WO2020238253A1

WO2020238253A1 - Recirculating aquaculture water treatment system integrating tailwater treatment

Info

Publication number: WO2020238253A1
Application number: PCT/CN2020/071814
Authority: WO
Inventors: 江兴龙
Original assignee: 集美大学
Priority date: 2019-05-28
Filing date: 2020-01-13
Publication date: 2020-12-03
Also published as: CN110156263A

Abstract

Disclosed is a recirculating aquaculture water treatment system integrating tailwater treatment, the system comprising: a wastewater collection tank (1), a physical filtration device (2), a biofilter processing unit employing electrode and suspended-filler coupling technology (3), and an ozone-ultraviolet combined pathogen-killing microorganism tank (4), which are connected in sequence. The wastewater collection tank (1), the physical filtration device (2), the biofilter processing unit employing electrode and suspended-filler coupling technology (3), and the ozone-ultraviolet combined pathogen-killing microorganism tank (4) are all connected to a sludge thickening and dewatering device (5). The ozone-ultraviolet combined pathogen-killing microorganism tank (4) is further connected to an aquaculture tank (6). The invention helps sustain the water quality of the aquaculture system.

Description

Integrated water treatment system for circulating aquaculture and tail water treatment

Technical field

The invention relates to an integrated water treatment system for circulating aquaculture and tail water treatment.

Background technique

Circulating aquaculture has developed rapidly in recent years, and the scale of aquaculture has been expanding. The types of freshwater circulating aquaculture mainly include eel, sturgeon, cod, tilapia and Litopenaeus vannamei, etc., which have the advantages of water saving, land saving, high yield, high efficiency and high quality and safety of aquatic products. Although many of the current daily water cycle utilization rates can reach more than 90%, even the highest international water cycle utilization rate can reach 97%. However, generally there is still about 10% of high-concentration wastewater every day (mainly in the water treatment process, the backwash water or sewage of the treatment unit, containing residual bait, feces, and falling biofilms and other high-concentration nitrogen and phosphorus pollution Sludge) The tail water needs to be discharged from the system. In addition to the filter press or other particulate sludge thickening and dewatering equipment, the tail water can be used to thicken and dehydrate the sewage to form a mud cake. Most of the remaining sewage (≥98%) contains high concentrations of total nitrogen (generally> 5mg/L) and total phosphorus (generally> 1mg/L), that is, the effluent tail water produced by the recirculating aquaculture system, which exceeds the "Freshwater Aquaculture Tail Water Discharge" The discharge standards stipulated in "Requirements" (SC/T 9101) also exceed the Class III water quality standards in the National Environmental Quality Standards for Surface Water (GB3838-2002). At present, the effluent aquaculture tail water produced by the circulating aquaculture system is basically discharged directly to the surrounding waters without treatment. A very small number of additional ecological ponds, artificial wetlands or combined use of chemical flocculation and sedimentation are further processed outside the system to achieve Discharge. However, it needs to increase the floor space, equipment investment and operating costs. Many farms have failed to carry out tail water discharge treatment due to land area restrictions and high treatment costs, polluting the surrounding water environment or facing the problem of forced suspension of production due to non-compliance with environmental protection standards.

The current circulating water aquaculture water treatment system is based on the biological characteristics and ecological habits of the aquaculture objects (such as fish and shrimp) and the safe concentration requirements for the main factors of water quality such as ammonia nitrogen and nitrite nitrogen. The treatment process and the construction of the corresponding water treatment unit enable the water quality of the circulating aquaculture water to meet the healthy aquaculture requirements of the aquaculture objects and realize the healthy growth of the aquaculture objects. It does not have the function of treating tail water up to standard discharge.

Summary of the invention

technical problem

The technical problem to be solved by the present invention is to provide an integrated water treatment system for circulating aquaculture and tail water treatment, which has the characteristics of high water treatment efficiency and continuous maintenance of high water quality in the breeding system, and the water cycle utilization rate can reach 95%~ 98%; not only can fully meet the healthy breeding needs of the breeding objects and realize the healthy growth of the breeding objects, but also has the tail water treatment function, which can achieve the discharge of the tail water up to the standard.

The solution to the problem

Technical solutions

The present invention is realized as follows:

An integrated water treatment system for circulating aquaculture and tail water treatment. The water treatment system includes a sewage collection tank, a physical filtration device, an electrode-suspended filler coupled biological filter treatment unit, an ozone and ultraviolet combination to kill pathogenic microorganisms and sludge Concentration and dehydration device; the sewage collection tank is connected with a physical filter device, the physical filter device is connected to an electrode-suspended filler coupled biological filter processing unit, and the electrode-suspended filler coupled biological filter processing unit is combined with ozone ultraviolet rays The pathogen-killing microorganism pool is arranged adjacently. The sewage collection tank, the physical filter device, the electrode-suspended filler coupling biological filter processing unit, and the ozone-ultraviolet combination pathogen-killing microorganism pool are all connected to the sludge concentration and dehydration device. The combined pathogenic microorganism pool is also connected to the breeding pool;

The electrode-suspended filler coupled biological filter processing unit includes a biological filter, a suspended filler, a direct current cathode and anode electrode array combination, an electric stirring device, and a carbon source supplement device. The suspended filler is arranged in the biological filter, and the direct current The cathode and anode electrode array combination is arranged on the upper part of the biological filter, the electric stirring device is arranged on the lower part of the biological filter, the bottom of the biological filter is arranged with a sludge bucket, and the electric stirring device is arranged on Above the sludge bucket, the carbon source supplement device is connected to the biological filter through a pipeline;

The volume ratio of the suspended filler to the water in the biological filter is 20% to 50%, and the density of the suspended filler is 0.92 to 0.98 g/cm ³ ; the anode in the DC cathode and anode electrode array combination is iron, The cathode is iron, carbon or copper; the rotational speed of the electric stirring device is 100-300 r/min.

Further, the suspended filler is made of high-density polyethylene with a specific surface area greater than 500 m ² /m ³ .

Further, the distance between adjacent electrodes of the direct current cathode and anode electrode array combination is 2-30 cm, the operating voltage and current are respectively: the direct current voltage is 12 to 36 V, and the micro current density is 0.1 to 1.0 mA/cm ² .

Further, the biological filter is a combination of more than two cells in series, and some or all of the cells can be equipped with a direct current cathode and anode electrode array combination.

Further, the physical filtering device is an automatic backwash screen filter, a micro filter or an arc screen.

Further, the ozone-ultraviolet combination inactivating pathogenic microorganisms tank includes an ozone tank and an ultraviolet lamp-aeration tank which are arranged adjacently, and a microporous aeration pan is arranged at the bottom of the ozone tank, and the microporous aeration pan is connected to the outside of the tank. Connected to the ozone generator; the ultraviolet lamp-the upper part of the aeration tank is provided with an ultraviolet lamp, the bottom of the ultraviolet lamp-the aeration tank is provided with an aeration microporous tube, the aeration microporous tube is connected to the air pump outside the tank Connected, the water inlet of the ultraviolet lamp-aeration tank is set at the bottom, and the water outlet is set at the upper part; the bottom of the ozone tank and the ultraviolet lamp-aeration tank are both provided with a sludge bucket, and the sludge bucket is The mud thickening and dewatering device is connected.

Further, the ozone generator inputs ozone 4 to 12 times a day to treat the water body, and each lasts for 20-60 minutes; the hydraulic residence time in the ultraviolet lamp-aeration tank is 15-40 minutes.

Further, the ultraviolet lamp is immersed.

The beneficial effects of the invention

Beneficial effect

The present invention has the following advantages:

In short, the present invention mainly integrates iron cation phosphate precipitation reaction, iron cation hydrate and its polymer flocculation precipitation effect on phosphorus and other particles, nitrification through a series of physical, chemical and microbiological actions produced in the biological filter. Reaction and denitrification reaction, etc., to achieve continuous, stable and efficient phosphorus and nitrogen removal, organic matter degradation and suspended solids concentration reduction effects. It has the advantages of simple device structure, less sludge production and no secondary pollution.

The invention integrally realizes the dual functions of circulating aquaculture water treatment and tail water up-to-standard discharge treatment, and has the advantages of saving land, high water treatment efficiency, low investment and operating costs, simple management and the like. The invention has the characteristics of high water treatment efficiency and continuous maintenance of high water quality in the breeding system, and the water cycle utilization rate can reach 95% to 98%; it can not only fully meet the healthy breeding needs of the breeding objects, and realize the healthy growth of the breeding objects, but also has a tail. The water treatment function can realize the discharge of tail water up to standard. It solves the problem that the current circulating aquaculture water treatment system has a single function and does not have the ability to discharge the tail water up to the standard.

Brief description of the drawings

Description of the drawings

The present invention will be further described below with reference to the drawings and embodiments.

Figure 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the combined structure of the electrode-suspended filler coupled biological filter processing unit and the ozone-ultraviolet combined anti-pathogenic microorganism pool in the present invention.

Invention embodiment

Embodiments of the invention

Referring to Figures 1-2, the present invention relates to an integrated water treatment system for circulating aquaculture and tail water treatment. The water treatment system includes a sewage collection tank 1, a physical filter device 2, an electrode-suspended filler coupled biological filter processing unit 3. The ozone and ultraviolet combination kill pathogenic microorganism pool 4 and the sludge thickening and dewatering device 5; the sewage collection tank 1 is connected to the physical filter device 2, and the physical filter device 2 is connected to the electrode-suspended filler coupling biological filter processing unit 3. The electrode-suspended filler coupling biological filter processing unit 3 is arranged adjacent to the ozone-ultraviolet combination inactivating pathogenic microorganism pool 4, the sewage collection tank 1, the physical filter device 2, the electrode-suspended filler coupled biological filter processing unit 3. The ozone-ultraviolet combined pathogenic microorganism pool 4 is connected to the sludge thickening and dewatering device 5, and the ozone-ultraviolet combined pathogenic microorganism pool 4 is also connected to the breeding pool 6;

The electrode-suspended filler coupled biological filter processing unit 3 includes a biological filter 31, a suspended filler 32, a direct current cathode and anode electrode array combination 33, an electric stirring device 34, and a carbon source supplement device 35. The suspended filler 32 is installed in the biological filter. In the filter tank 31, the direct current cathode and anode electrode array assembly 33 is arranged at the upper part of the biological filter tank 31, the electric stirring device 34 is arranged at the lower part of the biological filter tank 31, and the bottom of the biological filter tank 31 A sludge bucket 7 is provided, the electric stirring device 34 is installed above the sludge bucket 7, and the carbon source supplement device 35 is connected to the biological filter 31 through a pipeline;

The volume ratio of the suspended filler 32 to the water in the biological filter 31 is 20% to 50%, and the density of the suspended filler 32 is 0.92 to 0.98 g/cm ³ ; in the direct current cathode and anode electrode array combination 33 The anode is iron, and the cathode is iron, carbon or copper; the rotational speed of the electric stirring device 34 is 100-300 r/min.

The suspended filler 32 is made of high-density polyethylene with a specific surface area greater than 500 m ² /m ³ .

The distance between adjacent electrodes of the direct current cathode and anode electrode array combination 33 is 2-30 cm, the operating voltage and current are respectively: the direct current voltage is 12 to 36 V, and the micro current density is 0.1 to 1.0 mA/cm ² .

The biological filter 31 is a combination of two or more tank bodies in series, and a direct current cathode and anode electrode array combination 33 may be provided in part or all of the tank bodies.

The physical filtration device 2 is an automatic backwashing screen filter, a micro filter or an arc screen.

The ozone-ultraviolet combination inactivating pathogenic microorganisms pool 4 includes an ozone pool 41 and an ultraviolet lamp-aeration pool 42 which are adjacently arranged. The bottom of the ozone pool 41 is provided with a microporous aeration pan 411, the microporous aeration pan 411 Connected to the ozone generator outside the tank; the ultraviolet lamp-aeration tank 42 is provided with an ultraviolet lamp 421 at the upper part, and the bottom of the ultraviolet lamp-aeration tank 42 is provided with an oxygen-enhancing microporous tube 422, the oxygen-enhancing micro The orifice tube 422 is connected with an air pump outside the tank. The water inlet of the ultraviolet lamp-aeration tank 42 is set at the bottom, and the water outlet is set at the upper part; the bottom of the ozone tank 41 and the ultraviolet lamp-aeration tank 42 are both set The sludge bucket 7 is connected to the sludge thickening and dewatering device 5.

The ozone generator inputs ozone 4 to 12 times a day to treat the water body, and the duration of each time is 20-60 minutes; the hydraulic residence time in the ultraviolet lamp-aeration tank 42 is 15-40 minutes.

The ultraviolet lamp 421 is immersed. The working process of the present invention is as follows: after the farming tail water enters the sewage collection tank 1, it is extracted by the water pump into the physical filter device 2, and the filtered water enters the electrode-suspended filler coupling biological filter processing unit 3, and contains residual bait and feces The backflush water (≤1.5%) of other large particles enters the sludge thickening and dewatering device 5; in the sludge thickening and dewatering device 5, the thickened and dewatered sludge is formed into a mud cake, and the organic fertilizer is transported out of the system, and the concentrated and filtered The water returns to the sewage collection tank 1, or is discharged out of the system; in the electrode-suspended filler coupled biological filter processing unit 3, a sludge bucket 7 is provided at the bottom of the biological filter 31, which can be discharged regularly. The sludge water (≤3 %) is discharged into the sludge thickening and dewatering device 5; the water treated by the electrode-suspended filler coupling biological filter processing unit 3 flows into the ozone and ultraviolet combination to kill pathogenic microorganisms pool 4 to kill pathogenic microorganisms and moderate aeration to obtain purification The purified water flows back to the breeding pond; the ozone-ultraviolet combined anti-pathogenic microorganism pond 4 is equipped with a sludge bucket 7, which can be discharged regularly, and the sludge water (≤0.5%) is discharged into the sludge thickening and dewatering device 5.

The working principle of each device is as follows:

1. Sewage collection tank 1 mainly collects the aquaculture tail water discharged from all aquaculture tanks. More than 2 submersible pumps (1 of which are spare) are installed in the tank to extract the water to the physical filtration device 2.

2. The physical filtration device 2 is a physical filtration device such as an automatic backwashing screen filter, a microfilter or an arc screen, which separates large particulate matter in the water, and automatically backflushes the water containing large particulate matter such as residual bait and feces ( ≤1.5%) enter the sludge dewatering and thickening device 5, and the water filtered by the screen enters the electrode-suspended filler coupling biological filter processing unit 3.

3. The working principle of electrode-suspended filler coupling biological filter processing unit 3 is as follows:

(1) Due to the action of the direct current electric field of the direct current cathode and anode electrode array 33, the iron (anode) generates a large amount of iron cations, and the large amount of Fe ²⁺ and Fe ³⁺ produced reacts with the phosphate in the aquaculture tail water to form Granular, insoluble substances settle in the bottom sludge bucket 7 of the biological filter 31; at the same time, iron cations undergo a series of hydrolytic polymerization reactions, Fe ²⁺ and Fe ³⁺ and their hydrates such as iron hydroxide It has strong flocculation and precipitation effects on phosphorus, and can also generate polymers with adsorption and coagulation effects, such as part of Fe ³⁺ hydrolysis, such as [Fe ₂ (OH) ₂ ] ⁴⁺ , [Fe ₃ ( OH) ₄ ] ⁵⁺ , [Fe ₅ (OH) ₉ ] ⁶⁺ and other polynuclear hydroxyl complexes, which can act as flocculants and can interact with some suspended substances (including suspended phosphorus, including biological phosphorus and The insoluble phosphate particles, particulate matter, electrolytes, etc. undergo a sedimentation effect and settle in the bottom sludge bucket 7 of the biological filter 31.

(2) Utilizing the dissolved oxygen contained in the aquaculture tail water and the oxygen produced by the electrolysis of the iron anode water can provide a large number of nitrosating and nitrifying bacteria in the biofilm attached to the suspended filler 32 with the dissolved oxygen required for the nitrification reaction, so that the ammonia It is converted into nitrite nitrogen and nitrate nitrogen, so there is no need to set up air pump to increase oxygen; at the same time, due to the rapid consumption of dissolved oxygen, the water in the pool, especially the underwater layer of the pool, quickly forms an anoxic or anaerobic water environment, which promotes the denitrification and denitrification reaction The progress.

(3) The heterotrophic denitrifying bacteria in the pond use the organic carbon source in the aquaculture water as an electron donor to cause a denitrification reaction, so that the nitrate nitrogen eventually generates nitrogen through the denitrification reaction and overflows the system to be removed.

(4) The hydrogen produced by the cathode electrolysis of water can be used as an electron donor for hydrogen autotrophic denitrifying bacteria, and the CO _{2 in the} tail water can provide an inorganic carbon source for these autotrophic bacteria, and an autotrophic denitrification reaction occurs to make nitrates. Nitrogen generates nitrogen gas through denitrification reaction and overflows the system to be removed.

In addition, the hydrogen produced by the electrolysis of water can stimulate the growth and metabolism of autotrophic denitrifying bacteria attached to the surface of the suspended filler 32. At the same time, the redox substances produced by the electrolysis provide a suitable environment for the growth and reproduction of microorganisms, which is beneficial to the growth of autotrophic denitrifying bacteria. The denitrification process provides inorganic carbon sources and electron donors to further promote the autotrophic denitrification process, thereby improving the removal of total nitrogen.

(5) Utilizing the density (0.92～0.98g/cm ³ ) of the suspended filler 32 is close to fresh water, it is easy to form a uniform suspension in the water body of the biological filter. At the same time, the continuous slow stirring of the electric stirring device 34 and the water flow Under the condition, a fluidized state can be formed, so that the biofilm attached to the suspended filler 32 is easy to continuously flow and contact with the pollutants in the aquaculture wastewater, which not only helps to increase the rate of nitrification and denitrification reactions, but also facilitates the suspension of the filler 32 and The water flow continuously rubs and flows through the surface of the electrode. Under the same volume, the suspended filler with a density of 0.92～0.98g/cm ³ has greater friction, which can better remove the surface oxide of (anode) iron and prevent (anode) iron The surface is passivated by forming a dense covering layer with oxide, which affects the normal progress of the electrode electrolysis reaction and effectively solves the passivation problem of (anode) iron.

(6) The micro current can strengthen the bacteria and other microorganisms in the biofilm on the suspended filler 32, can change the permeability of the bacterial cell membrane, and help the enzymes in the bacterial cell membrane to pass through the cell membrane to the wastewater for a series of enzymatic reactions. It increases the contact between the enzymes in the cell membrane and the reaction substrate in the water, thereby enhancing the effect of degrading nitrogen and phosphorus in aquaculture wastewater to a certain extent; in addition, the microcurrent can also directly stimulate and strengthen the activity of extracellular enzymes secreted by certain bacteria. Promote the degradation of nitrogen, phosphorus and other pollutants in the water.

(7) Since the concentration of organic carbon in the aquaculture tail water is generally low and will be consumed soon, in order to promote the progress of the heterotrophic denitrification reaction in the pond, the carbon source supplement device 35 is used to add supplementary carbon sources such as brown sugar. It can be equipped with an automatic dosing device, regularly add a certain amount of brown sugar to the solution tank, start the mixer for dissolution, and automatically put a certain amount into the pool through the metering pump through the pipeline to continuously and quickly promote the heterotrophic denitrification reaction get on.

Because the reaction rate of heterotrophic denitrification is several times (about 7 times) faster than autotrophic denitrification, at the same time, the population growth and propagation speed of heterotrophic denitrifying bacteria are higher than that of autotrophic denitrifying bacteria. Therefore, adding additional organic carbon sources such as brown sugar can significantly accelerate denitrification and denitrification.

And the removal rate of TP has a certain positive correlation with the removal rate of TN, that is, when the TN removal effect is good, TP also has a good removal effect. In the present invention, the iron electrode can provide electrons required for the denitrification reaction, has a certain enhanced denitrification effect, promotes the reduction of the mass concentration of NO ₃ ^-- N and TN, and is beneficial to promote the phosphorus accumulating bacteria in the filler biofilm and in the water Biological phosphorus removal, synergistically promotes the removal of TP. In addition, the supplementary carbon source used in the present invention efficiently promotes the denitrification device, which greatly promotes the continuous progress of denitrification and promotes the reduction of NO ₃ ^-- N and TN mass concentrations. Synergy promotes continuous deep removal of TP concentration. Therefore, the electrode-suspended filler coupling technology of the present invention and the supplementary carbon source efficiently promote the integration and integration of the denitrification technology and cooperate with each other to improve the efficiency and removal rate of nitrogen and phosphorus removal.

4. Sludge thickening and dewatering device 5. Using sludge filter press equipment or setting up filter layer drying tank facilities, the thickened and dewatered sludge is formed into mud cake (organic fertilizer) and transported out of the system, and the filtered water is Return to the sewage collection tank 1, or discharge out of the system.

5. The ozone and ultraviolet combination kill pathogenic microorganism pool 4 is formed by the combination of ozone pool 41 and ultraviolet lamp-aeration pool 42. The combined pool is adjacent to the electrode-suspended filler coupled biological filter processing unit 3, and the water treated by the electrode-suspended filler coupled biological filter processing unit 3 flows into the ozone pool 41, and is set on the lower or bottom layer of the water in the ozone pool 41 The microporous aeration pan 411 is connected to the ozone generator outside the pool through a pipeline, and ozone is input at regular intervals (usually 4-12 times a day) to treat the water body. The single duration of ozone treatment is 20-60min;

The treated water flows into the UV lamp-aeration tank 42, where the upper and middle layer of the water in the pool is provided with an immersion UV lamp 421 or the upper layer is provided with a UV lamp 421, and the bottom layer is provided with an oxygen-enhancing microporous tube 422, which is connected by a pipe The air pump outside the pool, the air is fed into the oxygen-enhancing microporous tube 422 to add oxygen to the pool water. At the same time, the continuously generated tiny bubbles can clean the quartz tube wall of the UV lamp 421 to prevent adhesion of attachments and maintain high UV Light transmittance; the pool water in the ultraviolet lamp-aeration tank 42 flows from bottom to top at a certain flow rate to produce an upward flow, which flows through the ultraviolet light area constructed by the combination of ultraviolet light 421. In the ultraviolet light area, the ozone in the water is in the ultraviolet light Under the irradiation of, it can generate more oxidative hydroxyl radicals. The hydroxyl radicals will quickly react with oxidizable substances in the water to accelerate the decomposition of ozone. Because hydroxyl radicals are more oxidizing than ozone, they can be deeply oxidized. Oxidize and quickly react with oxidizable substances in the water body, thereby achieving a stronger ability to kill bacteria, viruses, fungi, microalgae, parasites, eggs and spores and other microorganisms in the water, while efficiently removing the water The residual ozone concentration prevents the residual ozone concentration from entering the breeding pond with the effluent and endangering the breeding animals; the hydraulic residence time HRT of the water treatment in the ultraviolet lamp-aeration tank 42 is about 15-40 minutes, and the purified water after treatment is set in the upper part of the pond The water collection pipe at the water outlet is collected and then connected to the drain pipe to flow out and return to the breeding pond 6. In addition, a sludge bucket 7 is installed at the bottom of the ozone tank 41 and the ultraviolet lamp-aeration tank 42 to settle the sludge in the water. The sludge bucket 7 is equipped with a sludge discharge pipe to regularly discharge sewage containing sludge. To sludge thickening and dewatering device 5.

The present invention will be further described below in conjunction with specific embodiments.

Using the above methods and devices, an integrated water treatment system for circulating aquaculture and tail water treatment was constructed, which was applied to eel circulating aquaculture, and the water cycle utilization rate was as high as 98%. The monitoring results are as follows:

In the above table, the water in the aquaculture pond refers to the water quality in the aquaculture pond in the circulating water aquaculture system during the breeding period; the treated effluent refers to the purified water quality after the ozone-ultraviolet combination kills pathogenic microorganism tank 4; the external drainage refers to the sludge through the sludge thickening and dewatering device The filtered water after concentrated dehydration can be discharged from the system.

From the data in the table, it can be seen that the water quality in the aquaculture pond in the recirculating aquaculture system during the aquaculture period can meet the Class III water quality standard in the National Surface Water Environmental Quality Standard (GB3838-2002) and the National Fishery Water Quality Standard (GB11607-1989) ; The quality of the discharged water outside the system can meet the national "Surface Water Environmental Quality Standards" (GB3838-2002) in the Class III water quality standards and the "Freshwater Farming Tail Water Discharge Requirements" (SC/T 9101) stipulated in the first level discharge standards .

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described by us are only illustrative, and are not used to limit the scope of the present invention. The equivalent modifications and changes made by the skilled person in accordance with the spirit of the present invention should all fall within the protection scope of the claims of the present invention.

Claims

An integrated water treatment system for circulating aquaculture and tail water treatment, characterized in that: the water treatment system includes a sewage collection tank, a physical filtration device, an electrode-suspended filler coupling biological filter treatment unit, and a combination of ozone and ultraviolet rays to kill pathogenic microorganisms Tank and sludge thickening and dewatering device; the sludge collection tank is connected to a physical filter device, the physical filter device is connected to an electrode-suspended filler coupled biological filter processing unit, and the electrode-suspended filler coupled biological filter processing unit Adjacent to the ozone-ultraviolet combined pathogenic microorganisms tank, the sewage collection tank, the physical filter device, the electrode-suspended filler coupling biological filter processing unit, and the ozone-ultraviolet combined pathogenic microorganisms tank are all connected to the sludge concentration and dehydration device. The ozone-ultraviolet combination inactivating pathogenic microorganism pool is also connected to the breeding pool;

The electrode-suspended filler coupled biological filter processing unit includes a biological filter, a suspended filler, a direct current cathode and anode electrode array combination, an electric stirring device, and a carbon source supplement device. The suspended filler is arranged in the biological filter, and the direct current The cathode and anode electrode array combination is arranged on the upper part of the biological filter, the electric stirring device is arranged on the lower part of the biological filter, the bottom of the biological filter is arranged with a sludge bucket, and the electric stirring device is arranged on Above the sludge bucket, the carbon source supplement device is connected to the biological filter through a pipeline;

The volume ratio of the suspended filler to the water in the biological filter is 20% to 50%, and the density of the suspended filler is 0.92 to 0.98 g/cm 3 ; the anode in the DC cathode and anode electrode array combination is iron, The cathode is iron, carbon or copper; the rotational speed of the electric stirring device is 100-300 r/min.
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 1, wherein the suspended filler is made of high-density polyethylene with a specific surface area greater than 500 m 2 /m 3 .
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 1, wherein the distance between adjacent electrodes of the direct current cathode and anode electrode array combination is 2-30 cm, and the operating voltage and The currents are respectively: DC voltage is 12-36V, and micro-current density is 0.1-1.0mA/cm 2 .
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 1, characterized in that: the biological filter is a combination of more than two tank bodies in series, and some or all of the tank bodies can be equipped with direct current cathode and anode electrodes Array combination.
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 1, wherein the physical filtration device is an automatic backwash screen filter, a micro filter or an arc screen.
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 1, characterized in that: the ozone-ultraviolet combination kills pathogenic microorganisms pool comprises adjacently arranged ozone pool and ultraviolet lamp-aeration pool, The bottom of the ozone tank is provided with a microporous aeration pan, the microporous aeration pan is connected to the ozone generator outside the tank; the upper part of the ultraviolet lamp-aeration tank is provided with a ultraviolet lamp, the ultraviolet lamp-aeration The bottom of the pool is provided with an oxygen-enhancing microporous tube, which is connected to an air pump outside the pool, the water inlet of the ultraviolet lamp-aeration pool is arranged at the bottom, and the water outlet is arranged at the upper part; the ozone pool A sludge bucket is provided at the bottom of the ultraviolet lamp-aeration tank, and the sludge bucket is connected with the sludge thickening and dewatering device.
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 6, characterized in that the ozone generator inputs ozone 4 to 12 times a day to treat the water body, and the duration of each time is 20 to 60 minutes. The hydraulic residence time in the ultraviolet lamp-aeration tank is 15-40min.
The integrated water treatment system for circulating aquaculture and tail water treatment according to claim 6, wherein the ultraviolet lamp is immersed.