RU2819703C1 - Method for disinfection of circulating water in closed water supply installations - Google Patents

Abstract

FIELD: animal breeding.

SUBSTANCE: invention relates to aquatic animals breeding. Method consists in drainage of circulating water from pools with aquaculture into discharge pipeline, movement of circulating water from pools into mechanical filter, movement of circulating water from the mechanical filter to the biological filter, movement of circulating water from the biological filter to the summation pool where the circulating water is mixed with make-up water. Replaced circulating water is discharged through the overflow pipeline. Further, water from the summation poo is fed into an oxygenator by means of a pump, and water which has passed through the oxygenator is supplied to the pool via a supply pipeline. From the summation pool, circulating water is additionally supplied to the device for mixing ozone-oxygen mixture with water, in which circulating water is saturated with ozone-oxygen mixture with ozone content from 4 to 5 mg/l. After that, circulating water saturated with ozone-oxygen mixture is supplied to the discharge pipeline through the circulating water discharge point located at the point of discharge of contaminated water from the first basin. Amount of water supplied from the device for mixing the ozone-oxygen mixture with water to the discharge point ranges from 10 to 15 % from the total volume of recycled water in the closed water supply device.

EFFECT: higher quality of disinfection of circulating water in closed water supply plants, as well as reduced duration of treatment of circulating water.

1 cl, 1 dwg

Description

The invention relates to the field of breeding aquatic animals.

There is a known method for the factory cultivation of sea cucumber fry, which involves catching spawners from the sea, placing them in a pool for spawners with sea water, adapting to the conditions of detention, stimulating the maturation of reproductive products and spawning of spawners by changing the temperature regime, spawning and incubating eggs, raising larvae to the settling stage , growing juveniles to a viable stage on substrates in a pool with running water supply, feeding and dispersing them to selected areas in the sea, characterized in that spawners with a total weight of at least 200 g are caught once a season in the early stages of gametogenesis, stimulation of maturation sexual products and spawning of spawners are carried out at least four times per season by additionally introducing sperm from the gonads of 2-5 males into the water; larvae are reared to the settling stage in nursery pools with a flow-through water supply, with a flow rate of 0.7-2.0 volume /day, while feeding the larvae is carried out, depending on the stage of their development, with a multicomponent feed containing live free-living marine diatom microalgae, and the larvae at the early auricular stage are fed with microalgae: Isochrysis galbana, Chaetoceros mulleri in a ratio of 1:1 and a concentration of 40-60 thousand. cells/ml, and at the stages of auricularia, late auricularia, doliolaria - Dunaliella salina, Phalodactylum tricornutum, Chaetoceros mulleri in a ratio of 4:2:1 and a concentration of 50-100 thousand cells/ml, adding food to the water at least once per day, juveniles are grown to 1.5-2.0 cm for 2-3 months in pools for growing sea cucumber juveniles with a water flow rate of 3-6 volumes/day, feeding of juveniles is carried out in stages: during the first three weeks after settling on substrate with benthic diatoms, and then additional food containing dusty macroalgae, and adaptation and stimulation of producers and rearing of sea cucumber fry is carried out in sea water with a filtration degree of 150-200 microns, and spawning, incubation of eggs and rearing of sea cucumber larvae is carried out in sea water with a degree of filtration cleaning 20-40 microns twice treated with UV rays and ozone, before the resettlement of juvenile sea cucumbers to selected areas in the sea, they are additionally grown to 3-4 cm either in nursery pools or in cages at sea for 5-6 months [RU 2284105 C2 , publ. September 27, 2006].

The disadvantage of this analogue is the low degree of purification of recycled water due to the low ozone content, due to the ozonization procedure of recycled water immediately before supply to the pools.

Also known is a closed water supply installation for growing fish, which is a pool containing a pre-sale preparation area, connected with a flow creation area, including an airlift; a flow creation area is connected with a breeding sector, including fish breeding channels, which are compartments separated from each other by concrete partitions, whose height is above the water level, the dilution sector is connected to the fecal matter separation sector, which is a container with V- or W-shaped traps and at least one valve for draining fecal matter into the sewer pipes, the separation sector is connected to the biofilter, which is an aeration unit with a movable bioload, including a floating load with a bacterial film and at least one diffuser, a mechanical cleaning sector is installed behind the biofilter, which is a container with at least one diffuser and a fixed load, communicating with a return channel configured to drain water to the creation area flow, the return channel includes at least one diffuser and at least one ozone lamp [RU 2798282 C1, publ. 06/21/2023].

The disadvantage of this analogue is the insufficient degree of purification of recycled water, due to the low ozone content, due to the ozonization procedure of recycled water immediately before supply to the pools.

The closest technical solution is described in a method for purifying and preparing water in closed water supply installations for growing aquaculture, including the stage of selecting contaminated water from a 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 separation, the stage of biological water purification, carried out on a filter with bioloading in a pseudo-boiling bed with unidirectional movement from bottom to top of the purified water and air, the stage of secondary fine mechanical purification, carried out on a filter with separation lamellas, the stage of water disinfection by ozonation with the simultaneous enrichment of water with oxygen when used gas ozone-oxygen mixture under a pressure of 1.05-1.40 bar, followed by keeping the treated water at atmospheric pressure and controlling the final amount of ozone, while at each stage of purification a process is provided for removing separated mechanical impurities, water circulation is carried out using a pump, equipment purification is sequentially connected to each other in accordance with the sequence of the indicated stages and placed on the process line upstream of the pump, and ozonation devices, enrichment of water with oxygen and control of the final amount of ozone are placed on the pump pressure line, at the same time the equipment is installed so that the upper level of water in mechanical filters and The upper water level of the pseudo-boiling layer of the biofilter is carried out at the level of the mirror of the pool or aquaculture pools with a vertical position accuracy of up to -0.20 m and the suction level of the pump is at the level of the mirror of the pool or aquaculture pools with a vertical position accuracy of up to -0.50 m [ RU 2696434 C1, publ. 08/01/2019].

The disadvantage of the closest technical solution is the long technological process associated with keeping ozone-treated water.

The technical problem solved by the claimed invention is the elimination of the disadvantages of analogues.

The objective of the invention is to improve the quality of disinfection of circulating water in closed water supply installations, as well as to reduce the duration of purification of circulating water.

The technical result of the claimed invention is to improve the quality of disinfection of recycled water in closed water supply installations, as well as to reduce the duration of purification of recycled water.

The specified technical result is achieved by the fact that the method for disinfecting recycled water in closed water supply installations, including draining recycled water from aquaculture pools into an outlet pipeline, moving recycled water from pools to a mechanical filter, moving recycled water from a mechanical filter to a biological filter, moving recycled water water from the biological filter into the adder pool, in which the return water is mixed with make-up water and the replaced return water is discharged through the overflow pipeline, then the water from the adder pool is supplied to the oxygenator using a pump, passing through which the water is supplied to the pool through the supply pipeline, in which recycled water from the summator pool is additionally supplied to a device for mixing the ozone-oxygen mixture with water, in which the recycled water is saturated with an ozone-oxygen mixture with an ozone content of 4 mg/l to 5 mg/l, after which the recycled water saturated with ozone is oxygen mixture is supplied to the outlet pipeline through the discharge point of recycled water, located at the point of discharge of contaminated water from the first pool, and the amount of water supplied from the device for mixing the ozone-oxygen mixture with water to the discharge point is from 10% to 15% of the total volume of circulating water water in a closed water supply device.

The proposed invention is illustrated by the figure.

In fig. Figure 1 shows a diagram of a closed water supply installation;

The figure shows: 1 - swimming pool, 2 - outlet pipeline, 3 - mechanical filter, 4 - drain pipe, 5 - biological filter, 6 - summator pool, 7 - overflow pipeline, 8 - device for mixing the ozone-oxygen mixture with water, 9 - discharge point, 10 - pump, 11 - oxygenator, 12 - supply pipeline.

According to the invention, in a method for disinfecting circulating water in closed water supply (RAS) installations, contaminated water from aquaculture pools 1 is directed through an outlet pipeline 2 into a mechanical filter 3. Mechanical filter 3 is necessary to purify circulating water from suspended particles formed during the life of fish, such as feces, feed residues and other large suspended matter, discharging them into sediment through drain pipe 4.

After passing through the mechanical filter 3, the recycled water is supplied to the biological filter 5. The biological filter 5 is necessary to purify the circulating water from dissolved impurities, such as ammonium, which is released by fish. A high concentration of ammonium is toxic to the fish itself and cannot be retained by a mechanical filter 3. In a biological filter 5, the ammonium contained in the circulating water is processed first into nitrites, then into nitrates. Thus, water with a high ammonium content passing through the biological filter 5 comes out with a low content, with a correctly calculated volume of bioload, with a content of dissolved ammonium and nitrites close to zero, and the content of nitrates, which are not so toxic to fish and do not have a negative effect on Fish growth is regulated by adding feed water.

After passing through the biological filter 5, the recycled water is supplied to the adding pool 6. The adding pool 6 is necessary for mixing purified recycled water with clean make-up water added to the adding pool 6. The replaced recycled water is discharged through the overflow pipeline 7. The volume of replaced recycled water constitutes from 5% to 15% of the total volume of circulating water in the RAS. This volume range has been determined experimentally and is considered sufficient to maintain the volume of nitrates at an acceptable level.

From the adding pool 6, water is partially supplied to the device for mixing the ozone-oxygen mixture with water 8. The device for mixing the ozone-oxygen mixture with water 8 in the RAS consists of a pump that takes water from the adding pool 6 to supply it to the oxygenator, in which water is saturated with an ozone-oxygen mixture with a high level of saturation from 4 mg/l to 5 mg/l, which is approximately 3 times higher than the standard ozone content in water (1.5 mg/l). This concentration of ozone provides effective disinfection, clarification, floagulation, and also reduces the level of nitrates in circulating water. When the ozone concentration in the water coming from the ozone-oxygen mixture mixing device is less than 4 mg/l, a sufficient effect is not achieved when disinfecting circulating water when supplied to discharge point 9. The ozone concentration in the water coming from the ozone mixing device is oxygen mixture, more than 5 mg/l is impractical due to the fact that at a concentration of 4 mg/l to 5 mg/l it ensures a sufficient level of quality of circulating water in the RAS due to effective disinfection and reduction of nitrate levels.

From the device for mixing the ozone-oxygen mixture with water 8, recycled water is supplied to the outlet pipeline 2 through the discharge point 9 of waste contaminated water from the first pool 1. Adding water saturated with the ozone-oxygen mixture through a point located at the maximum distance from the point of water intake into the pools allows ozone to decompose as the circulating water moves, oxidizing organic matter, until the circulating water enters the pools with fish. Also, the supply of water to the discharge point 9 located at the maximum distance from the place of water intake into the pools 1 allows you to exclude from the process of filtering circulating water the holding procedure to reduce the ozone concentration before supplying water to the pools 1 due to the fact that in the process of passing through all stages of purification , the ozone concentration is reduced to levels that are harmless to farmed fish, which significantly reduces the duration of purification of recycled water. Also, supplying water saturated with ozone to the discharge point 9 allows deodorization, clarification, denitrification of recycled water at the earliest stages; also, when supplying water saturated with ozone into contaminated water, the effect of flocculation of small particles occurs, in which small particles in suspension form more large flocculent accumulations (floccules), the size of which makes it possible to filter water from these accumulations, thereby improving the quality of filtration and disinfection of recycled water in the RAS, as well as reducing the duration of purification of circulating water due to the absence of the need for long-term storage of ozone-treated water.

The amount of water supplied from the ozone supply device 8 to the discharge point 9 ranges from 10% to 15% of the total volume of recycled water in the recirculation system. The volume of water supply from the device for supplying ozone 8 to the discharge point 9 is determined experimentally and is considered the most effective, so if you reduce the rate of supplied water below 10%, then the concentration of ozone in the circulating water of the RAS will be insufficient to ensure the required rate of disinfection and cleaning. Increasing the rate of supplied water above 15% is not practical, since the rate of supplied water in the range from 10% to 15% ensures the required level of disinfection of the RAS return water.

Water is taken from the summation pool 6 using a pump 10, supplied to the oxygenator 11, where the circulating water is saturated with oxygen, after which the circulating water is supplied to the pool 1 through the supply pipeline 12.

Thus, the use in RAS of a device for mixing an ozone-oxygen mixture with recycled water 8, in which the recycled water is saturated with an ozone-oxygen mixture with an ozone content of 4 mg/l to 5 mg/l, after which the recycled water saturated with the ozone-oxygen mixture is supplied to the outlet pipeline 2 through the return water discharge point 9, located at the point of discharge of contaminated water from the first pool 1, where the amount of water supplied from the device for mixing the ozone-oxygen mixture with water 8 to the discharge point is from 10% to 15% of the total volume of recycled water in a closed water supply device allows you to improve the quality of disinfection of recycled water in closed water supply installations, as well as reduce the duration of circulating water purification.

Implementation examples

First implementation example

Contaminated water from pools 1 is fed through the outlet pipeline into a mechanical filter 3, which circulates water from large wastes, discharging them into sediment through the drain pipe 4. From the mechanical filter 3, water is supplied to the biological filter 5. From the biological filter 5, recycled water is supplied to adder pool 6. The adder pool 6 is fed with clean running water with the simultaneous discharge of replaced recycled water through the overflow pipeline 7, and the volume of make-up water and the volume of replaced water are equal and constitute 5% of the total volume of recycled water in the RAS. From the summation pool 6, water is partially supplied to the device for mixing the ozone-oxygen mixture with water 8, in which the water is saturated with the ozone-oxygen mixture with a saturation level of 4 mg/l. From the device for mixing the ozone-oxygen mixture with water 8, recycled water in a volume of 10% of the total volume of recycled water in the RAS is supplied to the outlet pipeline 2 through the discharge point 9 of waste contaminated water from the first pool 1, where it is mixed with contaminated water leaving the first pool 1. Water is taken from the summation pool 6 using pump 10, supplied to oxygenator 11, after which return water is supplied to pool 1 through supply pipeline 12.

Second implementation example

Contaminated water from pools 1 is fed through the outlet pipeline into a mechanical filter 3, which circulates water from large wastes, discharging them into sediment through the drain pipe 4. From the mechanical filter 3, water is supplied to the biological filter 5. From the biological filter 5, recycled water is supplied to adder pool 6. The adder pool 6 is fed with clean running water with the simultaneous discharge of replaced recycled water through the overflow pipeline 7, and the volume of make-up water and the volume of replaced water are equal and constitute 10% of the total volume of recycled water in the RAS. From the summation pool 6, water is partially supplied to the device for mixing the ozone-oxygen mixture with water 8, in which the water is saturated with the ozone-oxygen mixture with a saturation level of 4.5 mg/l. From the device for mixing the ozone-oxygen mixture with water 8, recycled water in a volume of 13% of the total volume of recycled water in the RAS is supplied to the outlet pipeline 2 through the discharge point 9 of waste contaminated water from the first pool 1, where it is mixed with contaminated water leaving the first pool 1. Water is taken from the summation pool 6 using pump 10, supplied to oxygenator 11, after which return water is supplied to pool 1 through supply pipeline 12.

Third implementation example.

Contaminated water from pools 1 is fed through the outlet pipeline into a mechanical filter 3, which circulates water from large wastes, discharging them into sediment through the drain pipe 4. From the mechanical filter 3, water is supplied to the biological filter 5. From the biological filter 5, recycled water is supplied to adder pool 6. The adder pool 6 is recharged with clean running water with the simultaneous discharge of replaced recycled water through the overflow pipeline 7, and the volume of make-up water and the volume of replaced water are equal and constitute 15% of the total volume of recycled water in the RAS. From the summation pool 6, water is partially supplied to the device for mixing the ozone-oxygen mixture with water 8, in which the water is saturated with the ozone-oxygen mixture with a saturation level of 5 mg/l. From the device for mixing the ozone-oxygen mixture with water 8, recycled water in a volume of 15% of the total volume of recycled water in the RAS is supplied to the outlet pipeline 2 through the discharge point 9 of waste contaminated water from the first pool 1, where it is mixed with contaminated water leaving the first pool 1. Water is taken from the summation pool 6 using pump 10, supplied to oxygenator 11, after which return water is supplied to pool 1 through supply pipeline 12.

Thus, the claimed invention, due to the technologies used in it, the totality of their characteristics and interrelations, has a positive effect on the process of filtration of recycled water in a closed water supply installation and improves the quality of disinfection of recycled water in closed water supply installations, as well as reducing the duration of purification of circulating water.

Claims (1)

A method for disinfecting recycled water in closed water supply installations, including draining recycled water from aquaculture pools into an outlet pipeline, moving recycled water from pools into a mechanical filter, moving recycled water from a mechanical filter into a biological filter, moving recycled water from a biological filter into a summator pool , in which circulating water is mixed with make-up water and the replaced recycled water is discharged through an overflow pipeline, then water from the summation pool is supplied to the oxygenator using a pump, the water passed through which is supplied to the pool through a supply pipeline, characterized in that from the pool - adder, recycled water is additionally fed into a device for mixing the ozone-oxygen mixture with water, in which the recycled water is saturated with an ozone-oxygen mixture with an ozone content of 4 to 5 mg/l, after which the recycled water saturated with the ozone-oxygen mixture is fed into the outlet pipeline through the discharge point of recycled water located at the point of discharge of contaminated water from the first pool, and the amount of water supplied from the device for mixing the ozone-oxygen mixture with water to the discharge point is from 10 to 15% of the total volume of recycled water in the closed water supply device.