Wastewater treatment device for wood pulp white card processing and working method thereof

Abstract

The invention relates to a waste water treatment device for wood pulp white card processing and a working method thereof.The waste water treatment device comprises a primary filtering device, an adjusting tank, a primary settling tank, a UASB reactor, an aeration tank, a chemical oxidation tank, an activated carbon adsorption machine, a concentration tank and a filter press; a supporting arm is installed at one ends of the two supporting cross beams, a plurality of annular bases are installed on the supporting arm, and a transmission box is installed at the other ends of the two supporting cross beams. The first filtering mechanism, the second filtering mechanism and the third filtering mechanism are arranged for graded filtering, meanwhile, the rotating speed ratio of the first filtering mechanism, the second filtering mechanism and the third filtering mechanism is increased from inside to outside, the rotating speed of the rotary drum screen is dynamically adjusted, the interception efficiency is remarkably improved, energy consumption is reduced, and the interception requirements of fibers with different lengths are met; and graded interception and fine recovery of the fibers are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wood pulp white cardboard wastewater treatment, and particularly relates to a wastewater treatment device for wood pulp white cardboard processing and its working method. Background Art

[0002] The wastewater from wood pulp white cardboard processing contains fibers, fillers, chemical additives, organic substances and a small amount of heavy metals, etc. The treatment needs to be carried out in steps to avoid environmental pollution.

[0003] When initially filtering the primary wastewater of wood pulp white cardboard, the fiber lengths in the wood pulp white cardboard are different. It is difficult to complete the classification filtration of fibers with different lengths through a fixed sieve hole and a fixed rotation speed. The fixed sieve hole results in a fiber loss rate of less than 1 mm being greater than 25%, and it is easy to cause blockage of the sieve holes during filtration. The internal circular sieve mesh of the existing initial filtration device has a fixed spacing. Under the fixed spacing, fibers greater than 5 mm are prone to rapid bridging and blockage, and the screening area of the circular sieve mesh cannot be adjusted according to the wastewater volume. Summary of the Invention

[0004] The problem solved by the present invention is to provide a wastewater treatment device for wood pulp white cardboard processing and its working method, which solves the technical problems that when initially filtering the primary wastewater of wood pulp white cardboard, the fiber lengths in the wood pulp white cardboard are different, it is difficult to complete the classification filtration of fibers with different lengths through a fixed sieve hole and a fixed rotation speed, the fixed sieve hole results in a fiber loss rate of less than 1 mm being greater than 25%, and it is easy to cause blockage of the sieve holes during filtration. The internal circular sieve mesh of the existing initial filtration device has a fixed spacing. Under the fixed spacing, fibers greater than 5 mm are prone to rapid bridging and blockage, and the screening area of the circular sieve mesh cannot be adjusted according to the wastewater volume.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A wastewater treatment device for wood pulp white cardboard processing includes an initial filtration device, an adjustment tank, a primary sedimentation tank, a UASB reactor, an aeration tank, a chemical oxidation tank, an activated carbon adsorber, a concentration tank and a filter press. The initial filtration device includes a bracket. Two support crossbeams are installed on the two brackets. One end of the two support crossbeams is installed with a support arm. A plurality of annular seats are installed on the support arm. The other end of the two support crossbeams is installed with a transmission box. A first filtration mechanism, a second filtration mechanism and a third filtration mechanism are rotatably installed between the annular seats and the transmission box. The first filtration mechanism, the second filtration mechanism and the third filtration mechanism are concentrically arranged from the inside to the outside;

[0007] An installation arm is installed on the support arm. A plurality of support rods and a sewage collection tank are installed on the installation arm. A plurality of high-pressure spray nozzles are installed on the bottom side of the support rods. A collection bin communicated with the sewage collection tank is installed on the installation arm. A sewage discharge pipe is installed on the collection bin.

[0008] Preferably, the first filtering mechanism includes two first retaining ring plates, and a plurality of first outer arc filters and first inner arc filters are equidistantly installed between the two first retaining ring plates, and the first outer arc filters and the first inner arc filters are arranged alternately. The pore sizes of the first outer arc filters and the first inner arc filters are 8 - 10 mm.

[0009] Preferably, a plurality of first hydraulic cylinders are equidistantly installed on the first retaining ring plate, and the telescopic ends of the first hydraulic cylinders are connected to the ends of the first outer arc filters and the first inner arc filters.

[0010] Preferably, the second filtering mechanism includes two second retaining ring plates, and a plurality of second outer arc filters and second inner arc filters are equidistantly installed between the two second retaining ring plates, and the second outer arc filters and the second inner arc filters are arranged alternately. The pore sizes of the second outer arc filters and the second inner arc filters are 3 - 5 mm.

[0011] Preferably, a plurality of second hydraulic cylinders are equidistantly installed on the second retaining ring plate, and the telescopic ends of the second hydraulic cylinders are connected to the ends of the second outer arc filters and the second inner arc filters.

[0012] Preferably, the third filtering mechanism includes two third retaining ring plates, and a plurality of third outer arc filters and third inner arc filters are equidistantly installed between the two third retaining ring plates, and the third outer arc filters and the third inner arc filters are arranged alternately. The pore sizes of the third outer arc filters and the third inner arc filters are 1 - 2 mm.

[0013] Preferably, a plurality of third hydraulic cylinders are equidistantly installed on the third retaining ring plate, and the telescopic ends of the third hydraulic cylinders are connected to the ends of the third outer arc filters and the third inner arc filters.

[0014] Preferably, rotary ring seats are arranged on the outer sides of the first retaining ring plate, the second retaining ring plate, and the third retaining ring plate, and the rotary ring seats are respectively connected to the annular seat and the transmission box by bearings.

[0015] Preferably, a first internal gear is arranged on the inner side of the rotary ring seat at one end of the first retaining ring plate, and the first internal gear meshes with the first rotating gear. A second internal gear is arranged on the inner side of the rotary ring seat at one end of the second retaining ring plate, and the second internal gear meshes with the second rotating gear. A third internal gear is arranged on the inner side of the rotary ring seat at one end of the third retaining ring plate, and the third internal gear meshes with the third rotating gear. A chain gear box is installed on the outer side of the transmission box. The first rotating gear, the second rotating gear, and the third rotating gear are installed with chain gears in the chain gear box through a transmission shaft, and the three chain gears are connected by a chain drive. A motor is installed on the chain gear box, and the output end of the motor is connected to one of the chain gears;

[0016] The rotation speed ratio per minute of the first filtering mechanism, the second filtering mechanism, and the third filtering mechanism is 1:2:3.

[0017] A working method of a wastewater treatment device for wood pulp white card processing, the working method comprising:

[0018] Step 1: The wastewater is subjected to three - stage filtration through a primary filtration device to remove large - particle fibers, waste chips and impurities, reduce the suspended - matter load. The wastewater enters the regulation tank and stays for 4 - 8 hours, then enters the primary sedimentation tank and settles for 1 - 2 hours to remove fine fibers and inorganic particles. The surface load is controlled at 0.8 - 1.2 m 3 / (m 2 ·h). The wastewater enters the UASB reactor, where the pH is controlled at 6.8 - 7.5, the temperature is 35 ± 2 °C, the residence time is 12 - 24 hours, the organic load is 4 - 10 kg COD / (m 3 ·d), the COD removal rate is 60 - 80%. The wastewater enters the aeration tank where the DO is maintained at 2 - 4 mg / L and the sludge concentration is 3000 - 5000 mg / L, and the COD is further reduced to 100 - 200 mg / L. The wastewater enters the chemical oxidation tank, where H 2 O 2 50 - 200 mg / L and Fe 2+ are added at a molar ratio of 1:1 - 1:5, pH = 3 - 4, and the reaction lasts for 60 - 120 minutes to degrade refractory organic substances. Finally, the wastewater enters the activated - carbon adsorption machine to filter the residual COD and chromaticity, ensuring that the effluent COD ≤ 80 mg / L and the chromaticity ≤ 50 times. The sludge from the primary sedimentation tank, UASB reactor and aeration tank enters the thickening tank and is dewatered by a filter press, and the sludge moisture content is reduced to 60 - 70%;

[0019] Step 2: When the wastewater enters the first filtration mechanism, through the operation of the motor, the chain teeth and the chain drive drive the first rotating tooth, the second rotating tooth and the third rotating tooth to rotate. At this time, the first rotating tooth meshes with the first inner tooth to drive the first filtration mechanism to rotate, the second rotating tooth meshes with the second inner tooth to drive the second filtration mechanism to rotate, and the third rotating tooth meshes with the third inner tooth to drive the third filtration mechanism to rotate. The long fibers larger than 10 mm are intercepted by the first outer - arc filter screen and the first inner - arc filter screen in the rotating first filtration mechanism, the medium fibers of 5 - 10 mm are intercepted by the second outer - arc filter screen and the second inner - arc filter screen in the rotating second filtration mechanism, and the short fibers less than 5 mm are intercepted by the third outer - arc filter screen and the third inner - arc filter screen in the rotating third filtration mechanism to achieve hierarchical interception. The first outer - arc filter screen and the first inner - arc filter screen are synchronously moved by the telescopic movement of the first hydraulic cylinder, the second outer - arc filter screen and the second inner - arc filter screen are synchronously moved by the telescopic movement of the second hydraulic cylinder, and the third outer - arc filter screen and the third inner - arc filter screen are synchronously moved by the telescopic movement of the third hydraulic cylinder, so as to adjust the interception inner diameter and the layer spacing of the first filtration mechanism, the second filtration mechanism and the third filtration mechanism.

[0020] The beneficial effects of the present invention are as follows: A first filtering mechanism, a second filtering mechanism, and a third filtering mechanism are provided for hierarchical filtering. At the same time, the rotational speed ratios of the first filtering mechanism, the second filtering mechanism, and the third filtering mechanism increase from the inside to the outside. Dynamically adjusting the rotational speed of the rotary drum screen significantly improves the interception efficiency and reduces energy consumption, matching the interception requirements of fibers of different lengths, and realizing the hierarchical interception and fine recovery of fibers.

[0021] The filter screen structure of the filtering mechanism is used in combination by an outer arc filter screen and an inner arc filter screen arranged in an interleaved manner. The outer arc filter screen and the inner arc filter screen are simultaneously moved through the operation of a hydraulic cylinder. When moving, the interception inner diameter and layer spacing of the first filtering mechanism, the second filtering mechanism, and the third filtering mechanism are adjusted to dynamically match the fiber particle size distribution, reduce the loss of fine fibers, expand the spacing to reduce the flow resistance under high load, and narrow the spacing to increase the interception rate under low load. Preventive spacing adjustment avoids fiber caking and mechanical overload. Description of the Drawings

[0022] Figure 1 It is the process flow diagram of the present invention;

[0023] Figure 2 It is the first structural schematic diagram of the primary filtering device of the present invention;

[0024] Figure 3 It is the second structural schematic diagram of the primary filtering device of the present invention;

[0025] Figure 4 It is the cross-sectional view of the primary filtering device of the present invention;

[0026] Figure 5 It is the cross-sectional view of the transmission box of the present invention;

[0027] Figure 6 It is the internal structural schematic diagram of the chain gear box of the present invention.

[0028] Legend Explanation:

[0029] 1. Bracket; 2. Support crossbeam; 3. Support arm; 4. Ring-shaped seat; 5. Transmission box; 6. First filtering mechanism; 7. Second filtering mechanism; 8. Third filtering mechanism; 9. Installation arm; 10. Support rod; 11. High-pressure nozzle; 12. Sewage collection tank; 13. Collection bin; 14. Drain pipe; 15. First retaining ring plate; 16. First outer arc filter screen; 17. First inner arc filter screen; 18. First hydraulic cylinder; 19. Second retaining ring plate; 20. Second outer arc filter screen; 21. Second inner arc filter screen; 22. Second hydraulic cylinder; 23. Third retaining ring plate; 24. Third outer arc filter screen; 25. Third inner arc filter screen; 26. Third hydraulic cylinder; 27. Rotating ring seat; 28. Chain gear box; 29. Motor; 30. First internal gear; 31. First rotating gear; 32. Second internal gear; 33. Second rotating gear; 34. Third internal gear; 35. Third rotating gear; 36. Transmission shaft; 37. Chain gear; 38. Chain. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Specific embodiments are given below.

[0032] See Figures 1 to 6 , a wastewater treatment device for wood pulp white card processing, including a primary filtration device, an adjustment tank, a primary sedimentation tank, a UASB reactor, an aeration tank, a chemical oxidation tank, an activated carbon adsorber, a thickening tank, and a filter press. The wastewater undergoes three-stage filtration through the primary filtration device to remove large particle fibers, waste chips, and impurities, reducing the suspended solid load. The wastewater enters the adjustment tank and stays for 4 to 8 hours. Then the wastewater enters the primary sedimentation tank and precipitates for 1 to 2 hours to remove fine fibers and inorganic particles. The surface load is controlled at 0.8 to 1.2 m 3 / (m 2 ·h). The wastewater enters the UASB reactor, where the pH is controlled at 6.8 to 7.5, the temperature is 35 ± 2 °C, the residence time is 12 to 24 hours, the organic load is 4 to 10 kg COD / (m 3 ·d), and the COD removal rate is 60 to 80%. The wastewater enters the aeration tank, where the DO is maintained at 2 to 4 mg / L and the sludge concentration is 3000 to 5000 mg / L, and the COD is further reduced to 100 to 200 mg / L. The wastewater enters the chemical oxidation tank, and H 2 O 2 50 to 200 mg / L and Fe 2+1:1 to 1:5 molar ratio, pH = 3 to 4, react for 60 to 120 minutes to degrade refractory organic matter. Finally, the wastewater enters the activated carbon adsorption machine to filter the residual COD and chromaticity, ensuring that the effluent COD ≤ 80 mg / L and chromaticity ≤ 50 times. Among them, the sludge from the primary sedimentation tank, UASB reactor, and aeration tank enters the thickening tank and is dehydrated by a filter press, and the sludge moisture content is reduced to 60 to 70%;

[0033] The primary filtration device includes a bracket 1. A support crossbeam 2 is installed on two brackets 1. A support arm 3 is installed at one end of the two support crossbeams 2. A number of annular seats 4 are installed on the support arm 3. A transmission box 5 is installed at the other end of the two support crossbeams 2. A first filtration mechanism 6, a second filtration mechanism 7, and a third filtration mechanism 8 are rotatably installed between the annular seat 4 and the transmission box 5. The first filtration mechanism 6, the second filtration mechanism 7, and the third filtration mechanism 8 are concentrically arranged from inside to outside;

[0034] An installation arm 9 is installed on the support arm 3. A number of support rods 10 and a sewage collection tank 12 are installed on the installation arm 9. A number of high-pressure nozzles 11 are installed on the bottom side of the support rods 10. A collection bin 13 communicating with the sewage collection tank 12 is installed on the installation arm 9. A sewage discharge pipe 14 is installed on the collection bin 13. The first filtration mechanism 6, the second filtration mechanism 7, and the third filtration mechanism 8 are cleaned by spraying water through the high-pressure nozzles 11. The fibers and wastewater washed down fall into the sewage collection tank 12 and are discharged through the collection bin 13 and the sewage discharge pipe 14.

[0035] The first filtering mechanism 6 includes two first retaining ring plates 15. A number of first outer arc filter meshes 16 and first inner arc filter meshes 17 are equidistantly installed between the two first retaining ring plates 15, and the first outer arc filter meshes 16 and the first inner arc filter meshes 17 are arranged in an alternating manner. The pore sizes of the first outer arc filter meshes 16 and the first inner arc filter meshes 17 are 8 - 10 mm. A number of first hydraulic cylinders 18 are equidistantly installed on the first retaining ring plates 15, and the telescopic ends of the first hydraulic cylinders 18 are connected to the ends of the first outer arc filter meshes 16 and the first inner arc filter meshes 17. The second filtering mechanism 7 includes two second retaining ring plates 19. A number of second outer arc filter meshes 20 and second inner arc filter meshes 21 are equidistantly installed between the two second retaining ring plates 19, and the second outer arc filter meshes 20 and the second inner arc filter meshes 21 are arranged in an alternating manner. The pore sizes of the second outer arc filter meshes 20 and the second inner arc filter meshes 21 are 3 - 5 mm. A number of second hydraulic cylinders 22 are equidistantly installed on the second retaining ring plates 19, and the telescopic ends of the second hydraulic cylinders 22 are connected to the ends of the second outer arc filter meshes 20 and the second inner arc filter meshes 21. The third filtering mechanism 8 includes two third retaining ring plates 23. A number of third outer arc filter meshes 24 and third inner arc filter meshes 25 are equidistantly installed between the two third retaining ring plates 23, and the third outer arc filter meshes 24 and the third inner arc filter meshes 25 are arranged in an alternating manner. The pore sizes of the third outer arc filter meshes 24 and the third inner arc filter meshes 25 are 1 - 2 mm. A number of third hydraulic cylinders 26 are equidistantly installed on the third retaining ring plates 23, and the telescopic ends of the third hydraulic cylinders 26 are connected to the ends of the third outer arc filter meshes 24 and the third inner arc filter meshes 25. Rotary ring seats 27 are provided on the outer sides of the first retaining ring plates 15, the second retaining ring plates 19, and the third retaining ring plates 23. The rotary ring seats 27 are respectively connected to the annular seat 4 and the transmission box 5 by bearings. A first internal gear 30 is provided inside the rotary ring seat 27 at one end of the first retaining ring plate 15, and the first internal gear 30 meshes with the first rotating gear 31. A second internal gear 32 is provided inside the rotary ring seat 27 at one end of the second retaining ring plate 19, and the second internal gear 32 meshes with the second rotating gear 33. A third internal gear 34 is provided inside the rotary ring seat 27 at one end of the third retaining ring plate 23, and the third internal gear 34 meshes with the third rotating gear 35. A chain gear box 28 is installed on the outer side of the transmission box 5. The first rotating gear 31, the second rotating gear 33, and the third rotating gear 35 are installed inside the chain gear box 28 through a transmission shaft 36 with chain gears 37, and the three chain gears 37 are connected by a chain 38. A motor 29 is installed on the chain gear box 28, and the output end of the motor 29 is connected to one of the chain gears 37. The rotation speeds per minute of the first filtering mechanism 6, the second filtering mechanism 7, and the third filtering mechanism 8 are in a ratio of 1:2:3. The rotation speed of the first filtering mechanism 6 is 3 - 5 rpm, the rotation speed of the second filtering mechanism 7 is 6 - 10 rpm, and the rotation speed of the third filtering mechanism 8 is 12 - 15 rpm. When the wastewater enters the first filtering mechanism 6, through the operation of the motor 29, the chain gears 37 and the chain 38 drive the first rotating gear 31, the second rotating gear 33, and the third rotating gear 35 to rotate. At this time, the first rotating gear 31 meshes with the first internal gear 30 to drive the first filtering mechanism 6 to rotate.The second rotating gear 33 meshes with the second internal gear 32 to drive the second filtering mechanism 7 to rotate, and the third rotating gear 35 meshes with the third internal gear 34 to drive the third filtering mechanism 8 to rotate. The long fibers larger than 10 mm are intercepted by the first outer arc filter screen 16 and the first inner arc filter screen 17 in the rotating first filtering mechanism 6. The medium fibers of 5-10 mm are intercepted by the second outer arc filter screen 20 and the second inner arc filter screen 21 in the rotating second filtering mechanism 7. The short fibers less than 5 mm are intercepted by the third outer arc filter screen 24 and the third inner arc filter screen 25 in the rotating third filtering mechanism 8, realizing graded interception. The first hydraulic cylinder 18 expands and contracts to drive the first outer arc filter screen 16 and the first inner arc filter screen 17 to move synchronously. The second hydraulic cylinder 22 expands and contracts to drive the second outer arc filter screen 20 and the second inner arc filter screen 21 to move synchronously. The third hydraulic cylinder 26 expands and contracts to drive the third outer arc filter screen 24 and the third inner arc filter screen 25 to move synchronously, thereby adjusting the interception inner diameter and the layer spacing of the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8.

[0036] The first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 are provided for graded filtration. At the same time, the rotational speed ratio of the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 increases from the inside to the outside. Dynamically adjusting the rotational speed of the rotary drum screen significantly improves the interception efficiency and reduces the energy consumption, matching the interception requirements of fibers of different lengths, and realizing the graded interception and fine recovery of fibers.

[0037] The filter screen structure of the filtering mechanism is combined by the staggered outer arc filter screen and the inner arc filter screen. The outer arc filter screen and the inner arc filter screen move simultaneously through the operation of the hydraulic cylinder. When moving, the interception inner diameter and the layer spacing of the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 are adjusted to dynamically match the fiber particle size distribution, reduce the loss of fine fibers, expand the spacing to reduce the flow resistance under high load, and narrow the spacing to improve the interception rate under low load. The preventive spacing adjustment avoids fiber caking and mechanical overload.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A wastewater treatment device for wood pulp white card processing, characterized in that: The invention comprises a primary filtration device, a regulating tank, a primary sedimentation tank, a UASB reactor, an aeration tank, a chemical oxidation tank, an activated carbon adsorption machine, a concentration tank and a filter press. The primary filtration device comprises a bracket (1), two brackets (1) are provided with support beams (2), one end of the two support beams (2) is provided with a support arm (3), a plurality of annular seats (4) are provided on the support arm (3), a transmission box (5) is provided at the other end of the two support beams (2), a first filter mechanism (6), a second filter mechanism (7) and a third filter mechanism (8) are rotatably provided between the annular seat (4) and the transmission box (5), and the first filter mechanism (6), the second filter mechanism (7) and the third filter mechanism (8) are arranged co-centrically from the inside to the outside; The support arm (3) is provided with a mounting arm (9), a plurality of support rods (10) and a sewage collecting tank (12) are mounted on the mounting arm (9), and a plurality of high-pressure nozzles (11) are mounted on the bottom side of the support rod (10), a collection bin (13) connected to the sewage collecting tank (12) is mounted on the mounting arm (9), and a sewage discharge pipe (14) is mounted on the collection bin (13).

2. A wastewater treatment device for wood pulp white card processing according to claim 1, characterized in that: The first filtering mechanism (6) comprises two first baffle plates (15), a plurality of first outer arc filters (16) and first inner arc filters (17) are installed at equal intervals between the two first baffle plates (15), and the first outer arc filters (16) and the first inner arc filters (17) are arranged alternately, and the filter holes of the first outer arc filters (16) and the first inner arc filters (17) have a size of 8-10 mm.

3. A wastewater treatment device for wood pulp white card processing according to claim 2, characterized in that: A plurality of first hydraulic cylinders (18) are installed at equal intervals on the first baffle plate (15), and the telescopic ends of the first hydraulic cylinders (18) are connected to the ends of the first outer arc filter (16) and the first inner arc filter (17).

4. A wastewater treatment device for wood pulp white card processing according to claim 3, characterized in that: The second filtering mechanism (7) comprises two second baffle plates (19), a plurality of second outer arc filters (20) and second inner arc filters (21) are installed at equal intervals between the two second baffle plates (19), and the second outer arc filters (20) and the second inner arc filters (21) are arranged alternately, and the filter holes of the second outer arc filters (20) and the second inner arc filters (21) have a size of 3-5 mm.

5. A wastewater treatment device for wood pulp white card processing according to claim 4, characterized in that: A plurality of second hydraulic cylinders (22) are installed at equal intervals on the second baffle plate (19), and the telescopic ends of the second hydraulic cylinders (22) are connected to the ends of the second outer arc filter (20) and the second inner arc filter (21).

6. A wastewater treatment device for wood pulp white card processing according to claim 5, characterized in that: The third filtering mechanism (8) comprises two third baffle plates (23), a plurality of third outer arc filters (24) and third inner arc filters (25) are installed at equal intervals between the two third baffle plates (23), and the third outer arc filters (24) and the third inner arc filters (25) are arranged alternately, and the filter holes of the third outer arc filters (24) and the third inner arc filters (25) have a size of 1-2 mm.

7. A wastewater treatment device for wood pulp white card processing according to claim 6, characterized in that: A plurality of third hydraulic cylinders (26) are installed at equal intervals on the third baffle plate (23), and the telescopic ends of the third hydraulic cylinders (26) are connected to the ends of the third outer arc filter (24) and the third inner arc filter (25).

8. A wastewater treatment device for wood pulp white card processing according to claim 7, characterized in that: The first baffle plate (15), the second baffle plate (19) and the third baffle plate (23) are all provided with a swivel seat (27) on the outside, and the swivel seat (27) is respectively connected to the annular seat (4) and the bearing of the transmission box (5).

9. A wastewater treatment device for wood pulp white card processing according to claim 8, characterized in that: A first internal tooth (30) is provided on the inner side of the swivel seat (27) at one end of the first retaining ring plate (15), and the first internal tooth (30) meshes with the first rotating tooth (31); a second internal tooth (32) is provided on the inner side of the swivel seat (27) at one end of the second retaining ring plate (19), and the second internal tooth (32) meshes with the second rotating tooth (33); a third internal tooth (34) is provided on the inner side of the swivel seat (27) at one end of the third retaining ring plate (23), and the third internal tooth (34) meshes with the second rotating tooth (33); ) is meshed with the third rotating tooth (35), a sprocket box (28) is installed on the outer side of the transmission box (5), the first rotating tooth (31), the second rotating tooth (33) and the third rotating tooth (35) are located in the sprocket box (28) through a transmission shaft (36), and a sprocket (37) is installed in the sprocket box (28), and the three sprockets (37) are connected by a chain (38) transmission, and a motor (29) is installed on the sprocket box (28), and the output end of the motor (29) is connected to one of the sprockets (37); The rotation speed ratio of the first filtering mechanism (6), the second filtering mechanism (7) and the third filtering mechanism (8) is 1:2:

3.

10. The working method of a wastewater treatment device for wood pulp white card processing according to claim 1, characterized in that: The working method includes: Step 1: The wastewater is filtered through the primary filter to remove large fiber particles, debris and impurities, reduce the suspended solids load, and enter the regulating tank for 4 to 8 hours. The wastewater enters the primary sedimentation tank for 1 to 2 hours to remove fine fibers and inorganic particles. The surface load is controlled at 0.8 to 1.2 m 3 / (m 2 ·h), the wastewater enters the UASB reactor to control the pH value at 6.8~7.5, the temperature at 35±2℃, the residence time at 12~24 hours, and the organic load at 4~10kg COD / (m 3 d), COD removal rate 60-80%, wastewater enters aeration tank DO maintained at 2-4 mg / L, sludge concentration 3000-5000 mg / L, COD further reduced to 100-200 mg / L, wastewater enters chemical oxidation tank, H2O2 50-200 mg / L and Fe 2+ 1:1~1:5 molar ratio, pH=3~4, reaction time 60~120 minutes, degradation of hard-to-decompose organic matter, finally the wastewater enters the activated carbon adsorption machine to filter the residual COD and chromaticity, ensuring that the effluent COD≤80mg / L, chromaticity≤50 times, among which the sludge from the primary sedimentation tank, UASB reactor and aeration tank enters the concentration tank, dehydrated by the filter press, and the sludge moisture content is reduced to 60~70%; Step 2: When wastewater enters the first filter mechanism (6), the motor (29) works, and the sprocket (37) and the chain (38) drive the first rotating tooth (31), the second rotating tooth (33) and the third rotating tooth (35) to rotate. At this time, the first rotating tooth (31) is meshed with the first inner tooth (30) to drive the first filter mechanism (6) to rotate, the second rotating tooth (33) is meshed with the second inner tooth (32) to drive the second filter mechanism (7) to rotate, and the third rotating tooth (35) is meshed with the third inner tooth (34) to drive the third filter mechanism (8) to rotate. The first outer arc filter screen (16) and the first inner arc filter screen (17) in the rotating first filter mechanism (6) intercept long fibers larger than 10 mm, and the second outer arc filter screen (20) in the rotating second filter mechanism (7) intercepts the long fibers. The second inner arc filter (21) intercepts medium fibers of 5-10 mm, and the third outer arc filter (24) and the third inner arc filter (25) in the rotating third filtering mechanism (8) intercept short fibers less than 5 mm, thereby achieving graded interception. The first outer arc filter (16) and the first inner arc filter (17) are driven to move synchronously by the extension and contraction of the first hydraulic cylinder (18), the second outer arc filter (20) and the second inner arc filter (21) are driven to move synchronously by the extension and contraction of the second hydraulic cylinder (22), and the third outer arc filter (24) and the third inner arc filter (25) are driven to move synchronously by the extension and contraction of the third hydraulic cylinder (26), thereby adjusting the interception inner diameter and interlayer spacing of the first filtering mechanism (6), the second filtering mechanism (7) and the third filtering mechanism (8).

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