Treatment system for reconstituted tobacco wastewater

Abstract

The invention relates to the technical field of sewage treatment, and provides a treatment system for reconstituted tobacco wastewater, which comprises a sewage pretreatment unit, a fiber recovery unit and a fiber drying unit, the sewage pretreatment unit comprises a first water collecting tank, a second water collecting tank, a coarse screen and a fine screen; reconstituted tobacco wastewater is introduced into the first water collecting tank; the water inlet of the second water collecting tank is communicated with the water outlet of the first water collecting tank; the fiber recovery unit comprises a third water collecting tank, a recovery plate and a recovery box; the water inlet of the third water collecting tank is communicated with the water outlet of the second water collecting tank; the fiber drying unit comprises a sedimentation tank and a sludge treatment tank; a water inlet of the sedimentation tank is communicated with a water outlet of the third water collecting tank, and a sludge outlet of the sedimentation tank is connected with a sludge inlet of the sludge treatment tank. According to the method, the fibers can be effectively recycled, the chromaticity and COD of the wastewater are reduced, and the reconstituted tobacco wastewater treatment efficiency and effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a treatment system for reconstituted tobacco wastewater. Background Art

[0002] Papermaking reconstituted tobacco is a tobacco product made from tobacco materials such as tobacco stems and tobacco dust as the main raw materials, using papermaking technology and equipment. The tobacco raw materials are soaked in water and then separated into solid and liquid, and the water-soluble and insoluble substances in the tobacco are separated. The insoluble substances are pulped and made into a fiber sheet base through a papermaking machine, while the water-soluble substances are concentrated and then reduced and added to the base sheet, and finally dried to become papermaking reconstituted tobacco.

[0003] Wastewater from the production process of papermaking reconstituted tobacco is a special type of industrial wastewater. The sources of wastewater from papermaking reconstituted tobacco are complex, mainly including: leaf line and stem line sedimentation discharge, equipment cleaning discharge, papermaking discharge of concentrated white water, stem and leaf extract and evaporation condensate discharge, coating liquid, etc.

[0004] The characteristics of papermaking reconstituted tobacco wastewater are: large wastewater discharge, high chroma, high chemical oxygen demand, and high fiber suspended matter in the wastewater. This industrial wastewater treatment process mainly uses physical and chemical methods and biological methods, and mainly achieves wastewater discharge standards through aeration sedimentation, microbial degradation, and chemical reagent catalytic oxidation. The existing reconstituted tobacco wastewater treatment process has low sewage treatment efficiency, more chemical reagents are added, and fibers cannot be effectively recovered, wasting resources. Summary of the invention

[0005] The present invention mainly solves the technical problems of low sewage treatment efficiency, large amount of chemical reagents added, and ineffective fiber recovery in the existing reconstituted tobacco wastewater treatment process, and proposes a treatment system for reconstituted tobacco wastewater to achieve effective fiber recovery, reduce the chroma and COD of the wastewater, and improve the efficiency and effect of reconstituted tobacco wastewater treatment.

[0006] The present invention provides a treatment system for recycled tobacco wastewater, comprising: a sewage pretreatment unit, a fiber recovery unit and a fiber drying unit;

[0007] The sewage pretreatment unit comprises: a first water collection tank, a second water collection tank, a coarse grid and a fine grid;

[0008] The first water collection tank is connected to the first automatic dosing device.

[0009] The metal bars of the coarse grid are placed in the first water collection tank and below the water inlet of the first water collection tank;

[0010] The water inlet of the second water collecting tank is connected to the water outlet of the first water collecting tank, and the second water collecting tank is connected to a second automatic dosing device;

[0011] The metal bars of the fine grid are placed in the second water collection tank and below the water inlet of the second water collection tank;

[0012] The fiber recovery unit comprises: a third water collection tank, a recovery plate and a recovery box;

[0013] The water inlet of the third water collecting tank is connected to the water outlet of the second water collecting tank, and the third water collecting tank is connected to a third automatic dosing device;

[0014] A filter screen is arranged in the third water collection tank; a liftable scraper is arranged on the top of the third water collection tank;

[0015] One end of the recovery plate extends into the third water collection tank, and the other end extends into the recovery box;

[0016] The fiber drying unit comprises: a sedimentation tank and a sludge treatment tank;

[0017] The water inlet of the sedimentation tank is communicated with the water outlet of the third water collecting tank, and the sludge outlet of the sedimentation tank is connected with the sludge inlet of the sludge treatment tank.

[0018] Preferably, a first agitator is disposed in the first water collecting tank, and a second agitator is disposed in the second water collecting tank.

[0019] Preferably, the first automatic dosing device adds one or more of polyferric sulfate, polyaluminium sulfate, polyferric chloride and polyaluminium chloride.

[0020] Preferably, the second automatic dosing device adds activated carbon.

[0021] Preferably, the third automatic dosing device adds a polyacrylamide solution.

[0022] Preferably, the third water collection tank is provided with a filter by a multi-stage filter driving device.

[0023] Preferably, an underwater probe is provided in the third water collection tank.

[0024] Preferably, a forward flushing nozzle and a back flushing nozzle are respectively arranged above both ends of the filter in the third water collection tank.

[0025] Preferably, a hot air duct is connected to the top of the recovery box.

[0026] Preferably, the water outlet of the sedimentation tank is connected to the sewage detection tank.

[0027] The present invention provides a treatment system for recycled tobacco wastewater, wherein the sewage pretreatment unit is used to perform preliminary treatment on papermaking wastewater, remove large particle impurities in the wastewater, and decolorize and deodorize. The fiber recovery unit is used to effectively separate the fibers in the wastewater. The fiber drying unit is used to dry the recovered fibers for subsequent use. The present invention optimizes the sewage treatment process of recycled tobacco wastewater, reduces the work pressure of sewage treatment personnel, improves the efficiency and effect of recycled tobacco wastewater treatment, and reduces the addition of chemical reagents. The present invention can achieve effective fiber recovery and effectively reduce the chroma and COD of wastewater, reduce resource waste, reduce environmental pollution, and achieve the purpose of reducing costs and increasing efficiency. The present invention enables the chroma and COD of the treated wastewater to meet the discharge standards and the fibers in the wastewater can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a sewage pretreatment unit in a treatment system for recycled tobacco wastewater provided by the present invention;

[0029] Figure 2 It is a structural schematic diagram of a fiber recovery unit and a fiber drying unit in a system for treating reconstituted tobacco wastewater provided by the present invention;

[0030] Figure 3 The invention provides a process for treating a system for regenerating tobacco wastewater.

[0031] Figure numerals: 1. first water collection tank; 2. second water collection tank; 3. first agitator; 4. coarse screen transmission device; 5. coarse screen; 6. fine screen; 7. first automatic dosing device; 8. liftable brush scraper; 9. underwater probe; 10. conveyor belt; 11. recycling box; 12. multi-stage filter screen drive device; 13. forward flushing nozzle; 14. backwashing nozzle; 15. filter screen; 16. hot air pipe; 17. third water collection tank; 18 sedimentation tank; 19. sludge treatment tank; 20. sewage detection tank; 21. second agitator; 22. fine screen transmission device; 23. second automatic dosing device; 24. third automatic dosing device; 25. sludge. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the contents.

[0033] like Figure 1-2As shown, an embodiment of the present invention provides a system for treating reconstituted tobacco wastewater, comprising: a wastewater pretreatment unit, a fiber recovery unit and a fiber drying unit.

[0034] The sewage pretreatment unit is used to preliminarily treat papermaking wastewater, remove large particle impurities in the wastewater, and decolorize and deodorize. The fiber recovery unit is used to effectively separate the fibers in the wastewater. The fiber drying unit is used to dry the recovered fibers for subsequent use. The present invention enables the chromaticity and COD of the treated wastewater to meet the discharge standards and the fibers in the wastewater can be recycled.

[0035] The sewage pretreatment unit includes: a first water collection tank 1, a second water collection tank 2, a coarse screen 5 and a fine screen 6. The first water collection tank 1 is fed with recycled tobacco wastewater. The first water collection tank 1 is connected to a first automatic dosing device 7; the first automatic dosing device 7 adds one or more of polyferric sulfate, polyaluminium sulfate, polyferric chloride and polyaluminium chloride, and the concentration is 2000-3000mg / L. A first agitator 3 is arranged in the first water collection tank 1, and the first agitator 3 is used to mix the dosing wastewater. The metal bars of the coarse screen 5 are placed in the first water collection tank 1 and are located below the water inlet of the first water collection tank 1. The coarse screen 5 is used to intercept coarse suspended matter and impurities in the wastewater.

[0036] The water inlet of the second water collecting tank 2 is connected to the water outlet of the first water collecting tank 1. The second water collecting tank 2 is connected to the second automatic dosing device 23, and the second automatic dosing device 23 adds activated carbon with a concentration of 300-900 mg / L. The activated carbon plays an adsorption, decolorization and catalytic role, and can effectively remove large particle impurities and other suspended matter in the wastewater. A second agitator 21 is arranged in the second water collecting tank 2, and the second agitator 21 is used to mix the doped wastewater. The metal bars of the fine grid 6 are placed in the second water collecting tank 2 and are located below the water inlet of the second water collecting tank 2. The fine grid 6 is used to continuously and automatically intercept and remove various shapes of debris in the wastewater.

[0037] The fiber recovery unit includes: a third water collection tank 17, a recovery plate 10 and a recovery box 11. The water inlet of the third water collection tank 17 is connected to the water outlet of the second water collection tank 2, and the third water collection tank 17 is connected to a third automatic dosing device 24; the third automatic dosing device 24 adds 2-5 mL / L of 0.5% polyacrylamide solution. A filter screen 15 is arranged in the third water collection tank 17; the filter screen 15 is driven to move along the transmission device shafts on both sides of the third water collection tank 17, and this process is for the filter screen 15 to collect the fibers in the water collection tank 17. Specifically, the third water collection tank 17 is provided with a filter screen 15 through a multi-stage filter screen driving device 12. The multi-stage filter screen driving device 12 includes: a frame and two movable pulleys, the frame is fixedly mounted on the inner wall of the water collection tank 17; the shape of the frame is adapted to the shape of the inner wall of the water collection tank 17; the two movable pulleys are respectively mounted at both ends of the filter screen 15, and the movable pulleys are slidably arranged on the track of the frame. The movable pulley can be lifted and lowered by pulling with a belt or the like, and the two movable pulleys can move at a differential speed. By controlling the differential speed of the movable pulley, the suspended fibers after the dosing are cross-collected in the water collection tank 17. After one collection is completed, the filter screen 15 is tightened by the multi-stage filter screen driving device 12, and the filter screen 15 is cleaned to the conveyor belt 10 by the lifting brush scraper 8, and then the conveyor belt 10 is transported to the recovery box 11 to complete the fiber recovery for subsequent use. After one collection is completed, the cleaning nozzle will clean the filter screen 15, and then repeat the next collection work.

[0038] A liftable scraper 8 is provided on the top of the third water collection tank 17. An underwater probe 9 is provided in the third water collection tank 17, and water quality is fed back through the underwater probe 9. A forward flushing nozzle 13 and a backwashing nozzle 14 are provided above both ends of the filter screen 15 in the third water collection tank 17, respectively, to flush the filter screen 15, prevent the filter screen 15 from being blocked, and achieve an effective fiber filtering effect.

[0039] One end of the conveyor belt 10 extends into the third water collection pool 17, and the other end extends into the recovery box 11; the top of the recovery box 11 is connected to a hot air pipe 16, and the bottom of the hot air pipe 16 is connected to a fan, and the fan is used to send hot air to achieve preliminary drying of the recovered fiber. After drying, the recovered fiber is collected into the recovery box 11 by a recovery scraper for later use.

[0040] The fiber drying unit includes: a sedimentation tank 18 and a sludge treatment tank 19; the water inlet of the sedimentation tank 18 is connected to the water outlet of the third water collection tank 17, and the sludge outlet of the sedimentation tank 18 is connected to the sludge inlet of the sludge treatment tank 19. The water outlet of the sedimentation tank 18 is connected to the sewage detection tank 20.

[0041] The first automatic dosing device 7, the second automatic dosing device 23, the third automatic dosing device 24, the underwater probe 9 and other automatic components are respectively connected to the control center signal, and are automatically controlled by the control center, and can be manually controlled when necessary.

[0042] The working process of the treatment system for recycled tobacco wastewater of the present invention is as follows: Figure 3 As shown:

[0043] The reconstituted tobacco wastewater is collected into the first water collection tank 1 through different workshops, the first automatic dosing device 7 performs the first dosing to the wastewater for coagulation, the first agitator 3 mixes the dosing wastewater, and then the coarse screen 5 is driven by the coarse screen transmission device 4 for the first step of filtration.

[0044] The wastewater filtered in the first step enters the second water collection tank 2, and the second automatic dosing device 23 adds a second dose to the wastewater to adsorb, decolorize and catalyze the wastewater; then the fine grid 6 is driven by the fine grid transmission device 22 to perform the second step of filtration, and the pretreatment is completed at this time.

[0045] The wastewater filtered in the second step enters the third water collection tank 17, and the third water collection tank 17 feedbacks the water quality through the underwater probe 9. The third automatic dosing device 24 automatically adjusts the dosage according to the feedback of the underwater probe 9 to catalyze the water body to perform flocculation and other reactions. At the same time, the multi-stage filter driving device 12 drives the filter 15 to move along the transmission device shaft on both sides of the tank. The filter 15 collects fibers, and then the fibers collected by the liftable scraper 8 are scraped to the recovery plate 10, and the recovered fibers are collected to the recovery box 11 through the recovery plate 10; after a single collection is completed, the positive flushing nozzle 13 and the backwashing nozzle 14 spray and clean the filter 15, and the fiber recovery is completed at this time.

[0046] The hot air pipe 16 performs preliminary drying on the fibers recovered in the recovery box 11 for subsequent reuse.

[0047] The wastewater after fiber recovery in the third water collection tank 17 flows into the sedimentation tank 18 for sedimentation. After the sedimentation is completed, the sludge 25 enters the sludge treatment tank 19 through the lower pipe, and the supernatant enters the sewage detection tank 20.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that modifying the technical solutions described in the aforementioned embodiments, or replacing some or all of the technical features therein by equivalents, does not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for treating recycled tobacco wastewater, characterized in that: include: Wastewater pre-treatment unit, fiber recovery unit and fiber drying unit; The sewage pretreatment unit comprises: a first water collection tank (1), a second water collection tank (2), a coarse screen (5) and a fine screen (6); The first water collection tank (1) is fed with recycled tobacco wastewater, and the first water collection tank (1) is connected to a first automatic dosing device (7); The metal bars of the coarse grid (5) are placed in the first water collection tank (1) and are located below the water inlet of the first water collection tank (1); The water inlet of the second water collecting tank (2) is connected to the water outlet of the first water collecting tank (1), and the second water collecting tank (2) is connected to a second automatic dosing device (23); The metal bars of the fine grid (6) are placed in the second water collection tank (2) and are located below the water inlet of the second water collection tank (2); The fiber recovery unit comprises: a third water collection tank (17), a recovery plate (10) and a recovery box (11); The water inlet of the third water collecting tank (17) is connected to the water outlet of the second water collecting tank (2), and the third water collecting tank (17) is connected to a third automatic dosing device (24); A filter screen (15) is arranged in the third water collection tank (17); a liftable scraper (8) is arranged on the top of the third water collection tank (17); One end of the recovery plate (10) extends into the third water collection tank (17), and the other end extends into the recovery box (11); The fiber drying unit comprises: a sedimentation tank (18) and a sludge treatment tank (19); The water inlet of the sedimentation tank (18) is connected to the water outlet of the third water collecting tank (17), and the sludge outlet of the sedimentation tank (18) is connected to the sludge inlet of the sludge treatment tank (19).

2. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: A first agitator (3) is arranged in the first water collecting tank (1), and a second agitator (21) is arranged in the second water collecting tank (2).

3. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: The first automatic dosing device (7) adds one or more of polyferric sulfate, polyaluminium sulfate, polyferric chloride and polyaluminium chloride.

4. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: The second automatic dosing device (23) adds activated carbon.

5. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: The third automatic dosing device (24) adds a polyacrylamide solution.

6. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: The third water collection tank (17) is provided with a filter screen (15) via a multi-stage filter screen driving device (12).

7. The system for treating recycled tobacco wastewater according to claim 6, characterized in that: An underwater probe (9) is arranged in the third water collecting tank (17).

8. The system for treating recycled tobacco wastewater according to claim 7, characterized in that: A forward flushing nozzle (13) and a backwashing nozzle (14) are respectively arranged above the two ends of the filter screen (15) in the third water collection tank (17).

9. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: The top of the recovery box (11) is connected to a hot air pipe (16).

10. The system for treating recycled tobacco wastewater according to claim 1, characterized in that: The water outlet of the sedimentation tank (18) is connected to the sewage detection tank (20).

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