Integrated aquaculture tail water treatment equipment and method

Abstract

The invention discloses integrated aquaculture tail water treatment equipment and method, and belongs to the technical field of aquaculture tail water treatment. The interior of the box body is divided into a plurality of units by partition plates, and a primary filtering self-cleaning unit, a secondary filtering and disinfecting unit, a composite biological membrane treatment unit, a deep physical-biological filtering unit and a modular composite adsorption unit are sequentially arranged in the flowing direction of a water body; the primary filtering self-cleaning unit is used for primarily filtering tail water; the secondary filtering and disinfecting unit is used for disinfecting and further filtering the water body; the composite biological membrane treatment unit is used for treating a water body by utilizing a nitrification-denitrification composite microbial membrane; the deep physical-biological filtering unit is used for treating a water body by utilizing a rattan cotton filtering medium which is stacked in a multi-layer manner; the modularized composite adsorption unit is used for adsorbing a water body. The system has the advantages of high integration, intelligent self-control, convenient maintenance, stable operation and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aquaculture tail water treatment, and relates to an aquaculture tail water treatment device and method, in particular to an integrated aquaculture tail water treatment device and method. BACKGROUND

[0002] With the development of aquaculture industry towards intensification and high density, the pollutants such as residual feed, feces, ammonia nitrogen, nitrite, suspended solids and pathogenic microorganisms in the aquaculture tail water have become an important source of non-point source pollution. Achieving standard discharge or recycling of aquaculture tail water is an inevitable requirement for sustainable development of the industry.

[0003] Currently, the treatment technology for aquaculture tail water mainly focuses on physical filtration, biological treatment and advanced purification, and there are many related devices and methods, but there are still common problems such as low integration, poor impact resistance, and complicated operation and maintenance. For example, in the aspect of physical filtration, the patent application with publication number CN112047495A discloses a drum-type microfilter which can effectively remove suspended solids, but the device has single function and needs to be connected with other biological treatment units in sequence, resulting in large system occupation and complex pipeline. The patent application with publication number CN115072989A attempts to integrate multiple functions in one body, but the units are only simply stacked, lacking of collaborative design of water flow state and pollutant flow removal, and the pain points of easy clogging of microfilter screen and frequent manual cleaning are not solved. In the aspect of biological treatment, the patent application with publication number CN114477379A relates to a moving bed biological membrane reactor (MBBR), which has large biomass, but the filler is easy to be lost, the power consumption is high, and the denitrification efficiency for low C / N ratio aquaculture tail water is limited. The patent application with publication number CN113233659A uses bacterial agent and biological flocculation technology, but the effect is significantly affected by water temperature and pH fluctuation, the bacterial agent supplement cost is high, and the operation stability is insufficient. In terms of intelligent control and maintenance convenience, most of the existing devices have low automation degree. The patent application with publication number CN116002844A discloses a treatment system with monitoring function, but the monitoring and control linkage is insufficient, and the process parameter adaptive adjustment based on water quality feedback cannot be realized. In addition, most of the devices need to be stopped and emptied when replacing the adsorption filter material (such as activated carbon and zeolite), which is inconvenient and affects continuous operation. SUMMARY

[0004] The present application provides an integrated aquaculture tail water treatment device and method to overcome the defects of the prior art.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: In a first aspect, the present application provides an integrated aquaculture tail water treatment device, comprising a box; the box is divided into multiple units by a partition fixed therein, and arranged in sequence along the water flow direction as a primary filtration self-cleaning unit, a secondary filtration disinfection unit, a composite biofilm treatment unit, a deep physical-biological filtration unit and a modular composite adsorption unit; the primary filtration self-cleaning unit is used for primary filtration of tail water, and can use the treated water to clean the filtration structure; the secondary filtration disinfection unit is used for disinfection and further filtration of the water treated by the primary filtration self-cleaning unit; the composite biofilm treatment unit uses nitrification-denitrification composite microbial membrane to treat the water treated by the secondary filtration disinfection unit; the deep physical-biological filtration unit uses multiple layers of stacked rattan cotton filter medium to treat the water treated by the composite biofilm treatment unit; the modular composite adsorption unit adsorbs the water treated by the deep physical-biological filtration unit; the box is provided with a device water inlet on one side of the primary filtration self-cleaning unit and a device water outlet on one side of the modular composite adsorption unit, and the partition is provided with unit water inlets and outlets for communicating adjacent units.

[0006] To optimize the above technical solution, the specific measures taken further include: Further, the primary filtration self-cleaning unit and the secondary filtration disinfection unit each comprise a water storage plate, a water distribution pipe and a rotary drum microfilter; the water storage plate is fixed in the corresponding unit to form a water storage groove with the side wall of the unit water inlet; the water distribution pipe and the rotary drum microfilter are arranged on the side of the water storage plate away from the unit water inlet; the rotary shaft of the rotary drum microfilter is arranged transversely; the water distribution pipe is arranged on one side of the rotary drum microfilter, and the water spray hole faces the filter screen of the rotary drum microfilter; the water distribution pipe is connected with the water storage groove to be able to draw the water in the water storage groove to spray to the rotary drum microfilter for filtration; the unit water inlets and outlets between the primary filtration self-cleaning unit and the secondary filtration disinfection unit and between the secondary filtration disinfection unit and the composite biofilm treatment unit are arranged at positions inside the rotary drum of the rotary drum microfilter; the mesh size of the rotary drum screen of the rotary drum microfilter of the primary filtration self-cleaning unit is larger than that of the rotary drum microfilter of the secondary filtration disinfection unit.

[0007] Further, the water distribution pipe is further connected with the device water outlet to be able to spray the treated water to the rotary drum microfilter for self-cleaning; the primary filtration self-cleaning unit and the secondary filtration disinfection unit each further comprise a liquid level sensor; the liquid level sensor is used to monitor the liquid level outside the rotary drum microfilter; when the liquid level outside the rotary drum microfilter is higher than the rotary shaft, the rotary drum is self-cleaned, and the suspended solids on the outer surface of the rotary drum are washed to the bottom of the unit and discharged from the sludge discharge port.

[0008] Further, the secondary filtration disinfection unit is further provided with an ultraviolet disinfection lamp.

[0009] Further, the overflow tank is arranged on the partition plate between the secondary filtration and disinfection unit and the composite biofilm treatment unit, and the overflow tank is arranged above the rotary drum of the rotary drum microfilter.

[0010] Further, the curved surface brush is arranged in the composite biofilm treatment unit in a three-dimensional netted distribution, and the nitrification-denitrification composite microbial film is loaded on the surface of the curved surface brush; the nitrification-denitrification composite microbial film comprises a low-temperature resistant bactericide subjected to immobilization treatment; and the composite biofilm treatment unit is further provided with an aeration device.

[0011] Further, in the deep physical-biological filtration unit, the multiple layers of stacked rattan cotton filtration media are arranged in parallel with a spacing of 8-15 cm, and the total number of layers is 8-12.

[0012] Further, the modular composite adsorption unit is sequentially provided with a volcanic rock filter material module, a zeolite filter material module and an activated carbon filter material module along the water flow direction, and the volcanic rock filter material module, the zeolite filter material module and the activated carbon filter material module are all module structures filled with filter materials through a netted packaging bag.

[0013] Further, the composite biofilm treatment unit, the deep physical-biological filtration unit and the modular composite adsorption unit form an alternating baffle type water flow path through the water inlet and outlet of the corresponding units and the water outlet of the equipment.

[0014] Further, the water quality online monitoring unit is used for monitoring the water quality data of the treated water body discharged from the water outlet of the equipment, including ammonia nitrogen, nitrite, pH, dissolved oxygen, turbidity and other key water quality parameters; the control unit is connected with the water quality online monitoring unit and the liquid level sensor signals of the primary filtration and self-cleaning unit and the secondary filtration and disinfection unit; when the water quality online monitoring module detects that the treated water body does not meet the standard, the residence time of the water body in the equipment is prolonged, and the irradiation dose of the ultraviolet disinfection lamp is increased; when the liquid level sensor detects that the liquid level is higher than the corresponding rotating shaft of the rotary drum microfilter, the water distribution pipe extracts the treated water body and sprays it to the corresponding rotary drum microfilter for self-cleaning.

[0015] In a second aspect, the present application also provides a method for treating aquaculture tail water by the above-mentioned device: pumping the tail water into the primary filtration self-cleaning unit, performing primary filtration by the rotary drum microfilter, and performing self-cleaning of the rotary drum microfilter when the liquid level sensor detects that the liquid level is higher than the rotating shaft of the rotary drum microfilter; the water after primary filtration enters the secondary filtration and disinfection unit, performs secondary filtration by the rotary drum microfilter, and receives ultraviolet disinfection by the ultraviolet disinfection lamp, and performs self-cleaning of the rotary drum microfilter when the liquid level sensor detects that the liquid level is higher than the rotating shaft of the rotary drum microfilter; the water after secondary filtration enters the composite biological membrane treatment unit, performs nitrification and denitrification reactions by the nitrification-denitrification composite microbial membrane to remove ammonia nitrogen, nitrite and organic pollutants in the water; the reacted water enters the deep physical-biological filtration unit, performs deep filtration and attached biological degradation by the multiple layers of stacked rattan cotton filter medium; the water after deep filtration enters the modular composite adsorption unit, sequentially passes through volcanic rock, zeolite and activated carbon for adsorption, and further stabilizes the water quality and removes residual pollutants; and the adsorbed water is discharged from the device outlet.

[0016] The treated water that meets the standard can be discharged or reused for self-cleaning, and the water that does not meet the standard can re-enter the device for re-treatment. The entire treatment process is automatically operated, managed and optimized by the control unit based on the monitoring data of the water quality online monitoring unit and the liquid level sensors of the primary filtration self-cleaning unit and the secondary filtration and disinfection unit.

[0017] The present application has the following advantages: I. High integration, small footprint. The present application integrates five core treatment units, with a footprint of only 3.8-6.3 square meters, reducing the footprint by 60-80% compared to traditional split systems, greatly reducing the cost of infrastructure and civil construction for small and medium-sized farms, and adapting to limited space scenarios.

[0018] II. Multi-stage cooperation, efficient purification. The present application uses a "physical filtration-biochemical degradation-adsorption purification" cascade process to cooperatively remove suspended solids, organic matter, ammonia nitrogen and other pollutants. Experimental verification shows that the ammonia nitrogen removal rate is 85-95%, the total phosphorus removal rate is 75%-85%, and the suspended solids removal rate is 90%-95%, and the effluent meets the "Pond Aquaculture Tail Water Discharge Standard" (DB32 / 4043-2021), which can be directly discharged, meeting the needs of green recycling.

[0019] III. Intelligent and convenient, strong adaptability. Equipped with liquid level sensor, water quality online monitoring unit and control unit, realize automatic spray washing of drum, parameter self-adaptive adjustment, without manual intervention; filter material independent small package design, modular quick change, solve the problem of traditional equipment maintenance cumbersome. The equipment processing capacity is 8~12 tons / day adjustable, strong impact load resistance, suitable for different scale farms, the total investment is reduced by 30~50% compared with traditional system, with economy and practicality. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a front view structural schematic diagram of the integrated aquaculture tail water treatment equipment; Figure 2 is a top view structural schematic diagram of the integrated aquaculture tail water treatment equipment; Figure 3 is a process flow diagram of the aquaculture tail water treatment; The marks in the drawings are: 1, box; 11, equipment water inlet; 12, equipment water outlet; 2, partition; 21, unit water inlet and outlet; 3, primary filtration self-cleaning unit; 31, water storage plate; 32, water distribution pipe; 33, drum type microfilter; 34, water storage tank; 4, secondary filtration and disinfection unit; 5, composite biological membrane treatment unit; 51, curved surface brush; 6, deep physical-biological filtration unit; 61, rattan cotton filter medium; 7, modular composite adsorption unit; 71, filter material module; 72, grid; 8, control unit. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application are described below in conjunction with the drawings.

[0022] As shown in Figure 1 and Figure 2 , the present application provides an integrated aquaculture tail water treatment equipment, which comprises a box 1. The box 1 is divided into multiple units by the partition 2 fixed thereto, and the units are sequentially arranged along the direction of water flow as the primary filtration self-cleaning unit 3, the secondary filtration and disinfection unit 4, the composite biological membrane treatment unit 5, the deep physical-biological filtration unit 6 and the modular composite adsorption unit 7.

[0023] The primary filtration self-cleaning unit 3 is used for primary filtration of tail water and can use the water treated by the device to clean the filtration structure. The secondary filtration disinfection unit 4 is used for disinfection and further filtration of the water treated by the primary filtration self-cleaning unit 3. The composite biofilm treatment unit 5 uses a nitrification-denitrification composite microbial membrane to treat the water treated by the secondary filtration disinfection unit 4, converts ammonia nitrogen into nitrite and nitrate by nitrifying bacteria, and then reduces the nitrate into nitrogen by denitrifying bacteria to achieve efficient nitrogen and phosphorus removal. The deep physical-biological filtration unit 6 uses a plurality of stacked rattan cotton filtration media 61 to treat the water treated by the composite biofilm treatment unit 5, and the porous structure of the rattan cotton can realize the dual treatment of physical interception and microbial attachment and degradation of small particles. The modular composite adsorption unit 7 adsorbs the water treated by the deep physical-biological filtration unit 6.

[0024] The box 1 is provided with a device water inlet 11 on one side of the primary filtration self-cleaning unit 3 and a device water outlet 12 on one side of the modular composite adsorption unit 7, and the partition plate 2 is provided with a unit water inlet and outlet 21 communicating adjacent units.

[0025] The primary filtration self-cleaning unit 3 and the secondary filtration disinfection unit 4 each include a water storage plate 31, a water distribution pipe 32, and a rotary drum microfilter 33. The water storage plate 31 is fixed in the corresponding unit and forms a water storage groove 34 with the side wall of the unit water inlet. The water distribution pipe 32 and the rotary drum microfilter 33 are arranged on the side of the water storage plate 31 away from the unit water inlet. The rotary shaft of the rotary drum microfilter 33 is arranged transversely. The water distribution pipe 32 is arranged on one side of the rotary drum microfilter 33, and the water spray hole faces the filter screen of the rotary drum microfilter 33. The water distribution pipe 32 is connected with the water storage groove 34 and can draw water in the water storage groove 34 to spray it to the rotary drum microfilter 33 for filtration. The unit water inlet and outlet 21 between the primary filtration self-cleaning unit 3 and the secondary filtration disinfection unit 4 and between the secondary filtration disinfection unit 4 and the composite biofilm treatment unit 5 are arranged at a position inside the rotary drum of the rotary drum microfilter 33. The rotary drum screen mesh of the rotary drum microfilter 33 of the primary filtration self-cleaning unit 3 is larger than that of the rotary drum microfilter 33 of the secondary filtration disinfection unit 4. Specifically, the rotary drum screen mesh of the rotary drum microfilter 33 of the primary filtration self-cleaning unit 3 is 150-250 meshes, which mainly traps large particle suspended matter with a particle size >75 μm, and the rotary drum screen mesh of the rotary drum microfilter 33 of the secondary filtration disinfection unit 4 is 80-120 meshes, which further removes small suspended matter with a particle size >150 μm.

[0026] The water distribution pipe 32 is also connected with the water outlet 12 of the device, and can spray the treated water to the drum microfilter 33 for self-cleaning. The primary filtration self-cleaning unit 3 and the secondary filtration disinfection unit 4 each further comprise a liquid level sensor. The liquid level sensor is used to monitor the liquid level outside the drum microfilter 33. When the liquid level outside the drum microfilter 33 is higher than the rotating shaft thereof, the drum is self-cleaned, and the suspended solids on the outer surface of the drum are washed to the bottom of the unit and discharged from the sludge outlet.

[0027] The secondary filtration disinfection unit 4 is also provided with an ultraviolet disinfection lamp to kill pathogenic microorganisms.

[0028] The overflow tank for connecting the secondary filtration disinfection unit 4 and the composite biological membrane treatment unit 5 is arranged on the partition plate 2 between the secondary filtration disinfection unit 4 and the composite biological membrane treatment unit 5, and the overflow tank is located above the drum of the drum microfilter 33. When the drum is blocked, water can be introduced into the composite biological membrane treatment unit 5 through the overflow tank to avoid damage to the device due to overloading.

[0029] The curved brush 51 is arranged in the composite biological membrane treatment unit 5 in a three-dimensional net-like distribution, and the nitrification-denitrification composite microbial membrane is loaded on the surface of the curved brush 51. The nitrification-denitrification composite microbial membrane contains a low-temperature resistant bacterial agent treated by immobilization. The composite biological membrane treatment unit 5 is also provided with an aeration device, and a dissolved oxygen gradient is formed in the composite biological membrane treatment unit 5 by controlling the aeration intensity, so as to realize simultaneous nitrification and denitrification.

[0030] In the deep physical-biological filtration unit 6, the multiple layers of rattan cotton filter media 61 are arranged in parallel with a spacing of 8-15 cm, and the total number of layers is 8-12.

[0031] The modular composite adsorption unit 7 is provided with three filter material modules 71, which are a volcanic rock filter material module, a zeolite filter material module and an activated carbon filter material module in sequence along the direction of water flow. The volcanic rock is used to adjust the pH value and mineral balance of water, the zeolite is used to selectively adsorb ammonia nitrogen, and the activated carbon is used to adsorb organic matter and odor. The volcanic rock filter material module, the zeolite filter material module and the activated carbon filter material module are each a module structure filled with filter material through a net-shaped packaging bag and placed on a grid 72. When the adsorption efficiency decreases, the module can be independently taken out and quickly replaced without stopping or emptying the entire unit.

[0032] The composite biofilm treatment unit 5, the deep physical-biological filtration unit 6 and the modular composite adsorption unit 7 form an up-and-down alternating baffle water flow path through the corresponding unit inlet and outlet water ports 21 and the equipment outlet water port 12, thereby greatly improving the hydraulic retention time and the pollutant removal efficiency. Specifically, the unit inlet and outlet water ports 21 between the secondary filtration and disinfection unit 4 and the composite biofilm treatment unit 5 are arranged inside the drum of the drum microfilter 33, i.e. at the middle part of the partition plate 2 between the secondary filtration and disinfection unit 4 and the composite biofilm treatment unit 5, the unit inlet and outlet water ports 21 between the composite biofilm treatment unit 5 and the deep physical-biological filtration unit 6 are arranged at the lower part of the partition plate 2 between the composite biofilm treatment unit 5 and the deep physical-biological filtration unit 6, the unit inlet and outlet water ports 21 between the deep physical-biological filtration unit 6 and the modular composite adsorption unit 7 are arranged at the upper part of the partition plate 2 between the deep physical-biological filtration unit 6 and the modular composite adsorption unit 7, and the equipment outlet water port 12 is arranged at the lower part of the side wall of the box body 1.

[0033] The equipment also comprises a water quality online monitoring unit and a control unit 8.

[0034] The water quality online monitoring unit is used to monitor the water quality data of the treated water discharged from the equipment outlet water port 12, including key water quality parameters such as ammonia nitrogen, nitrite, pH, dissolved oxygen and turbidity.

[0035] The control unit 8 is connected with the water quality online monitoring unit and the liquid level sensor signals of the primary filtration and self-cleaning unit 3 and the secondary filtration and disinfection unit 4. When the water quality online monitoring module detects that the treated water does not meet the standard, the residence time of the water in the equipment is prolonged, and the irradiation dose of the ultraviolet disinfection lamp is increased. When the liquid level sensor detects that the liquid level is higher than the rotating shaft of the corresponding drum microfilter 33, the water distribution pipe 32 sprays the treated water to the corresponding drum microfilter 33 for self-cleaning.

[0036] As Figure 3As shown, the treatment method for aquaculture wastewater is as follows: The wastewater is pumped into the primary filtration self-cleaning unit 3, where it undergoes primary filtration through a rotary drum microfilter 33. When the level sensor detects that the liquid level is higher than the rotating shaft of the rotary drum microfilter 33, the filter self-cleans. The water after primary filtration enters the secondary filtration and disinfection unit 4, where it undergoes secondary filtration through the rotary drum microfilter 33 and is simultaneously disinfected by ultraviolet light. When the level sensor detects that the liquid level is higher than the rotating shaft of the rotary drum microfilter 33, the filter self-cleans. The water after secondary filtration enters the composite biofilm treatment unit 5, where nitrification and denitrification reactions occur through a nitrification-denitrification composite microbial membrane, removing ammonia nitrogen, nitrite, and organic pollutants from the water. The reacted water then enters the deep physical-biological filtration unit 6, where it undergoes deep filtration and biodegradation through multi-layered stacked cotton filter media 61. After deep filtration, the water enters the modular composite adsorption unit 7, where it is adsorbed sequentially by volcanic rock, zeolite, and activated carbon, further stabilizing the water quality and removing residual pollutants. The adsorbed water is discharged from the equipment outlet 12. Water that meets the treatment standards can be discharged or reused for self-cleaning, while water that does not meet the standards can be re-entered into the equipment for re-treatment. The entire treatment process is automatically managed and optimized by the control unit 8 based on monitoring data from the online water quality monitoring unit and the level sensors of the primary filtration self-cleaning unit 3 and the secondary filtration disinfection unit 4.

[0037] In one specific embodiment, the equipment has external dimensions of 3.45m in length × 1.1m in width × 1.5m in height. The main structure is made of 304 stainless steel with a thickness of 2.0mm. The equipment has a net weight of 1.1 tons, a designed processing capacity of 10 tons / day, and a total operating power of 2.2kW, including a 1.5kW water pump, a 0.3kW ultraviolet lamp, and a 0.4kW control system.

[0038] The specific parameter settings for each processing unit are as follows: Primary filtration self-cleaning unit 3: Equipped with a 200-mesh stainless steel rotary drum screen with a pore size of 75μm, a drum diameter of 0.6m, and a length of 0.8m. The working pressure of the water distribution pipe 32 is 0.3~0.5MPa, and the trigger height of the liquid level sensor is set to 0.7m from the bottom of the tank. When the liquid level reaches this set value, the self-cleaning program is automatically started.

[0039] Secondary filtration and disinfection unit 4: Equipped with a 100-mesh stainless steel rotary drum screen with a pore size of 150μm. The ultraviolet disinfection lamps are 254nm wavelength UV lamps, with a specification of 30W x 2 lamps, ensuring that the disinfection time of the effluent in this unit is >10 seconds. An overflow tank is also provided to ensure safe operation of the equipment.

[0040] Composite biofilm treatment unit 5: fish pool filter brush with length of 0.8 m and diameter of 0.15 m, filling rate of 50%. The brush surface is loaded with nitrifying bacteria and denitrifying bacteria composite inoculum, with a bacterial count of >10 8 CFU / g, forming a stable biological filter membrane system. The hydraulic retention time of the unit is 3 hours, and the micro-porous aeration method is used, with a gas-water ratio of 3:1.

[0041] Deep physical-biological filtration unit 6: 10 layers of rattan cotton filter cotton are arranged, with a thickness of 5 cm and an interval of 10 cm. The pore size of the filter cotton is 0.5-1.0 mm, and the porosity is >90%, achieving the synergistic effect of physical interception and biological degradation.

[0042] Modular composite adsorption unit 7: containing three kinds of filter materials in independent net packaging, with a filter material package size of 30 cm x 20 cm x 10 cm and a mesh size of 1 mm. Among them, the volcanic rock has a particle size of 3-5 cm and a filling amount of 20 kg. The zeolite has a particle size of 2-3 cm and a filling amount of 20 kg. The activated carbon of coconut shell has a particle size of 2-4 mm and a filling amount of 10 kg, respectively realizing the functions of water quality adjustment, ammonia nitrogen adsorption and organic matter and odor removal.

[0043] Water quality online monitoring unit and control unit 8: real-time monitoring parameters include ammonia nitrogen, nitrite, pH, dissolved oxygen and turbidity, with a monitoring frequency of once every 30 minutes. The control mode adopts PLC automatic control, while manual operation mode is reserved for selection. It has the functions of water quality exceeding standard alarm, equipment fault alarm and filter replacement prompt, which can feedback the equipment running state in time and guide the maintenance operation.

[0044] The device is used in a prawn farm in Jiangsu, with a breeding area of 20 mu and a breeding density of 80,000 tails per mu. The daily tail water discharge is about 50 tons / day. In order to realize the standard treatment of tail water, the prawn farm uses the integrated aquaculture tail water treatment equipment of the embodiment, a total of 5 devices are configured and operated in parallel, the total treatment capacity of the device is matched with the daily discharge capacity of the farm, reaching 50 tons / day.

[0045] The water quality parameters of the aquaculture farm breeding tail water inlet are as follows: ammonia nitrogen content is 8-15 mg / L, nitrite content is 3-8 mg / L, total phosphorus content is 2-5 mg / L, COD value is 40-80 mg / L, suspended solids content is 100-300 mg / L, and pH value is 7.5-8.5. During the operation of the equipment, a 24-hour continuous operation mode is adopted, and the total daily power consumption is 11 kW·h (the daily average power consumption of a single equipment is 2.2 kW·h); the maintenance operation is performed at the following frequencies: the equipment operation state is checked once a week, the drum screen is cleaned once a month, and the filter material bag of the modular composite adsorption unit is replaced every 3-6 months; the maintenance process is simple and does not affect the continuous operation of the equipment. It is verified through actual operation that the equipment can stably treat the high-pollution load breeding tail water of the aquaculture farm, and the treated water quality meets the first-level standard of "Freshwater Pond Aquaculture Water Discharge Requirements" (SC / T9101-2007), and meets the tail water treatment needs of large-scale shrimp breeding.

[0046] The control unit is based on a PLC core control system, and realizes automatic regulation and control, early warning and alarm, and energy saving optimization of equipment operation through liquid level sensing and water quality feedback linkage design. The specific control strategy is as follows: Automatic liquid level control: when the liquid level monitoring value of the primary filtration self-cleaning unit reaches 0.7 m, the self-cleaning is automatically triggered, the spray washing time is set to 30 seconds, and the spray washing interval is 5 minutes to ensure the cleanliness of the screen; when the liquid level of the secondary filtration and disinfection unit reaches 0.7 m, the self-cleaning and ultraviolet disinfection lamp are started simultaneously, and the screen is prevented from being blocked and disinfected.

[0047] Water quality feedback control: real-time monitoring of water quality parameters, when the ammonia nitrogen concentration of the effluent is >2.0 mg / L, the hydraulic retention time is automatically adjusted from 3 hours to 4 hours to strengthen the denitrification effect; when the effluent turbidity is >10 NTU, the drum type microfilter inspection prompt is generated immediately, and the self-cleaning flushing frequency is automatically increased to ensure the filtration efficiency.

[0048] Early warning and alarm mechanism: set hierarchical early warning logic, when the water quality parameter approaches the limit value (such as ammonia nitrogen >1.5 mg / L), start yellow early warning prompt; when the water quality parameter exceeds the standard (such as ammonia nitrogen >2.0 mg / L) or equipment failure is detected, trigger red alarm, and send notification information to the manager to ensure timely disposal; support remote monitoring and operation function of mobile phone APP at the same time, realize real-time grasp of operation state.

[0049] Data recording and analysis: automatically collect and store water quality monitoring data and equipment operation parameters, generate daily report, weekly report and monthly report according to preset period, accurately analyze treatment effect and operation trend, and provide data support for optimization operation.

[0050] Integrated multiple energy-saving measures: the water inlet pump adopts frequency control technology, dynamically adjusts the running power according to the actual treatment capacity, reduces the invalid energy consumption; the ultraviolet disinfection lamp implements intermittent operation mode according to the water quality monitoring results, continuously runs when the treatment load is high, and runs according to the cycle of running for 30 minutes and stopping for 10 minutes when the water quality is up to standard and stable; when in low treatment load state at night, automatically switch to energy-saving mode, further reduce the overall operation energy consumption.

[0051] In the present application, unless otherwise specified, the scientific and technical terms used herein have the meanings commonly understood by those skilled in the art. And the reagents, materials and operation steps used herein are widely used reagents, materials and conventional steps in the corresponding field.

[0052] It should be noted that the terms such as "up", "down", "left", "right", "front", "back" and the like cited in the invention are only for the convenience of clear description, and are not used to limit the scope of the implementation of the invention. The change or adjustment of the relative relationship is also considered as the implementation of the invention without substantial change of the technical content.

[0053] Finally, it should be pointed out that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An integrated aquaculture tail water treatment device, characterized in that: a box body; the box body is divided into multiple units by a partition plate, and the units are sequentially arranged along the water flow direction as a primary filtration self-cleaning unit, a secondary filtration disinfection unit, a composite biofilm treatment unit, a deep physical-biological filtration unit and a modular composite adsorption unit; the primary filtration self-cleaning unit is used for primary filtration of tail water, and the device treated water can be used for self-cleaning of the filtration structure; the secondary filtration disinfection unit is used for disinfection and further filtration of water; the composite biofilm treatment unit uses nitrification-denitrification composite microbial membrane to treat water; the deep physical-biological filtration unit uses multi-layer stacked rattan cotton filter medium to treat water; and the modular composite adsorption unit adsorbs water.

2. The integrated aquaculture tail water treatment device according to claim 1, characterized in that: the primary filtration self-cleaning unit and the secondary filtration disinfection unit each comprise a water storage plate, a water distribution pipe and a rotary drum microfilter; the water storage plate is fixed in the corresponding unit and forms a water storage groove between the water storage plate and the side wall of the unit inlet; the water distribution pipe and the rotary drum microfilter are arranged on the side of the water storage plate away from the unit inlet; the rotary shaft of the rotary drum microfilter is arranged transversely; the water distribution pipe is arranged on one side of the rotary drum microfilter, and the water spray holes face the filter screen of the rotary drum microfilter; the water distribution pipe is connected with the water storage groove and can draw water from the water storage groove to spray it to the rotary drum microfilter for filtration; the unit inlet and outlet between the primary filtration self-cleaning unit and the secondary filtration disinfection unit and between the secondary filtration disinfection unit and the composite biofilm treatment unit are arranged at a position inside the rotary drum of the rotary drum microfilter; the mesh size of the rotary drum screen of the rotary drum microfilter of the primary filtration self-cleaning unit is larger than that of the rotary drum microfilter of the secondary filtration disinfection unit.

3. The integrated aquaculture tail water treatment device according to claim 2, characterized in that: the water distribution pipe is further connected with the device outlet, and the device treated water can be sprayed to the rotary drum microfilter for self-cleaning; the primary filtration self-cleaning unit and the secondary filtration disinfection unit each further comprise a liquid level sensor; the liquid level sensor is used for monitoring the liquid level outside the rotary drum microfilter; when the liquid level outside the rotary drum microfilter is higher than the rotary shaft, the rotary drum is self-cleaned.

4. The integrated aquaculture tail water treatment device according to claim 3, characterized in that: the secondary filtration disinfection unit further comprises an ultraviolet disinfection lamp; the partition plate between the secondary filtration disinfection unit and the composite biofilm treatment unit is provided with an overflow tank above the rotary drum of the rotary drum microfilter.

5. The integrated aquaculture tail water treatment device according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The complex biological membrane treatment unit is internally provided with a three-dimensional reticular distribution of curved surface brushes, and the nitrification-denitrification composite microbial membrane is loaded on the surface of the curved surface brushes. The nitrification-denitrification composite microbial membrane comprises a low-temperature resistant bactericide agent which is subjected to immobilization treatment. The complex biological membrane treatment unit is further provided with an aeration device.

6. The integrated aquaculture tail water treatment device according to claim 1, characterized in that: In the deep physical-biological filtration unit, a plurality of layers of stacked rattan cotton filter media are arranged in parallel at a spacing of 8-15 cm, and the total number of layers is 8-12.

7. The integrated aquaculture tail water treatment device according to claim 1, characterized in that: The modularized complex adsorption unit is internally provided with, in sequence along the water flow direction, a volcanic rock filter material module, a zeolite filter material module and an activated carbon filter material module, and the volcanic rock filter material module, the zeolite filter material module and the activated carbon filter material module are all module structures filled with filter materials through reticular packaging bags.

8. The integrated aquaculture tail water treatment device according to claim 1, characterized in that: The complex biological membrane treatment unit, the deep physical-biological filtration unit and the modularized complex adsorption unit form an up-and-down alternating baffle type water flow path through the corresponding unit water inlet and outlet and the device water outlet.

9. The integrated aquaculture tail water treatment device according to claim 4, characterized in that: It further comprises a water quality online monitoring unit and a control unit; The water quality online monitoring unit is used for monitoring the water quality data of the treated water discharged from the device water outlet; The control unit is connected with the water quality online monitoring unit and the liquid level sensor signal of the primary filtration self-cleaning unit and the secondary filtration disinfection unit, when the water quality online monitoring module monitors that the treated water does not meet the standard, the residence time of the water in the device is prolonged, and the irradiation dose of the ultraviolet disinfection lamp is increased, when the liquid level sensor monitors that the liquid level is higher than the shaft of the corresponding rotary drum microfilter, the water distribution pipe extracts the treated water and sprays it to the corresponding rotary drum microfilter for self-cleaning.

10. The method for treating aquaculture tail water by the device according to any one of claims 4-9, characterized in that: The tail water is pumped into the primary filtration self-cleaning unit, and primary filtration is carried out through the rotary drum microfilter, and when the liquid level sensor monitors that the liquid level is higher than the shaft of the rotary drum microfilter, the rotary drum microfilter is self-cleaned; The water after primary filtration enters the secondary filtration disinfection unit, and secondary filtration is carried out through the rotary drum microfilter, and at the same time, ultraviolet disinfection is accepted by the ultraviolet disinfection lamp, and when the liquid level sensor monitors that the liquid level is higher than the shaft of the rotary drum microfilter, the rotary drum microfilter is self-cleaned; The water after secondary filtration enters the complex biological membrane treatment unit, and nitrification and denitrification reactions are carried out through the nitrification-denitrification composite microbial membrane to remove ammonia nitrogen, nitrite and organic pollutants in the water; The water after reaction enters the deep physical-biological filtration unit, and deep filtration and attached biological degradation are carried out through the plurality of layers of stacked rattan cotton filter media. The deep filtered water body enters the modular composite adsorption unit, and is sequentially adsorbed by the volcanic rock, the zeolite and the activated carbon; The adsorbed water body is discharged from the water outlet of the equipment.

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