Pulping and papermaking wastewater pretreatment device
By designing a pretreatment device for pulp and paper wastewater, and using equipment such as mechanical bar screens, spiral slag lifters, and aeration devices, impurities and fibers in the papermaking wastewater are separated and recovered, solving the problem of difficult wastewater treatment in the pulp and paper process and achieving effective resource recovery and environmental protection.
Patent Information
- Application Number
- CN202422707466.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-11-07
AI Technical Summary
In existing technologies, the wastewater generated during the pulping and papermaking process contains a large amount of plant fibers and impurities, leading to resource waste, difficulties in sewage treatment, and equipment damage. Furthermore, the discharge of untreated wastewater will cause environmental pollution.
A pretreatment device for pulp and paper wastewater was designed, including an impurity separation unit and a fiber recovery unit. Impurities and fibers in the wastewater are separated and recovered through equipment such as mechanical bar screens, spiral slag lifters, aeration devices, and fiber recovery machines. Different equipment is used to separate light and heavy impurities, and aeration is used to improve the separation effect of light impurities. The waste gas is centrally treated.
It achieves effective removal of impurities from papermaking wastewater, recovers plant fibers, reduces wastewater treatment load, saves resources, and lowers the risk of environmental pollution.
Smart Images
Figure CN223752560U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to papermaking wastewater treatment technical field especially, relates to a kind of pulping papermaking wastewater pretreatment device. BACKGROUND
[0002] At present, most of the paper or paperboard in the world is produced by wet papermaking. The basic principle of wet papermaking is to disperse plant fibers in water medium into pulp suspension through processes such as preparation, fiber separation, screening, sand removal, beating and concentration, and then to remove water from the pulp suspension through processes such as forming, pressing, drying, winding and cutting to produce paper or paperboard.
[0003] Under the existing production technology conditions, a large amount of water is needed to prepare pulp suspension with a concentration of 0.5-5.0wt% from recycled waste paper raw materials with a dryness of 80-90wt%, bamboo and wood chips or other raw materials with a dryness of 40-50wt% in the processes of preparation, fiber separation, screening, sand removal, beating and concentration. In this process, a large amount of pulping wastewater containing plant fibers is generated. In the forming and pressing processes of papermaking, pulp suspension with a concentration of 0.5-5.0wt% is prepared into wet paper web with a dryness of 42wt% or more, and water is removed from the pulp suspension to form a large amount of papermaking wastewater containing plant fibers. At the same time, during the pulping and papermaking production process, regular maintenance is required, and the preparation, fiber separation, screening, sand removal, beating, concentration, forming, pressing and other equipment as well as the storage tanks of pulp, pulping wastewater and papermaking wastewater are emptied and cleaned, which also forms a large amount of maintenance wastewater containing plant fibers. Although most of the pulping wastewater and papermaking wastewater is reused in the pulping and papermaking production process, part of the pulping wastewater and papermaking wastewater, as well as all the maintenance wastewater, must be discharged to the sewage treatment plant for treatment before being reused in the pulping and papermaking process.
[0004] Because the pulping wastewater, papermaking wastewater and maintenance wastewater contain a large amount of plant fibers, and are wrapped with a large amount of plastic, sand and other impurities during discharge through the ditch, if they are not pretreated, the plant fibers are not recovered, and the plastic, sand and other impurities are not removed, it will inevitably cause material waste, difficulty in sewage treatment and equipment damage, etc. UTILITY MODEL CONTENTS
[0005] In view of the problems of removing impurities and recovering plant fibers in the existing technical solutions, the utility model provides a pulping papermaking wastewater pretreatment device.
[0006] The utility model provides the following technical scheme: a pulping papermaking wastewater pretreatment device, comprising:
[0007] The impurity separation unit comprises a first storage pool, the first storage pool is provided with an inlet chute, the inlet chute is provided with a mechanical grille, the first storage pool is provided with a spiral slag extractor, and a travelling crane is further arranged above the first storage pool, and the travelling crane comprises a grab bucket.
[0008] The fiber recovery unit comprises a fiber recovery machine, a second storage pool, a screening machine and a third storage pool, a conveying pump of the first storage pool is connected to an inlet of the fiber recovery machine through a pipeline, an outlet of the fiber recovery machine is connected to the second storage pool, an outlet of the second storage pool is connected to the screening machine, and an undersize outlet of the screening machine is connected to the third storage pool.
[0009] Preferably, the impurity separation unit further comprises an aeration device, the aeration device comprises an aeration pipe arranged at the bottom of the first storage pool, the aeration pipe is sequentially provided with a plurality of aeration nozzles in the axial direction, and the aeration pipe is further connected to an air compressor through an air inlet pipe.
[0010] Preferably, the distance between two adjacent aeration nozzles is 15-25 cm.
[0011] Preferably, the bottom surface of the first storage pool is an inclined surface, and the spiral slag extractor extends to the lowest part of the inclined surface.
[0012] Preferably, the angle between the bottom surface of the first storage pool and the horizontal plane is 15-30°.
[0013] Preferably, the fiber recovery unit further comprises a wastewater pool, the fiber recovery machine is arranged above the second storage pool and the wastewater pool, and a drainage port of the fiber recovery machine is connected to the wastewater pool.
[0014] Preferably, the fiber recovery machine is further covered with a waste gas cover, and the waste gas cover is connected with a fan through a pipeline.
[0015] Preferably, the fiber recovery machine is an inclined net type fiber recovery machine, and the filter screen of the inclined net type fiber recovery machine has a mesh number of 40-60 meshes.
[0016] Preferably, the second storage pool is provided with a conveying pump, and the conveying pump is connected to the screening machine through a pipeline.
[0017] The beneficial effects of the utility model are as follows: plant fibers are recovered after the papermaking wastewater is impurity-removed, the purpose of saving resources and reducing sewage treatment load is achieved, light and heavy impurities in the impurities are separated by using different equipment, the impurity-removing effect is improved, the separation effect on light impurities is improved by adding an aeration device, and the environmental pollution is reduced after waste gas is collected and treated. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a schematic view of an embodiment of the pretreatment device.
[0019] Figure 2 A schematic diagram of an embodiment of the impurity separation unit.
[0020] Figure 3 A schematic diagram of an embodiment of the fiber recovery machine.
[0021] Reference signs: 11, first storage pool; 12, feeding chute; 13, mechanical grid; 14, screw residue lifter; 15, travelling crane; 151, grab bucket; 16, delivery pump; 17, aeration pipe; 21, fiber recovery machine; 22, second storage pool; 23, screening machine; 24, third storage pool; 25, wastewater pool; 26, exhaust hood. DETAILED DESCRIPTION
[0022] The embodiments of the present application will be described in more detail with reference to the drawings and reference signs, so that those skilled in the art can implement the present application after reading the specification. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0023] The present application provides a pulp and papermaking wastewater pretreatment device as shown in Figures 1-3 The present application provides a pulp and papermaking wastewater pretreatment device as shown in
[0024] Please refer to Figure 1 、 2 The impurity separation unit comprises a first storage pool 11, and the first storage pool 11 is provided with a feeding chute 12, and the feeding chute 12 is provided with a mechanical grid 13. The first storage pool 11 is further provided with a travelling crane 15 above, and the travelling crane 15 comprises a grab bucket 151. The papermaking wastewater flows into the first storage pool 11 through the feeding chute 12, and part of the impurities in the papermaking wastewater is preliminarily separated by the mechanical grid 13, and the other part of the impurities enters the first storage pool 11. The operator uses the travelling crane 15 to grab the light impurities floating on the upper layer of the papermaking wastewater through the grab bucket 151 and transfers them to a designated position.
[0025] In order to clean the light impurities suspended in the lower layer of the papermaking wastewater, the impurity separation unit further comprises an aeration device. The aeration device comprises an aeration pipe 17 arranged at the bottom of the first storage pool 11, the aeration pipe 17 is sequentially provided with a plurality of aeration nozzles in the axial direction, and the aeration pipe 17 is connected to an air compressor through an air inlet pipe. The air compressor delivers air to the aeration pipe 17, and forms a large group of micro-bubbles in the papermaking wastewater in the first storage pool 11 by using a plurality of aeration nozzles, the micro-bubbles adhere to the surface of the light impurities, increase the buoyancy of the light impurities, and take the suspended light impurities to the water surface, so as to facilitate the cleaning of the grab bucket 151. The distance between adjacent two aeration nozzles is preferably 15-25 cm.
[0026] The impurity separation unit further comprises a screw residue extractor 14 arranged in the first storage pool 11, one end of the screw residue extractor 14 extends to the bottom of the first storage pool 11, and the other end extends out of the first storage pool 11, for discharging the heavy impurities deposited at the bottom of the first storage pool 11. The bottom surface of the first storage pool 11 is inclined, which is beneficial to the accumulation of the heavy impurities at the lowest part of the inclined surface, and the screw residue extractor 14 extends to the lowest part of the inclined surface, so that the heavy impurities can be discharged better. The included angle α between the bottom surface of the first storage pool 11 and the horizontal plane is preferably 15-30°.
[0027] After being treated by the impurity separation unit, the papermaking wastewater is pumped to the fiber recovery unit by the delivery pump 16. Please refer to Figure 1 、 3 The fiber recovery unit comprises a fiber recovery machine 21, a second storage pool 22, a screening machine 23, a third storage pool 24 and a wastewater pool 25.
[0028] The delivery pump 16 of the first storage pool 11 is connected to the inlet of the fiber recovery machine 21 through a pipeline, the outlet of the fiber recovery machine 21 is connected to the second storage pool 22, and the water outlet of the fiber recovery machine 21 is connected to the wastewater pool 25. The fiber recovery machine 21 is used for separating plant fibers and water, and an inclined screen type fiber recovery machine can be used, the mesh number of the filter screen thereof is preferably 40-60 meshes, and the fiber recovery machine 21 is arranged above the second storage pool 22 and the wastewater pool 25. The mixture of separated plant fibers and water flows to the second storage pool 22 by itself, and the removed wastewater flows to the wastewater pool 25 by itself to wait for treatment.
[0029] The outlet of the second storage pool 22 is connected to the screening machine 23, and the mixture of plant fibers and water is classified. The usable part of the mixture enters the third storage pool 24 from the undersize outlet of the screening machine 23, and the unusable part is removed. Please refer to Figure 1The outlet of the second storage tank 22 can be provided with a conveying pump to pump the material to the inlet of the screening machine 23 through a pipeline; in other embodiments, the material in the second storage tank 22 can also be caused to flow to the screening machine 23 by setting a height difference. The screening machine 23 can be a circular double-layer vibrating screen, the first layer of screen mesh being 60 mesh and the second layer of screen mesh being 100 mesh. The third storage tank 24 sends the recycled plant fibers back to the papermaking production line through a conveying pump.
[0030] The fiber recycling machine 21 is also covered with a waste gas cover 26, which is connected with a fan through a pipeline. The fiber recycling machine 21 generates waste gas during operation, including water vapor generated in the separation and tumbling process of the waste water into the fiber recycling machine 21, and the putrid gas generated by bacteria phagocytizing nutrients in the waste water. The fan draws away the above-mentioned waste gas through the top exhaust port of the waste gas cover 26 and sends it to a foul gas treatment system for further treatment, preventing environmental pollution.
[0031] The above is one or more embodiments of the present application, which is described in more detail and in more detail, but should not be construed as limiting the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.
Claims
1. A pulp and paper mill wastewater pretreatment apparatus, characterized by, The application relates to a waste fiber recovery device. The waste fiber recovery device comprises a foreign matter separation unit and a fiber recovery unit. The foreign matter separation unit comprises a first storage pool, a spiral slag lifter, a mechanical grate, an aeration device and a travelling crane.
2. A device for the pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The fiber recovery unit comprises a fiber recovery machine, a second storage pool, a screening machine and a third storage pool.
3. A device for the pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The first storage pool is connected to the fiber recovery machine through a pipeline.
4. A device for the pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The fiber recovery machine is connected to the second storage pool through a pipeline.
5. A device for the pretreatment of pulp and papermaking wastewater according to claim 4, characterized in that The second storage pool is connected to the screening machine through a pipeline.
6. A device for the pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The screening machine is connected to the third storage pool through a pipeline.
7. A device for the pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The aeration device comprises an aeration pipe arranged at the bottom of the first storage pool.
8. A device for the pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The aeration pipe is provided with a plurality of aeration nozzles in the axial direction.
9. A device for pretreatment of pulp and papermaking wastewater according to claim 1, characterized in that The aeration pipe is connected to an air compressor through an air inlet pipe. The distance between two adjacent aeration nozzles is 15-25 cm. The bottom surface of the first storage pool is inclined. The spiral slag lifter extends to the lowest part of the inclined bottom surface. The angle between the bottom surface of the first storage pool and the horizontal plane is 15-30 degrees. The fiber recovery unit further comprises a waste water pool. The fiber recovery machine is arranged above the second storage pool and the waste water pool. The water outlet of the fiber recovery machine is connected to the waste water pool. The fiber recovery machine is covered with an exhaust hood. The exhaust hood is connected to a fan through a pipeline. The fiber recovery machine is an inclined screen type fiber recovery machine. The mesh number of the filter screen of the inclined screen type fiber recovery machine is 40-60. The second storage pool is provided with a conveying pump. The conveying pump is connected to the screening machine through a pipeline.