Wastewater treatment equipment and method for indigo production

Abstract

The present invention belongs to the technical field of sewage treatment, and specifically is a sewage treatment device and a treatment method for indigo production of the present invention, comprising a sewage treatment box, a sewage outlet is provided at the bottom of the sewage treatment box, a rotating shaft is rotatably connected to the middle of the bottom of the sewage treatment box, a driving motor is fixedly arranged on the top of the rotating shaft, a rotating rod is fixedly connected to the surface of the rotating shaft, a cleaning plate 1 is fixedly connected to the bottom of the rotating rod, a cleaning component is arranged inside the sewage treatment box, and the cleaning component comprises a guide block; the present invention drives a slider to move up and down under the action of a guide groove and a guide column through the rotation of the rotating shaft, when the slider is reset, the guide rod 1 contacts the U-shaped block, and under the action of the U-shaped connecting block, two cleaning plates 2 are driven to clean all the cleaning plates 1, and then the flocculants hanging on the surface are scraped off, thereby preventing the problem of the cleaning plate 1 rotating slowly during operation, and improving its cleaning efficiency and sedimentation effect.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a sewage treatment device and a treatment method for indigo production. Background Art

[0002] With the increasingly stringent environmental protection laws and regulations and the enhancement of public environmental awareness, the requirements for sewage treatment effluent quality are also constantly increasing.

[0003] The existing sewage treatment equipment for indigo production will generate a large amount of sewage during the indigo production process. After a series of water treatment processes such as pretreatment, air flotation filtration, membrane filtration, MVR evaporator concentration, desalination and adsorption, magnetic powder is added to the sewage. By introducing the magnetic powder and the magnetic field, the magnetic powder is effectively combined with the pollutants in the sewage to form high-density floccules. After these floccules enter the sedimentation tank, they quickly settle under the action of gravity and the magnetic field. The floccules that sink to the bottom of the water are scraped into the central mud outlet at the bottom of the sedimentation tank by the scraper. The precipitated floccules and water are discharged by a water pump, and the floccules and water are separated by filtration. At this time, the water meets the national emission standards and can be discharged.

[0004] There are still some problems in the actual application of the above scheme. When using the scraper in the sewage treatment equipment for indigo production, the flocculent at the bottom of the sedimentation tank is in a flocculent state. In the process of the scraper of the scraper scraping the flocculent into the central mud mouth of the sedimentation tank, part of the flocculent hangs on the scraper. As the scraper continues to run, the flocculent on the scraper accumulates continuously, resulting in an increase in the mass of the scraper, which slows down the rotation speed of the scraper during operation, reducing the scraper's efficiency in scraping the flocculent precipitated at the bottom of the sedimentation tank. At the same time, the flocculent hanging on the scraper will block the gap between the scrapers, resulting in an increase in the contact area between the scrapers and the water flow during operation, further accelerating the flow of water in the sedimentation tank, causing the flocculent at the bottom of the sedimentation tank to be disturbed by the flow of water, thereby causing the flocculent to move with the water flow and dispersing the pollutants in the flocculent into the water in the sedimentation tank, reducing the sedimentation effect.

[0005] To this end, the present invention provides a wastewater treatment device and a treatment method for indigo production. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: the sewage treatment equipment for indigo production described in the present invention comprises a sewage treatment box, a sewage outlet is provided at the bottom of the sewage treatment box, a rotating shaft is rotatably connected to the middle of the bottom of the sewage treatment box, a driving motor is fixedly arranged on the top of the rotating shaft, a rotating rod is fixedly connected to the surface of the rotating shaft, and a cleaning plate is fixedly connected to the bottom of the rotating rod, characterized in that:

[0008] A cleaning assembly is provided inside the sewage treatment tank, and the cleaning assembly includes a guide block, the guide block is fixedly connected between the inner walls of the sewage treatment tank, a guide rod 1 is fixedly provided at the bottom end of the guide block, a downward pressing device is provided on the rotating rod, the downward pressing device includes a U-shaped block, the U-shaped block slides inside the rotating rod, the bottom end of the guide rod 1 abuts against the top of the U-shaped block, a reciprocating spring 2 is fixedly connected between the lower surface of the top of the U-shaped block and the top of the rotating rod, a cleaning plate 2 is fixedly connected to the bottom end of the U-shaped block, and the downward movement of the guide rod 1 abuts the operation of the downward pressing device, so that the cleaning plate 2 cleans the flocs remaining on the cleaning plate 1.

[0009] Preferably, the rotating shaft passes through the top of the sewage treatment tank, the top of the rotating shaft is fixedly connected to the output end of the driving motor, the rotating rod is close to the bottom end of the rotating shaft, and a plurality of cleaning plates are provided, and the plurality of cleaning plates are symmetrically arranged with the rotating shaft as the center.

[0010] Preferably, the guide block is in a cross shape, and is composed of a vertical slide block and two transverse fixing rods, and the ends of the two transverse fixing rods away from the vertical slide block are respectively fixed on the inner walls on both sides of the sewage treatment tank.

[0011] Preferably, the U-shaped block is in the shape of a U with its port facing toward cleaning plate one, and the shape of cleaning plate two is in the shape of a U with its port facing toward one end of the rotating rod, the inner walls at both ends of the U-shape are in contact with the two side surfaces of cleaning plate one, and the pressing device is symmetrically arranged with the rotating shaft as the center, and U-shaped connecting blocks are fixedly connected on both sides of the two cleaning plates two, and the shape of the U-shaped connecting block is in the shape of a U with its port facing toward cleaning plate two.

[0012] Preferably, the cleaning assembly also includes a slider, which slides in a vertical slide block of the guide block, the top of the slider is fixedly connected to a guide rod 2, a return spring 1 is fixedly connected between the bottom end of the slider and the bottom of the vertical slide block of the guide block, the bottom end of the slider is fixed to the top of a guide rod, the return spring is set on the outside of a surface of a guide rod, one end of the slider is fixedly connected to an extension block, the end of the extension block away from the slider is fixedly connected to a guide column, the surface of the rotating shaft is provided with a guide groove, and the guide column slides in the guide groove.

[0013] Preferably, the guide groove consists of a spiral groove and a straight groove, the top of the spiral groove is connected to the top of the straight groove, the bottom of the spiral groove is connected to the bottom of the straight groove, and the depth of the spiral groove is different, and its depth gradually decreases from the bottom to the top.

[0014] Preferably, a feeding assembly is provided on the top of the sewage treatment tank, and the feeding assembly is composed of a storage device and a trigger device, the storage device includes a storage slot, the storage slot is opened on the top of the sewage treatment tank, a blocking plate is slidably connected in the storage slot, a limiting slot is opened on the top of the sewage treatment tank, a limiting rod is slidably connected in the limiting slot, the bottom end of the limiting rod is fixedly connected to the top of the blocking plate, the top of the limiting rod is fixedly connected to a circular plate, a compression spring is fixedly connected between the circular plate and the top of the sewage treatment tank, and the compression spring is sleeved outside the limiting rod.

[0015] Preferably, the storage groove is composed of a circular groove one and a circular groove two of different diameters, the circular groove two is connected to the limiting groove, the blocking plate is composed of a conical piece and a circular ring block, the conical piece matches the shape of the circular groove one, the diameter difference between the circular groove one and the circular groove two is the diameter of the circular ring block, and there are multiple limiting grooves.

[0016] Preferably, the trigger device includes a displacement groove 1, which is opened on the top of the sewage treatment tank, and an L-shaped displacement rack rod is slidably connected in the displacement groove 1, and one side of the L-shaped displacement rack rod is fixed to the inner ring surface of the circular ring plate. A displacement groove 2 is opened on the top of the sewage treatment tank, and a linear rack rod is slidably connected in the displacement groove 2. The displacement groove 1 is connected to the middle part of the displacement groove 2, and a guide gear is rotatably connected between the connection point between the displacement groove 1 and the displacement groove 2, and the guide gear is respectively meshed with the L-shaped displacement rack rod and the linear rack rod, and the bottom end of the linear rack rod is fixed to the top of the guide rod 2.

[0017] A method for treating wastewater from indigo production, comprising the following specific steps:

[0018] Step 1: pretreatment, preparation of aniline acetic acid and potassium hydroxide required for the production of indigo;

[0019] Step 2: Preparation, separation and purification: After condensing anilinoacetic acid and potassium hydroxide, sodium hydroxide is added to carry out an alkali fusion reaction, and then air or oxygen is introduced to generate an indigo solid. The final indigo product is obtained by filtering, washing and drying, and the wastewater generated in the indigo production process is sent to a wastewater treatment device;

[0020] Step 3: Wastewater treatment, after a series of water treatment processes such as pretreatment, air flotation filtration, membrane filtration, MVR evaporator concentration, desalination and adsorption, magnetic powder is added to the sewage to make the pollutants in the sewage form flocs, and the stirring of the cleaning plate 1 accelerates the precipitation of the flocs, and the precipitated flocs and water are discharged through the sewage outlet, and filtered to separate the flocs and water. At this time, the filtered water meets the national emission standards and can be discharged.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention drives the slider to move up and down through the rotation of the rotating shaft under the action of the guide groove and the guide column. When the slider is reset, the guide rod 1 contacts the U-shaped block, and under the action of the U-shaped connecting block, the two cleaning plates 2 are driven to clean all the cleaning plates 1, and then the flocculants hanging on the surface are scraped off, thereby preventing the problem of the cleaning plate 1 rotating slowly during operation, and improving its cleaning efficiency and sedimentation effect.

[0023] 2. When the slider moves upward, the guide gear is pushed upward to generate a gap between the baffle plate and the storage tank, so that the magnetic powder inside can slide out through the conical piece of the baffle plate, and the magnetic powder can be evenly scattered in the sewage treatment tank, so that the magnetic powder can contact the pollutants in the sewage, thereby forming floccules, which further speeds up the treatment of the sewage.

[0024] 3. The present invention achieves the effect of cleaning the surface of the cleaning plate and adding magnetic powder into the sewage treatment tank through the movement of the slider, thereby improving the efficiency of the precipitation and collection of flocculants and accelerating the sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic elevation diagram of the overall device of the present invention;

[0027] Figure 2 It is a cross-sectional schematic diagram of the overall device of the present invention;

[0028] Figure 3 This is a schematic diagram of the position relationship between the guide block and the slider of the present invention;

[0029] Figure 4 This is a schematic diagram of the positional relationship between the guide groove and the guide column of the present invention;

[0030] Figure 5 It is a schematic diagram of the position relationship between the rotating rod and the extension block of the present invention;

[0031] Figure 6 This is a schematic diagram of the positional relationship between the sewage treatment tank and the storage tank of the present invention;

[0032] Figure 7 For the present invention Figure 6 Enlarged schematic diagram at point A in the middle.

[0033] Reference numerals: 1, sewage treatment tank; 11, sewage outlet; 12, rotating shaft; 13, driving motor; 14, rotating rod; 15, cleaning plate 1;

[0034] 21. Guide block; 22. Slider; 23. Return spring 1; 24. Guide rod 1; 25. Guide rod 2; 26. Guide groove; 27. Extension block; 28. Guide column; 29. ​​U-shaped block; 210. Reciprocating spring 2; 211. Cleaning plate 2; 212. U-shaped connecting block;

[0035] 31. Storage slot; 32. Blocking plate; 33. Limiting slot; 34. Limiting rod; 35. Circular plate; 36. Compression spring; 37. Displacement slot 1; 38. L-shaped displacement rack rod; 39. Displacement slot 2; 310. Linear rack rod; 311. Guide gear. DETAILED DESCRIPTION

[0036] 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. Example 1

[0037] like Figures 1 to 7 As shown, a sewage treatment device for indigo production according to an embodiment of the present invention comprises a sewage treatment tank 1, a sewage outlet 11 is provided at the bottom of the sewage treatment tank 1, a rotating shaft 12 is rotatably connected to the middle of the bottom of the sewage treatment tank 1, a driving motor 13 is fixedly arranged on the top of the rotating shaft 12, a rotating rod 14 is fixedly connected to the surface of the rotating shaft 12, and a cleaning plate 15 is fixedly connected to the bottom of the rotating rod 14, characterized in that:

[0038] A cleaning assembly is arranged inside the sewage treatment tank 1, and the cleaning assembly includes a guide block 21, which is fixedly connected between the inner walls of the sewage treatment tank 1, a guide rod 24 is fixedly arranged at the bottom end of the guide block 21, and a pressing device is arranged on the rotating rod 14, and the pressing device includes a U-shaped block 29, which slides inside the rotating rod 14, and the bottom end of the guide rod 24 abuts against the top end of the U-shaped block 29, and a reciprocating spring 210 is fixedly connected between the lower surface of the top of the U-shaped block 29 and the top of the rotating rod 14, and a cleaning plate 211 is fixedly connected to the bottom end of the U-shaped block 29, and the downward movement of the guide rod 24 resists the operation of the pressing device, so that the cleaning plate 211 cleans the flocs remaining on the cleaning plate 15.

[0039] Specifically, there are still some problems in the actual application of the above scheme. When the cleaning plate 15 is used, the flocculent at the bottom of the sewage treatment tank 1 is in a flocculent state. In the process of the cleaning plate 15 scraping the flocculent into the sewage outlet 11, part of the flocculent hangs on the cleaning plate 15. As the cleaning plate 15 continues to operate, the flocculent on the cleaning plate 15 continues to accumulate, resulting in an increase in the mass of the cleaning plate 15, which slows down the rotation speed of the cleaning plate 15 during operation, reducing the efficiency of the cleaning plate 15 in scraping the flocculent deposited at the bottom of the sewage treatment tank 1. At the same time, the flocculent hanging on the cleaning plate 15 will block the gap of the cleaning plate 15, resulting in an increase in the contact area between the cleaning plate 15 and the water flow during operation, further accelerating the flow of water in the sewage treatment tank 1, causing the flocculent at the bottom of the sewage treatment tank 1 to be disturbed by the flow of water, thereby causing the flocculent to move with the water flow and dispersing the pollutants in the flocculent into the water in the sewage treatment tank 1, reducing the precipitation effect.

[0040] Therefore, the present invention solves this problem by setting a corresponding structure, and the sewage after a series of water treatment processes is discharged into the sewage treatment tank 1 through the water inlet set on the sewage treatment tank 1, and magnetic powder is sprinkled into the sewage. At this time, the driving motor 13 is started to rotate, and the rotating shaft 12 is driven to rotate by the driving motor 13, so that the cleaning plate 15 starts to rotate, and the precipitation of flocs formed by the magnetic powder and pollutants in the sewage is accelerated. The bottom of the sewage treatment tank 1 is set to be a depression with a low center and high surroundings. Through the rotation of the cleaning plate 15, the flocs settled at the bottom of the sewage treatment tank 1 are scraped to the sewage outlet 11. A water pump is set in the sewage outlet 11. By driving the water pump at a fixed time, the flocs and water settled in the sewage outlet 11 are discharged. During the rotation of the cleaning plate 15, the cleaning plate 2 211 thereon cleans the flocs hanging on the cleaning plate 15 through the operation of the cleaning component.

[0041] like Figure 2 and Figure 6 As shown, in this embodiment, the rotating shaft 12 passes through the top of the sewage treatment tank 1, the top of the rotating shaft 12 is fixedly connected to the output end of the driving motor 13, the rotating rod 14 is close to the bottom end of the rotating shaft 12, and a plurality of cleaning plates 15 are provided, and the plurality of cleaning plates 15 are symmetrically arranged with the rotating shaft 12 as the center.

[0042] Specifically, by starting the driving motor 13, the rotating shaft 12 is driven to rotate, so that the symmetrically arranged multiple cleaning plates 15 rotate. When they rotate, the water flow will produce relatively weak movement with their rotation, thereby accelerating the precipitation of flocculants in the sewage.

[0043] like Figure 2 and Figure 3As shown, the guide block 21 of this embodiment is in the shape of a cross, and the guide block 21 is composed of a vertical slide block and two transverse fixing rods, and the ends of the two transverse fixing rods away from the vertical slide block are respectively fixed on the inner walls of the sewage treatment tank 1 on both sides.

[0044] Specifically, the vertical slide block is limited by the fixation of the transverse fixing rod so as to remain fixed.

[0045] like Figure 2 and Figure 5 As shown, the shape of the U-shaped block 29 of this embodiment is a U-shape with its port facing the cleaning plate 15, and the shape of the cleaning plate 211 is a U-shape with its port facing one end of the rotating rod 14. The inner walls at both ends of the U-shape are in contact with the surfaces on both sides of the cleaning plate 15. The pressing device is symmetrically arranged with the rotating shaft 12 as the center. Both sides of the two cleaning plates 211 are fixedly connected with U-shaped connecting blocks 212. The shape of the U-shaped connecting blocks 212 is a U-shape with its port facing the cleaning plate 211.

[0046] Specifically, the shape of the U-shaped block 29 is such that when it is displaced, the two sides of its U-shape slide in the rotating rod 14, playing a guiding and limiting role, so that the U-shaped block 29 can only perform vertical linear motion;

[0047] The shape of the cleaning plate 211 allows both ends of the cleaning plate 211 to clean the flocculants hanging on the cleaning plate 15 when the U-shaped block 29 is displaced;

[0048] The U-shaped connecting block 212 is provided so that the two cleaning plates 211 become a whole, and the rotating shaft 12 rotates in its U shape without touching the bottom of the U-shaped connecting block 212 .

[0049] like Figures 2 to 4 As shown, the cleaning assembly of this embodiment also includes a slider 22, which slides in the vertical slide block of the guide block 21, and a guide rod 25 is fixedly connected to the top of the slider 22, and a return spring 23 is fixedly connected between the bottom end of the slider 22 and the bottom of the vertical slide block of the guide block 21, and the bottom end of the slider 22 is fixed to the top of the guide rod 24, and the return spring 23 is sleeved on the surface of the guide rod 24, and one end of the slider 22 is fixedly connected to an extension block 27, and the end of the extension block 27 away from the slider 22 is fixedly connected to a guide column 28, and a guide groove 26 is provided on the surface of the rotating shaft 12, and the guide column 28 slides in the guide groove 26, and the guide groove 26 consists of a spiral groove and a straight groove, the top of the spiral groove is connected to the top of the straight groove, and the bottom of the spiral groove is connected to the bottom of the straight groove, and the depth of the spiral groove is different, and its depth gradually decreases from the bottom to the top.

[0050] Specifically, in the initial state, the guide column 28 is located in the straight groove at the bottom of the guide groove 26, and the return spring 1 23 is not deformed. The rotating shaft 12 rotates counterclockwise to make the guide column 28 slide into the spiral groove and move upward under the guidance of the spiral groove, so that the slider 22 slides upward, driving the guide rod 1 24 and the guide rod 25 to move upward, and elastically stretching the return spring 1 23;

[0051] Until the guide column 28 is located at the top of the spiral groove and enters the straight groove, due to the depth difference between the top spiral groove and the straight groove, the guide column 28 can only slide in the straight groove. At this time, under the action of the elastic contraction of the return spring 1 23, when the return spring 1 23 is reset, the guide column 28 slides to the bottom of the straight groove, the slider 22 is reset, and the guide rod 1 24 and the guide rod 2 25 are reset.

[0052] The present invention drives the slider 22 to move up and down by the rotation of the rotating shaft 12 under the action of the guide groove 26 and the guide column 28. When the slider 22 is reset, the guide rod 1 24 abuts against the U-shaped block 29. Under the action of the U-shaped connecting block 212, the two cleaning plates 2 211 are driven to clean all the cleaning plates 15, and then the flocculants hanging on the surface are scraped off, thereby preventing the problem of the cleaning plate 15 rotating slowly during operation, and improving its cleaning efficiency and sedimentation effect.

[0053] like Figure 2 , Figure 6 and Figure 7 As shown, in this embodiment, a feeding assembly is arranged on the top of the sewage treatment tank 1, and the feeding assembly is composed of a storage device and a trigger device. The storage device includes a storage groove 31, and the storage groove 31 is opened at the top of the sewage treatment tank 1. A blocking plate 32 is slidably connected in the storage groove 31. A limiting groove 33 is opened on the top of the sewage treatment tank 1, and a limiting rod 34 is slidably connected in the limiting groove 33. The bottom end of the limiting rod 34 is fixedly connected to the top of the blocking plate 32, and a circular plate 35 is fixedly connected to the top of the limiting rod 34. A compression spring 36 is fixedly connected between the circular plate 35 and the top of the sewage treatment tank 1, and the compression spring 36 is sleeved on the outside of the limiting rod 34. The storage groove 31 is composed of a circular groove one with different diameters connected to a circular groove two, and the circular groove two is connected to the limiting groove 33. The blocking plate 32 is composed of a conical piece and a circular block. The conical piece matches the shape of the circular groove one, and the diameter difference between the circular groove one and the circular groove two is the diameter of the circular block. A plurality of limiting grooves 33 are arranged.

[0054] Specifically, in the initial state, the annular block of the blocking plate 32 abuts against the top of the annular groove 2 of the storage groove 31, and the bottom of the conical piece of the blocking plate 32 abuts against the inner wall of the annular groove 1 of the storage groove 31, so that a closed space is formed inside, and the magnetic powder is stored in the space, and the compression spring 36 is not deformed at this time;

[0055] like Figure 7When the annular plate 35 moves downward under the limiting action of the limiting rod 34 and the limiting groove 33, the compression spring 36 is elastically compressed, and the annular block of the blocking plate 32 is in conflict with the bottom of the annular groove 2 of the storage groove 31 through the limiting rod 34. At this time, the conical piece of the blocking plate 32 does not conflict with the inner wall of the annular ring 1 of the storage groove 31, and there is a gap between them. The magnetic powder in the internal enclosed space is evenly scattered on the surface of the sewage in the sewage treatment tank 1 along the surface of the conical piece of the blocking plate 32, so that the magnetic powder contacts the pollutants in the sewage, thereby forming floccules.

[0056] like Figure 2 , Figure 6 and Figure 7 As shown, the trigger device includes a displacement groove 37, which is opened on the top of the sewage treatment tank 1, and an L-shaped displacement rack rod 38 is slidably connected in the displacement groove 37. One side of the L-shaped displacement rack rod 38 is fixed to the inner ring surface of the circular ring plate 35. A displacement groove 2 39 is opened on the top of the sewage treatment tank 1, and a linear rack rod 310 is slidably connected in the displacement groove 2 39. The displacement groove 1 37 is connected to the middle part of the displacement groove 2 39, and a guide gear 311 is rotatably connected between the connection between the displacement groove 1 37 and the displacement groove 2 39. The guide gear 311 is respectively meshed with the L-shaped displacement rack rod 38 and the linear rack rod 310, and the bottom end of the linear rack rod 310 is fixed to the top of the guide rod 25.

[0057] Specifically, when the guide rod 25 moves upward, the linear rack rod 310 is driven to move synchronously, and the displacement groove 1 37 is moved downward through the guide gear 311, thereby driving the annular plate 35 to move downward.

[0058] When the slider 22 of the present invention moves upward, it pushes the guide gear 311 to move upward, so that a gap is generated between the baffle plate 32 and the storage tank 31, so that the magnetic powder inside can slide out through the conical piece of the baffle plate 32, and the magnetic powder can be evenly scattered in the sewage treatment tank 1, so that the magnetic powder can contact the pollutants in the sewage, thereby forming floccules, which further speeds up the treatment of the sewage.

[0059] The present invention achieves the effect of cleaning the surface of the cleaning plate 15 and adding magnetic powder into the sewage treatment tank 1 through the movement of the slider 22, thereby improving the efficiency of the precipitation and collection of flocculants and accelerating the sewage treatment efficiency. Example 2

[0060] like Figures 1 to 7 As shown, a method for treating wastewater from indigo production according to an embodiment of the present invention comprises the following specific steps:

[0061] Step 1: pretreatment, preparation of aniline acetic acid and potassium hydroxide required for the production of indigo;

[0062] Step 2: Preparation, separation and purification: After condensing anilinoacetic acid and potassium hydroxide, sodium hydroxide is added to carry out an alkali fusion reaction, and then air or oxygen is introduced to generate an indigo solid. The final indigo product is obtained by filtering, washing and drying, and the wastewater generated in the indigo production process is sent to a wastewater treatment device;

[0063] Step 3: Wastewater treatment, after a series of water treatment processes such as pretreatment, flotation filtration, membrane filtration, MVR evaporator concentration, desalination and adsorption, magnetic powder is added to the sewage to make the pollutants in the sewage form flocs, and the precipitation of the flocs is accelerated by stirring the cleaning plate 15, and the precipitated flocs and water are discharged through the sewage outlet 11, and the flocs and water are separated by filtering. At this time, the filtered water meets the national emission standards and can be discharged.

[0064] Working principle:

[0065] The sewage after a series of water treatment processes is discharged into the sewage treatment tank 1 through the water inlet set on the sewage treatment tank 1, and magnetic powder is sprinkled into the sewage. At this time, the driving motor 13 is started to rotate, and the rotating shaft 12 is driven by the driving motor 13 to rotate, so that the cleaning plate 15 starts to rotate, which accelerates the precipitation of floccules formed by magnetic powder and pollutants in the sewage. The bottom of the sewage treatment tank 1 is set to be a depression with a low center and high surroundings. Through the rotation of the cleaning plate 15, the floccules deposited at the bottom of the sewage treatment tank 1 are scraped to the sewage outlet 11. A water pump is set in the sewage outlet 11. The water pump is driven at a fixed time to discharge the floccules and water deposited in the sewage outlet 11. During the rotation of the cleaning plate 15, in the initial state, the guide column 28 is located in the straight groove at the bottom of the guide groove 26, the return spring 1 23 is not deformed, the reciprocating spring 210 is elastically compressed, and the cleaning plate 211 is located at the bottom of the cleaning plate 15;

[0066] The rotating shaft 12 rotates counterclockwise to make the guide post 28 slide into the spiral groove and move upward under the guidance of the spiral groove, so that the slider 22 slides upward, driving the guide rod 1 24 and the guide rod 2 25 to move upward, and elastically stretching the return spring 1 23;

[0067] When the guide rod 25 moves upward, it drives the linear rack rod 310 to move synchronously, and the displacement groove 1 37 moves downward through the guide gear 311, and then drives the annular plate 35 to move downward under the limiting action of the limiting rod 34 and the limiting groove 33, and the compression spring 36 is elastically compressed, and the annular block of the blocking plate 32 is caused to contact the bottom of the annular groove 2 of the storage groove 31 through the limiting rod 34. At this time, the conical piece of the blocking plate 32 does not contact the inner wall of the annular groove 1 of the storage groove 31, and there is a gap between them. At this time, the magnetic powder in the internal closed space follows the surface of the conical piece of the blocking plate 32 and is evenly scattered on the surface of the sewage in the sewage treatment tank 1;

[0068] Until the guide post 28 is located at the top of the spiral groove and enters the straight groove, because there is a depth difference between the top spiral groove and the straight groove, the guide post 28 can only slide in the straight groove. At this time, under the action of the elastic contraction of the return spring 1 23, when the return spring 1 23 is reset, the guide post 28 slides to the bottom of the straight groove, the slider 22 is reset, and the guide rod 1 24 and the guide rod 25 are reset. At this time, the reciprocating spring 210 is reset, so that the U-shaped block 29 moves upward, driving the cleaning plate 211 to move upward;

[0069] As the rotating shaft 12 continues to rotate, the above steps are repeated, thereby controlling the cleaning plate 2 211 to clean the surface of the cleaning plate 1 15 .

[0070] 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 sewage treatment device for indigo production, comprising a sewage treatment tank (1), wherein a sewage outlet (11) is provided at the bottom of the sewage treatment tank (1), a rotating shaft (12) is rotatably connected to the middle of the bottom of the sewage treatment tank (1), a driving motor (13) is fixedly arranged on the top of the rotating shaft (12), a rotating rod (14) is fixedly connected to the surface of the rotating shaft (12), and a cleaning plate (15) is fixedly connected to the bottom of the rotating rod (14), characterized in that: A cleaning assembly is provided inside the sewage treatment box (1), and the cleaning assembly comprises a guide block (21), the guide block (21) is fixedly connected between the inner walls of the sewage treatment box (1), a guide rod (24) is fixedly provided at the bottom end of the guide block (21), a downward pressing device is provided on the rotating rod (14), the downward pressing device comprises a U-shaped block (29), the U-shaped block (29) slides inside the rotating rod (14), the bottom end of the guide rod (24) abuts against the top end of the U-shaped block (29), a reciprocating spring (210) is fixedly connected between the lower surface of the top of the U-shaped block (29) and the top of the rotating rod (14), and a cleaning plate (211) is fixedly connected to the bottom end of the U-shaped block (29), and the downward movement of the guide rod (24) abuts against the operation of the downward pressing device, so that the cleaning plate (211) cleans the floccules remaining on the cleaning plate (15); The U-shaped block (29) is in the shape of a U with its port facing the first cleaning plate (15); the second cleaning plate (211) is in the shape of a U with its port facing one end of the rotating rod (14); the inner walls at both ends of the U are in contact with the surfaces on both sides of the first cleaning plate (15); the pressing device is symmetrically arranged with the rotating shaft (12) as the center; both sides of the two second cleaning plates (211) are fixedly connected with U-shaped connecting blocks (212); the U-shaped connecting blocks (212) are in the shape of a U with its port facing the second cleaning plate (211); The cleaning assembly also includes a slider (22), the slider (22) slides in the vertical slide block of the guide block (21), the top of the slider (22) is fixedly connected to a guide rod 2 (25), a return spring 1 (23) is fixedly connected between the bottom of the slider (22) and the bottom of the vertical slide block of the guide block (21), the bottom of the slider (22) is fixed to the top of the guide rod 1 (24), the return spring 1 (23) is sleeved on the surface of the guide rod 1 (24), one end of the slider (22) is fixedly connected to an extension block (27), the end of the extension block (27) away from the slider (22) is fixedly connected to a guide column (28), the surface of the rotating shaft (12) is provided with a guide groove (26), and the guide column (28) slides in the guide groove (26).

2. The wastewater treatment equipment for indigo production according to claim 1, characterized in that: The rotating shaft (12) passes through the top of the sewage treatment tank (1); the top end of the rotating shaft (12) is fixedly connected to the output end of the driving motor (13); the rotating rod (14) is close to the bottom end of the rotating shaft (12); and a plurality of cleaning plates (15) are provided, and the plurality of cleaning plates (15) are symmetrically arranged with the rotating shaft (12) as the center.

3. The wastewater treatment equipment for indigo production according to claim 1, characterized in that: The guide block (21) is in the shape of a cross and is composed of a vertical slide block and two transverse fixing rods, wherein the ends of the two transverse fixing rods away from the vertical slide block are respectively fixed to the inner walls on both sides of the sewage treatment tank (1).

4. The wastewater treatment equipment for indigo production according to claim 1, characterized in that: The guide groove (26) consists of a spiral groove and a straight groove, the top of the spiral groove is connected to the top of the straight groove, the bottom of the spiral groove is connected to the bottom of the straight groove, and the depth of the spiral groove is different, and the depth gradually decreases from the bottom to the top.

5. The wastewater treatment equipment for indigo production according to claim 1, characterized in that: A feeding assembly is arranged on the top of the sewage treatment box (1), and the feeding assembly is composed of a storage device and a trigger device. The storage device comprises a storage slot (31), and the storage slot (31) is arranged on the top of the sewage treatment box (1). A blocking plate (32) is slidably connected in the storage slot (31). A limiting slot (33) is arranged on the top of the sewage treatment box (1), and a limiting rod (34) is slidably connected in the limiting slot (33). The bottom end of the limiting rod (34) is fixedly connected to the top of the blocking plate (32), and the top end of the limiting rod (34) is fixedly connected to a circular plate (35). A compression spring (36) is fixedly connected between the circular plate (35) and the top of the sewage treatment box (1), and the compression spring (36) is sleeved outside the limiting rod (34).

6. The wastewater treatment equipment for indigo production according to claim 5, characterized in that: The storage groove (31) is composed of a circular groove 1 and a circular groove 2 of different diameters connected to each other, the circular groove 2 is connected to the limiting groove (33), the blocking plate (32) is composed of a conical sheet and a circular ring block, the conical sheet matches the shape of the circular groove 1, the diameter difference between the circular groove 1 and the circular groove 2 is the diameter of the circular ring block, and a plurality of limiting grooves (33) are provided.

7. The wastewater treatment equipment for indigo production according to claim 6, characterized in that: The trigger device comprises a displacement groove (37), the displacement groove (37) being provided at the top of the sewage treatment tank (1), an L-shaped displacement rack rod (38) being slidably connected in the displacement groove (37), one side of the L-shaped displacement rack rod (38) being fixed to the inner ring surface of the circular ring plate (35), a displacement groove (39) being provided at the top of the sewage treatment tank (1), a linear rack rod (310) being slidably connected in the displacement groove (39), the displacement groove (37) being connected to the middle part of the displacement groove (39), a guide gear (311) being rotatably connected between the connection point between the displacement groove (37) and the displacement groove (39), the guide gear (311) being respectively meshed with the L-shaped displacement rack rod (38) and the linear rack rod (310), the bottom end of the linear rack rod (310) being fixed to the top of the guide rod (25).

8. A method for treating wastewater from indigo production according to any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: pretreatment, preparation of aniline acetic acid and potassium hydroxide required for the production of indigo; Step 2: Preparation, separation and purification: After condensing anilinoacetic acid and potassium hydroxide, sodium hydroxide is added to carry out an alkali fusion reaction, and then air or oxygen is introduced to generate an indigo solid. The final indigo product is obtained by filtering, washing and drying, and the wastewater generated in the indigo production process is sent to a wastewater treatment device; Step 3: Wastewater treatment, after a series of water treatment processes such as pretreatment, air flotation filtration, membrane filtration, MVR evaporator concentration, desalination and adsorption, magnetic powder is added to the sewage to make the pollutants in the sewage form flocs, and the precipitation of the flocs is accelerated by stirring the cleaning plate (15), and the precipitated flocs and water are discharged through the sewage outlet (11), and filtered to separate the flocs and water. At this time, the filtered water meets the national emission standards and can be discharged.

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