A multi-stage wastewater treatment device for leather recycling processing

Abstract

The application belongs to the technical field of wastewater treatment equipment, and particularly relates to a multi-stage wastewater treatment equipment for leather recycling and processing, which comprises a staged dissolved air flotation machine, the inner cavity of the staged dissolved air flotation machine is provided with a first-stage contact tank, a second-stage separation tank and a third-stage discharge tank, the inner wall top of the first-stage contact tank is fixedly connected with a fixing frame, the outer wall of the fixing frame is fixedly connected with a running motor one, the bottom outer wall shaft center of the running motor one is fixedly connected with an inner layer rotating rod, the outer wall of the end of the inner layer rotating rod away from the running motor one is fixedly connected with a connecting seat, the outer wall of the connecting seat is fixedly connected with multiple rotating plates, the rotating plates are arrayed and distributed, wastewater is input through the pressurized discharge of sewage to form liquid flow impact force, the liquid flow impact force drives the rotating plates to rotate around the connecting seat, and the arrayed and discharged micro air bubbles on the rotating plates can be uniformly distributed in the whole cavity of the first-stage contact tank.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wastewater treatment equipment, and particularly relates to a multi-stage wastewater treatment equipment for leather recycling and processing. BACKGROUND

[0002] Leather is an animal skin product processed in a special way, has many excellent properties and wide application, and the processing of real leather is very complex. The finished leather needs to go through dozens of processes, including hide processing (immersion, meat removal, degreasing, unhairing, alkali immersion, swelling, deliming, softening, acid immersion), tanning, splitting, shaving, retanning, neutralization, dyeing, oiling, filling, drying, finishing, and finishing. Therefore, the wastewater generated during leather processing contains high concentrations of organic matter, heavy metals, dyes and other harmful substances. The factory usually treats the leather processing wastewater through a grading treatment tank to remove harmful substances in the wastewater, so that the wastewater meets the standards for reuse or safe discharge.

[0003] For example, the electric float wastewater treatment equipment disclosed in CN214399888U has a structure including a tank body, a jet device, a scraper, a floatation tank, a dissolved air tank, and a dissolved air pump. The jet device is embedded at the bottom end of the tank body, the scraper is bolted to the left end of the floatation tank, the floatation tank is in interference fit with the jet device, the dissolved air tank is embedded and connected to the right side of the floatation tank, and the dissolved air pump is bolted to the right side of the tank body. The jet device includes a flow pipe, a base, an air jet pipe, a jet port, and a base. The flow pipe is riveted to the inside of the base, the base is flange-connected to the air jet pipe, the air jet pipe is in interference fit with the flow pipe, the jet port is embedded and connected to the air jet pipe, and the base is bolted to the upper end of the base. The electromagnetic valve of the jet device generates gas to make the water flow in the tank body flow upward from bottom to top, the gas flow is strengthened to make the micro bubbles rise upward, and the bubbles are prevented from staying in the wastewater to make the suspended matter difficult to be removed by the scraper.

[0004] However, the conventional device has the following problems when in use:

[0005] The existing air floatation tank air floatation device is affected by the characteristics of the liquid flow, the bubbles vertically float upward, the bubble density in the center of the tank is relatively high, and the bubble density on the inner wall of the tank is relatively low. When heavy and large particle impurities are discharged from the discharge hole, they will sink from the inner wall position of the tank, and it is difficult to completely replace the bubbles with a relatively low bubble density on the inner wall of the tank. The adhesion rate of the bubbles needs to be improved. SUMMARY

[0006] In view of the deficiencies in the prior art, the present application aims to provide a multi-stage wastewater treatment equipment for leather recycling and processing, which solves the problems of heavy and large particle impurities sinking from the inner wall position of the tank when discharged from the discharge hole, and the bubble density on the inner wall of the tank being relatively low and difficult to completely replace, and the adhesion rate of the bubbles needing to be improved.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a wastewater multistage treatment equipment for leather recycling and processing, comprising a staged dissolved air flotation machine, a first contact tank, a second separation tank and a third discharge tank are arranged in the inner cavity of the staged dissolved air flotation machine, a fixed frame is fixedly connected to the top of the inner wall of the first contact tank, a running motor one is fixedly connected to the outer wall of the fixed frame, an inner layer rotating rod is fixedly connected to the bottom outer wall shaft of the running motor one, a connecting seat is fixedly connected to the outer wall of the end of the inner layer rotating rod away from the running motor one, a plurality of rotating plates are fixedly connected to the outer wall of the connecting seat, the rotating plates are arrayed, and a main control box is fixedly connected to the outer wall.

[0008] Preferably, the outer wall of the staged dissolved air flotation machine is fixedly installed with a wastewater input pipe in communication with the inner wall of the first contact tank, and the discharge port of the wastewater input pipe is flush with the position height of the rotating plate in the first contact tank.

[0009] Preferably, the bottom outer wall of the running motor one is fixedly connected with an outer layer gas conveying rod, the bottom outer wall of the outer layer gas conveying rod is rotatably connected with the top outer wall of the connecting seat, the outer layer gas conveying rod is sleeved on the outer wall of the inner layer rotating rod, the outer wall of the staged dissolved air flotation machine is fixedly installed with a gas valve pipe in communication with the inner wall of the first contact tank, one end of the outer wall of the gas valve pipe is in communication with the inner wall of the outer layer gas conveying rod, the inner part of the rotating plate is provided with a communication port in communication with the inner wall of the outer layer gas conveying rod, the inner wall of the communication port is fixedly connected with a gas conveying main pipe, and the outer wall of the gas conveying main pipe is fixedly connected with a plurality of gas valve heads.

[0010] Preferably, the bottom outer wall of the rotating plate is fixedly connected with a rubber scraping strip, the bottom outer wall of the rubber scraping strip is movably attached to the bottom inner wall of the first contact tank, and the installation direction angle of the gas valve head is 45° downward horizontally.

[0011] Preferably, the outer wall of the rotating plate is provided with a communication groove in communication with both sides, the cross section of the communication groove is V-shaped, and the communication groove is located at the upper end of the gas conveying main pipe.

[0012] Preferably, the inner wall of the first contact tank is fixedly connected with a baffle, a plurality of connecting hinges are fixedly installed on the inner walls of both sides of the first contact tank, the connecting hinges are arrayed, the outer wall of the connecting hinge is fixedly connected with a hanging plate, and a plurality of through holes in communication with both sides are formed in the outer wall of the hanging plate.

[0013] Preferably, the outer wall of the one end of the hanging plate away from the connecting hinge is fixedly connected with a connecting magnetic strip, the outer wall of the top of the rotating plate is provided with a guide rail, the outer wall of one end of the top of the rotating plate is provided with a retainer, the outer wall of one side of the retainer is fixedly connected with a magnetic block, the magnetic block is magnetically connected with the connecting magnetic strip through the baffle, the outer wall of the bottom of the retainer is provided with a sliding groove, and the inner wall of the sliding groove is in sliding connection with the outer wall of the guide rail.

[0014] Preferably, the outer wall of one side of the magnetic block facing the rotating plate is fixedly connected with an extension rod, the outer wall of one side of the rotating plate facing the magnetic block is provided with a movable cavity, the outer wall of the extension rod is movably connected with the inner wall of the communication groove, the outer wall of one end of the extension rod away from the magnetic block is fixedly connected with a connecting spring, and the outer wall of one end of the connecting spring away from the extension rod is fixedly connected with the inner wall of one side of the movable cavity.

[0015] Preferably, the outer wall of the top of the multistage dissolved air flotation machine is fixedly provided with a plurality of fixed blocks, the inner wall of the fixed block is movably connected with a threaded link threaded sleeve, the outer wall of the top of the multistage dissolved air flotation machine is fixedly connected with a running motor two, the axis of the running motor two is fixedly connected with the outer wall of one side of the threaded link threaded sleeve, the outer wall of the threaded link threaded sleeve is in meshed connection with, the outer wall of the bottom is fixedly connected with a limiting rod, the outer wall of the limiting rod is fixedly provided with a rubber wiping strip, and the outer wall of the rubber wiping strip is movably attached to the outer wall of the plurality of hanging plates.

[0016] Preferably, the outer wall of the top of the multistage dissolved air flotation machine is fixedly provided with a mounting bracket, the inner wall of the mounting bracket is fixedly provided with a rotary chain, the rotary chain is fixedly connected with a scraper, and the inner wall of the three-stage discharge tank is fixedly connected with a discharge valve pipe.

[0017] In order to make the purpose, technical scheme of the present application clear, complete description and the advantages more clearly, the embodiments of the present application are further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present application, rather than all the embodiments, and are used to explain the embodiments of the present application, and are not used to limit the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] In the present application, the wastewater input pipe is used to form liquid flow impact force through the pressurized discharge of sewage, the liquid flow impact force is used to push the rotating plate, so that the multiple rotating plates rotate around the connecting seat as the axis, the micro-bubbles arrayed on the rotating plate can be uniformly distributed in the entire cavity of the primary contact pool, and the bubbles are impacted by the liquid flow of the wastewater input pipe when being discharged, so that the impurities in the wastewater in the primary contact pool are fully mixed, thereby improving the adsorption efficiency of the bubbles. At the same time, the multiple rotating plates rotate around the connecting seat as the axis, so as to form a vortex flow, which reduces the speed of the micro-bubbles floating to the water surface, so that the impurities in the wastewater can be fully adsorbed, thereby further improving the adsorption efficiency of the bubbles. Further, the rotation of the rotating plate drives the rubber scraping strip to scrape the impurities deposited on the bottom of the primary contact pool to avoid deposition, and the gas delivery valve head inclined downward horizontally by 45° impacts the bubbles on the bottom inner wall of the primary contact pool, so that the bubbles and the impurities in the wastewater are fully mixed by the rotation of the rotating plate, thereby fully replacing the impurities in the wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0021] Figure 2 It is a schematic diagram of the front view structure of the present application.

[0022] Figure 3 It is a schematic diagram of the top view structure of the present application.

[0023] Figure 4 It is a schematic diagram of the overall structure of the primary contact pool of the present application.

[0024] Figure 5 It is a schematic diagram of the internal structure of the primary contact pool of the present application.

[0025] Figure 6 It is a schematic diagram of the internal structure of the primary contact pool of the present application. Figure 5 It is a schematic diagram of the structure of A in the present application.

[0026] Figure 7 It is a schematic diagram of the structure of B in the present application. Figure 5 It is a schematic diagram of the structure of B in the present application.

[0027] Figure 8 It is a schematic diagram of the overall structure of the rotating plate of the present application.

[0028] Figure 9 It is a schematic diagram of the internal structure of the outer gas delivery rod of the present application.

[0029] Figure 10 It is a schematic diagram of the overall structure of the rotating plate of the present application.

[0030] Figure 11 It is a schematic diagram of the internal structure of the movable cavity of the present application.

[0031] Figure 12 The structure diagram of the extended rotating plate of the present application.

[0032] Figure 13 The structure diagram of the communication groove of the present application.

[0033] In the figure: 1, the hierarchical dissolved air flotation machine; 2, the first contact tank; 3, the second separation tank; 4, the third discharge tank; 5, the air valve pipe; 6, the discharge valve pipe; 7, the fixed frame; 8, the running motor one; 9, the inner rotating rod; 10, the connecting seat; 11, the rotating plate; 12, the waste water input pipe; 13, the baffle; 14, the outer gas conveying rod; 15, the communication port; 16, the gas conveying main pipe; 17, the gas conveying valve head; 18, the rubber scraping strip; 19, the retainer; 20, the sliding groove; 21, the guide rail; 22, the magnetic block; 23, the extension rod; 24, the connecting spring; 25, the movable cavity; 26, the communication groove; 27, the connecting hinge; 28, the hanging plate; 29, the through port; 30, the connecting magnetic strip; 31, the fixed block; 32, the running motor two; 33, the threaded connecting rod; 34, the threaded sleeve; 35, the limiting rod; 36, the rubber wiping strip; 37, the mounting frame; 38, the rotary chain; 39, the scraper; 40, the main control case. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme of the present application clear, complete description, and the advantages are more clear and obvious, the following combining with the figure of the present application embodiment carries out further detailed explanation. It should be understood that the specific embodiments described here are part of the embodiments of the present application, not all the embodiments, only to explain the embodiments of the present application, and not for the purpose of limiting the embodiments of the present application, all other embodiments obtained by the person skilled in the art without doing creative work, belong to the scope of the present application.

[0035] Example one, please refer to Figures 1 to 13The application provides a technical scheme: a wastewater multistage treatment equipment for leather recycling and processing, which comprises a staged dissolved air flotation machine 1, a first-stage contact tank 2, a second-stage separation tank 3 and a third-stage discharge tank 4 are arranged in the inner cavity of the staged dissolved air flotation machine 1, a fixed frame 7 is fixedly connected to the inner wall top of the first-stage contact tank 2, a running motor one 8 is fixedly connected to the outer wall of the fixed frame 7, an inner layer rotating rod 9 is fixedly connected to the bottom outer wall shaft center of the running motor one 8, a connecting seat 10 is fixedly connected to the outer wall of the end of the inner layer rotating rod 9 away from the running motor one 8, a plurality of rotating plates 11 are fixedly connected to the outer wall of the connecting seat 10, the rotating plates 11 are arrayed, a main control machine box 40 is fixedly connected to the outer wall of the 1, a wastewater input pipe 12 which is communicated with the inner wall of the first-stage contact tank 2 is fixedly installed on the outer wall of the staged dissolved air flotation machine 1, the discharge port of the wastewater input pipe 12 is flush with the position height of the rotating plate 11 in the first-stage contact tank 2, an outer layer gas conveying rod 14 is fixedly connected to the bottom outer wall of the running motor one 8, the bottom outer wall of the outer layer gas conveying rod 14 is rotatably connected to the top outer wall of the connecting seat 10, the outer layer gas conveying rod 14 is sleeved on the outer wall of the inner layer rotating rod 9, a gas valve pipe 5 which is communicated with the inner wall of the first-stage contact tank 2 is fixedly installed on the outer wall of the staged dissolved air flotation machine 1, one end of the outer wall of the gas valve pipe 5 is communicated with the inner wall of the outer layer gas conveying rod 14, a communication port 15 which is communicated with the inner wall of the outer layer gas conveying rod 14 is arranged in the rotating plate 11, a gas conveying main pipe 16 is fixedly connected to the inner wall of the communication port 15, a plurality of gas valve heads 17 are fixedly communicated on the outer wall of the gas conveying main pipe 16, a rubber scraping strip 18 is fixedly connected to the bottom outer wall of the rotating plate 11, the bottom outer wall of the rubber scraping strip 18 is movably attached to the bottom inner wall of the first-stage contact tank 2, and the installation direction angle of the gas valve head 17 is 45 degrees horizontally downward.

[0036] In the application, the wastewater input pipe 12 is used to form liquid flow impact force through the pressurized discharge of sewage, the liquid flow impact force drives the rotating plate 11, so that the plurality of rotating plates 11 rotate around the connecting seat 10, the micro-bubbles arrayed on the rotating plate 11 can be uniformly distributed in the whole cavity of the first-stage contact tank 2, and the bubbles are impacted by the liquid flow of the wastewater input pipe 12 when being discharged, so that the wastewater impurities in the first-stage contact tank 2 are fully mixed, thereby improving the adsorption efficiency of the bubbles, at the same time, the plurality of rotating plates 11 rotate around the connecting seat 10 to form a vortex flow, the speed of the micro-bubbles floating to the water surface is reduced, the micro-bubbles can be fully adsorbed with the impurities in the wastewater, thereby further improving the adsorption efficiency of the bubbles, and further using the rotation of the rotating plate 11 to drive the rubber scraping strip 18 to scrape the impurities deposited on the bottom of the first-stage contact tank 2 to avoid deposition, and the gas valve head 17 which is 45 degrees horizontally downward impacts the bubbles on the bottom inner wall of the first-stage contact tank 2, the rotation of the rotating plate 11 makes the three fully mix the bubbles and the wastewater impurities, and fully replace the impurities in the wastewater.

[0037] In the embodiment two, the outer wall of the rotating plate 11 is provided with a communication groove 26 which is connected at two sides and has a V-shaped cross section, and the communication groove 26 is located at the upper end of the gas conveying main pipe 16.

[0038] In the application, the wastewater at the bottom of the primary contact tank 2 is extruded through the V-shaped communication groove 26 when the rotating plate 11 rotates, the impurities are broken by the extrusion of the water flow, the attachment efficiency of the bubbles is improved, and the replacement efficiency of the wastewater is improved.

[0039] In the embodiment three, the inner wall of the primary contact tank 2 is fixedly connected with a baffle 13, the two side inner walls of the primary contact tank 2 are fixedly installed with a plurality of connecting hinges 27 which are arranged in an array, the outer wall of the connecting hinge 27 is fixedly connected with a hanging plate 28, the outer wall of the hanging plate 28 is provided with a plurality of through openings 29 which are connected at two sides, the outer wall of the end of the hanging plate 28 away from the connecting hinge 27 is fixedly connected with a connecting magnetic strip 30, the top outer wall of the rotating plate 11 is provided with a guide rail 21, one end of the top outer wall of the rotating plate 11 is provided with a retainer 19, the outer wall of one side of the retainer 19 is fixedly connected with a magnetic block 22, the magnetic block 22 is magnetically connected with the connecting magnetic strip 30 through the baffle 13, the bottom outer wall of the retainer 19 is provided with a sliding groove 20, the inner wall of the sliding groove 20 is slidably connected with the outer wall of the guide rail 21, the outer wall of one side of the magnetic block 22 facing the rotating plate 11 is fixedly connected with an extension rod 23, the outer wall of the rotating plate 11 facing the magnetic block 22 is provided with a movable cavity 25, the outer wall of the extension rod 23 is movably connected with the inner wall of the communication groove 26, the outer wall of the end of the extension rod 23 away from the magnetic block 22 is fixedly connected with a connecting spring 24, and the outer wall of the end of the connecting spring 24 away from the extension rod 23 is fixedly connected with the inner wall of one side of the movable cavity 25.

[0040] In the application, the contact surface in the primary contact tank 2 is increased by the plurality of hanging plates 28, the wall-hanging rate of the impurities and the bubbles is improved, when the rotating plate 11 rotates, the magnetic block 22 is resisted by the tension of the connecting spring 24 and is attached to the outer wall of the baffle 13, the magnetic block 22 and the connecting magnetic strip 30 are magnetically adsorbed, the hanging plate 28 is synchronously and slightly shaken by the rapid sliding of the magnetic block 22 on the outer wall of the baffle 13, the impurities with enough bubbles on the outer wall of the hanging plate 28 are shaken and floated to the water surface, the speed of the micro bubbles floating to the water surface is reduced by the device, the impurities in the primary contact tank 2 can be fully wall-hung, and the replacement efficiency is improved, at the same time, the water flow is extruded when the hanging plate 28 swings through the plurality of through openings 29 on the hanging plate 28, the impurities are further broken, and the replacement efficiency is improved.

[0041] The embodiment four, on the basis of the embodiment three, a plurality of fixed blocks 31 are fixedly installed on the top outer wall of the staged dissolved air flotation machine 1, the inner wall of the fixed block 31 is movably connected with a threaded link threaded sleeve 34, a running motor two 32 is fixedly connected with the top outer wall of the staged dissolved air flotation machine 1, the axis of the running motor two 32 is fixedly connected with the outer wall of one side of the threaded link threaded sleeve 34, the outer wall of the threaded link threaded sleeve 34 is meshedly connected with 34, the bottom outer wall of 34 is fixedly connected with a limiting rod 35, the outer wall of the limiting rod 35 is fixedly sleeved with a rubber wiping strip 36, the outer wall of the rubber wiping strip 36 is movably attached with the outer wall of the plurality of hanging plates 28, a mounting frame 37 is fixedly installed on the top outer wall of the staged dissolved air flotation machine 1, a rotary chain 38 is fixedly installed on the inner wall of the mounting frame 37, a scraper 39 is fixedly connected with the rotary chain 38, and the inner wall of the three-stage discharge tank 4 is fixedly communicated with the discharge valve pipe 6.

[0042] In the application, the threaded link threaded sleeve 34 is driven to rotate by the running motor one 32, the rubber wiping strip 36 is driven to move transversely by the meshed connection of 34, and the two side outer walls of the hanging plate 28 are scraped by the back-and-forth movement of the rubber wiping strip 36, so that the hanging plate 28 is regularly cleaned, the possible large impurities are prevented from being stuck on the wall, the impurities are replaced and floated by the floating bubbles of the vortex flow when falling, even if the impurities cannot float and fall to the bottom of the first-stage contact tank 2, the impurities are also double-broken by the scraping and breaking of the rubber scraping strip 18 and the extrusion of the communication groove 26, and the impact is small impurities to achieve the floating condition.

[0043] The working principle and use process of the present application: in the present application, the wastewater input pipe 12 is used to form liquid flow impact force through the pressurized discharge of sewage, which drives the rotating plate 11 to rotate around the connecting seat 10, so that the micro-bubbles arrayed on the rotating plate 11 can be uniformly distributed in the entire cavity of the primary contact tank 2, and the bubbles are impacted by the liquid flow of the wastewater input pipe 12 when discharged, thereby fully mixing with the impurities in the wastewater in the primary contact tank 2, thereby improving the adsorption efficiency of the bubbles. At the same time, the plurality of rotating plates 11 rotate around the connecting seat 10 to form a vortex flow, which reduces the speed of the micro-bubbles floating to the water surface, and can fully adsorb the impurities in the wastewater, thereby further improving the adsorption efficiency of the bubbles. Further, the rotation of the rotating plate 11 drives the rubber scraping strip 18 to scrape the impurities deposited at the bottom of the primary contact tank 2 to avoid deposition, and the gas delivery valve head 17 inclined downward horizontally by 45° will impact the bubbles on the inner wall of the bottom of the primary contact tank 2. The rotation of the rotating plate 11 makes the three cooperate with each other to fully mix the bubbles with the impurities in the wastewater, and fully replace the impurities in the wastewater. In the present application, the wastewater at the bottom of the primary contact tank 2 is extruded through the V-shaped communication groove 26 when the rotating plate 11 rotates, which breaks the impurities by the extrusion of the water flow, thereby improving the adhesion efficiency of the bubbles and the replacement efficiency of the wastewater. In the present application, the contact surface in the primary contact tank 2 is increased by the plurality of hanging plates 28, thereby improving the wall-hanging rate of the impurities and the bubbles. When the rotating plate 11 rotates, the magnetic block 22 is resisted by the tension of the connecting spring 24 and adheres to the outer wall of the baffle 13, so that the magnetic block 22 and the connecting magnetic strip 30 are magnetically adsorbed, and the hanging plate 28 is synchronously shaken with a small amplitude by the rapid sliding of the magnetic block 22 on the outer wall of the baffle 13. The impurities adhered to the outer wall of the hanging plate 28 are shaken and floated to the water surface by the shaking, which reduces the speed of the micro-bubbles floating to the water surface, and can be fully wall-hung to the impurities in the primary contact tank 2, thereby improving the replacement efficiency. At the same time, the water flow is extruded when the hanging plate 28 swings through the plurality of through holes 29 on the hanging plate 28, thereby further breaking the impurities and improving the replacement efficiency. In the present application, the threaded connecting rod threaded sleeve 34 is driven to rotate by starting the running motor one 32, which drives the rubber wiping strip 36 to move transversely through the engagement connection of 34, thereby periodically cleaning the hanging plate 28 by wiping the outer walls on both sides of the hanging plate 28, thereby avoiding that the larger impurities may be wall-hung and stuck. When the impurities fall, they are replaced and floated with the floating bubbles of the vortex flow. Even if they cannot float to the bottom of the primary contact tank 2, they will also be double-broken by the scraping and breaking of the rubber scraping strip 18 and the extrusion of the communication groove 26, and the impact will be small impurities to achieve the floating condition.

[0044] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A multi-stage wastewater treatment device for leather recycling processing, comprising a staged dissolved air flotation machine (1), characterized in that: The inner cavity of the staged dissolved air flotation machine (1) is provided with a first contact tank (2), a second separation tank (3) and a third discharge tank (4), the inner wall top of the first contact tank (2) is fixedly connected with a fixed frame (7), the outer wall of the fixed frame (7) is fixedly connected with a running motor I (8), the bottom outer wall shaft center of the running motor I (8) is fixedly connected with an inner layer rotating rod (9), the outer wall of the one end of the inner layer rotating rod (9) away from the running motor I (8) is fixedly connected with a connecting seat (10), the outer wall of the connecting seat (10) is fixedly connected with a plurality of rotating plates (11), the rotating plates (11) are arrayed, the outer wall of the (1) is fixedly connected with a main control case (40), the bottom outer wall of the running motor I (8) is fixedly connected with an outer layer gas conveying rod (14), the bottom outer wall of the outer layer gas conveying rod (14) is rotatably connected with the top outer wall of the connecting seat (10), the outer layer gas conveying rod (14) is sleeved on the outer wall of the inner layer rotating rod (9), the outer wall of the staged dissolved air flotation machine (1) is fixedly installed with a gas valve pipe (5) which is communicated with the inner wall of the first contact tank (2), one end of the outer wall of the gas valve pipe (5) is communicated with the inner wall of the outer layer gas conveying rod (14), the inner part of the rotating plate (11) is provided with a communication port (15) which is communicated with the inner wall of the outer layer gas conveying rod (14), the inner wall of the communication port (15) is fixedly connected with a gas conveying main pipe (16), the outer wall of the gas conveying main pipe (16) is fixedly communicated with a plurality of gas valve heads (17), the outer wall of the staged dissolved air flotation machine (1) is fixedly installed with a waste water input pipe (12) which is communicated with the inner wall of the first contact tank (2), the discharge port of the waste water input pipe (12) is flush with the position height of the rotating plate (11) in the first contact tank (2), the bottom outer wall of the rotating plate (11) is fixedly connected with a rubber scraping strip (18), the bottom outer wall of the rubber scraping strip (18) is movably attached to the bottom inner wall of the first contact tank (2), the installation direction angle of the gas valve head (17) is 45° horizontally downward, the inner wall of the first contact tank (2) is fixedly connected with a baffle (13), a plurality of connecting hinges (27) are fixedly installed on the inner wall of the two sides of the first contact tank (2), the connecting hinges (27) are arrayed, the outer wall of the connecting hinge (27) is fixedly connected with a hanging plate (28), the outer wall of the hanging plate (28) is provided with a plurality of through ports (29) which are communicated on the two sides, the outer wall of the one end of the hanging plate (28) away from the connecting hinge (27) is fixedly connected with a connecting magnetic strip (30), the top outer wall of the rotating plate (11) is provided with a guide rail (21), one end of the top outer wall of the rotating plate (11) is provided with a retainer (19), the outer wall of one side of the retainer (19) is fixedly connected with a magnetic block (22), the magnetic block (22) is magnetically connected with the connecting magnetic strip (30) through the baffle (13), the bottom outer wall of the retainer (19) is provided with a sliding groove (20), the inner wall of the sliding groove (20) is slidably connected with the outer wall of the guide rail (21),The side outer wall of the magnetic block (22) facing the rotating plate (11) is fixedly connected with an extension rod (23), the side outer wall of the rotating plate (11) facing the magnetic block (22) is provided with a movable cavity (25), the outer wall of the extension rod (23) is movably connected with the inner wall of the communication groove (26), the outer wall of the end of the extension rod (23) away from the magnetic block (22) is fixedly connected with a connecting spring (24), and the outer wall of the end of the connecting spring (24) away from the extension rod (23) is fixedly connected with the inner wall of one side of the movable cavity (25).

2. The multi-stage wastewater treatment apparatus for leather recycling processing according to claim 1, characterized in that: The outer wall of the rotating plate (11) is provided with a communication groove (26) with two sides connected in communication, the cross section of the communication groove (26) is V-shaped, and the communication groove (26) is located at the upper end of the gas conveying main pipe (16).

3. The multi-stage wastewater treatment apparatus for leather recycling processing according to claim 1, characterized in that: The top outer wall of the grading dissolved air flotation machine (1) is fixedly provided with a mounting rack (37), the inner wall of the mounting rack (37) is fixedly provided with a rotary chain (38), the rotary chain (38) is fixedly connected with a scraper (39), and the inner wall of the three-stage discharge tank (4) is fixedly connected with a discharge valve pipe (6).

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