A device for treating wastewater from wood pulp white card processing and a working method thereof

Abstract

The present application relates to a kind of wood pulp white card processing wastewater treatment device and its working method, including initial filter device, adjusting pool, primary sedimentation tank, UASB reactor, aeration tank, chemical oxidation tank, activated carbon adsorption machine, concentration tank and filter press, the initial filter device includes support, two The support is equipped with support crossbeam, two The support crossbeam one end is equipped with support arm, the support arm is equipped with a plurality of ring type seats, two The support crossbeam other end is equipped with transmission case;First filter mechanism, second filter mechanism and third filter mechanism are provided to carry out hierarchical filtration, while first filter mechanism, second filter mechanism and third filter mechanism have inside to outside speed ratio increase, dynamic adjustment of the rotational speed of drum screen significantly improves the retention efficiency and reduces energy consumption, matches the retention needs of different length fibers, realizes the hierarchical retention and fine recovery of fiber.

Description

TECHNICAL FIELD

[0001] The present application relates to wood pulp white card wastewater treatment technical field, especially to a kind of wood pulp white card processing wastewater treatment device and its working method. BACKGROUND

[0002] Wood pulp white card processing wastewater contains fiber, filler, chemical additive, organic matter and a small amount of heavy metal, etc., and treatment needs to be carried out in steps to avoid pollution to the environment.

[0003] When the wood pulp white card preliminary wastewater is initially filtered, the fiber length in the wood pulp white card is different, and it is difficult to complete the classification filtering of fibers of different lengths by fixed screen hole and fixed rotating speed, and the fixed screen hole leads to the loss rate of fibers less than 1mm being greater than 25%, and easily causing the clogging of screen holes in the filter, the internal circular screen of the existing initial filtering device is fixed spacing, under the fixed spacing, fibers greater than 5mm are easily quickly bridged and clogged, and the screening area of the circular screen cannot be adjusted according to the wastewater volume. SUMMARY

[0004] The present application solves the problem of providing a wood pulp white card processing wastewater treatment device and its working method, which solves the technical problem that when the wood pulp white card preliminary wastewater is initially filtered, the fiber length in the wood pulp white card is different, and it is difficult to complete the classification filtering of fibers of different lengths by fixed screen hole and fixed rotating speed, and the fixed screen hole leads to the loss rate of fibers less than 1mm being greater than 25%, and easily causing the clogging of screen holes in the filter, the internal circular screen of the existing initial filtering device is fixed spacing, under the fixed spacing, fibers greater than 5mm are easily quickly bridged and clogged, and the screening area of the circular screen cannot be adjusted according to the wastewater volume.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A wood pulp white card processing wastewater treatment device, comprising an initial filtering device, an adjusting pool, an initial 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 initial filtering device comprises a support, two supports are provided with a support beam, one end of the two support beams is provided with a support arm, a plurality of ring seats are installed on the support arm, the other end of the two support beams is provided with a transmission box, the first filtering mechanism, the second filtering mechanism and the third filtering mechanism are rotatably installed between the ring seat and the transmission box, and the first filtering mechanism, the second filtering mechanism and the third filtering mechanism are coaxially arranged from inside to outside;

[0007] A mounting arm is installed on the support arm, a plurality of support rods and a sewage collecting tank are installed on the mounting arm, a plurality of high-pressure nozzles are installed on the bottom side of the support rod, a collecting bin in communication with the sewage collecting tank is installed on the mounting arm, and a sewage discharge pipe is installed on the collecting bin.

[0008] Preferably, the first filter mechanism comprises two first ring plates, a plurality of first outer arc filter screens and first inner arc filter screens are installed equidistantly between the two first ring plates, and the first outer arc filter screens and the first inner arc filter screens are arranged alternately, and the filter hole size of the first outer arc filter screens and the first inner arc filter screens is 8-10 mm.

[0009] Preferably, a plurality of first hydraulic cylinders are installed equidistantly on the first ring plate, and the first hydraulic cylinders are connected with the end portions of the first outer arc filter screens and the first inner arc filter screens.

[0010] Preferably, the second filter mechanism comprises two second ring plates, a plurality of second outer arc filter screens and second inner arc filter screens are installed equidistantly between the two second ring plates, and the second outer arc filter screens and the second inner arc filter screens are arranged alternately, and the filter hole size of the second outer arc filter screens and the second inner arc filter screens is 3-5 mm.

[0011] Preferably, a plurality of second hydraulic cylinders are installed equidistantly on the second ring plate, and the second hydraulic cylinders are connected with the end portions of the second outer arc filter screens and the second inner arc filter screens.

[0012] Preferably, the third filter mechanism comprises two third ring plates, a plurality of third outer arc filter screens and third inner arc filter screens are installed equidistantly between the two third ring plates, and the third outer arc filter screens and the third inner arc filter screens are arranged alternately, and the filter hole size of the third outer arc filter screens and the third inner arc filter screens is 1-2 mm.

[0013] Preferably, a plurality of third hydraulic cylinders are installed equidistantly on the third ring plate, and the third hydraulic cylinders are connected with the end portions of the third outer arc filter screens and the third inner arc filter screens.

[0014] Preferably, the outer sides of the first ring plate, the second ring plate and the third ring plate are provided with rotating ring seats, and the rotating ring seats are connected with the ring seats and the transmission box bearings respectively.

[0015] Preferably, a first internal gear is arranged on the inner side of the rotating ring seat at one end of the first ring plate, the first internal gear is engaged with a first rotating gear, a second internal gear is arranged on the inner side of the rotating ring seat at one end of the second ring plate, the second internal gear is engaged with a second rotating gear, a third internal gear is arranged on the inner side of the rotating ring seat at one end of the third ring plate, the third internal gear is engaged with a 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, the three chain gears are connected through a chain transmission, a motor is installed on the chain gear box, and the output end of the motor is connected with one of the chain gears.

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

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

[0018] Step one: the wastewater is subjected to three-stage filtration through a preliminary filtration device to remove large-particle fibers, debris and impurities, and reduce suspended matter load, the wastewater enters a conditioning tank and stays for 4-8 hours, the wastewater enters a primary sedimentation tank and is deposited 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 a UASB reactor, the pH is controlled at 6.8-7.5, the temperature is controlled at 35±2℃, 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 an aeration tank, the DO is maintained at 2-4 mg / L, the sludge concentration is 3000-5000 mg / L, the COD is further reduced to 100-200 mg / L, the wastewater enters a chemical oxidation tank, H2O2 is added at 50-200 mg / L and Fe 2+ 1 is added at a molar ratio of 1:1-1:5, the pH is 3-4, the reaction time is 60-120 minutes, the refractory organic matter is degraded, finally the wastewater enters an activated carbon adsorption machine to filter the residual COD and color, ensuring that the effluent COD is ≤80 mg / L and the color is ≤50 times, wherein the sludge in the primary sedimentation tank, the UASB reactor and the aeration tank enters a thickening tank, is dewatered by a filter press, and the moisture content of the sludge is reduced to 60-70%;

[0019] Step two: when the wastewater enters the first filtering mechanism, the first gear tooth and the chain drive the first gear, the second gear and the third gear to rotate through the work of the motor, at this time, the first gear meshes with the first inner tooth to drive the first filtering mechanism to rotate, the second gear meshes with the second inner tooth to drive the second filtering mechanism to rotate, and the third gear meshes with the third inner tooth to drive the third filtering mechanism to rotate, the first outer arc filter screen and the first inner arc filter screen in the rotating first filtering mechanism intercept long fibers greater than 10 mm, the second outer arc filter screen and the second inner arc filter screen in the rotating second filtering mechanism intercept medium fibers of 5-10 mm, and the third outer arc filter screen and the third inner arc filter screen in the rotating third filtering mechanism intercept short fibers less than 5 mm, thereby achieving hierarchical interception, the first outer arc filter screen and the first inner arc filter screen are synchronously moved by the extension and retraction of the first hydraulic cylinder, the second outer arc filter screen and the second inner arc filter screen are synchronously moved by the extension and retraction of the second hydraulic cylinder, and the third outer arc filter screen and the third inner arc filter screen are synchronously moved by the extension and retraction of the third hydraulic cylinder, thereby adjusting the interception inner diameter and the layer spacing of the first filtering mechanism, the second filtering mechanism and the third filtering mechanism.

[0020] The beneficial effects of the present application are: the first filtering mechanism, the second filtering mechanism and the third filtering mechanism are arranged for hierarchical filtering, the first filtering mechanism, the second filtering mechanism and the third filtering mechanism have an increasing speed ratio from inside to outside, the dynamic adjustment of the rotating speed of the drum screen significantly improves the retention efficiency and reduces the energy consumption, matches the retention requirements of fibers of different lengths, and realizes the hierarchical retention and fine recovery of fibers;

[0021] The filter screen structure of the filtering mechanism is combined and used by the outer arc filter screen and the inner arc filter screen arranged in an interlaced manner, the outer arc filter screen and the inner arc filter screen are simultaneously moved by the hydraulic cylinder, and the interception inner diameter and the layer spacing of the first filtering mechanism, the second filtering mechanism and the third filtering mechanism are adjusted during the movement, the fiber particle size distribution is dynamically matched, the loss of fine fibers is reduced, the spacing is expanded to reduce the flow resistance during high load, the spacing is reduced to improve the retention rate during low load, and the preventive spacing adjustment avoids fiber caking and mechanical overload. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 The present application is a process flow chart;

[0023] Fig. 2 The first structure diagram of the primary filter device of the present application is shown;

[0024] Fig. 3 The second structure diagram of the primary filter device of the present application is shown;

[0025] Fig. 4 The cross-sectional view of the primary filter device of the present application is shown;

[0026] Fig. 5 The cross-sectional view of the transmission box of the present application is shown;

[0027] Fig. 6 The internal structure diagram of the sprocket box of the present application is shown.

[0028] LEGEND:

[0029] 1, support; 2, support beam; 3, support arm; 4, ring type seat; 5, transmission box; 6, first filtering mechanism; 7, second filtering mechanism; 8, third filtering mechanism; 9, mounting arm; 10, support rod; 11, high-pressure nozzle; 12, sewage collecting tank; 13, collecting bin; 14, sewage pipe; 15, first blocking ring plate; 16, first outer arc filter screen; 17, first inner arc filter screen; 18, first hydraulic cylinder; 19, second blocking ring plate; 20, second outer arc filter screen; 21, second inner arc filter screen; 22, second hydraulic cylinder; 23, third blocking ring plate; 24, third outer arc filter screen; 25, third inner arc filter screen; 26, third hydraulic cylinder; 27, swivel ring seat; 28, chain gear box; 29, motor; 30, first inner tooth; 31, first rotating tooth; 32, second inner tooth; 33, second rotating tooth; 34, third inner tooth; 35, third rotating tooth; 36, transmission shaft; 37, chain gear; 38, chain. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] The specific embodiments are given below.

[0032] Reference Figs. 1-6 A wood pulp white card processing wastewater treatment device, comprising a preliminary filtration device, a regulating pool, 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, wastewater is subjected to three-stage filtration through the preliminary filtration device to remove large-particle fibers, waste chips and impurities and reduce suspended matter load, the wastewater enters the regulating pool and stays for 4-8 hours, the wastewater enters the primary sedimentation tank and is deposited 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 to control pH 6.8-7.5 and temperature 35±2℃, 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 to maintain DO at 2-4 mg / L, 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, H2O2 50-200 mg / L and Fe 2+1:1-1:5 molar ratio, pH=3-4, reaction 60-120 minutes, degradation of refractory organic matter, finally the wastewater is filtered by the activated carbon adsorption machine to remove residual COD and color, ensuring that the effluent COD≤80 mg / L, color≤50 times, wherein the sludge in the primary sedimentation tank, UASB reactor and aeration tank is fed into the thickening tank, dewatered by the filter press, and the sludge moisture content is reduced to 60-70%;

[0033] The primary filtering device comprises a support 1, two support cross beams 2 are installed on the support 1, support arms 3 are installed at one end of the two support cross beams 2, a plurality of ring seats 4 are installed on the support arms 3, a transmission box 5 is installed at the other end of the two support cross beams 2, a first filtering mechanism 6, a second filtering mechanism 7 and a third filtering mechanism 8 are rotatably installed between the ring seats 4 and the transmission box 5, and the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 are coaxially arranged from inside to outside;

[0034] The support arms 3 are provided with mounting arms 9, a plurality of support rods 10 and a sewage collecting tank 12 are installed on the mounting arms 9, a plurality of high-pressure nozzles 11 are installed at the bottom side of the support rods 10, a collecting bin 13 in communication with the sewage collecting tank 12 is installed on the mounting arms 9, a sewage discharge pipe 14 is installed on the collecting bin 13, the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 are cleaned by spraying water through the high-pressure nozzles 11, the cleaned fibers and wastewater fall into the sewage collecting tank 12, and are discharged through the collecting bin 13 and the sewage discharge pipe 14.

[0035] The first filtering mechanism 6 comprises two first blocking ring plates 15, a plurality of first outer arc filter screens 16 and first inner arc filter screens 17 are installed at equal intervals between the two first blocking ring plates 15, and the first outer arc filter screens 16 and the first inner arc filter screens 17 are arranged alternately, the filter hole size of the first outer arc filter screens 16 and the first inner arc filter screens 17 is 8-10 mm, a plurality of first hydraulic cylinders 18 are installed at equal intervals on the first blocking ring plate 15, and the extension end of the first hydraulic cylinder 18 is connected with the end of the first outer arc filter screen 16 and the first inner arc filter screen 17, the second filtering mechanism 7 comprises two second blocking ring plates 19, a plurality of second outer arc filter screens 20 and second inner arc filter screens 21 are installed at equal intervals between the two second blocking ring plates 19, and the second outer arc filter screens 20 and the second inner arc filter screens 21 are arranged alternately, the filter hole size of the second outer arc filter screens 20 and the second inner arc filter screens 21 is 3-5 mm, a plurality of second hydraulic cylinders 22 are installed at equal intervals on the second blocking ring plate 19, and the extension end of the second hydraulic cylinder 22 is connected with the end of the second outer arc filter screen 20 and the second inner arc filter screen 21, the third filtering mechanism 8 comprises two third blocking ring plates 23, a plurality of third outer arc filter screens 24 and third inner arc filter screens 25 are installed at equal intervals between the two third blocking ring plates 23, and the third outer arc filter screens 24 and the third inner arc filter screens 25 are arranged alternately, the filter hole size of the third outer arc filter screens 24 and the third inner arc filter screens 25 is 1-2 mm, a plurality of third hydraulic cylinders 26 are installed at equal intervals on the third blocking ring plate 23, and the extension end of the third hydraulic cylinder 26 is connected with the end of the third outer arc filter screen 24 and the third inner arc filter screen 25, a rotating ring seat 27 is arranged outside the first blocking ring plate 15, the second blocking ring plate 19 and the third blocking ring plate 23, the rotating ring seat 27 is respectively connected with the ring seat 4 and the bearing of the transmission box 5, a first internal tooth 30 is arranged inside the rotating ring seat 27 at one end of the first blocking ring plate 15, the first internal tooth 30 is engaged with a first rotating tooth 31, a second internal tooth 32 is arranged inside the rotating ring seat 27 at one end of the second blocking ring plate 19, the second internal tooth 32 is engaged with a second rotating tooth 33, a third internal tooth 34 is arranged inside the rotating ring seat 27 at one end of the third blocking ring plate 23, the third internal tooth 34 is engaged with a third rotating tooth 35, a chain tooth box 28 is installed outside the transmission box 5, the first rotating tooth 31, the second rotating tooth 33 and the third rotating tooth 35 are installed with chain teeth 37 in the chain tooth box 28 through a transmission shaft 36, and the three chain teeth 37 are connected through a chain 38, a motor 29 is installed on the chain tooth box 28, and the output end of the motor 29 is connected with one of the chain teeth 37, the rotation speed ratio of the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 per minute is 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 wastewater enters the first filtering mechanism 6, the first rotating tooth 31, the second rotating tooth 33 and the third rotating tooth 35 are driven to rotate by the chain teeth 37 and the chain 38 through the work of the motor 29, at this time, the first rotating tooth 31 is engaged with the first internal tooth 30 to drive the first filtering mechanism 6 to rotate,The second rotating tooth 33 meshes with the second internal tooth 32 to drive the second filtering mechanism 7 to rotate, the third rotating tooth 35 meshes with the third internal tooth 34 to drive the third filtering mechanism 8 to rotate, the first outer arc filter screen 16 and the first inner arc filter screen 17 in the rotating first filtering mechanism 6 intercept long fibers greater than 10 mm, the second outer arc filter screen 20 and the second inner arc filter screen 21 in the rotating second filtering mechanism 7 intercept medium fibers of 5-10 mm, the third outer arc filter screen 24 and the third inner arc filter screen 25 in the rotating third filtering mechanism 8 intercept short fibers less than 5 mm, so that the hierarchical interception is realized, the first outer arc filter screen 16 and the first inner arc filter screen 17 are synchronously moved by the extension and retraction of the first hydraulic cylinder 18, the second outer arc filter screen 20 and the second inner arc filter screen 21 are synchronously moved by the extension and retraction of the second hydraulic cylinder 22, and the third outer arc filter screen 24 and the third inner arc filter screen 25 are synchronously moved by the extension and retraction of the third hydraulic cylinder 26, so that 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.

[0036] The first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 are arranged to perform hierarchical filtration, meanwhile, the first filtering mechanism 6, the second filtering mechanism 7 and the third filtering mechanism 8 have an increasing internal-to-external rotation speed ratio, the rotation speed of the drum screen is dynamically adjusted, the interception efficiency is significantly improved, the energy consumption is reduced, the interception requirements of fibers of different lengths are matched, and the hierarchical interception and fine recovery of fibers are realized.

[0037] The filter screen structure of the filtering mechanism is combined and used by the outer arc filter screen and the inner arc filter screen arranged in a staggered mode, the outer arc filter screen and the inner arc filter screen are simultaneously moved by the hydraulic cylinder, and 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, the fiber particle size distribution is dynamically matched, the fine fiber loss is reduced, the spacing is enlarged to reduce the flow resistance when the load is high, the spacing is reduced to improve the interception rate when the load is low, and the preventive spacing adjustment avoids fiber caking and mechanical overload.

[0038] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

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, wherein the primary filtration device comprises a bracket (1), two brackets (1) are mounted with support beams (2), one end of the two support beams (2) is mounted with a support arm (3), a plurality of annular seats (4) are mounted on the support arm (3), the other end of the two support beams (2) is mounted with a transmission box (5), a first filter mechanism (6), a second filter mechanism (7) and a third filter mechanism (8) are rotatably mounted 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 cocentrically 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 provided on the mounting arm (9), and a plurality of high-pressure nozzles (11) are provided on the bottom side of the support rod (10), a collection bin (13) in communication with the sewage collecting tank (12) is provided on the mounting arm (9), and a sewage discharge pipe (14) is provided on the collection bin (13); 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 pore size of the first outer arc filters (16) and the first inner arc filters (17) is 8-10 mm; 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); 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 pore size of the second outer arc filters (20) and the second inner arc filters (21) is 3-5 mm; 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); 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 in an alternating manner, and the filter pore size of the third outer arc filters (24) and the third inner arc filters (25) is 1-2 mm; 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); 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 their outer sides, and the swivel seat (27) is respectively connected to the ring seat (4) and the transmission box (5) bearing; A first inner 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 inner tooth (30) is meshed with the first rotating tooth (31); a second inner 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 inner tooth (32) is meshed with the second rotating tooth (33); a third inner 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 inner tooth (34) is meshed with the third rotating tooth (35); the outer side of the transmission box (5) A sprocket box (28) is installed, 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). 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 speed ratio of the first filtering mechanism (6), the second filtering mechanism (7) and the third filtering mechanism (8) is 1:2:3; 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 the interlayer spacing of the first filter mechanism (6), the second filter mechanism (7) and the third filter mechanism (8).

2. The operating method of a wood pulp white card processing wastewater treatment device according to claim 1, characterized in that: The working method includes: Step 1: The wastewater is filtered through the primary filtration device to achieve three-stage filtration, remove large particles of fiber, 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 and settles 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 and is controlled at pH 6.8-7.5, temperature 35±2℃, residence time 12-24 hours, and organic load 4-10kg COD / (m 3 d), COD removal rate is 60-80%, wastewater enters the aeration tank with DO maintained at 2-4 mg / L, sludge concentration at 3000-5000 mg / L, COD further reduced to 100-200 mg / L, wastewater enters the 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, and finally the wastewater enters the activated carbon adsorption machine to filter the residual COD and chroma, ensuring that the effluent COD ≤ 80mg / L and chroma ≤ 50 times. The sludge from the primary sedimentation tank, UASB reactor and aeration tank enters the thickening tank and is dehydrated by the filter press to reduce the sludge moisture content 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 engaged with the first inner tooth (30) to drive the first filter mechanism (6) to rotate, the second rotating tooth (33) is engaged with the second inner tooth (32) to drive the second filter mechanism (7) to rotate, and the third rotating tooth (35) is engaged with the third inner tooth (34) to drive the third filter mechanism (8) to rotate. The first outer arc filter (16) and the first inner arc filter (17) in the rotating first filter mechanism (6) intercept long fibers larger than 10 mm, and the second outer arc filter (20) in the rotating second filter mechanism (7) is used to intercept long fibers larger than 10 mm. 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 filter mechanism (8) intercept short fibers smaller 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 expansion 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 expansion 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 expansion and contraction of the third hydraulic cylinder (26), thereby adjusting the interception inner diameter and the interlayer spacing of the first filter mechanism (6), the second filter mechanism (7) and the third filter mechanism (8).

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