RU208009U1 - Biofilter for water purification in fish culture systems - Google Patents

Abstract

The utility model relates to the field of fisheries and aquaculture, in particular to water purification technologies in recirculating water supply systems (RAS) for growing fish, aquatic organisms, the operation of which involves a fairly high intensity of water and gas exchange. The biofilter for water purification in fish-breeding systems contains a cylindrical body with a cone-shaped base and a sludge outlet pipe, an oxygenator located in the center of the body. The water supply to the cone-shaped oxygenator is carried out through a pressure pipeline having a branch in the middle part for additional water supply to the biofilter housing, having a bevel at the outlet at an angle of 45°. A pure oxygen inlet pipe is connected to the pressure pipeline. To supply compressed air for bubbling, a frame and a compressed air supply pipe are located in the middle part of the bioload. In the lower part of the body, on one side of the cone-shaped base, there is a sludge outlet, and on the other, a frame for collecting sediment. In addition, the outlet of purified oxygen-enriched water from the biofilter is made from the drain pipe in the upper part of the biofilter housing. EFFECT: increasing the degree of saturation of recycled water with pure oxygen and cleaning it from metabolites dissolved in it (waste products of hydrobionts and fish) while maintaining intensive water exchange.

Description

The useful model relates to the field of fisheries and aquaculture, in particular, to water purification technologies in closed water supply units (RAS) for growing fish, aquatic organisms, the operation of which assumes a sufficiently high intensity of water and gas exchange.

Known biofilter for water purification in fish breeding systems (RF patent No. 174587, IPC C02F 3/08, C02F 3/12, A01K 61/00, publ. 23.10.2017, bull. No. 30), containing a cylindrical body with a conical base and sludge removal a branch pipe, a hydraulic elevator located in the center of the body, on the upper part of which there are an annular tray and a mesh holding floating biofuel granules, and a drainage branch pipe, characterized in that it additionally contains an overflow branch pipe located above the retaining mesh, a main chamber with granules, regenerating unorganized biofuel with neutral buoyancy, a separating chamber located in the lower part of the body, the base of which is the bottom of the body and is an inverted cone with a sludge discharge pipe located at the top for periodic removal of falling sediment, and the upper part of the separating chamber is made in the form of a cone rigidly fastened to its lower part, and has slots located in a circle at the minimum allowable design distance in relation to the walls of the housing, the upper cone of the separation chamber is the bottom of the main chamber and has a slope to the walls of the housing of 30 °, while the upper part of the cover of the separation chamber is rigidly connected to the hydraulic elevator, which extends beyond the housing cover by 1/3 of the total length of the hydraulic elevator, in its upper part there is a water supply pipe, the diameter of which is half the diameter of the hydraulic elevator. The total area of the slots in the upper part of the separation chamber is equal to the area of the outlet of the hydraulic elevator. Biofuel pellets occupy 70% of the main chamber volume.

The disadvantages of this biofilter include the low efficiency of the polluted water purification process and the low oxygen content in the purified water.

The technical task of the utility model is to increase the saturation degree of circulating water with pure oxygen and purify it from metabolites dissolved in it (waste products of aquatic organisms and fish), while maintaining intensive water exchange.

The technical result is achieved in a biofilter by the fact that the contaminated water coming under pressure from the system of a closed water supply device is saturated with pure oxygen. Such water creates a "torispherical centrifugal flow", this flow is amplified by compressed air when it passes through the biofuel.

The figure shows the design of the proposed biofilter.

A biofilter for water purification in fish breeding systems contains a cylindrical body 1 with a conical base 8 and a sludge outlet 10, an oxygenator 6 located in the center of the body 1. Water is supplied to the oxygenator 6, made conical, through a pressure pipeline 5, which has a branch in the middle part for additional water supply to the biofilter body 1 and having a bevel at the outlet at an angle of 45 °, in addition, a pure oxygen inlet 7 is connected to the pressure pipeline 5, and a frame 3 and a compressed air supply are located to supply compressed air for bubbling in the middle part of the biofilter 2 4, in the lower part of the housing, on one side of the conical base 8, there is a sludge outlet 10, and on the other, a frame for collecting sediment 9, in addition, the outlet of purified oxygen-enriched water from the biofilter is made from the drainage pipe 11 in the upper part of the biofilter housing.

The biofilter works as follows.

In the system of a closed water supply device, the circulating pumps 12 take water from the pool-adder 13 and supply it to the oxygenator 6 through the pressure line 5. Additional water supply along the branch of the pressure line 5, which has a bevel at the outlet at an angle of 45 °, promotes greater water circulation inside the housing ... In parallel, oxygen purified to 93% is supplied to the oxygenator 6 under pressure through the branch pipe 7. Oxygen is actively dissolved in water up to a saturation level of 250-300%. Water saturated with oxygen collides with the cone-shaped base 8, which serves as a flow divider cone, and changes its direction of movement to the opposite, thus creating an ascending "torospherical centrifugal flow". In parallel, compressed air is supplied to the air supply frame 3 for bubbling bioreloading 2, which enhances the "torispherical centrifugal flow" of water. The supplied compressed air "removes" carbon dioxide from the water. Biological water purification is carried out with the help of bacteria on the biofuel granules. In the lower part of the housing 1, sediment falls onto the collection frame 9 and is disposed of through the sludge outlet 10. The water purified from metabolites and also enriched with oxygen is fed back to the closed water supply system through the drainage pipe 11.

Controlling the supply of pure oxygen in the biofilter makes the process of saturating water with oxygen controllable. The created "torospherical centrifugal flow" and its passage through the biofuel increases the quality of biological water purification. The biofilter design is compact with minimal operating costs.

Claims (1)

Biofilter for water purification in fish breeding systems, containing a cylindrical body with a conical base and a sludge outlet pipe, an oxygenator located in the center of the body, characterized in that the water supply to the oxygenator, made conical, is carried out through a pressure pipeline having a branch in the middle part for additional supply water into the biofilter housing and having a bevel at the outlet at an angle of 45 °, in addition, a pure oxygen supply pipe is connected to the pressure pipeline, and a frame and a compressed air supply pipe are located in the middle part of the biofuel to supply compressed air for bubbling. On one side of the cone-shaped base there is a sludge discharge pipe, and on the other - a frame for collecting sediment, in addition, the outlet of purified oxygen-enriched water from the biofilter is made from the drainage pipe in the upper part of the biofilter body.

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