A device for treating wastewater from N-ethylcarbazole production

Abstract

The application relates to the field of wastewater treatment, in particular to a wastewater treatment device for N-ethylcarbazole production, which comprises a pretreatment unit for homogenizing sewage in multiple time periods and filtering large impurities, two biochemical units for carrying out biochemical treatment on the pretreated sewage (the sewage is sequentially subjected to anaerobic and aerobic treatment), and a sludge suction unit for sucking sludge at the bottom of the biochemical tank, the biochemical unit comprises a biochemical tank, the sludge suction unit comprises a sludge suction pipe, a sludge suction rod and other components, so that the sludge in the lower sediment layer at the bottom of the biochemical tank is extracted, and the biological sludge with a higher activity degree in the upper layer is reserved; the application can effectively treat the wastewater produced in N-ethylcarbazole production, save biochemical cost and improve biochemical efficiency.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device for the production of N-ethylcarbazole. Background Technology

[0002] In the chemical production field, wastewater treatment is always a crucial step. N-Ethylcarbazole, as an important chemical raw material, is widely used in organic synthesis and electronic materials. Its synthesis process typically involves multiple chemical reactions, such as the reaction of carbazole with an ethylating agent under specific catalysts and conditions. Such production processes often generate complex wastewater containing unreacted raw materials, byproducts, catalyst residues, and various impurities such as organic solvents, nitrogen compounds, and aromatic compounds. If this wastewater is discharged directly without effective treatment, it will cause serious pollution to surrounding soil and water sources, disrupt the ecological balance, endanger human health, violate the principles of sustainable development, and hinder the green transformation of the chemical industry.

[0003] In chemical wastewater treatment, biological processes such as anaerobic and aerobic treatment are commonly used, involving the addition of microorganisms to degrade organic matter in the wastewater. After the biological reaction is complete, the sludge that settles at the bottom of the biological treatment tank needs to be treated. Traditional methods often use simple sludge suction pipes to remove some of the sludge, retaining a certain amount of microbial flora to maintain the continuous operation of the system.

[0004] However, during the sedimentation process, the sludge at the bottom of the biological treatment tank forms a stratified structure. The lower layer of sludge, due to less contact with organic matter and oxygen, typically has lower biological activity than the upper layer. Existing sludge suction pipe designs are relatively simple, making it difficult to selectively retain highly active sludge during suction, resulting in insufficient active microorganisms in the system. To restore treatment efficiency, additional biological sludge is often required, which not only increases operating costs but may also disrupt the existing microbial system due to excessive introduction of exogenous bacteria, affecting the stability and efficiency of subsequent biological treatment. Summary of the Invention

[0005] To reduce biochemical costs and improve biochemical efficiency, this application provides a wastewater treatment device for N-ethylcarbazole production, employing the following technical solution:

[0006] A wastewater treatment device for N-ethylcarbazole production, comprising:

[0007] A pretreatment unit for equalizing wastewater over multiple time periods and filtering out larger impurities in wastewater;

[0008] A biochemical unit for biochemical treatment of wastewater treated by the pretreatment unit, the biochemical unit comprising:

[0009] A biochemical tank, which is equipped with a water inlet, a water outlet, and a top air outlet;

[0010] The biochemical unit is provided in two parts. After the wastewater passes through the pretreatment unit, it enters one biochemical unit for anaerobic treatment and then enters the next biochemical unit for aerobic treatment.

[0011] The sludge suction unit for removing sludge from the bottom of the biochemical tank includes:

[0012] A suction pipe is coaxially rotatably connected to the bottom of the biochemical tank, with one end located inside the biochemical tank and the other end located outside the biochemical tank; a suction pump is installed on the suction pipe located outside the biochemical tank.

[0013] The suction rod is horizontally installed on the bottom wall of the biochemical tank, with one end fixed to the suction pipe. The suction rod has a cavity inside and is connected to the suction pipe. The vertical side of the suction rod has multiple suction holes that are connected to the cavity.

[0014] Furthermore, the suction unit also includes a mud-dividing plate, one side of which is fixed to the top of the suction rod, and the other end is inclined downwards. The mud-dividing plate is located on the side of the suction rod where the suction hole is opened.

[0015] Furthermore, the sludge suction unit also includes a sludge pressing plate, which is located above the sludge separating plate and fixed to the sludge suction rod. The sludge pressing plate is inclined upwards and forms a narrowed sludge passage with the sludge separating plate.

[0016] Furthermore, the sludge suction unit also includes mixing teeth, which are located on the side of the sludge suction rod away from the sludge suction hole, and are used to turbid the sludge passing through the sludge passage.

[0017] Furthermore, the distribution density of the plurality of suction holes gradually increases in the direction away from the suction pipe.

[0018] Furthermore, the biochemical unit also includes:

[0019] An aeration pipe is installed inside the biochemical tank and located above the suction rod.

[0020] A first rotating shaft is coaxially and vertically rotatably connected to the top of the biochemical tank;

[0021] Helical blades, the helical blades being coaxially fixed on the first rotating shaft;

[0022] The flow divider ring is coaxially fixed inside the biochemical tank, and the spiral blades are located inside the flow divider ring.

[0023] Furthermore, the biochemical unit also includes a temperature control tube, which is arranged in a mesh pattern inside the biochemical tank and rotates with the spiral blades.

[0024] Furthermore, the biochemical unit also includes;

[0025] A fixing rod is horizontally installed inside the biochemical tank, with one end fixed to the first rotating shaft;

[0026] A rotating roller is coaxially sleeved on the fixed rod; the rotating roller is provided with multiple strands; a friction wheel is coaxially provided at the end of the rotating roller away from the first rotating shaft;

[0027] A friction ring is coaxially fixed to the biochemical tank, and a friction wheel abuts against the friction ring.

[0028] Furthermore, it also includes a filter press unit for dewatering and filtering the sludge at the bottom of the biochemical tank, the filter press unit comprising:

[0029] support;

[0030] Two pressure barrels, each open at one end, have seepage holes extending through their peripheral walls. An annular groove is formed on the side wall of each pressure barrel along its axial direction. A filter screen is placed in the groove. The pressure barrels are coaxially and horizontally slidably connected to the support, with the openings of the two pressure barrels facing each other.

[0031] An extrusion plate is slidably connected coaxially inside each of the pressure barrels;

[0032] The grouting pipe passes through a pressure tank and an extrusion plate inside the pressure tank; the grouting pipe is equipped with a control valve.

[0033] Furthermore, the filter press unit also includes:

[0034] The sludge in the biochemical tank passes through the electrolytic cell before entering the pressure tank.

[0035] A pulsed current transmitter, which is used to emit pulsed current to the sludge in the electrolytic cell;

[0036] A heating layer is installed outside the electrolytic cell.

[0037] In summary, the beneficial technical effects of this application are as follows:

[0038] 1. A wastewater treatment device for N-ethylcarbazole production is designed, which uses a sludge suction unit to remove the bottom sediment of the sedimentation layer in the biochemical tank, while retaining the upper sedimentation layer with higher biological activity.

[0039] 2. A wastewater treatment device for N-ethylcarbazole production is designed, which stably absorbs the lower sediment layer through the cooperation of a sludge separating plate and a sludge pressing plate.

[0040] 3. A wastewater treatment device for N-ethylcarbazole production is designed, which deactivates biological sludge and destroys its colloidal structure through the combination of an electrolytic cell and a pulse current transmitter. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of a wastewater treatment device for N-ethylcarbazole production according to an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of the pretreatment unit structure of a wastewater treatment device for N-ethylcarbazole production according to an embodiment of this application;

[0043] Figure 3 This is a partial structural cross-sectional view of a wastewater treatment device for N-ethylcarbazole production according to an embodiment of this application, intended to show the interior of the biochemical tank;

[0044] Figure 4 This is a partial structural schematic diagram of a wastewater treatment device for N-ethylcarbazole production according to an embodiment of this application, intended to illustrate the sludge suction unit;

[0045] Figure 5 This is a partial structural schematic diagram of a wastewater treatment device for N-ethylcarbazole production according to an embodiment of this application, intended to illustrate the filter press unit;

[0046] Figure 6 This is a partial structural schematic diagram of a wastewater treatment device for N-ethylcarbazole production according to an embodiment of this application, intended to illustrate the filter press unit.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Pretreatment unit; 11. Mixing tank; 12. Interception plate; 13. Filter screen;

[0049] 2. Biochemical Unit; 21. Biochemical Tank; 22. Aeration Pipe; 23. First Rotating Shaft; 24. Spiral Blade; 25. Diverting Ring; 26. Temperature Control Pipe; 27. Fixing Rod; 28. Rotating Roller; 281. Wire Spinning; 282. Friction Wheel; 29. ​​Friction Ring; 3. Sludge Suction Unit; 31. Sludge Suction Pipe; 32. Sludge Suction Rod; 321. Sludge Suction Hole; 33. Sludge Dividing Plate; 34. Sludge Pressing Plate; 341. Sludge Passing Channel; 35. Mixing Tooth; 4. Filter Press Unit; 41. Support; 42. Press Tank; 421. Water Infiltration Hole; 43. Extrusion Plate; 44. Grouting Pipe; 45. Filter Screen; 46. Electrolytic Cell; 47. Pulse Current Emitter; 48. Heating Layer. Detailed Implementation

[0050] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] This application discloses a wastewater treatment device for the production of N-ethylcarbazole.

[0052] Reference Figure 1 , Figure 2 and Figure 3 A wastewater treatment device for N-ethylcarbazole production includes a pretreatment unit 1, a biochemical unit 2, a sludge suction unit 3, and a filter press unit 4. The combined wastewater from different stages of N-ethylcarbazole production first enters the pretreatment unit 1, where larger impurities and suspended solids are filtered out, and the wastewater quality and quantity are balanced across different stages to reduce the impact on subsequent units. After being treated by the pretreatment unit 1, the wastewater undergoes anaerobic and aerobic treatment in the biochemical unit 2. The sludge in the biochemical tank 21 is then suctioned out by the sludge suction unit 3 and sent to the filter press unit 4, where the biological sludge generated during the biochemical treatment is processed.

[0053] Reference Figure 1 and Figure 2 The pretreatment unit 1 includes a mixing tank 11, the bottom of which is inclined upward from the water inlet to the water outlet; the top of the mixing tank 11 is inclined with an interceptor plate 12 facing the water inlet, and the bottom of the interceptor plate 12 is provided with a filter screen 13, which abuts against the bottom of the mixing tank 11.

[0054] Thus, during the injection of integrated sewage, the interceptor plate 12 and the filter screen 13 intercept larger suspended solid impurities in the sewage on the side of the interceptor plate 12 near the water inlet, and personnel regularly collect them; solid sediment settles at the bottom of the pool, and due to the inclined design of the pool bottom, the solid sediment is mainly concentrated on the side of the water inlet; the surface water at the water outlet is pumped into the biological unit 2 for biological treatment.

[0055] Reference Figure 1 and Figure 3 The biochemical unit 2 includes a biochemical tank 21, which is equipped with a water inlet, a water outlet and a top air outlet.

[0056] After pretreatment, the wastewater enters the biological tank 21 through the inlet. After biological treatment, the water is discharged from the outlet. Gases such as methane generated during the biological process are discharged from the top outlet for recycling. Furthermore, inert gas is introduced into the biological tank 21 in advance during the anaerobic treatment process to prevent the gas generated during the anaerobic treatment process from mixing with the oxygen in the biological tank 21 and causing an explosion.

[0057] Reference Figure 1 , Figure 3 and Figure 4 After biochemical treatment, a certain amount of wastewater is discharged. Due to contact with organic matter and oxygen, the activity level of the organisms in the sludge at the bottom of the sedimentation layer is lower than that of the surface layer. Therefore, in order to clean the sludge at the bottom of the sedimentation layer and retain the upper layer of sludge with higher activity, the sludge suction unit 3 includes a suction pipe 31 and a suction rod 32. The suction pipe 31 is coaxially rotatably connected to the bottom of the biochemical tank 21, with one end located inside the biochemical tank 21 and the other end located outside the biochemical tank 21. A suction pump is installed on the suction pipe 31 located outside the biochemical tank 21. In this application, a driven gear is sleeved on the suction pipe 31, and a motor is installed at the bottom of the biochemical tank 21. A drive gear is installed on the output shaft of the motor, and the drive gear meshes with the driven gear.

[0058] The suction rod 32 is horizontally installed at the bottom wall of the biochemical tank 21. In this application, the suction rod 32 is a square rod to facilitate its fit with the bottom wall of the biochemical tank 21. One end is fixed to the suction pipe 31. The suction rod 32 has a cavity inside and is connected to the suction pipe 31. The vertical side of the suction rod 32 has multiple suction holes 321 that are connected to the cavity.

[0059] Thus, after the biochemical treatment is completed, the motor drives the suction pipe 31 to rotate through the gears. As the suction rod 32 rotates along the bottom wall of the biochemical tank 21, the suction pump starts to work. The sludge at the bottom of the sedimentation layer enters the suction rod 32 through the suction hole 321 and is then discharged from the suction pipe 31. In this way, the sludge at the bottom of the sedimentation layer is sucked out, while the upper sludge with higher biological activity is retained.

[0060] Reference Figure 4 During the rotation of the suction rod 32, some mixing occurs between the upper and lower layers of sediment in front of the direction of rotation, causing the upper sludge to be sucked in. To reduce this phenomenon, the suction unit 3 also includes a sludge separating plate 33. One side of the sludge separating plate 33 is fixed to the top of the suction rod 32, and the other end is inclined downward. The sludge separating plate 33 is located on the side of the suction rod 32 where the suction hole 321 is opened. In this application, the front end of the separating plate is set in a blade shape to achieve a better layering effect.

[0061] Thus, during the rotation of the suction rod 32, the sludge separating plate 33 first physically separates the sedimentation layer into upper and lower layers, reducing the chance of mixing between the upper and lower sides of the sedimentation layer; at the same time, by tilting downwards, the temporary storage space of the lower layer of sludge near the suction hole 321 is increased, satisfying the suction capacity of the suction hole 321.

[0062] Reference Figure 4Furthermore, in order to reduce the mixing of the upper and lower sediment layers during the rotation of the suction rod 32, the suction unit 3 also includes a mud pressing plate 34. The mud pressing plate 34 is located above the mud separating plate 33 and fixed to the suction rod 32. The mud pressing plate 34 is inclined upward and forms a narrow mud passage 341 with the mud separating plate 33.

[0063] Thus, during the rotation of the suction rod 32, the sludge pressing plate 34 and the sludge separating plate 33 cooperate to stabilize the sediment layer entering the sludge separating plate 33, allowing the upper sediment layer to pass through the sludge passage 341 and the lower sediment layer to enter below the sludge separating plate 33. At the same time, the upward tilt better accommodates sediment layers of different thicknesses entering the sludge passage 341, while increasing the speed of the upper sludge passing through the sludge passage 341. This causes the upper sediment layer to disperse and re-settle after being squeezed out of the sludge passage 341, allowing the sludge that was originally at the bottom of the upper layer to re-contact with the sewage, thereby increasing the overall biological activity.

[0064] Reference Figure 4 In order to further improve the "mixing effect" of sludge after it is squeezed out of the sludge passage 341, the sludge suction unit 3 also includes mixing teeth 35. The mixing teeth 35 are located on the side of the sludge suction rod 32 away from the sludge suction hole 321, and are used to mix the sludge passing through the sludge passage 341.

[0065] The mixing teeth 35 increase the disturbance effect on the sludge and improve the "mixing and dispersing" effect.

[0066] Reference Figure 4 Since the biochemical tank 21 is a cylindrical tank, the farther away from the center of the suction rod 32 is during rotation, the larger the area of ​​swing per unit time will be. This will cause the bottom sludge of the sedimentation layer far from the center to be unable to be sucked away in time. Therefore, the distribution density of multiple suction holes 321 gradually increases in the direction away from the suction pipe 31.

[0067] In this way, by adjusting the density distribution of the suction holes 321 on the cover, the effective area of ​​the suction holes 321 per unit length increases with the increase of the radius, thereby improving the suction effect and increasing the amount of suction per unit time at the point far from the center. At the same time, due to the inclined setting of the partition plate, the bottom sediment layer at the point far from the center enters the partition plate and is squeezed towards the partition plate at the point near the center, ensuring that each suction hole 321 has a sufficient bottom sediment layer for suction.

[0068] Reference Figure 1 and Figure 3 In order to enhance the effect of biochemical treatment, the biochemical unit 2 also includes an aeration pipe 22, a first rotating shaft 23, a spiral blade 24 and a diversion ring 25. The aeration pipe 22 is located inside the biochemical tank 21, above the suction rod 32, and is connected to the external air source. In order to improve the effect of the aeration pipe 22, the air holes of the aeration pipe 22 face the bottom of the biochemical tank 21.

[0069] The first rotating shaft 23 is coaxially and vertically rotatably connected to the top of the biochemical tank 21, with one end located outside the biochemical tank 21 and the other end located inside the biochemical tank 21. The end located outside the biochemical tank 21 is driven to rotate by a motor.

[0070] The spiral blade 24 is coaxially fixed on the first rotating shaft 23;

[0071] The diversion ring 25 is coaxially fixed inside the biochemical tank 21, and the spiral blade 24 is located inside the diversion ring 25;

[0072] Therefore, after the wastewater to be treated is added to the biological treatment tank 21, the aeration pipe 22 starts to work. In anaerobic treatment, the main function of the aeration pipe 22 is to remove oxygen from the tank; in aerobic treatment, the main function of the aeration pipe 22 is to add oxygen. At the same time, the motor drives the first rotating shaft 23 to rotate, and the first rotating shaft 23 drives the spiral blades 24 to rotate. Due to the presence of the diversion ring 25, the spiral blades 24 drive the water flow in the diversion ring 25 to the top of the diversion ring 25, and then back to the bottom of the diversion ring 25 from the gap between the diversion ring 25 and the biological treatment tank 21, increasing the flow of wastewater in the biological treatment tank 21, so that the microorganisms can better react with the substances in the wastewater. After the biological treatment is completed, the first motor stops, and the biological sludge settles.

[0073] Reference Figure 1 and Figure 3 In order to increase the activity of microorganisms in the biochemical tank 21, the biochemical unit 2 also includes a temperature control tube 26, which is arranged in a mesh in the biochemical tank 21 and rotates with the spiral blade 24.

[0074] The temperature inside the tank is improved by the temperature control tube 26, so that the microorganisms are in the most active state. The temperature control tube 26 rotates with the spiral blade 24, which can better regulate water temperature changes compared to static heating.

[0075] Reference Figure 1 and Figure 3 In order to further maintain the biological activity of the upper layer of sediment, the temperature control pipe 26 is located between the aeration pipe 22 and the suction rod 32, so that the temperature of the upper layer of sediment is prioritized during sedimentation. At the same time, in order to maintain the biological activity during the aerobic treatment process, the aeration pipe 22 releases a small amount of oxygen during sedimentation.

[0076] Reference Figure 1 and Figure 3 During the biochemical treatment process, a certain amount of foam is often generated, which affects the efficiency of biochemical reaction and operation. In order to eliminate foam, the biochemical unit 2 also includes a fixed rod 27, a rotating roller 28 and a friction ring 29. The fixed rod 27 is horizontally set inside the biochemical tank 21, and one end is fixed to the first rotating shaft 23.

[0077] The rotating roller 28 is coaxially sleeved on the fixed rod 27; the rotating roller 28 is provided with multiple strands 281; the end of the rotating roller 28 away from the first rotating shaft 23 is coaxially provided with a friction wheel 282; in order to improve the defoaming effect, the maximum water level of the sewage is lower than the lowest point where the strands 281 naturally fall.

[0078] The friction ring 29 is coaxially fixed on the biochemical tank 21, and the friction wheel 282 abuts against the friction ring 29;

[0079] In this way, during the biochemical treatment process, the first rotating shaft 23 drives the fixed rod 27 to rotate, and the rotating roller 28 rotates with the first rotating shaft 23. As the friction wheel 282 abuts against the friction ring 29, it drives the rotating roller 28 to rotate, causing the spun silk 281 to swing and break the bubbles on the surface of the sewage, thus achieving the defoaming effect.

[0080] Reference Figure 1 and Figure 5 In order to treat the sludge discharged from the biochemical tank 21, the wastewater treatment device for N-ethylcarbazole production also includes a filter press unit 4. The filter press unit 4 includes a support 41, a pressure tank 42, an extrusion plate 43, and a grouting pipe 44. The pressure tank 42 is open at one end and has two openings. A seepage hole 421 is provided through the peripheral wall of the pressure tank 42. An annular placement groove is provided at the end of the pressure tank 42 along the axial direction of the pressure tank 42 in the side wall of the pressure tank 42. A filter screen 45 is placed in the placement groove. The pressure tank 42 is coaxially and horizontally slidably connected to the support 41, and the openings of the two pressure tanks 42 are arranged opposite each other. In this application, the pressure tank 42 slides on the support 41 by a cylinder.

[0081] Each pressure barrel 42 is coaxially slidably connected to an extrusion plate 43. The extrusion plate 43 is driven to slide inside the pressure barrel 42 by a cylinder fixed on the pressure barrel 42.

[0082] The grouting pipe 44 is coaxially inserted through a pressure tank 42 and the extrusion plate 43 inside the pressure tank 42; a control valve is provided on the grouting pipe 44.

[0083] In this way, the cylinder causes the two pressure barrels 42 to abut against each other, forming a receiving cavity; the sludge in the suction pipe 31 is injected into the receiving cavity through the grouting pipe 44, and the control valve is closed after the injection is completed; then the cylinder drives the pressure plate to squeeze, squeezing the water in the sludge into the seepage hole 421, and after being filtered by the filter screen, the sludge dewatering is completed; then the two pressure barrels 42 separate, and the squeezing plate 43 pushes out the dewatered sludge cake and drops it, which is convenient for subsequent collection by personnel;

[0084] The filter screen 45 is replaced periodically by placing it in the tank.

[0085] Reference Figure 1 and Figure 6Because the sludge in the biochemical tank is biological sludge, its main components are organic matter (microbial flocs, cells, and extracellular polymeric substances (EPS)). The physical properties of this substance are: strong hydrophilicity, high compressibility (like tofu / jelly), fine particles, and high viscosity. Therefore, dewatering presents the following challenges: 1. High bound water content: a large amount of water is trapped inside the flocs and cells; 2. Compressibility: it deforms under pressure, clogging the filter cloth channels and preventing water from passing through; 3. Poor permeability: colloidal substances easily clog the filter cloth. Current treatment methods involve adding chemical agents, which is costly and causes secondary pollution. To address the difficulties in dewatering biological sludge, the filter press unit 4 also includes: an electrolytic cell 46, a pulse current transmitter 47, and a heating layer 48. The sludge in the biochemical tank 21 passes through the electrolytic cell 46 before entering the press tank 42.

[0086] The pulse current transmitter 47 is used to emit pulse current to the sludge in the electrolysis cell 46;

[0087] The heating layer 48 is installed outside the electrolytic cell 46;

[0088] Therefore, before entering the depressor 42, the biological sludge is first collected in the electrolysis cell 46 and then subjected to pulsed current from the pulsed current transmitter 47 to break down the biological colloids. By using pulsed current, the biological colloids can be broken down and the water inside can be released, which facilitates the dewatering of the sludge. On the other hand, it reduces the cost of chemical agents and reduces secondary chemical pollution. Furthermore, it kills pathogens in the wastewater, which facilitates the subsequent treatment of sludge.

[0089] The heating layer 48 can heat the sludge in the electrolytic cell 46 by burning the flammable gas produced by the anaerobic reaction, and also plays a role in breaking down the colloids.

[0090] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0091] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wastewater treatment device for N-ethylcarbazole production, characterized in that, include: A pretreatment unit (1) for equalizing wastewater over multiple time periods and filtering out larger impurities in wastewater; A biochemical unit (2) for biochemical treatment of wastewater treated by the pretreatment unit (1), the biochemical unit (2) includes: a biochemical tank (21), the biochemical tank (21) is provided with an inlet, an outlet and a top air outlet; there are two biochemical units (2), the wastewater enters one of the biochemical units (2) after passing through the pretreatment unit (1) and undergoes anaerobic treatment before entering the next biochemical unit (2) for aerobic treatment; The sludge suction unit (3) for suctioning sludge from the bottom of the biochemical tank (21) includes: A suction pipe (31) is coaxially rotatably connected to the bottom of the biochemical tank (21), with one end located inside the biochemical tank (21) and the other end located outside the biochemical tank (21); a suction pump is provided on the suction pipe (31) located outside the biochemical tank (21); A suction rod (32) is horizontally installed on the bottom wall of the biochemical tank (21), with one end fixed to the suction pipe (31). The suction rod (32) has a cavity inside and is connected to the suction pipe (31). The suction rod (32) has multiple suction holes (321) on its vertical side that are connected to the cavity. The mud separating plate (33) is fixed on one side of the suction rod (32) and the other end is inclined downward. The mud separating plate (33) is located on the side of the suction rod (32) where the suction hole (321) is opened. A mud-pressing plate (34) is located above the mud-dividing plate (33) and fixed to the suction rod (32). The mud-pressing plate (34) is inclined upward and forms a narrow mud passage (341) with the mud-dividing plate (33). Mixing teeth (35), the mixing teeth (35) are located on the side of the suction rod (32) away from the suction hole (321), and are used to mix the sludge passing through the sludge passage (341); The density of the plurality of suction holes (321) gradually increases in the direction away from the suction pipe (31).

2. The wastewater treatment device for N-ethylcarbazole production according to claim 1, characterized in that, The biochemical unit (2) also includes: Aeration pipe (22) is located inside the biochemical tank (21) and above the suction rod (32); The first rotating shaft (23) is coaxially and vertically rotatably connected to the top of the biochemical tank (21); Helical blade (24), the helical blade (24) is coaxially fixed on the first rotating shaft (23); The diversion ring (25) is coaxially fixed inside the biochemical tank (21), and the spiral blade (24) is located inside the diversion ring (25).

3. The wastewater treatment device for N-ethylcarbazole production according to claim 2, characterized in that, The biochemical unit (2) also includes a temperature control tube (26), which is arranged in a mesh inside the biochemical tank (21) and rotates with the spiral blades (24).

4. The wastewater treatment device for N-ethylcarbazole production according to claim 2, characterized in that, The biochemical unit (2) also includes: A fixing rod (27) is horizontally installed inside the biochemical tank (21), with one end fixed to the first rotating shaft (23); A rotating roller (28) is coaxially sleeved on the fixed rod (27); the rotating roller (28) is provided with multiple filaments (281); a friction wheel (282) is coaxially provided at the end of the rotating roller (28) away from the first rotating shaft (23); Friction ring (29) is coaxially fixed on the biochemical tank (21), and friction wheel (282) abuts against the friction ring (29).

5. The wastewater treatment device for N-ethylcarbazole production according to claim 1, characterized in that, It also includes a filter press unit (4) for dewatering and filtering the sludge at the bottom of the biochemical tank (21), the filter press unit (4) comprising: Scaffold (41); Two pressure barrels (42) with one open end are provided. The peripheral wall of each pressure barrel (42) is provided with a seepage hole (421). An annular placement groove is provided on the side wall of each pressure barrel (42) along the axis of the pressure barrel (42). A filter screen (45) is placed in the placement groove. The pressure barrels (42) are coaxially and horizontally slidably connected to the bracket (41), and the openings of the two pressure barrels (42) are arranged opposite to each other. An extrusion plate (43) is coaxially slidably connected inside each of the pressure barrels (42); Grouting pipe (44) is inserted through a pressure tank (42) and an extrusion plate (43) inside the pressure tank (42); a control valve is provided on the grouting pipe (44).

6. The wastewater treatment device for N-ethylcarbazole production according to claim 5, characterized in that, The filter press unit (4) further includes: The sludge in the biochemical tank (21) passes through the electrolytic cell (46) and then enters the pressure tank (42); A pulse current transmitter (47) is used to emit pulse current to the sludge in the electrolytic cell (46); A heating layer (48) is installed outside the electrolytic cell (46).

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