A microfiltration pretreatment device for phosphorus-containing wastewater

Abstract

The present invention belongs to the technical field of phosphorus-containing wastewater treatment, and specifically is a microfiltration pretreatment device for phosphorus-containing wastewater, comprising a sewage pool, a water inlet pipe for discharging phosphorus-containing wastewater is arranged at the top of the sewage pool, a drainage pipe is arranged at the other end of the sewage pool, a sub-screen is arranged below the drainage pipe, a storage box for storing a dephosphorizing agent is fixedly installed at the top of the sewage pool, a discharge pipe is fixedly installed at the bottom of the storage box, a water control component is arranged inside the sewage pool, and is used to discharge the dephosphorizing agent through the discharge pipe through the flow control of the phosphorus-containing wastewater, a transmission cylinder is rotatably installed inside the sewage pool, a filter frame is fixedly installed on the outer wall of the transmission cylinder, a second filter screen is arranged inside the filter frame, a conveying cylinder connected to the filter frame is arranged inside the transmission cylinder, one end of the conveying cylinder extends out of the outer wall of the sewage pool, and a collecting box is arranged outside the sewage pool. The coordinated use of the above structures can effectively improve the treatment efficiency of phosphorus-containing wastewater.

Description

Technical Field

[0001] The invention belongs to the technical field of phosphorus-containing wastewater treatment, in particular to a microfiltration pretreatment device for phosphorus-containing wastewater. Background Art

[0002] Phosphorus-containing wastewater refers to wastewater containing the element phosphorus, which mainly comes from industrial production, agricultural activities and domestic sewage. These wastewaters usually have high phosphorus concentrations and complex components. Excessive phosphorus is one of the main factors of eutrophication of water bodies, which can lead to excessive growth of algae and other aquatic plants, and then cause water quality deterioration and ecological imbalance.

[0003] When treating wastewater containing phosphates, a commonly used method is chemical precipitation. Phosphorus removal agents (such as calcium salts, iron salts, aluminum salts, etc.) are added to the wastewater. These chemicals react chemically with the phosphates in the wastewater to generate water-insoluble phosphate precipitates, which are separated from the wastewater by standing still for further centralized treatment. In addition, these precipitates are directly salvaged through manual tools. Although the above methods are simple and effective, both static sedimentation treatment and manual salvage require a lot of time, which leads to low efficiency in the treatment of phosphorus-containing wastewater.

[0004] To this end, the present invention provides a microfiltration pretreatment device for phosphorus-containing wastewater. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the microfiltration pretreatment device for phosphorus-containing wastewater of the present invention comprises a sewage pool, a water inlet pipe for discharging phosphorus-containing wastewater is arranged at the top of the sewage pool, a drainage pipe is arranged at the other end of the sewage pool, and a sub-screen is arranged below the drainage pipe;

[0007] A storage box for storing the dephosphorization agent is fixedly installed at the top of the sewage pool, a discharge pipe is fixedly installed at the bottom of the storage box, and a water control component is arranged inside the sewage pool to discharge the dephosphorization agent through the discharge pipe through the flow control of the phosphorus-containing wastewater;

[0008] A transmission cylinder is rotatably installed inside the sewage pool, a filter frame is fixedly installed on the outer wall of the transmission cylinder, a second filter screen is arranged inside the filter frame, a conveying cylinder connected to the filter frame is arranged inside the transmission cylinder, one end of the conveying cylinder extends out of the outer wall of the sewage pool, a collection box is arranged outside the sewage pool, and a conveying auger is arranged inside the conveying cylinder;

[0009] A rotating assembly is arranged inside the sewage tank to control the rotation of the transmission cylinder.

[0010] The water control assembly includes a push rod, a rotating rod, a water wheel blade and a pressing cam for pressing the push rod. The push rod is elastically installed inside the discharge pipe. A piston for sealing the discharge pipe is fixedly installed on the top of the push rod. The diameter of the push rod is smaller than the diameter of the discharge pipe. The rotating rod is rotatably installed below the sub-screen. The water wheel blade and the pressing cam are fixedly installed on the outer wall of the rotating rod.

[0011] The rotating assembly includes a driving motor, a rotating shaft, a turntable and a clamping rod. The driving motor is fixedly installed on the outer wall of the sewage pool. One end of the rotating shaft is fixedly connected to the output shaft of the driving motor, and the other end of the rotating shaft is fixedly connected to the turntable. The clamping rod is arranged inside the transmission cylinder. A protrusion is fixedly installed on the bottom end of the clamping rod. A clamping groove for inserting the protrusion is opened on the outer wall of the turntable.

[0012] The conveying cylinder is fixedly connected to the interior of the sewage tank, and the output shaft of the conveying auger extends to the inner wall of the transmission cylinder and is fixedly connected to the interior of the transmission cylinder.

[0013] The outer wall of the transmission cylinder is provided with a first opening, one end of the filter frame close to the transmission cylinder is provided with a third opening, the first opening corresponds to the third opening, and the top of the conveying cylinder is provided with a second opening.

[0014] A gravity scraper block is slidably installed inside the filter frame, one end of the gravity scraper block is in contact with the outer wall of the second filter screen, and an inclined guide block is fixedly installed at a position near the third opening in the filter frame.

[0015] A baffle is provided on the side wall of the filter frame, and a top rod corresponding to the mesh size of the second filter screen is provided at one end of the baffle close to the second filter screen. A sliding rod is fixedly installed on the side wall of the baffle, and one end of the sliding rod extends to the interior of the filter frame. A reset spring is provided between the sliding rod and the filter frame.

[0016] The clamping rod is elastically installed inside the transmission cylinder, and an inclined guide ring is fixedly installed inside the sewage pool. The inclined guide ring is semicircular, and both ends of the inclined guide ring are inclined. The inclined guide ring is set below the liquid surface, and a control ring is rotatably installed inside the sewage pool. A push block for pushing the clamping rod is fixedly installed on the inner wall of the control ring.

[0017] A driving wheel is fixedly installed on the outer wall of the rotating shaft, a driven wheel is rotatably installed inside the sewage tank, the driving wheel and the driven wheel are connected by a belt, a transmission gear is fixedly installed on the side wall of the driven wheel, a gear ring is fixedly installed on the inner wall of the control ring, and the transmission gear is meshed with the gear ring.

[0018] A first filter screen is rotatably installed inside the filter frame. The upper and lower ends of the first filter screen are made of magnetic materials. A counterweight block is fixedly installed on the outer wall of the bottom end of the first filter screen. An arc-shaped magnetic plate for adsorbing the first filter screen is fixedly installed inside the sewage pool. The arc-shaped magnetic plate is arranged directly below the transmission cylinder.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The microfiltration pretreatment device for phosphorus-containing wastewater described in the present invention performs preliminary filtration on the phosphorus-containing wastewater through the arranged sub-screen, and then the wastewater flowing out through the sub-screen impacts the water wheel blades to rotate the rotating rod, at which time the top pressure cam pushes the push rod to release the blockage of the inside of the discharge pipe, and the dephosphorization agent flows out through the discharge pipe, and mixes and reacts with the phosphate precipitate in the sewage pool to generate water-insoluble phosphate precipitate, and the driving motor drives the transmission cylinder to rotate clockwise, so that the filter frame and the second filter screen salvage the phosphate precipitate in the water, and cooperates with the conveying cylinder and the conveying auger to transport the salvaged phosphate precipitate to the inside of the collection box, so that the treatment efficiency of phosphorus-containing wastewater can be improved without human intervention.

[0021] 2. The microfiltration pretreatment device for phosphorus-containing wastewater described in the present invention drives the filter frame to rotate below the liquid surface of the wastewater through the transmission cylinder, and pushes the clamping rod along the outside of the inclined guide ring through the push block to make it out of the control of the turntable. At this time, the rotation speed of the transmission cylinder will be synchronized with the control ring, thereby slowing down the rotation speed of the filter frame below the liquid surface of the wastewater, thereby improving the efficiency of the second filter screen in salvaging phosphate precipitates underwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a stereogram in the present invention;

[0024] Figure 2 It is a structural schematic diagram of the filter frame in the present invention;

[0025] Figure 3 The present invention Figure 2 A in the enlarged view;

[0026] Figure 4 It is a structural schematic diagram of the collection box in the present invention;

[0027] Figure 5 The present invention Figure 4 The enlarged view of point B in the figure;

[0028] Figure 6 It is a structural schematic diagram of the first filter screen in the present invention;

[0029] Figure 7 The present invention Figure 6 The enlarged view of point C in the figure;

[0030] Figure 8 The present invention Figure 6 The enlarged view of point D in the figure;

[0031] Fig. 9It is a structural schematic diagram of the conveying auger in the present invention;

[0032] Fig.10 It is a structural schematic diagram of the baffle in the present invention.

[0033] In the figure: 1. sewage pool; 2. sub-screen; 3. storage box; 4. collection box; 5. transmission cylinder; 6. filter frame; 7. driving motor; 8. discharge pipe; 9. push rod; 10. rotating rod; 11. water wheel blade; 12. top pressure cam; 13. arc magnetic plate; 14. first filter; 15. driving wheel; 16. driven wheel; 17. control ring; 18. gear ring; 19. transmission gear; 20. push block; 21. turntable; 22. clamping rod; 23. inclined guide ring; 24. counterweight block; 25. second filter; 26. baffle; 27. slide rod; 28. gravity scraper block; 29. ​​inclined guide block; 30. conveying cylinder; 31. conveying auger; 32. first opening; 33. second opening; 34. rotating shaft; 35. third opening. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figures 1 to 10 As shown, a microfiltration pretreatment device for phosphorus-containing wastewater according to an embodiment of the present invention comprises a sewage pool 1, a water inlet pipe for discharging phosphorus-containing wastewater is arranged at the top of the sewage pool 1, a drain pipe is arranged at the other end of the sewage pool 1, and a sub-screen 2 is arranged below the drain pipe;

[0036] The phosphorus-containing wastewater is transported to the interior of the sewage pool 1 through the water inlet pipe, and then the phosphorus-containing wastewater is preliminarily filtered through the set sub-screen 2, which can filter out the debris in the phosphorus-containing wastewater, and the wastewater with reduced phosphorus content can be discharged through the drain pipe.

[0037] A storage box 3 for storing the dephosphorizing agent is fixedly installed at the top of the sewage pool 1, a discharge pipe 8 is fixedly installed at the bottom of the storage box 3, and a water control component is arranged inside the sewage pool 1 to discharge the dephosphorizing agent through the discharge pipe 8 through the flow control of the phosphorus-containing wastewater;

[0038] The storage box 3 is arranged above the sub-screen 2. When the phosphorus-containing wastewater passes through the sub-screen 2 and enters the interior of the sewage pool 1, if the discharge pipe 8 is controlled to discharge the dephosphorization agent into the sewage pool 1, it will mix and react with the phosphorus-containing wastewater and form water-insoluble phosphate precipitates in the sewage pool 1.

[0039] A transmission cylinder 5 is rotatably installed inside the sewage pool 1, a filter frame 6 is fixedly installed on the outer wall of the transmission cylinder 5, a second filter screen 25 is arranged inside the filter frame 6, a conveying cylinder 30 connected to the filter frame 6 is arranged inside the transmission cylinder 5, one end of the conveying cylinder 30 extends out of the outer wall of the sewage pool 1, a collection box 4 is arranged outside the sewage pool 1, and a conveying auger 31 (such as Fig. 9 As shown in the figure, a rotating assembly is arranged inside the sewage pool 1 to control the rotation of the transmission cylinder 5.

[0040] By controlling the transmission cylinder 5 to rotate clockwise through the provided rotating assembly, the filter frame 6 can be driven to rotate in the sewage pool 1, and then the phosphate precipitate in the wastewater can be salvaged through the second filter screen 25 provided inside the filter frame 6, wherein the length of the filter frame 6 can be the width of the sewage pool 1, which helps to improve the salvage efficiency. When the filter frame 6 is transferred out of the wastewater, the phosphate precipitate retained in the filter frame 6 or on the second filter screen 25 will flow into the conveying cylinder 30 (the conveying cylinder 30 is preferably arranged above the liquid surface) under the action of the water flow, and finally the phosphate precipitate is transported to the interior of the collecting box 4 (the outlet of the conveying cylinder 30 is located above the collecting box 4) through the conveying auger 31 provided in the conveying cylinder 30.

[0041] As a preferred embodiment of the present invention, the water control component includes a push rod 9, a rotating rod 10, a water wheel blade 11 and a pressing cam 12 for pressing the push rod 9. The push rod 9 is elastically installed inside the discharge pipe 8. A piston for blocking the discharge pipe 8 is fixedly installed on the top of the push rod 9. The diameter of the push rod 9 is smaller than the diameter of the discharge pipe 8. The rotating rod 10 is rotatably installed below the sub-screen 2. The water wheel blade 11 and the pressing cam 12 are both fixedly installed on the outer wall of the rotating rod 10.

[0042] The rotating rod 10 is arranged below the sub-screen 2, so that the wastewater flowing out through the sub-screen 2 can directly impact the blades of the water wheel blades 11, and the water wheel blades 11 drive the rotating rod 10 to rotate through the impact force of the wastewater flow. The top pressure cam 12 is arranged directly below the push rod 9. When the rotating rod 10 rotates, it will drive the top pressure cam 12 to rotate until it rotates to the bottom of the push rod 9. At this time, the top pressure cam 12 will push the bottom of the push rod 9 upward, so that the piston moves upward and releases the blockage of the inside of the discharge pipe 8. At this time, the dephosphorization agent inside the storage box 3 will flow out through the discharge pipe 8, and mix and react with the phosphate precipitate in the sewage pool 1 to generate a water-insoluble phosphate precipitate.

[0043] A connecting spring is arranged between the top of the push rod 9 and the top end of the discharge pipe 8. The connecting spring can enable the piston to always maintain the tendency to block the discharge pipe 8. The piston at the top of the push rod 9 is arranged in a T shape, which is convenient for blocking the inner cavity of the discharge pipe 8, and the setting of the connecting spring will not affect the blocking effect.

[0044] As a preferred embodiment of the present invention, the rotating assembly includes a driving motor 7, a rotating shaft 34, a turntable 21 and a clamping rod 22. The driving motor 7 is fixedly mounted on the outer wall of the sewage pool 1, one end of the rotating shaft 34 is fixedly connected to the output shaft of the driving motor 7, and the other end of the rotating shaft 34 is fixedly connected to the turntable 21. The clamping rod 22 is arranged inside the transmission cylinder 5, and a protrusion is fixedly mounted on the bottom end of the clamping rod 22. The outer wall of the turntable 21 is provided with a clamping groove for inserting the protrusion.

[0045] When the driving motor 7 is started, it will drive the rotating shaft 34 to rotate. At this time, the turntable 21 fixedly connected to the rotating shaft 34 will also rotate synchronously. Since the protrusion at the bottom of the clamping rod 22 is engaged with the clamping groove provided on the outer wall of the turntable 21, when the turntable 21 rotates, it will drive the transmission cylinder 5 to rotate clockwise through the clamping rod 22 at the same time. At this time, the transmission cylinder 5 will drive the filter frame 6 and the second filter screen 25 to salvage the phosphate precipitate in the water, and cooperate with the conveying cylinder 30 and the conveying auger 31 to transport the salvaged phosphate precipitate to the inside of the collecting box 4, so as to effectively salvage the phosphate precipitate in the wastewater, and finally discharge the wastewater through the drain pipe. No human intervention is required, which can improve the treatment efficiency of phosphorus-containing wastewater.

[0046] As a preferred embodiment of the present invention, the conveying cylinder 30 is fixedly connected to the interior of the sewage pool 1 , and the output shaft of the conveying auger 31 extends to the inner wall of the transmission cylinder 5 and is fixedly connected to the interior of the transmission cylinder 5 .

[0047] When the driving motor 7 drives the transmission cylinder 5 to rotate, since the conveying cylinder 30 is fixedly connected to the inside of the sewage tank 1, the transmission cylinder 5 will rotate around the outside of the conveying cylinder 30 without driving the conveying cylinder 30 to rotate, and since the transmission cylinder 5 is fixedly connected to the output shaft of the conveying auger 31, when the transmission cylinder 5 rotates, it will drive the conveying auger 31 to rotate inside the conveying cylinder 30, thereby facilitating the transportation of the phosphate precipitate entering the conveying cylinder 30.

[0048] As a preferred embodiment of the present invention, a first opening 32 is formed on the outer wall of the transmission cylinder 5 , a third opening 35 is formed on one end of the filter frame 6 close to the transmission cylinder 5 , the first opening 32 corresponds to the third opening 35 , and a second opening 33 is formed on the top of the conveying cylinder 30 .

[0049] The transmission cylinder 5 and the filter frame 6 are connected through the first opening 32 and the third opening 35, so the phosphate precipitate salvaged in the filter frame 6 can enter the interior of the first opening 32 through the third opening 35. Since the second opening 33 is located at the top of the conveying cylinder 30, only when the transmission cylinder 5 drives the filter frame 6 to rotate upward, the phosphate precipitate inside the filter frame 6 can enter the interior of the second opening 33 through the first opening 32 and the third opening 35, and then the salvaged phosphate precipitate can be transported by the conveying auger 31, wherein a plurality of filter frames 6 are provided, and the plurality of filter frames 6 are arranged in a ring shape on the outer wall of the transmission cylinder 5, and the structures inside the plurality of filter frames 6 are consistent.

[0050] As a preferred embodiment of the present invention, a gravity scraper block 28 is slidably installed inside the filter frame 6, one end of the gravity scraper block 28 is in contact with the outer wall of the second filter screen 25, and an inclined guide block 29 is fixedly installed near the third opening 35 in the filter frame 6.

[0051] The gravity scraper 28 is always located below the filter frame 6 under the action of gravity. When the transmission cylinder 5 drives the filter frame 6 to rotate upward, the gravity scraper 28 will slide downward along the outer wall of the second filter screen 25 under the action of gravity, and the phosphate precipitate attached to the second filter screen 25 can be scraped off. When the gravity scraper 28 slides downward under the action of gravity, the phosphate precipitate on the second filter screen 25 will be pushed toward the third opening 35. The inclined guide block 29 arranged on one side of the third opening 35 can guide the phosphate precipitate scraped from the second filter screen 25 to the second opening 33, which is convenient for the conveying auger 31 to convey the phosphate precipitate to the collection box 4, thereby efficiently reducing the phosphorus component in the phosphorus-containing wastewater.

[0052] As a preferred embodiment of the present invention, the side wall of the filter frame 6 is provided with a baffle 26, and one end of the baffle 26 close to the second filter screen 25 is provided with a top rod corresponding to the mesh hole of the second filter screen 25, and the side wall of the baffle 26 is fixedly installed with a slide rod 27 (such as Figure 7 As shown in the figure, one end of the slide rod 27 extends to the inside of the filter frame 6, and a return spring is arranged between the slide rod 27 and the filter frame 6.

[0053] The baffle 26, under the action of elasticity, will keep the push rod in the mesh holes of the second filter screen 25 at all times, and the mesh holes can be blocked. At this time, the second filter screen 25 cannot allow water to pass through. When the transmission cylinder 5 drives the filter frame 6 to rotate below the liquid surface of the phosphorus-containing wastewater, the rotation of the filter frame 6 will be subject to a certain resistance. Under the action of water resistance, the baffle 26 will be pushed away from the second filter screen 25, and the wastewater that penetrates the second filter screen 25 will pass through the gap between the second filter screen 25 and the baffle 26, so that when the filter frame 6 moves, the phosphate precipitates in the wastewater are prevented from being pushed away to both sides, thereby ensuring the salvage effect of the second filter screen 25 on the phosphate precipitates.

[0054] When the filter frame 6 is turned out of the wastewater, the baffle 26 that has lost its resistance will drive the push rod to re-enter the mesh of the second filter screen 25 under the action of the reset spring, which can effectively push out the phosphate precipitates stuck in the mesh, so that the phosphate precipitates are retained on the surface of the second filter screen 25, which can facilitate the gravity scraper 28 to remove the phosphate precipitates retained on the surface of the second filter screen 25.

[0055] As a preferred embodiment of the present invention, the clamping rod 22 is elastically installed inside the transmission cylinder 5 (such as Figure 5 As shown), an inclined guide ring 23 is fixedly installed inside the sewage pool 1. The inclined guide ring 23 is semicircular. Both ends of the inclined guide ring 23 are inclined. The inclined guide ring 23 is set below the liquid surface. A control ring 17 is rotatably installed inside the sewage pool 1. A push block 20 for pushing the clamping rod 22 is fixedly installed on the inner wall of the control ring 17.

[0056] One end of the clamping rod 22 extends to the inside of the transmission cylinder 5, and a pressure spring is arranged between the top of the clamping rod 22 and the inside of the transmission cylinder 5. The pressure spring can keep the clamping rod 22 in the tendency of being engaged with the outer wall of the turntable 21. When the transmission cylinder 5 drives the filter frame 6 to rotate below the liquid level of the wastewater, the clamping rod 22 will also rotate to the same position under the action of the turntable 21. At this time, one end of the clamping rod 22 will contact one end of the inclined guide ring 23. At this time, the control ring 17 The clockwise rotation (the specific principle will be explained later) drives the push block 20 to push the clamping rod 22. At this time, the clamping rod 22 will slide along the outer wall of the inclined guide ring 23 and gradually move away from the outer wall of the turntable 21. At the same time, the top pressure spring will also deform and store elastic potential energy. When the clamping rod 22 moves away from the turntable 21, the rotation of the transmission cylinder 5 will not be controlled by the turntable 21. The transmission cylinder 5 will rotate under the push of the push block 20, and the rotation speed of the transmission cylinder 5 will also be synchronized with the control ring 17.

[0057] As a preferred embodiment of the present invention, a driving wheel 15 is fixedly installed on the outer wall of the rotating shaft 34, a driven wheel 16 is rotatably installed inside the sewage pool 1, the driving wheel 15 and the driven wheel 16 are connected by a belt, a transmission gear 19 is fixedly installed on the side wall of the driven wheel 16, a gear ring 18 is fixedly installed on the inner wall of the control ring 17, and the transmission gear 19 is meshed with the gear ring 18.

[0058] When the driving motor 7 rotates, it drives the rotating shaft 34 to rotate and also drives the driving wheel 15 to rotate. Under the action of the belt, it drives the driven wheel 16 to rotate. At this time, the transmission gear 19 installed on the driven wheel 16 drives the gear ring 18 to rotate, thereby realizing the rotation of the control ring 17. Since the number of teeth on the transmission gear 19 is less than that on the gear ring 18, a differential speed will be generated between the transmission gear 19 and the gear ring 18, which will make the rotation speed of the control ring 17 lower than that of the turntable 21. When the filter frame 6 rotates below the liquid surface of the wastewater, the rotation speed can be slowed down. Since the moving speed is slowed down, the efficiency of the second filter screen 25 in salvaging phosphate sediments underwater will be improved.

[0059] As a preferred embodiment of the present invention, a first filter screen 14 is rotatably installed inside the filter frame 6, and the upper and lower ends of the first filter screen 14 are made of magnetic materials. A counterweight block 24 is fixedly installed on the outer wall of the bottom end of the first filter screen 14, and an arc-shaped magnetic plate 13 for adsorbing the first filter screen 14 is fixedly installed inside the sewage pool 1, and the arc-shaped magnetic plate 13 is arranged directly below the transmission cylinder 5.

[0060] The trajectory of the arc-shaped magnetic plate 13 is also such that the filter frame 6 will come into contact with the arc-shaped magnetic plate 13 only when the filter frame 6 rotates below the liquid surface of the wastewater.

[0061] When the filter frame 6 rotates to within the range of the arc-shaped magnetic plate 13, the arc-shaped magnetic plate 13 will absorb the first filter screen 14, so that the bottom end of the first filter screen 14 is almost in contact with the bottom end of the filter frame 6, and when the filter frame 6 slides on the track of the arc-shaped magnetic plate 13, the first filter screen 14 will be in a vertical state on the filter frame 6 (such as Figure 6 As shown), the phosphate precipitate in the wastewater can be effectively salvaged. When the filter frame 6 drives the first filter screen 14 away from the direction of the arc-shaped magnetic plate 13, the first filter screen 14 is not affected by the magnetic force and will be perpendicular to the center of the earth under the action of the counterweight 24. When the filter frame 6 drives the first filter screen 14 to contact the arc-shaped magnetic plate 13 again, the first filter screen 14 will rotate 180 degrees inside the filter frame 6 under the cooperation of the counterweight 24 and the magnetic force. When the phosphate precipitate in the wastewater is salvaged again, the back of the first filter screen 14 will be backwashed, and the phosphate precipitate salvaged last time can be flushed into the filter frame 6, so that the salvaged phosphate precipitate can be sent to the inside of the conveying tube 30.

[0062] Working principle: phosphorus-containing wastewater is transported to the interior of the sewage pool 1 through the water inlet pipe, and then the phosphorus-containing wastewater is preliminarily filtered through the set sub-screen 2. The wastewater flowing out of the sub-screen 2 impacts the blades of the water wheel 11 to drive the rotating rod 10 to rotate. At this time, the top pressure cam 12 will push the bottom of the push rod 9 upward, so that the piston moves upward and releases the blockage of the inside of the discharge pipe 8. The phosphorus removal agent will flow out through the discharge pipe 8 and mix and react with the phosphate precipitate in the sewage pool 1 to generate water-insoluble phosphate precipitate. The rotating shaft 34 is driven to rotate by the driving motor 7. At this time, the rotating shaft 34 is fixedly connected to the rotating shaft 34. The connected turntable 21 will also rotate synchronously, and the driving cylinder 5 will be driven to rotate clockwise through the clamping rod 22 at the same time. The driving cylinder 5 will drive the filter frame 6 and the second filter screen 25 to salvage the phosphate precipitate in the water. The phosphate precipitate inside the filter frame 6 enters the interior of the second opening 33 through the first opening 32 and the third opening 35, and cooperates with the conveying cylinder 30 and the conveying auger 31 to transport the salvaged phosphate precipitate to the interior of the collecting box 4, which can effectively salvage the phosphate precipitate in the wastewater, and finally discharge the wastewater through the drain pipe. Without human intervention, the treatment efficiency of phosphorus-containing wastewater can be improved.

[0063] When the transmission cylinder 5 drives the filter frame 6 to rotate below the liquid surface of the wastewater, the push block 20 is driven to push the clamping rod 22 through the clockwise rotation of the control ring 17. At this time, the clamping rod 22 will slide along the outer wall of the inclined guide ring 23 and gradually move away from the outer wall of the turntable 21. At the same time, the top pressure spring will also deform and store elastic potential energy. When the clamping rod 22 is away from the turntable 21, the rotation of the transmission cylinder 5 is not controlled by the turntable 21. The transmission cylinder 5 will rotate under the push of the push block 20, and the rotation speed of the transmission cylinder 5 will also be synchronized with the control ring 17. When the filter frame 6 rotates below the liquid surface of the wastewater, the rotation speed can be slowed down to improve the efficiency of the second filter screen 25 in salvaging phosphate precipitates underwater.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A microfiltration pretreatment device for phosphorus-containing wastewater, comprising a sewage pool (1), wherein a water inlet pipe for discharging phosphorus-containing wastewater is arranged at the top of the sewage pool (1), a drainage pipe is arranged at the other end of the sewage pool (1), and a sub-screen (2) is arranged below the drainage pipe; Features: A storage box (3) for storing a dephosphorizing agent is fixedly mounted on the top of the sewage pool (1), a discharge pipe (8) is fixedly mounted on the bottom of the storage box (3), and a water control component is arranged inside the sewage pool (1) for controlling the discharge pipe (8) to discharge the dephosphorizing agent through the flow rate of the phosphorus-containing wastewater; A transmission cylinder (5) is rotatably mounted inside the sewage pool (1), a filter frame (6) is fixedly mounted on the outer wall of the transmission cylinder (5), a second filter screen (25) is arranged inside the filter frame (6), a conveying cylinder (30) which is in communication with the filter frame (6) is arranged inside the transmission cylinder (5), one end of the conveying cylinder (30) extends out of the outer wall of the sewage pool (1), a collecting box (4) is arranged outside the sewage pool (1), and a conveying auger (31) is arranged inside the conveying cylinder (30); A rotating assembly is provided inside the sewage pool (1) for controlling the rotation of the transmission cylinder (5); The rotating assembly comprises a driving motor (7), a rotating shaft (34), a rotating disk (21) and a clamping rod (22); the driving motor (7) is fixedly mounted on the outer wall of the sewage pool (1); one end of the rotating shaft (34) is fixedly connected to the output shaft of the driving motor (7); the other end of the rotating shaft (34) is fixedly connected to the rotating disk (21); the clamping rod (22) is arranged inside the transmission cylinder (5); a protrusion is fixedly mounted on the bottom end of the clamping rod (22); and a clamping groove for inserting the protrusion is provided on the outer wall of the rotating disk (21); The clamping rod (22) is elastically mounted inside the transmission cylinder (5); an inclined guide ring (23) is fixedly mounted inside the sewage pool (1); the inclined guide ring (23) is semicircular; both ends of the inclined guide ring (23) are inclined; the inclined guide ring (23) is arranged below the liquid surface; a control ring (17) is rotatably mounted inside the sewage pool (1); a push block (20) for pushing the clamping rod (22) is fixedly mounted on the inner wall of the control ring (17); A driving wheel (15) is fixedly mounted on the outer wall of the rotating shaft (34); a driven wheel (16) is rotatably mounted inside the sewage tank (1); the driving wheel (15) and the driven wheel (16) are connected via a belt; a transmission gear (19) is fixedly mounted on the side wall of the driven wheel (16); a toothed ring (18) is fixedly mounted on the inner wall of the control ring (17); and the transmission gear (19) meshes with the toothed ring (18).

2. A microfiltration pretreatment device for phosphorus-containing wastewater according to claim 1, characterized in that: The water control component comprises a push rod (9), a rotating rod (10), a water wheel blade (11) and a pressing cam (12) for pressing the push rod (9); the push rod (9) is elastically mounted inside a discharge pipe (8); a piston for blocking the discharge pipe (8) is fixedly mounted on the top of the push rod (9); the diameter of the push rod (9) is smaller than the diameter of the discharge pipe (8); the rotating rod (10) is rotatably mounted below the sub-screen (2); and the water wheel blade (11) and the pressing cam (12) are both fixedly mounted on the outer wall of the rotating rod (10).

3. The microfiltration pretreatment device for phosphorus-containing wastewater according to claim 1, characterized in that: The conveying cylinder (30) is fixedly connected to the interior of the sewage tank (1), and the output shaft of the conveying auger (31) extends to the inner wall of the transmission cylinder (5) and is fixedly connected to the interior of the transmission cylinder (5).

4. A microfiltration pretreatment device for phosphorus-containing wastewater according to claim 3, characterized in that: The outer wall of the transmission cylinder (5) is provided with a first opening (32), the end of the filter frame (6) close to the transmission cylinder (5) is provided with a third opening (35), the first opening (32) corresponds to the third opening (35), and the top end of the conveying cylinder (30) is provided with a second opening (33).

5. A microfiltration pretreatment device for phosphorus-containing wastewater according to claim 4, characterized in that: A gravity scraper (28) is slidably mounted inside the filter frame (6), one end of the gravity scraper (28) is in contact with the outer wall of the second filter screen (25), and an inclined guide block (29) is fixedly mounted in the filter frame (6) at a position close to the third opening (35).

6. A microfiltration pretreatment device for phosphorus-containing wastewater according to claim 5, characterized in that: The side wall of the filter frame (6) is provided with a baffle plate (26); one end of the baffle plate (26) close to the second filter screen (25) is provided with a top rod corresponding to the mesh hole on the second filter screen (25); a sliding rod (27) is fixedly mounted on the side wall of the baffle plate (26); one end of the sliding rod (27) extends into the interior of the filter frame (6); and a return spring is provided between the sliding rod (27) and the filter frame (6).

7. The microfiltration pretreatment device for phosphorus-containing wastewater according to claim 1 is characterized in that: A first filter screen (14) is rotatably mounted inside the filter frame (6); the upper and lower ends of the first filter screen (14) are made of magnetic material; a counterweight (24) is fixedly mounted on the outer wall of the bottom end of the first filter screen (14); and an arc-shaped magnetic plate (13) for adsorbing the first filter screen (14) is fixedly mounted inside the sewage pool (1); the arc-shaped magnetic plate (13) is arranged directly below the transmission cylinder (5).

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