CN218778802U

CN218778802U - Internal circulation system for tail water of aquaculture

Info

Publication number: CN218778802U
Application number: CN202222915096.7U
Authority: CN
Inventors: 高东东; 高悠娴; 李金星; 肖杰; 张珅; 王春; 杨长军; 苏蓉
Original assignee: SICHUAN ACADEMY OF ENVIRONMENTAL SCIENCES
Current assignee: SICHUAN ACADEMY OF ENVIRONMENTAL SCIENCES
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-03-31
Anticipated expiration: 2032-11-02

Abstract

The utility model relates to an internal circulation system of tail water of aquaculture, which comprises a water inlet pipe, a treatment mechanism, an aeration mechanism and a water outlet pipe; the treatment mechanism comprises an outer shell, an inner barrel is arranged in the outer shell, an aerobic cavity is arranged in the inner barrel, the outer shell and the inner barrel are divided into an anoxic cavity and an anaerobic cavity by a separation barrel, the upper end of the aerobic cavity is communicated with the upper end of the anoxic cavity, and the lower end of the anoxic cavity is communicated with the lower end of the anaerobic cavity; the aeration mechanism comprises a water outlet disc, a reservoir is arranged below the water outlet disc, and a water drop aeration interval is arranged between the water outlet disc and the reservoir; the water inlet pipe is provided with a water inlet pump and is connected with the lower end of the aerobic cavity, the upper end of the anaerobic cavity is connected with the water outlet tray, the upper end of the anaerobic cavity is connected with the water inlet pipe through a return pipe, and the return pipe is provided with a return pump; the water outlet pipe is connected with the water reservoir. The utility model discloses area is little, and the running cost is low, can realize the cyclic utilization of aquaculture water.

Description

Internal circulation system for tail water of aquaculture

Technical Field

The utility model belongs to the technical field of the water treatment, especially, aquaculture tail water internal circulation system.

Background

In the industrial aquaculture process, the fed feed can generate residual feed, excrement, metabolites and the like after being ingested, absorbed and utilized by the aquaculture animals, and in the degradation process of the substances, the concentration of organic matters in the aquaculture water is increased, the total amount of nitrogen and phosphorus is correspondingly increased, and certain adverse effects can be generated no matter the feed is used for circulating water aquaculture or is discharged outside. In the culture process, due to continuous aeration and oxygenation, pollutants in effluent mainly comprise COD (chemical oxygen demand) and nitrate nitrogen, TN (total nitrogen) removal in the traditional aquaculture tail water treatment process mainly comprises ecological treatment, but for industrial culture with small floor area and high culture density, the cycle water period is short, and the ecological treatment efficiency cannot meet the treatment requirement.

The utility model with the application number of 201710927596.3 discloses an aquaculture sewage treatment method and an aquaculture sewage comprehensive treatment system, and the problem of large occupied area is also caused by the adoption of pool bodies such as a sewage collection pool, a bioreactor, an aeration adjusting pool and a coagulating sedimentation pool.

The utility model with the application number of 201711405023.0 discloses an aquatic product processing sewage treatment system, which comprises a sewage collecting tank and a sewage treatment station; the sewage treatment station comprises an anaerobic tank, an aerobic tank and a sedimentation and filtration tank which are sequentially communicated, and the sewage collection tank is communicated with the anaerobic tank through a sewage adding pump and a pipeline; anaerobic bacteria for decomposing organic matters are cultured in the anaerobic tank, and the aerobic tank is communicated with an aeration device for dissolving oxygen into the tank; the upper end of the sedimentation filter tank is communicated with a discharge pipe; the sewage collecting tank is connected with a sewage source and is provided with a slag extractor, the slag extractor comprises a chain plate and a power assembly for driving the chain plate to rotate, and the chain plate is used for receiving the slag in the sewage source and driving the slag to be discharged. This processing system also has a problem of large footprint.

In addition, aquatic products tail water is through handling the back, can let in the pond once more to realize cyclic utilization, the water economy resource when letting in the pond, needs carry out aeration oxygenation to the tail water, makes the oxygen content in the tail water satisfy the requirement of intaking, and traditional aeration oxygenation mode adopts aeration equipment to aerate for setting up the aeration tank, and the running cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that an aquaculture tail water internal circulation system is provided, when guaranteeing quality of water purifying effect, reduce area, reduce running cost to realize tail water cyclic utilization, the water economy resource.

In order to solve the above problem, the utility model adopts the technical scheme that: the aquaculture tail water internal circulation system comprises a water inlet pipe, a treatment mechanism, an aeration mechanism and a water outlet pipe;

the treatment mechanism comprises an outer shell, an inner barrel is arranged in the outer shell, an aerobic cavity is arranged in the inner barrel, a cavity between the outer shell and the inner barrel is divided into an anoxic cavity and an anaerobic cavity by a separation barrel, the upper end of the aerobic cavity is communicated with the upper end of the anoxic cavity, and the lower end of the anoxic cavity is communicated with the lower end of the anaerobic cavity;

the aeration mechanism comprises a water outlet disc, a reservoir is arranged below the water outlet disc, and a water drop aeration interval is arranged between the water outlet disc and the reservoir;

the water inlet pipe is provided with a water inlet pump and is connected with the lower end of the aerobic cavity, and the upper end of the anaerobic cavity is connected with the water outlet tray; the water outlet pipe is connected with the reservoir.

Further, an ultraviolet disinfection device is arranged on the water outlet pipe.

Furthermore, the bottom plate of the water outlet tray is provided with a plurality of uniformly distributed water falling holes.

Furthermore, the adding amount of the hollow microsphere suspended filler is 20-30% of the effective volume of the aerobic cavity.

Furthermore, the adding amount of the active carbon filler is 40-60% of the effective volume of the anoxic cavity and the anaerobic cavity.

The utility model has the advantages that: 1. the utility model discloses the good oxygen chamber of processing mechanism, oxygen deficiency chamber and anaerobism chamber integration are inside the shell body, and area is very little, the intensive aquaculture of specially adapted mill. And the flow path of the tail water is snakelike, so that the tail water can stay in the treatment mechanism for a long enough time, and the treatment effect is ensured.

2. Aiming at the characteristics that the oxygen content of the tail water of aquaculture is rich and pollutants mainly comprise COD (chemical oxygen demand) and nitrate nitrogen, the tail water sequentially passes through an aerobic cavity, an anoxic cavity and an anaerobic cavity, the oxygen content is gradually reduced, in the aerobic cavity, part of organic matters are decomposed by aerobic microorganisms, denitrification reaction is mainly carried out in the anoxic and anaerobic environments, nitrogen and COD (chemical oxygen demand) in the sewage are removed, and the content of the pollutants in the tail water is reduced to meet the requirement of reutilization.

3. The hollow microsphere suspended filler is anoxic, so that the growth of denitrifying bacteria is facilitated, the effect of subsequent denitrification reaction is ensured, and meanwhile, the biomass attached to the activated carbon filler is large, so that the removal efficiency of total nitrogen is enhanced.

4. Oxygenation is performed by falling water from a certain height, conventional aeration equipment is not needed, energy consumption is saved, and meanwhile, the oxygen concentration in tail water meets the aquaculture water inlet requirement, so that cyclic utilization is realized.

Drawings

FIG. 1 is a schematic view of the present invention;

reference numerals are as follows: 1, water inlet pipe; 2-water outlet pipe; 3-an outer shell; 4, an inner cylinder body; 5, an isolation cylinder; 6, an aerobic cavity; 7-anoxic cavity; 8, an anaerobic cavity; 9-hollow microsphere suspension filler; 10-activated carbon filler; 11-water outlet tray; 12-a water reservoir; 13-ultraviolet disinfection device; 14-a water inlet pump; 15-a return pipe; 16-reflux pump.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

The utility model discloses an aquaculture tail water internal circulation system, as shown in figure 1, includes inlet tube 1, processing mechanism, aeration mechanism and outlet pipe 2.

The inlet tube 1 is used for leading the aquaculture's tail water into processing mechanism, is provided with intake pump 14 on the inlet tube 1, and intake pump 14 provides into water power, and the drive tail water flows in processing mechanism.

Processing mechanism is used for getting rid of the pollutant in the tail water, specifically includes shell body 3, and shell body 3 is inside to be provided with interior barrel 4, and interior barrel 4 is inside to be provided with good oxygen chamber 6, and inlet tube 1 links to each other with the lower extreme in good oxygen chamber 6, and the cavity between shell body 3 and the interior barrel 4 is separated for oxygen deficiency chamber 7 and anaerobism chamber 8 by isolation cylinder 5, and the upper end in good oxygen chamber 6 communicates with the upper end in oxygen deficiency chamber 7, and the lower extreme in oxygen deficiency chamber 7 communicates with the lower extreme in anaerobism chamber 8.

The shell body 3 can be a circular shell body and can be a square shell body, the inner cavity of the shell body 3 is divided into an aerobic cavity 6, an anoxic cavity 7 and an anaerobic cavity 8 which are sequentially communicated from inside to outside by an inner cylinder body 4 and a separation cylinder 5, and the aerobic cavity 6, the anoxic cavity 7 and the anaerobic cavity 8 are all used for decomposing pollutants in tail water through microorganisms. The utility model discloses a shell body 3 area is little, saves space, the processing of the intensive aquaculture tail water of specially adapted mill.

The traditional sewage is low in oxygen content, so that the treatment process is anaerobic treatment-anoxic treatment-aerobic treatment, aerobic treatment equipment needs aeration for oxygenation, and meanwhile, digestion liquid flows back to the anaerobic treatment equipment to remove total nitrogen. The utility model discloses in, because the aquaculture in-process needs last aeration oxygenation, the aquatic has abundant oxygen, is favorable to the growth of aerobic microorganism, is unfavorable for anaerobic microorganism's growth, and aerobic microorganism can carry out nitration, decomposes nitrogen into nitrate nitrogen, consequently, the oxygen content height in the aquaculture tail aquatic, and the pollutant mainly is nitrate nitrogen that aerobic microorganism can not decompose, exists COD etc. simultaneously. According to the characteristics of tail water, the utility model adopts an aerobic cavity 6, an anoxic cavity 7 and an anaerobic cavity 8 which are communicated in sequence to treat the tail water. There is aerobic microorganism in the good oxygen chamber 6 for decompose COD etc. simultaneously, the oxygen in the in-process consumption aquatic of aerobic microorganism degradation COD for the oxygen concentration in the tail water reduces gradually, reaches oxygen deficiency, anaerobic state gradually, so that subsequent oxygen deficiency and anaerobic treatment. In order to improve the film forming effect, corresponding microbial agents can be put into the aerobic cavity 6, the anoxic cavity 7 and the anaerobic cavity 8 to promote the growth and the propagation of microorganisms.

The aerobic cavity 6 is internally provided with hollow microsphere suspended filler 9, the adding amount of the hollow microsphere suspended filler 9 is 20-30% of the effective volume of the aerobic cavity 6, and the effective volume is the volume of tail water in the aerobic cavity 6 in the operation process. Aerobic microorganisms are attached to the surfaces of the hollow microspheres, but the interiors of the hollow microspheres are in an anoxic environment, so that growth and propagation of denitrifying bacteria are facilitated, a part of denitrifying flora can be enriched, and a part of TN can be removed.

Active carbon fillers 10 are arranged in the anoxic cavity 7 and the anaerobic cavity 8, and the adding amount of the active carbon fillers 10 is 40-60% of the effective volume of the anoxic cavity 7 and the anaerobic cavity 8. The activated carbon filler 10 has strong adsorption capacity, can be used for a large number of microorganisms to grow, and improves the density of the microorganisms, so that most of TN and organic matters can be removed by the anoxic cavity 7 and the anaerobic cavity 8, and SS can be adsorbed.

The oxygen content of the treated water is very low, and the requirement of the oxygen content of the aquaculture inlet water is not met, so the water can be introduced into the aquaculture container again for recycling after oxygen increasing. The conventional oxygenation mode is to oxygenate oxygen into water by adopting aeration equipment, and the aeration equipment consumes electricity and has high energy consumption when in operation. The utility model discloses a reduce the energy consumption, the aeration mechanism of adoption includes out basin 11, and the below of going out basin 11 is provided with cistern 12, is provided with drop aeration interval between play basin 11 and the cistern 12. The upper end of the anaerobic cavity 8 is connected with the water outlet tray 11, the treated tail water enters the water outlet tray 11 and then falls into the reservoir 12 from the water outlet tray 11, in the falling process, the water can be fully contacted with the air, so that the oxygen in the air enters the water, and when the water falls onto the water surface of the reservoir 12, impact and sputtering are generated, and the oxygen is further contacted and mixed with the air, so that the oxygen content is improved. The drop aeration oxygenation mode does not need power equipment, does not consume electric energy, and has low operation cost. In order to improve the effect of falling and oxygen increasing, the bottom plate of the water outlet tray 11 is provided with a plurality of water falling holes which are uniformly distributed, tail water falls downwards from each water falling hole, the contact area between the tail water and air is increased, and therefore the oxygen increasing effect is improved.

The upper end of the anaerobic cavity 8 is connected with the water inlet pipe 1 through a return pipe 15 and is used for returning the denitrification liquid, a return pump 16 is arranged on the return pipe 15, and the return pump 16 is used for controlling the return proportion. When the reflux pump 16 drives the denitrification liquid to reflux, the flow of the tail water can be promoted, and the dissolved oxygen concentration in the anaerobic chamber 8 is low, so that the dissolved oxygen in partial water can be neutralized after being mixed with the tail water, and the dissolved oxygen concentration in the aerobic chamber 6 can be reduced.

The water outlet pipe 2 is used for discharging the treated water to the culture equipment, the water outlet pipe 2 is connected with the reservoir 12, and the water outlet pipe 2 is provided with an ultraviolet disinfection device 13. The ultraviolet disinfection device 13 can sterilize through ultraviolet rays, reduce the content of bacteria in water, and improve the safety of aquatic products.

The internal circulation method of the tail water of the aquaculture comprises

Introducing aquaculture tail water into a water inlet pipe 1, wherein water at the upper part of an anaerobic cavity 8 flows back to the water inlet pipe 1 through a return pipe 15, is mixed with the tail water, sequentially passes through an aerobic cavity 6, an anoxic cavity 7 and the anaerobic cavity 8 and enters a water outlet tray 11, the oxygen content in the water is gradually reduced in the aerobic cavity 6, partial COD in the water is degraded, and partial nitrogen is removed; in the anoxic chamber 7 and the anaerobic chamber 8, carbon and nitrogen in the water are removed. Wherein, the reflux ratio of the tail water at the upper part of the anaerobic cavity 8 is 100-200%.

The water in the water outlet tray 11 falls downwards to the reservoir 12, and oxygen in the air enters the water to improve the oxygen content;

the water in the reservoir 12 is pumped into aquaculture equipment to realize cyclic utilization.

The tail water flows upwards firstly, then flows downwards and then continues to flow upwards in the treatment mechanism, the snake-shaped flow is realized, the flow path is long, and the retention time of the sewage in the treatment mechanism can be ensured. In a preferred embodiment, the total time of the tail water staying in the aerobic chamber 6, the anoxic chamber 7 and the anaerobic chamber 8 is 2-3h.

The utility model discloses let in tail water from processing mechanism's bottom, the water after the processing is discharged from processing mechanism's top for the discharged water has certain height, so that carry out the oxygenation through the mode that falls, thereby do not need extra aeration equipment, entire system only needs an intake pump 14 to provide tail water mobile power and a backwash pump 16 provides backward flow power, just can maintain the operation, realizes the continuous purification of tail water. Will the utility model discloses a inlet tube 1 links to each other with the bottom of cultured equipment one end, links to each other outlet pipe 2 with the top of cultured equipment's the other end, can realize breeding the circulation of water and purify and utilize.

The utility model has the advantages of simple structure, aquaculture tail water internal circulation system simple structure, the volume ratio is less, and the processing procedure is also simple, is only used for the circulation processing of aquaculture tail water, is not suitable for the higher sewage treatment of pollutant concentration, consequently, the pollutant concentration of intaking need be controlled, and specifically, tail water quality of water is: the temperature is more than or equal to 28 ℃, the pH is 7.0-8.0, the COD is less than or equal to 100mg/L, the TN is less than or equal to 15mg/L, the TP is less than or equal to 2mg/L, and the SS is less than or equal to 150mg/L.

In order to fully remove the phosphorus in the water, a chemical phosphorus removal agent can be added into the reservoir 12, the reservoir 12 also has a sedimentation tank, the SS can be removed after the tail water is precipitated, the water is discharged from the water outlet pipe 2, and the ultraviolet disinfection device 13 on the water outlet pipe 2 is used for sterilization and disinfection.

The tail water is treated by the process, and the removal rates of COD, TN, TP and SS in the tail water can reach 90%, 80% and 80% respectively.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Aquaculture tail water internal circulation system which characterized in that: comprises a water inlet pipe (1), a treatment mechanism, an aeration mechanism and a water outlet pipe (2);

the treatment mechanism comprises an outer shell (3), an inner barrel (4) is arranged inside the outer shell (3), an aerobic cavity (6) is arranged inside the inner barrel (4), a cavity between the outer shell (3) and the inner barrel (4) is divided into an anoxic cavity (7) and an anaerobic cavity (8) by a separation barrel (5), the upper end of the aerobic cavity (6) is communicated with the upper end of the anoxic cavity (7), and the lower end of the anoxic cavity (7) is communicated with the lower end of the anaerobic cavity (8);

the aeration mechanism comprises a water outlet disc (11), a reservoir (12) is arranged below the water outlet disc (11), and a water drop aeration interval is arranged between the water outlet disc (11) and the reservoir (12);

a water inlet pump (14) is arranged on the water inlet pipe (1) and is connected with the lower end of the aerobic cavity (6), and the upper end of the anaerobic cavity (8) is connected with the water outlet disc (11); the water outlet pipe (2) is connected with the water storage tank (12).

2. The aquaculture tail water internal circulation system of claim 1, wherein: an ultraviolet disinfection device (13) is arranged on the water outlet pipe (2).

3. The aquaculture tail water internal circulation system of claim 1, wherein: the bottom plate of the water outlet tray (11) is provided with a plurality of uniformly distributed water falling holes.

4. The aquaculture tail water internal circulation system of claim 1, wherein: the aerobic cavity (6) is internally provided with a hollow microsphere suspension filler (9), and the anoxic cavity (7) and the anaerobic cavity (8) are internally provided with an activated carbon filler (10).

5. The aquaculture tail water internal circulation system of claim 4, wherein: the adding amount of the hollow microsphere suspension filler (9) is 20-30% of the effective volume of the aerobic cavity (6).

6. The aquaculture tail water internal circulation system of claim 4, wherein: the adding amount of the active carbon filler (10) is 40-60% of the effective volume of the anoxic cavity (7) and the anaerobic cavity (8).