foam product is stratified into its phases. Oily products, as lighter, are mixed into the upper layers of the mixture and poured when the settling chamber 21 is filled through adjustable overflow thresholds 25 to the receivers 29 and are discharged from the apparatus through the nozzles 30. The aqueous and solid phases, as heavier ones, move to the lower layers of the mixture. The solid phase is discharged from the precipitation chamber 21 through the nozzle 28. The water phase through the gaps 23 enters the other two parts 26 of the precipitation chamber 21 and is discharged from it through the nozzles 27. The simultaneous and continuous discharge of oily products and water from the precipitation chamber 21 is ensured by the overflow the edge of the adjustable thresholds 25 is located above the level of the outlet openings of the nozzles 27 for outputting the aqueous phase by an amount proportional to the difference in the densities of clarified water and oily contaminants containing gaseous, aqueous and solid phases, and the three parts 24 and 26 of the settling chamber 21 are conjugate with each other according to the principle of communicating vessels.

 The aqueous phase containing surfactants extracted from untreated water during its flotation treatment is used as pressure water for the operation of pneumohydraulic aerators 15, for which it is pre-treated in an electrolyzer and then fed through nozzles 46 to pressure water collectors 33. The use of this aqueous phase as pressure water during pneumohydraulic aeration ensures the saturation of water with gas bubbles during its preliminary electrochemical treatment, necessary for coagulation of colloidal particles, as well as fine dispersion of air and stable operation of aerators 15 without coalescence of bubbles in the volume of aerated water, which ensures its high-quality cleaning up. In this case, disinfection of the treated water is carried out using the ozone-air mixture as the gas phase during pneumohydraulic aeration. In order to improve the efficiency of the clarification process and the quality of water purification, the removal of contaminants should be carried out sequentially by various methods in accordance with the proposed method, passing the purified water three times through the apparatus of the above construction. Why rationally use a technological chain of three such devices.

 Thus, the proposed technical solution in comparison with the prototype will allow due to the improvement of aerohydrodynamic conditions for the separation of colloidal and suspended particles and hydrophobic contaminants to increase the efficiency of the process of clarification of water and the quality of its treatment.

Literature
1. Zlobin M.N. Development and industrial development of flotation technology and equipment for the extraction of diamonds from ores, doct. Diss. 1995, p. 27.28.

 2. Zlobin M.N. Development and industrial development of flotation technology and equipment for the extraction of diamonds from ores, doct. Diss. 1995, p. 27-29, Fig. 6, (prototype).

Claims (2)

 1. A method of clarifying water, including introducing into the water a solution of a coagulant and (or) a flocculant, saturating it with air bubbles with pneumohydraulic aeration, flotation separation of coagulated sludge, aeroflocules and hydrophobic contaminants, the allocation of solid particles, sludge flocs and hydrophilic contaminants by sedimentation in an aqueous medium characterized in that after the flotation separation of coagulated sludge, aeroflocules and hydrophobic contaminants and the separation of solid particles, sludge floccules and hydrophilic contaminants by and x deposition in the aquatic environment, water is saturated with air bubbles by pneumohydraulic aeration using pressure water that has undergone preliminary electrochemical treatment immediately before pneumohydraulic aeration, and re-flotation is carried out for coagulated sludges, aeroflocules and hydrophobic contaminants and the separation of solid particles, sludge flocs and hydrophilic pollution sedimentation in an aqueous medium, after which water is saturated with air bubbles using em ozone mixture and again separated the remaining contamination in a similar manner.  2. The method according to claim 1, characterized in that the saturation of water with air bubbles by pneumohydraulic aeration and flotation separation of coagulated sludge, aeroflocules and hydrophobic contaminants is carried out in adjacent zones of one chamber separated by vertical perforated partitions with a gap at their lower edges, and jet mixing of water carried out by pneumohydraulic aeration is limited only by the zones of its saturation with air bubbles, without affecting the flotation zones.

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