Land-based circulating water sterilizing and filtering tank controlled by PLC (Programmable Logic Controller)

Abstract

The utility model discloses a PLC (Programmable Logic Controller)-controlled land-based circulating water sterilizing and filtering tank, and relates to the technical field of aquaculture. The PLC-controlled land-based circulating water sterilizing and filtering tank comprises a rectangular filtering tank arranged underground, and the rectangular filtering tank is divided into an ozone filtering area, a secondary filtering area and a sterilizing filtering area from left to right in the direction from water inlet to water outlet; the ozone filtering area, the secondary filtering area and the sterilization filtering area are respectively provided with a wireless liquid level controller with a multi-point detection function. A three-stage filtering and sterilizing mechanism of the ozone filtering area, the secondary filtering area and the ultraviolet sterilizing area is adopted, a plurality of functional areas are divided from the water inlet direction to the water outlet direction, a water body sequentially passes through different areas to be gradually and pertinently treated, organic substances such as residual feed and excrement in the water body are effectively removed, and the water quality is improved. And toxic and harmful ammonia nitrogen, nitrite and the like are avoided, so that the water quality is ensured to be clean, and a healthy living environment is provided for aquaculture.

Description

TECHNICAL FIELD

[0001] The utility model relates to the aquaculture technical field especially relates to a PLC control's land base circulating water sterilization and filter pond. BACKGROUND

[0002] With the rapid development of aquaculture, the increasing market demand, the aquaculture scale expands unceasingly, the challenge to the aquaculture is more and more many, as the water quality management of the life guarantee environment of the welfare of aquaculture animal becomes the most important in aquaculture, especially in the process of cultivation, the improper treatment of the feces and the organic waste such as residual feed of harmful substances such as ammonia nitrogen in the cultivation water, not only will lead to water quality deterioration, influence aquaculture health, but also greatly reduce the cultivation efficiency, add the cost of cultivation, reduce the product quality of aquaculture.

[0003] In the circulating water aquaculture system, the function of the water purification filtration system is particularly critical, which is responsible for removing organic matter such as residual feed, excrement, mucus and toxic and harmful ammonia nitrogen, nitrite, hydrogen sulfide in the water, so as to maintain the health of the cultivation environment.

[0004] At present, the tail water generated in the process of cultivation is usually discharged in a simple way, which not only destroys the ecological environment but also wastes resources. Some use the way of filling filter material, although it can have obvious filtering effect, but it needs to replace or clean the filter material regularly, which increases the workload of maintenance workers and affects work efficiency. Some use microfiltration machine for filtration, and the cost of microfiltration machine is relatively high. When the cultivation water is full of dirt or the particle is large, or the primary filtration mesh number is greatly different from the microfiltration mesh number, the microfiltration machine often appears the phenomenon of blockage or frequent flushing, and even needs to be stopped for maintenance, which greatly reduces the filtration efficiency. Therefore, the utility model provides a kind of convenient cleaning and maintenance to solve the problems in the above background technology. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing a kind of PLC control's land base circulating water sterilization and filter pond, and the filter material is convenient and quick to replace, and the water area is large, the filtration efficiency is high, the water purification effect is higher than that of traditional mode PLC control land base circulating water sterilization and filter pond, and the technical problems in the above background technology are solved.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: A PLC control's land base circulating water sterilization and filter pond, including setting in the underground rectangle filter pond, the rectangle filter pond is from the water inlet to the water outlet direction, from left to right direction is divided into ozone filter area, secondary filter area and sterilization filter area, ozone filter area, secondary filter area and sterilization filter area are provided with a multi-point detection wireless liquid level controller respectively, the rectangle filter pond wall one side sets up external PLC controller, the ozone filter area, secondary filter area and sterilization filter area all are provided with wireless liquid level controller first water level detection point, wireless liquid level controller second water level detection point, wireless liquid level controller third water level detection point, and are provided with the isolation wall between each filter area, the ozone filter area, secondary filter area and sterilization filter area are separated through the isolation wall, first water hole and second water hole are set up on the isolation wall.

[0007] Preferably, the ozone filter area is the first filter area, the water inlet pipe is arranged above the wall on one side of the ozone filter area, the water inlet pipe is connected with the water pump on one side, the water inlet pipe is connected with the elbow pipe on the other side, the elbow pipe is downward at an angle of 45 degrees, the first L-shaped fixing frame is arranged in the ozone filter area, the height of the water outlet of the elbow pipe is lower than the upper edge of the vertical part of the first L-shaped fixing frame, and the height of the water outlet of the elbow pipe is lower than the upper edge by more than 10 cm, the first sewage outlet is arranged at the bottom of the ozone filter area, the first intelligent electromagnetic valve is arranged below the first sewage outlet, and the sewage main pipeline is connected.

[0008] Preferably, the pool bottom below the water inlet pipe of the ozone filter area and the pool bottom below the first water hole of the secondary filter area are each provided with 5-8 heightening walls, the height of the heightening wall is 1 / 6-1 / 4 of the height of the cement filter wall, the interval between two adjacent heightening walls is 30-60 cm, the ozone micro-spraying aeration device is arranged above the heightening wall, the PLC controller is electrically connected with the water inlet pump and the ozone aerator, the ozone aerator is connected with the ozone micro-spraying aeration device, and when the water level reaches the second water level detection point of the wireless liquid level controller, the PLC controller automatically starts the ozone micro-spraying aeration device of the ozone filter area and the secondary filter area.

[0009] Preferably, the ozone micro-spraying aeration device mainly comprises an ozone aeration main pipe extending from the pool edge to the pool bottom on one side of the water inlet and a plurality of branch aeration pipes fixed on the heightening wall, the ozone aeration main pipe is connected with the branch aeration pipe through the reducing tee, a plug one is arranged at the tail end of the ozone aeration main pipe, a valve is arranged on each branch aeration pipe, one row of branch aeration pipes is opened or closed through the valve, a plurality of internal tooth tees are uniformly arranged on the branch aeration pipe, an ozone micro-spraying aeration head is arranged on the internal tooth tee, and a plug two is arranged at the tail end of each branch aeration pipe.

[0010] Preferably, the first L-shaped fixing frame is provided with a first filter screen plate fixed by screws, the size of the first filter screen plate is the same as that of the first L-shaped fixing frame, and the first filter screen plate completely covers the first L-shaped fixing frame to form a first vertical flow and reverse osmosis filtration area.

[0011] Preferably, the first L-shaped fixing frame is provided with a first filter screen plate fixed by screws, the size of the first filter screen plate is the same as that of the first L-shaped fixing frame, and the first filter screen plate completely covers the first L-shaped fixing frame to form a first vertical flow and reverse osmosis filtration area.

[0012] Preferably, the second L-shaped fixing frame is provided with a second filter screen plate fixed by screws, the size of the second filter screen plate is the same as that of the second L-shaped fixing frame, and the second filter screen plate completely covers the second L-shaped fixing frame to form a second vertical flow and reverse osmosis filtration area.

[0013] Preferably, the third L-shaped fixing frame is provided with a third filter screen plate fixed by screws, the size of the third filter screen plate is the same as that of the third L-shaped fixing frame, and the third filter screen plate completely covers the third L-shaped fixing frame to form a third vertical flow and reverse osmosis filtration area.

[0014] Preferably, the third L-shaped fixing frame is provided with a third filter screen plate fixed by screws, the size of the third filter screen plate is the same as that of the third L-shaped fixing frame, and the third filter screen plate completely covers the third L-shaped fixing frame to form a third vertical flow and reverse osmosis filtration area.

[0015] Compared with the related art, the PLC-controlled land-based circulating water sterilization and filtration pool has the following beneficial effects:

[0016] 1. Intelligent control: the entire filtration and sterilization process is automatically controlled by a PLC controller, including ozone aeration, ultraviolet light sterilization, water pump start-stop, and timed sewage discharge, greatly improving work efficiency and operational convenience.

[0017] 2. High-efficiency filtration and sterilization: a three-stage filtration and sterilization mechanism is adopted, including an ozone filtration zone, a secondary filtration zone, and an ultraviolet sterilization zone, multiple functional zones are divided from the inlet to the outlet, allowing the water body to pass through different areas for step-by-step and targeted treatment, effectively removing organic matter such as leftover food and excrement, as well as toxic and harmful ammonia nitrogen and nitrite, ensuring clean water quality and providing a healthy living environment for aquatic farming.

[0018] 3. Energy saving: according to the different bacterial content in the water body, the use of ozone aeration and ultraviolet light is flexibly adjusted to avoid unnecessary energy waste. At the same time, the ultraviolet light is designed in groups, which can be turned on one or two groups according to needs, further reducing power consumption.

[0019] 4. Easy to maintain: automatic timed sewage discharge is achieved through the PLC controller, reducing the frequency of manual cleaning of the filter material and lowering maintenance costs and workload. In addition, the cleaning and maintenance of the ultraviolet lamp tube covered with dirt is also more convenient, only need to adjust the opening time of the ultraviolet light in the PLC controller.

[0020] 5. Environmentally friendly and sustainable: compared with traditional tail water discharge methods, this patent realizes the recycling of aquaculture water through a circulating water filtration and sterilization system, protecting the ecological environment and saving water resources, in line with the concept of sustainable development.

[0021] In summary, the PLC-controlled land-based circulating water sterilization and filtration tank of the present patent has the advantages of intelligence, high-efficiency filtration and sterilization, energy saving, easy maintenance, and environmental sustainability, providing strong support for the healthy development of the aquaculture industry. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a top view structure schematic diagram of the utility model;

[0023] Figure 2 It is a side view structure schematic diagram of the utility model;

[0024] Figure 3 It is a top view structure schematic diagram of the ozone micro-spraying aeration device of the utility model;

[0025] Figure 4 It is a side view structure schematic diagram of the ozone micro-spraying aeration device of the utility model;

[0026] Figure 5 It is a structure schematic diagram of the L-shaped fixing frame of the utility model.

[0027] In the figure: 1, water inlet pipe; 2, 45-degree elbow; 3, first L-shaped fixing frame; 4, first filter screen plate; 5, first water passage; 6, first sewage outlet; 7, second L-shaped fixing frame; 8, second filter screen plate; 9, second sewage outlet; 10, second water passage; 11, third L-shaped fixing frame; 12, third filter screen plate; 13, third sewage outlet; 14, heightening wall; 15, ozone micro-spraying aeration device; 16, first intelligent electromagnetic valve; 17, second intelligent electromagnetic valve; 18, third intelligent electromagnetic valve; 19, PLC controller; 20, wireless liquid level controller first water level detection point; 21, wireless liquid level controller second water level detection point; 22, wireless liquid level controller third water level detection point; 101, ozone aeration main pipe; 102, plug one; 103, valve; 104, ozone micro-spraying aeration head; 105, inner tooth tee; 106, plug two. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] Please refer to Figures 1-5 The present application provides a technical solution: a PLC-controlled land-based circulating water sterilization and filtration tank, which comprises a rectangular filtration tank arranged underground. The rectangular filtration tank is divided into an ozone filtration zone, a secondary filtration zone and a sterilization filtration zone from left to right in the direction from water inlet to water outlet. The ozone filtration zone, the secondary filtration zone and the sterilization filtration zone are respectively provided with a wireless liquid level controller for multi-point detection. An external PLC controller 19 is arranged on one side of the wall of the rectangular filtration tank. The ozone filtration zone, the secondary filtration zone and the sterilization filtration zone are respectively provided with a wireless liquid level controller first water level detection point 20, a wireless liquid level controller second water level detection point 21 and a wireless liquid level controller third water level detection point 22. An isolation wall is arranged between each filtration zone. The ozone filtration zone, the secondary filtration zone and the sterilization filtration zone are separated by the isolation wall. The isolation wall is provided with a first water passage 5 and a second water passage 10. The first water passage 5 and the second water passage 10 are provided with a plurality of passages.

[0030] In this embodiment, the underground rectangular filter tank is used to increase the water treatment capacity, and a large-diameter water inlet (160mm-400mm) is adopted. The tank body has a large volume, and the common PP box is used. When the volume increases, the box will bulge outward. Therefore, the box is arranged underground to avoid the bulging problem of the large-volume tank, and the water flow in the tank can flow to the next filtering area through the natural height difference by gravity, reducing the use of power resources and being more economical and practical. From the water inlet to the water outlet of the filter tank, it is divided into an ozone filtering area, a secondary filtering area and a sterilization filtering area. Each filtering area is provided with a multi-point detection wireless liquid level controller. When one of the wireless liquid level controllers reaches the first water level control point (30cm-50cm from the upper edge of the tank wall) set in each area, the PLC controller automatically closes the water inlet pump. The filtering areas are separated by a partition wall (or a partition plate). The partition wall (or the partition plate) is provided with a plurality of water passing holes. The height of the water passing hole is 60%-80% of the height of the wall, forming a reverse osmosis filter in each area. The contaminated particles are collected at the bottom of each purification area by natural gravity.

[0031] In the ozone filtering area, the water inlet pipe 1 is arranged above one side wall of the ozone filtering area. The water inlet pipe 1 is connected with the water pump on one side, and connected with a 45-degree elbow 2 with the downward direction on the other side. The first L-shaped fixing frame 3 is arranged in the middle of the ozone filtering area. The water outlet of the 45-degree elbow 2 is lower than the upper edge of the vertical part of the first L-shaped fixing frame 3 by more than 10cm. The first pollution discharge port 6 is arranged at the bottom of the ozone filtering area. The first intelligent electromagnetic valve 16 is arranged below the first pollution discharge port 6, and then connected with the main pollution discharge pipeline.

[0032] In the ozone filtering area, the water inlet pipe 1 is arranged above one side wall of the ozone filtering area. The water inlet pipe 1 is connected with the water pump on one side, and connected with a 45-degree elbow 2 with the downward direction on the other side. The first L-shaped fixing frame 3 is arranged in the middle of the ozone filtering area. The water outlet of the 45-degree elbow 2 is lower than the upper edge of the vertical part of the first L-shaped fixing frame 3 by more than 10cm. The first pollution discharge port 6 is arranged at the bottom of the ozone filtering area. The first intelligent electromagnetic valve 16 is arranged below the first pollution discharge port 6, and then connected with the main pollution discharge pipeline.

[0033] In this embodiment, when the water level reaches the second water level detection point 21 of the wireless liquid level controller, the PLC controller automatically starts the ozone micro-spraying aerator 15 in this area.

[0034] The ozone micro-spray aeration device 15 mainly consists of an ozone aeration main pipe 101 extending from the pool side to the pool bottom on one side of the inlet and multiple branch aeration pipes fixed on the raised wall 14. The ozone aeration main pipe 101 is connected to the branch aeration pipes through a reducing tee. A plug 102 is provided at the end of the ozone aeration main pipe 101. A valve 103 is provided on each branch aeration pipe. A branch aeration pipe is opened and closed individually by the valve 103. Multiple internal thread tees 105 are evenly arranged on the branch aeration pipes. Ozone micro-spray aeration heads 104 are provided on the internal thread tees 105. A plug 2 106 is provided at the end of each branch aeration pipe.

[0035] The ozone filtration area is equipped with a first L-shaped fixing frame 3 in the middle. The first L-shaped fixing frame 3 is divided into an upright part, a horizontal part and a triangular connecting part. The upright part and the horizontal part are respectively welded with grid-shaped support rods in the middle. The L-shaped fixing rods on both sides are fixed to the wall. The part connecting the upright part and the horizontal part of the first L-shaped fixing frame 3 is welded into an L shape, and triangular connecting diagonal rods are welded on the front and back sides of the L shape. The upright part is welded with 1-2 long rods through the bottom in the middle as upright support. The horizontal part is welded and fixed to the isolation wall opposite the water inlet.

[0036] The first L-shaped fixing frame 3 is fixed with a first filter screen 4 by screws. The first filter screen 4 is the same size as the first L-shaped fixing frame 3 and completely covers it, forming the first vertical flow-through and reverse osmosis filtration zone.

[0037] In this implementation plan, the first L-shaped fixing frame 3 is made of 316 stainless steel. After multiple filtration tests, the vertical type was found to be relatively prone to clogging, especially at the bottom of the pool. After clogging, the water flow area decreased and the water flow was relatively small. After switching to L-shaped filtration, a vertical flow plus reverse osmosis mode was adopted, which increased the water flow area. At the same time, the dirt in the reverse osmosis filter could naturally sink under gravity, reducing the chance of clogging and making it easier to clean. When using L-shaped filtration, due to the large water flow area, the pressure is also relatively large. When using only filter screen and filter strips, after a period of use, the filter screen will deform due to the large water flow, affecting the filtration effect. Therefore, it was adjusted to weld into an L-shaped fixing frame, and then the fixing frame was fixed to the pool wall and bottom of the pool with expansion nails. The filter screen plate was then fixed on the fixing frame.

[0038] The second L-shaped fixing frame 7 is arranged on one side of the partition wall from the secondary filtration area to the sterilization filtration area, the second filter screen plate 8 is fixed on the second L-shaped fixing frame 7 through screws, the size of the second filter screen plate 8 is the same as that of the second L-shaped fixing frame 7, and the second filter screen plate 8 can completely cover the second L-shaped fixing frame 7, thereby forming a second vertical flow and reverse osmosis filtration area, a plurality of second water passing holes 10 are arranged above the partition wall between the secondary filtration area and the sterilization filtration area, a second sewage outlet 9 is arranged at the bottom of the secondary filtration area, a second intelligent electromagnetic valve 17 is arranged below the second sewage outlet 9, and then a sewage main pipeline is connected.

[0039] In the embodiment, the ozone aeration of the secondary filtration area can be set according to the water body condition, and when the water level reaches the second water level detection point of the wireless liquid level controller, the PLC controller automatically starts the ozone micro-spraying aeration device 15 in the open state.

[0040] The third L-shaped fixing frame 11 is arranged on one side of the wall body opposite to the second water passing hole 10, the third filter screen plate 12 is fixed on the third L-shaped fixing frame 11 through screws, the size of the third filter screen plate 12 is the same as that of the third L-shaped fixing frame 11, and the third filter screen plate 12 can completely cover the third L-shaped fixing frame 11, thereby forming a third vertical flow and reverse osmosis filtration area (three layers of filtration are formed through the vertical flow and reverse osmosis filtration, the first layer is filtered through a large-pore filter screen to facilitate filtering of large-particle pollutants and to improve water passing efficiency, and then the filtration density is increased to gradually purify the water body and kill bacteria and disinfect); the first filter screen plate 4 (60-mesh or 80-mesh stainless steel filter screen), the second filter screen plate 8 (150-mesh or 200-mesh stainless steel filter screen) and the third filter screen plate 12 (200-mesh or 300-mesh stainless steel filter screen) are composed of filter screens and fixed support strips.

[0041] The third L-shaped fixing frame 11 is arranged on one side of the wall body opposite to the second water passing hole 10, the third filter screen plate 12 is fixed on the third L-shaped fixing frame 11 through screws, the size of the third filter screen plate 12 is the same as that of the third L-shaped fixing frame 11, and the third filter screen plate 12 can completely cover the third L-shaped fixing frame 11, thereby forming a third vertical flow and reverse osmosis filtration area (three layers of filtration are formed through the vertical flow and reverse osmosis filtration, the first layer is filtered through a large-pore filter screen to facilitate filtering of large-particle pollutants and to improve water passing efficiency, and then the filtration density is increased to gradually purify the water body and kill bacteria and disinfect); the first filter screen plate 4 (60-mesh or 80-mesh stainless steel filter screen), the second filter screen plate 8 (150-mesh or 200-mesh stainless steel filter screen) and the third filter screen plate 12 (200-mesh or 300-mesh stainless steel filter screen) are composed of filter screens and fixed support strips.

[0042] In the embodiment, when the water level reaches the second water level detection point 21 of the wireless liquid level controller in the sterilization filtration area, the PLC controller automatically starts the ultraviolet lamp. The ultraviolet lamp is fixed through the fixing mode of the fixing clip, the surface of the ultraviolet lamp is convenient to clean, and the ultraviolet lamp tube is convenient to move and replace.

[0043] Working principle: The underground rectangular filter tank is divided into ozone filtration area, secondary filtration area and sterilization filtration area from the inlet to the outlet. The circulating water to be treated is pumped to the ozone filtration area through the 45-degree elbow 2, and the water level rises in the ozone filtration area. When the water level reaches the second water level detection point 21 of the wireless liquid level controller (over the upper edge of the ozone micro-spraying aeration head 104 in the ozone micro-spraying aeration device 15), the PLC controller 19 automatically starts the ozone gas pump. The water level continues to rise, and the ozone and the rising water in the ozone filtration area reach the first L-shaped fixed frame 3. After reverse osmosis filtration through the first filter screen 4, the water level rises to the first water hole 5, and then flows into the secondary filtration area due to the natural liquid level difference.

[0044] When the water enters the secondary filtration area, the ozone and the primary filtered water are combined again. When the water to be treated has a large number of bacteria, the ozone oxygen pump in this area can be started by setting in the PLC controller 19. When the water level reaches the second water level detection point 21 of the wireless liquid level controller (over the upper edge of the ozone micro-spraying aeration head 104 in the ozone micro-spraying aeration device 15), the PLC controller 19 automatically starts the ozone gas pump. When the water to be treated has a small number of bacteria, the ozone oxygen pump in this area can be set not to start in the PLC controller 19. After a period of time, the water level rises again to the second L-shaped fixed frame 7. After reverse osmosis filtration through the second filter screen 8, the water level rises to the second water hole 10, and the water naturally flows into the ultraviolet filtration area.

[0045] When the water enters the ultraviolet filtration area, the 10 (one in each grid of the third L-shaped fixed frame 11) 100W fully submerged ultraviolet lamps bundled on the third L-shaped fixed frame 11 can be turned on according to the need when the water level reaches the second water level detection point 21 of the wireless liquid level controller (over the third filter screen plate). When the fully submerged ultraviolet lamps are set to more than 8, they are divided into two groups in the shape of S. When the water has a large number of bacteria, both groups can be turned on at the same time to improve the sterilization efficiency. When the water quality is good, only one group can be turned on to reduce power consumption and facilitate the cleaning and maintenance of the covered dirt on the ultraviolet lamp tube. After the ultraviolet lamp is turned on for 5 minutes, the PLC controller 19 starts the water pump to pump the filtered and sterilized water into the main circulating pipeline.

[0046] When an abnormality occurs, the wireless liquid level controller in one of the ozone filtration area, the secondary filtration area or the sterilization filtration area reaches the first water level detection point 20 set in the area, and the PLC controller 19 automatically closes the inlet water pump.

[0047] The PLC controller 19 is set to automatically discharge sewage at a certain time.

[0048] A. Every 45 minutes, open the first intelligent electromagnetic valve 16 to carry out the blowdown of the ozone filtering area, and the blowdown duration is 5 minutes;

[0049] B. Every 60 minutes, open the second intelligent electromagnetic valve 17 to carry out the blowdown of the secondary filtering area, and the blowdown duration is 5 minutes;

[0050] C. Every 90 minutes, open the third intelligent electromagnetic valve 18 to carry out the blowdown of the sterilization filtering area, and the blowdown duration is 5 minutes.

[0051] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A PLC controlled land-based recirculating water sterilization and filtration pond comprising an elongated rectangular filtration pond disposed below ground, characterized in that: The long rectangular filter tank is divided into ozone filtration area, secondary filtration area and sterilization filtration area from left to right in the direction from the inlet to the outlet, and each of the ozone filtration area, the secondary filtration area and the sterilization filtration area is provided with a multi-point detection wireless liquid level controller, one side of the wall of the long rectangular filter tank is provided with an external PLC controller (19), and each of the ozone filtration area, the secondary filtration area and the sterilization filtration area is provided with a wireless liquid level controller first water level detection point (20), a wireless liquid level controller second water level detection point (21) and a wireless liquid level controller third water level detection point (22), and an isolation wall is arranged between each filtration area, the ozone filtration area, the secondary filtration area and the sterilization filtration area are separated by the isolation wall, and the isolation wall is provided with a first water passing hole (5) and a second water passing hole (10).

2. The PLC controlled land based recirculating water sterilization and filter pond of claim 1 wherein: The ozone filtration area is a first filtration area, a water inlet pipe (1) is arranged above the wall on one side of the ozone filtration area, a water pump is connected to one side of the water inlet pipe (1), a 45-degree elbow (2) downward in direction is connected to the other side of the water inlet pipe (1), a first L-shaped fixing frame (3) is arranged in the middle of the ozone filtration area, the water outlet of the 45-degree elbow (2) is lower than the upper edge of the upright part of the first L-shaped fixing frame (3) by more than 10 cm, a first blow-off port (6) is arranged at the bottom of the ozone filtration area, a first intelligent electromagnetic valve (16) is arranged below the first blow-off port (6), and a blow-off main pipeline is further connected.

3. The PLC controlled land based recirculating water sterilization and filter pond of claim 2 wherein: The bottom of the water inlet pipe (1) of the ozone filtration area and the bottom of the first water passing hole (5) of the secondary filtration area are each provided with 5-8 heightening walls (14), the height of the heightening wall (14) is 1 / 6-1 / 4 of the height of the cement filter tank wall, the distance between two adjacent heightening walls (14) is 30-60 cm, an ozone micro-spraying aeration device (15) is arranged above the heightening wall (14), the PLC controller (19) is electrically connected with the water inlet pump and the ozone aerator, the ozone aerator is connected with the ozone micro-spraying aeration device (15), and when the water level reaches the wireless liquid level controller second water level detection point (21), the PLC controller (19) automatically starts the ozone micro-spraying aeration device (15) of the ozone filtration area and the secondary filtration area.

4. The PLC controlled land-based recirculating water sterilization and filter pond of claim 3, wherein: The ozone micro-spraying aeration device (15) mainly comprises an ozone aeration main pipe (101) extending from the pool edge to the pool bottom on the side of the water inlet and a plurality of branch aeration pipes fixed on the heightening wall (14), the ozone aeration main pipe (101) is connected with the branch aeration pipes through a reducing tee, a plug one (102) is arranged at the end of the ozone aeration main pipe (101), a valve (103) is arranged on each branch aeration pipe, one row of branch aeration pipes is opened or closed through the valve (103), a plurality of internal tooth tees (105) are uniformly arranged on the branch aeration pipe, an ozone micro-spraying aeration head (104) is arranged on the internal tooth tee (105), and a plug two (106) is arranged at the end of each branch aeration pipe.

5. The PLC controlled land based recirculating water sterilization and filter pond in accordance with claim 1, wherein: The first L-shaped fixed frame (3) is provided with a first filter screen plate (4) fixed by screws, the size of the first filter screen plate (4) is the same as that of the first L-shaped fixed frame (3), and the first filter screen plate (4) completely covers the first L-shaped fixed frame (3), forming a first vertical flow and reverse infiltration filtering area.

6. The PLC controlled land based recirculating water sterilization and filter pond in accordance with claim 5, wherein: The second L-shaped fixed frame (7) is provided on one side of the isolation wall close to the sterilization filtering area, the second L-shaped fixed frame (7) is provided with a second filter screen plate (8) fixed by screws, the size of the second filter screen plate (8) is the same as that of the second L-shaped fixed frame (7), and the second filter screen plate (8) can completely cover the second L-shaped fixed frame (7), forming a second vertical flow and reverse infiltration filtering area; a plurality of second water holes (10) are provided above the isolation wall between the secondary filtering area and the sterilization filtering area, and a second sewage outlet (9) is provided at the bottom of the secondary filtering area, a second intelligent electromagnetic valve (17) is provided below the second sewage outlet (9), and a sewage main pipeline is further connected.

7. The PLC controlled land based recirculating water sterilization and filter pond in accordance with claim 6, wherein: The third L-shaped fixed frame (11) is provided on one side of the wall opposite to the second water hole (10) close to the sterilization filtering area, the third L-shaped fixed frame (11) is provided with a third filter screen plate (12) fixed by screws, the size of the third filter screen plate (12) is the same as that of the third L-shaped fixed frame (11), and the third filter screen plate (12) can completely cover the third L-shaped fixed frame (11), forming a third vertical flow and reverse infiltration filtering area; the first filter screen plate, the second filter screen plate and the third filter screen plate are composed of filter screens and fixed support strips.

8. The PLC controlled land-based recirculating water sterilization and filter pond of claim 7, wherein: A plurality of full-submersible ultraviolet light sterilization devices are vertically fixed below the third L-shaped fixed frame (11) through horizontal fixed clamps, a water suction pipe is provided above the third filter screen plate (12), the lower edge of the water suction pipe is located 3-5 cm above the third filter screen plate (12), when the water level reaches the second water level detection point (21) of the wireless liquid level controller in the sterilization filtering area, the PLC controller (19) starts the water suction pump to suck out clean water, a third sewage outlet (13) is provided at the bottom of the sterilization filtering area, a third intelligent electromagnetic valve (18) is provided below the third sewage outlet (13), and a sewage main pipeline is further connected.

9. The PLC controlled land based recirculating water sterilization and filter pond in accordance with claim 8, wherein: ​

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