Aquaculture wastewater recycling treatment system and method

Abstract

The present invention relates to the technical field of aquaculture wastewater treatment, specifically to a system and method for circulating aquaculture wastewater treatment, including a combined pool equipped with a mobile frame, a basic scraper frame and a stirring mechanism installed on the mobile frame, the stirring mechanism including a central axis fixedly connected to an outer frame, and a control component, a reinforcement head and a plurality of stirring blades are arranged on the outer frame. In the present invention, during the process of the stirring mechanism changing from rapid stirring and mixing to slow stirring and mixing, the stirring blade is rotated to change the inclination angle of the stirring blade to increase the shear surface of the stirring blade, reduce the destructive force of the stirring blade on the formed flocs, and at the same time, the reinforcement of the stirring blade by the reinforcement head is combined to ensure the stability of the stirring blade, and in the process of discharging, the stirring blade, the outer frame and the basic scraper frame are combined to form a pushing plate to push the settled flocs, so that the flocs are quickly and fully discharged from the combined pool, and the outer frame and the basic scraper frame are fixedly connected together by a reinforcement connector, thereby improving the stability of the overall structure.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture wastewater treatment, and in particular to a system and method for circulating aquaculture wastewater treatment. Background Art

[0002] In the process of aquaculture, in order to ensure the growth of aquatic animals, farmers will feed them regularly. However, the utilization rate of feed by aquatic animals such as fish and shrimp is not 100%. Uneaten feed will remain in the water environment. At the same time, farmed fish, shrimp, crabs and other organisms will continue to produce excrement during metabolism. Therefore, the generation of wastewater in the aquaculture process is inevitable. This is the result of the combined effects of the characteristics of aquaculture itself and various aquaculture operations. Aquaculture wastewater has the characteristics of high eutrophication, high organic matter content, and large discharge. It is particularly important to treat the wastewater generated by aquaculture and realize the recycling of water bodies.

[0003] Aquaculture wastewater recycling treatment refers to the technology of purifying the wastewater generated in the aquaculture process through a series of physical, chemical and biological methods so that it can be used again for aquaculture or other non-drinking purposes. Aquaculture wastewater recycling treatment generally includes physical treatment technology and chemical treatment technology, among which flocculation separation is the most common and widely used chemical pretreatment method for aquaculture wastewater. It mainly adds flocculants (such as polyaluminum chloride, polyacrylamide, etc.) to the wastewater to make the fine particles in the water condense into larger flocs. After flocculation treatment, the wastewater can be separated by sedimentation, thereby effectively removing suspended matter, organic matter, phosphorus, nitrogen and other substances in the water.

[0004] At present, the flocculation and separation treatment of aquaculture wastewater mainly includes two processes: reaction treatment and sedimentation treatment. For these two processes, small farms usually choose to use a combined pool, that is, the flocculation reaction and the sedimentation work after the reaction are completed in the same pool. Its advantages are compact structure, small site area and small initial investment.

[0005] However, the efficiency and effect of the flocculation and separation treatment using the combined tank at present need to be further improved. First, in the early reaction process, the flocculation reaction process of the wastewater needs to be quickly stirred and mixed first, so that the flocculant is fully and evenly mixed with the wastewater, and then slowly stirred and mixed to promote the formation of stable flocs. However, since a stirring blade with a narrow shear surface is usually selected during the rapid stirring process, the stirring blade is easy to destroy the already formed flocs during the slow stirring process, which not only affects the flocculation reaction effect of the wastewater, but also reduces the efficiency of the subsequent sedimentation. Secondly, in the discharge process of the subsequent sedimentation treatment, the existing discharge process usually utilizes the fluidity of the sedimentation material itself to flow to the discharge port in combination with a sludge suction pump to discharge the sedimentation material from the combined tank, but the discharge efficiency is low, and a large amount of sedimentation residue will be generated during the discharge process and attached to the inner wall of the combined tank, which affects the efficiency and effect of the next wastewater flocculation and separation treatment. Summary of the invention

[0006] The present invention provides a system and method for circulating treatment of aquaculture wastewater, so as to solve the problem of low efficiency and effect of flocculation separation treatment using a combined tank in the related art.

[0007] The present invention provides a system and method for circulating treatment of aquaculture wastewater, the system comprising a combined pool with a movable frame, a basic scraper frame and a stirring mechanism being mounted on the movable frame, the basic scraper frame always moving along the inner wall of the combined pool; the stirring mechanism comprising a central axis fixedly connected to an outer frame, the central axis passing through the basic scraper frame and then being rotatably mounted on the movable frame, the outer frame being located in the basic scraper frame, and a control component, a reinforcement head and a plurality of stirring blades being arranged on the outer frame, the stirring blades being fixedly connected to a rotating shaft and being rotatably mounted in the outer frame via the rotating shaft, the control component uniformly controlling the rotation of the stirring blades to change the inclination angle of the stirring blades and fix the stirring blades, the stirring blades entering a slow mixing process from a rapid mixing process, and the inclination angle of the stirring blades being changed by changing the stirring blades The shear surface of the stirring blade is increased and the destructive force of the stirring blade on the formed flocs is reduced. During the discharge process, the stirring blade, the outer frame and the basic scraper frame are combined to form a stable pushing plate by changing the inclination angle of the stirring blade. The pushing plate moves with the moving frame to push the sediment out of the combined pool; the reinforcement head presses against the rotating shaft to reinforce the stirring blade after the stirring blade rotates to a preset angle; a reinforcement connector is slidably arranged on the basic scraper frame, and the reinforcement connectors are symmetrically distributed and respectively located on both sides of the outer frame, and reinforcement grooves corresponding to the reinforcement connectors are opened on the outer frame. When the stirring blade, the outer frame and the basic scraper frame form a stable pushing plate, the reinforcement connector is inserted into the corresponding reinforcement groove to fix the outer frame and the basic scraper frame together and fill the gap between the outer frame and the basic scraper frame.

[0008] In one possible implementation, the control assembly includes a gear that is coaxial and fixedly connected to the rotating shaft, a sliding frame with a plurality of racks installed, and a control screw threadedly connected to the sliding frame, the racks correspond to the gears one by one and the racks mesh with the corresponding gears, the gears are coaxially arranged and fixedly connected to the corresponding rotating shaft, the sliding frame is vertically slidably installed on the outer frame and a limiting member is fixedly installed on the sliding frame, the control screw is rotatably installed on the outer frame, a vertical sliding member is installed on the basic scraper frame, the vertical sliding member is connected with a pushing member and a receiving member located below the limiting member, when the stirring blade rotates to change the inclination angle and is about to be combined with the outer frame and the basic scraper frame to form a stable pushing plate, the receiving member and the limiting member cooperate to make the vertical sliding member slide synchronously with the sliding frame and control the reinforcement connector to be inserted into the corresponding reinforcement groove through the pushing member, wherein the reinforcement groove is arc-shaped, and the surface of the reinforcement connector that fits the reinforcement groove is also arc-shaped.

[0009] In one possible implementation, the pushing member is columnar and there are several of them. The pushing members are distributed on the vertical sliding member from top to bottom and are rotatably connected to the vertical sliding member. The reinforced connecting head is provided with inclined grooves corresponding to the rotating columns one by one, and the rotating columns move in the corresponding inclined grooves.

[0010] In a possible implementation, the reinforcement head includes a reaction plate provided with a clamping port, the clamping port corresponds to the rotating shaft, the reaction plate is slidably mounted on the outer frame and automatically presses against the rotating shaft under the reaction force of the wastewater during the rotation of the outer frame.

[0011] In one possible implementation, the stirring blades are divided into several groups of two each, and the several groups of stirring blades are distributed from top to bottom. The two stirring blades in each group are respectively located on both sides of the central axis, and the reaction plates are symmetrically distributed and the symmetrically distributed reaction plates are a clamping unit. Clamping units are provided on both sides of the central axis, and the symmetrical reaction plates in the clamping units are respectively located on both sides of the corresponding side rotating shafts, and the two reaction plates in the clamping units do not work at the same time, and the two reaction plates located on the same side of the rotating shaft in the clamping units on both sides of the central axis do not work at the same time.

[0012] In one possible implementation, the stirring blade is in the shape of a rectangular plate and is provided with a sealing eave. When the stirring blade is in a vertical state and is combined with the outer frame and the basic scraper frame to form a stable pushing plate, the sealing eave seals the gap between the upper and lower adjacent stirring blades.

[0013] The present invention also provides a method for circulating treatment of aquaculture wastewater, which specifically includes the following steps: S1, rapid mixing: starting the stirring mechanism to rapidly stir the wastewater to which flocculants have been added in the combined pool and moving the movable frame to allow the stirring mechanism to move horizontally while rotating, so that the flocculants are rapidly and evenly dispersed in the wastewater.

[0014] S2. Slow mixing: After completing step S1, reduce the stirring speed of the stirring mechanism and control the rotation of the stirring blade, change the inclination angle of the stirring blade to increase the shear surface of the stirring blade, and reduce the destructive force of the stirring blade on the formed flocs.

[0015] S3, static sedimentation: After completing step S2, rotate the stirring blade to change the inclination angle of the stirring blade, move the mobile frame to the end of the combined pool to wait for the flocs in the wastewater to settle, and make the stirring blade, outer frame and basic scraper frame combine to form a stable pushing plate.

[0016] S4, discharge: after completing step S3, the upper layer of liquid is discharged first, and then the precipitated flocs in the lower layer are discharged. During this process, the moving frame is moved so that the pushing plate pushes the flocs to assist in the discharge. After the flocs are discharged, the stirring mechanism is reset to the state in step S1 and the above process is repeated.

[0017] The above one or more technical schemes in the embodiments of the present invention have at least one of the following technical effects: 1. In the process of the stirring mechanism in the present invention changing from rapid stirring and mixing to slow stirring and mixing, the shear surface of the stirring blade is increased by rotating the stirring blade to change the inclination angle of the stirring blade, thereby reducing the destructive force of the stirring blade on the already formed flocs. At the same time, the stirring blade is reinforced by the reinforcement head to ensure the stability of the stirring blade. In the process of discharging, the stirring blade, the outer frame and the basic scraper frame are combined to form a pushing plate to push the settled flocs, so that the flocs are quickly and fully discharged from the combined pool. The outer frame and the basic scraper frame are fixedly connected together by the reinforced connecting head, thereby improving the stability of the overall structure, thereby effectively improving the overall processing capacity, work efficiency and stability and reliability of the cyclic work of the flocculation treatment system as a whole.

[0018] 2. In the present invention, the control component uniformly controls the stirring blade to rotate and change the inclination angle of the stirring blade. When the sliding frame moves down to rotate the stirring blade to change the inclination angle and is about to be in a vertical state, the reinforcing connector is synchronously controlled to be inserted into the corresponding reinforcement groove, so that the outer frame and the basic scraper frame are firmly connected together, thereby improving the stability of the overall structure.

[0019] 3. The reaction plate provided in the present invention automatically presses against the rotating shaft during the rotating stirring of the stirring mechanism, thereby increasing the stability of the stirring blades and further improving the working stability of the flocculation treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the combined tank and the stirring mechanism of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the basic scraping frame and the outer frame of the present invention.

[0022] Figure 3 yes Figure 2Enlarged view of point A in the middle.

[0023] Figure 4 It is a structural schematic diagram of the sliding frame and the reaction plate of the present invention.

[0024] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0025] Figure 6 It is a cross-sectional view of a basic scraping frame of the present invention.

[0026] Figure 7 yes Figure 6 Enlarged view of point C in the middle.

[0027] Figure 8 It is a schematic diagram of the structure of the stirring blade, the outer frame and the basic scraper frame after they are combined to form a pushing plate of the present invention.

[0028] Fig. 9 It is a schematic diagram of the side structure of the blocking eaves and the stirring blades in a vertical state of the present invention.

[0029] In the figure: 1. movable frame; 2. combined pool; 3. basic scraper frame; 4. stirring mechanism; 41. outer frame; 42. central axis; 43. control component; 431. gear; 432. rack; 433. sliding frame; 434. control screw; 435. limiter; 436. vertical slide; 437. pusher; 438. receiving member; 439. inclined groove; 44. reinforcement head; 441. clamping mouth; 442. reaction plate; 45. stirring blade; 46. rotating shaft; 47. sealing eaves; 5. reinforcement connector; 6. reinforcement groove. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] See also Figure 1 and Figure 2A system for circulating and treating aquaculture wastewater comprises a combined pool 2 equipped with a mobile frame 1, the mobile frame 1 is connected to the combined pool 2 by moving forward and backward (the movement of the mobile frame 1 can be controlled by an external driving source), and a basic scraping frame 3 and a stirring mechanism 4 are installed on the mobile frame 1, the stirring mechanism 4 comprises stirring blades 45, the basic scraping frame 3 and the stirring mechanism 4 are both located in the combined pool 2, and the basic scraping frame 3 is a rectangular structure and is fixedly connected to the mobile frame 1, and at the same time, the left side, the right side and the bottom side of the basic scraping frame 3 are always attached to the inner wall of the combined pool 2 and scrape off the attachments on the inner wall of the combined pool 2 during the movement of the mobile frame 1, the stirring mechanism 4 can change the size of the shear surface of the stirring blade 45, and in the process of wastewater flocculation reaction separation treatment During the process, when the wastewater in the combined pool 2 enters the slow stirring process after the rapid stirring and mixing treatment, the stirring mechanism 4 reduces the destructive force of the stirring blade 45 on the formed flocs during the stirring process by increasing the shear surface of the stirring blade 45, protects the formed flocs, reduces the risk of secondary shearing destroying the flocs, is beneficial to improving the efficiency of subsequent sedimentation, and correspondingly improves the processing capacity and stability of the entire system. In the subsequent discharge process, the stirring mechanism 4 is combined with the basic scraper frame 3 to form a pushing plate, and the pushing plate moves with the moving frame 1 to push the settled flocs, so that the flocs are quickly and fully discharged from the discharge port set on the combined pool 2, which is beneficial to improving the circulation processing capacity and efficiency of the entire system.

[0032] See also Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 8The stirring mechanism 4 also includes a central axis 42 fixedly connected to an outer frame 41, the central axis 42 penetrates the basic scraping frame 3 and is rotatably mounted on the mobile frame 1, the outer frame 41 is located in the basic scraping frame 3 and is provided with a control component 43, a reinforcement head 44 and a plurality of stirring blades 45, the plurality of stirring blades 45 are grouped into a plurality of groups, and the plurality of groups of stirring blades 45 are distributed from top to bottom, and the two stirring blades 45 of each group are symmetrically distributed and the stirring blades 45 symmetrically distributed are respectively located on the left and right sides of the central axis 42, and the left and right sides of the stirring blades 45 are fixedly connected with a rotating shaft 46, and the rotating shaft 46 on one side is rotatably mounted on the outer frame 41, and the rotating shaft 46 on the other side is rotatably mounted on the central axis 42, and the left and right symmetrical stirring blades 45 are relatively The rotating shaft 46 on one side is fixedly connected together, and the control component 43 uniformly controls the rotation of the stirring blade 45 to change the inclination angle of the stirring blade 45 and fix the stirring blade 45 in real time, so that the stirring blade 45 enters the slow mixing process from the rapid mixing process. The shear surface of the stirring blade 45 is increased by changing the inclination angle of the stirring blade 45, and the destructive force of the stirring blade 45 on the already formed flocs is reduced. In the process of discharging, the stirring blade 45 is placed in a vertical state by changing the inclination angle of the stirring blade 45. At this time, a plurality of stirring blades 45, an outer frame 41 and a basic scraper frame 3 are combined to form a stable pushing plate. The pushing plate pushes the settled flocs as the moving frame 1 moves, so that the flocs are quickly and fully discharged from the discharge port set on the combined pool 2.

[0033] See also Figure 2 , Figure 4 and Figure 5 , after the stirring blade 45 rotates to a preset angle, the reinforcement head 44 presses against the rotating shaft 46 to reinforce the stirring blade 45, and the reinforcement head 44 includes a reaction plate 442 provided with a pressing port 441, and the number of the reaction plates 442 is four and they are arranged in groups of two, and the two groups of reaction plates 442 are symmetrically distributed left and right and are respectively located on the left and right sides of the central axis 42, and the two reaction plates 442 in each group are symmetrically distributed front and back and are respectively located on the front and back sides of the rotating shaft 46, wherein the pressing port 441 on the left reaction plate 442 corresponds one-to-one to the rotating shaft 46 on the left, and the pressing port 441 on the right reaction plate 442 corresponds one-to-one to the rotating shaft 46 on the right, and the reaction plate 442 is slidably installed on the outer frame 41 front and back and automatically presses against the rotating shaft 46 under the reaction force of the wastewater during the rotation of the outer frame 41; Figure 4As shown, in the process of the central shaft 42 synchronously driving the outer frame 41 to rotate clockwise, the reaction plate 442 on the right front side is forced to press against the rotating shaft 46 on the right side through the pressing opening 441 thereon. At the same time, the reaction plate 442 on the left rear side is forced to press against the rotating shaft 46 on the left side through the pressing opening 441 thereon. By pressing against the fixed rotating shaft 46, the stability of the stirring blade 45 is increased, which is correspondingly conducive to improving the stability of the entire system, and there is no need to increase the drive, and it is automatically reinforced during the stirring process; in addition, it is also possible to increase the drive control reaction plate 442 to press against the fixed rotating shaft 46 as needed. The rotation of the central shaft 42 is controlled by an external existing drive source.

[0034] See also Figure 2 , Figure 3 , Figure 6 and Figure 7 A reinforcement connector 5 is slidably installed on the basic scraper frame 3. The reinforcement connector 5 is symmetrically distributed on the left and right and is respectively located on the left and right sides of the outer frame 41. The outer frame 41 is provided with reinforcement grooves 6 corresponding to the reinforcement connector 5. When the stirring blade 45, the outer frame 41 and the basic scraper frame 3 are combined to form a stable pushing plate, the reinforcement connector 5 is moved and inserted into the corresponding reinforcement groove 6 to fix the outer frame 41 and the basic scraper frame 3 together, and fill the gap between the outer frame 41 and the basic scraper frame 3. On the one hand, the pushing effect of the pushing plate is improved, and the discharge efficiency is correspondingly improved. On the other hand, the stability of the overall structure is increased, and the stability of the system is correspondingly improved.

[0035] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The control assembly 43 includes a plurality of gears 431, a sliding frame 433 with a plurality of racks 432 installed thereon, and a control screw 434 threadedly connected to the sliding frame 433. The sliding frame 433 is vertically slidably installed on the outer frame 41. The racks 432 correspond to the gears 431 one by one and the racks 432 mesh with the corresponding gears 431. The gears 431 are respectively fixedly installed on the rotating shafts 46 on the left and right sides of the outer frame 41 and the gears 431 are coaxially arranged with the corresponding rotating shafts 46. The control screw 434 is rotatably installed on the top of the outer frame 41. The control screw 434 is rotatably installed on the top of the outer frame 41. The control screw 434 rotates to control the vertical sliding of the sliding frame 433, and the rack 432 synchronously drives the left and right rotating shafts 46 to rotate through the gear 431, thereby uniformly controlling the rotation of the stirring blade 45 and controlling the inclination angle of the stirring blade 45. The threaded connection between the control screw 434 and the sliding frame 433 has a self-locking function, which locks the sliding frame 433 at the current position in real time, and locks the stirring blade 45 accordingly and uniformly. Combined with the reinforcement of the reinforcement head 44, the stability of the stirring blade 45 during operation is fully ensured.

[0036] See also Figure 2 , Figure 3 , Figure 6 and Figure 7 A limit piece 435 is fixedly installed on the sliding frame 433, and the limit pieces 435 are symmetrically distributed on the upper ends of the left and right sides of the sliding frame 433. A vertical sliding piece 436 is installed on the basic scraping frame 3, and the vertical sliding piece 436 is symmetrically distributed on the left and right sides. A pushing piece 437 and a receiving piece 438 are connected to the vertical sliding piece 436. The receiving piece 438 corresponds to the limit piece 435 one by one and is located below the limit piece 435. When the sliding frame 433 moves downward, the stirring blade 45 rotates to change the inclination angle, and the stirring blade 45 rotates to change the inclination angle. When the mixing blade 45 is about to be in a vertical state, the limit member 435 limits the receiving member 438, so that the vertical slide 436 moves downward synchronously with the sliding frame 433, and the pushing member 437 on the vertical slide 436 pushes the reinforcement connecting head 5 to be inserted into the corresponding reinforcement groove 6 during the downward movement, wherein an elastic reset member is connected between the vertical slide 436 and the basic scraper frame 3. When the sliding frame 433 moves upward, the vertical slide 436 moves upward and resets under the action of the rebound force of the elastic reset member.

[0037] See also Figure 3 , Figure 6 and Figure 7 The pushing members 437 are columnar and are in a certain number. The pushing members 437 are distributed on the vertical sliding member 436 from top to bottom and are rotatably connected with the vertical sliding member 436. An inclined groove 439 corresponding to the pushing members 437 is provided on the reinforcement connecting head 5, and the pushing member 437 moves in the corresponding inclined groove 439; in the process that the vertical sliding member 436 drives the pushing member 437 to move downward, the pushing member 437 cooperates with the inclined groove 439 to control the reinforcement connecting head 5 to move toward the outer frame 41 until it is inserted into the corresponding reinforcement groove 6. On the contrary, the vertical sliding member 436 moves upward, and the pushing member 437 cooperates with the inclined groove 439 to control the reinforcement connecting head 5 to reset, wherein the reinforcement groove 6 is arc-shaped, and the surface where the reinforcement connecting head 5 and the reinforcement groove 6 match is also arc-shaped.

[0038] See also Figure 2 , Figure 4 , Figure 6 , Figure 8 and Fig. 9 The stirring blade 45 is in a rectangular plate shape and a blocking eave 47 is provided on the stirring blade 45. When the stirring blade 45 is in a vertical state and is combined with the outer frame 41 and the basic scraper frame 3 to form a stable pushing plate, the blocking eave 47 blocks the gap between the upper and lower adjacent stirring blades 45; Fig. 9 As shown, when the stirring blade 45 is vertical, the blocking eaves 47 are located at the top of the side of the corresponding stirring blade 45 and the blocking eaves 47 are attached to the bottom of the side of the adjacent stirring blade 45 .

[0039] The present invention also provides a method for circulating treatment of aquaculture wastewater, which specifically includes the following steps: S1, rapid mixing: starting the stirring mechanism 4 to rapidly stir the wastewater to which flocculant has been added in the combined pool 2, and moving the movable frame 1 so that the stirring mechanism 4 moves horizontally while rotating, so that the flocculant is rapidly and evenly dispersed in the wastewater.

[0040] S2, slow mixing: after completing step S1, reduce the stirring speed of the stirring mechanism 4 and control the rotation of the stirring blade 45, change the inclination angle of the stirring blade 45 to increase the shear surface of the stirring blade 45, and reduce the destructive force of the stirring blade 45 on the formed flocs.

[0041] S3, static sedimentation: After completing step S2, rotate the stirring blade 45 to change the inclination angle of the stirring blade 45, move the mobile frame 1 to the end of the combined pool 2 to wait for the flocs in the wastewater to settle, and make the stirring blade 45, the outer frame 41 and the basic scraper frame 3 form a stable pushing plate.

[0042] S4, discharging: first discharge the upper layer of liquid, then discharge the precipitated flocs in the lower layer and in the process move the movable frame 1 to make the pushing plate push the flocs to assist in discharging. After the flocs are discharged, reset the stirring mechanism 4 to the state in step S1 and repeat the above process in a cycle.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for circulating and treating aquaculture wastewater, characterized in that: It comprises a combined pool (2) on which a moving frame (1) is installed, a basic scraping frame (3) and a stirring mechanism (4) are installed on the moving frame (1), and the basic scraping frame (3) always moves along the inner wall of the combined pool (2); The stirring mechanism (4) comprises a central shaft (42) fixedly connected to an outer frame (41); the central shaft (42) penetrates through the basic scraping frame (3) and is rotatably mounted on the movable frame (1); the outer frame (41) is located in the basic scraping frame (3); a control component (43), a reinforcement head (44) and a plurality of stirring blades (45) are arranged on the outer frame (41); a rotating shaft (46) is fixedly connected to the stirring blade (45) and the stirring blade (45) is rotatably mounted in the outer frame (41) via the rotating shaft (46); the control component (43) uniformly controls the stirring blade (45) to rotate, change the inclination angle of the stirring blade (45) and fix the stirring blade (45); After the stirring blade (45) rotates to a preset angle, the reinforcing head (44) abuts against the rotating shaft (46) to reinforce the stirring blade (45); A reinforcement connector (5) is slidably provided on the base scraper frame (3), the reinforcement connectors (5) are symmetrically distributed and respectively located on both sides of the outer frame (41), and reinforcement grooves (6) corresponding one to one with the reinforcement connectors (5) are provided on the outer frame (41); The control assembly (43) comprises a gear (431) coaxially and fixedly connected to the rotating shaft (46), a sliding frame (433) equipped with a plurality of racks (432), and a control screw (434) threadedly connected to the sliding frame (433); the racks (432) correspond to the gears (431) one by one and the racks (432) mesh with the corresponding gears (431); the gears (431) are coaxially arranged and fixedly connected to the corresponding rotating shaft (46); the sliding frame (433) is vertically slidably mounted on the outer frame (41) and a limiting member (435) is fixedly mounted on the sliding frame (433); the control screw (434) is rotatably mounted on the outer frame (41); a vertical sliding member (436) is mounted on the basic scraper frame (3); the vertical sliding member (436) is connected to a pushing member (437) and a receiving member (438) located below the limiting member (435); The stirring blade (45) is in the shape of a rectangular plate and is provided with a blocking eave (47). When the stirring blade (45) is in a vertical state and is combined with the outer frame (41) and the basic scraper frame (3) to form a stable pushing plate, the blocking eave (47) blocks the gap between the upper and lower adjacent stirring blades (45).

2. The aquaculture wastewater recycling treatment system according to claim 1 is characterized by: The pushing members (437) are columnar and are in a plurality. The pushing members (437) are distributed on the vertical sliding member (436) from top to bottom and are rotatably connected to the vertical sliding member (436). Inclined grooves (439) corresponding to the pushing members (437) are provided on the reinforcement connector (5), and the pushing members (437) move in the corresponding inclined grooves (439).

3. The aquaculture wastewater recycling treatment system according to claim 1 is characterized by: The reinforcing head (44) comprises a reaction plate (442) provided with a pressing opening (441), the pressing opening (441) corresponds to the rotating shaft (46), the reaction plate (442) is slidably mounted on the outer frame (41) and automatically presses against the rotating shaft (46) when the outer frame (41) rotates due to the reaction force of the wastewater.

4. The aquaculture wastewater recycling treatment system according to claim 3 is characterized by: The stirring blades (45) are divided into a plurality of groups, each of which is composed of two stirring blades. The stirring blades (45) are distributed from top to bottom. The two stirring blades (45) in each group are respectively located on both sides of the central axis (42). The reaction plates (442) are symmetrically distributed and the symmetrically distributed reaction plates (442) form a pressing unit. The pressing units are provided on both sides of the central axis (42). The symmetrical reaction plates (442) in the pressing units are respectively located on both sides of the corresponding side rotating shaft (46). The two reaction plates (442) in the pressing units do not work at the same time. The two reaction plates (442) located on the same side of the rotating shaft (46) in the pressing units on both sides of the central axis (42) do not work at the same time.

5. The aquaculture wastewater recycling treatment system according to claim 1 is characterized by: The reinforcement groove (6) is arc-shaped, and the surface where the reinforcement connector (5) fits with the reinforcement groove (6) is also arc-shaped.

6. A method for circulating treatment of aquaculture wastewater, which is completed by using the system for circulating treatment of aquaculture wastewater according to claim 1, characterized in that: The following steps are involved: S1, rapid mixing: starting the stirring mechanism (4) to rapidly stir the wastewater to which the flocculant has been added in the combined tank (2), and moving the movable frame (1) to make the stirring mechanism (4) move horizontally while rotating, so that the flocculant is rapidly and evenly dispersed in the wastewater; S2, slow mixing: after completing step S1, the stirring speed of the stirring mechanism (4) is reduced and the rotation of the stirring blade (45) is controlled, and the inclination angle of the stirring blade (45) is changed to increase the shear surface of the stirring blade (45) and reduce the destructive force of the stirring blade (45) on the formed flocs; S3, static sedimentation: after completing step S2, the stirring blade (45) is rotated to change the inclination angle of the stirring blade (45), so that the movable frame (1) moves to the end of the combined pool (2) to wait for the flocs in the wastewater to settle, and the stirring blade (45), the outer frame (41) and the basic scraper frame (3) are combined to form a stable pushing plate; S4, discharge: after completing step S3, the upper layer of liquid is discharged first, and then the precipitated flocs in the lower layer are discharged. During this process, the movable frame (1) is moved so that the pushing plate pushes the flocs to assist in the discharge. After the flocs are discharged, the stirring mechanism (4) is reset to the state in step S1 and the aforementioned process is repeated.

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