Sewage treatment mechanism for lignin liquid production

Abstract

The invention discloses a sewage treatment mechanism for lignin liquid production, and belongs to the technical field of lignin liquid sewage treatment.The sewage treatment mechanism comprises a sewage treatment box, and the sewage treatment box is used for feeding lignin liquid sewage to achieve purification treatment; a separation mechanism is arranged at the left end of the sewage treatment box, the separation mechanism comprises a separation box body, and a separation filter plate is arranged at the upper part in the separation box body; a dredging sliding column is arranged at the bottom of the separation filter plate in a sliding manner; a flocculation mechanism is arranged on the left side of the interior of the sewage treatment tank, the flocculation mechanism comprises a flocculation partition plate, and an overflow transverse groove is formed above the flocculation partition plate. According to the sewage treatment mechanism for lignin liquid production, sewage and impurities are separated and then discharged and collected outwards through the separation assembly and the dredging assembly in the separation box body, the contained impurities are flocculated and separated from the sewage through the flocculation mechanism, and the flocculated impurities are blocked through the multiple reverse filtration pore plates, so that sewage discharge is facilitated.

Description

Technical Field

[0001] This invention relates to the field of lignin liquid wastewater treatment technology, specifically to a wastewater treatment facility for lignin liquid production. Background Technology

[0002] Lignin liquid refers to sodium lignin sulfonate, a brown powder extracted from papermaking black liquor. It is easily soluble in water, weakly acidic, biodegradable, and stable at room temperature. It is mainly used as a concrete water-reducing agent, dye dispersant, or pesticide suspending agent. It is a bulk chemical product. In the production process of lignin liquid, the wastewater containing organic and inorganic matter is treated by integrating physical interception, chemical neutralization, and biodegradation technologies to degrade pollutants in the wastewater and achieve discharge compliance or resource recovery.

[0003] Application CN103172212A discloses a method for treating lignin production wastewater. The effluent from the desalination chamber after electrodialysis treatment of the lignin production wastewater is partly reused as dilute acid in the lignin production process and partly reused as lignin washing water. The effluent reused for dilute acid preparation will further precipitate lignin under acidic conditions. Similarly, the effluent used for lignin washing will also precipitate lignin after the lignin solubility reaches saturation. Therefore, reusing the desalination effluent after electrodialysis treatment in the lignin production process not only saves wastewater treatment costs but also facilitates the further extraction of trace amounts of lignin from the desalination effluent.

[0004] Application CN120841732A discloses a process for treating lignin purification wastewater. The two-stage anaerobic process efficiently removes COD and sulfate. Specifically, sulfate is converted to hydrogen sulfide in the first-stage anaerobic unit, and organic matter is converted to methane in the second-stage anaerobic unit, which is then used as stripping gas to remove hydrogen sulfide generated in the first-stage anaerobic unit, preventing microbial poisoning of the sludge in the first-stage anaerobic unit. The effluent from both stages of anaerobic treatment has low COD and salt content, thus reducing the cost of ozone catalytic oxidation treatment and facilitating the selection of common composite microbial communities in the BAF unit, thereby improving its treatment efficiency.

[0005] However, the above-disclosed wastewater treatment methods for lignin liquid production still have the following problems in actual use: lignin liquid and wastewater are treated by chemical means, but the pollutants contained in the wastewater are still easy to adhere to and remain, making it impossible to effectively meet the discharge standards. At the same time, some pollutants in the wastewater have recycling value, but uniform chemical treatment is difficult to separate and treat the pollutants.

[0006] Therefore, we propose a wastewater treatment facility for lignin liquid production to address the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a wastewater treatment facility for lignin liquid production, which solves the problem that existing chemical methods are used to treat lignin liquid and wastewater, but the pollutants contained in the wastewater are still easy to adhere and remain, making it impossible to effectively meet the discharge standards. At the same time, some pollutants in the wastewater have recycling value, but it is difficult to separate and treat the pollutants by uniform chemical treatment.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a wastewater treatment device for lignin liquid production, comprising a wastewater treatment tank for discharging lignin liquid wastewater for purification treatment; and further comprising: The wastewater treatment tank is provided with a separation mechanism at its left end, and the separation mechanism includes a separation box body, and a separation filter plate is provided inside the upper part of the separation box body. Among them, a guide column is slidably installed at the bottom of the separation filter plate, and the guide column is raised to unclog the separation filter plate; The wastewater treatment tank has a flocculation mechanism on its left side, which includes a flocculation baffle and an overflow trough above the flocculation baffle.

[0009] Preferably, the separation mechanism includes a separation box that is fixedly installed inside the left end of the sewage treatment tank, and a horizontal discharge groove is provided at the lower right end of the separation box for discharging the separated lignin liquid sewage into the sewage treatment tank. The bottom of the separation box is inclined with the left side higher than the right side to facilitate sewage flow.

[0010] Preferably, the separation mechanism includes a cleaning scraper, the left end of which slides through the outside of the separation chamber, and a reciprocating screw is rotatably mounted on the outside of the separation chamber via a bearing, with the reciprocating screw threaded through the left end of the cleaning scraper. Meanwhile, the cleaning scraper has an inverted "T" shaped structure that slides against the top surface of the separation filter plate.

[0011] Preferably, the separation mechanism includes a drain trough, which is located at the front and rear ends of the upper part of the separation box. Both the front and rear ends of the upper part of the separation box are equipped with anti-overflow baffles via torsion springs. In the initial state, the anti-overflow baffles cover the outside of the drain trough and rotate due to the contact of the cleaning scraper, so that the filtered dirt is discharged to the outside of the separation box through the drain trough.

[0012] Preferably, the separation mechanism includes a guide plate, which is slidably disposed at equal distances on the bottom surface of the separation filter plate. The outer end of the guide plate slides through the outside of the separation box through a return spring. The top surface of the guide plate is fixedly connected to the bottom end of the guide slide columns distributed at equal distances. The guide slide columns are distributed one-to-one with the filter holes opened on the separation filter plate.

[0013] Preferably, the separation mechanism includes transmission brackets fixedly installed at the left and right ends of the cleaning scraper, and a traction tripod is fixedly provided at the bottom end of each transmission bracket. The traction tripod is attached to the outer end of the guide plate and is used to slide upward by the traction tripod against the guide plate and the guide slide column when the cleaning scraper drives the transmission bracket to move back and forth.

[0014] Preferably, the flocculation mechanism includes a flocculation baffle fixedly installed on the inside left side of the sewage treatment tank, and a flocculation feeding box is fixedly installed at the top of the flocculation baffle. A mixing shaft is rotatably installed inside the flocculation feeding box via a bearing, and the lower end of the mixing shaft extends into the inside of the sewage treatment tank to mix and stir the separated sewage.

[0015] Preferably, the flocculation mechanism includes a feeding turntable fixedly installed on the outer wall above the mixing shaft, and both the feeding turntable and the flocculation feeding box have feeding slots inside. The mixing shaft drives the feeding turntable to rotate, so that the flocculant is intermittently fed when the feeding slots overlap.

[0016] Preferably, the flocculation mechanism includes a reverse filter plate fixedly installed at equal intervals on the right side of the flocculation partition, and flow-blocking cones are fixedly installed at equal intervals on the upper surface of the reverse filter plate, and the upper end of the lower flow-blocking cone is attached to the bottom surface of the upper reverse filter plate, and the uppermost reverse filter plate is lower than the overflow transverse groove inside the flocculation partition.

[0017] Preferably, the flocculation mechanism includes a secondary filter box, which is fixedly installed inside the right end of the wastewater treatment tank. A secondary filter element module is fixedly installed inside the secondary filter box, and a drain hole is provided on the lower left side and the upper right side of the secondary filter box for discharging the treated wastewater.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This wastewater treatment device for lignin liquid production separates wastewater from impurities through the separation and guiding components inside the separation tank and discharges them for collection. The flocculation mechanism then separates the impurities contained therein from the wastewater. After passing through multiple reverse filter plates, the flocculated impurities are blocked, facilitating wastewater discharge. The specific details are as follows: 1. Wastewater enters the separation tank and is treated by the separation filter plate. The wastewater flows downward through the discharge trough to the left side of the inside of the wastewater treatment tank for settling and subsequent treatment. The reciprocating rotation outside the separation tank drives the cleaning scraper to slide back and forth inside the separation tank, thereby sticking to the separation filter plate and pushing and scraping off the dirt on its upper surface.

[0019] Furthermore, when the scraper moves to the front and rear sides of the separation box, its bottom end contacts the anti-overflow baffle and flips upward, thereby opening the sewage discharge chute and driving the pushed sewage from the sewage discharge chute to the outside of the separation box for treatment and collection.

[0020] 2. During the movement of the cleaning scraper inside the separation box, the transmission bracket and the traction tripod move synchronously. When the traction tripod moves, it abuts against the ends of the guide horizontal plates that are set at equal intervals, so that the corresponding guide horizontal plates drive the guide slide column to slide upward and insert into the filter holes of the separation filter plate, assisting in the unblocking and cleaning of the separation filter plate. The sliding cleaning scraper pushes the blocked dirt for processing.

[0021] 3. The mixing shaft inside the flocculation feeding box rotates, causing the feeding turntable above to rotate below the flocculation feeding box, so that the corresponding feeding slots overlap with each other, which helps to add the flocculant inside the flocculation feeding box. When the mixing shaft rotates, the flocculant is mixed with the sewage, so that the small impurities can be separated from the sewage after sedimentation.

[0022] 4. After the sewage accumulates, it flows through the overflow trough to one side of the reverse filter plate, where the flocculated debris is separated by the reverse filter plate. The debris is blocked by the equally spaced flow-blocking cones, thus preventing it from flowing synchronously with the sewage. As the sewage continues to accumulate, it enters the secondary filter box through the drain hole, is treated by the secondary filter module, and is then discharged. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the flocculation baffle of the present invention; Figure 3 This is a three-dimensional structural diagram of the separation box of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the structure of the guide column after it rises according to the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C; Figure 8 This is a schematic diagram of the mixing shaft installation structure of the present invention; Figure 9 This is a schematic diagram of the installation structure of the reverse filter plate and the flow-blocking cone strip of the present invention; Figure 10 This is a schematic diagram of the installation structure of the feeding turntable of the present invention.

[0024] In the diagram: 1. Wastewater treatment tank; 2. Separation tank; 3. Separation filter plate; 4. Guide slide column; 5. Flocculation baffle; 6. Overflow chute; 7. Feeding chute; 8. Reciprocating screw; 9. Sewage discharge chute; 10. Anti-overflow baffle; 11. Guide plate; 12. Return spring; 13. Sludge scraper; 14. Transmission bracket; 15. Traction tripod; 16. Flocculation feeding box; 17. Mixing shaft; 18. Feeding turntable; 19. Feeding trough; 20. Reverse filter plate; 21. Flow-blocking cone; 22. Secondary filter tank; 23. Secondary filter module; 24. Sewage discharge hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-10 The present invention provides the following technical solution: Example 1: To solve the existing problems, this example discloses the following technical solution: a wastewater treatment mechanism for lignin liquid production, including a wastewater treatment tank 1, which is used to purify lignin liquid wastewater; a separation mechanism is provided at the left end of the wastewater treatment tank 1, and the separation mechanism includes a separation box 2, and a separation filter plate 3 is provided at the top inside the separation box 2; wherein, a guide column 4 is slidably provided at the bottom of the separation filter plate 3, and the guide column 4 is raised to clear the separation filter plate 3; the separation box 2 included in the separation mechanism is fixedly installed inside the left end of the wastewater treatment tank 1, and a horizontal groove 7 is opened at the lower right end of the separation box 2 for discharging the separated lignin liquid wastewater into the wastewater treatment tank 1, and the bottom of the separation box 2 is inclined with the left side higher and the right side lower to facilitate wastewater flow.

[0027] The separation mechanism includes a cleaning scraper 13, the left end of which slides through the outside of the separation chamber 2. A reciprocating screw 8 is rotatably mounted on the outside of the separation chamber 2 via a bearing, and the reciprocating screw 8 is threaded through the left end of the cleaning scraper 13. The cleaning scraper 13 is in an inverted "T" shape and slides against the top surface of the separation filter plate 3. The separation mechanism includes a discharge trough 9, which is located at the front and rear ends of the upper part of the separation chamber 2. An anti-overflow baffle 10 is rotatably mounted on the front and rear ends of the upper part of the separation chamber 2 via a torsion spring. In the initial state, the anti-overflow baffle 10 covers the outside of the discharge trough 9 and rotates due to the contact of the cleaning scraper 13, discharging the filtered dirt through the discharge trough 9 to the outside of the separation chamber 2.

[0028] like Figures 3-4 As shown, when treating wastewater containing lignin liquid, the wastewater is first fed into the separation tank 2 at the left end of the wastewater treatment tank 1. After the wastewater comes into contact with the separation filter plate 3 inside the separation tank 2, the solids and dirt contained inside are separated, allowing the wastewater to continue to flow downwards. It is guided by the inclined structure at the bottom of the separation tank 2, which is higher on the left and lower on the right, and then flows into the left side of the inside of the wastewater treatment tank 1 through the opening of the feeding trough 7.

[0029] Furthermore, the dirt separated inside the separation chamber 2 is located on the upper surface of the separation filter plate 3. Then, the reciprocating screw 8 on the left side of the separation chamber 2 is rotated by a motor, and the threaded scraper 13 moves back and forth above the separation filter plate 3. During the movement, the scraper 13 scrapes and pushes the dirt on the upper surface of the separation filter plate 3 by its bottom end. When it moves to the front and rear sides of the separation chamber 2, the bottom end of the scraper 13 passes through the sewage discharge trough 9 and touches the anti-overflow baffle 10 to flip upward, thereby opening the sewage discharge trough 9 and pushing the dirt to the outside of the separation chamber 2 for processing and collection.

[0030] Example 2: To solve the existing problems, this example discloses the following technical solution: a wastewater treatment mechanism for lignin liquid production, the separation mechanism includes a guide plate 11, which is slidably disposed on the bottom surface of the separation filter plate 3 at equal distances, and the outer end of the guide plate 11 slides through the outside of the separation box 2 through a return spring 12, and the top surface of the guide plate 11 is fixedly connected to the bottom end of the guide slide column 4 distributed at equal distances, and the guide slide column 4 is distributed one-to-one with the filter holes opened in the separation filter plate 3; the separation mechanism includes a transmission bracket 14 fixedly installed on the left and right ends of the cleaning scraper 13, and the bottom end of the transmission bracket 14 is fixedly provided with a traction tripod 15, and the traction tripod 15 is attached to the outer end of the guide plate 11, so that when the cleaning scraper 13 drives the transmission bracket 14 to move back and forth, the traction tripod 15 slides upward against the guide plate 11 and the guide slide column 4.

[0031] like Figures 6-7 As shown, during the movement of the cleaning scraper 13 inside the separation box 2, it drives the transmission brackets 14 on the left and right sides and the traction tripod 15 to slide synchronously. When the traction tripod 15 moves, it slides upward against the guide horizontal plates 11 that are distributed at equal distances. When the guide horizontal plates 11 rise, they drive the guide sliding column 4 to insert upward into the filter holes inside the separation filter plate 3, thereby clearing and lifting the dirt inside the blocked separation filter plate 3. This works in conjunction with the moving cleaning scraper 13 to clean the filter plate, thus preventing the sewage treatment effect from being affected by blockage during long-term separation and filtration. At the same time, the guide plates that are fixedly installed above the separation filter plate 3 and above the guide horizontal plates 11 inside the separation box 2 are inclined inward at the bottom, thereby preventing sewage from flowing outward through the slot and causing pollution, and ensuring that the sewage always flows inside the separation box 2.

[0032] Example 3: To solve the existing problems, this example discloses the following technical solution: a wastewater treatment mechanism for lignin liquid production. A flocculation mechanism is provided on the left side of the inside of the wastewater treatment tank 1. The flocculation mechanism includes a flocculation baffle 5, and an overflow transverse groove 6 is provided above the flocculation baffle 5. The flocculation baffle 5 is fixedly installed on the left side of the inside of the wastewater treatment tank 1. A flocculation feeding box 16 is fixedly provided at the top of the flocculation baffle 5. A mixing shaft 17 is rotatably provided inside the flocculation feeding box 16 through a bearing. The lower end of the mixing shaft 17 extends into the inside of the wastewater treatment tank 1 to mix and stir the separated wastewater.

[0033] The flocculation mechanism includes a feeding turntable 18 fixedly installed on the outer wall above the mixing shaft 17. Both the feeding turntable 18 and the flocculation feeding box 16 have feeding slots 19 inside. The mixing shaft 17 drives the feeding turntable 18 to rotate, so that the flocculant is intermittently fed when the feeding slots 19 overlap.

[0034] like Figure 10 As shown, the separated wastewater flows to the left side of the inside of the wastewater treatment tank 1 and is separated by the flocculation baffle 5. Then, the mixing shaft 17 inside the top flocculation feeding box 16 rotates, which in turn drives the feeding turntable 18 on the outer wall to rotate at the bottom of the flocculation feeding box 16. Then, the feeding turntable 18 drives the feeding slot 19 opened inside to rotate until it coincides with the feeding slot 19 at the bottom of the flocculation feeding box 16. After the feeding slot 19 is opened, the flocculant inside the flocculation feeding box 16 is released downwards and mixed with the treated wastewater. The flocculation treatment is assisted by the rotation of the mixing shaft 17. After the wastewater is continuously treated and accumulated and exceeds the overflow chute 6 above the flocculation baffle 5, it flows to the right side of the inside of the wastewater treatment tank 1 for treatment through the overflow chute 6.

[0035] Example 4: To solve the existing problems, this example discloses the following technical solution: a wastewater treatment mechanism for lignin liquid production, the flocculation mechanism includes a reverse filter plate 20 fixedly installed at equal intervals on the right side of the flocculation partition 5, and flow-blocking cone strips 21 are fixedly installed at equal intervals on the upper surface of the reverse filter plate 20, and the upper end of the lower flow-blocking cone strip 21 is attached to the bottom surface of the upper reverse filter plate 20, and the uppermost reverse filter plate 20 is lower than the overflow transverse groove 6 inside the flocculation partition 5; the flocculation mechanism includes a secondary filter box 22, and the secondary filter box 22 is fixedly installed inside the right end of the wastewater treatment tank 1, and a secondary filter element module 23 is fixedly installed inside the secondary filter box 22, and a sewage discharge trough hole 24 is opened on the lower left side and the upper right side of the secondary filter box 22 for discharging the treated wastewater.

[0036] like Figures 8-9 As shown, the sewage on the right side of the sewage treatment tank 1 contacts the reverse filter plate 20 and is filtered again through the reverse filter plate 20. As the sewage continues to accumulate, the liquid level rises, and some of the solids remaining in the sewage are blocked by the flow-blocking cone strip 21, thus preventing them from flowing with the sewage. When the sewage accumulates upward, it enters the interior of the secondary filter tank 22 through the sewage discharge hole 24, so that it can be filtered further by the secondary filter module 23, and then discharged outward through the sewage discharge hole 24 on the right side for discharge and subsequent processing.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sewage treatment mechanism for lignin liquid production, comprising a sewage treatment box (1) for putting lignin liquid sewage to achieve purification treatment; characterized in that Further comprising: The left end of the sewage treatment box (1) is provided with a separation mechanism, and the separation mechanism comprises a separation box body (2), and the upper part of the inside of the separation box body (2) is provided with a separation filter plate (3); Wherein, the bottom of the separation filter plate (3) is slidably provided with a dredging slide column (4), and the dredging slide column (4) is dredged for the separation filter plate (3) through the rising needle; The inside left side of the sewage treatment box (1) is provided with a flocculation mechanism, and the flocculation mechanism comprises a flocculation partition plate (5), and the upper part of the flocculation partition plate (5) is provided with an overflow horizontal groove (6).

2. The sewage treatment mechanism for lignin liquid production according to claim 1, characterized in that: The separation mechanism comprises a separation box body (2) fixedly installed at the left end inside of the sewage treatment box (1), and a putting horizontal groove (7) is formed at the right lower part of the separation box body (2), for putting the lignin liquid sewage after separation into the inside of the sewage treatment box (1), and the bottom end of the separation box body (2) is inclined in a left high and right low manner to facilitate the flow of sewage.

3. The sewage treatment mechanism for lignin liquid production according to claim 2, characterized in that: The separation mechanism comprises a decontamination scraper (13), the left end of the decontamination scraper (13) is slidably penetrated to the outside of the separation box body (2), the outside of the separation box body (2) is rotatably provided with a reciprocating wire rod (8) through a bearing, the left end of the decontamination scraper (13) is threadedly penetrated to the reciprocating wire rod (8), and the decontamination scraper (13) is in an inverted "T" shape structure and is slidably attached to the top surface of the separation filter plate (3).

4. The sewage treatment mechanism for lignin liquid production according to claim 3, characterized in that: The separation mechanism comprises a sewage discharge horizontal groove (9), and the sewage discharge horizontal groove (9) is formed at the front and rear ends of the upper part of the separation box body (2), and the front and rear ends of the upper part of the separation box body (2) are both rotatably provided with a anti-overflow partition plate (10) through a torsion spring, the anti-overflow partition plate (10) in the initial state covers the outside of the sewage discharge horizontal groove (9), and is rotated by the abutment of the decontamination scraper (13), and the filtered sewage is discharged to the outside of the separation box body (2) through the sewage discharge horizontal groove (9).

5. The sewage treatment mechanism for lignin liquid production according to claim 4, characterized in that: The separation mechanism comprises a dredging horizontal plate (11), and the dredging horizontal plate (11) is slidably arranged at equal distances on the bottom surface of the separation filter plate (3), and the outer end of the dredging horizontal plate (11) is slidably penetrated to the outside of the separation box body (2) through a return spring (12), and the top surface of the dredging horizontal plate (11) is fixedly connected to the bottom end of the equal-distance distributed dredging slide column (4), and the dredging slide column (4) is distributed one-to-one with the filter holes formed in the separation filter plate (3).

6. The sewage treatment mechanism for lignin liquid production according to claim 5, characterized in that: The separation mechanism comprises a transmission bracket (14) fixedly installed at the left and right ends of the decontamination scraper (13), and the bottom end of the transmission bracket (14) is fixedly provided with a traction tripod (15), and the traction tripod (15) is attached to the outer end of the dredging horizontal plate (11), for abutting the dredging horizontal plate (11) and the dredging slide column (4) to slide upward when the decontamination scraper (13) drives the transmission bracket (14) to reciprocate.

7. The sewage treatment mechanism for lignin liquid production according to claim 1, characterized in that: The flocculation mechanism comprises a flocculation partition plate (5) fixedly installed on the left side of the inside of the sewage treatment tank (1), and the top end of the flocculation partition plate (5) is fixedly provided with a flocculation feeding tank (16), and the inside of the flocculation feeding tank (16) is rotatably provided with a mixing shaft (17) through a bearing, and the lower end of the mixing shaft (17) extends into the inside of the sewage treatment tank (1) for mixing and stirring the separated sewage.

8. The sewage treatment mechanism for lignin liquid production according to claim 7, characterized in that: The flocculation mechanism comprises a feeding turntable (18) fixedly installed on the outer wall above the mixing shaft (17), and the inside of the feeding turntable (18) and the inside of the flocculation feeding tank (16) are both provided with feeding notches (19), and the mixing shaft (17) drives the feeding turntable (18) to rotate, so that when the feeding notches (19) coincide with each other, the flocculation treatment agent is intermittently fed.

9. The sewage treatment mechanism for lignin liquid production according to claim 8, characterized in that: The flocculation mechanism comprises a back filtration hole plate (20) fixedly installed at equal distances on the right side of the flocculation partition plate (5), and the upper surface of the back filtration hole plate (20) is fixedly installed with flow resistance cone strips (21) at equal distances, and the upper end of the lower flow resistance cone strip (21) is attached to the bottom surface of the upper back filtration hole plate (20), and the uppermost back filtration hole plate (20) is lower than the overflow horizontal groove (6) on the inside of the flocculation partition plate (5).

10. The sewage treatment mechanism for lignin liquid production according to claim 9, characterized in that: The flocculation mechanism comprises a back filtration tank body (22), and the back filtration tank body (22) is fixedly installed on the right end of the inside of the sewage treatment tank (1), and the inside of the back filtration tank body (22) is fixedly installed with a back filtration core module (23), and the left side of the back filtration tank body (22) is provided with a sewage discharge groove (24) on the lower side and on the upper right side, for discharging the treated sewage.

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