WO2019160449A9

WO2019160449A9 - Method of water purification and preparation in closed water-supply units for aquaculture farming

Info

Publication number: WO2019160449A9
Application number: PCT/RU2019/000095
Authority: WO
Inventors: Ласар Руждиевич ТАУФИК
Original assignee: Taufik Lasar Ruzhdievich
Priority date: 2018-02-16
Filing date: 2019-02-15
Publication date: 2019-11-21
Also published as: WO2019160449A3; WO2019160449A2; RU2696434C1

Abstract

The invention relates to methods of water purification and preparation for aquaculture farming. The technical result of the invention is to reduce energy expenditure, raise the degree of purification, increase the usage efficiency of oxygen and an ozone-oxygen mixture and improve operating reliability. This technical effect is achieved by implementing a method of water purification and preparation in closed water-supply units for aquaculture farming, including a step of extracting contaminated water from an aquatic life-containing tank(s) from any horizontal level of the tank, a step of primary mechanical purification of the extracted water, which is carried out on a filter having separating lamellae, a step of biological water purification, which is carried out on a filter having a biological filter medium in a fluidized bed with unidirectional bottom-to-top movement of the water under purification and air, a step of secondary fine mechanical purification, which is carried out on a filter with separating lamellae, and a step of disinfecting water by means of ozonation with simultaneous enrichment of the water with oxygen using a gaseous ozone-oxygen mixture at a pressure of 1.05-1.40 bar.

Description

5 Title of invention

The method of purification and preparation of water in closed installations

water supply for aquaculture cultivation

Technical field

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

aquaculture.

State of the art

Currently, there are many ways to purify and prepare water for growing aquaculture. In most

15 cases they relate to closed water supply (UZV) installations, in which water purification and treatment processes are carried out sequentially. So there is a known method of water purification in pools for the development of living organisms, including the controlled supply of contaminated water to a sectional filter, purification in the filter sections at different 20 loads / fillers, including bio-loading, located on

single mesh bottom, as well as alternating with water inlet

adjustable sludge separation [1]. 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, providing

25 feeding, separation of solid impurities from water and their removal,

bio-purification of water, oxygenation and return to reservoirs for aquaculture, thermoregulation, while the system of reservoirs and equipment has a modular structure in which reservoirs are interconnected by pipelines [2]. The disadvantages of the above methods zo are increased energy costs of a full cycle of purification and preparation of water, insufficient degree of purification from mechanical impurities, low efficiency of the use of oxygen and ozone-oxygen mixture in the processes of disinfection and oxygen saturation 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, as well as oxygenation by passing through an oxygen cone, while pool mirror levels with

aquaculture, water withdrawal after bio-treatment, pump and oxygen generator inlet line are different [3]. 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 exit of the stage of biological treatment and denitrification;

- 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 problem to be solved and the technical result achieved The problem of the claimed invention is to reduce the energy costs of water treatment and preparation, increase the degree of water purification, increase the reliability of equipment operation and maintainability. The technical result of the invention is:

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

- to increase the degree of purification from mechanical impurities; s

- to increase the efficiency of use of oxygen and the ozone-oxygen mixture in the processes of disinfection and oxygenation of water;

- to increase 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.

Disclosure of invention

The achievement of the specified technical result in the claimed invention is achieved through the implementation of the totality

essential features in the method of purification and preparation of water in closed water supply plants 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

stage of primary mechanical treatment of selected water,

carried out on a filter with separation lamellas,

the stage of biological treatment of water, carried out on a filter with bio-loading in a fluidized (fluidized) bed at

unidirectional movement from bottom to top of the purified water and air, the stage of secondary fine mechanical cleaning, carried out on the filter with separation lamellas,

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

under pressure 1, 05-1, 40 bar, followed by aging

treated water at atmospheric pressure and control 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 by a pump, the cleaning equipment is connected in series among themselves in accordance with the sequence of these stages and 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, while the equipment is set so that the upper water level in the mechanical filters and the upper water level

the fluidized bed of the biofilter is carried out at the level of the mirror of the pool or pools with aquaculture with a vertical accuracy of -0.20 m and the suction level of the pump at the level of the mirror of the pool or pools with aquaculture with a vertical accuracy

up to -0.50 m.

For an unambiguous and more complete understanding of the description

The claimed invention further provides clarifications and disclosures of the concepts and terms used above, as well as a description of the individual steps of the method.

At the stage of primary mechanical water purification, the separation of mechanical particles is carried out - the remains of feed, products

aquaculture activities. 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 fluidized (fluidized) bed. 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 false bottom and then through its perforation into the settling tanks, followed by removal from the filter. However, the finest particles of dead biomass

(bacterial sludge) and mechanical particles after the first mechanical stage are carried away by the fluidized flow 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 most optimal biological treatment process takes place at a water purification rate at this stage, determined by the ratio of (0.1 -2.5) 1 O ⁴ * S m ³ / s, where S is the cross-sectional area of the biological treatment device (filter). This ratio is determined empirically. Given the laminar flow of water at the inlet and outlet of the biofilter. With a lower value, the ratio is unacceptably reduced

performance for purified water, with a larger significantly increases the required working volume of the biofilter. In this description, the terms "pseudo-boiling layer", "fluidized bed" and

"Fluidized bed" have the same meaning.

At the stage of secondary fine mechanical water purification

carry out the separation from water of fine mechanical particles and particles of bacterial sludge. 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. and lower values of the ratio, the cleaning efficiency decreases or its performance in purified water decreases, in particular, if the distance between the walls of the lamellas is less than 10 mm, they become rapidly overgrown with bacterial sludge and the ability to self-clean decreases, while increasing this distance over 19 mm, it is necessary to increase total working volume of a 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: the introduction of the mixture by injection of a water stream and / or bubbling through a layer of water and keeping

the resulting stream under a pressure of 1, 05-1, 40 bar. The indicated range of values is selected empirically and depends on

flow rate, type of equipment used and the amount of residual ozone. The amount of residual ozone

controlled automatically or by sampling after the stage of exposure under excessive pressure. 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. This efficient use of ozone allows

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 outlet of the ozonation and oxygenation process, which helps to remove the remaining traces of ozone and greater oxygen absorption. Duration

exposure time is 20-120 s, exposure time less than 20 s is not allows you 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

the sequence of these stages and placed on the production line to the pump. Devices for ozonation, enrichment of water

oxygen and control the final amount of ozone placed on the pressure line of the pump.

An important design factor is installation.

cleaning equipment in such a way that the upper water level in the mechanical filters and the upper water level of the fluidized bed of the biofilter are implemented at the level of the pool mirror with

aquaculture with vertical accuracy up to -0.20 m and the suction level of the pump at the level of the pool mirror with aquaculture with vertical accuracy up to -0.50 m. In accordance with this, equipment on the pressure line of the pump is located at a similar level. This arrangement of equipment allows up to

minimum to reduce 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 reliability

operation and maintainability of the system, as upon failure circulation systems (for example, stopping the pump) does not dehydrate any equipment, including the pool 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 the same level with the level of the mirror of the pool with aquaculture. However, for 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 level of the pool mirror 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 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 fluidized bed,

- 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 movement from bottom to top of purified water and

bubbling air

in the process of biological purification of water carried out on a filter with bio-loading in a fluidized bed

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

- the implementation of disinfection of water by ozonation with

simultaneous enrichment of water with oxygen when using a gas ozone-oxygen mixture

under pressure 1, 05-1, 40 bar, followed by aging

treated water at atmospheric pressure and control the final amount of ozone,

- placement of equipment in such a way that the upper water level in the mechanical filters and the upper water level of the fluidized bed of the biofilter 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 or pool mirror 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 aggregate

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 features from the prototype essential features ensure the achievement

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 study of the prior art methods of purification and preparation of water in closed water supply systems for growing aquaculture has not identified technical solutions, the essential features of which coincide with the distinctive essential features of the claimed invention and allow to achieve the claimed technical result. Thus, the lack of fame of the influence of distinctive essential features

of the claimed invention to the claimed technical result.

The current level of technology does not describe methods of purification and preparation of water in closed water supply systems 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 2-4 times smaller

the corresponding distance at the stage of primary mechanical cleaning is located after the biological treatment stage and allows you to purify the water in such a way that with subsequent disinfection of water - ^ - a greater reduction in the amount of residual ozone and its greater oxygen saturation are possible relative to known methods.

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

under pressure 1, 05-1, 40 bar, followed by aging

treated water at atmospheric pressure and control the final amount of ozone.

There is no information in the literature that the combination of disinfection processes with ozonation and saturation of water with oxygen at a pressure of 1, 05-1, 4 bar and subsequent exposure of treated water at atmospheric pressure for

20-120 s allow you 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 fluidized bed of the biofilter are carried out at the level of the pool mirror with

5 aquaculture with vertical accuracy up to

-0.20 m and the suction level of the pump at the level of the pool mirror with aquaculture with a vertical accuracy of -0.50 m.

There is no information in the literature that the indicated arrangement of equipment can significantly reduce energy costs for the implementation of the method of purification and preparation of water in plants

closed water supply for aquaculture cultivation by reducing the total hydraulic resistance of the system while naturally maintaining the upper required water level in units of equipment.

15 It should also be noted that the use of

the specified set of essential features, including

combination 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, change or

20 sharing 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:

25 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. 1, 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 opposing surfaces lamellas (lei) for filters of primary and secondary mechanical cleaning refers as (2-4): 1.

4. The inventive and described above method in which the speed

water purification at the stage of biological treatment is (0.1-

5 2.5) 10 ⁴ xS m ³ / s, where S is the cross-sectional area of the device

(filter) biological treatment.

5. 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.

10

Brief Description of the Drawings

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

1 - pool

15 3 - selection of contaminated water,

3 - primary mechanical water treatment,

4 - biological treatment of water,

5 - secondary fine mechanical water purification,

6 - pump

20 7 - ozonation and enrichment of water with oxygen,

8 - removal of mechanical impurities,

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

25 Embodiments of the invention

The claimed invention - "A method of purification and preparation of water in closed water supply systems for growing aquaculture" is carried out as follows. C From any given level of the aquaculture pool 1

contaminated water is taken 2. The selected water flows by gravity to the primary mechanical treatment 3, where carry out cleaning from mechanical impurities on the separation lamellas. In this case, tubular, lamellar lamellas of separation with sizes of a free gap between opposite surfaces of the lamella (lei) can be used as 22-50 mm. Next, the water enters the stage

biological treatment 4, where they carry out cleaning on

fluidized bed bio-loading with unidirectional bottom-up movement of treated water and air. Air for aeration is supplied using compressor 9.

optimal speed of water purification at this stage,

determined by the ratio of (0.1 -2.5) 10 ⁴ * S m ³ / s, where S is the cross-sectional area of the biological treatment device (filter). After bioremediation, water enters the stage of secondary fine mechanical cleaning 5, carried out on a filter with separation lamellas with a clearance between

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 aquaculture pool. At the same time, the upper water level in the mechanical filters and the upper water level of the fluidized bed of the biofilter are implemented at the level of the pool mirror with aquaculture with accuracy

vertical position to

-0.20 m and the suction level of the pump at the mirror level of the pool with aquaculture with a vertical accuracy of -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 density of 300 kg / m ³ ), contaminated water is taken from the bottom level and thickness water. The selected water flows by gravity to the stage of primary mechanical cleaning 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 / m ³ , the content of dissolved oxygen 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 - in this way, water is processed in the fluidized bed of the bio-charge.

At the same time, the water purification rate is 0.001 m ³ / s. After the biofilter, water similarly enters the fine mechanical filter with tubular separation lamellas with a given inner diameter of 19 mm

(the amount of contamination is 2-5 g / m ³ after the stage of fine cleaning) and then, with the help of the pump, it is sent to the stage of water disinfection by ozonation with simultaneous enrichment of 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 under atmospheric pressure for 20 s and then sent to the pool with fish (the oxygen content in the water is 14-18 mg / l, the ozone content is 0.15 mg / m ³ .

purification devices are located below the level of the pool mirror with fish at 0.2 m, the pump is located below the level of the pool mirror at 0.5 m, ozonation and oxygen saturation devices are located flush with the level of the pool mirror.

Energy costs per 1 kg of aquaculture products

are 0.8-0, 9 kW. Example 2

From the pool (s) with sterlet (at a density of 60 kg / m ³ ), contaminated water is taken from the bottom level. Selected water with impurities flows by gravity to the initial stage 5 of mechanical cleaning 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 )). The incoming water naturally in the laminar mode moves up in different directions

sections of 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 - 15, thus the water is processed in the fluidized bed of the bio-loading. At the same time, the water purification rate is 0.025 m ³ / s. After the biofilter, water in a similar way enters the fine mechanical filter with tubular separation lamellas with a reduced inner diameter of 10 to 20 mm (the amount of contamination is 1-3 g / m ³ after the fine cleaning stage

) and then with the help of the pump is sent to the stage of disinfection of water by ozonation with simultaneous enrichment of water with oxygen. These processes are carried out simultaneously in an integrated device under a pressure of 1, 40 bar (flow rate

25 oxygen 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 with fish (the oxygen content in the water is 12-14 mg / l, the ozone content is 0.12 mg / m ^3. At the same time, the cleaning devices are located below level of the pool mirror with fish at 0.2 m, the pump is located below the level of the pool mirror at 0.5 m, devices for ozonation and oxygen saturation of water are located flush with the level of the pool mirror. Energy costs per 1 kg of aquaculture products

make 1, 0-1.1 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.

Industrial applicability of the invention and the achievement of the technical result

The claimed invention is a technical solution, because represents a solution to the problem of achieving the stated

the 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,

devices for ozonation and oxygen enrichment. 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. When implementing the method, devices, devices and

materials manufactured by industry and in the open market. 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 the full cycle of purification and preparation of water 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 hydraulic resistance of the system.

In the prototype method, the energy costs per unit of production are 7-12 kW per 1 kg of aquaculture products, and in the present method, these costs are less and are 0.7-1, 4 kW per 1 kg of aquaculture products.

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 secondary thin stage

mechanical cleaning, water after biological treatment contains from 75 to 200 g / m ^{3 of} mechanical impurities up to 20 microns in size, and in the present method after the stage of secondary fine mechanical cleaning of such impurities only 0.5-5 g / m ³ .

3. Increasing the efficiency of using oxygen and the ozone-oxygen mixture in disinfection processes and oxygen saturation of water occurs by combining the processes of ozonation and oxygen saturation of water. 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 consumes 60-80 g / m ³ oxygen, and in the claimed a method of 14-18 g / m ³ 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 5 is ensured by placing all units of equipment on one

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

y cleaning equipment and simultaneous water intake at the last

stages of pump cleaning at the level of the upper drain,

- placement of pressure communications and equipment

oxygenation / ozonation at the same level as the pool mirror for aquaculture.

15 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 significant

signs between themselves and the achieved technical result.

20 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.

List of references

25 1. Application PCT WO 2005048700A2, IPC A01 K63 / 045, 11.21.2003.

Sergey Trakuks. A method of purifying water in pools for breeding living organisms and a system for its implementation.

2. US patent Ns 9497941, IPC A01 K 61/00, A01 K 63/00, A01 K 63/04, 11/22/2016. Myers, Gary. Modular aquaculture system and method of its use // Application US 20150366173 A1 12.24.2015.

3. UZV - Installations of Closed Water Supply. Technology. Site of the company "SIMEON AquaBioTechnologies" [Electronic resource]. - Access mode: http://www.simeon-aquabio.ru/base znanv / uzv sov / (accessed 02.16.2018)

SUBSTITUTE SHEET (RULE 26)

Claims

Claim

Item 1. A method of purification and preparation of water in closed water supply plants for growing aquaculture, including the stage of selection of contaminated 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 fluidized bed 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 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,

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 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 fluidized bed of the biofilter are implemented at the mirror level of the basin or pools with aquaculture with an accuracy of vertical up to -0.20 m and the level of suction of the pump at the mirror level of the pool or pools with

SUBSTITUTE SHEET (RULE 26) aquaculture with vertical accuracy

up to -0.50 m.

Item 2. The method according to claim 1, in which mechanical cleaning

carried out on plate or tubular lamellas. Clause 3. The method according to claim 2, in which the cross section of the tubular lamellas has one of the forms: a polyhedron, a circle, an ellipse.

Item 4. The method according to claim, 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 as (2-4): 1.

Paragraph 5. The method according to claim 1, in which the speed of water treatment at the stage of biological treatment is L * S (m ³ / s), where S, m ² is the cross-sectional area of the biological treatment device (filter), L, m / s - linear flow rate of water, changing in

range of values (0.1 -2.5) 10 ⁴ .

Item 6. The method according to claim 1, in which carry out aging

water treated with an ozone-oxygen mixture under pressure at atmospheric pressure for

20-120 s.

SUBSTITUTE SHEET (RULE 26)