Coal tar chemical wastewater multi-stage treatment device

Abstract

The invention relates to the technical field of wastewater or sewage multi-stage treatment, in particular to a coal tar chemical wastewater multi-stage treatment device which comprises a wastewater pre-stirring and depositing unit, a homogenizing and mixing unit is mounted on the right side of the wastewater pre-stirring and depositing unit, and a wastewater multi-stage screening and filtering unit is mounted on the right side of the homogenizing and mixing unit. The wastewater pre-stirring deposition unit and the homogeneous mixing unit share the same coaxial transmission assembly, a wastewater deep treatment unit is mounted on the right side of the wastewater multi-stage screening unit, and a multi-direction transmission assembly is mounted between the wastewater multi-stage screening unit and the wastewater deep treatment unit. And the upper end of the multidirectional transmission assembly is connected with the wastewater multistage screening unit. According to the coal tar chemical wastewater multi-stage treatment device, multiple units are driven by single power to work cooperatively, the unique transmission and flow guide structure design and the accurate treatment process are adopted, and multi-stage effective treatment of coal tar wastewater and resource recovery can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of multi-stage treatment of wastewater or sewage, in particular to a multi-stage treatment device for coal tar chemical wastewater. Background Art

[0002] Coal tar chemical wastewater is a high-concentration organic wastewater produced in the process of coal tar processing. It usually contains solid impurities such as coal tar particles, coal powder, coke powder, metal compounds and various liquid components. It is mainly produced in multiple production processes such as coking, coal gas purification, and coal tar deep processing.

[0003] Coal tar wastewater has the characteristics of complex composition, high toxicity and high difficulty in treatment. If it is discharged directly without effective treatment, it will cause serious pollution to water bodies, soil and other environments and destroy the ecological balance. Therefore, it must be treated with appropriate treatment processes to meet environmental emission standards.

[0004] At present, when treating coal tar chemical wastewater, physical treatment methods such as precipitation and flotation, chemical methods such as neutralization and oxidation-reduction methods, or biological treatment methods are generally used, and generally, a single treatment method cannot achieve good results. Although there are wastewater treatment methods that combine multiple treatment methods in the prior art, this treatment method generally requires the generated wastewater to be collected and transported to a centralized treatment plant within the chemical plant. This treatment method has the following problems: First, wastewater needs to be circulated over long distances, which requires the construction of large-scale transmission pipelines and intermediate stations. The initial construction costs are huge, and it is more suitable for large chemical plants to achieve wastewater treatment conditions with large daily flow rates.

[0005] Second, the existing method of using centralized treatment plants to treat wastewater requires the configuration of a complete set of regular cleaning machinery within the wastewater treatment area. When treating wastewater, a large number of equipment must be started and coordinated, and the overall operating cost is high, which is not suitable for use in small plants.

[0006] Third, the equipment inside large-scale wastewater treatment plants is relatively scattered, and additional large pipelines are required between each process to transfer intermediate products, which further increases the difficulty of its construction and subsequent operation and maintenance.

[0007] Based on this, it can be seen that how to design a device for centralized treatment of small-volume wastewater in coal tar wastewater treatment in small chemical plants is crucial to completing wastewater treatment at low cost.

[0008] The present invention proposes a multi-stage treatment device for coal tar chemical wastewater based on the actual problems encountered in actual wastewater treatment, so as to better solve the problems existing in the prior art. Summary of the invention

[0009] The present invention solves one of the above technical problems, and the technical solution adopted is: a multi-stage treatment device for coal tar chemical wastewater, comprising a wastewater pre-stirring and sedimentation unit, a homogenizing and stirring unit is installed on the right side of the wastewater pre-stirring and sedimentation unit, a wastewater multi-stage screening unit is installed on the right side of the homogenizing and stirring unit, the wastewater pre-stirring and sedimentation unit and the homogenizing and stirring unit share the same coaxial transmission assembly, a wastewater deep treatment unit is installed on the right side of the wastewater multi-stage screening unit, a multi-directional transmission assembly is installed between the wastewater multi-stage screening unit and the wastewater deep treatment unit, the upper end of the multi-directional transmission assembly is connected to the wastewater multi-stage screening unit, and the lower end of the multi-directional transmission assembly is connected to the wastewater deep treatment unit; and also includes a total drive unit, which is used to simultaneously drive the coaxial transmission assembly and the multi-directional transmission assembly to operate.

[0010] In any of the above schemes, it is preferred that the wastewater pre-stirring and sedimentation unit, the homogenizing and mixing unit, the wastewater multi-stage screening unit and the wastewater deep treatment unit are all fixedly mounted on a steel structure frame, and the bottom of the steel structure frame is pre-buried and fixed on the workshop floor.

[0011] In any of the above schemes, it is preferred that the coaxial transmission assembly includes a vertically arranged first blind tube shaft, the upper end of the first blind tube shaft is connected to the output end of the total drive unit, a self-priming guide channel is arranged on the upper part of the first blind tube shaft, the bottom of the self-priming guide channel is located below the wastewater liquid level inside the homogenizing chamber of the homogenizing mixing unit, a single agitator is arranged on the outer wall of the first blind tube shaft inside the homogenizing mixing unit, and a plurality of homogenizing drainage holes are arranged on the outer wall of the first blind tube shaft in the homogenizing chamber from top to bottom, each of the homogenizing drainage holes connects the self-priming guide channel with the interior of the homogenizing chamber and is used to divert the homogenized wastewater in the homogenizing chamber upward and then send it into the central cavity of the wastewater multi-stage screening unit, the upper outer wall of the first blind tube shaft is connected to the total drive unit, and the top of the first blind tube shaft is connected to a fixed transition drainage component and the two are internally connected.

[0012] In any of the above schemes, it is preferred that the wastewater pre-stirring and sedimentation unit includes a feed barrel fixed in the lower space of the steel structure frame, the lower end of the coaxial transmission assembly extends to the interior of the feed barrel and is used to stir and crush the coal tar wastewater mixture therein, a feed main pipe with a main control valve is installed at the lower front side of the feed barrel, a sedimentation tank is fixedly provided on the left side of the feed barrel, the sedimentation tank and the feed barrel are connected by a pipeline with a first pump body, an outlet connector with a mud discharge valve is installed at the outlet end of the sedimentation tank, a liquid drawing pipe is provided above the sedimentation tank, the lower end of the liquid drawing pipe extends to the interior of the sedimentation tank and is used to draw upward the supernatant of the coal tar wastewater after static sedimentation, the upper end of the liquid drawing pipe is connected to the interior of the homogenizing mixing unit, and a liquid drawing water pump is installed on the liquid drawing pipe.

[0013] In any of the above schemes, it is preferred that the homogenizing mixing unit includes a homogenizing cylinder fixedly installed in the corresponding space of the steel structure frame above the wastewater pre-mixing and sedimentation unit, the upper end of the liquid drawing tube is connected to the homogenizing chamber inside the homogenizing cylinder, and a mixing capping cover is sealed on the top of the homogenizing chamber, the upper end of the first blind tube shaft of the coaxial transmission assembly is movable and sealed to pass through the center top of the mixing capping cover, and the upper and lower ends of the first blind tube shaft of the coaxial transmission assembly are movable and sealed to pass through the center bottom of the homogenizing cylinder and then extend to the inside of the feeding chamber of the feeding cylinder.

[0014] In any of the above schemes, it is preferred that the multi-directional transmission assembly includes a second vertically arranged blind tube shaft, a self-falling guide channel with an open top is arranged on the upper part of the second blind tube shaft, the bottom of the self-priming guide channel is located in the central cavity of the wastewater multi-stage screening unit, and a plurality of material receiving guide holes are arranged on the outer wall of the second blind tube shaft, each of the material receiving guide holes connects the central cavity with the interior of the self-falling guide channel, the top of the self-falling guide channel is movably and sealingly sleeved on the outer wall of the right vertical section of the transition guide component and the two can rotate relative to the fixed axis, and a reversing transmission mechanism is fixedly connected to the bottom of the second blind tube shaft, and the output end of the reversing transmission mechanism is connected and cooperated with the wastewater deep treatment unit.

[0015] In any of the above schemes, it is preferred that the wastewater multi-stage screening unit includes a rotating drum unit fixedly connected to the inside of a tapered roller bearing at a corresponding position of the steel structure frame, a central cavity for receiving upstream wastewater is provided inside the rotating drum unit, a second blind pipe shaft of the multi-directional transmission assembly is coaxially provided inside the central cavity, the second blind pipe shaft relies on a self-falling diversion channel and each material receiving diversion hole to guide the homogenized wastewater into the central cavity, and the top and bottom of the rotating drum unit are respectively sealed and fixedly connected to the outer side wall of the second blind pipe shaft Then, when the second blind pipe shaft rotates, it synchronously drives the rotating drum unit to rotate at a high speed. The rotating drum unit can rely on centrifugal force to complete the separation and screening of solid and liquid in the internal wastewater. A coarse slag discharge pipe, a fine slag discharge pipe, and a water-liquid discharge pipe with a control valve are fixedly arranged at the bottom of the rotating drum unit, respectively. The interior of the coarse slag discharge pipe is connected to the interior of the central cavity, the interior of the fine slag discharge pipe is communicated with the interior of the inner annular cavity located outside the central cavity, and the interior of the water-liquid discharge pipe is communicated with the interior of the outer annular cavity located outside the inner annular cavity.

[0016] In any of the above schemes, it is preferred that the reversing transmission mechanism includes a reversing input vertical shaft vertically and coaxially fixed to the bottom of the second blind tube shaft, a bevel gear box fixed to the lower part of the steel structure frame is arranged below the reversing input vertical shaft, a first bevel gear is installed on the upper part of the bevel gear cavity of the bevel gear box, a second bevel gear is meshed on one side of the first bevel gear, the top of the first bevel gear is fixedly connected to the bottom of the reversing input vertical shaft that is movable and sealed and extends into the bevel gear cavity, the right side center of the second bevel gear is fixedly connected to the left end of the reversing output flat shaft that is movable and sealed and extends into the bevel gear cavity, the right end of the reversing output flat shaft is connected to the one-way air flotation mechanism at the bottom of the wastewater deep treatment unit, and the one-way air flotation mechanism is used to periodically supply oxygen to the inside of the dosing cavity of the wastewater deep treatment unit.

[0017] In any of the above schemes, it is preferred that the wastewater deep treatment unit includes a dosing tank fixedly installed in the middle space of the steel structure frame, a dosing tank cover is installed on the top of the dosing tank, a drug dosing pipe with a valve, a liquid feed pipe and a microorganism dosing pipe are installed at intervals on the top of the dosing tank cover, and the one-way air flotation mechanism is installed at the bottom of the dosing tank, and the lower end of the one-way air flotation mechanism is movably hinged on the outer side wall of the reversing output horizontal shaft. When the reversing output horizontal shaft rotates, it drives the one-way air flotation mechanism to continuously supply air to the interior of the dosing tank and drives the liquid inside it to roll.

[0018] In any of the above schemes, it is preferred that the total drive unit includes a positioning frame fixedly mounted on the steel structure frame, a high-torque drive motor is installed inside the positioning frame, a drive gear is fixedly mounted on the output end of the drive motor, a first gear and a second gear are spaced apart on the left side of the drive gear, the first gear is meshed with the second gear, and the second gear is meshed with the drive gear, the first gear is coaxially fixedly connected to the upper outer wall of the first blind tube shaft, and the second gear is fixedly connected to the upper outer wall of the second blind tube shaft.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This patented coal tar chemical wastewater multi-stage treatment device achieves an overall effect of high efficiency and energy saving, compact structure, good treatment effect, easy maintenance and environmental protection through innovations such as single-power drive and multiple units working in coordination, unique transmission and diversion structure design, precise treatment process and resource recycling. It can effectively treat coal tar wastewater and recycle resources.

[0020] 1. Single power drives multiple processes to improve energy efficiency: A single drive unit is used to achieve multi-directional output, and a set of power systems drives multiple key units to operate using coaxial transmission assemblies and multi-directional transmission assemblies. Compared with traditional wastewater treatment equipment where each unit requires an independent power device, it not only reduces equipment costs, but also reduces energy waste, greatly improving energy efficiency.

[0021] 2. Compact structure, easy to install and maintain: single power drives multiple processes, simplifies the overall equipment structure, reduces a large number of power connection components, control lines and additional power equipment space, and makes the equipment occupy a smaller area. Each unit is fixedly installed on the steel structure frame, and the bottom of the steel structure frame is pre-buried and fixed on the workshop floor to provide positioning points for the installation of each unit, improve the utilization rate of the workshop space, shorten the length of the pipeline connection between each unit, reduce pipeline resistance and material transportation time, reduce energy consumption, and improve wastewater treatment efficiency. At the same time, it is convenient for operators to inspect and maintain equipment, and improve operation and maintenance efficiency.

[0022] 3. Precise homogenization and mixing to optimize treatment effect: In the homogenization mixing unit, the first blind pipe axis rotates on a fixed axis to mix and finely cut the wastewater supernatant, so that the various components in the wastewater are further evenly dispersed, the homogenization degree of the wastewater is improved, a good foundation is laid for subsequent treatment links, and it helps to improve the overall wastewater treatment effect.

[0023] 4. Efficient multi-stage screening and precise solid-liquid separation: The rotating cylinder unit of the wastewater multi-stage screening unit rotates at high speed under the drive of the second blind pipe shaft, and uses centrifugal force to achieve solid-liquid separation and screening. The internal structure is equipped with a three-layer structure of a central cavity, an inner ring cavity and an outer ring cavity, which correspond to the collection areas of coarse slag, fine slag and water respectively. Compared with traditional gravity sedimentation, it can more accurately separate according to the differences in the physical properties of the materials, greatly improving the screening accuracy. By controlling the opening degree and time of the control valve of each discharge pipe, the separation effect of each layer of materials can be optimized, ensuring that the wastewater multi-stage screening unit always maintains a high screening accuracy and provides high-quality water inlet for subsequent processing links.

[0024] 5. Good deep treatment effect and strong environmental protection: The wastewater deep treatment unit uses the synergistic effect of dosing, flotation mixing and microbial flora to treat wastewater. Demulsifiers, flocculants and coagulants are added, and the dosage is controlled by a precise metering pump to cause pollutants to condense into flocs for easy separation; flotation treatment forms tiny bubbles to reduce the COD and turbidity of wastewater; aerobic microbial flora decomposes difficult-to-degrade organic matter and reduces the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of wastewater. Compared with anaerobic treatment and other processes, aerobic microbial treatment produces relatively less residual sludge and does not produce a large amount of odorous gas, which has less impact on the surrounding environment, is more environmentally friendly, and is more suitable for completing wastewater treatment in small and medium-sized workshops. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0026] Figure 1 It is a schematic diagram of the main structure of the multi-stage treatment device for coal tar chemical wastewater of the present invention.

[0027] Figure 2 It is a three-dimensional structural schematic diagram of the multi-stage treatment device for coal tar chemical wastewater of the present invention.

[0028] Figure 3 This is a schematic diagram of the partial structure of the multi-stage treatment device for coal tar chemical wastewater of the present invention after removing the steel structure frame.

[0029] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure.

[0030] Figure 5 It is a schematic diagram of the partial internal cross-sectional structure of the present invention.

[0031] Figure 6It is a schematic diagram of the partial cross-sectional structure of the second blind tube shaft of the present invention.

[0032] Figure 7 It is a schematic diagram of the partial internal cross-sectional structure of the rotating drum unit of the present invention in a three-dimensional state.

[0033] In the figure, 1. wastewater pre-mixing and sedimentation unit; 2. homogenizing and mixing unit; 3. wastewater multi-stage screening unit; 4. wastewater deep treatment unit; 5. coaxial transmission assembly; 6. multi-directional transmission assembly; 7. total drive unit; 8. steel structure frame; 9. first blind pipe shaft; 10. self-priming guide channel; 11. single agitator; 12. homogenizing drainage hole; 13. transition drainage component; 14. transition guide pipe; 15. intermediate drainage pump; 16. feed barrel; 17. master control valve ;18. Feed main pipe;19. Sedimentation tank;20. First pump body;21. Mud discharge valve;22. Outlet joint;23. Liquid drawing pipe;24. Liquid drawing water pump;25. Homogenizing cylinder;26. Mixing capping cover;27. Crushing component;28. Impeller;29. Crushing and stirring tool;30. Second blind pipe shaft;31. Self-falling diversion channel;32. Material receiving diversion hole;33. Reversing transmission mechanism;34. Rotating cylinder unit;3401. Central rigid screen cylinder; 3402, upper cover; 3403, elastic screen drum; 3404, outer drum; 3405, arc-shaped connecting seat; 3406, radial telescopic cylinder; 3407, lower cover; 35, central cavity; 36, coarse slag discharge pipe; 37, fine slag discharge pipe; 38, water liquid discharge pipe; 39, inner ring cavity; 40, outer ring cavity; 41, receiving bin; 42, screw conveyor; 43, fine slag receiving pipe bin; 44, pure liquid receiving pipe bin; 45, reversing input vertical shaft; 46, Bevel gear box; 47, first bevel gear; 48, second bevel gear; 49, reversing output flat shaft; 50, one-way flotation mechanism; 51, dosing tank; 52, tank cover; 53, drug dosing pipe; 54, liquid feed pipe; 55, microorganism dosing pipe; 56, spring-loaded one-way piston intake valve; 57, crank connecting rod; 58, positioning frame; 59, driving motor; 60, driving gear; 61, first gear; 62, second gear; 63, supporting shaft seat. DETAILED DESCRIPTION

[0034] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 7 as shown in .

[0035] Embodiment 1: A multi-stage treatment device for coal tar chemical wastewater, comprising a wastewater pre-stirring and sedimentation unit 1, a homogenizing and stirring unit 2 is installed on the right side of the wastewater pre-stirring and sedimentation unit 1, a wastewater multi-stage screening unit 3 is installed on the right side of the homogenizing and stirring unit 2, the wastewater pre-stirring and sedimentation unit 1 and the homogenizing and stirring unit 2 share the same coaxial transmission assembly 5, a wastewater deep treatment unit 4 is installed on the right side of the wastewater multi-stage screening unit 3, a multi-directional transmission assembly 6 is installed between the wastewater multi-stage screening unit 3 and the wastewater deep treatment unit 4, the upper end of the multi-directional transmission assembly 6 is connected to the wastewater multi-stage screening unit 3, and the lower end of the multi-directional transmission assembly 6 is connected to the wastewater deep treatment unit 4; it also includes a total drive unit 7, and the total drive unit 7 is used to simultaneously drive the coaxial transmission assembly 5 and the multi-directional transmission assembly 6 to operate.

[0036] The multi-stage treatment device for coal tar chemical wastewater in the present invention is mainly used in small and medium-sized coal tar chemical workshops during operation, and mainly performs multi-stage treatment including crushing, sedimentation, stirring, multi-stage screening and biochemical treatment on the coal tar wastewater generated in the coal tar chemical treatment process, so as to quickly grade and purify the wastewater containing impurities and perform subsequent biochemical treatment, and effectively realize the classification treatment and collection of wastewater substances. The overall structure of the whole device is compact and can be directly installed inside the chemical workshop to centrally treat the coal tar wastewater of small and medium-sized production, and cooperate with the solid residue filter press, drying equipment, etc. in the workshop to complete the operation of the entire wastewater treatment line.

[0037] It should be noted that the coal tar chemical wastewater multi-stage treatment device designed in the present invention can rely on a single total drive unit 7 to simultaneously achieve multi-directional output, and under the action of the coaxial transmission assembly 5 and the multi-directional transmission assembly 6, it completes the driving operation of the wastewater pre-stirring and sedimentation unit 1, the homogenizing and mixing unit 2, the wastewater multi-stage screening unit 3 and the wastewater deep treatment unit 4. A single power drives multiple processes to operate, and a single power is convenient for the inspection and determination of power failure points.

[0038] Achieving multi-directional output through a single total drive unit 7 can greatly improve energy utilization efficiency. In traditional wastewater treatment equipment, each treatment unit often requires an independent power device, which not only increases equipment costs but also causes energy waste. The device uses a coaxial transmission assembly 5 and a multi-directional transmission assembly 6 to enable a set of power systems to drive multiple key units to operate, giving full play to the power value and reducing energy consumption.

[0039] Single power drives multiple processes, significantly simplifying the overall equipment structure, making the entire structure more compact and easy to install inside the workshop. Compared with complex multi-power combination systems, it greatly reduces a large number of power connection components, control lines and additional power equipment space; the equipment occupies a smaller area, and installation and debugging are more convenient, reducing the probability of equipment failure due to too many components during operation.

[0040] A single power source is a major advantage in that it is easy to inspect and locate the power fault point. When a power problem occurs in the equipment, technicians do not need to check multiple power devices one by one, but only need to focus on the main drive unit 7 and related transmission assemblies; they can quickly locate the fault, shorten downtime, and improve production efficiency.

[0041] In any of the above schemes, it is preferred that the wastewater pre-stirring and sedimentation unit 1, the homogenizing and mixing unit 2, the wastewater multi-stage screening unit 3 and the wastewater deep treatment unit 4 are all fixedly mounted on a steel structure frame 8, and the bottom of the steel structure frame 8 is pre-buried and fixed on the workshop floor.

[0042] Each unit structure is directly installed and fixed on the entire steel structure frame 8, and the entire steel structure frame 8 is fixed on the workshop floor by pre-embedded bottom. This structural design can better provide positioning points for the installation of each unit structure, ensuring the spatial layout and compactness of the entire structure. This not only improves the space utilization rate inside the workshop, but also helps to shorten the pipe connection length between each unit, reduce pipe resistance and material transportation time, reduce energy consumption, and improve wastewater treatment efficiency. At the same time, the compact layout allows operators to walk a shorter path when inspecting and maintaining equipment, and can inspect and repair each unit more quickly, improving the operation and maintenance efficiency of the equipment.

[0043] In any of the above schemes, it is preferred that the coaxial transmission assembly 5 includes a vertically arranged first blind tube shaft 9, the upper end of the first blind tube shaft 9 is connected to the output end of the total drive unit 7, a self-priming guide channel 10 is arranged on the upper part of the first blind tube shaft 9, the bottom of the self-priming guide channel 10 is located below the wastewater liquid level inside the homogenizing chamber of the homogenizing mixing unit 2, and a single agitator 11 is arranged on the outer side wall of the first blind tube shaft 9 inside the homogenizing mixing unit 2, and a single agitator 11 is arranged in the homogenizing chamber. A plurality of homogenization drainage holes 12 are arranged on the outer wall of the first blind tube shaft 9 from top to bottom, and each of the homogenization drainage holes 12 connects the self-priming diversion channel 10 with the interior of the homogenization chamber and is used to divert the homogenized wastewater in the homogenization chamber upward and then send it into the central cavity 35 of the wastewater multi-stage screening unit 3. The upper outer wall of the first blind tube shaft 9 is connected to the total drive unit 7, and the top of the first blind tube shaft 9 is connected to a fixed transition drainage component 13 and the two are internally connected.

[0044] It should be noted that: the coaxial transmission assembly 5 can serve as a power transmission component to receive and transmit the power of the total drive unit 7 to the wastewater pre-stirring and sedimentation unit 1 and the homogenizing and mixing unit 2, and then drive the two to synchronously complete the stirring, crushing and homogenizing mixing of the wastewater; the supernatant of the wastewater after stirring, crushing and static sedimentation will be transported to the inside of the homogenizing chamber, and the single agitator 11 on the first blind tube shaft 9 in a fixed-axis rotation state can evenly or finely cut the supernatant wastewater. After the treatment is completed, the wastewater inside the homogenizing chamber remains in a homogenous state and relies on the transition drainage component 13 to complete the upward lifting and transportation and is transported to the inside of the wastewater multi-stage screening unit 3 through the transition drainage component 13 and the multi-directional transmission assembly 6 to wait for the completion of the multi-stage screening treatment.

[0045] In the homogenizing mixing unit 2, the first blind pipe shaft 9 stirs and finely cuts the wastewater supernatant transported to the homogenizing chamber through fixed-axis rotation. This process further evenly disperses the various components in the wastewater, improves the homogeneity of the wastewater, lays a good foundation for subsequent processing links, and helps to improve the overall wastewater treatment effect.

[0046] Among them, the bottom of the left vertical section of the transition guide pipe 14 in the transition drainage component 13 is movable and sealed to extend into the self-priming guide channel 10 of the first blind pipe shaft 9. When the first blind pipe shaft 9 rotates around its outer fixed axis, the connection part is ensured to be sealed. This design is like a rotary sealing joint, which not only ensures the rotation flexibility of the shaft, but also prevents wastewater leakage, maintains the airtightness of the system, and ensures the stability and safety of the wastewater during transmission.

[0047] In any of the above schemes, it is preferred that the transition guide component 13 includes a transition guide pipe 14 fixedly mounted on the steel structure frame 8, the bottom of the left vertical section of the transition guide pipe 14 is movable and sealed to extend to the interior of the self-priming guide channel 10 of the first blind pipe shaft 9, the first blind pipe shaft 9 rotates around the outer fixed axis of the left vertical section of the transition guide pipe 14 in a working state, and the connection between the two remains sealed, the bottom of the right vertical section of the transition guide pipe 14 is plugged into the top inlet end of the multi-directional transmission assembly 6, and the two are internally connected, and an intermediate drainage pump 15 is installed in the middle of the transition guide pipe 14.

[0048] In any of the above schemes, it is preferred that when the transition drainage component 13 is working, it is started by the intermediate drainage pump 15 and the wastewater mixture in a homogenous stirring state is continuously drawn upward through the self-priming diversion channel 10 of the first blind pipe shaft 9 and each homogenizing drainage hole 12, and enters the interior of the multi-directional transmission assembly 6 below the right vertical section of the transition guide pipe 14 after passing through the transition guide pipe 14, and is transported to the central cavity 35 of the wastewater multi-stage screening unit 3 after passing through the multi-directional transmission assembly 6. During the entire wastewater transportation process, the coaxial transmission assembly 5 and the multi-directional transmission assembly 6 are used as transmission parts and as waste liquid diversion parts to ensure efficient treatment and efficient guided transportation of wastewater.

[0049] In addition, it should be noted that: during the rotation of the first blind pipe shaft 9, these homogenization drainage holes 12 guide the wastewater in a homogenized state upward. The principle is similar to the siphon phenomenon. The pressure difference generated by the shaft rotation is used to guide the wastewater at the bottom of the homogenization chamber upward in an orderly manner and transport it to the center cavity 35 of the wastewater multi-stage screening unit 3, so as to achieve efficient flow of wastewater between different treatment units. This siphon suction drainage combined with the additional power of the intermediate drainage pump 15 can ensure the efficiency of drainage. At the same time, it can also reduce the power requirements for the intermediate drainage pump 15, making it easier to select a low-cost intermediate drainage pump 15, thereby achieving the purpose of cost saving.

[0050] The coaxial transmission assembly 5 and the transitional drainage component 13 work together to not only realize the efficient transmission of power, but also closely combine the treatment links of wastewater mixing, homogenization, diversion and transportation. Driven by the drive unit of a single power source, each treatment process is carried out in an orderly manner, which greatly improves the wastewater treatment efficiency, reduces the equipment footprint and energy consumption, and reduces the overall operating cost.

[0051] The sealing connection design of the self-priming guide channel 10 of the first blind pipe shaft 9 and the transition guide pipe 14, and the wastewater transportation method combining shaft rotation with pump assistance ensure the stability and accuracy of wastewater during treatment and transmission. It avoids fluctuations in treatment effects caused by leakage, insufficient power or poor transmission, ensures that the entire wastewater treatment process can operate stably for a long time, and provides reliable guarantee for meeting discharge standards.

[0052] The coaxial transmission assembly 5 and the multi-directional transmission assembly 6 not only transmit power, but also have the function of diverting waste liquid, thus realizing the multifunctional integration of the equipment. This structure greatly simplifies the overall structure volume of the entire device, reduces the number of components, reduces the equipment failure points, improves the reliability and maintainability of the equipment, and provides an efficient, stable and easy-to-manage solution for coal tar wastewater treatment.

[0053] In any of the above schemes, it is preferred that the wastewater pre-stirring and sedimentation unit 1 includes a feed barrel 16 fixed in the lower space of the steel structure frame 8, the lower end of the coaxial transmission assembly 5 extends into the interior of the feed barrel 16 and is used to stir and crush the coal tar wastewater mixture therein, a feed main pipe 18 with a main control valve 17 is installed at the lower front side of the feed barrel 16, a sedimentation tank 19 is fixedly provided on the left side of the feed barrel 16, the sedimentation tank 19 is connected to the feed barrel 16 by a pipeline with a first pump body 20, an outlet connector 22 with a mud discharge valve 21 is installed at the outlet end of the sedimentation tank 19, a liquid drawing pipe 23 is arranged above the sedimentation tank 19, the lower end of the liquid drawing pipe 23 extends into the interior of the sedimentation tank 19 and is used to draw upward the supernatant of the coal tar wastewater after static sedimentation, the upper end of the liquid drawing pipe 23 is connected to the interior of the homogenizing and stirring unit 2, and a liquid drawing water pump 24 is installed on the liquid drawing pipe 23.

[0054] When the various parts of the wastewater pre-stirring and sedimentation unit 1 work together, the feed barrel 16 is used as the starting link for feeding and is fixed in the lower space of the steel structure frame 8 to provide an entrance for the wastewater to enter. When pre-stirring the wastewater, the lower end of the coaxial transmission assembly 5 is extended into it to stir and crush the coal tar wastewater mixture, which can break up and disperse large particles, lumps and emulsified oil droplets, making the wastewater composition more uniform, preventing blockage, and speeding up the subsequent sedimentation and separation speed. When adjusting the flow rate, the main control valve 17 of the feed main pipe 18 can accurately control the inflow and flow rate of wastewater; according to the operating status of the treatment system and the load of subsequent units, the feed can be flexibly adjusted to maintain system stability, avoid overloading of the wastewater pre-stirring and sedimentation unit 1, and ensure the treatment effect.

[0055] The sedimentation tank 19 is set on the left side of the feed barrel 16. The mixed liquid that enters the sedimentation tank 19 after being crushed uses gravity to achieve solid-liquid separation in a static state, allowing heavy solid particles, mud residue and aggregated oil droplets to settle, reducing the load of subsequent processing units, reducing equipment wear, and improving subsequent processing effects. At the same time, the heavy mud material accumulates at the bottom for subsequent rapid discharge. By opening the mud discharge valve 21, the mud residue at the bottom of the sedimentation tank 19 can be discharged regularly to prevent excessive accumulation from affecting the sedimentation effect and equipment operation, and to maintain the effective volume of the sedimentation tank 19 for special treatment and disposal of mud residue. The liquid pump 24 cooperates with the liquid pumping pipe 23 to accurately transport the supernatant and avoid mixing with the bottom mud residue, ensuring the stability of the quality of the wastewater entering the subsequent unit, reducing equipment wear and blockage, extending the service life of the equipment, and making the subsequent processing process smoother.

[0056] In any of the above schemes, it is preferred that the homogenizing and stirring unit 2 includes a homogenizing barrel 25 fixedly installed in the corresponding space of the steel structure frame 8 above the wastewater pre-stirring and sedimentation unit 1, the upper end of the liquid drawing tube 23 is connected to the homogenizing chamber inside the homogenizing barrel 25, and a mixing capping cover 26 is sealed and installed on the top of the homogenizing chamber, the upper end of the first blind tube shaft 9 of the coaxial transmission assembly 5 is movable and sealed to pass through the center top of the mixing capping cover 26, and the upper and lower ends of the first blind tube shaft 9 of the coaxial transmission assembly 5 are movable and sealed to pass through the center bottom of the homogenizing barrel 25 and then extend to the inside of the feeding chamber of the feeding barrel 16.

[0057] The homogenizing cylinder 25 of the homogenizing and mixing unit 2 is firmly fixed in the corresponding space of the steel structure frame 8 above the wastewater pre-mixing and sedimentation unit 1. This layout makes full use of the vertical dimension of the space to build a compact and orderly structure. It not only significantly reduces the equipment footprint, but also greatly shortens the length of the liquid drawing pipe 23; the liquid drawing pipe 23 from the wastewater pre-mixing and sedimentation unit 1, its upper end is precisely connected to the homogenizing chamber inside the homogenizing cylinder 25, so that the wastewater supernatant after sedimentation can flow in quickly and efficiently, effectively reducing the energy loss and material residue risk during the transportation process, and laying the foundation for the efficient development of subsequent processing links.

[0058] In addition, in order to ensure the sealing link, the mixing capping cover 26 installed on the top of the homogenizing chamber adopts a strict sealing design. At the same time, the upper end of the first blind tube shaft 9 of the coaxial transmission assembly 5 is movable and sealed to pass through the center top of the mixing capping cover 26, and the lower end is also movable and sealed to pass through the center bottom of the homogenizing cylinder 25, and extends to the inside of the feeding chamber of the feeding cylinder 16. This all-round sealing structure not only effectively prevents external impurities from entering the homogenizing chamber to interfere with the treatment process, but also eliminates the possible overflow of wastewater during the mixing process, ensuring the homogenization effect and the sanitation of the equipment operation.

[0059] A crushing component 27 is coaxially fixedly mounted on the outer side wall of the first blind tube shaft 9 inside the feed chamber of the feed barrel 16 .

[0060] The crushing component 27 includes a pulse wheel 28 coaxially fixed on the outer wall of the first blind tube shaft 9, and a plurality of crushing and stirring knives 29 are fixedly installed on the outer wall of the first blind tube shaft 9 above the pulse wheel 28 at uniform intervals along its circumference. The bottom of the first blind tube shaft 9 is movably and sealingly supported in the support shaft seat 63 at the bottom of the feed chamber to maintain its vertical support and circumferential stable rotation.

[0061] The impeller 28 plays a key role when the shaft rotates. When rotating at high speed, it can drive the wastewater in the feed chamber to form a strong water flow circulation. This water flow provides a favorable fluid environment for the efficient operation of the crushing and stirring cutter 29, so that the wastewater can be initially mixed and homogenized and quickly stirred and crushed in the feed chamber. In addition, several crushing and stirring cutters 29 fixedly installed at uniform intervals along the circumference are fine processors for wastewater pretreatment. As the shaft rotates, these crushing and stirring cutters 29 accurately crush and cut the larger particle impurities, incompletely broken oil droplets or lumps remaining in the wastewater, and refine these substances into smaller particles or droplets, greatly increasing the specific surface area of ​​wastewater pollutants, creating more favorable conditions for subsequent further homogenization treatment in the homogenization chamber, and significantly improving the overall effect and efficiency of wastewater treatment.

[0062] In any of the above schemes, it is preferred that the multi-directional transmission assembly 6 includes a second vertically arranged blind tube shaft 30, a self-falling guide channel 31 with an open top is arranged on the upper part of the second blind tube shaft 30, the bottom of the self-priming guide channel 10 is located in the central cavity 35 of the wastewater multi-stage screening unit 3, and a plurality of material receiving guide holes 32 are arranged on the outer wall of the second blind tube shaft 30, each of the material receiving guide holes 32 connects the central cavity 35 with the interior of the self-falling guide channel 31, the top of the self-falling guide channel 31 is movably and sealingly sleeved on the outer wall of the right vertical section of the transition guide component 13, and the two are relatively fixed-axis rotatable, and a reversing transmission mechanism 33 is fixedly connected to the bottom of the second blind tube shaft 30, and the output end of the reversing transmission mechanism 33 is connected and cooperated with the wastewater deep treatment unit 4.

[0063] The multi-directional transmission assembly 6 can not only rely on the second blind pipe shaft 30 as a transmission member to transmit power, but also rely on the self-priming guide channel 10 to cooperate with the transition guide component 13 to achieve communication with the self-priming guide channel 10 of the upstream coaxial transmission assembly 5, thereby connecting the central cavity 35 with the homogenizing cavity, ensuring that the homogenized wastewater liquid inside the homogenizing cavity can be quickly diverted to the center cavity 35 for centralized screening and filtration. In addition, relying on the second blind pipe shaft 30 and the reversing transmission mechanism 33 at the bottom, power can continue to be output downstream and power can be provided to the wastewater deep treatment unit 4.

[0064] The multi-directional transmission assembly 6 uses a vertically arranged second blind pipe shaft 30 as a key component, and an open-topped self-falling guide channel 31 is provided on its upper part, so that wastewater can flow naturally under the action of gravity, thereby reducing the use of additional power equipment and lowering energy consumption.

[0065] At the same time, a plurality of material receiving and diversion holes 32 are distributed on the outer side wall of the second blind pipe shaft 30, which cleverly connect the central cavity 35 of the wastewater multi-stage screening unit 3 with the interior of the self-falling diversion channel 31, thereby constructing a channel network for the flow of wastewater.

[0066] The top of the self-falling diversion channel 31 is movable and sealingly sleeved on the outer wall of the right vertical section of the transition diversion component 13, and the two can rotate relative to the fixed axis. This connection method not only ensures the rotation flexibility of the shaft during power transmission, but also prevents wastewater leakage through sealing design, thereby ensuring the stability and sealing of the entire wastewater transmission process.

[0067] The reversing transmission mechanism 33 fixedly connected to the bottom of the second blind pipe shaft 30 is the key to realize the transmission of power to the downstream. It can transmit the power received by the second blind pipe shaft 30 to the wastewater deep treatment unit 4 in a suitable direction and form.

[0068] The second blind pipe shaft 30 serves as a transmission part and plays the role of a power hub in the entire system. It obtains power from the upstream main drive unit 7 and transmits the power to the wastewater deep treatment unit 4, closely connecting different treatment units together, so that a single power source can drive multiple treatment processes, thereby realizing efficient coordinated operation of the entire wastewater treatment system.

[0069] In this way, the use of independent power equipment is reduced, equipment costs and maintenance difficulties are reduced, and energy utilization efficiency is improved.

[0070] The multi-directional transmission assembly 6 and the upstream coaxial transmission assembly 5 are connected to each other through the self-priming guide channel 10, thereby realizing the connection between the central cavity 35 and the homogenizing cavity.

[0071] This design enables the homogenized wastewater treated by the homogenizing and mixing unit 2 to be quickly and smoothly directed to the interior of the central cavity 35 of the wastewater multi-stage screening unit 3 .

[0072] In this process, the self-falling guide channel 31 utilizes the gravity and cooperates with the auxiliary transportation of the transition guide component 13 to accelerate the flow speed of the wastewater and ensure the continuity and high efficiency of the wastewater treatment.

[0073] The multi-directional transmission assembly 6 forms a complete process of wastewater from pre-stirring and sedimentation, homogenizing and mixing, multi-stage screening to deep treatment, forming a closely connected and efficient operation.

[0074] This synergistic advantage greatly improves the overall effect of wastewater treatment and ensures that the final treated water quality can meet environmental emission standards.

[0075] In any of the above schemes, it is preferred that the wastewater multi-stage screening unit 3 includes a rotating drum unit 34 fixedly clamped inside a tapered roller bearing at a corresponding position of the steel structure frame 8, a central cavity 35 for receiving upstream wastewater is provided inside the rotating drum unit 34, a second blind tube shaft 30 of the multi-directional transmission assembly 6 is coaxially provided inside the central cavity 35, the second blind tube shaft 30 relies on a self-falling diversion channel 31 and each material receiving diversion hole 32 to divert homogenized wastewater into the central cavity 35, the top and bottom of the rotating drum unit 34 are respectively sealed and fixedly connected to the outer side wall of the second blind tube shaft 30, when When the second blind pipe shaft 30 rotates, it synchronously drives the rotating drum unit 34 to rotate at a high speed. The rotating drum unit 34 can rely on centrifugal force to complete the separation and screening of solid and liquid in the internal wastewater. A coarse slag discharge pipe 36, a fine slag discharge pipe 37, and a water-liquid discharge pipe 38 with a control valve are fixedly arranged at the bottom of the rotating drum unit 34. The interior of the coarse slag discharge pipe 36 is connected to the interior of the central cavity 35, the interior of the fine slag discharge pipe 37 is connected to the interior of the inner ring cavity 39 located outside the central cavity 35, and the interior of the water-liquid discharge pipe 38 is connected to the interior of the outer ring cavity 40 located outside the inner ring cavity 39.

[0076] The rotating drum unit 34 of the wastewater multi-stage screening unit 3 is driven by the second blind pipe shaft 30 to rotate at a high speed, and utilizes centrifugal force to achieve solid-liquid separation and screening.

[0077] Solid particles and liquids of different sizes and densities are subject to different forces in the centrifugal field.

[0078] The coarse slag with high density and large particle size is subjected to great centrifugal force and is preferentially thrown toward the inner wall of the central cavity 35; as the centrifugal force continues, the fine slag with slightly lower density and slightly smaller particle size is thrown to the inner annular cavity 39 outside the central cavity 35; and the liquid with the lowest density is gathered in the outermost outer annular cavity 40.

[0079] Compared with traditional gravity sedimentation, this centrifugal force-based classification method can more accurately separate materials based on differences in their physical properties, greatly improving screening accuracy.

[0080] The rotating drum unit 34 has a three-layer structure of a central cavity 35, an inner annular cavity 39 and an outer annular cavity 40, which correspond to the collection areas of coarse slag, fine slag and water respectively.

[0081] The rotating drum unit 34 includes a central rigid sieve drum 3401 coaxially sleeved on the outer side wall of the second blind tube shaft 30, a plurality of large-diameter sieve holes are arranged on the surface of the central rigid sieve drum 3401, an upper cover plate 3402 and a lower cover plate 3407 are respectively fixed on the top and bottom of the central rigid sieve drum 3401, the upper cover plate 3402 and the lower cover plate 3407 are coaxially fixedly connected to the outer side wall of the second blind tube shaft 30, when the second blind tube shaft 30 rotates, the central rigid sieve drum 3401 is driven to rotate synchronously, and the central rigid sieve drum 3401 and the second blind tube shaft 30 form the central cavity 35; an elastic sieve drum 3403 is sleeved on the periphery of the central rigid sieve drum 3401, the top and bottom of the elastic sieve drum 3403 are respectively abutted against the corresponding positions of the upper cover plate 3402 and the lower cover plate 3407, and the elastic sieve drum 3403 and the An annular inner ring cavity 39 is formed between the central rigid sieve cylinders 3401, an outer rotating cylinder 3404 is arranged on the periphery of the central rigid sieve cylinder 3401, an outer ring cavity 40 is formed between the outer rotating cylinder 3404 and the elastic sieve cylinder 3403, a plurality of arc-shaped connecting seats 3405 are fixedly installed at uniform intervals along the circumferential direction on the upper outer wall and the lower outer wall of the elastic sieve cylinder 3403, and radial telescopic cylinders 3406 are fixedly installed between each arc-shaped connecting seat 3405 and the inner wall of the vertical folding section of the upper cover plate 3402 and the lower cover plate 3407 corresponding to each other. Each radial telescopic cylinder 3406 is in a synchronous radial telescopic state when working. When each radial telescopic cylinder 3406 retracts synchronously to the outside, the outer diameter of the elastic sieve cylinder 3403 can be expanded. At this time, the sieve holes on the surface of the entire elastic sieve cylinder 3403 will be reduced, thereby achieving the purpose of changing its screening capacity.

[0082] Fine screening function: The elastic screen cylinder 3403 is located outside the central rigid screen cylinder 3401, and forms an annular inner ring cavity 39 with the central rigid screen cylinder 3401. After the material is initially screened by the central rigid screen cylinder 3401, it enters the inner ring cavity 39, and then passes through the elastic screen cylinder 3403 for further fine screening, achieving more accurate material separation.

[0083] Variable screening function: The elastic screen drum 3403 is elastic, and the size of the screen holes on its surface can be adjusted by the radial telescopic cylinder 3406. When each radial telescopic cylinder 3406 retracts outward synchronously, the outer diameter of the elastic screen drum 3403 can be expanded. At this time, the screen holes on the surface of the entire elastic screen drum 3403 will be reduced, thereby changing its screening capacity to meet the screening needs of materials with different particle sizes.

[0084] The elastic screen cylinder 3403 is made of polyurethane material, and a plurality of fine screen holes are arranged on its surface.

[0085] The inner diameter of the elastic screen drum 3403 should be slightly larger than the outer diameter of the central rigid screen drum 3401 to ensure that a suitable inner ring cavity 39 can be formed between the two to facilitate the flow and screening of materials. The outer diameter needs to be designed according to the inner diameter of the outer drum 3404 and the overall spatial layout of the screening equipment to ensure that a suitable outer ring cavity 40 is formed between the outer drum 3404.

[0086] The height of the elastic screen drum 3403 should match the height of the central rigid screen drum 3401, and the thickness of the upper cover plate 3402 and the lower cover plate 3407 should be taken into consideration to ensure that the top and bottom can accurately abut against the corresponding positions of the upper cover plate 3402 and the lower cover plate 3407. The initial screen hole size should be designed according to the average particle size of the screened material, and the adjustable range of the screen hole size should be taken into consideration to meet the screening requirements of materials with different particle sizes. The shape of the screen hole can be designed to be round, square, etc., and the specific shape should be selected according to the characteristics of the material and the screening requirements.

[0087] Polyurethane screen cylinders are usually made by casting, where the polyurethane raw materials are mixed and poured into a mold, and then cured at room temperature or under heating conditions. This process can produce screen cylinders with complex shapes and high precision.

[0088] The actual screening materials were used to test the screening efficiency of the elastic screen drum 3403, and the material passing rate and screening accuracy under different screen hole sizes were recorded. The relationship between the screening efficiency, screen hole size and material characteristics was analyzed, and the structure and parameters of the screen drum were optimized.

[0089] Self-cleaning: When the elastic screen drum 3403 shrinks, the entire screen drum structure will undergo elastic deformation, and this deformation will cause vibration on the surface of the screen drum. Just like when we gently shake a piece of dusty cloth, the dust will fall due to the vibration. During the shrinkage of the screen drum, the impurities accumulated on the surface are affected by this vibration, and the original relatively static equilibrium state with the surface of the screen drum is broken. The adhesion and friction force of the impurities are not enough to overcome the inertia force generated by the vibration, and thus fall off the surface of the screen drum.

[0090] When discharge is required, the rotating drum unit 34 is controlled to rotate to a suitable position and pause, and the control valves of the coarse slag discharge pipe 36, the fine slag discharge pipe 37, and the water liquid discharge pipe 38 are controlled to open to discharge the materials quickly.

[0091] In actual operation, the discharge speed and amount of each discharge pipe can be accurately controlled by controlling the opening degree and time of the material control valve.

[0092] For example, when it is found that the material discharged from the coarse slag discharge pipe 36 contains a large amount of fine slag components, the opening degree of the control valve can be appropriately reduced to extend the residence time of the coarse slag in the central cavity 35, so that it can be further separated under the action of stronger centrifugal force, thereby improving the purity of the coarse slag and thus improving the overall screening accuracy.

[0093] Similarly, by adjusting the control valves of the fine slag discharge pipe 37 and the water liquid discharge pipe 38, the separation effect of each layer of material can be optimized according to actual processing needs, ensuring that the wastewater multi-stage screening unit 3 always maintains a high screening accuracy and provides high-quality water for subsequent processing links.

[0094] The coarse slag discharge pipe 36 is connected to the central cavity 35, and mainly discharges solid particles with larger particle size and higher density, and can effectively intercept impurities such as large pieces of coal slag, coke powder, etc. that may exist in coal tar wastewater.

[0095] Example 2: Compared with Example 1, this example is different in that it also includes the following technical features: the slag discharged from the coarse slag discharge pipe 36 falls directly into the receiving bin 41 directly below it, and the bottom of the receiving bin 41 is above the feed port of a screw conveyor 42 fixedly installed in the lower space of the steel structure frame 8. After receiving the solid slag waste, the screw conveyor 42 continues to transport it downstream to the downstream filter press and other filtering equipment to complete continued dehydration and filtration.

[0096] The fine slag discharge pipe 37 is connected to the inner annular cavity 39 and can collect fine slag with relatively small particle size after preliminary separation, such as fine coal powder particles, colloidal impurities, etc.

[0097] When discharging, the fine slag discharge pipe 37 directly drops the fine slag into the fine slag receiving pipe bin 43 directly below it. The fine slag receiving pipe bin 43 is connected to the downstream fine slag processing station through a pipeline and reused.

[0098] The water liquid discharge pipe 38 is located at the outermost outer ring cavity 40, and only allows the relatively pure liquid after double screening to flow out.

[0099] Through this multi-layer structure design, materials with different particle sizes and density ranges can be screened layer by layer, which further improves the screening accuracy, ensures that the materials discharged from each discharge pipe are relatively pure, reduces cross-contamination between different components, and improves the refinement of wastewater treatment.

[0100] The relatively clean waste liquid discharged from the water liquid discharge pipe 38 will directly fall into the pure liquid receiving pipe bin 44 directly below it. The pure liquid receiving pipe bin 44 will transport the relatively clean waste liquid accumulated inside to the wastewater deep treatment unit 4 for collection and further microbial treatment and chemical dosing treatment through a connected pumping pipeline.

[0101] In any of the above schemes, it is preferred that the reversing transmission mechanism 33 includes a reversing input vertical shaft 45 vertically and coaxially fixed to the bottom of the second blind tube shaft 30, a bevel gear box 46 fixed to the lower part of the steel structure frame 8 is arranged below the reversing input vertical shaft 45, a first bevel gear 47 is installed on the upper part of the bevel gear cavity of the bevel gear box 46, a second bevel gear 48 is meshed on one side of the first bevel gear 47, the top of the first bevel gear 47 is fixedly connected to the bottom of the reversing input vertical shaft 45 that is movable and sealed to extend into the bevel gear cavity, the right center of the second bevel gear 48 is fixedly connected to the left end of the reversing output flat shaft 49 that is movable and sealed to extend into the bevel gear cavity, the right end of the reversing output flat shaft 49 is connected to the one-way air flotation mechanism 50 at the bottom of the wastewater deep treatment unit 4, and the one-way air flotation mechanism 50 is used to periodically supply oxygen to the inside of the dosing cavity of the wastewater deep treatment unit 4.

[0102] The reversing input vertical shaft 45 of the reversing transmission mechanism 33 transmits the power carried by the second blind tube shaft 30 vertically downward to the bevel gear box 46 fixed at the lower part of the steel structure frame 8 .

[0103] In the bevel gear cavity of the bevel gear box 46 , the first bevel gear 47 installed on the upper part is fixedly connected to the bottom of the reversing input vertical shaft 45 . When the second blind tube shaft 30 rotates, it drives the reversing input vertical shaft 45 to rotate synchronously, thereby driving the first bevel gear 47 to rotate.

[0104] The first bevel gear 47 cooperates with the second bevel gear 48 meshing on one side to convert the vertical rotation into the horizontal rotation, and the power is smoothly transmitted to the one-way flotation mechanism 50 at the bottom of the wastewater deep treatment unit 4 through the reversing output flat shaft 49 fixedly connected to the right center of the second bevel gear 48.

[0105] This unique bevel gear reversing design can efficiently and stably change the direction of power, ensuring that power is accurately transmitted to the one-way air flotation mechanism 50 of the wastewater deep treatment unit 4, providing reliable power support for its normal operation; under power drive, the one-way air flotation mechanism 50 undertakes the important task of periodically supplying oxygen to the dosing chamber of the wastewater deep treatment unit 4.

[0106] In the process of deep wastewater treatment, the supply of oxygen is crucial for some oxidation reactions.

[0107] For example, when using aerobic microorganisms to treat organic matter in wastewater, sufficient oxygen can provide a good living environment for the microorganisms and promote their decomposition and metabolism of pollutants.

[0108] The one-way air flotation mechanism 50 periodically supplies oxygen to the dosing chamber to accurately control the oxygen input amount and time interval, thereby ensuring that the reaction in the wastewater deep treatment unit 4 is carried out under appropriate conditions, improving the wastewater treatment effect, and enabling the wastewater after multi-stage treatment to more effectively remove pollutants and meet higher water quality discharge standards.

[0109] In any of the above schemes, it is preferred that the wastewater deep treatment unit 4 includes a dosing tank 51 fixedly installed in the middle space of the steel structure frame 8, a dosing tank cover 52 is installed on the top of the dosing tank 51, a drug dosing pipe 53 with a valve, a liquid feed pipe 54 and a microorganism dosing pipe 55 are installed at intervals on the top of the drug dosing tank cover 52, and the one-way air flotation mechanism 50 is installed at the bottom of the dosing tank 51, and the lower end of the one-way air flotation mechanism 50 is movably hinged on the outer side wall of the reversing output flat shaft 49. When the reversing output flat shaft 49 rotates, it drives the one-way air flotation mechanism 50 to continuously supply air to the interior of the dosing tank 51 and drives the liquid inside it to roll.

[0110] The dosing tank 51 of the wastewater deep treatment unit 4 is fixedly installed in the middle space of the steel structure frame 8, providing a core reaction site for the deep treatment of wastewater.

[0111] The setting of the medicine pool cover 52 prevents debris from entering the medicine pool 51, ensuring that the treatment process is not disturbed; on the other hand, the medicine dosing pipe 53, liquid feed pipe 54 and microorganism dosing pipe 55 installed at intervals on the top each have unique and critical functions.

[0112] The drug adding pipe 53 is controlled by a valve, and various treatment agents can be accurately added to the drug adding tank 51 .

[0113] For example, for heavy metal ions in wastewater, precipitants such as sulfide can be added to react with the heavy metal ions to form insoluble precipitates, thereby achieving removal.

[0114] If the chemical oxygen demand (COD) of wastewater needs to be reduced, a strong oxidant such as Fenton's reagent (a combination of hydrogen peroxide and ferrous ions) can be added to decompose organic pollutants through oxidation reactions.

[0115] Accurately controlling the amount of reagent added can not only ensure sufficient reaction, but also avoid secondary pollution caused by reagent waste or excessive addition.

[0116] The liquid inlet pipe 54 is used to introduce wastewater treated by the wastewater multi-stage screening unit 3 .

[0117] At this point, the wastewater has been free of most solid impurities, but still contains soluble pollutants and a small amount of fine particles, providing raw materials for deep treatment.

[0118] The microorganism dosing pipe 55 can add specific microorganisms into the dosing tank 51 .

[0119] These microorganisms are able to use organic matter in wastewater as a nutrient source for growth and metabolism, further decomposing and transforming pollutants.

[0120] For example, adding microorganisms with the ability to efficiently degrade phenols or polycyclic aromatic hydrocarbons can biodegrade such difficult-to-degrade organic matter remaining in coal tar wastewater, converting it into carbon dioxide, water and the microorganisms' own cellular substances, thereby reducing the pollutant concentration in the wastewater and improving the biodegradability of the wastewater.

[0121] The one-way air flotation mechanism 50 includes a plurality of spring-type one-way piston air intake valves 56 that are spaced and fixedly arranged in the horizontal direction of the dosing tank 51. The top air outlet ends of the spring-type one-way piston air intake valves 56 are connected to the interior of the dosing tank 51. The bottom of the piston rod of each of the spring-type one-way piston air intake valves 56 is connected to the outer side wall of the reversing output flat shaft 49 through a crank connecting rod 57. The top of the connecting rod of the crank connecting rod 57 is hinged to the bottom of the corresponding piston rod, and the free end of the crank of the crank connecting rod 57 is movably sleeved on the outer side wall of the reversing output flat shaft 49.

[0122] The one-way air flotation mechanism 50 is installed at the bottom of the dosing tank 51, and its lower end is connected to the outer side wall of the reversing output horizontal shaft 49 by a movable hinge.

[0123] When the reversing output flat shaft 49 rotates, it can drive the one-way air floating mechanism 50 to work.

[0124] This connection method not only ensures the effective transmission of power, but also allows the one-way air floating mechanism 50 to move flexibly within a certain range to adapt to its movement requirements during operation.

[0125] By transmitting power from the multi-directional transmission assembly 6 to the unidirectional air flotation mechanism 50 via the reversing transmission mechanism 33, a single power source is used to drive multiple links of the entire wastewater treatment process, thereby improving energy utilization efficiency and equipment integration.

[0126] The one-way air flotation mechanism 50 is composed of a plurality of spring-type one-way piston air inlet valves 56 which are fixedly arranged at intervals in the horizontal direction of the dosing tank 51 .

[0127] The top outlet ends of these spring-type one-way piston inlet valves 56 are connected to the interior of the dosing tank 51, and the bottom of the piston rod is connected to the reversing output flat shaft 49 through a crank connecting rod 57.

[0128] When the reversing output flat shaft 49 rotates, the crank of the crank connecting rod member 57 is driven to rotate around the axis.

[0129] The rotational motion of the crank is converted into up and down reciprocating motion of the piston rod through the connecting rod.

[0130] During the upward movement of the piston rod, the piston inside the spring-type one-way piston intake valve 56 overcomes the spring resistance and moves upward, and the outside air enters the spring-type one-way piston intake valve 56 under the action of the air pressure difference; when the piston rod moves downward, the piston returns to its original position under the action of the spring elastic force, and the spring-type one-way piston intake valve 56 is closed at this time to prevent the liquid in the dosing tank 51 from flowing back.

[0131] In this way, a one-way air intake function is achieved, and air is continuously supplied to the dosing tank 51 .

[0132] As the multiple spring-type one-way piston air inlet valves 56 continuously introduce air into the dosing tank 51 , the generated bubbles drive the liquid in the dosing tank 51 to roll during the rising process.

[0133] This process has multiple benefits for wastewater treatment.

[0134] On the one hand, the stirring effect of the bubbles allows the reagents, microorganisms and wastewater to be fully mixed, greatly increasing the contact opportunities between the reactants.

[0135] For the reaction between chemical agents and pollutants, it can speed up the reaction rate; for microbial degradation of organic matter, sufficient contact can enable the microorganisms to better absorb nutrients and improve degradation efficiency.

[0136] On the other hand, for some tiny suspended particles or flocs, bubbles can adhere to their surface and use buoyancy to bring them to the water surface to form scum, which is convenient for subsequent cleaning.

[0137] For example, when using flocculants to treat wastewater, the flocs formed by flocculation may be difficult to settle quickly due to their own insufficient gravity, but the flotation process can effectively separate these flocs and improve the clarity of the wastewater.

[0138] When the one-way air floating mechanism 50 fails, since it is driven by only a single power source, the technicians can quickly focus the troubleshooting on the power source and related transmission components, such as the reversing output flat shaft 49, the crank connecting rod 57, etc.

[0139] Unlike multi-power systems, which require checking multiple power units and complex circuits one by one, this greatly shortens the fault diagnosis time, reduces equipment downtime, and ensures the continuity of wastewater treatment work.

[0140] Multi-power drive is prone to unstable factors such as vibration and impact due to the differences in the operating rhythm of each power unit.

[0141] The single-power-driven one-way air flotation mechanism 50 has a smooth and orderly power transmission, and the spring-type one-way piston air inlet valve 56 has a consistent working rhythm, which reduces the wear and fatigue of the internal components of the equipment and extends the service life of the equipment. At the same time, it ensures the tumbling of the liquid and the stable air supply in the dosing tank 51, thereby improving the stability of the deep treatment effect of the wastewater.

[0142] In any of the above schemes, it is preferred that the total drive unit 7 includes a positioning frame 58 fixedly mounted on the steel structure frame 8, a high-torque drive motor 59 is installed inside the positioning frame 58, a drive gear 60 is fixedly mounted at the output end of the drive motor 59, and a first gear 61 and a second gear 62 are spaced apart on the left side of the drive gear 60, the first gear 61 is meshed with the second gear 62, and the second gear 62 is meshed with the drive gear 60, the first gear 61 is coaxially fixedly connected to the upper outer wall of the first blind tube shaft 9, and the second gear 62 is fixedly connected to the upper outer wall of the second blind tube shaft 30.

[0143] When the driving motor 59 drives the driving gear 60 to operate, the transmission force of the driving gear 60 can drive the first gear 61 and the second gear 62 to operate in sequence, thereby completing the input of single power to the coaxial transmission assembly 5 and the multi-directional transmission assembly 6, ensuring the linkage operation of the entire device.

[0144] The positioning frame 58 of the main drive unit 7 is firmly fixed on the steel structure frame 8, providing solid support for the internal components, ensuring that they can resist vibration and displacement during operation and maintain system stability.

[0145] The high-torque drive motor 59 is installed inside the positioning frame 58. This layout not only protects the drive motor 59, but also facilitates maintenance and inspection.

[0146] The driving gear 60 is directly mounted on the output end of the driving motor 59 to achieve seamless power connection and reduce energy loss.

[0147] The first gear 61 and the second gear 62 are spaced apart and arranged on the left side of the driving gear 60 , and they mesh with each other and with the driving gear 60 to construct a complex and orderly power transmission network.

[0148] This gear meshing design accurately controls the distribution and transmission direction of power, providing stable power input for subsequent processing units.

[0149] The driving motor 59 serves as a power source and outputs a strong torque.

[0150] When the driving motor 59 runs to drive the driving gear 60 to rotate, the driving gear 60 transmits power to the second gear 62 by virtue of the meshing relationship between the driving gear 60 and the second gear 62 .

[0151] At the same time, the second gear 62 transmits power to the first gear 61 meshing therewith.

[0152] The first gear 61 is coaxially fixed to the upper outer wall of the first blind tube shaft 9 , and the second gear 62 is fixed to the upper outer wall of the second blind tube shaft 30 , thereby realizing efficient transmission of the single power of the driving motor 59 to the coaxial transmission assembly 5 and the multi-directional transmission assembly 6 .

[0153] This process is as tight as a chain drive, ensuring the continuity and stability of power transmission, greatly improving energy efficiency, and avoiding the problems of power dispersion and waste in traditional multi-power source systems.

[0154] During the specific installation, an additional protection box can be configured for the main drive unit 7 to facilitate its maintenance.

[0155] In addition, through the coordinated operation of the driving gear 60 , the first gear 61 and the second gear 62 , the overall drive unit 7 successfully completes the input of the single power to the coaxial transmission assembly 5 and the multi-directional transmission assembly 6 .

[0156] After the coaxial transmission assembly 5 obtains power, it drives the first blind pipe shaft 9 to drive the wastewater pre-stirring and sedimentation unit 1 to stir and crush the wastewater mixture, and assists the homogenizing and stirring unit 2 to achieve homogenous mixing of the wastewater.

[0157] The multi-directional transmission assembly 6 is driven by power to guide the wastewater between different treatment units and provide power support for the wastewater deep treatment unit 4 .

[0158] The main drive unit 7 continuously supplies power to each processing unit to ensure the linkage operation of the entire device, so that the coal tar wastewater can efficiently complete the multi-stage treatment process under the coordinated action of each unit, and realize the purification of wastewater and the classification and collection of substances.

[0159] Specific working principle: During specific operation, the coal tar wastewater produced at the end of chemical production is directly pumped through the configured pipeline to the interior of the wastewater pre-stirring and sedimentation unit 1 to complete the primary mixing of the solid-liquid mixture. During the mixing process, the centimeter-level solid wastes such as the aggregates of equipment scaling, solid wastes and tar residue aggregates contained in the coal tar wastewater can be removed; the solid waste is crushed after primary stirring and then naturally precipitated and settled to form solid-liquid stratification. After being pumped through the downstream pipeline, the supernatant containing floating impurities or small particle impurities is pumped to the homogenizing mixing unit 2. The internal mixed liquid of the homogenizing mixing unit 2 will be continuously stirred to maintain a relatively homogeneous state and continue to be discharged to the wastewater. The multi-stage screening unit 3 is internally transported. During the processing process, the homogenization and mixing of the mixed liquid and the pumping transfer to the downstream are completed by the coaxial transmission assembly 5. The mixed liquid in the homogenized state is transported through the pipeline and enters the wastewater multi-stage screening unit 3. The wastewater multi-stage screening unit 3 in the working state can complete multi-stage centrifugal screening for the mixed liquid that intermittently enters it. During the screening process, the internal screening structure is used to achieve different levels of solid-liquid screening, and the solid-liquid is discharged in separate channels. The discharged semi-dry solid impurities will be directly sent to the screw conveyor 42 downstream, and after being transported by the screw conveyor 42, they will enter the downstream filter press and other filter equipment to complete further dehydration and filtration.

[0160] The finer solid slag discharged through the intermediate link will be discharged downward and continued to be transported downstream through the downstream conveying pipeline. Since the impurities here are relatively fine, they can be used in the field of building materials to produce asphalt concrete, prepare building bricks or as filling materials. They can also be used in the chemical field to extract chemical products, prepare activated carbon or produce carbon black, etc., thereby realizing the recycling and reuse of products.

[0161] Finally, the wastewater discharged after multi-stage screening needs to be transported to the downstream wastewater deep treatment unit 4 through an external pipeline. Considering that the composition of coal tar wastewater is complex and contains a large amount of pollutants such as phenols, polycyclic aromatic hydrocarbons, tar, etc., it is still difficult to meet the discharge standards after the above treatment. The wastewater is treated in the wastewater deep treatment unit 4 through the synergistic effect of dosing, flotation mixing and microbial flora to achieve deep purification of coal tar wastewater and ensure that the water quality meets environmental protection requirements.

[0162] The deep treatment of wastewater in the wastewater deep treatment unit 4 includes the following steps: S1, adding demulsifier to break the stable state of emulsified oil and aggregate it into larger oil droplets; adding flocculant and coagulant aid to promote the suspended solids, colloids and demulsified oil droplets in the wastewater to condense into flocs, which is beneficial for subsequent separation; the dosing process is controlled by a precise metering pump, and the dosage is adjusted in real time according to the wastewater flow and water quality; S2, under the action of the multi-directional transmission assembly 6, the interior of the wastewater deep treatment unit 4 is completed with flotation treatment, and the flotation treatment dissolves air in the water to form a large number of tiny bubbles, forming scum, which is convenient for cooperating with the external slag extraction equipment to continue to discharge the surface slag material to the outside, and can also greatly reduce the COD and turbidity of the wastewater; S3 The flotation treatment decomposes the difficult-to-degrade organic matter in the coal tar wastewater through the aerobic microbial flora placed inside the wastewater deep treatment unit 4; the aerobic microorganisms can quickly decompose most of the biodegradable organic matter in the coal tar wastewater into carbon dioxide and water under aerobic conditions, which can effectively reduce the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of the wastewater, so that the wastewater is purified; in addition, it can remove specific pollutants. Some aerobic microorganisms have good degradation capabilities for specific pollutants in coal tar wastewater, such as phenols and cyanides; for example, Pseudomonas can use phenols as a carbon source and energy source for growth metabolism, converting them into harmless substances, thereby reducing the concentration of these toxic and harmful substances in the wastewater.

[0163] It should also be noted that compared with anaerobic treatment and other processes, the amount of residual sludge generated in the aerobic microbial treatment process used in this unit is relatively small; because aerobic microorganisms can make more full use of organic matter in the metabolic process, converting it into products such as cellular substances and carbon dioxide, thereby reducing the amount of sludge generated in coal tar wastewater.

[0164] Aerobic treatment does not produce a large amount of smelly gases such as hydrogen sulfide during anaerobic treatment, and has less impact on the odor of the surrounding environment. It is beneficial to improve the air quality and environmental comfort around the treatment plant, and is more suitable for completing wastewater treatment in small and medium-sized workshops, making it more environmentally friendly.

[0165] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0166] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A multi-stage treatment device for coal tar chemical wastewater, characterized in that: The invention comprises a wastewater pre-stirring and sedimentation unit, a homogenizing and stirring unit is installed on the right side of the wastewater pre-stirring and sedimentation unit, a wastewater multi-stage screening unit is installed on the right side of the homogenizing and stirring unit, the wastewater pre-stirring and sedimentation unit and the homogenizing and stirring unit share the same coaxial transmission assembly, a wastewater deep treatment unit is installed on the right side of the wastewater multi-stage screening unit, a multi-directional transmission assembly is installed between the wastewater multi-stage screening unit and the wastewater deep treatment unit, the upper end of the multi-directional transmission assembly is connected to the wastewater multi-stage screening unit, and the lower end of the multi-directional transmission assembly is connected to the wastewater deep treatment unit; and also comprises a total drive unit, which is used to simultaneously drive the coaxial transmission assembly and the multi-directional transmission assembly to operate.

2. A multi-stage treatment device for coal tar chemical wastewater according to claim 1, characterized in that: The wastewater pre-stirring and sedimentation unit, the homogenizing and stirring unit, the wastewater multi-stage screening unit and the wastewater deep treatment unit are all fixedly installed on a steel structure frame, and the bottom of the steel structure frame is pre-buried and fixed on the workshop floor.

3. A multi-stage treatment device for coal tar chemical wastewater according to claim 2, characterized in that: The coaxial transmission assembly includes a first blind tube shaft arranged vertically, the upper end of the first blind tube shaft is connected to the output end of the total drive unit, a self-priming guide channel is arranged on the upper part of the first blind tube shaft, the bottom of the self-priming guide channel is located below the wastewater liquid level inside the homogenizing chamber of the homogenizing mixing unit, a single agitator is arranged on the outer side wall of the first blind tube shaft inside the homogenizing mixing unit, a plurality of homogenizing drainage holes are arranged on the outer side wall of the first blind tube shaft in the homogenizing chamber from top to bottom, each of the homogenizing drainage holes connects the self-priming guide channel with the interior of the homogenizing chamber and is used to divert the homogenized wastewater in the homogenizing chamber upward and then send it into the central chamber of the wastewater multi-stage screening unit, the upper outer side wall of the first blind tube shaft is connected to the total drive unit, the top of the first blind tube shaft is connected to a fixed transition drainage component and the two are internally connected.

4. A multi-stage treatment device for coal tar chemical wastewater according to claim 3, characterized in that: The wastewater pre-stirring and sedimentation unit includes a feed barrel fixed in the lower space of the steel structure frame, the lower end of the coaxial transmission assembly extends to the interior of the feed barrel and is used to stir and crush the coal tar wastewater mixture therein, a feed main pipe with a main control valve is installed at the lower front side of the feed barrel, a sedimentation tank is fixedly provided on the left side of the feed barrel, the sedimentation tank and the feed barrel are connected by a pipeline with a first pump body, an outlet connector with a mud discharge valve is installed at the outlet end of the sedimentation tank, a liquid drawing pipe is provided above the sedimentation tank, the lower end of the liquid drawing pipe extends to the interior of the sedimentation tank and is used to draw upward the supernatant of the coal tar wastewater after static sedimentation, the upper end of the liquid drawing pipe is connected to the interior of the homogenizing and stirring unit, and a liquid drawing water pump is installed on the liquid drawing pipe.

5. A multi-stage treatment device for coal tar chemical wastewater according to claim 4, characterized in that: The homogenizing and stirring unit includes a homogenizing cylinder fixedly installed in the corresponding space of the steel structure frame above the wastewater pre-stirring and sedimentation unit, the upper end of the liquid drawing tube is connected to the homogenizing chamber inside the homogenizing cylinder, and a mixing capping cover is sealed on the top of the homogenizing chamber, the upper end of the first blind tube shaft of the coaxial transmission assembly is movable and sealed to pass through the center top of the mixing capping cover, and the upper and lower ends of the first blind tube shaft of the coaxial transmission assembly are movable and sealed to pass through the center bottom of the homogenizing cylinder and then extend to the inside of the feeding chamber of the feeding cylinder.

6. A coal tar chemical wastewater multi-stage treatment device according to claim 5, characterized in that: The multi-directional transmission assembly includes a second vertically arranged blind pipe shaft, a self-falling guide channel with an open top is arranged on the upper part of the second blind pipe shaft, the bottom of the self-priming guide channel is located in the central cavity of the wastewater multi-stage screening unit, and a plurality of material receiving guide holes are arranged on the outer wall of the second blind pipe shaft, each of the material receiving guide holes connects the central cavity with the interior of the self-falling guide channel, the top of the self-falling guide channel is movably and sealingly sleeved on the outer wall of the right vertical section of the transition guide component, and the two can rotate relative to the fixed axis, and a reversing transmission mechanism is fixedly connected to the bottom of the second blind pipe shaft, and the output end of the reversing transmission mechanism is connected and matched with the wastewater deep treatment unit.

7. A multi-stage treatment device for coal tar chemical wastewater according to claim 6, characterized in that: The wastewater multi-stage screening unit includes a rotating drum unit fixedly connected to the inside of a tapered roller bearing at a corresponding position of the steel structure frame, a central cavity for receiving upstream wastewater is arranged inside the rotating drum unit, a second blind pipe shaft of the multi-directional transmission assembly is coaxially arranged inside the central cavity, the second blind pipe shaft guides homogeneous wastewater to the inside of the central cavity by means of a self-falling diversion channel and various material receiving diversion holes, the top and bottom of the rotating drum unit are respectively sealed and fixedly connected to the outer wall of the second blind pipe shaft, when the second blind pipe shaft rotates, the rotating drum unit is synchronously driven to rotate at a high speed, the rotating drum unit can rely on centrifugal force to complete the separation and screening of solid and liquid in the internal wastewater, a coarse slag discharge pipe, a fine slag discharge pipe, and a water-liquid discharge pipe with a material control valve are respectively fixedly arranged at the bottom of the rotating drum unit, the interior of the coarse slag discharge pipe is connected to the interior of the central cavity, the interior of the fine slag discharge pipe is connected to the interior of the inner ring cavity located outside the central cavity, and the interior of the water-liquid discharge pipe is connected to the interior of the outer ring cavity located outside the inner ring cavity.

8. A coal tar chemical wastewater multi-stage treatment device according to claim 7, characterized in that: The reversing transmission mechanism includes a reversing input vertical shaft which is vertically and coaxially fixed to the bottom of the second blind tube shaft; a bevel gear box fixed to the lower part of the steel structure frame is arranged below the reversing input vertical shaft; a first bevel gear is installed at the upper part of the bevel gear cavity of the bevel gear box; a second bevel gear is meshed on one side of the first bevel gear; the top of the first bevel gear is fixedly connected to the bottom of the reversing input vertical shaft which is movable and sealed and extends into the bevel gear cavity; the right side center of the second bevel gear is fixedly connected to the left end of the reversing output flat shaft which is movable and sealed and extends into the bevel gear cavity; the right end of the reversing output flat shaft is connected to the one-way air flotation mechanism at the bottom of the wastewater deep treatment unit; the one-way air flotation mechanism is used to periodically supply oxygen to the inside of the dosing cavity of the wastewater deep treatment unit.

9. A coal tar chemical wastewater multi-stage treatment device according to claim 8, characterized in that: The wastewater deep treatment unit includes a dosing tank fixedly installed in the middle space of the steel structure frame, a dosing tank cover is installed on the top of the dosing tank, a drug dosing pipe with a valve, a liquid feed pipe and a microorganism dosing pipe are installed at intervals on the top of the dosing tank cover, and the one-way air flotation mechanism is installed at the bottom of the dosing tank. The lower end of the one-way air flotation mechanism is movably hinged on the outer side wall of the reversing output horizontal shaft. When the reversing output horizontal shaft rotates, it drives the one-way air flotation mechanism to continuously supply air to the inside of the dosing tank and drives the liquid inside it to roll.

10. A coal tar chemical wastewater multi-stage treatment device according to claim 9, characterized in that: The total drive unit includes a positioning frame fixedly installed on the steel structure frame, a high-torque driving motor is installed inside the positioning frame, a driving gear is fixedly installed at the output end of the driving motor, a first gear and a second gear are arranged at intervals on the left side of the driving gear, the first gear is meshed with the second gear, and the second gear is meshed with the driving gear, the first gear is coaxially fixedly connected to the upper outer wall of the first blind tube shaft, and the second gear is fixedly connected to the upper outer wall of the second blind tube shaft.

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