A fish feed production wastewater treatment device and treatment process

Abstract

The present application discloses a device for treating wastewater from fish feed production and a treatment process. The device comprises a treatment pool, a salvaging mechanism, a rotating shaft and a driving mechanism. A feed inlet is arranged on one side of the treatment pool. A scraper seat and a collecting trough are arranged on the outer wall of the treatment pool away from the feed inlet. The top of the scraper seat is higher than the upper opening of the treatment pool and is provided with an oblique cut surface. The salvaging structure comprises a slide and a filter membrane structure. The rotating shaft is rotatably connected to the scraper seat. The slide is provided with a straight groove slidably connected to the rotating shaft. Card strips are symmetrically arranged on both sides of the outer peripheral surface of the rotating shaft. Card grooves are arranged on the inner walls of the two ends of the straight groove. When the salvaging mechanism is in an initial state, the salvaging mechanism intercepts floating impurities and realizes a stable upward swing under the drive of the driving mechanism. The slide slides down by its own gravity. At this time, the oblique cut surface scrapes off the floating impurities on the surface of the filter membrane structure, thereby achieving the purpose of removing the floating impurities on the surface of the filter membrane structure.

Description

Technical Field

[0001] The present application relates to the field of wastewater treatment, and in particular to a fish feed production wastewater treatment device and treatment process. Background Art

[0002] With the development of the breeding industry, the production wastewater of feed production and processing enterprises has become an increasingly important source of environmental water pollution. Feed production wastewater mainly comes from wastewater generated during feed processing, including equipment, ground washing water, wastewater generated during the production of raw materials and finished products, and production waste gas spray wastewater.

[0003] For this type of wastewater, existing wastewater treatment stations often use coagulation and flotation treatment technology. For this type of wastewater, existing wastewater treatment stations often use coagulation and flotation technology. The coagulation and flotation technology is to add an appropriate amount of coagulant to the wastewater, mix it evenly, and then inject the sewage into the coagulation tank. The coagulation tank is equipped with a stirring system. Under stirring conditions, impurities are coagulated and introduced into the flotation tank together with the wastewater. Then air is introduced into the flotation tank to mix the air and water to form bubbles. The bubbles carry the impurities in the wastewater and rise to the surface to form floating impurities. The flowing wastewater and the floating impurities enter the treatment tank. The two opposite side walls of the treatment tank are provided with a feed port and a discharge port. The wastewater and the floating impurities enter from the feed port and are pumped out of the treatment tank by a water pump to keep the liquid level in the treatment tank stable. A bubble scraper is installed above the treatment tank to remove foam and purify the sewage. The bubble scraper is composed of a scraper bar and a sprocket chain drive structure. The scraper bar is driven by the sprocket chain drive structure to circulate and push the floating impurities on the surface of the wastewater toward the discharge port to continuously remove the floating impurities in the discharge tank.

[0004] Regarding the above-mentioned related technologies, there are the following defects: as the efficiency of coagulation flotation treatment continues to improve, the speed at which floating impurities are generated has also greatly increased. The cleaning method of pushing with scrapers cannot promptly and quickly remove floating impurities, causing floating impurities to accumulate on the surface of wastewater and increase in thickness, making it difficult to clean them all at once with scrapers. As a result, the floating impurities on the bottom layer are redissolved in the wastewater, which in turn affects the efficiency of coagulation flotation treatment. Therefore, there is still room for improvement. Summary of the invention

[0005] In order to improve the cleaning efficiency of floating impurities, the present application provides a fish feed production wastewater treatment device and a treatment process.

[0006] The present application provides a fish feed production wastewater treatment device and treatment process using the following technical solutions:

[0007] A fish feed production wastewater treatment device, comprising:

[0008] A treatment pool, one side of which is provided with a feed inlet for wastewater and floating impurities to enter, and an outer wall of the treatment pool away from the feed inlet is provided with a scraper seat and a collection trough for collecting floating impurities, the scraper seat is located above the collection trough, the top end of the scraper seat is higher than the upper opening of the treatment pool and is provided with a chamfered surface, the inclined lower end of the chamfered surface faces the upper opening of the treatment pool;

[0009] A salvage mechanism, the salvage mechanism is used to salvage floating impurities on the liquid surface of the collection and treatment pool, the salvage structure includes a slide and a filter membrane structure, and the filter membrane structure covers the outside of the slide;

[0010] A rotating shaft, the rotating shaft is rotatably connected to the scraper seat and is arranged horizontally, the slide is provided with a straight groove, the rotating shaft is inserted into the straight groove and is slidably connected to the straight groove, the length direction of the straight groove is perpendicular to the length direction of the rotating shaft, and clamping strips are symmetrically arranged on both sides of the outer circumference of the rotating shaft, and the length direction of the clamping strips is consistent with the length direction of the rotating shaft; the inner walls at both ends of the straight groove are provided with clamping grooves for clamping with the clamping strips; when the salvage mechanism is in an initial state, one end of the slide is clamped with the rotating shaft through the clamping groove and the clamping strip, and the other end of the slide sinks into the wastewater obliquely inserted into the treatment pool;

[0011] The driving mechanism is used to drive the slide to swing upward with the rotating shaft as the axis. During the process of the driving mechanism driving the slide to swing upward, the filter membrane structure salvages floating debris on the liquid surface of the treatment pool; when the slide swings upward by 180°, the end of the slide away from the rotating shaft is tilted upward and parallel to the bevel, and the filter membrane structure at the end of the slide close to the rotating shaft hits the bevel, and the slide slides downward under the action of its own gravity, and the bevel scrapes the floating impurities on the surface of the filter membrane structure until the groove at the inclined upper end of the slide is engaged with the rotating shaft clamping strip, and the salvage mechanism returns to its initial state.

[0012] By adopting the above technical scheme, the slide and the filter membrane structure constitute a salvage mechanism. When the salvage mechanism is in an initial state, part of it sinks into the wastewater, and can intercept floating impurities, so that the floating impurities are accumulated at the filter membrane structure, and the slide achieves the purpose of relative sliding through the slot and the rotating shaft at the scraper seat. When the salvage mechanism is in the initial state, the slide is fixed by the card slot and the card strip on the outer peripheral surface of the rotating shaft, so that the salvage mechanism can be driven by the driving mechanism with the rotating shaft at the scraper seat as the axis to achieve stable upward swing. In this process, the filter membrane structure swings upward accordingly and salvages and removes floating impurities on the wastewater surface. The swinging salvage method has a wide coverage and is conducive to improving the treatment pool. To improve the removal efficiency of floating impurities, when the slide swings upward 180°, the end of the slide away from the rotating shaft is tilted upward and parallel to the beveled surface. At this time, the filter membrane structure at one end of the slide close to the rotating shaft reaches the beveled surface, and then the slide slides down by its own gravity. At this time, the beveled surface scrapes the floating impurities on the surface of the filter membrane structure, thereby achieving the purpose of removing floating impurities on the surface of the filter membrane structure, and the removed floating impurities fall into the collection tank. Since the card strips on both sides of the rotating shaft are symmetrically distributed, after the slide is inserted into the wastewater, the card slot at the inclined upper end of the slide is connected with the card strip of the rotating shaft, so that the salvage mechanism quickly returns to its initial state, which is conducive to cyclic and continuous salvage and is conducive to improving the impurity removal efficiency.

[0013] Preferably, the slide bracket is two slide rods arranged parallel to each other, the slide rods are perpendicular to the rotation axis, the filter membrane structure is two sheet-like filter membrane units, both ends of the filter membrane units are bonded and fixed to the side walls of the two slide rods, the two filter membrane units are placed on both sides of the slide rod, and there is a gap between the two filter membrane units.

[0014] By adopting the above technical solution, two sliding rods are used as slides to reduce the weight of the slides, thereby reducing the load on the driving mechanism. The filter membrane structure is then split into two filter membrane units so that there is a gap between the two filter membrane units to reduce the resistance when the slide sinks, making it easier to use its own gravity to complete the step of positioning the salvage mechanism.

[0015] Preferably, when the salvaging mechanism is in an initial state, the two sliding rods respectively abut against two opposite inner side walls of the treatment pool.

[0016] By adopting the above technical solution, the two sliding rods respectively reach the two inner walls of the treatment pool, thereby expanding the interception range of the salvaging mechanism for floating impurities, which is conducive to salvaging more floating impurities at one time, thereby improving the removal efficiency and effect of the salvaging mechanism.

[0017] Preferably, the driving mechanism includes a driving shaft rotatably connected to the scraper seat, two lifting rod assemblies respectively arranged at both ends of the driving shaft, and a driving member for driving the driving shaft to rotate, the driving shaft is parallel to the rotating axis, the two lifting rod assemblies are disposed on both sides of the scraper seat and correspond one-to-one to the two sliding bars; when the salvage mechanism is in an initial state, the lifting rod assembly is located below the corresponding sliding bar, and when floating impurities are salvaged, the driving member drives the driving shaft to rotate to drive the lifting rod assembly to swing upward, and the lifting rod assembly lifts the sliding bar.

[0018] By adopting the above technical scheme, the two lifting rod assemblies are placed on both sides of the scraper seat, so that the swing of the lifting rod assembly is not hindered by the scraper seat. When the salvage mechanism is in the initial state, the lifting rod assembly is located below the corresponding sliding rod, and the driving member drives the driving shaft to rotate to drive the lifting rod assembly to swing upward, thereby lifting the sliding rod. When the sliding rod swings to an inclined upward and parallel to the bevel surface, the sliding rod slides down and completes the scraping of floating impurities. After the salvage mechanism returns to its initial state, the lifting rod assembly is separated from the sliding rod and can continue to be flipped through the driving member, thereby moving back to under the sliding rod, which is conducive to the smooth operation of the driving mechanism.

[0019] Preferably, the lifting rod assembly includes a connecting rod vertically fixed at the end of the driving shaft and a limiting cylinder arranged at the connecting rod, and the limiting cylinder is parallel to the driving shaft; when the limiting cylinder swings to above the bevel surface, the limiting cylinder limits the sliding rod at the bevel surface until the sliding rod is parallel to the bevel surface, and the sliding rod slides down from the gap between the limiting cylinder and the bevel surface.

[0020] Preferably, the limiting cylinder is rotatably connected to the connecting rod.

[0021] By adopting the above technical scheme, the limit cylinder plays a pushing role in the upward swing of the sliding bar, and when the limit cylinder moves to the bevel surface, the gap between the limit cylinder and the bevel surface changes from small to large, and the sliding bar always has a limiting effect until the sliding bar is parallel to the bevel surface, and the gap between the limit cylinder and the bevel surface meets the requirements for the sliding bar to pass, and the sliding bar slides along the bevel surface. The limit cylinder rotates during the sliding process, which is beneficial to reduce friction and improve stability during the sliding process.

[0022] Preferably, the driving member includes a first synchronous wheel rotatably connected to the scraper seat, a second synchronous wheel rotatably sleeved on the outer circumference of the driving shaft, a motor for driving the first synchronous wheel to rotate, and a synchronous belt sleeved between the first synchronous wheel and the second synchronous wheel.

[0023] By adopting the above technical solution, the motor drives the first synchronous wheel to rotate, and the drive shaft rotates under the meshing transmission of the first synchronous wheel, the second synchronous wheel and the synchronous belt, which is beneficial to improving the stability of the operation of the drive mechanism.

[0024] A fish feed production wastewater treatment process, using a fish feed production wastewater treatment device, comprises the following steps:

[0025] S1: Floating impurities follow the wastewater into the treatment tank from the feed port, the salvage mechanism is in the initial state, and the floating impurities are intercepted;

[0026] S2: Start the driving mechanism, the salvage mechanism swings upward steadily, and the filter membrane structure of the salvage mechanism salvages and removes floating impurities on the wastewater surface. After the slide of the salvage mechanism swings upward 180°, the end of the slide away from the rotating axis is tilted upward and parallel to the bevel, and the filter membrane structure at the end of the slide close to the rotating axis reaches the bevel, and the slide slides down by its own gravity. The bevel scrapes the floating impurities on the surface of the filter membrane structure, and the removed floating impurities fall into the collection tank;

[0027] S3: The slot at the inclined upper end of the slide is engaged with the rotating shaft clip, and the salvage mechanism returns to its initial state;

[0028] S4: Repeat S2 and S3 to continuously remove floating impurities on the surface of the treatment pool.

[0029] By adopting the above technical solution, the salvage mechanism intercepts the floating impurities, causing the floating impurities to accumulate at the filter membrane structure and realize stable upward swing under the drive of the driving mechanism. The swinging salvage method has a wide coverage, which is beneficial to improving the removal efficiency of floating impurities in the treatment pool. Then the slide slides down by its own gravity. At this time, the oblique surface scrapes the floating impurities on the surface of the filter membrane structure, thereby achieving the purpose of removing the floating impurities on the surface of the filter membrane structure. The slide slides down to the initial state, which is beneficial to cyclical and continuous salvage, thereby improving the impurity removal efficiency.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The salvage mechanism intercepts the floating impurities, causing them to accumulate at the filter membrane structure and achieve stable upward swing under the drive of the driving mechanism. The swing salvage method has a wide coverage area, which is conducive to improving the removal efficiency of floating impurities in the treatment pool;

[0032] 2. The sliding frame's own gravity is used to reset the salvage mechanism, and the floating impurities on the surface of the filter membrane structure are scraped off with the help of the oblique surface, thereby achieving the purpose of removing floating impurities on the surface of the filter membrane structure. The sliding frame slides down to the initial state, which is conducive to continuous salvage in a cycle, thereby improving the efficiency of impurity removal;

[0033] 3. The limit cylinder of the lifting rod assembly plays a pushing role during the upward swing of the sliding rod. When the limit cylinder moves to the bevel surface, the gap between the limit cylinder and the bevel surface increases from small to large, and the sliding rod always has a limiting effect until the sliding rod is parallel to the bevel surface. The gap between the limit cylinder and the bevel surface meets the requirements for the sliding rod to pass through. The sliding rod slides along the bevel surface. The limit cylinder rotates during the sliding process, which is beneficial to reduce friction and improve stability during the sliding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the initial state of a salvage mechanism in a fish feed production wastewater treatment device according to an embodiment of the present application.

[0035] Figure 2 It is a schematic diagram of the upper swing state of a salvage mechanism in a fish feed production wastewater treatment device according to an embodiment of the present application.

[0036] Figure 3 It is a schematic diagram of an explosion of a salvage mechanism in a fish feed production wastewater treatment device according to an embodiment of the present application.

[0037] Figure 4 yes Figure 3 A magnified schematic diagram of center A.

[0038] Explanation of the reference numerals: 1. treatment tank; 11. feed inlet; 2. collecting tank; 3. scraper seat; 31. beveled surface; 4. salvaging mechanism; 41. filter membrane structure; 42. slide; 421. straight groove; 422. clamping groove; 5. rotating shaft; 51. clamping strip; 6. driving shaft; 7. driving member; 71. motor; 72. first synchronous wheel; 73. second synchronous wheel; 74. synchronous belt; 8. lifting rod assembly; 81. connecting rod; 82. limiting cylinder; 9. cantilever bracket. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-4 This application is described in further detail.

[0040] The present application embodiment discloses a fish feed production wastewater treatment device, referring to Figure 1 and Figure 2, including a treatment pool 1, a salvaging mechanism 4, a rotating shaft 5 and a driving mechanism. Among them, a feed port 11 for wastewater and floating impurities to enter is provided on one side of the treatment pool 1, and the feed port 11 extends along the width direction of the treatment pool 1, and the floating impurities enter the treatment pool 1 along the length direction of the treatment pool 1. The treatment pool 1 is filled with wastewater, so that when the floating impurities enter the treatment pool 1, the height position of the floating impurities is consistent with the position of the feed port 11, which is conducive to the floating impurities to enter the treatment pool 1 smoothly. A scraper seat 3 and a collection trough 2 for collecting floating impurities are fixed to the outer wall of the treatment pool 1 away from the feed port 11, wherein the scraper seat 3 is located above the collection trough 2. The top end of the scraper seat 3 is higher than the upper end opening of the treatment pool 1 and is provided with a chamfered surface 31, and the inclined lower end of the chamfered surface 31 faces the upper end opening of the treatment pool 1.

[0041] Reference Figure 3 and Figure 4 The salvaging mechanism 4 is used to salvage floating impurities on the liquid surface of the collection treatment pool 1 , wherein the salvaging structure includes a slide 42 and a filter membrane structure 41 , and the filter membrane structure 41 covers the outer side of the slide 42 .

[0042] The rotating shaft 5 is rotatably connected to the top of the scraper seat 3 through the cantilever bracket 9 and is arranged horizontally. In addition, the slide 42 is provided with a straight groove 421, and the rotating shaft 5 is inserted into the straight groove 421 and slidably connected with the straight groove 421. The length direction of the straight groove 421 is perpendicular to the length direction of the rotating shaft 5, and the two sides of the outer circumference of the rotating shaft 5 are symmetrically fixed with clamping strips 51, and the length direction of the clamping strips 51 is consistent with the length direction of the rotating shaft 5. The inner walls at both ends of the straight groove 421 are respectively provided with clamping grooves 422 for clamping with the clamping strip 51. When the salvaging mechanism 4 is in the initial state, one end of the slide 42 is clamped with the rotating shaft 5 through the clamping groove 422 and the clamping strip 51, and the other end of the slide 42 sinks into the wastewater obliquely inserted into the treatment tank 1.

[0043] In this embodiment, the slide 42 is two parallel slide bars, and the length direction of the slide bars is perpendicular to the axis direction of the rotating shaft 5. The straight groove 421 extends along the length direction of the slide bar. There is a gap between the rotating shaft 5 and the beveled surface 31. Under the restriction of the rotating shaft 5, the outer wall of the slide bar is always in contact with the beveled surface 31.

[0044] The filter membrane structure 41 is two parallel sheet-shaped filter membrane units, the two ends of which are bonded and fixed to the side walls of the two slide bars, and the two filter membrane units are placed on both sides of the slide bars, with a gap between the two filter membrane units. When the salvage mechanism 4 is in the initial state, the two slide bars respectively contact the two opposite inner walls of the treatment tank 1. This expands the interception range of the salvage mechanism 4 for floating impurities, which is conducive to salvaging more floating impurities at one time, thereby improving the removal efficiency and effect of the salvage mechanism 4.

[0045] Reference Figure 3 and Figure 4 The driving mechanism includes a driving shaft 6 rotatably connected to the scraper seat 3, two lifting rod assemblies 8 respectively arranged at both ends of the driven shaft 6, and a driving member 7 for driving the driving shaft 6 to rotate. The driving shaft 6 is parallel to the rotating shaft 5. The two lifting rod assemblies 8 are respectively arranged on both sides of the scraper seat 3 and correspond to the two slide bars one by one. The swing of the lifting rod assembly 8 is not hindered by the scraper seat 3. When the salvaging mechanism 4 is in the initial state, the lifting rod assembly 8 is located below the corresponding slide bar. When the floating impurities are salvaged, the driving member 7 drives the driving shaft 6 to rotate to drive the lifting rod assembly 8 to swing upward, and the lifting rod assembly 8 lifts the slide bar.

[0046] In this embodiment, the lifting rod assembly 8 includes a connecting rod 81 vertically fixed to the end of the driving shaft 6 and a limiting cylinder 82 rotatably connected to the connecting rod 81, and the limiting cylinder 82 is parallel to the driving shaft 6. When the limiting cylinder 82 swings to the top of the beveled surface 31, the limiting cylinder 82 limits the sliding rod at the beveled surface 31, until the sliding rod is parallel to the beveled surface 31, and the sliding rod slides down from the gap between the limiting cylinder 82 and the beveled surface 31. The limiting cylinder 82 plays a pushing role in the process of the sliding rod swinging up, and in the process of the limiting cylinder 82 moving to the top of the beveled surface 31, the gap between the limiting cylinder 82 and the beveled surface 31 changes from small to large, which always has a limiting effect on the sliding rod, until the sliding rod is parallel to the beveled surface 31, the gap between the limiting cylinder 82 and the beveled surface 31 meets the requirement for the sliding rod to pass, and the sliding rod slides on the beveled surface 31. The limiting cylinder 82 rotates during the sliding process, which is conducive to reducing friction and improving stability during the sliding process.

[0047] The driving member 7 includes a first synchronous wheel 72 rotatably connected to the scraper seat 3, a second synchronous wheel 73 rotatably sleeved on the outer peripheral surface of the driving shaft 6, a motor 71 for driving the first synchronous wheel 72 to rotate, and a synchronous belt 74 sleeved between the first synchronous wheel 72 and the second synchronous wheel 73. Under the driving action of the motor 71 and the rotation of the first synchronous wheel 72, the driving shaft 6 is rotated under the meshing transmission action of the first synchronous wheel 72, the second synchronous wheel 73 and the synchronous belt 74. In this embodiment, a protective shell (not shown in the figure) is provided on the outer periphery of the driving member 7 to prevent it from being contaminated by floating impurities that fall.

[0048] A fish feed production wastewater treatment process, using a fish feed production wastewater treatment device, comprises the following steps:

[0049] S1: Floating impurities follow the wastewater into the treatment tank 1 from the feed port 11, the salvaging mechanism 4 is in the initial state, and the filter membrane unit at the water-facing surface of the salvaging mechanism 4 intercepts the floating impurities. At this time, the limiting cylinder 82 of the lifting rod assembly 8 is located below the sliding rod.

[0050] S2: Start the motor 71 of the driving mechanism. Under the driving action of the motor 71 and the rotation of the first synchronous wheel 72, the driving shaft 6 is rotated under the meshing transmission action of the first synchronous wheel 72, the second synchronous wheel 73 and the synchronous belt 74. The limit cylinder 82 swings upward following the connecting rod 81, and at the same time, the sliding rod of the salvage mechanism 4 is lifted, so as to achieve the purpose of stable upward swing of the salvage mechanism 4.

[0051] The filter membrane structure 41 of the salvage mechanism 4 salvages and removes floating impurities on the surface of the wastewater. During the upward swing of the slide bar, the limit cylinder 82 plays a pushing role. When the limit cylinder 82 moves to the upper side of the beveled surface 31, the gap between the limit cylinder 82 and the beveled surface 31 changes from small to large. At this time, the gap between the limit cylinder 82 and the beveled surface 31 is still smaller than the overall thickness of the slide bar, so the limit cylinder 82 always plays a limiting effect on the slide bar. After the slide bar of the salvage mechanism 4 swings upward 180°, the end of the slide 42 away from the rotating shaft 5 is tilted upward and parallel to the beveled surface 31. The filter membrane structure 41 at the end of the slide 42 close to the rotating shaft 5 reaches the beveled surface 31. The gap between the limit cylinder 82 and the beveled surface 31 meets the requirements for the slide bar to pass. Under the action of its own gravity, the slide bar slides downward in contact with the beveled surface 31. During the sliding process, the limit cylinder 82 rotates, which is conducive to reducing friction and improving stability during the sliding process.

[0052] When the slide bar slides downward, the beveled surface 31 scrapes off the floating impurities on the surface of the filter membrane unit, and the fallen floating impurities are concentrated in the collecting tank 2, thereby achieving the purpose of removing the floating impurities.

[0053] S3: Since the clips 51 on both sides of the rotating shaft 5 are symmetrically distributed, after the slide bar sinks into the wastewater, the clip groove 422 at the inclined upper end of the slide 42 is clipped with the clips 51 of the rotating shaft 5, and the salvage mechanism 4 returns to the initial state. The motor 71 drives the limit cylinder 82 to continue to swing to the bottom of the slide bar, waiting for the next salvage step of the salvage mechanism 4.

[0054] S4: Repeat S2 and S3 to continuously remove floating impurities on the surface of the treatment pool 1.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fish feed production wastewater treatment device, characterized in that: include: A treatment pool (1), wherein a feed inlet (11) is provided on one side of the treatment pool (1) for wastewater and floating impurities to enter, and a scraper seat (3) and a collection trough (2) for collecting floating impurities are provided on the outer side wall of the treatment pool (1) away from the feed inlet (11), wherein the scraper seat (3) is located above the collection trough (2), and the top end of the scraper seat (3) is located higher than the upper opening of the treatment pool (1) and is provided with a chamfered surface (31), wherein the inclined lower end of the chamfered surface (31) faces the upper opening of the treatment pool (1); A salvaging mechanism (4), the salvaging mechanism (4) being used to salvage floating impurities on the liquid surface of the collection and treatment pool (1), the salvaging mechanism (4) comprising a slide frame (42) and a filter membrane structure (41), the filter membrane structure (41) covering the outside of the slide frame (42); A rotating shaft (5), the rotating shaft (5) is rotatably connected to the scraper seat (3) and is arranged horizontally, the slide (42) is provided with a straight groove (421), the rotating shaft (5) is inserted into the straight groove (421) and is slidably connected to the straight groove (421), the length direction of the straight groove (421) is perpendicular to the length direction of the rotating shaft (5), and clamping strips (51) are symmetrically arranged on both sides of the outer peripheral surface of the rotating shaft (5), and the length direction of the clamping strip (51) is consistent with the length direction of the rotating shaft (5); the inner walls at both ends of the straight groove (421) are provided with clamping grooves (422) for clamping with the clamping strip (51); when the salvaging mechanism (4) is in an initial state, one end of the slide (42) is clamped and matched with the rotating shaft (5) through the clamping groove (422) and the clamping strip (51), and the other end of the slide (42) sinks into the wastewater obliquely inserted into the treatment pool (1); A driving mechanism is provided, wherein the driving mechanism is used to drive the slide (42) to swing upward with the rotating shaft (5) as the axis. During the process of the driving mechanism driving the slide (42) to swing upward, the filter membrane structure (41) salvages floating debris on the liquid surface of the treatment pool (1); when the slide (42) swings upward by 180 degrees, the end of the slide (42) away from the rotating shaft (5) is tilted upward and parallel to the beveled surface (31), and the filter membrane structure (41) at the end of the slide (42) close to the rotating shaft (5) abuts against the beveled surface (31). The slide (42) slides downward under the action of its own gravity, and the beveled surface (31) scrapes floating impurities on the surface of the filter membrane structure (41), until the slot (422) at the inclined upper end of the slide (42) is engaged with the card strip (51) of the rotating shaft (5), and the salvage mechanism (4) is restored to an initial state.

2. A fish feed production wastewater treatment device according to claim 1, characterized in that: The slide frame (42) is two slide bars arranged parallel to each other, and the slide bars are perpendicular to the rotating shaft (5). The filter membrane structure (41) is two sheet-like filter membrane units, and the two ends of the filter membrane units are bonded and fixed to the side walls of the two slide bars. The two filter membrane units are placed on both sides of the slide bar, and there is a gap between the two filter membrane units.

3. A fish feed production wastewater treatment device according to claim 2, characterized in that: When the salvaging mechanism (4) is in an initial state, the two sliding rods respectively abut against two opposite inner side walls of the treatment pool (1).

4. A fish feed production wastewater treatment device according to claim 2, characterized in that: The driving mechanism comprises a driving shaft (6) rotatably connected to the scraper seat (3), two lifting rod assemblies (8) respectively arranged at two ends of the driving shaft (6), and a driving member (7) for driving the driving shaft (6) to rotate, wherein the driving shaft (6) is parallel to the rotating shaft (5), and the two lifting rod assemblies (8) are respectively arranged on both sides of the scraper seat (3) and correspond one to one with the two sliding bars; when the salvaging mechanism (4) is in an initial state, the lifting rod assembly (8) is located below the corresponding sliding bar, and when the floating impurities are salvaged, the driving member (7) drives the driving shaft (6) to rotate to drive the lifting rod assembly (8) to swing upward, and the lifting rod assembly (8) lifts the sliding bar.

5. A fish feed production wastewater treatment device according to claim 4, characterized in that: The lifting rod assembly (8) includes a connecting rod (81) vertically fixed at the end of the driving shaft (6) and a limiting cylinder (82) arranged at the connecting rod (81), and the limiting cylinder (82) is parallel to the driving shaft (6); when the limiting cylinder (82) swings to above the bevel surface (31), the limiting cylinder (82) limits the sliding rod at the bevel surface (31) until the sliding rod is parallel to the bevel surface (31), and the sliding rod slides down from the gap between the limiting cylinder (82) and the bevel surface (31).

6. A fish feed production wastewater treatment device according to claim 5, characterized in that: The limiting cylinder (82) is rotatably connected to the connecting rod (81).

7. A fish feed production wastewater treatment device according to claim 4, characterized in that: The driving member (7) comprises a first synchronous wheel (72) rotatably connected to the scraper seat (3), a second synchronous wheel (73) rotatably sleeved on the outer peripheral surface of the driving shaft (6), a motor (71) for driving the first synchronous wheel (72) to rotate, and a synchronous belt (74) sleeved between the first synchronous wheel (72) and the second synchronous wheel (73).

8. A fish feed production wastewater treatment process, using a fish feed production wastewater treatment device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Floating impurities follow the wastewater into the treatment tank (1) from the feed port (11), the salvaging mechanism (4) is in the initial state, and the floating impurities are intercepted; S2: starting the driving mechanism, the salvaging mechanism (4) swings upward steadily, and the filter membrane structure (41) of the salvaging mechanism (4) salvages and removes floating impurities on the wastewater surface. After the slide (42) of the salvaging mechanism (4) swings upward 180 degrees, the end of the slide (42) away from the rotating shaft (5) tilts upward and is parallel to the beveled surface (31). The filter membrane structure (41) at the end of the slide (42) close to the rotating shaft (5) abuts against the beveled surface (31). The slide (42) slides down by its own gravity, and the beveled surface (31) scrapes the floating impurities on the surface of the filter membrane structure (41). The removed floating impurities fall into the collection tank (2). S3: the slot (422) at the inclined upper end of the slide (42) is engaged with the clip (51) of the rotating shaft (5), and the salvaging mechanism (4) is restored to the initial state; S4: Repeat S2 and S3 to continuously remove floating impurities on the surface of the treatment pool (1).

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