Coal tar wastewater treatment device and method

Abstract

The invention relates to a coal tar wastewater treatment device and method, and relates to the technical field of wastewater treatment.The coal tar wastewater treatment device comprises a machine body, a plurality of fixing rods are fixedly connected to the bottom of the machine body, and the lower ends of the fixing rods are jointly connected with a base. According to the coal tar wastewater treatment device and method, large-particle impurities such as wood blocks and fibers in wastewater can be effectively intercepted, the mixing uniformity of a coagulant and the wastewater is improved, flowing dead angles are reduced, the utilization rate of the coagulant is increased, the treatment load of subsequent equipment is reduced, meanwhile, impurities blocked in the top of the buffer tank can be cut off and cleaned in time, and the service life of the equipment is prolonged. The device has the advantages that the through holes are prevented from being blocked by oil sludge or floc, the flow fluctuation and concentration difference of wastewater are balanced, the device adapts to floating oil layers with different thicknesses, floating oil and impurities at the inner edge of the device body are gathered towards the oil suction pipe, the floating oil is accurately separated, gathering dead angles are reduced, and pollutants in the wastewater can be conveniently treated in a targeted manner subsequently; the coal tar wastewater pretreatment efficiency and stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a device and method for treating coal tar wastewater. Background Art

[0002] Coal tar wastewater is a high-concentration organic wastewater produced during coal distillation, coal gas purification and tar processing. Its composition is extremely complex and contains a large amount of pollutants such as phenols, polycyclic aromatic hydrocarbons, tar, cyanide, ammonia nitrogen, etc. It is highly toxic, difficult to degrade, and has a high pollution load. If discharged directly, it will cause serious harm to water bodies, soil and the ecological environment, and threaten human health.

[0003] In existing technologies, coal tar wastewater is typically treated through a combination of pretreatment, biochemical treatment, and advanced treatment. The pretreatment stage typically requires the coordinated operation of multiple devices, resulting in a long treatment cycle and low efficiency. Furthermore, the addition of coagulants can easily lead to uneven dispersion and mixing, resulting in reduced utilization. Fine suspended matter and colloids in the wastewater cannot fully aggregate into flocs, increasing the load on subsequent treatment units. Furthermore, the accumulation of sludge and flocs can easily clog water flow channels, compromising overall treatment effectiveness. In light of these issues, the present invention provides a coal tar wastewater treatment device and method. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a coal tar wastewater treatment device and method to solve the problems in the prior art of low coal tar wastewater pretreatment efficiency and easy blockage of flow channels due to sludge and flocs.

[0005] The present invention is achieved through the following technical solutions: A coal tar wastewater treatment device and method, comprising a body, a plurality of fixing rods fixedly connected to the bottom of the body, the lower ends of the plurality of fixing rods being commonly connected to a base, a conical seat being provided at the bottom of the body, a sewage pipe being connected below the conical seat, a water outlet pipe being connected on the side wall of the body, a material storage box being fixedly mounted on the side wall of the body, and a material outlet pipe being connected on the side of the material storage box away from the body; A buffer box is fixedly installed inside the body, and the buffer box includes a box body. The bottom of the box body is connected to an extension box, and the extension box is arranged below the body. A top cover is provided on the top of the box body, and a dredging mechanism is provided on the top cover. A salvage mechanism is provided on one side of the dredging mechanism, and a demulsification mechanism is provided on the side of the salvage mechanism away from the dredging mechanism. The demulsification mechanism is provided in the body and above the conical seat. A separation mechanism is provided on one side of the demulsification mechanism, and the separation mechanism includes a dissolved air pump, a dissolved air pipe and a releaser, and the releaser is provided above the conical seat. A scraping mechanism is provided above the body.

[0006] Furthermore, a water inlet pipe and a liquid infusion pipe are connected to the buffer tank, and the water inlet pipe is located below the liquid infusion pipe. Both the water inlet pipe and the liquid infusion pipe are sealed and connected to the side wall of the body. A flange is installed at one end of the water inlet pipe and the liquid infusion pipe extending outside the body. A water inlet is provided between the box body and the extension box, and a plurality of grilles are provided at the water inlet. One end of the water inlet pipe located in the box body is connected to the grille and extends into the extension box. A conveying pipe is provided through the side wall of the extension box and is in communication with the interior thereof, and a screw conveyor is provided at one end of the conveying pipe away from the extension box; A plurality of guide plates are fixedly connected to the inner wall of the box body. The guide plates are all configured as arc-shaped plates, and are arranged at equal distances from each other.

[0007] Furthermore, the top cover is detachably connected to the top of the box body by multiple sets of bolts, a cavity is defined in the top cover, and multiple through holes are defined at the upper and lower ends of the cavity.

[0008] Furthermore, the dredging mechanism includes a motor box installed above the top cover, and a first motor is provided in the motor box, an output shaft of the first motor is connected to a transmission shaft through a coupling, and two paddles are symmetrically provided on the transmission shaft, and both paddles are located in a cavity opened on the top cover; The transmission shaft extends into one end of the box body and is circumferentially provided with a plurality of blades.

[0009] Furthermore, the salvage mechanism includes a connecting plate fixedly connected to the top of the motor box, and two support plates are symmetrically provided at one end of the connecting plate away from the motor box, and one end of the two support plates away from the connecting plate is fixedly connected to the top side wall of the body; An electric push rod is provided through the connecting plate, a telescopic end of the electric push rod is connected to an oil suction pipe, a connecting pipe connected to the interior of the oil suction pipe is provided through the side wall of the oil suction pipe, and a tray is provided at the bottom of the oil suction pipe.

[0010] Furthermore, the tray is configured to be semicircular, and a plurality of connecting rods are circumferentially arranged between the axis of the tray and the oil suction pipe. A plurality of grooves are circumferentially arranged on the inner wall of the tray, and the plurality of grooves are respectively arranged between two adjacent connecting rods at corresponding positions.

[0011] Furthermore, the demulsification mechanism includes a vertical plate arranged inside the body, and the bottom of the vertical plate is fixedly connected to the bottom inner wall of the body, and the side wall of the vertical plate is installed with an electrode sheet; A torsion spring shaft is installed on the top of the vertical plate, a movable plate is provided on the upper end of the torsion spring shaft, and a through slot is provided on the movable plate.

[0012] Furthermore, the scraping mechanism includes two assembly boxes symmetrically arranged on the top of the machine body, sprockets and chains are respectively arranged inside the two assembly boxes, and a transmission rod is commonly connected between the two sprockets at corresponding positions; A second motor is fixedly mounted on one side of one of the assembly boxes, and an output shaft of the second motor is connected to a sprocket key at a corresponding position via a coupling.

[0013] Furthermore, a plurality of positioning rods are provided between the two assembly boxes, the plurality of positioning rods are respectively connected to the chains on both sides through brackets, and the plurality of positioning rods are arranged equidistantly, and scrapers are respectively fixedly connected to the plurality of positioning rods, and the plurality of scrapers are all arranged at an angle.

[0014] A method for treating coal tar wastewater comprises the following steps: Step S1: The coal tar wastewater to be treated is directly delivered to the buffer tank through the connected water inlet pipe, and large particles of impurities such as wood blocks and fibers in the wastewater are intercepted to prevent subsequent equipment from being blocked. A coagulant is added through the infusion pipe to mix the wastewater with the coagulant to initially remove pollutants; Step S2: Wastewater flows into the body through the through-hole opened on the top cover, and the output shaft of the first motor and the transmission shaft drive the paddles on the top of the box body to rotate, and cooperate with the multiple guide plates provided on the side walls of the box body to guide the wastewater, reduce the flow dead angle, and ensure that the wastewater and the coagulant fully react. At the same time, the transmission shaft drives the paddle provided in the cavity to rotate, intercepting and cleaning the impurities blocked in the through-hole, and ensuring that the wastewater is smoothly discharged from the top of the buffer tank; Step S3: The wastewater flows between the buffer tank and the demulsification mechanism, and the electric push rod is started. The telescopic end of the electric push rod drives the entire tray to move, and the floating oil and impurities on the top layer of the wastewater are absorbed through the oil suction pipe to reduce the subsequent processing load. The electrode sheet contacts the wastewater to destroy the stable electrical layer structure of the emulsified oil, causing the emulsified oil to aggregate into large-sized free oil droplets, which is convenient for subsequent separation; Step S4: A large number of microbubbles are introduced into the wastewater through a releaser. The bubbles are adsorbed and combined with the free oil droplets, suspended particles and flocs after demulsification through van der Waals forces to form a complex that floats to the water surface to form scum; Step S5: Start the second motor to run, cooperate with the transmission of the sprocket and chain, and the positioning rod drives the scraper to move to scrape off the scum floating on the surface of the wastewater, push the scum into the storage box and discharge it outward through the discharge pipe. Finally, the treated wastewater is discharged from the outlet pipe.

[0015] The beneficial effects of the present invention are: The coal tar wastewater treatment device and method can effectively intercept large particles of impurities such as wood blocks and fibers in the wastewater through the cooperation of the grille and the guide plate in the buffer box, avoid the accumulation of impurities and blockage affecting the subsequent transportation of wastewater, and the impurities can be automatically discharged. The stirring effect of the synergistic blades can improve the mixing uniformity of the coagulant and the wastewater, reduce the flow dead angle, improve the utilization rate of the coagulant, and preliminarily and effectively remove the impurities in the wastewater, reducing the processing load of the subsequent equipment. At the same time, the first motor drives the paddle to rotate, which can timely intercept and clean the impurities blocked in the top of the buffer box, avoid the through hole from being blocked by oil sludge or flocs, and balance the flow fluctuation and concentration difference of the wastewater. The electric push rod drives the tray to move, which can adapt to floating oil layers of different thicknesses, and makes the floating oil and impurities at the edge of the body converge to the oil suction pipe, accurately separate the floating oil and reduce the accumulation dead angle, facilitate the subsequent targeted treatment of pollutants in the wastewater, and improve the efficiency and stability of coal tar wastewater pretreatment.

[0016] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 It is an isometric structural diagram of the present invention; Figure 3 It is a schematic cross-sectional view of the present invention; Figure 4 Schematic diagram of the internal structure of the body of the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the buffer box of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the top cover of the present invention; Figure 7 It is a structural schematic diagram of the salvage mechanism of the present invention; Figure 8 It is a structural schematic diagram of the demulsification mechanism and the releaser of the present invention; Figure 9 It is a left side structural schematic diagram of the scraping mechanism of the present invention; Figure 10 It is a right side structural schematic diagram of the scraping mechanism of the present invention.

[0018] In the figure: 1, machine body; 11, fixing rod; 12, base; 13, conical seat; 131, sewage pipe; 14, water outlet pipe; 15, storage box; 151, discharge pipe; 2. Buffer box; 21. Box body; 211. Water inlet pipe; 212. Infusion pipe; 22. Extension box; 221. Delivery pipe; 222. Screw conveyor; 23. Grille; 24. Guide plate; 25. Top cover; 251. Cavity; 252. Through hole; 3. Dredging mechanism; 31. First motor; 32. Transmission shaft; 33. Paddle; 34. Paddle; 4. Salvage mechanism; 41. Connecting plate; 42. Support plate; 43. Electric push rod; 44. Oil suction pipe; 45. Connecting pipe; 46. Tray; 461. Groove; 5. Demulsification mechanism; 51. Vertical plate; 52. Electrode sheet; 53. Torsion spring shaft; 54. Movable plate; 541. Through slot; 6. Separation mechanism; 61. Dissolving gas tube; 62. Releaser; 7. Scraping mechanism; 71. Assembly box; 72. Transmission rod; 73. Second motor; 74. Positioning rod; 75. Scraper. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0022] In the above description of the present invention, it should be noted that the terms "one side," "the other side," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the term "identical" and similar terms do not necessarily require that the components be absolutely identical; slight variations are permitted. The term "perpendicular" simply refers to the positional relationship between components being more perpendicular than "parallel," not that the structure must be perfectly vertical; rather, it can be slightly tilted.

[0024] See also Figures 1 to 4 The present invention provides a technical solution: a coal tar wastewater treatment device, comprising a body 1, a plurality of fixed rods 11 are fixedly connected to the bottom of the body 1, the lower ends of the plurality of fixed rods 11 are commonly connected to a base 12, a conical seat 13 is provided at the bottom of the body 1, and a sewage pipe 131 is connected below the conical seat 13, a water outlet pipe 14 is connected on the side wall of the body 1, a storage box 15 is fixedly installed on the side wall of the body 1, and a discharge pipe 151 is connected on the side of the storage box 15 away from the body 1, a buffer box 2 is fixedly installed inside the body 1, the buffer box 2 comprises a box body 21, an extension box 22 is connected to the bottom of the box body 21, and the extension box 22 is arranged below the body 1, a water inlet pipe 211 and a liquid delivery pipe 212 are connected on the buffer box 2, and the water inlet pipe 211 is located below the infusion pipe 212, and the water inlet pipe 211 and the infusion pipe 212 are both sealed and connected to the side wall of the body 1. A flange is installed on one end of the water inlet pipe 211 and the infusion pipe 212 extending to the outside of the body 1. A water inlet is opened between the box body 21 and the extension box 22, and multiple groups of grilles 23 are provided at the water inlet. One end of the water inlet pipe 211 located in the box body 21 is connected to the grille 23 and extends into the extension box 22. A delivery pipe 221 connected to the interior of the extension box 22 is provided on the side wall of the extension box 22, and a screw conveyor 222 is provided on the end of the delivery pipe 221 away from the extension box 22. A plurality of guide plates 24 are fixedly connected to the inner wall of the box body 21, and the plurality of guide plates 24 are all configured as arc-shaped plates, and the plurality of guide plates 24 are arranged equidistantly.

[0025] Specifically, when treating coal tar wastewater, the wastewater is transported to the buffer box 2 through the water inlet pipe 211. Since the end of the water inlet pipe 211 extends to the bottom of the grille 23, the multiple grilles 23 arranged in parallel can intercept larger impurities in the wastewater, causing the impurities to fall to the bottom of the extension box 22, and the impurities are transported to the screw conveyor 222 through the conveying pipe 221. Since the pipe at the top of the screw conveyor 222 is connected to the outside, under the action of external pressure, the impurities can be directly discharged to the outside of the body 1 through the screw conveyor 222, and the wastewater is preliminarily filtered.

[0026] In addition, wastewater enters the box 21 through the grille 23, and at the same time, a coagulant is added to the box 21 through the infusion pipe 212. The coagulant directly reacts with the wastewater in the box 21, and relies on the colloidal particles produced by the hydrolysis of the coagulant to aggregate fine impurities into large flocs through adsorption or bridging, and falls downward into the extension box 22 by its own gravity. It should be noted that when the first motor 31 is started, the output shaft of the first motor 31 can drive the multiple blades 34 inside the box 21 to rotate through the transmission shaft 32, thereby stirring the wastewater inside the box 21, and coordinating with the multiple guide plates 24 arranged on the inner wall of the box 21, so that the wastewater forms multiple local flow fields, which is convenient for mixing the coagulant and the wastewater, saving the amount of coagulant, and ensuring the effective removal of residual suspended matter, colloids and part of COD, reducing the subsequent process processing load.

[0027] To ensure that the wastewater flows out smoothly from the top after entering the buffer tank 2, refer to Figure 5 and Figure 6 , a top cover 25 is provided on the top of the box body 21, and the top cover 25 is detachably connected to the top of the box body 21 by multiple sets of bolts, a cavity 251 is opened in the top cover 25, and a plurality of through holes 252 are respectively opened at the upper and lower ends of the cavity 251, and a dredging mechanism 3 is provided on the top cover 25, and the dredging mechanism 3 includes a motor box installed above the top cover 25, and a first motor 31 is arranged in the motor box, and the output shaft of the first motor 31 is connected to the transmission shaft 32 through a coupling, and two paddles 33 are symmetrically provided on the transmission shaft 32, and the two paddles 33 are both located in the cavity 251 opened on the top cover 25, and a plurality of paddles 34 are circumferentially provided on one end of the transmission shaft 32 extending into the box body 21. It should be noted that the wastewater flows to the top cover 25 on the top of the buffer tank 2, and is finally discharged outward from the through holes 252 opened on the top cover 25 into the body 1. During the discharge process, the distance between adjacent through holes 252 near the edge of the top cover 25 is increased through the multiple groups of through holes 252 arranged circumferentially, and the guidance of the top flow field is reduced, which facilitates the wastewater to diffuse around the buffer box 2, balances the flow fluctuation and concentration difference of the wastewater, and provides stable water inlet conditions for subsequent treatment. Furthermore, when the first motor 31 is running, the output shaft of the first motor 31 will drive the two symmetrically arranged paddles 33 to rotate through the transmission shaft 32. The edge of the paddle 33 contacts the inner wall of the cavity 251, and the thickness of the paddle 33 is equal to the height of the cavity 251. Therefore, during the rotation of the paddle 33, it can cut off the impurities blocked between the through holes 252, and the impurities trapped in the cavity 251 can be discharged outward through the through holes 252 to avoid blockage at the top cover 25 affecting the flow of wastewater.

[0028] Reference Figure 7 A salvaging mechanism 4 is provided on one side of the dredging mechanism 3. The embodiment of the salvaging mechanism 4 is as follows: The salvage mechanism 4 includes a connecting plate 41 fixedly connected to the top of the motor box, and two support plates 42 are symmetrically provided at one end of the connecting plate 41 away from the motor box. The ends of the two support plates 42 away from the connecting plate 41 are fixedly connected to the top side wall of the body 1. An electric push rod 43 is passed through the connecting plate 41, and the telescopic end of the electric push rod 43 is connected to an oil suction pipe 44. A connecting pipe 45 communicating with the interior of the oil suction pipe 44 is passed through the side wall of the oil suction pipe 44, and a tray 46 is provided at the bottom of the oil suction pipe 44. The tray 46 is set in a semicircular shape, and a plurality of connecting rods are circumferentially provided between the axis of the tray 46 and the oil suction pipe 44. A plurality of grooves 461 are circumferentially provided on the inner wall of the tray 46, and the plurality of grooves 461 are respectively provided between two adjacent connecting rods at corresponding positions. It should be noted that the electric The push rod 43 and the tray 46 are installed above the water surface. When the electric push rod 43 is started, the telescopic end of the electric push rod 43 will drive the tray 46 to move downward as a whole. The lower surface of the tray 46 pushes the impurities floating on the surface of the wastewater to flow to the edge of the body 1, and drives the water below to flow, so that the wastewater can better contact with the electrode sheet 52. According to the thickness of the floating oil on the surface of the wastewater, after adjusting the tray 46 to a suitable height, the floating oil and impurities will enter the tray 46, and the floating oil and impurities will be extracted through the gap between the oil suction pipe 44 and the multiple connecting rods at the center of the tray 46, and transported to the outside of the body 1 through the connecting pipe 45. At the same time, relying on the up and down movement of the tray 46, the impurities close to the inner wall of the body 1 will flow into the tray 46, reducing the dead corners of accumulation, and efficiently separating the floating oil and wastewater, which is convenient for subsequent targeted treatment of substances in the wastewater.

[0029] Reference Figure 8, further, in the optimization and improvement of the above scheme, a demulsification mechanism 5 is provided on the side of the salvage mechanism 4 away from the dredging mechanism 3, and the demulsification mechanism 5 is provided in the body 1 and above the conical seat 13. The demulsification mechanism 5 includes a vertical plate 51 provided inside the body 1, and the bottom of the vertical plate 51 is fixedly connected to the bottom inner wall of the body 1, an electrode sheet 52 is installed on the side wall of the vertical plate 51, a torsion spring shaft 53 is installed on the top of the vertical plate 51, a movable plate 54 is provided on the upper end of the torsion spring shaft 53, and a through slot 541 is opened on the movable plate 54. It should be noted that by arranging the electrode sheet 52 on the side wall of the vertical plate 51, the electrode sheet 52 can be energized. It can quickly destroy the stable film of emulsified oil in the wastewater, causing the emulsified oil droplets to gather and become larger, which is convenient for subsequent flotation treatment. In addition, a movable plate 54 is set on the top of the vertical plate 51 through the torsion spring shaft 53. In the subsequent scraping process, the scraper 75 moves to one side of the movable plate 54. As the scraper 75 continues to move, the scraper 75 contacts the movable plate 54 and pushes the movable plate 54 to flip over, thereby relying on the end of the movable plate 54 and the through groove 541 opened thereon to clean the surface of the scraper 75, scrape off the impurities attached to the side wall of the scraper 75, and collect and clean the scraped impurities through the tray 46, thereby improving the efficiency of scum treatment.

[0030] Reference Figure 3 and Figure 8 A separation mechanism 6 is provided on one side of the demulsification mechanism 5. The separation mechanism 6 includes an air dissolving pump, an air dissolving pipe 61 and a releaser 62. The releaser 62 is provided above the conical seat 13. The air is dissolved in water by the air dissolving pump to form high-pressure air-dissolved water, which is transported to the releaser 62 through the air dissolving pipe 61. With the continuous transportation of wastewater, the wastewater flows between the bottom of the vertical plate 51 and the conical seat 13, and the air-dissolved water is released into the body 1 through multiple releasers 62 arranged at equal intervals. The microbubbles generated after the air-dissolved water is depressurized can be fully mixed with the wastewater, thereby being adsorbed on the surface of the emulsified oil and suspended matter, making their overall density less than that of water and floating.

[0031] Reference Figure 9 and Figure 10 A scraping mechanism 7 is provided above the machine body 1. Furthermore, in the above technical solution, an embodiment of the scraping mechanism 7 is as follows: The scraper mechanism 7 includes two assembly boxes 71 symmetrically arranged on the top of the machine body 1. Sprockets and chains are respectively arranged inside the two assembly boxes 71. A transmission rod 72 is commonly connected between the two sprockets at corresponding positions. A second motor 73 is fixedly installed on one side of one assembly box 71, and the output shaft of the second motor 73 is connected to the sprocket key at the corresponding position through a coupling. A plurality of positioning rods 74 are provided between the two assembly boxes 71. The plurality of positioning rods 74 are respectively connected to the chains on both sides through brackets, and the plurality of positioning rods 74 are equidistantly arranged. Scrapers 75 are respectively fixedly connected to the plurality of positioning rods 74. , and multiple scrapers 75 are all tilted. It should be noted that when the second motor 73 is started, the output shaft of the second motor 73 will drive the sprocket in the assembly box 71 to rotate, and with the connection of the transmission rod 72, the chains on both sides will jointly drive the positioning rod 74 between them to move, and the scrapers 75 tilted on the positioning rod 74 move synchronously, thereby scraping off the scum floating on the surface of the wastewater, and finally pushing the scum into the storage box 15, and discharging the scum accumulated in the storage box 15 through the discharge pipe 151, completing the pretreatment of the wastewater, and the wastewater is transported to subsequent equipment through the outlet pipe 14.

[0032] like Figures 1 to 3 As shown, the present invention also provides a method for treating coal tar wastewater, which is applied to the coal tar wastewater treatment device as described in the above embodiment, and the method comprises the following steps: Step S1: The coal tar wastewater to be treated is directly delivered to the buffer tank 2 through the connected water inlet pipe 211, and large particles of impurities such as wood and fiber in the wastewater are intercepted to prevent subsequent equipment from being blocked. A coagulant is added through the infusion pipe 212 to mix the wastewater and the coagulant to initially remove pollutants. Step S2: Wastewater flows into the body 1 through the through hole 252 opened on the top cover 25, and the output shaft of the first motor 31 and the transmission shaft 32 drive the paddle 34 on the top of the box 21 to rotate, and cooperate with the multiple guide plates 24 provided on the side wall of the box 21 to guide the wastewater, reduce the flow dead angle, and ensure that the wastewater and the coagulant fully react. At the same time, the transmission shaft 32 drives the paddle 33 provided in the cavity 251 to rotate, intercepting and cleaning the impurities blocked in the through hole 252, and ensuring that the wastewater is smoothly discharged from the top of the buffer tank 2; Step S3: The wastewater flows between the buffer tank 2 and the demulsification mechanism 5, and the electric push rod 43 is started. The telescopic end of the electric push rod 43 drives the tray 46 to move as a whole, and the floating oil and impurities on the top layer of the wastewater are sucked out through the oil suction pipe 44 to reduce the subsequent processing load. The electrode sheet 52 contacts the wastewater to destroy the stable electrical layer structure of the emulsified oil, causing the emulsified oil to aggregate into large-sized free oil droplets, which is convenient for subsequent separation. Step S4: A large number of microbubbles are introduced into the wastewater through the releaser 62. The bubbles are adsorbed and combined with the free oil droplets, suspended particles and flocs after demulsification through van der Waals forces to form a complex that floats to the water surface to form scum; Step S5: Start the second motor 73 to run, cooperate with the transmission of the sprocket and chain, the positioning rod 74 drives the scraper 75 to move, scrape off the scum floating to the surface of the wastewater, push the scum into the storage box 15 and discharge it outward through the discharge pipe 151, and finally the treated wastewater is discharged from the outlet pipe 14.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A coal tar wastewater treatment device, comprising a body (1), characterized in that: A buffer box (2) is fixedly installed inside the body (1), a dredging mechanism (3) is provided at the upper end of the buffer box (2), a salvaging mechanism (4) for absorbing floating oil is provided on one side of the dredging mechanism (3), a demulsification mechanism (5) is provided on the side of the salvaging mechanism (4) away from the dredging mechanism (3), the demulsification mechanism (5) is provided in the body (1), a separation mechanism (6) for releasing high-pressure dissolved air water is provided on the body (1), the separation mechanism (6) comprises a dissolved air pump, a dissolved air pipe (61) and a releaser (62), and the releaser (62) is provided in the body (1), and a scraping mechanism (7) is provided on the top of the body (1); The salvage mechanism (4) comprises a connecting plate (41), an electric push rod (43) is provided through the connecting plate (41), a telescopic end of the electric push rod (43) is connected to an oil suction pipe (44), and a connecting pipe (45) is provided through the oil suction pipe (44) and communicated with the interior thereof.

2. A coal tar wastewater treatment device according to claim 1, characterized in that: The bottom of the machine body (1) is fixedly connected to a plurality of fixing rods (11), and the lower ends of the plurality of fixing rods (11) are commonly connected to a base (12). A conical seat (13) is provided at the bottom of the machine body (1), and a sewage pipe (131) is provided below the conical seat (13). A water outlet pipe (14) is provided on the side wall of the machine body (1). A material storage box (15) is fixedly installed on the side wall of the machine body (1), and a material outlet pipe (151) is provided on the side of the material storage box (15) away from the machine body (1).

3. A coal tar wastewater treatment device according to claim 1, characterized in that: The buffer box (2) is connected to a water inlet pipe (211) and a liquid delivery pipe (212), and the water inlet pipe (211) is located below the liquid delivery pipe (212). The water inlet pipe (211) and the liquid delivery pipe (212) are both sealed and connected to the side wall of the body (1). A flange is installed at one end of the water inlet pipe (211) and the liquid delivery pipe (212) extending outside the body (1); The buffer box (2) comprises a box body (21), the bottom of the box body (21) is connected to an extension box (22), and the extension box (22) is arranged below the machine body (1), and the top of the box body (21) is provided with a top cover (25); A water inlet is provided between the box body (21) and the extension box (22), and a plurality of grids (23) are provided at the water inlet. One end of the water inlet pipe (211) located in the box body (21) is connected to the grid (23) and extends into the extension box (22). A conveying pipe (221) is provided through the side wall of the extension box (22) and is in communication with the interior thereof; an end of the conveying pipe (221) away from the extension box (22) is in communication with a screw conveyor (222); A plurality of guide plates (24) are fixedly connected to the inner wall of the box body (21), the plurality of guide plates (24) are all configured as arc-shaped plates, and the plurality of guide plates (24) are arranged at equal distances; The top cover (25) is detachably connected to the top of the box body (21) via multiple sets of bolts. A cavity (251) is provided in the top cover (25), and multiple through holes (252) are respectively provided at the upper and lower ends of the cavity (251).

4. A coal tar wastewater treatment device according to claim 3, characterized in that: The dredging mechanism (3) includes a motor box installed above the top cover (25), and a first motor (31) is arranged in the motor box. The output shaft of the first motor (31) is connected to a transmission shaft (32) via a coupling. Two paddles (33) are symmetrically arranged on the transmission shaft (32), and the two paddles (33) are both located in a cavity (251) opened on the top cover (25); One end of the transmission shaft (32) extending into the box (21) is circumferentially provided with a plurality of blades (34).

5. A coal tar wastewater treatment device according to claim 4, characterized in that: One end of the connecting plate (41) is fixedly connected to the top of the motor box, and two support plates (42) are symmetrically provided at the other end of the connecting plate (41), and one end of the two support plates (42) away from the connecting plate (41) is fixedly connected to the top side wall of the body (1); A tray (46) is provided at the bottom of the oil suction pipe (44).

6. A coal tar wastewater treatment device according to claim 5, characterized in that: The tray (46) is arranged in a semicircular shape, and a plurality of connecting rods are circumferentially arranged between the axis of the tray (46) and the oil suction pipe (44). A plurality of grooves (461) are circumferentially arranged on the inner wall of the tray (46), and the plurality of grooves (461) are respectively arranged between two adjacent connecting rods at corresponding positions.

7. A coal tar wastewater treatment device according to claim 1, characterized in that: The demulsification mechanism (5) comprises a vertical plate (51) arranged inside the body (1), and the bottom of the vertical plate (51) is fixedly connected to the bottom inner wall of the body (1), and an electrode sheet (52) is installed on the side wall of the vertical plate (51); A torsion spring rotating shaft (53) is installed on the top of the vertical plate (51), a movable plate (54) is provided at the upper end of the torsion spring rotating shaft (53), and a through slot (541) is provided on the movable plate (54).

8. The coal tar wastewater treatment device according to claim 1, characterized in that: The scraping mechanism (7) comprises two assembly boxes (71) symmetrically arranged on the top of the machine body (1), sprockets and chains are respectively arranged inside the two assembly boxes (71), and a transmission rod (72) is commonly connected between the two sprockets at corresponding positions; A second motor (73) is fixedly mounted on one side of one of the assembly boxes (71), and an output shaft of the second motor (73) is connected to a sprocket key at a corresponding position via a coupling.

9. A coal tar wastewater treatment device according to claim 8, characterized in that: A plurality of positioning rods (74) are provided between the two assembly boxes (71), the plurality of positioning rods (74) are respectively connected to the chains on both sides through brackets, and the plurality of positioning rods (74) are arranged at equal distances, and a scraper (75) is respectively fixedly connected to the plurality of positioning rods (74), and the plurality of scrapers (75) are all arranged at an angle.

10. A method for treating coal tar wastewater, characterized in that: The method is applied to the coal tar wastewater treatment device according to any one of the above claims, and the method comprises the following steps: Step S1: directly delivering the coal tar wastewater to be treated to the buffer tank (2) through the connected water inlet pipe (211), intercepting large particles of impurities such as wood blocks and fibers in the wastewater to prevent subsequent equipment from being blocked, and adding a coagulant through the infusion pipe (212) to mix the wastewater and the coagulant to preliminarily remove pollutants, thereby providing stable water inlet conditions for subsequent treatment; Step S2: wastewater flows into the body (1) through the through hole (252) provided on the top cover (25), and the output shaft of the first motor (31) and the transmission shaft (32) drive the paddle (34) on the top of the box (21) to rotate, and cooperate with the multiple guide plates (24) provided on the side wall of the box (21) to guide the wastewater, reduce the flow dead angle, and ensure that the wastewater and the coagulant fully react. At the same time, the transmission shaft (32) drives the paddle (33) provided in the cavity (251) to rotate, intercepts and cleans the impurities blocked in the through hole (252), and ensures that the wastewater is smoothly discharged from the top of the buffer box (2); Step S3: The wastewater flows between the buffer tank (2) and the demulsification mechanism (5), and the electric push rod (43) is started to operate. The telescopic end of the electric push rod (43) drives the tray (46) to move as a whole, and the floating oil and impurities on the top layer of the wastewater are absorbed through the oil suction pipe (44), thereby reducing the subsequent processing load. The electrode sheet (52) contacts the wastewater to destroy the stable electrical layer structure of the emulsified oil, causing the emulsified oil to aggregate into large-sized free oil droplets, which is convenient for subsequent separation; Step S4: a large number of microbubbles are introduced into the wastewater through the releaser (62), and the bubbles are adsorbed and combined with the free oil droplets, suspended particles and flocs after demulsification through van der Waals forces to form a complex that floats to the water surface to form scum; Step S5: The second motor (73) is started to operate, and the positioning rod (74) drives the scraper (75) to move in conjunction with the transmission of the sprocket and the chain, so as to scrape off the scum floating on the surface of the wastewater, push the scum into the storage box (15) and discharge it outward through the discharge pipe (151), and finally the treated wastewater is discharged from the outlet pipe (14).

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