Reclaimed water recovery mechanism for paper mill sewage treatment

Abstract

The invention relates to the field of reclaimed water recovery of paper mills, in particular to a reclaimed water recovery mechanism for sewage treatment of a paper mill, which is applied to mid-stage water and comprises an aerobic tank, an anaerobic tank, a water inlet pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe, a water outlet pipe and a water outlet pipe, and the aerobic tank is located at one end of the anaerobic tank and used for receiving sewage of the anaerobic tank and performing biochemical treatment on the sewage; according to the method, sewage is subjected to purification treatment through an aerobic tank, a secondary sedimentation tank and a recovery tank in sequence, and in the biochemical treatment process of the sewage through the aerobic tank, an aeration machine acts on a sleeve through an aeration pipe and an aeration head to drive filler to spirally ascend in the sewage, so that the contact area between the filler and microorganisms is rapidly increased in an aerobic environment, and the biofilm culturing time is shortened; and the propagated microorganisms can spirally act on different depths of sewage, so that the sewage can be purified relatively consistently at different depths, the defect that the microorganisms cannot act on a sewage environment far away from the position of the aeration head in a time period is effectively overcome, and the comprehensive efficiency of biochemical treatment of the sewage is improved.

Description

A wastewater recycling mechanism for paper mill wastewater treatment Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to a greywater recycling mechanism for wastewater treatment in paper mills. Background Technology

[0002] Wastewater recycling in paper mills involves deeply purifying wastewater that has met discharge standards and then reusing it for production, thus achieving water resource recycling. Currently, the main target of wastewater recycling is the combined wastewater used for pulp washing and bleaching. In the aerobic tank, microorganisms multiply under oxygen conditions, decomposing organic matter in the wastewater and significantly purifying the water quality. However, it has the following problems.

[0003] The packing material is fixed at the top of the aeration head, which makes the biofilm formation time relatively long. Moreover, the path for microorganisms to act on pollutants in the lower layer of wastewater is significantly shorter than the path for microorganisms to act on pollutants in the upper layer of wastewater. This results in inconsistent purification levels in different layers of wastewater within a given time, affecting the overall efficiency of wastewater biochemical treatment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the technical problem that the purification degree of different layers of sewage in the existing biochemical tank is inconsistent, which affects the overall time of sewage biochemical treatment, and to provide a greywater recycling mechanism for sewage treatment in paper mills.

[0005] The technical solution adopted by this invention to solve its technical problem is: a greywater recycling mechanism for wastewater treatment in paper mills, applied to the middle stage of water treatment, comprising:

[0006] An aerobic tank is located at one end of an anaerobic tank and is used to receive wastewater from the anaerobic tank and to perform biochemical treatment on the wastewater.

[0007] The secondary sedimentation tank is located at one end of the aerobic tank, and the biochemically treated wastewater enters the secondary sedimentation tank through an overflow weir for mud-water separation.

[0008] A recycling tank is located at one end of the secondary sedimentation tank, and the water from the secondary sedimentation tank enters the recycling tank through another overflow weir for the storage of filtered greywater.

[0009] The aerobic tank includes an aeration tank, an aeration pipe installed in the aeration tank, an aerator installed on the aeration tank and connected to the aeration pipe, a plurality of aeration heads installed on the aeration pipe, a plurality of sleeves spirally installed outside the plurality of aeration heads, and packing material installed at the upper end of the plurality of sleeves, wherein...

[0010] The aerator is driven, and after the aeration pipe is ventilated, the air can be discharged through several aeration heads, so that when several sleeves drive several packing materials to spiral upward, biofilm is formed and dirt is removed.

[0011] Furthermore, the aerobic tank also includes spiral blades arranged circumferentially outside the casing, wherein,

[0012] The sleeve can drive the spiral blade to rotate spirally.

[0013] Furthermore, the secondary sedimentation tank includes a tank body adjacent to one end of the aeration tank, a water-retaining slope integrally formed on the side of the tank body, a flocculant storage tank located at the lower end of the water-retaining slope, a discharge port located at the lower end of the flocculant storage tank, a door mechanism located on the discharge port, and a water wheel rotatably mounted on the tank body, wherein...

[0014] Water can be poured through the water-retaining slope to rotate the water wheel, so that when the water wheel circulates and drives the gate mechanism to move, it opens the discharge port to spread material.

[0015] Furthermore, the door mechanism includes a receiving groove disposed at the side end of the discharge port, a door panel inserted through the receiving groove for closing the discharge port, and a bending spring disposed between the door panel and the receiving groove, wherein,

[0016] The water wheel can drive the door panel to move, so that the bending spring is compressed when the door panel opens the discharge port.

[0017] Furthermore, the secondary sedimentation tank also includes a trapezoidal pad block disposed at the bottom end of the tank body, and a corrugated plate disposed on the inclined surface of the trapezoidal pad block;

[0018] Furthermore, the secondary sedimentation tank also includes a cylinder mounted on the tank body and a sludge scraper mounted on the telescopic shaft of the cylinder.

[0019] The lower end face of the scraper blade is in contact with the upper end face of the wave plate.

[0020] Furthermore, the wave plate is shorter than the trapezoidal pad, and the trapezoidal pad forms an oblique channel with the side wall of the pool.

[0021] Furthermore, the recycling tank includes a secondary water tank disposed at one end of the tank body, a baffle plate disposed on the secondary water tank, and a filter cloth disposed between the baffle plate and one end of the secondary water tank, wherein,

[0022] The filter cloth is joined end to end, and the filter cloth is used to filter water.

[0023] Furthermore, the recycling pool also includes two through holes disposed on the medium water tank, a bracket disposed on the medium water tank, a motor disposed on the bracket, a drive roller disposed on the motor, a driven roller rotatably disposed on one of the through holes, and a plurality of inserting pins respectively disposed circumferentially on the drive roller and the driven roller.

[0024] A plurality of the inserting needles are inserted through the mesh of the filter cloth, and the filter cloth is fitted over the drive roller and the driven roller, with one end of the filter cloth protruding from one of the through holes.

[0025] The beneficial effects of this invention are that, compared with the prior art, this invention allows wastewater to be treated sequentially through an aerobic tank, a secondary sedimentation tank, and a recovery tank. During the biochemical treatment process in the aerobic tank, the aerator acts on the casing through the aeration pipe and aeration head, causing the packing material to spirally rise in the wastewater. This allows the packing material to rapidly increase its contact area with microorganisms in an aerobic environment, thus shortening the biofilm formation time. Furthermore, the proliferating microorganisms can spirally act on different depths of the wastewater, ensuring a relatively consistent purification effect at different depths. This effectively overcomes the problem that microorganisms cannot act on the wastewater environment far from the aeration head within a certain time period, thereby improving the overall efficiency of wastewater biochemical treatment. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 is a perspective view of a preferred embodiment of the present invention;

[0028] Figure 2 is a perspective view of the aeration pipe of the present invention;

[0029] Figure 3 is a schematic diagram of the aeration head connecting sleeve structure of the present invention;

[0030] Figure 4 is a schematic diagram of the aeration head separation sleeve structure of the present invention;

[0031] Figure 5 is a partial structural schematic diagram of the secondary sedimentation tank of the present invention;

[0032] Figure 6 is a side view of the internal structure of the door mechanism of the present invention;

[0033] Figure 7 is an enlarged view of point A in Figure 6 of the present invention;

[0034] Figure 8 is a schematic diagram of the filter cloth structure of the present invention;

[0035] Figure 9 is a schematic diagram of the connection between the insert needle and the filter layout part of the present invention.

[0036] In the diagram: 1. Aerobic tank; 11. Aeration tank; 12. Aeration pipe; 13. Aeration head; 14. Casing; 15. Packing material; 16. Spiral blade; 2. Secondary sedimentation tank; 21. Tank body; 22. Water-retaining slope; 23. Flocculant storage tank; 24. Discharge port; 25. Door mechanism; 251. Receiving tank; 252. Door panel; 253. Bending spring; 26. Water wheel; 27. Trapezoidal pad; 28. Corrugated plate; 29. ​​Cylinder; 3. Recycling tank; 31. Greywater tank; 32. Water baffle; 33. Filter cloth; 34. Through hole; 35. Support; 36. Motor; 37. Drive roller; 38. Driven roller; 39. Inserting needle; 4. Sludge scraper. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0038] As shown in Figures 1-9, a greywater recycling mechanism for wastewater treatment in a paper mill, applied to the middle stage of water treatment, includes:

[0039] Aerobic tank 1 is located at one end of the anaerobic tank. The anaerobic tank pre-treats the sewage by fermenting the organic matter in the sewage using anaerobic microorganisms. Then, the pre-treated sewage flows into aerobic tank 1. Aerobic tank 1 maintains high dissolved oxygen by aeration and uses aerobic microorganisms to degrade pollutants. The treatment process will produce a large amount of sludge.

[0040] Secondary sedimentation tank 2 is located at one end of aerobic tank 1, and the biochemically treated wastewater enters secondary sedimentation tank 2 through an overflow weir for mud-water separation.

[0041] The recycling tank 3 is located at one end of the secondary sedimentation tank 2. The water from the secondary sedimentation tank 2 enters the recycling tank 3 through another overflow weir and is used for the storage of filtered greywater. The water from the sludge separation can be recycled in the recycling tank 3.

[0042] The aerobic tank 1 includes an aeration tank 11, aeration pipes 12 arranged in a spiral pattern at various locations within the aeration tank 11, an aerator connected to the aeration pipes 12 and providing oxygen and gas power, several aeration heads 13 connected to the aeration pipes 12, and a one-way valve installed at the outlet of each aeration head 13 to prevent clogging in polluted environments, and several sleeves 14 spirally arranged outside the aeration heads 13. Each aeration head 13 has an external thread, the end of which does not contact the upper end of the aeration head 13. The sleeve 14 spirals to a certain height outside the aeration head 13 and stops, preventing the sleeve 14 from detaching from the aeration head 13 during movement. The packing 15, located on the upper ends of the sleeves 14, is used for microbial attachment and survival. The packing 15 has holes on its sides and bottom to facilitate oxygen contact and biofilm formation for microorganisms. The bottom center of the packing 15 can also be pneumatically stressed. During aeration, the packing 15 moves while simultaneously supplying oxygen through the bottom holes, ensuring unimpeded movement of the packing 15 and oxygen supply during aeration. The aeration pipe 12, after being ventilated, allows air to pass through several aeration tubes. Air is discharged from the nozzle 13, causing the several sleeves 14 to drive the several packing materials 15 to spiral upwards, forming a biofilm and cleaning the wastewater. The aerator can operate continuously or intermittently. In one embodiment, if there is an excess of oxygen, the aerator can operate intermittently or reduce its driving intensity. The sleeves 14 can drive the packing materials 15 to spiral downwards, meeting various needs of biological wastewater treatment. Specifically, in the prior art, wastewater is sequentially treated by passing through an aerobic tank 1, a secondary sedimentation tank 2, and a recovery tank 3. During the biological treatment process of wastewater in the aerobic tank 1, the aerator, through the aeration pipe 12 and the aeration head 13, acts on the sleeves 14, causing the packing materials 15 to spiral upwards in the wastewater. The rising flow allows the packing material 15 to rapidly increase its contact area with microorganisms in an aerobic environment, thus shortening the biofilm formation time. Furthermore, the proliferating microorganisms can spirally act on different depths of the wastewater, ensuring a relatively consistent purification effect at different depths. This effectively overcomes the limitation that microorganisms cannot act on wastewater environments far from the aeration head 13 within a certain timeframe, thereby improving the overall efficiency of wastewater biochemical treatment. The biofilm utilizes the oxygen provided by aeration to degrade pollutants such as COD and ammonia nitrogen in the wastewater, achieving biofilm formation and purification. The shear force generated by the spiral flow can moderately peel away aging biofilms, maintaining membrane activity and preventing clogging.

[0043] Optionally, the aerobic tank 1 also includes a spiral blade 16 arranged in a circular shape outside the sleeve 14. The sleeve 14 can drive the spiral blade 16 to rotate. Specifically, the spiral blade 16 can stir the sewage during the spiral rotation, allowing the sewage and microorganisms to come into full contact, and allowing the oxygen in the aeration process to diffuse and distribute in the sewage tank, thereby achieving the effect of homogenized sewage treatment. Stirring allows water to pass through the packing 15, maintaining the health of biofilm formation.

[0044] Optionally, the secondary sedimentation tank 2 includes a tank body 21 adjacent to one end of the aeration tank 11, a water-retaining slope 22 integrally installed on the side of the tank body 21, a flocculant storage tank 23 located at the lower end of the water-retaining slope 22, a discharge port 24 located at the lower end of the flocculant storage tank 23, a door mechanism 25 located on the discharge port 24, and a water wheel 26 rotatably installed on the tank body 21. Water can be poured through the water-retaining slope 22 to rotate the water wheel 26, so that when the water wheel 26 circulates and pushes the door mechanism 25, it opens the discharge port 24 to distribute the material. After the sewage flows from the aeration tank 11 into the secondary sedimentation tank 2, it is guided by the inclined surface of the water-retaining slope 22 to form a stable water flow, which directly impacts and drives the water wheel 26 to rotate. The larger the water flow, the faster the water wheel 26 rotates, and the higher the pushing frequency of the gate mechanism 25. The amount of material sprinkled at the discharge port 24 is automatically matched with the amount of water entering the tank. The water wheel 26 rotates continuously, cyclically pushing the gate mechanism 25 to open the discharge port 24, realizing periodic and uniform material sprinkling. The material is more evenly distributed in the secondary sedimentation tank 2, which is conducive to the rapid flocculation and sedimentation of suspended solids, and significantly improves the mud-water separation efficiency and the quality of the effluent.

[0045] Optionally, the door mechanism 25 includes a receiving groove 251 disposed on the side of the discharge port 24, a door panel 252 inserted through the receiving groove 251 for closing the discharge port 24, and a bending spring 253 disposed between the door panel 252 and the receiving groove 251. The water wheel 26 can drive the door panel 252 to move, so that the bending spring 253 is compressed when the door panel 252 opens the discharge port 24. Specifically, the receiving groove 251 is used to accommodate the bending spring 253. The door panel 252 is composed of an arc-shaped closing plate and a force-bearing rod. The force-bearing rod is easily moved by the rotating water wheel 26, so that the arc-shaped closing plate moves precisely under the limiting action of the receiving groove 251, which is conducive to the smooth and unobstructed opening and closing of the door panel 252. The bending spring 253 is compressed and stored as the door panel 252 opens, and can release the stored energy without force, which is conducive to the bidirectional automated movement of the door panel 252.

[0046] Optionally, the secondary sedimentation tank 2 also includes a trapezoidal pad 27 at the bottom of the tank body 21, and a corrugated plate 28 on the inclined surface of the trapezoidal pad 27. Specifically, the inclined surface of the trapezoidal pad 27 gradually slopes downward from the direction of the aeration tank 11 toward the direction of the tank body 21, and the inclined surface provides an inclined mounting base for the corrugated plate 28, ensuring that the angle of the corrugated plate 28 is uniform. The corrugated plate 28 has a flow stabilizing effect, preventing the water flow from directly washing up the bottom sludge. The corrugated plate 28 itself has an inclination angle, and the sludge falling on the plate will automatically slide to the bottom of the tank, making it less likely to accumulate. The suspended solids settle faster, and the sedimentation efficiency is significantly improved.

[0047] Optionally, the secondary sedimentation tank 2 also includes a cylinder 29 disposed on the tank body 21, and a scraper 4 disposed on the telescopic shaft of the cylinder 29.

[0048] The lower end face of the scraper 4 is in contact with the upper end face of the corrugated plate 28. Specifically, the scraper 4 can perform scraping action under the drive of the cylinder 29, which avoids the long-term retention of sludge and causes anaerobic floating, and ensures that the suspended solids in the effluent meet the standards. The scraper 4 and the corrugated plate 28 are closely attached, the sludge is thoroughly cleaned, and the service life of the device is extended.

[0049] Optionally, the wave plate 28 is shorter than the trapezoidal pad 27, and the trapezoidal pad 27 and the side wall of the pool body 21 form an inclined channel. The sludge scraper 4 can be driven laterally by the cylinder 29 to keep the sludge in the inclined channel, which is conducive to the sludge sliding down in a directional manner and is not easy to clog.

[0050] Optionally, the recycling tank 3 includes a medium water tank 31 disposed at one end of the tank body 21, a baffle plate 32 disposed on the medium water tank 31, and a filter cloth 33 disposed at one end of the baffle plate 32 and the medium water tank 31. The filter cloth 33 is connected end to end and is used for filtering water. Specifically, a narrow and elongated channel is formed between the baffle plate 32 and the side wall of the medium water tank 31, which is conducive to the stable filtration of the filtered water. The filter cloth 33 can increase the filtration area, filter the effluent depth, reduce the concentration of suspended solids, and improve the quality of the recycled water.

[0051] Optionally, the recycling tank 3 also includes two through holes 34 provided on the medium water tank 31, a bracket 35 provided on the medium water tank 31, a motor 36 provided on the bracket 35, a drive roller 37 provided on the motor 36, a driven roller 38 rotatably provided on one of the through holes 34, and a plurality of inserting pins 39 respectively arranged in a circular pattern on the drive roller 37 and the driven roller 38.

[0052] Several inserting pins 39 are inserted through the mesh of the filter cloth 33, and the filter cloth 33 is sleeved on the outside of the drive roller 37 and the driven roller 38. One end of the filter cloth 33 is passed out through one of the through holes 34. Optionally, the drive roller 37 and the driven roller 38 cooperate to ensure that the filter cloth 33 runs smoothly and has uniform tension. The mesh of the filter cloth 33 is cooperated with by the inserting pins 39 to prevent the filter cloth 33 from slipping or deviating during the filtration process, thereby improving the reliability of the transmission and preventing the filter cloth 33 from loosening or shifting during operation. During the cyclical activity, the pollutants filtered on the surface of the filter cloth 33 can be removed from one of the through holes 34 by the pushing action of the inserting pins 39, thus completing the cycle of filtration and anti-clogging work.

[0053] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A greywater recycling mechanism for wastewater treatment in a paper mill, applied to the intermediate stage of wastewater treatment, characterized in that, include: The aerobic tank (1) is located at one end of the anaerobic tank and is used to receive wastewater from the anaerobic tank and to perform biochemical treatment on the wastewater. Secondary sedimentation tank (2), located at one end of aerobic tank (1), and wastewater that has undergone biochemical treatment enters secondary sedimentation tank (2) through an overflow weir for mud-water separation; recovery tank (3), located at one end of secondary sedimentation tank (2), and water from secondary sedimentation tank (2) enters recovery tank (3) through another overflow weir for storage of filtered greywater; aerobic tank (1) includes aeration tank (11), and aeration pipes (12) are installed in aeration tank (11) and installed in the aeration tank (11). An aerator connected to the aeration pipe (12) on the air tank (11), a plurality of aeration heads (13) set on the aeration pipe (12), a plurality of sleeves (14) spirally set outside the plurality of aeration heads (13), and packing material (15) set on the upper end of the plurality of sleeves (14), wherein, when the aerator is driven, the aeration pipe (12) can be ventilated and discharged through the plurality of aeration heads (13) so that when the plurality of sleeves (14) drive the plurality of packing material (15) to spirally rise, a biofilm is formed and the dirt is removed.

2. The wastewater recycling mechanism for paper mill wastewater treatment as described in claim 1, characterized in that, The aerobic tank (1) also includes a spiral blade (16) arranged in a circular pattern outside the sleeve (14), wherein the sleeve (14) can drive the spiral blade (16) to rotate in a spiral.

3. The wastewater recycling mechanism for paper mill wastewater treatment as described in claim 2, characterized in that, The secondary sedimentation tank (2) includes a tank body (21) adjacent to one end of the aeration tank (11), a water-retaining slope (22) integrally disposed on the side of the tank body (21), a flocculant storage tank (23) disposed at the lower end of the water-retaining slope (22), a discharge port (24) disposed at the lower end of the flocculant storage tank (23), a door mechanism (25) disposed on the discharge port (24), and a water wheel (26) rotatably disposed on the tank body (21). Water can be poured through the water-retaining slope (22) to rotate the water wheel (26), so that when the water wheel (26) circulates and pushes the door mechanism (25) to move, the discharge port (24) is opened to spread material.

4. A wastewater recycling mechanism for paper mill wastewater treatment as described in claim 3, characterized in that, The door mechanism (25) includes a receiving groove (251) disposed on the side of the discharge port (24), a door panel (252) inserted in the receiving groove (251) for closing the discharge port (24), and a bending spring (253) disposed between the door panel (252) and the receiving groove (251). The water wheel (26) can drive the door panel (252) to move so that the bending spring (253) is compressed when the door panel (252) opens the discharge port (24).

5. A wastewater recycling mechanism for paper mill wastewater treatment as described in claim 4, characterized in that, The secondary sedimentation tank (2) also includes a trapezoidal pad (27) at the bottom of the tank body (21) and a wave plate (28) on the inclined surface of the trapezoidal pad (27).

6. A wastewater recycling mechanism for paper mill wastewater treatment as described in claim 5, characterized in that, The secondary sedimentation tank (2) also includes a cylinder (29) installed on the tank body (21) and a scraper (4) installed on the telescopic shaft of the cylinder (29); the lower end face of the scraper (4) is in contact with the upper end face of the wave plate (28).

7. A wastewater recycling mechanism for paper mill wastewater treatment as described in claim 6, characterized in that, The wave plate (28) is shorter than the trapezoidal pad (27), and the trapezoidal pad (27) and the side wall of the pool body (21) form an oblique channel.

8. A wastewater recycling mechanism for paper mill wastewater treatment as described in claim 7, characterized in that, The recycling tank (3) includes a medium water tank (31) at one end of the tank body (21), a baffle plate (32) on the medium water tank (31), and a filter cloth (33) at one end of the baffle plate (32) and the medium water tank (31), wherein the filter cloth (33) is connected end to end and is used for filtering water.

9. A wastewater recycling mechanism for paper mill wastewater treatment as described in claim 8, characterized in that, The recycling tank (3) also includes two through holes (34) on the middle water tank (31), a bracket (35) on the middle water tank (31), a motor (36) on the bracket (35), a drive roller (37) on the motor (36), a driven roller (38) rotatably disposed in one of the through holes (34), and a plurality of inserting needles (39) respectively circumferentially disposed on the drive roller (37) and the driven roller (38); the plurality of inserting needles (39) are inserted into the mesh of the filter cloth (33), and the filter cloth (33) is sleeved on the outside of the drive roller (37) and the driven roller (38), and one end of the filter cloth (33) protrudes from one of the through holes (34).

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