Fishing, light and sewage complementary marine aquaculture system

Abstract

The utility model belongs to the field of new energy and environmental protection, and particularly relates to a fishing, light and sewage complementary marine aquaculture system. The fishery, light and sewage complementary marine culture system provided by the utility model comprises a photovoltaic power generation device, a marine culture pond and a marine culture tail water treatment device, wherein the marine culture tail water treatment device comprises a sedimentation tank, a hydrolysis acidification tank, a filter, an adsorption dephosphorization and denitrification bed, an optional catalytic electrolysis decolorization device and an optional sludge treatment device which are connected in sequence. When the fishery, light and sewage complementary marine aquaculture system is adopted to treat marine aquaculture wastewater, pollutants such as nitrogen and phosphorus in aquaculture tail water and chromaticity can be efficiently removed, up-to-standard discharge of effluent is achieved, space utilization of marine aquaculture is improved and investment and operation cost is reduced by introducing the photovoltaic power generation device, and the system is suitable for large-scale popularization and application. A solution which is economical and applicable and has a good treatment effect is provided for current marine aquaculture wastewater treatment.

Description

Technical Field

[0001] The present application belongs to the field of new energy and environmental protection, and specifically relates to a fishery, light and pollution complementary marine aquaculture system. Background Art

[0002] Mariculture is a production method that uses shallow seas, mudflats, harbors, and ponds to raise and breed marine economic animals and plants. It is one of the important ways for humans to use marine biological resources and develop marine aquaculture. The objects of mariculture are mainly fish, shrimps, crabs, shellfish, algae, sea cucumbers, and other economic animals and plants. Different species of mariculture objects have different growth rates, types and quantities of bait, and the concentrations of major pollutants in the discharged wastewater are also quite different. For example, shrimps are raised in high-density ponds. Due to the high density of bait and the large amount of bait, there are more feces in the discharged wastewater. The chromaticity, ammonia nitrogen, total nitrogen, and total phosphorus content of the discharged tail water are high, but the COD content is low. Under normal circumstances, the chromaticity of the discharged tail water is 200-500 times, the ammonia nitrogen content is 2-10 mg / L, the total phosphorus content is 1.0-2.5 mg / L, and the COD is ≤30 mg / L. At the same time, even for the same aquaculture object or even the same aquaculture pond, the concentrations of major pollutants such as chromaticity, ammonia nitrogen, total nitrogen, total phosphorus and COD in the tail water discharged in winter and summer are different, showing a phenomenon of low concentration in winter and high concentration in summer. In addition, the concentration of major pollutants in aquaculture tail water is also closely related to the aquaculture model and drainage method. If the tail water of aquaculture is discharged directly, its main pollutants and their concentrations are: COD Cr The content is 20-30 mg / L, BOD5 content is 8-15 mg / L, ammonia nitrogen content is 0.5-8 mg / L, total nitrogen content is 3-0 mg / L, total phosphorus content is 1-2.0 mg / L, and the color is 200-500 times. In short, the tail water of marine aquaculture contains high concentrations of pollutants such as ammonia nitrogen, total nitrogen, total phosphorus and COD. If it is not treated and discharged directly into the environment, it will cause the COD of natural water bodies such as the ocean. Cr , BOD5, nitrogen and phosphorus concentrations exceed the standard, and the water body is eutrophic. Therefore, it is necessary to purify the tail water of marine aquaculture.

[0003] Chroma and COD in Mariculture Tail Water Cr, BOD5, ammonia nitrogen, and total phosphorus treatment methods include physical methods, chemical methods, and biochemical methods. Biological methods include activated sludge method, biofilm method, algae culture, and aquatic plant cultivation (artificial wetlands) and other treatment technologies. Although activated sludge method, biofilm method, and artificial wetlands have been successfully applied in current sewage treatment practices, such as various types of urban sewage treatment, industrial wastewater treatment projects, etc., there are a lack of successful cases in the application of marine aquaculture tailwater treatment. At present, most marine aquaculture tailwater treatment adopts a method that combines multiple oxidation ponds in series with the addition of dephosphorization agents for precipitation, that is, the three-pond and two-dam method. Practice has proved that although the above-mentioned marine aquaculture tailwater treatment methods have certain effects, the color and COD of the effluent are not good. Cr Most of the pollutant indicators such as ammonia nitrogen, total nitrogen and total phosphorus are difficult to meet the discharge standards, causing great pollution to the surrounding environment. In addition, due to the high salt content and COD Cr The BOD5 is low, and the ratio of carbon, nitrogen and phosphorus is seriously unbalanced. When using biochemical methods or artificial wetlands to treat tailwater, there are the following problems: (1) At present, no microorganisms suitable for seawater have been cultivated, and the effluent does not meet the standards; (2) The investment is large and the land is large; (3) The carbon source needs to be continuously added during operation, the treatment cost is high, and the operation effect is poor; (4) The tailwater treatment volume is large, because marine aquaculture uses a large amount of water (about 100 to 200 tons / mu) and the water is changed frequently. Therefore, different types of marine aquaculture tailwater should use different tailwater purification methods according to the differences in their main pollutants. In addition, there are abundant photovoltaic resources available above both the marine aquaculture pond and the tailwater purification facilities of marine aquaculture. Therefore, with the development of marine aquaculture, it is urgent to find a system that can fully utilize the space above the marine aquaculture pond, is economical and practical, and can achieve marine aquaculture tailwater purification. Utility Model Content

[0004] The purpose of this application is to address the problem that it is difficult to achieve economical and efficient removal of mariculture tail water in the prior art, and to provide a fishery-light-pollution complementary mariculture system that can fully utilize the space above the mariculture pond, is economical and practical, and can purify mariculture tail water.

[0005] Specifically, the fishery-solar-pollution complementary marine aquaculture system comprises a photovoltaic power generation device, a marine aquaculture pond and a marine aquaculture tailwater treatment device, wherein: the photovoltaic power generation device is located in the upper space of the marine aquaculture pond and the marine aquaculture tailwater treatment device, and is used to generate electricity and supply power using solar energy; the photovoltaic power generation device comprises a photovoltaic bracket, a plurality of solar panels, a junction box, an inverter and a booster station, the output end of the inverter is connected to the electrical appliances of the fishery-solar-pollution complementary marine aquaculture system on one side to provide power to the electrical appliances, and is connected to the power grid through the booster station on the other side to supply power to the power grid;

[0006] The marine aquaculture tailwater treatment device is used for purifying and treating aquaculture tailwater, and comprises a sedimentation tank, a hydrolysis acidification tank, a filter, and an adsorption phosphorus removal and denitrification bed which are connected in sequence. The tailwater outlet of the marine aquaculture tank is connected to the water inlet of the sedimentation tank, the water outlet of the sedimentation tank is connected to the water inlet of the hydrolysis acidification tank, the water outlet of the hydrolysis acidification tank is connected to the water inlet of the filter, the clean water outlet of the filter is connected to the water inlet of the adsorption phosphorus removal and denitrification bed, the concentrated water outlet of the filter is connected to the water inlet of the sedimentation tank, and the water outlet of the adsorption phosphorus removal and denitrification bed is connected to the drain; the adsorption phosphorus removal and denitrification bed comprises a filter adsorption tank, an aeration pipe and a special filler for phosphorus adsorption, the aeration pipe is arranged at the bottom of the filter adsorption tank, and the special filler for phosphorus adsorption is filled above the filter brick.

[0007] In some specific embodiments, the filter is a fiber disc filter or a rotary microfilter.

[0008] In some specific embodiments, the pore size of the filter cloth of the filter is 5 to 20 μm.

[0009] In some specific embodiments, the special filler for phosphorus adsorption is selected from at least one of a light iron oxyhydroxide special filler for phosphorus adsorption, a foamed light calcium silicate special filler for phosphorus adsorption, a foamed light aluminum silicate special filler for phosphorus adsorption, a foamed light calcium sulfate special filler for phosphorus adsorption, and a light zirconium oxyhydroxide special filler for phosphorus adsorption.

[0010] In some specific implementations, the thickness of the special filler for phosphorus adsorption is 1 to 6 μm.

[0011] In some specific embodiments, the marine aquaculture tailwater treatment device also includes a catalytic electrolysis decolorization device; the catalytic electrolysis decolorization device includes a catalytic electrolyzer, a DC power supply and a decolorization tank, the water outlet of the adsorption dephosphorization and denitrification bed is connected to the water inlet of the catalytic electrolyzer on one side and to the water inlet of the decolorization tank on the other side, the water outlet of the catalytic electrolyzer is connected to the water inlet of the decolorization tank, and the water outlet of the decolorization tank is connected to the drain.

[0012] In some specific embodiments, a regulating tank is provided on the pipeline connecting the water outlet of the adsorption dephosphorization and denitrification bed and the water inlet of the catalytic electrolyzer, the water inlet of the regulating tank is connected to the water outlet of the adsorption dephosphorization and denitrification bed, one way of the water outlet of the regulating tank is connected to the water inlet of the catalytic electrolyzer and the other way is connected to the water inlet of the decolorization tank.

[0013] In some specific embodiments, the catalytic electrolysis decolorization device includes a pickling device, which includes a pickling solution storage tank and a pickling solution delivery pump. The outlet of the pickling solution storage tank is connected to the water outlet of the catalytic electrolyzer and the pickling solution delivery pump is arranged on the connecting pipeline between the two, and the inlet of the pickling solution storage tank is connected to the water inlet of the catalytic electrolyzer.

[0014] In some specific embodiments, the marine aquaculture tailwater treatment device also includes a sludge treatment device, which includes a sludge pump, a sludge thickening tank, a physical and chemical adjustment tank, a sludge dewatering machine and a sludge tank connected in sequence, the inlet of the sludge thickening tank is connected to the sludge discharge port of the sedimentation tank and the hydrolysis acidification tank via a sludge pump, the water outlet of the sludge dewatering machine is discharged externally in compliance with the standards or connected to the water inlet of the sedimentation tank, and the sludge discharge port of the sludge dewatering machine is connected to the sludge tank.

[0015] In addition, when the fishery-light-pollution complementary mariculture system and / or mariculture tailwater treatment device provided by the present application is used to purify mariculture tailwater, the treatment method includes the following steps:

[0016] S1. Sedimentation and biochemical treatment: The tail water of aquaculture enters the sedimentation tank and the hydrolysis acidification tank. First, the feces, residual feed and other solid particles in the tail water are removed by sedimentation in the sedimentation tank. Then, the COD in the tail water is reduced by the action of anaerobic organisms in the hydrolysis acidification tank. Cr , BOD is oxidized into CO2, organic phosphorus is converted into inorganic acid radicals, protein is hydrolyzed and acidified into ammonia nitrogen, and then the effluent enters the filter;

[0017] S2. Filtration treatment: The effluent after sedimentation and biochemical treatment enters the filter, and the tail water is filtered and separated to obtain 90-95 v / v% clean water and 5-10 v / v% concentrated water. The clean water is subsequently subjected to adsorption and dephosphorization and denitrification treatment, and the concentrated water is returned to the sedimentation tank;

[0018] S3. Adsorption phosphorus removal and denitrification treatment: The clean water obtained by filtering in step S2 enters the adsorption phosphorus removal and denitrification bed and aeration is started. The clean water flows out from top to bottom. The total nitrogen in the clean water is removed by biochemical reaction under aeration conditions. The effluent meets the discharge standards, and the phosphate anion phosphorus adsorption special filler in the clean water is adsorbed and removed from the water body. Among them, the total phosphorus in the effluent of the adsorption phosphorus removal and denitrification treatment is ≤0.3mg / L, and the phosphorus removal rate is 90-99.8%, and the total nitrogen is ≤5mg / L, and the total nitrogen removal rate is 50-60%.

[0019] In some specific embodiments, the method further includes step S4 sludge treatment: the sludge obtained from the sedimentation tank and the hydrolysis acidification tank is transported to a sludge treatment device for dehydration treatment to obtain a filtrate and dehydrated sludge, the filtrate is returned to the sedimentation tank, and the dehydrated sludge is discharged.

[0020] In some specific embodiments, the method also includes electrolytic denitrification and decolorization treatment: all or part of the clean water obtained by adsorption dephosphorization and denitrification in step S3 directly enters the catalytic electrolysis machine, and enters the decolorization tank after electrolysis. At the same time, another part of the clean water obtained by adsorption dephosphorization and denitrification directly enters the decolorization tank, and this part of the clean water is mixed with the clean water after catalytic electrolysis entering the decolorization tank to decolorize the water body and meet the discharge standards.

[0021] In some specific embodiments, in the decolorization tank, the volume ratio of the clean water after catalytic electrolysis to the clean water after adsorptive dephosphorization and denitrification is 1:(8-9).

[0022] Compared with the prior art, this application has the following obvious advantages:

[0023] (1) High effluent quality. This application uses a sedimentation tank, a hydrolysis acidification tank, a filter, and an adsorption phosphorus removal and nitrogen removal bed connected in sequence to treat marine aquaculture wastewater, including the steps of sedimentation biochemical treatment, filtration treatment, and adsorption phosphorus removal and nitrogen removal. The specific process is as follows: the marine aquaculture wastewater first enters the sedimentation tank to remove solid particles such as feces and residual feed in the tail water through sedimentation; then enters the hydrolysis acidification tank to use the action of anaerobic organisms to remove COD in the tail water. Cr , BOD is oxidized into CO2, organic phosphorus is converted into inorganic phosphate, protein is hydrolyzed and acidified into ammonia nitrogen, and then the effluent enters the filter; the filter filters and diverts the incoming tail water to obtain clean water and concentrated water, the concentrated water is returned to the sedimentation tank, and the clean water enters the adsorption phosphorus removal and denitrification bed; the adsorption phosphorus removal and denitrification bed is provided with an aeration pipe and a special filler for phosphorus adsorption, and the total nitrogen in the water can be removed by biochemical reaction under aeration conditions. At the same time, the phosphate anions in the clean water are adsorbed and removed from the water body by the special filler for phosphorus adsorption, and it also has the effect of reducing the chromaticity of the water body, so that the effluent here can meet the discharge standards. Therefore, the fishery, light and pollution complementary marine aquaculture system provided by the present application can effectively remove pollutants such as nitrogen and phosphorus in the aquaculture tail water and can significantly reduce the chromaticity of the effluent. The purified effluent has high water quality and can be directly discharged into the natural environment, solving the problem that it is difficult for traditional marine aquaculture tail water to meet the discharge standards.

[0024] (2) This application adopts the form of fishery, light and pollution complementarity. By introducing photovoltaic power generation equipment, on the one hand, it can make full use of the space for marine aquaculture. On the other hand, photovoltaic power generation can provide electricity for electrical appliances in marine aquaculture and tailwater treatment, reducing operating costs. It can also use excess electricity to increase the flow of electricity into the power grid to obtain a certain income, and can also subsidize infrastructure investment and other expenses.

[0025] (3) Furthermore, the marine aquaculture tailwater treatment device of the present application may also include a catalytic electrolysis decolorization device and a sludge treatment device. The catalytic electrolysis decolorization device can further decolorize the effluent from the adsorption phosphorus removal and nitrogen removal bed. Since chloride ions naturally exist in the marine aquaculture tailwater, no additional catalyst needs to be added during the catalytic electrolysis treatment. At the same time, it also has a certain denitrification effect, further improving the effluent quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plan view of the fishery, light and pollution complementary marine aquaculture system provided by the present application.

[0027] Figure 2 It is a cross-sectional schematic diagram of the fishery, light and pollution complementary marine aquaculture system provided in this application.

[0028] Figure 3 It is a process flow chart of the fishery, light and pollution complementary marine aquaculture system provided in this application.

[0029] Figure 4 It is a cross-sectional schematic diagram of the adsorption dephosphorization and denitrification bed provided in this application.

[0030] Figure 5 This is a specific schematic diagram of catalytic electrolysis decolorization provided by this application

[0031] Figure numerals: 100-photovoltaic power generation device; 200-mariculture pond; 300-mariculture tailwater treatment device; 310-sedimentation tank; 320-hydrolysis acidification tank; 330-filter; 340-adsorption phosphorus removal and denitrification bed; 341-filtration adsorption tank; 342-special filler for phosphorus adsorption; 343-cover plate; 344-green plants; 350-catalytic electrolysis decolorization device; 351-catalytic electrolyzer; 352-DC power supply; 353-decolorization tank; 3531-water inlet; 3532-water outlet; 3533-water distributor; 354-pickling device; 3541-pickling solution storage tank; 3542-pickling solution delivery pump; 360-sludge treatment device. DETAILED DESCRIPTION

[0032] The specific implementation of the present application is described in detail below. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0033] See also Figure 1 and Figure 2The fishery, light and pollution complementary marine aquaculture system provided in the present application includes a photovoltaic power generation device 100, a marine aquaculture pool 200 and a marine aquaculture tailwater treatment device 300. The photovoltaic power generation device 100 is located in the upper space of the marine aquaculture pool 200 and the marine aquaculture tailwater treatment device 300, and is used to generate electricity and supply power using solar energy. The photovoltaic power generation device 100 includes a photovoltaic bracket, a plurality of solar panels, a junction box, an inverter and a booster station. The junction box is used to converge the electric energy generated by the solar panels, and the inverter is used to convert the converged electric energy from direct current to alternating current. The output end of the inverter is connected to the electrical appliances of the fishery, light and pollution complementary marine aquaculture system on one side to provide power to the electrical appliances, and the other side is connected to the power grid through the booster station to supply power to the power grid. Placing the photovoltaic power generation device 100 in the upper space of the marine aquaculture pond 200 and the marine aquaculture tailwater treatment device 300 is conducive to making full use of the abundant photovoltaic energy above the marine aquaculture facilities and the tailwater treatment facilities and obtaining electrical energy. On the one hand, the obtained electrical energy can be used to maintain the electrical energy consumed in the daily operation of marine aquaculture and tailwater treatment, thereby reducing the operating costs. On the other hand, other excess electrical energy can also be connected to the power grid to obtain a certain amount of income, thereby being able to subsidize the capital investment in the construction of the marine aquaculture tailwater treatment device 300 to a certain extent.

[0034] See also Figures 3 to 5 The marine aquaculture tailwater treatment device 300 is used to purify and treat the aquaculture tailwater and discharge it in compliance with the standards, and includes a sedimentation tank 310, a hydrolysis acidification tank 320, a filter 330, and an adsorption phosphorus removal and denitrification bed 340 connected in sequence. The tailwater outlet of the marine aquaculture pond 200 is connected to the water inlet of the sedimentation tank 310, the water outlet of the sedimentation tank 310 is connected to the water inlet of the hydrolysis acidification tank 320, the water outlet of the hydrolysis acidification tank 320 is connected to the water inlet of the filter 330, the clean water outlet of the filter 330 is connected to the water inlet of the adsorption phosphorus removal and denitrification bed 340, the concentrated water outlet of the filter 330 is connected to the water inlet of the sedimentation tank 310, the water outlet of the adsorption phosphorus removal and denitrification bed 340 is connected to the drain, and the effluent meets the standards for discharge. The adsorption phosphorus removal and denitrification bed 340 includes a filter adsorption tank 341, an aeration pipe and a special filler 342 for phosphorus adsorption. The aeration pipe is arranged at the bottom of the filter adsorption tank 341, and the special filler 342 for phosphorus adsorption is filled above the filter brick. The main function of the adsorption phosphorus removal and denitrification bed 340 is to remove the total phosphorus and total nitrogen in the tail water and reduce the chromaticity. The clean water obtained by the filter 330 enters the filter adsorption tank 341 and flows out from the top to the bottom. The aeration pipe arranged at the bottom of the filter adsorption tank 341 removes the total nitrogen in the clean water through aeration and bacterial cultivation, so that the total nitrogen in the clean water is effectively removed. At the same time, the clean water flows through the special filler 342 for phosphorus adsorption, so that the phosphorus in the water is adsorbed and removed, and the total phosphorus concentration and total nitrogen concentration and chromaticity of the water discharged from the filter adsorption tank 341 are reduced, so that the effluent meets the discharge standards.

[0035] Furthermore, the adsorption dephosphorization and denitrification bed 340 may also include filter bricks, a cover plate 343 and green plants 345 above the cover plate. The filter bricks are arranged at the bottom of the filter adsorption tank 341 together with the aeration pipe, and the cover plate 343 is arranged at the top of the filter adsorption tank 341.

[0036] Part of the clean water obtained by the filter 330 enters the adsorption dephosphorization and denitrification bed 340 for subsequent purification treatment, and the other part of the clean water enters the filter 330 for backwashing the filter cloth, and the concentrated water obtained is returned to the sedimentation tank 310.

[0037] In some specific embodiments, the sedimentation tank 310 is mainly used to collect the tail water discharged from the marine aquaculture pond 200, and remove solid particles such as feces and residual feed in the tail water by gravity sedimentation. The present application does not limit the shape and size of the sedimentation tank 310, which can be a square, rectangular, circular or polygonal tank body. In general, the sedimentation tank 310 can be an earthen pond covered with an impermeable cloth or a circular or square tank body cast by concrete.

[0038] In some specific embodiments, the hydrolysis acidification tank 320 mainly utilizes the action of anaerobic organisms to convert the COD in the tail water into Cr , BOD is oxidized into CO2, and organic phosphorus and protein in tail water and feces are hydrolyzed to release phosphate and ammonia nitrogen, which is beneficial to the subsequent further removal of phosphorus and nitrogen from tail water. The present application does not limit the shape and size of the hydrolysis acidification tank 320, which can be a square, rectangular, circular or polygonal tank body. Under normal circumstances, the hydrolysis acidification tank 320 can be an earthen pool covered with an impermeable cloth or a circular or square pool body cast by concrete. Furthermore, the water surface of the hydrolysis acidification tank 320 is arranged with a biological floating bed for growing aquatic plants.

[0039] In some specific embodiments, the filter 330 may be a fiber disk filter or a rotary microfilter. The filter cloth pore size of the filter 330 is preferably 5 to 20 μm, such as 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm or any value therebetween, which can ensure that 100% of the SS in the tail water is filtered and removed.

[0040] Furthermore, the special filler 342 for phosphorus adsorption is preferably at least one of a light iron hydroxide oxide special filler for phosphorus adsorption, a foamed light calcium silicate special filler for phosphorus adsorption, a foamed light aluminum silicate special filler for phosphorus adsorption, a foamed light calcium sulfate special filler for phosphorus adsorption, and a light zirconium hydroxide oxide special filler for phosphorus adsorption.

[0041] The phosphorus adsorption filler used in the present application can not only efficiently remove phosphorus from tail water by adsorption, but also reduce chromaticity. Specifically, the bulk density of the light iron oxyhydroxide phosphorus adsorption filler is preferably 200 to 400 kg / m 3 , such as 200kg / m 3 , 250kg / m 3 、300kg / m 3 、350kg / m 3 , 400kg / m 3 or any value therebetween; the adsorption capacity is preferably 1-3 kg / ton, such as 1 kg / ton, 1.5 kg / ton, 2 kg / ton, 2.5 kg / ton, 3 kg / ton or any value therebetween. The bulk density of the foamed light calcium silicate phosphate adsorption special filler is 400-550 kg / m 3 , such as 400kg / m 3 , 420kg / m 3 , 450kg / m 3 , 480kg / m 3 , 500kg / m 3 , 550kg / m 3 or any value therebetween; the adsorption capacity is preferably 12-15 kg / ton, such as 12 kg / ton, 13 kg / ton, 14 kg / ton, 15 kg / ton or any value therebetween. The bulk density of the foamed light aluminum silicate phosphorus adsorption special filler is 550-650 kg / m 3 , such as 550kg / m 3 、580kg / m 3 、600kg / m 3 、620kg / m 3 、650kg / m 3 or any value therebetween; the adsorption capacity is preferably 15-18 kg / ton, such as 15 kg / ton, 16 kg / ton, 17 kg / ton, 18 kg / ton or any value therebetween. The bulk density of the foamed light calcium sulfate phosphorus adsorption special filler is 410-530 kg / m 3 , such as 410kg / m 3 , 450kg / m 3 , 480kg / m 3 , 500kg / m 3 , 530kg / m 3 or any value therebetween; the adsorption capacity is preferably 25-28 kg / ton, such as 25 kg / ton, 16 kg / ton, 27 kg / ton, 28 kg / ton or any value therebetween. The bulk density of the lightweight zirconium oxyhydroxide phosphorus adsorption filler is 600-750 kg / m 3 , such as 600kg / m 3、620kg / m 3 、650kg / m 3 、680kg / m 3 , 700kg / m 3 、720kg / m 3 , 750kg / m 3 or any value therebetween; the adsorption capacity is preferably 25-32 kg / ton, such as 25 kg / ton, 28 kg / ton, 30 kg / ton, 32 kg / ton or any value therebetween. The thickness of the phosphorus adsorption special filler 342 is preferably 1-6 m, such as 1 m, 1.2 m, 1.5 m, 2 m, 3 m, 4 m, 5 m, 6 m or any value therebetween.

[0042] In addition, the phosphorus adsorption dedicated filler 342 can be replaced with a new filler after being saturated with adsorption, or the adsorbed phosphorus can be desorbed by regeneration and then continued to be used. The phosphorus adsorption dedicated filler can be regenerated by alkali washing and / or acid washing.

[0043] In some specific embodiments, the marine aquaculture tailwater treatment device may further include a catalytic electrolysis decolorization device. The water outlet of the adsorption dephosphorization and denitrification bed 340 is connected to the water inlet of the catalytic electrolysis decolorization device 350, which is used to remove ammonia nitrogen, total nitrogen and chromaticity in the tailwater, and includes a catalytic electrolyzer 351, a DC power supply 352 and a decolorization tank 353. The DC power supply 352 is used to provide electric energy to the catalytic electrolyzer 351, the water outlet of the adsorption dephosphorization and denitrification bed 340 is connected to the water inlet of the catalytic electrolyzer 351 on one way and to the water inlet 3531 of the decolorization tank 353 on the other way, the water outlet of the catalytic electrolyzer 351 is connected to the water inlet 3531 of the decolorization tank 353, the water inlet 3531 of the decolorization tank 353 is connected to the water distributor 3533 at the bottom of the decolorization tank 353, and the water outlet 3532 of the dewatering tank 353 meets the discharge standards. The effluent obtained after treatment by the adsorption dephosphorization and denitrification bed 340 can all enter the catalytic electrolyzer 351 for electrolysis treatment, or a part of it can enter the catalytic electrolyzer 351, and the other part can enter the decolorization tank 353 to mix with the effluent after catalytic electrolysis for decolorization treatment. This setting method can control the amount of water entering the catalytic electrolyzer 351 for treatment, and flexibly control the processing load of the catalytic electrolyzer 351, which is more conducive to the rational use and full play of the role of the catalytic electrolysis decolorization device 350.

[0044] In some specific embodiments, a regulating tank is provided on the pipeline connecting the water outlet of the adsorption dephosphorization and denitrification bed 340 and the water inlet of the catalytic electrolysis decolorization device 350, and the regulating tank is used to store the clean water that has been dephosphorized by the adsorption dephosphorization and denitrification bed 340. The water inlet of the regulating tank is connected to the water outlet of the adsorption dephosphorization and denitrification bed 340, and the water outlet of the regulating tank is connected to the water inlet of the catalytic electrolyzer 351 on one side and to the water inlet 3541 of the decolorization tank 353 on the other side.

[0045] In some specific embodiments, see Figure 5 The catalytic electrolysis decolorization device 350 includes a pickling device 354, which includes a pickling solution storage tank 3541 and a pickling solution delivery pump 3542. The outlet of the pickling solution storage tank 3541 is connected to the water outlet of the catalytic electrolyzer 351 and the pickling solution delivery pump 3542 is arranged on the connecting pipeline between the two. The inlet of the pickling solution storage tank 3541 is connected to the water inlet of the catalytic electrolyzer 351. The setting of the pickling device 354 can regularly clean and wash the electrode sheet in the catalytic electrolyzer 351, which is more conducive to ensuring that the catalytic electrolysis reaction therein runs smoothly and efficiently. More specifically, when the electrolysis efficiency of the electrode in the catalytic electrolyzer 351 decreases, the catalytic electrolyzer 351 is stopped, and the pickling solution delivery pump 3542 is started to introduce the pickling solution in the pickling solution storage tank 3541 into the catalytic electrolyzer 351 to remove the scale deposited on the electrode surface. The pickling solution may be a 2-3% hydrochloric acid solution or a 4-5% citric acid solution.

[0046] In some specific embodiments, the marine aquaculture tailwater treatment device may further include a sludge treatment device. The sludge treatment device 360 ​​includes a sludge concentration tank, a physical and chemical adjustment tank, a sludge dewatering machine and a sludge tank connected in sequence, the inlet of the sludge concentration tank is connected to the sludge discharge port of the sedimentation tank 310 and the hydrolysis acidification tank 320 via a sludge pump, the outlet of the sludge dewatering machine is discharged to the outside when the water meets the standard or is connected to the water inlet of the sedimentation tank 310, and the sludge discharge port of the sludge dewatering machine is connected to the sludge tank. The sludge discharged from the sedimentation tank 310 and the hydrolysis acidification tank 320 first enters the sludge thickening tank for the first dehydration treatment through the sludge pump. The resulting wastewater can be returned to the sedimentation tank 310. The concentrated sludge enters the physical and chemical adjustment tank to improve its dewaterability by adjusting the physical and chemical properties of the sludge. The sludge after physical and chemical adjustment enters the sludge dewatering machine for dehydration treatment. The dehydrated sludge is collected and placed in a sludge tank and can be transported out regularly. If the effluent of the sludge dewatering machine meets the standards, it is connected to the outside for discharge. If it does not meet the standards, it is returned to the sedimentation tank 310 for further treatment.

[0047] Furthermore, the sludge thickening tank is preferably a gravity thickening tank, which includes an upper clear liquid zone and a lower sludge thickening zone, the outlet of the upper clear liquid zone is connected to the water inlet of the sedimentation tank 310, and the outlet of the lower sludge thickening zone is connected to the inlet of the physical and chemical adjustment tank. The sludge dewatering machine can be a conventional sludge dewatering machine used in wastewater treatment, which can be but is not limited to: at least one of a plate and frame sludge dewatering machine, a belt sludge dewatering machine, a sludge centrifugal dewatering machine, a stacked sludge dewatering machine and a screw press dewatering machine.

[0048] In some specific embodiments, the water inlet of the marine aquaculture tailwater treatment device 300 is installed with at least one of the online monitors of COD, ammonia nitrogen, total nitrogen and total phosphorus, and the water outlet is installed with at least one of the online monitors of residual chlorine, COD, ammonia nitrogen, total nitrogen and total phosphorus.

[0049] In addition, when the fishery-light-pollution complementary mariculture system and / or the mariculture tailwater treatment device 300 provided in the present application is used to purify mariculture tailwater, the treatment method may specifically include the following steps:

[0050] S1. Sedimentation and biochemical treatment: The tail water of aquaculture enters the sedimentation tank 310 and the hydrolysis and acidification tank 320. The solid particles such as feces and residual feed in the tail water are first precipitated and removed by gravity in the sedimentation tank 310, and then enter the hydrolysis and acidification tank 320 for treatment. The COD in the tail water is mainly reduced by anaerobic organisms. Cr , BOD is oxidized into CO2, organic phosphorus is converted into inorganic phosphate, protein is hydrolyzed and acidified into ammonia nitrogen, and then the effluent enters the filter;

[0051] S2. Filtration treatment: The effluent after the sedimentation and biochemical treatment is lifted to the filter 330 by overflow or by a lifting pump, and the tail water is filtered and separated to obtain 90-95 v / v% of clean water and 5-10 v / v% of concentrated water. The clean water is subjected to subsequent adsorption and phosphorus removal treatment, and the concentrated water is returned to the sedimentation tank 310;

[0052] S3. Adsorption phosphorus removal and denitrification treatment: The clean water obtained by filtration in step S2 enters the adsorption phosphorus removal and denitrification bed 340 and aeration is started. The clean water flows out from the top to the bottom. The total nitrogen in the clean water is removed by biochemical reaction under aeration conditions, and the phosphate anions in the clean water are adsorbed and removed from the water body by the special filler for phosphorus adsorption. The clean water after phosphorus removal and denitrification passes through the outlet and the outlet valve and is measured by the flow meter and then discharged through the drain outlet. Among them, the total phosphorus in the clean water after phosphorus removal is ≤0.3mg / L, and the phosphorus removal rate is 90-99.8%, and the total nitrogen is ≤5mg / L, and the total nitrogen removal rate is 50-60%;

[0053] S4. Sludge treatment: The sludge obtained from the sedimentation tank 310 and the hydrolysis acidification tank 320 is transported to the sludge treatment device 360 ​​for dehydration treatment to obtain a filtrate and dehydrated sludge. The filtrate is returned to the sedimentation tank 310, and the dehydrated sludge is discharged.

[0054] Furthermore, the retention time of the sedimentation tank 310 is preferably 2 to 4 hours, such as 2, 2.5, 3, 3.5, 4 hours or any value therebetween. The treatment time of the hydrolysis acidification tank 320 is preferably 2 to 6 hours, such as 2, 3, 4, 5, 6 hours or any value therebetween.

[0055] Furthermore, after the step S3 of adsorption dephosphorization and denitrification treatment, the step S5 of electrolytic denitrification and decolorization treatment is also included: a part of the clean water obtained by the step S3 of adsorption dephosphorization is pumped into the catalytic electrolysis machine 351, and enters the decolorization tank after electrolysis; at the same time, another part of the clean water obtained by the adsorption dephosphorization is directly pumped into the decolorization tank 353, and this part of the clean water is mixed with the clean water after catalytic electrolysis entering the decolorization tank 353 to decolorize the water body and meet the discharge standards.

[0056] In some specific embodiments, in step S5, in the decolorization tank 353, the volume ratio of the clean water after catalytic electrolysis to the clean water after adsorption dephosphorization and denitrification is preferably 1: (0-10), such as 1: 8, 1: 8.2, 1: 8.5, 1: 8.8, 1: 9 or any value therebetween. At this time, the amount of water entering the catalytic electrolyzer 351 for treatment can be controlled, and the treatment load of the catalytic electrolyzer 351 can be flexibly adjusted, so as to be more conducive to the rational use and full play of the role of the catalytic electrolysis decolorization device 350.

[0057] Furthermore, the operating voltage of the catalytic electrolysis decolorization device 350 is preferably 5-100V, such as 5V, 10V, 20V, 50V, 80V, 100V or any value therebetween; the operating current is 10-2000A, such as 10A, 100A, 500A, 800A, 1000A, 1500A, 2000A or any value therebetween.

[0058] The fishery-light-pollution complementary marine aquaculture system provided by the present application and the method for treating marine aquaculture tailwater using the system will be described in detail below through specific embodiments.

[0059] Example 1 Fish-light-pollution complementary marine aquaculture system and method, with a daily processing capacity of 2000 tons / day

[0060] (1) See Figures 1 to 5 The fishery-light-pollution complementary marine aquaculture system provided in this embodiment includes a photovoltaic power generation device 100, a marine aquaculture pond 200 and a marine aquaculture tailwater treatment device 300, wherein:

[0061] The photovoltaic power generation device 100 includes a photovoltaic bracket, a plurality of solar panels, a junction box, an inverter and a booster station. It is arranged in the upper space of the marine aquaculture pond 200 and the marine aquaculture tailwater treatment device 300 through the photovoltaic bracket. The photovoltaic power generation device 100 consists of 1334 solar panels with a specification of 2045×1038×35mm and a single-piece power generation capacity of 560w. The total installed power is 747kW. The solar panels convert light energy into electrical energy, which is collected by the junction box and then enters the inverter to be converted into alternating current. The electrical appliances (agitators, pumps, etc.) in the fishery-light-pollution complementary marine aquaculture system are supplied preferentially. The excess electric energy is boosted by the booster station and then connected to the power grid to obtain income.

[0062] The marine aquaculture pond 200 is composed of three shrimp ponds of 30×25×1.8 m, in which whiteleg shrimp are cultured. The aquaculture tail water produced enters the aquaculture tail water treatment device 300 for treatment.

[0063] The marine aquaculture tailwater treatment device 300 includes a sedimentation tank 310, a hydrolysis acidification tank 320, a filter 330, an adsorption dephosphorization and denitrification bed 340, a regulating tank, a catalytic electrolysis decolorization device 350 and a sludge treatment device 360 ​​which are connected in sequence.

[0064] Sedimentation tank 310 is a circular concrete casting tank with a diameter of 13m, a depth of 2m, and a designed retention time of 3h. It is used to collect and precipitate tail water discharged from the cultivation of white shrimp and to precipitate and remove solid particles such as feces and residual feed in the tail water. Hydrolysis acidification tank 320 is a circular concrete casting tank with a diameter of 13m, a depth of 2m, and a designed treatment time of 3h. It uses anaerobic organisms to remove COD in the tail water. Cr , oxidizing BOD into CO2, and hydrolyzing and releasing organic phosphorus proteins in tail water and feces. The filter 330 uses a rotary microfilter with a filter mesh size of 5 μm, filtering to obtain 90 v / v% clean water and 10 v / v% concentrated water.

[0065] The adsorption dephosphorization and denitrification bed 340 includes a filter adsorption tank 341, an aeration pipe, a filter brick, a phosphorus adsorption special filler 342, a cover plate 343 and green plants 345 above the cover plate. The filter adsorption tank 341 is a square concrete casting tank with a geometric size of 12m×12×1.5m; the phosphorus adsorption special filler 342 is a light iron oxyhydroxide phosphorus adsorption special filler, and the stacking density is preferably 310kg / m 3 , the adsorption capacity is 1kg / ton, and the packing thickness is 1.5m. The geometric dimensions of the regulating tank are 5m×5×1.5m, and it is used to store the clean water that has been dephosphorized by the adsorption dephosphorization and denitrification bed 340. One of the outlets of the regulating tank is connected to the water inlet of the catalytic electrolyzer 351 and the other is connected to the water inlet 3541 of the decolorization tank 353.

[0066] The catalytic electrolysis decolorization device 350 includes a catalytic electrolyzer 351, a DC power supply 352, a decolorization tank 353 and a pickling device 354. The water inlet of the catalytic electrolyzer 351 is connected to the water outlet of the regulating tank, the water outlet of the catalytic electrolyzer 351 is connected to the water inlet 3531 of the decolorization tank 353, the water inlet 3531 of the color tank 353 is connected to the water distributor 3533 at the bottom of the decolorization tank 353, and the water outlet 3532 of the decolorization tank 353 meets the discharge standards; the pickling device 354 includes a pickling solution storage tank 3541 and a pickling solution delivery pump 3542, the outlet of the pickling solution storage tank 3541 is connected to the water outlet of the catalytic electrolyzer 351 and the pickling solution delivery pump 3542 is arranged on the connecting pipeline between the two, and the inlet of the pickling solution storage tank 3541 is connected to the water inlet of the catalytic electrolyzer 351. Among them, the pickling solution adopts a 2-3% hydrochloric acid solution.

[0067] The sludge treatment device 360 ​​includes a sludge thickening tank, a physical and chemical adjustment tank, a plate and frame sludge dewatering machine and a sludge tank which are connected in sequence.

[0068] The water quality of the marine aquaculture tail water to be treated is shown in Table 1.

[0069] Table 1 Influent water quality indicators

[0070]

[0071]

[0072] (2) The tailwater purification method of the fishery-light-pollution complementary marine aquaculture system adopted in this embodiment is carried out in the above-mentioned fishery-light-pollution complementary marine aquaculture system, comprising the following steps:

[0073] S1. Sedimentation and biochemical treatment: The shrimp farming tailwater is discharged into the sedimentation tank 310 and the hydrolysis acidification tank 320 at a flow rate of 84 tons / hour. The feces, residual feed and other solid particles in the tailwater are first precipitated and removed by gravity in the sedimentation tank 310, and then the tailwater is treated in the hydrolysis acidification tank 320 for 3 hours. The COD in the tailwater is reduced by anaerobic organisms. Cr , BOD is oxidized into CO2, organic phosphorus is converted into inorganic phosphate, protein is hydrolyzed and acidified into ammonia nitrogen, and then the effluent enters the filter 330;

[0074] S2. Filtration treatment: The effluent after the sedimentation and biochemical treatment is lifted to the filter 330 by the lifting pump, and the tail water is filtered and separated to obtain 90v / v% of clean water (76 tons / hour) and 10v / v% of concentrated water (8 tons / hour). The clean water enters the intermediate water tank, and the concentrated water flows back to the sedimentation tank 310;

[0075] S3. Adsorption phosphorus removal and denitrification treatment: the clean water obtained by the filter 330 enters the adsorption phosphorus removal and denitrification bed 340 and starts aeration. The clean water flows out from the top to the bottom. The total nitrogen in the clean water is removed by biochemical reaction under aeration conditions, and the phosphate anions in the clean water are adsorbed and removed from the water body by the special filler for phosphorus adsorption. The clean water after phosphorus removal and denitrification passes through the outlet and the outlet valve and is measured by the flow meter and then discharged through the drain outlet. Among them, the total phosphorus in the clean water after phosphorus removal is ≤0.1mg / L, and the phosphorus removal rate is 90-99.8%, and the total nitrogen is ≤5mg / L, and the total nitrogen removal rate is 50-60%;

[0076] S4. Electrolytic denitrification and decolorization: A portion of the clean water (8 tons / hour) obtained by adsorption and dephosphorization in the regulating tank is pumped into the catalytic electrolyzer 351, and enters the decolorization tank 353 after electrolysis. The working voltage of the catalytic electrolyzer 351 is 28V and the working current is 200A; at the same time, another portion of the clean water (70 tons / hour) obtained by adsorption and dephosphorization is directly pumped into the decolorization tank 353, and this portion of clean water is mixed with the clean water after catalytic electrolysis entering the decolorization tank 353 to decolorize the water body and meet the water quality standards. The effluent water quality is shown in Table 2, and specifically meets the following indicators: COD Cr ≤10mg / L, BOD5≤3mg / L, ammonia nitrogen≤1mg / L, total nitrogen≤5mg / L, total phosphorus≤0.3mg / L, SS≤10mg / L, chromaticity less than 5, pH=8, meeting the discharge standard;

[0077] S5. Sludge treatment: The sludge obtained from the sedimentation tank 310 and the hydrolysis acidification tank 320 is transported to the sludge treatment device 360 ​​for dehydration treatment to obtain a filtrate and dehydrated sludge. The filtrate is returned to the sedimentation tank 310, and the dehydrated sludge is discharged.

[0078] Table 2 Outlet water quality indicators

[0079] Serial number project unit Measured value Serial number project unit Measured value 1 <![CDATA[COD Cr ]]> mg / L 10 5 Ammonia nitrogen mg / L 1 2 <![CDATA[BOD5]]> mg / L 3 6 Total Nitrogen mg / L 3.8 3 SS mg / L 10 7 Chroma times 5 4 Total Phosphorus mg / L 0.30 8 pH 8.0

[0080] Example 2: Fish-light-pollution complementary marine aquaculture system and method, with a daily processing capacity of 10,000 tons / day

[0081] (1) This embodiment provides a fishery-light-pollution complementary aquaculture system, which is basically the same as the fishery-light-pollution complementary aquaculture system provided in Example 1, except that: there is no catalytic electrolysis decolorization device 350; the sedimentation tank 310 is a rectangular concrete casting tank body, 42m long, 11m wide, 1.8m deep, and the designed residence time is 2h; the hydrolysis acidification tank 320 is a rectangular concrete casting tank body, 42m long, 22m wide, 1.8m deep, and the designed treatment time is 4h; the filter 330 adopts a fiber rotary filter, the filter cloth pore size is 20μm, and 95v / v% of clean water and 5v / v% of concentrated water are filtered; the filter adsorption tank 341 is a square concrete casting tank body, the geometric size is 42m×11m, and the tank depth is 1.8m; the phosphorus adsorption special filler 342 is a foamed light calcium silicate phosphorus adsorption special filler, and the stacking density is preferably 500kg / m 3 The adsorption capacity is 14kg / ton and the filler thickness is 1.8m.

[0082] (2) This embodiment provides a method for purifying tail water of a fishery, light and pollution complementary aquaculture system. The method is carried out in the fishery, light and pollution complementary aquaculture system provided in this embodiment, and is basically the same as the method and steps provided in Example 1, except that: the tail water is filtered and separated to obtain 95v / v% clean water (396 tons / hour) and 5v / v% concentrated water (21 tons / hour); the effluent treated by adsorption dephosphorization and denitrification in step S3 is directly discharged in compliance with the standards.

[0083] The water quality of the inlet and outlet water of the mariculture tail water to be treated is shown in Table 3 and Table 4. The effluent water quality after purification by the fishery-light-pollution complementary mariculture system meets the following indicators: COD Cr ≤10mg / L, BOD5≤3mg / L, ammonia nitrogen≤1mg / L, total nitrogen≤5mg / L, total phosphorus≤0.5mg / L, SS≤10mg / L, chromaticity less than 10, meeting the emission standards.

[0084] Table 3 Influent water quality indicators

[0085] Serial number project unit Measured value Serial number project unit Measured value 1 <![CDATA[COD Cr ]]> mg / L 16 5 Ammonia nitrogen mg / L 3.5 2 <![CDATA[BOD5]]> mg / L 7 6 Total Nitrogen mg / L 4.2 3 SS mg / L 150 7 Chroma times 80 4 Total Phosphorus mg / L 1.44 8 pH 8.5

[0086] Table 4 Outlet water quality indicators

[0087] Serial number project unit Measured value Serial number project unit Measured value 1 <![CDATA[COD Cr ]]> mg / L 8 5 Ammonia nitrogen mg / L 1 2 <![CDATA[BOD5]]> mg / L 2 6 Total Nitrogen mg / L 3 3 SS mg / L 8 7 Chroma times 5 4 Total Phosphorus mg / L 0.23 8 pH 8.4

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application without departing from the principles and purpose of the present application.

Claims

1. A fishery, light and pollution complementary marine aquaculture system, characterized in that: The fishery-light-pollution complementary marine aquaculture system comprises a photovoltaic power generation device, a marine aquaculture pond and a marine aquaculture tailwater treatment device, wherein: The photovoltaic power generation device is located in the upper space of the marine aquaculture pond and the marine aquaculture tailwater treatment device, and is used to generate electricity and supply power using solar energy; the photovoltaic power generation device includes a photovoltaic bracket, a plurality of solar panels, a junction box, an inverter and a booster station, and the output end of the inverter is connected to the electrical appliances of the fishery-light-pollution complementary marine aquaculture system on one side to provide power to the electrical appliances, and is connected to the power grid through the booster station on the other side to supply power to the power grid; The marine aquaculture tailwater treatment device is used for purifying and treating aquaculture tailwater, and comprises a sedimentation tank, a hydrolysis acidification tank, a filter, and an adsorption phosphorus removal and denitrification bed which are connected in sequence. The tailwater outlet of the marine aquaculture tank is connected to the water inlet of the sedimentation tank, the water outlet of the sedimentation tank is connected to the water inlet of the hydrolysis acidification tank, the water outlet of the hydrolysis acidification tank is connected to the water inlet of the filter, the clean water outlet of the filter is connected to the water inlet of the adsorption phosphorus removal and denitrification bed, the concentrated water outlet of the filter is connected to the water inlet of the sedimentation tank, and the water outlet of the adsorption phosphorus removal and denitrification bed is connected to the drain; the adsorption phosphorus removal and denitrification bed comprises a filter adsorption tank, an aeration pipe and a special filler for phosphorus adsorption, the aeration pipe is arranged at the bottom of the filter adsorption tank, and the special filler for phosphorus adsorption is filled above the filter brick.

2. The fishery-light-pollution complementary marine aquaculture system according to claim 1 is characterized in that: The filter is a fiber rotary disc filter or a rotary microfilter.

3. The fishery-light-pollution complementary marine aquaculture system according to claim 1, characterized in that: The filter cloth pore size of the filter is 5 to 20 μm.

4. The fishery-light-pollution complementary marine aquaculture system according to claim 1, characterized in that: The special filler for phosphorus adsorption is selected from at least one of light iron oxyhydroxide special filler for phosphorus adsorption, foamed light calcium silicate special filler for phosphorus adsorption, foamed light aluminum silicate special filler for phosphorus adsorption, foamed light calcium sulfate special filler for phosphorus adsorption, and light zirconium oxyhydroxide special filler for phosphorus adsorption.

5. The fishery-light-pollution complementary marine aquaculture system according to claim 1, characterized in that: The thickness of the special filler for phosphorus adsorption is 1 to 6 μm.

6. The fishery-light-pollution complementary marine aquaculture system according to claim 1, characterized in that: The marine aquaculture tailwater treatment device also includes a catalytic electrolysis decolorization device; The catalytic electrolysis decolorization device includes a catalytic electrolyzer, a DC power supply and a decolorization tank. The water outlet of the adsorption dephosphorization and denitrification bed is connected to the water inlet of the catalytic electrolyzer on one side and to the water inlet of the decolorization tank on the other side. The water outlet of the catalytic electrolyzer is connected to the water inlet of the decolorization tank, and the water outlet of the decolorization tank is connected to a drain.

7. The fishery-light-pollution complementary marine aquaculture system according to claim 6, characterized in that: A regulating tank is provided on the pipeline connecting the water outlet of the adsorption dephosphorization and denitrification bed and the water inlet of the catalytic electrolyzer. The water inlet of the regulating tank is connected to the water outlet of the adsorption dephosphorization and denitrification bed. One way of the water outlet of the regulating tank is connected to the water inlet of the catalytic electrolyzer and the other way is connected to the water inlet of the decolorization tank.

8. The fishery-light-pollution complementary marine aquaculture system according to claim 6, characterized in that: The catalytic electrolysis decolorization device includes a pickling device, which includes a pickling solution storage tank and a pickling solution delivery pump. The outlet of the pickling solution storage tank is connected to the water outlet of the catalytic electrolyzer and the pickling solution delivery pump is arranged on the connecting pipeline between the two. The inlet of the pickling solution storage tank is connected to the water inlet of the catalytic electrolyzer.

9. The fishery-light-pollution complementary marine aquaculture system according to claim 1, characterized in that: The marine aquaculture tailwater treatment device also includes a sludge treatment device, which includes a sludge pump, a sludge thickening tank, a physical and chemical adjustment tank, a sludge dewatering machine and a sludge tank connected in sequence, the inlet of the sludge thickening tank is connected to the sludge discharge ports of the sedimentation tank and the hydrolysis acidification tank via the sludge pump, the outlet of the sludge dewatering machine is discharged externally in compliance with the standards or is connected to the water inlet of the sedimentation tank, and the sludge discharge port of the sludge dewatering machine is connected to the sludge tank.

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