RU2696434C1 - Method of purifying and preparing water in closed water supply systems for growing aquaculture - Google Patents

Abstract

FIELD: water and air purification technology.

SUBSTANCE: invention relates to preparation of water for cultivation of aquaculture. Method of purifying and preparing water in closed water supply systems for growing aquaculture involves a step of sampling 2 contaminated water from pool 1 or pools with aquaculture from any horizontal level of basin 1 or pools, step of primary mechanical treatment of collected water 3, carried out on filter with separation lamellas, stage of biological treatment of water 4, carried out on filter with bio-charging in pseudo-boiling layer at unidirectional movement from bottom to top of purified water and air, stage of secondary fine mechanical cleaning 5, carried out on filter with separation lamellas, stage of disinfection of water 7 by ozonation with simultaneous enrichment of water with oxygen at use of gas ozone-oxygen mixture under pressure of 1.05–1.40 bar with further maintenance of treated water at atmospheric pressure and control of final amount of ozone. At each purification step disposal of separated mechanical impurities 8 is provided. Water is circulated by pump 6. Cleaning equipment is connected in series in accordance with the sequence of said stages and placed on the process line to pump 6. Devices for ozonation, enrichment of water with oxygen and control of final amount of ozone are placed on pressure line of pump 6. Simultaneously, the equipment is installed so that the upper level of water in the mechanical filters and the upper level of the biofilter pseudo-boiling layer are made at the level of the pool or aquariums basins with vertical accuracy of -0.20 m and pump suction level at pool or aquarium pool level with vertical accuracy up to -0.50 m.

EFFECT: invention reduces power consumption, increases degree of purification, efficiency of using oxygen and ozone-oxygen mixture, and improves operation reliability.

5 cl, 1 dwg

Description

The invention relates to methods for breeding aquatic animals, namely to methods for purifying and preparing water for growing aquaculture.

Currently, there are many ways to purify and prepare water for growing aquaculture. In most cases, they relate to closed water supply (UZV) installations in which water purification and treatment processes are carried out sequentially. Thus, there is a known method of water purification in swimming pools for the development of living organisms, including a controlled supply of contaminated water to a sectional filter, purification in filter sections at different loads / fillers, including bio-loading, located on a single mesh bottom, and also an adjustable compartment alternating with water inlet sludge (international application WO 2005048700 (A2), 02.06.2005, MKI A01K 61/00, A01K 63/04).

Also known is a method of purification and preparation of water, including ensuring the availability of a number of reservoirs for aquaculture, ensuring water circulation, ensuring feeding, separation of solid impurities from water and their removal, bio-purification of water, oxygenation and return to aquaculture tanks, temperature control, while the tank system and equipment has a modular structure in which the tanks are interconnected by pipelines (US patent US 9497941, MKI A01K 63/04 A01K 61/00).

The disadvantages of the above methods are the increased energy costs of a full cycle of purification and preparation of water, the insufficient degree of purification from mechanical impurities, the low efficiency of using oxygen and an ozone-oxygen mixture in disinfection and oxygenation of water.

The closest set of essential features to the claimed invention is a method of treating water, including the selection of contaminated water, mechanical cleaning on a drum filter, biological treatment with simultaneous aeration by bubbling, denitrification of part of the water without oxygen, pH adjustment, disinfection by ultraviolet treatment and ozonation, and also oxygenation by passing through an oxygen cone, while the levels of the mirror of the pool with aquaculture, water intake after bioremediation, wasp and line in different oxygenators (Website of "SIMEON AkvaBioTehnologii" - http://www.simeon-aquabio.ru/base_znany/uzv_sov/). The disadvantages of the method are:

- high energy costs for maintaining water circulation due to the location of units of equipment at different levels;

- insufficient purification from mechanical impurities due to water pollution at the output of the bio-purification and denitrification stage;

- low efficiency of using oxygen and ozone-oxygen mixture in the processes of disinfection and oxygen saturation of water;

- low reliability of operation and maintainability of the system due to the impossibility of maintaining a stationary water level in units of equipment in case of failure of the circulation system.

The solved problem of the claimed invention is to eliminate the disadvantages of the above technical solutions and achieve a technical result in relation to:

- reduction of energy costs of a full cycle of purification and preparation of water in closed water supply plants for aquaculture cultivation;

- increasing the degree of purification from mechanical impurities;

- increasing the efficiency of use of oxygen and the ozone-oxygen mixture in disinfection processes and oxygen saturation of water;

- improving the reliability of operation and maintainability of the system due to the possibility of maintaining a stationary water level in units of equipment in case of failure of the circulation system.

The achievement of the specified technical result in the claimed invention is achieved by implementing a set of essential features in the method of purification and preparation of water in closed water supply systems for growing aquaculture, including

stage of selection of polluted water from the pool or pools with aquaculture from any horizontal level of the pool or pools,

the stage of primary mechanical purification of the selected water, carried out on a filter with lamellas of separation,

the stage of biological treatment of water, carried out on a filter with bio-loading in a pseudo-boiling layer with unidirectional movement from the bottom up of the purified water and air,

a stage of secondary fine mechanical cleaning, carried out on a filter with separation lamellas,

the stage of water disinfection by ozonation with simultaneous enrichment of water with oxygen using a gas ozone-oxygen mixture

at a pressure of 1.05-1.40 bar, followed by maintaining the treated water at atmospheric pressure and controlling the final amount of ozone,

at the same time, at each stage of cleaning, a process for removing separated mechanical impurities is provided, the water is circulated using a pump,

the cleaning equipment is connected in series with each other in accordance with the sequence of these stages and is placed on the production line to the pump,

and devices for ozonation, water enrichment with oxygen and control of the final amount of ozone are located on the pressure line of the pump,

at the same time, the equipment is installed so that the upper water level in the mechanical filters and the upper water level of the biofilter pseudo-boiling layer are carried out at the level of the pool or aquaculture pools with a vertical accuracy of -0.20 m and the pump suction level at the level of the pool or pools mirrors with aquaculture with vertical accuracy up to -0.50 m.

For an unambiguous and more complete understanding of the description of the claimed invention, the following are clarifications and disclosures of the concepts and terms used above, as well as a description of the individual stages of the method.

At the stage of primary mechanical water purification, the separation of mechanical particles is carried out - residues of feed, aquaculture vital products. As a rule, these are particles up to 50 mm in size. Separation takes place on plate or tubular separation lamellas.

At the stage of biological treatment, the decomposition of organic particles of various nature is carried out with the simultaneous degassing of the resulting nitrogen oxides and carbon dioxide. Biological treatment is carried out on the filling biological loading in a pseudo-boiling layer. This is facilitated by the distributed aeration of this layer with air while the purified water moves through the layer from the bottom up. Aeration air is supplied by a compressor. In the process of biological treatment, biomass (bacterial mass) grows and dies. The dead biomass falls from the carrier and falls down to the bottom, and then through its perforation into the settling tanks, followed by removal from the filter. However, the thinnest particles of dead biomass (bacterial sludge) and mechanical particles after the first mechanical stage are carried away by a pseudo-boiling current of water and enter the output of the biological treatment stage. In practice, these are particles up to 20 microns in size. In the presence of such particles in the treated water, its disinfection is difficult, oxygen saturation and the increase in the mass of aquaculture slows down. Therefore, water after the biological treatment step should be further purified. The flow rate of water during the passage of the biofilter is laminar in nature. The optimal water flow rate at the stage of biological treatment is selected empirically. In this case, an increase in speed above the optimum leads to the need to increase the working volume of the biofilter. Lowering the speed below the optimum leads to a decrease in the productivity of the treated water.

At the stage of secondary fine mechanical purification of water, fine mechanical particles and bacterial sludge particles are separated from water. This process is also carried out on a filter with separation lamellas, however, the size of the free gap between the opposite surfaces of the lamella (s) for primary and secondary mechanical cleaning filters is referred to as (2-4): 1. This refers to opposite surfaces of the lamella, if the lamellas are tubular or opposite surfaces of adjacent lamellas, if the lamellas are lamellar. In this case, tubular lamellas can have a cross section in the form of a polyhedron, circle, ellipse.

The given ratio of the dimensions of the free gap between the opposite surfaces of the lamella (s) for filters of primary and secondary mechanical cleaning was found empirically and depends on many factors - the type and amount of feed, cleaning performance, cleaning efficiency of the previous stages, etc. For large and lower ratios the cleaning efficiency decreases or decreases its productivity in purified water, in particular, if the distance between the walls of the lamellas is less than 10 mm, they quickly overgrow e with bacterial sludge and the ability to cleanse itself decreases, while increasing this distance over 19 mm, it is necessary to increase the total working volume of the mechanical filter.

Disinfection of purified water is carried out simultaneously with the process of enrichment (saturation) of water with oxygen using an ozone-oxygen mixture. The process is carried out by combining two technological processes: introducing the mixture during injection of a water stream and / or sparging through a layer of water and maintaining the resulting stream under a pressure of 1.05-1.40 bar. The indicated range of values is selected empirically and depends on the flow rate, the type of equipment used and the amount of residual ozone. The amount of residual ozone is controlled automatically or by sampling after the overpressure stage. Thus, in practice, a combination of disinfection and oxygen saturation of the water is obtained. As a result of this, the ozone flotation process can be eliminated, which in turn is facilitated by an increased degree of water purification at the stage of secondary fine mechanical purification. At the same time, instead of entering the atmosphere, ozone is more fully absorbed by water with the formation of oxygen, which leads to its economy. Such an effective use of ozone can reduce the amount of oxygen in the mixture, which leads to its economy. A decrease in pressure in the flow below 1.05 bar leads to insufficient oxygen saturation of the water, an increase in pressure to 1.40 bar in all cases allows achieving the necessary degree of oxygenation. An even greater efficiency of the process is maintaining the treated water at atmospheric pressure at the output of the ozonation and oxygenation process, which helps to remove the remaining traces of ozone and greater oxygen absorption. The exposure time is 20-120 s, the exposure time less than 20 s does not allow to reduce the amount of residual ozone to an acceptable level, the exposure time of 120 s already allows you to reduce the amount of residual ozone to an acceptable level.

At each stage of cleaning, it is planned to remove mechanical impurities separated on the filter, which are removed from the filters through the settling tanks located at the bottom of the filters. The equipment of the cleaning stages is sequentially interconnected in the order of the sequence of these stages and placed on the production line to the pump. Devices for ozonation, water enrichment with oxygen and control of the final amount of ozone are located on the pressure line of the pump.

An important constructive factor is the installation of cleaning equipment in such a way that the upper water level in the mechanical filters and the upper water level of the biofilter pseudo-boiling layer are carried out at the mirror level of the pool or pools with aquaculture with a vertical position accuracy of -0.20 m and the pump suction level at mirrors of a pool or pools with aquaculture with a vertical accuracy of -0.50 m. In accordance with this, the pump is located at a similar level on the pressure line but. This arrangement of equipment allows to minimize the hydraulic resistance of the entire system due to the absence of level differences between units of equipment and thereby reduce energy costs to support the circulation of water in the system when implementing the inventive method. In addition, this arrangement allows you to naturally maintain the required water level in the filters, which eliminates the need for current regulation of the working level and provides a laminar flow of water to the subsequent stages of the process. The latter reduces the amount of particles entrained by the flow to the next stage of the process and does not prevent the deposition of contaminants at the bottom of the filter. In addition, the specified alignment of equipment increases the reliability of operation and maintainability of the system, because in case of failure of the circulation system (for example, stopping the pump) does not dehydrate any equipment, including the pool or pools with avocaculture and allows for repair work. The most desirable is to build a mirror of the water surface of all units of the process equipment at one level with the level of the mirror of the pool or pools with aquaculture. However, due to various design and technological circumstances, a vertical downward shift of the equipment’s upper water level to -0.20 m and a pump suction level to -0.50 m is allowed, which does not lead to significant energy losses. In other words, for various reasons, the filters can be displaced in such a way that the upper water level in them can be below the mirror level of the pool or pools with aquaculture up to 0.20 m, and the suction level of the pump is lower to 0.50 m.

Materials for the manufacture of equipment according to the claimed method are structural steels and plastics. Housing pools and filters can be made of concrete.

The claimed invention is a technical solution, because represents a solution to the problem of achieving the claimed technical result by implementing the method, which consists in the implementation of actions on material objects using material means. In this case, the material object is water, the material means are mechanical cleaning filters with separation lamellas, a filter with bio-loading, a pump, ozonation and oxygen enrichment devices. With the help of these tools over water carry out cleaning and preparation. All actions on these material objects are performed in time and in a certain sequence.

This technical solution is industrially applicable in the field of aquaculture cultivation and is applicable as a method of purification and preparation of pool water for their maintenance. The application and use of the proposed method does not cause any difficulties and can be carried out by appropriate specialists. In the implementation of the method, devices, devices and materials manufactured by the industry and placed on open sale are used. Methods of implementing the invention are operator work with equipment, monitoring the operation of equipment, feeding aquaculture, equipment maintenance. Means of implementation are mechanical means of cleaning and maintenance, computer equipment and control devices.

The above set of essential features of the claimed invention and their disclosure allows us to conclude that the claimed technical result is achieved, namely the achievement of the following technical advantages compared to the prototype:

1. Reducing the energy costs of a full cycle of water purification and treatment in closed water supply plants for aquaculture cultivation due to the absence of level differences between units of equipment and a corresponding reduction in the system's hydraulic resistance.

In the prototype method, the energy costs per unit of production are 7-12 kW per 1 kg of aquaculture production, and in the inventive method, these costs are less and amount to 0.7-1.4 kW per 1 kg of aquaculture production.

2. Increasing the degree of purification from mechanical impurities due to the introduction of an additional stage of fine mechanical cleaning and the implementation of the laminar flow of water during the transition of water to the next stage.

In the prototype method, in the absence of a stage of secondary fine mechanical cleaning, water after bio-treatment contains from 75 to 200 g / m3 of mechanical impurities up to 20 microns in size, and in the inventive method after the stage of secondary fine mechanical cleaning of such impurities only 0.5-5 g / m3.

3. Increasing the efficiency of using oxygen and the ozone-oxygen mixture in the processes of disinfection and oxygen saturation of water occurs by combining the processes of ozonation and saturation of water with oxygen. In this case, the decaying ozone also saturates the water with oxygen and this oxygen is effectively dissolved under the overpressure of the process. The remaining traces of ozone decay or are released when the treated water is maintained at atmospheric pressure at the outlet of the stage. The efficiency of the process is also improved through the use of cleaner water after the stage of secondary fine mechanical cleaning. In the process of oxygenation in the prototype method, 60-80 g / m3 of oxygen is consumed, and in the claimed method 14-18 g / m3 of oxygen.

4. Improving the reliability of operation and maintainability of the system due to the possibility of maintaining a stationary water level in units of equipment in case of failure of the circulation system, which is ensured by placing all units of equipment at the same level.

Effective performance with such equipment placement is possible through the use of a combination of technological methods:

- laminar flow of water by gravity to all units of the treatment equipment and the simultaneous withdrawal of water at the last stage of treatment by the pump at the level of the upper drain,

- placement of pressure communications and oxygenation / ozonation equipment on the same level as the mirror of the pool or pools for aquaculture.

The essential features common with the prototype are:

- selection of contaminated water,

- carrying out mechanical treatment of selected water,

- conducting biological treatment of the selected water, carried out on a filter with bio-loading in a pseudo-boiling layer,

- stage disinfection of water by ozonation,

- stage of oxygenation.

Distinctive from the prototype, the essential features of the claimed invention are:

- primary mechanical cleaning of the selected water on a filter with lamellas of separation,

- unidirectional bottom-up movement of purified water and bubbled air, in the process of biological treatment of water carried out on a filter with bio-loading in a pseudo-boiling layer

- the implementation of the secondary fine mechanical cleaning on the filter with lamellas of separation,

- the implementation of disinfection of water by ozonation while enriching the water with oxygen when using a gas ozone-oxygen mixture at a pressure of 1.05-1.40 bar, followed by maintaining the treated water at atmospheric pressure and controlling the final amount of ozone,

- placement of equipment in such a way that the upper water level in mechanical filters and the upper water level of the biofilter pseudo-boiling layer are carried out at the level of the pool or aquaculture pools with a vertical accuracy of -0.20 m and the pump suction level at the level of the pool or pool mirrors with aquaculture with a vertical accuracy of -0.50 m.

These significant features are distinctive from the prototype, because each of them is not contained in the totality of the essential features of the prototype, i.e. not present in the list of actions carried out in the prototype and is not their characteristic.

As already shown above, these distinctive essential features from the prototype ensure the achievement of the claimed technical result when using other essential features of the invention specified in the description.

Thus, it is shown that the set of essential features of the claimed invention, which allows to achieve the claimed technical result, differs from the set of essential features of analogues, prototype, as well as other known data sources, i.e. it is not known the use of this combination of essential features with the receipt of the claimed technical result. In other words, the claimed invention is not known from the prior art.

In the course of studying the prior art, methods for purifying and preparing water in closed water supply plants for aquaculture cultivation did not reveal technical solutions, the essential features of which coincide with the distinctive essential features of the claimed invention and make it possible to achieve the claimed technical result. Thus, it is confirmed that there is no known effect of distinctive essential features of the claimed invention on the claimed technical result.

The present level of technology does not describe methods of purification and preparation of water in closed water supply plants for aquaculture cultivation, containing all of the above set of distinctive essential features, as well as individual distinctive essential features, in particular:

1. The stage of secondary fine mechanical cleaning, carried out on a filter with lamellas of separation.

There is no information in the literature that secondary mechanical cleaning when using separation lamellas with a distance between opposite surfaces 2 to 4 times smaller than the corresponding distance at the primary mechanical cleaning stage is located after the biological cleaning stage and allows you to clean the water in such a way that subsequent disinfection water, a greater reduction in the amount of residual ozone and a greater saturation of it with oxygen are possible relative to known methods.

2. The stage of water disinfection by ozonation with simultaneous enrichment of water with oxygen using a gas ozone-oxygen mixture at a pressure of 1.05-1.40 bar, followed by maintaining the treated water at atmospheric pressure and controlling the final amount of ozone.

There is no information in the literature that the combination of disinfection processes with ozonation and oxygen saturation of water with a pressure of 1.05-1.4 bar and subsequent exposure of treated water at atmospheric pressure for 20-120 s make it possible to effectively disinfect water, saturate it with oxygen and reduce the residual amount of ozone to an acceptable level in one stage of the process.

3. Placement of equipment in such a way that the upper water level in the mechanical filters and the upper water level of the biofilter pseudo-boiling layer are carried out at the mirror level of the pool or pools with aquaculture with a vertical position accuracy of -0.20 m and the pump suction level at the level of the pool mirror or pools with aquaculture with a vertical accuracy of -0.50 m. There is no information in the literature that the indicated placement of equipment can significantly reduce energy costs for the implementation of the method and purification and preparation of water in closed water supply plants for aquaculture cultivation by reducing the total hydraulic resistance of the system while naturally maintaining the upper required water level in units of equipment.

It should also be noted that the use of the entire specified set of essential features, including the set of distinctive features, to obtain the claimed technical result should not be explicitly for specialists from the prior art, because It is not a combination, modification or sharing of information contained in the prior art and / or general knowledge of a specialist.

The effectiveness of the claimed technical result is achieved in the following modifications of the method, characterizing special cases of its implementation:

1. The inventive and described above method, in which mechanical cleaning is carried out on plate or tubular lamellas.

2. The method according to p. I, in which the cross section of the tubular lamellas has one of the forms: a polyhedron, a circle, an ellipse.

3. The inventive and described above method, in which the size of the free gap between the opposite surfaces of the lamella or lamellas for filters of primary and secondary mechanical cleaning refers to (2-4): 1.

4. The inventive and described above method, in which the aging of water treated with an ozone-oxygen mixture under pressure at atmospheric pressure for 20-120 s.

The description of the claimed method is illustrated by the scheme, which shows the following notation:

1 - pool

2 - selection of contaminated water,

3 - primary mechanical water treatment,

4 - biological treatment of water,

5 - secondary fine mechanical water purification,

6 - pump

7 - ozonation and enrichment of water with oxygen,

8 - removal of mechanical impurities,

9 - compressor for supplying air to the biological treatment stage.

The claimed invention - "A method of purification and preparation of water in closed water supply systems for growing aquaculture" is carried out as follows.

From any given level of the pool (s) with aquaculture 1, contaminated water 2 is taken. The selected water flows by gravity to the primary mechanical treatment 3, where they are cleaned of mechanical impurities on the separation lamellas. In this case, both tubular and plate separation lamellas with a free clearance between opposite surfaces of the lamella (s) can be used, which is 22-50 mm. Next, the water enters the biological treatment stage 4, where it is cleaned on a bio-charge in a pseudo-boiling layer with unidirectional movement of the purified water and air from the bottom up. Air for aeration is supplied using a compressor 9. In this case, the optimal speed of water purification at this stage is determined empirically. After bioremediation, water enters the stage of secondary fine mechanical cleaning 5, carried out on a filter with separation lamellas with a free gap between the opposite surfaces of the lamella (s) 10-20 mm. Next, the water is sent by pump 6 to the stage of water disinfection by ozonation with simultaneous enrichment of water with oxygen 7. After ozonation of the water and its saturation with oxygen under pressure, the treated water is held at atmospheric pressure for 20-120 s. The water thus purified again enters the pool (s) with aquaculture. At the same time, the upper water level in mechanical filters and the upper water level of the biofilter pseudo-boiling layer were achieved at the level of the pool (s) mirror with aquaculture with a vertical position accuracy of -0.20 m and the pump suction level at the level of the pool (s) mirror with aquaculture vertical accuracy up to -0.50 m. At each stage of cleaning, a process for removing separated mechanical impurities is provided 8.

Example 1

From the pool (s) with tilapia (at a planting density of 300 kg / m3), contaminated water is taken from the bottom level and the water column. The selected water flows by gravity to the initial mechanical cleaning stage in the lower part of the mechanical filter with tubular separation lamellas with a reduced inner diameter of 50 mm (the amount of mechanical impurities reaches 750 g / m3, the dissolved oxygen content is 8-6 mg / l). Incoming water in a natural way in a laminar mode moves up in different directions of the lamellas. Having reached the upper overflow opening of the filter, water flows down and enters the lower part of the biofilter. In a biofilter, water rises from the bottom up along the bio-charge while simultaneously aerating this layer with air - this way the water is processed in a pseudo-boiling bio-loading layer. At the same time, the water purification rate is 0.001 m3 / s. After the biofilter, water in a similar way enters the fine mechanical filter with tubular separation lamellas with a given inner diameter of 19 mm (the amount of contaminants 2-5 g / m3 after the fine cleaning stage) and then is sent to the stage of water disinfection by ozonation with simultaneous enrichment using a pump water with oxygen. These processes are carried out simultaneously in a complex device under a pressure of 1.05 bar (oxygen consumption of 14-18 mg / l). The device is a container including an injector and a water lock. After this treatment, the water is kept at atmospheric pressure for 20 s and then sent to the pool (s) with fish (oxygen content in the water is 14-18 mg / l, ozone content is -0.15 mg / m3. The purification devices are located below the level of the mirror of the pool or pools with fish at 0.2 m, the pump is located below the level of the pool mirror at 0.5 m, the devices for ozonation and saturation of water with oxygen are located flush with the level of the mirror of the pool or pools. 8-0.9 kW.

Example 2

From the pool (s) with sterlet (at a density of 60 kg / m) contaminated water is taken from the bottom level. Selected water with impurities flows by gravity to the primary mechanical cleaning stage in the lower part of the mechanical filter with tubular separation lamellas with a reduced inner diameter of 32 mm (the amount of mechanical impurities reaches 180 g / m ³ , the dissolved oxygen content is at the level of 8-10 mg / l) ) Incoming water in a natural way in a laminar mode moves up in different directions of the lamellas. Having reached the upper overflow opening of the filter, water flows down and enters the lower part of the biofilter. In a biofilter, water rises from the bottom up along the bio-charge while simultaneously aerating this layer with air - this way the water is processed in a pseudo-boiling bio-loading layer. At the same time, the water purification rate is 0.025 m3 / s. After the biofilter, water similarly enters the fine mechanical filter with tubular separation lamellas with a reduced inner diameter of 10 mm (the amount of contamination is 1-3 g / m3 after the fine cleaning stage) and then is sent to the water disinfection stage by ozonation with simultaneous enrichment using a pump water with oxygen. These processes are carried out simultaneously in a complex device under a pressure of 1.40 bar (oxygen consumption 12-14 mg / l). The device is a container including an injector and a water lock. After this treatment, the water is kept under atmospheric pressure for 20 s and then sent to the pool or pools with fish (the oxygen content in the water is 12-14 mg / l, the ozone content is 0.12 mg / m3. The purification devices are located below the level of the mirror of the pool or pools with fish at 0.2 m, the pump is located below the level of the pool mirror at 0.5 m, the ozonation and oxygen saturation devices are located flush with the level of the pool mirror. 1.1 kW

The above examples should not be construed as limiting the scope of the invention. On the contrary, variations, modifications and equivalents of the described examples are also possible within the scope of the rights set forth in the claims.

The above description of the invention and examples of its implementation confirm the achievement of the claimed technical result in the process of carrying out the invention. They also show a causal relationship of essential features between themselves and the achieved technical result.

From the above description it also follows that the achievement of a technical result is possible only when implementing the entire set of essential features, which also confirms the technical solution to the problem of carrying out the invention.

Claims (13)

1. The method of purification and preparation of water in closed water supply for growing aquaculture, including stage of selection of polluted water from the pool or pools with aquaculture from any horizontal level of the pool or pools, the stage of primary mechanical purification of the selected water, carried out on a filter with lamellas of separation, the stage of biological treatment of water, carried out on a filter with bio-loading in a pseudo-boiling layer with unidirectional movement from the bottom up of the purified water and air, a stage of secondary fine mechanical cleaning, carried out on a filter with separation lamellas, the stage of disinfection of water by ozonation with simultaneous enrichment of water with oxygen using a gas ozone-oxygen mixture at a pressure of 1.05-1.40 bar, followed by maintaining the treated water at atmospheric pressure and controlling the final amount of ozone, at the same time, at each stage of cleaning, a process for removing separated mechanical impurities is provided, the water is circulated using a pump, the cleaning equipment is connected in series with each other in accordance with the sequence of these stages and is placed on the production line to the pump, and devices for ozonation, oxygen enrichment of water and control of the final amount of ozone are located on the pressure line of the pump, while the equipment is installed so that the upper water level in the mechanical filters and the upper water level of the pseudo-boiling layer of the biofilter are implemented at the mirror level of the basin or pools with aquaculture with an accuracy of location vertical up to -0.20 m and the level of suction of the pump at the mirror level of the pool or pools with aquaculture with a vertical accuracy of -0.50 m. 2. The method according to p. 1, in which mechanical cleaning is carried out on plate or tubular lamellas. 3. The method according to p. 2, in which the cross section of the tubular lamellas has one of the forms: a polyhedron, a circle, an ellipse. 4. The method according to p. 1, in which the size of the free gap between the opposite surfaces of the lamella or lamellas for filters of primary and secondary mechanical cleaning refers to (2-4): 1. 5. The method according to p. 1, which carry out the aging of water treated with an ozone-oxygen mixture under pressure at atmospheric pressure for 20-120 s.

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