A pulp waste water treatment device for a fruit bag paper production line

Abstract

The present application relates to paper pulp wastewater treatment technical field, disclose a kind of paper pulp wastewater treatment device for fruit bag paper production line, comprising: pretreatment unit, paper pulp fiber recovery unit, biochemical treatment unit and depth treatment unit, pretreatment unit is used to remove impurities in wastewater, and adjust the pH value in wastewater, paper pulp fiber recovery unit is located below pretreatment unit, paper pulp fiber recovery unit is used to recycle paper pulp fiber, and the recovered paper pulp fiber is treated, biochemical treatment unit is used to degrade refractory organic matter, depth treatment unit is used to degrade refractory organic matter and water body chromaticity after biochemical treatment, and waste water is purified, paper pulp fiber recovery unit, biochemical treatment unit and depth treatment unit are sequentially communicated by conveying pipeline between them.The present application solves the problem that traditional process cannot effectively separate impurities and paper pulp fiber, the proportion of refractory organic matter in wastewater is high, the biodegradability is low, and the effluent chromaticity is difficult to meet the standard.

Description

Technical Field

[0001] This invention relates to the field of pulp wastewater treatment technology, and in particular to a pulp wastewater treatment device for a fruit bag paper production line. Background Technology

[0002] Fruit bagging paper is a special type of paper used for bagging fruits. Its production process generates a large amount of pulp wastewater. This type of wastewater is a typical high-concentration, difficult-to-degrade organic wastewater, containing a large amount of pulp fiber, lignin, hemicellulose, fillers, and a small amount of toxic substances. The wastewater is characterized by high chemical oxygen demand (COD), high suspended solids (SS) content, dark color, and poor biodegradability. If discharged directly, it will seriously pollute the aquatic ecological environment, destroy the habitat of aquatic organisms, and waste resources such as pulp fiber.

[0003] Currently, pulp wastewater treatment in fruit bag paper production lines mostly adopts a combination of traditional physicochemical pretreatment and biological treatment processes. However, impurities are mixed with pulp fibers and cannot be effectively separated. Furthermore, the wastewater contains a high proportion of recalcitrant organic matter (such as lignin derivatives) and has low biodegradability (B / C ratio), which inhibits microbial activity, resulting in low efficiency of the biological treatment unit. Fluctuations in water quality can easily lead to sludge bulking, causing excessive suspended solids (SS) in the effluent and system malfunction. In addition, traditional biological methods have limited ability to remove color-dissolving substances in water, making it difficult to consistently meet the effluent color standards. Summary of the Invention

[0004] This application discloses a pulp wastewater treatment device for a fruit bag paper production line, which solves the problems in the prior art where impurities are mixed with pulp fibers and cannot be effectively separated, and the wastewater has a high proportion of recalcitrant organic matter (such as lignin derivatives) and low biodegradability (B / C ratio), which leads to inhibited microbial activity, low efficiency of the biochemical treatment unit, and limited ability of traditional biochemical methods to remove color-developing substances dissolved in water, making it difficult to stably meet the effluent color standards.

[0005] To solve the above problems, the present invention adopts the following technical solution: A pulp wastewater treatment device for a fruit bagging paper production line includes: The pretreatment unit is used to remove impurities from the wastewater and adjust the pH value of the wastewater. The pulp fiber recycling unit is located below the pretreatment unit. The pulp fiber recycling unit is used to recycle pulp fibers and dewater the recycled pulp fibers. The biochemical treatment unit is used to degrade recalcitrant organic matter. The advanced treatment unit is used to degrade the recalcitrant organic matter and water color remaining after biochemical treatment, and to purify the wastewater. The pulp fiber recycling unit, biochemical treatment unit, and deep treatment unit are connected in sequence via conveying pipelines.

[0006] The technical solution adopted in this invention can achieve the following beneficial effects: This invention employs a multi-stage treatment process: pretreatment, pulp fiber recovery, biochemical treatment, and advanced treatment. The pretreatment unit removes impurities and adjusts the pH value, effectively separating impurities from pulp fibers, laying the foundation for subsequent treatment. The pulp fiber recovery unit recovers pulp fibers, which, after dewatering, can be reused in fruit bag production, reducing resource waste and lowering raw material costs. The biochemical treatment unit effectively degrades recalcitrant organic matter in the wastewater, improving its biodegradability. The advanced treatment unit further degrades residual recalcitrant organic matter and water color after biochemical treatment, purifying the wastewater to ensure that the chemical oxygen demand (COD), suspended solids (SS), color, and toxic substance content of the treated wastewater all meet national emission standards and the requirements for reuse in fruit bag production. This solves the problems of traditional processes, such as ineffective separation of impurities and pulp fibers, high proportion of recalcitrant organic matter in wastewater, low biodegradability, large water quality fluctuations, residual toxic substances, and difficulty in meeting effluent color standards. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0008] Figure 1 This is a schematic front view of the overall structure disclosed in some embodiments of this application; Figure 2 This is a front cross-sectional view of the biochemical processing unit, deep processing unit, and reuse storage unit disclosed in some embodiments of this application; Figure 3 This is a front cross-sectional view of the preprocessing unit disclosed in some embodiments of this application; Figure 4 yes Figure 3 Enlarged structural diagram at point A; Figure 5 yes Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the right cross-sectional structure of the preprocessing unit disclosed in some embodiments of this application; Figure 7 This is a front cross-sectional view of a pulp fiber recycling unit disclosed in some embodiments of this application; Figure 8 yes Figure 7Enlarged structural diagram at point C; Figure 9 This is a right-side cross-sectional view of a pulp fiber recycling unit disclosed in some embodiments of this application.

[0009] In the picture: 100 - Pretreatment unit; 110 - Pretreatment box; 120 - Impurity filtration mechanism; 121 - Coarse screen; 122 - Fine screen; 123 - First vibration assembly; 1231 - First rotating shaft; 1232 - First cam; 1233 - Second driving component; 124 - First reset assembly; 1241 - Slide groove; 1242 - Telescopic rod; 1243 - Clamping block; 1244 - Second elastic element; 130 - pH adjustment mechanism; 131 - pH reagent feed pipe; 132 - First stirring assembly; 1321 - First Stirring shaft; 1322-First stirring rod; 133-Float sensing assembly; 1331-Slide rail; 1332-Float plate; 1333-Sensor; 140-First cleaning mechanism; 141-First driving component; 142-Threaded rod; 143-Threaded block; 144-Push plate; 145-Connecting rod; 146-Moving groove; 147-Moving plate; 148-First elastic element; 150-First water inlet pipe; 160-First water outlet pipe; 170-Impurity discharge pipe; 180-Guide plate; 190-First support leg; 200-Pulp fiber recycling unit; 210-Pulp fiber recycling box; 220-Squeeze water box; 221-Guide plate; 222-Return port; 223-First scraper; 230-Fiber filtration mechanism; 231-Fiber filter screen; 232-Second vibration assembly; 2321-Second rotating shaft; 2322-Second cam; 2323-Third drive component; 233-Second reset assembly; 240-Second cleaning mechanism; 250-Conveying and pressing mechanism; 251-Conveying assembly; 252-Pressing assembly; 2521-Pressing roller; 2522-Second scraper; 260-Second water inlet pipe; 270-Second water outlet pipe; 280-Pulp fiber discharge pipe; 290-Second support leg; 300 - Biochemical treatment unit; 310 - Anaerobic reactor; 311 - Anaerobic microbial carrier; 320 - Aerobic reactor; 321 - Aeration assembly; 330 - Sedimentation tank; 331 - Sludge discharge pipe; 400 - Deep treatment unit; 410 - Fenton oxidation tank; 411 - Second stirring assembly; 420 - Ultrafiltration tank; 421 - Ultrafiltration membrane; 422 - Backwashing assembly; 500 - Reusable storage unit; 510 - Water storage tank; 600-Drive pump. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below.

[0011] The inventive concept of this application is described here: Currently, the treatment of pulp wastewater from fruit bagging paper production lines mostly adopts a traditional combination of physicochemical pretreatment and biological treatment. However, this approach has several limitations in practical applications: First, the treatment efficiency is unstable. The wastewater contains a high proportion of recalcitrant organic matter (such as lignin derivatives) and has low biodegradability (B / C ratio), which inhibits microbial activity, resulting in low efficiency of the biological treatment unit. Fluctuations in water quality can easily lead to sludge bulking, causing excessive suspended solids (SS) in the effluent and system malfunction. Furthermore, traditional biological methods have limited ability to remove color-developing substances dissolved in water, making it difficult to consistently meet effluent color standards. Second, the pulp fiber recovery efficiency is low. Traditional treatment methods often use simple filtration or sedimentation to remove paper fibers. Pulp fibers are prone to clogging the filter media, requiring frequent cleaning. Furthermore, the recovered pulp fibers have low purity and high moisture content, making them difficult to reuse in production. Most pulp fibers are discharged with sludge or incinerated, and water resources in wastewater cannot be effectively recycled, resulting in resource waste and environmental burden. Thirdly, the treatment process is cumbersome. The pretreatment unit lacks an effective impurity interception and cleaning mechanism, and the subsequent flocculation and sedimentation units need to treat a large amount of suspended solids mixed with pulp fibers and impurities, leading to high reagent consumption and high treatment costs. At the same time, fine pulp fibers and colloids easily adhere to the surface of the filter media, causing filter media clogging, affecting the continuous operation of the treatment system, and increasing maintenance workload.

[0012] Based on this, the inventors provide a pulp wastewater treatment device for a fruit bag paper production line. This device boasts high treatment efficiency, reduces the proportion of recalcitrant organic matter in the wastewater, exhibits high biodegradability, high efficiency of the biochemical treatment unit, minimal water quality fluctuations, and ensures that suspended solids (SS) and effluent color meet standards. Furthermore, it features high pulp fiber recovery efficiency, effectively separating impurities from pulp fibers. The recovered pulp fibers are of high purity and low moisture content, allowing for reuse in fruit bag paper production. It also effectively recycles water resources, reducing resource waste. The device consumes chemicals rationally, resulting in low treatment costs. Additionally, it allows for timely cleaning of the filter media surface, preventing clogging that could affect the continuous operation of the treatment system and increase maintenance workload.

[0013] The following is in conjunction with the appendix Figures 1 to 9 This application provides a detailed description of a pulp wastewater treatment device for a fruit bag paper production line through specific embodiments and application scenarios.

[0014] Reference Figure 1 and Figure 2 A pulp wastewater treatment device for a fruit bag paper production line includes: a pretreatment unit 100, a pulp fiber recovery unit 200, a biochemical treatment unit 300, and a deep treatment unit 400. The pretreatment unit 100 is used to remove impurities from the wastewater and adjust the pH value of the wastewater. Specifically, the pretreatment unit 100 removes large particulate impurities (such as shredded paper and wood chips) and fine solid impurities (such as fine pulp fiber fragments, filler debris, tiny shredded paper, wood chips, raw material dust, and residual particles of production aids) from the wastewater, effectively separating the impurities from the pulp fibers and laying the foundation for subsequent pulp fiber recycling and biochemical treatment. The pH value of the wastewater is adjusted to a suitable range for subsequent treatment (6.5-7.5). For the pulp fiber recycling unit 200, the neutral pH environment prevents acidic or alkaline wastewater from corroding the metal components of the pulp fiber recycling unit 200, while not damaging the structure of the pulp fibers, ensuring high purity and good flexibility of the recycled pulp fibers. For the biochemical treatment unit 300, it prevents the pH of the wastewater from fluctuating again after fiber recycling, inhibits microbial activity, ensures stable and efficient subsequent biochemical treatment, and solves the problem of poor biodegradability of pulp wastewater.

[0015] The pulp fiber recycling unit 200 is located below the pretreatment unit 100. The pulp fiber recycling unit 200 is used to recycle pulp fibers and dewater the recycled pulp fibers. Specifically, pulp fibers are recycled through pulp fiber recycling unit 200. The recycled pulp fibers can be reused in the production of fruit bag paper after dehydration treatment, which not only reduces resource waste but also lowers the cost of raw materials, in line with the environmental protection concept of resource utilization. The wastewater after fiber recycling is automatically transported to biochemical treatment unit 300 for organic matter degradation.

[0016] The biochemical treatment unit 300 is used to degrade recalcitrant organic matter; Specifically, the biochemical treatment unit 300 effectively degrades recalcitrant macromolecular organic matter (such as lignin and hemicellulose), small molecule organic matter, and some recalcitrant organic matter (such as lignin-related derivatives) in wastewater, improving the biodegradability of wastewater, reducing COD and toxic substances (such as weakly toxic pulping aids remaining from fruit bag paper production, trace amounts of bactericides, and toxic small molecule phenolic substances produced by lignin degradation), ensuring more thorough removal of organic matter and laying the foundation for subsequent deep treatment.

[0017] The advanced treatment unit 400 is used to degrade the recalcitrant organic matter and water color remaining after biochemical treatment, and to purify the wastewater. Specifically, the deep treatment unit 400 further degrades the residual recalcitrant organic matter and water color after biochemical treatment, while completely decomposing residual trace toxic substances and purifying the wastewater. This process removes fine suspended solids (such as fine pulp fiber fragments, lignin particles, filler debris, etc.), colloidal particles (such as lignin derivative colloids, protein colloids, residual colloids of incompletely degraded toxic substances, colloids formed by additives added during pulp production, etc.), and residual microorganisms (referring to a small number of microorganisms that were not completely removed after biochemical treatment, as well as a small number of miscellaneous bacteria originally present in the wastewater). This improves the cleanliness of the effluent and ensures that the chemical oxygen demand (COD), suspended solids (SS), color, and toxic substance content of the treated wastewater all meet national emission standards and the requirements for reuse in fruit bag paper production.

[0018] The pulp fiber recycling unit 200, the biochemical treatment unit 300, and the deep treatment unit 400 are connected in sequence through conveying pipelines.

[0019] In this embodiment, the pulp wastewater treatment device further includes a reuse storage unit 500, which is connected to the deep treatment unit 400 via a conveying pipeline.

[0020] Specifically, drive pumps 600 and solenoid valves are installed on the conveying pipelines between the pulp fiber recycling unit 200, the biochemical treatment unit 300, the deep treatment unit 400, and the reuse storage unit 500. Each pump and valve is linked with the controller to achieve orderly and controllable flow of wastewater between the units, with no leakage or secondary pollution throughout the process. The flow rate and start / stop timing can be automatically adjusted according to the operating conditions and water quality indicators of each unit. The controller controls the entire device to execute actions according to a predetermined program, processes various sensors and signal sources, and outputs corresponding program instructions. Each unit (referring to...) The pretreatment unit 100, pulp fiber recycling unit 200, biochemical treatment unit 300, deep treatment unit 400, and reuse storage unit 500 have a reasonable structural design and adopt intelligent linkage control. They strictly control the timing of wastewater flow according to water quality and liquid level indicators, and can automatically adjust operating parameters according to changes in water quality to ensure that each unit is always in the best working condition. The system's operational stability is greatly improved. At the same time, the consumption of reagents is reasonable, and sludge and recycled fibers can be utilized as resources, further reducing treatment costs and the risk of secondary pollution, which is in line with the environmental protection concept of reduction and harmlessness.

[0021] Reference Figure 1 and Figure 2 In this embodiment, the biochemical treatment unit 300 includes an anaerobic reaction tank 310, an aerobic reaction tank 320 and a sedimentation tank 330 connected in sequence. Anaerobic reactor 310 is equipped with anaerobic bacteria carrier 311, aerobic reactor 320 is equipped with aeration component 321, and sludge discharge pipe 331 is installed at the bottom of anaerobic reactor 310, aerobic reactor 320 and sedimentation tank 330. Specifically, the anaerobic reactor 310, aerobic reactor 320, and sedimentation tank 330 are connected sequentially via conveying pipes, each equipped with a drive pump 600 and a solenoid valve. The anaerobic microbial carrier 311 is a honeycomb ceramic carrier on which acclimatized anaerobic microbial communities are fixed. The top of the aerobic reactor 320 is equipped with a high-efficiency degradation agent inlet (not shown in the figure) for adding acclimatized high-efficiency degradation agents to enhance the degradation capacity of organic pollutants. The aeration component 321 includes an aeration disc and an air compressor (not shown in the figure). The aeration disc is evenly laid on the bottom of the tank to provide sufficient oxygen for the aerobic microorganisms. The air compressor is connected to the aeration disc. Its specific structure and working principle are common knowledge and will not be described in detail here. The anaerobic reactor 310 is in operation. Anaerobic sludge is generated during the process. Aged and deactivated anaerobic sludge is periodically discharged through sludge discharge pipe 331 to prevent sludge accumulation from affecting the activity of the microbial community. Microorganisms in the aerobic reaction tank 320 have vigorous metabolism and reproduction, which will continuously produce aerobic activated sludge. This aerobic activated sludge is also periodically discharged through sludge discharge pipe 331. The sludge discharge pipes 331 of the anaerobic reaction tank 310, the aerobic reaction tank 320, and the sedimentation tank 330 are all connected to a sludge treatment tank (not shown in the figure) to realize the centralized collection and treatment of various types of sludge in the biological system. The sludge treatment tank can be equipped with sludge dewatering components (such as plate and frame filter presses) and disinfection components (such as ultraviolet disinfection, chlorine dioxide disinfection devices, etc.). The dewatered sludge can be used as raw material for organic fertilizer, realizing the resource utilization of sludge and avoiding secondary pollution.

[0022] Anaerobic reactor 310 is used to degrade large molecular recalcitrant organic matter in wastewater; Specifically, the wastewater stays in the anaerobic reactor 310 for 12-24 hours, degrading the large-molecule recalcitrant organic matter in the wastewater and converting it into small-molecule organic matter, thereby improving the biodegradability of the wastewater and reducing the COD and toxic substances in the wastewater.

[0023] The aerobic reaction tank 320 is used to degrade small molecule organic matter and some residual recalcitrant organic matter in wastewater; Specifically, the wastewater remains in the aerobic reaction tank 320 for 8-16 hours, which degrades small-molecule organic matter and some recalcitrant organic matter in the wastewater, improves the biodegradability of the wastewater, and reduces the COD and toxic substances in the wastewater.

[0024] Sedimentation tank 330 is used to settle the mixed activated sludge that flows out with the wastewater after biological treatment, thus achieving sludge-water separation.

[0025] Specifically, the wastewater stays in the sedimentation tank 330 for 2-4 hours. After the supernatant is clear and the sludge has completely settled to the bottom of the tank, the supernatant can be sent to the deep treatment unit 400 by the drive pump 600.

[0026] Reference Figure 1 and Figure 2 In this embodiment, the deep processing unit 400 includes a Fenton oxidation tank 410 and an ultrafiltration tank 420 connected in sequence. The Fenton oxidation tank 410 is equipped with a second stirring component 411, and the ultrafiltration tank 420 is equipped with an ultrafiltration membrane 421 and a backwashing component 422. Specifically, the Fenton oxidation tank 410 and the ultrafiltration tank 420 are connected by a conveying pipeline, and each conveying pipeline is equipped with a drive pump 600 and a solenoid valve. The top of the Fenton oxidation tank 410 is equipped with a ferrous ion inlet (not shown) and a hydrogen peroxide inlet (not shown). Both inlets are sealed to corresponding reagent storage tanks (not shown). The dosage of Fenton reagent is controlled by a precise metering pump. Utilizing the strong oxidizing properties of the hydroxyl radicals generated in the reaction, the residual recalcitrant organic matter and water color after biochemical treatment are efficiently degraded. The second stirring assembly 411 consists of a support frame, a servo motor, a second stirring shaft, and a second stirring rod. The servo motor is mounted on the support frame and drives the second stirring shaft to rotate. The second stirring rod rotates to ensure that Fenton's reagent and wastewater are fully mixed and react completely, avoiding incomplete local reactions that could affect the treatment effect. The ultrafiltration membrane 421 is vertically and detachably installed in the ultrafiltration tank 420. The ultrafiltration membrane 421 is a hollow fiber ultrafiltration membrane with a pore size adapted to the wastewater purification requirements. It is used to intercept fine suspended solids, colloidal particles and residual microorganisms in the wastewater to improve the cleanliness of the effluent. The backwashing component 422 includes a backwashing pipe and a backwashing pump (not shown in the figure). The backwashing pipe and the backwashing pump are connected to perform pulse backwashing on the ultrafiltration membrane 421 regularly to prevent membrane pore blockage, extend the service life of the ultrafiltration membrane 421, ensure the continuous and stable operation of the deep treatment unit 400, and reduce the workload of manual cleaning and maintenance.

[0027] Fenton oxidation tank 410 is used to degrade the recalcitrant organic matter and water color remaining after biochemical treatment. At the same time, the strong oxidizing hydroxyl radicals generated by Fenton reagent can completely oxidize and decompose the residual trace toxic substances, converting them into non-toxic small molecules. Specifically, the wastewater remains in the Fenton oxidation tank 410 for 1-2 hours.

[0028] The 420 ultrafiltration tank is used to purify wastewater and intercept residual colloids of toxic substances that have not been fully degraded, ensuring that the effluent is non-toxic.

[0029] Reference Figure 1 and Figure 2In this embodiment, the reuse storage unit 500 includes a water storage tank 510, which is equipped with a water quality detection sensor. The outlet of the water storage tank 510 is connected to the water supply end of the fruit bag paper production line through a return pipe.

[0030] Specifically, the water quality detection sensors include a COD sensor, an SS sensor, and a color sensor, which are electrically connected to the controller. The controller is electrically connected to a valve on the return pipeline, which connects the water storage tank 510 to the water supply end of the fruit bag paper production line. When the water quality meets the standards, the valve opens, and the wastewater is reused in production. It can also be used for equipment cleaning, site flushing, and cooling water. When the water quality does not meet the standards, the valve closes, and the wastewater is returned to the deep treatment unit 400 for reprocessing to ensure that the reused wastewater meets production requirements.

[0031] Reference Figure 3 In this embodiment, the pretreatment unit 100 includes a pretreatment box 110, an impurity filtration mechanism 120, a pH adjustment mechanism 130, and a first cleaning mechanism 140. The pretreatment box 110 is provided with an impurity filtration mechanism 120 and a pH adjustment mechanism 130 arranged from top to bottom. The pretreatment box 110 is also provided with a first cleaning mechanism 140 corresponding to the impurity filtration mechanism 120. Specifically, the pretreatment box 110 is located above the pulp fiber recycling unit 200.

[0032] Reference Figure 3 The pretreatment box 110 is equipped with a first water inlet pipe 150 at the top, which is connected to the wastewater discharge outlet of the fruit bag paper production line. The lower part of the pretreatment box 110 is funnel-shaped to facilitate the discharge of wastewater. The bottom of the pretreatment box 110 is equipped with a first water outlet pipe 160, which is connected to the pulp fiber recycling unit 200. Both the first water inlet pipe 150 and the first water outlet pipe 160 are equipped with solenoid valves, which are electrically connected to the controller. An impurity outlet corresponding to the impurity filtration mechanism 120 is opened on one side of the pretreatment box 110. An impurity discharge pipe 170 is installed on the pretreatment box 110 at the impurity outlet to facilitate the discharge of impurities intercepted by the impurity filtration mechanism 120. First support legs 190 are installed on both sides of the lower part of the pretreatment box 110 to support the pretreatment box 110. Preferably, there are four first support legs 190, which are distributed in a rectangular array at the lower part of the pretreatment box 110.

[0033] The impurity filtration mechanism 120 is used to remove impurities from wastewater and effectively separate impurities from pulp fibers, laying the foundation for subsequent pulp fiber recycling and biochemical treatment. pH adjustment mechanism 130 is used to adjust the pH value in wastewater to 6.5-7.5; The first cleaning mechanism 140 is used to clean the impurities trapped by the impurity filtration mechanism 120, so that the impurities are discharged from the impurity discharge pipe 170.

[0034] Reference Figures 3 to 6 In this embodiment, the impurity filtration mechanism 120 includes a coarse screen 121, a fine screen 122, a first vibration component 123, and a first reset component 124. Both the coarse screen 121 and the fine screen 122 are slidably disposed in the pretreatment box 110, with the coarse screen 121 located above the fine screen 122. The grid spacing of the coarse screen 121 is 2-5mm, and the grid spacing of the fine screen 122 is 0.5-1mm. A first vibration component 123 is disposed below both the coarse screen 121 and the fine screen 122, and a first reset component 124 is disposed on the top of both the coarse screen 121 and the fine screen 122. A first cleaning mechanism 140 is disposed corresponding to the coarse screen 121 and the fine screen 122. Specifically, both the coarse screen 121 and the fine screen 122 are horizontally slidably disposed within the pretreatment tank 110; the coarse screen 121 removes large particulate impurities from the wastewater; the fine screen 122 removes small solid impurities from the wastewater; a maintenance door is rotatably provided on one side of the upper part of the pretreatment tank 110, facilitating the removal of the coarse screen 121 and the fine screen 122 for cleaning and replacement; in this embodiment, each of the coarse screen 121 and the fine screen 122 corresponds to one set of first vibration components 123 and four sets of first reset components 124, the four sets of first reset components 124 being distributed at the top four corners of the coarse screen 121 or the fine screen 122, and the two sets of first vibration components 123 can be connected by a synchronous belt assembly; two sets of first cleaning mechanisms 140 are provided, corresponding to the coarse screen 121 and the fine screen 122 respectively, and the two sets of first cleaning mechanisms 140 can be connected by a synchronous belt assembly.

[0035] Reference Figure 3 In this embodiment, the pulp fiber recycling unit 200 recycles pulp fibers that can be reused in production. These pulp fibers typically have a diameter greater than 1 mm and are not rigid solid particles, but rather slender fibers (or fiber bundles) with a certain degree of flexibility. The fine grid 122 mainly intercepts small solid impurities. Although the grid spacing of the fine grid 122 is smaller than the diameter of the pulp fibers, under the impact of the water flow, the flexible pulp fibers can bend and deform slightly with the direction of the water flow and pass through the gaps between the grid bars, while rigid small impurities are blocked by the grid bars. An inclined guide plate 180 is provided on the inner wall of the pretreatment tank 110 between the coarse grid 121 and the fine grid 122. The inclination direction of the guide plate 180 is opposite to the direction of the impurity discharge pipe 170. The guide plate 180 concentrates and guides the wastewater to the fine grid 122, increasing the impact force of the water flow.

[0036] Reference Figure 3 , Figure 4 and Figure 6The first vibration assembly 123 includes a first rotating shaft 1231, a first cam 1232, and a second driving member 1233. Two first rotating shafts 1231 are provided, rotatably mounted inside the pretreatment box 110, and positioned on either side below the coarse screen 121 or the fine screen 122. One end of each first rotating shaft 1231 is near the inspection door, and this end is rotatably connected to a support block. The support block is connected to the inner wall of the pretreatment box 110. First... Cam 1232, the first cam 1232 can abut against the bottom of coarse screen 121 or fine screen 122, one end of one of the first rotating shafts 1231 extends out of the pretreatment box 110 and connects to the output end of the second drive unit 1233, the second drive unit 1233 can be a servo motor, its specific structure and working principle are common knowledge, so they will not be described in detail here; the second drive unit 1233 is mounted on a horizontal plate, one end of the horizontal plate is connected to the pretreatment box 110; the two first rotating shafts 1231 can be connected by a synchronous belt assembly; two sets of first vibration components 12 3 corresponds to the coarse screen 121 and the fine screen 122 respectively. The first rotating shaft 1231 of one set of first vibration components 123, connected to the second drive component 1233, can be connected to the first rotating shaft 1231 of another set of first vibration components 123 via a synchronous belt assembly. This allows one second drive component 1233 to synchronously drive four first rotating shafts 1231, ensuring consistent vibration rhythm for the coarse screen 121 and the fine screen 122. This avoids impurity accumulation due to insufficient vibration, improves the ease of operation, and reduces the need for manual control. Cost; an outer shell (not shown) can be installed outside the first rotating shaft 1231 extending out of the pretreatment box 110 to protect the second drive component 1233 and the corresponding synchronous belt assembly; preferably, the large circle of the first cam 1232 is a certain distance from the bottom of the coarse grid 121 or the fine grid 122 to facilitate the replacement of the coarse grid 121 and the fine grid 122; the small circle of the first cam 1232 will abut against the bottom of the coarse grid 121 or the fine grid 122 during the rising and falling process to realize the vibration of the coarse grid 121 and the fine grid 122.

[0037] Reference Figure 3 and Figure 5The first reset assembly 124 includes a slide groove 1241, a telescopic rod 1242, a clamping block 1243, and a second elastic element 1244. The slide groove 1241 is formed on the inner wall of the pretreatment box 110. In this embodiment, the coarse grid 121 and the fine grid 122 correspond to four slide grooves 1241 respectively, and the four slide grooves 1241 are distributed at the four corners of the coarse grid 121 or the fine grid 122. A telescopic rod 1242 is vertically arranged in the slide groove 1241. The top of the telescopic rod 1242 is connected to the top of the slide groove 1241, and the bottom of the telescopic rod 1242 is connected to the clamping block 1243. The bottom of the clamping block 1243 contacts the top of the coarse grid 121 or the fine grid 122. A second elastic element 1244 is sleeved on the outer surface of the telescopic rod 1242 between the top of the slide groove 1241 and the top of the clamping block 1243. The second elastic element 1244 is preferably a spring. The second elastic element 1244 can buffer the upward impact force of the first cam 1232 on the coarse screen 121 or fine screen 122, avoid hard contact between the clamping block 1243 and the coarse screen 121 or fine screen 122, reduce wear on the top of the coarse screen 121 and fine screen 122, extend the service life of the components, and quickly push the clamping block 1243 to reset by its own elastic force, thereby driving the coarse screen 121 or fine screen 122 back to the initial position, further ensuring the positional accuracy and structural integrity of the coarse screen 121 and fine screen 122; the four corners of the coarse screen 121 and fine screen 122 are placed in the slide groove 1241. When the coarse screen 121 and fine screen 122 are placed, the slide groove 1241 can play a guiding role, and the top of the coarse screen 121 and fine screen 122 is flush with the bottom of the impurity discharge port, which facilitates the discharge of impurities.

[0038] Preferably, the lower part of the clamping block 1243 is inclined on the side near the inspection door of the pretreatment box 110, so that when the coarse grid 121 and the fine grid 122 are inserted, the clamping block 1243 is lifted up, and the second elastic member 1244 keeps the clamping block 1243 in contact with the coarse grid 121 or the fine grid 122, ensuring the replacement of the coarse grid 121 and the fine grid 122.

[0039] Reference Figure 4 and Figure 5The first cleaning mechanism 140 includes a first driving component 141, a threaded rod 142, a threaded block 143, and a push plate 144. The first driving component 141 is located outside the pretreatment box 110 and is horizontally positioned at the end of the pretreatment box 110 away from the impurity discharge pipe 170. The first driving component 141 can be a servo motor, and its specific structure and working principle are common knowledge, so they will not be described in detail here. The output end of the first driving component 141 is connected to the threaded rod 142, and the other end of the threaded rod 142 is connected to... The pretreatment box 110 is rotatably connected to one end away from the impurity discharge pipe 170. A threaded block 143 is threadedly connected to the threaded rod 142. A push plate 144 is slidably disposed above the coarse screen 121 or the fine screen 122. The push plate 144 is connected to the threaded block 143. The push plate 144 scrapes and removes impurities on the coarse screen 121 or the fine screen 122, keeping the coarse screen 121 and the fine screen 122 unobstructed, ensuring that wastewater passes smoothly through the coarse screen 121 and the fine screen 122, and achieving continuous and stable filtration.

[0040] Specifically, the first cleaning mechanism 140 is externally protected by a housing. The first driving component 141 is installed inside the housing. A horizontally arranged connecting rod 145 is installed on the top of the threaded block 143. The connecting rod 145 passes through the pretreatment box 110 and connects to the push plate 144. The connecting rod 145 and the pretreatment box 110 are slidably connected, which improves the movement stability of the threaded block 143. The bottom of the push plate 144 is provided with a movable groove 146. A movable plate 147 is slidably arranged in the movable groove 146. A plurality of first elastic elements 148 are connected between the top of the movable groove 146 and the top of the movable plate 147. The first elastic elements 148 are preferably springs. The first elastic elements 148 can adapt to the accumulation of impurities of different thicknesses and make the movable plate 147 adapt to the actual height of the coarse grid 121 or fine grid 122, cooperate with the first vibration component 123, and ensure that the movable plate 147 always effectively contacts the surface of the coarse grid 121 or fine grid 122, thereby improving the cleaning reliability.

[0041] Reference Figure 3 and Figure 4 In this embodiment, the two sets of first cleaning mechanisms 140 can be connected by a timing belt assembly. That is, the threaded rod 142 in one set of first cleaning mechanisms 140 connected to the first driving member 141 can be connected to the threaded rod 142 in the other set of first cleaning mechanisms 140 by the timing belt assembly. In this way, the two threaded rods 142 can be driven to rotate synchronously by one first driving member 141, ensuring that the movable plate 147 cleans the impurities on the coarse screen 121 and the fine screen 122 at the same time.

[0042] The timing belt assembly is a combination of timing pulley and timing belt (the same below). Preferably, the timing pulley can be a toothed pulley, and the timing belt can be a toothed belt. The specific structure and working principle of the toothed pulley and toothed belt are common knowledge, so they will not be described in detail here.

[0043] The first vibration component 123 is used to vibrate the coarse screen 121 and the fine screen 122 to prevent the coarse screen 121 and the fine screen 122 from clogging. It can also help wastewater pass through the coarse screen 121 and the fine screen 122 quickly, further improving the overall filtration efficiency. At the same time, it reduces the deposition of impurities on the surface of the coarse screen 121 and the fine screen 122, indirectly extending the service life of the coarse screen 121 and the fine screen 122. The first reset component 124 is used to reset the coarse screen 121 and the fine screen 122, and to reset and calibrate the coarse screen 121 and the fine screen 122, to compensate for the displacement of the coarse screen 121 and the fine screen 122 that may be caused by simple vibration, to ensure the separation purity of wastewater, and to combine the anti-clogging effect of vibration with the protection of the coarse screen 121 and the fine screen 122, thereby further reducing the equipment maintenance cost.

[0044] Reference Figure 3 and Figure 6 In this embodiment, the pH adjustment mechanism 130 includes a pH reagent feed pipe 131, a first stirring assembly 132, and a floatation sensing assembly 133; pH reagent feed pipe 131 is connected to pretreatment tank 110. The first stirring component 132 and the floating sensing component 133 are located below the fine grid 122. The first stirring component 132 can be linked with the first vibration component 123. Specifically, the pH reagent inlet pipe 131 is connected to one side of the middle of the pretreatment tank 110, and the other end of the pH reagent inlet pipe 131 is connected to the pH reagent tank (not shown in the figure). A pH reagent dispensing pump (not shown in the figure) is provided on the pH reagent inlet pipe 131 to facilitate the delivery of pH reagent to the pretreatment tank 110 through the pH reagent inlet pipe 131. The connection between the pH reagent inlet pipe 131 and the pretreatment tank 110 is located below the fine grid 122. In this embodiment, two sets of first stirring components 132 are provided. One set of first stirring components 132 can be connected to the first vibration component 123 through a synchronous belt component, and the two sets of first stirring components 132 can be connected through gear transmission. The floating sensing component 133 is located in the lower part of the pretreatment tank 110.

[0045] The first stirring component 132 is used to mix the pH reagent with the wastewater; Specifically, a set of first stirring components 132 includes a first stirring shaft 1321 and a first stirring rod 1322. The first stirring shaft 1321 is rotatably disposed in the lower part of the pretreatment tank 110, and the first stirring shaft 1321 is arranged parallel to the first rotating shaft 1231. Multiple first stirring rods 1322 are installed on the first stirring shaft 1321. The first rotating shaft 1231 below the coarse screen 121 or fine screen 122 is connected to the first stirring shaft 1321 through a synchronous belt assembly. The ends of the two first stirring shafts 1321 away from the synchronous belt assembly pass through the pretreatment tank 110 and are connected to gears. The two gears mesh and are connected. Through the transmission of the two gears, the two first stirring shafts 1321 can be driven to rotate relative to each other, so as to fully mix the pH agent with the wastewater and avoid local pH unevenness from affecting the subsequent treatment effect. The gears can be covered with a shell (not shown in the figure) to protect the gears.

[0046] The floating sensor component 133 is used to detect the amount of wastewater. When the amount of wastewater reaches the limit, the wastewater enters the pulp fiber recycling unit 200.

[0047] Specifically, the floating sensing component 133 includes a slide rail 1331, a floating plate 1332, and a sensor 1333. The slide rail 1331 is vertically installed at the lower part of the pretreatment box 110. The floating plate 1332 is slidably connected to the slide rail 1331, which can stably raise and lower the floating plate 1332. The bottom of the support plate at the top of the slide rail 1331 is equipped with a sensor 1333 that is movably attached to the floating plate 1332. The sensor 1333 is electrically connected to the solenoid valves of the first inlet pipe 150 and the first outlet pipe 160. When the wastewater volume reaches the limit, the sensor 1333 closes the first inlet pipe 150 and opens the first outlet pipe 160 to discharge the wastewater into the pulp fiber recycling unit 200. After a period of time, the first inlet pipe 150 is opened again and the first outlet pipe 160 is closed.

[0048] Reference Figures 7 to 9 In this embodiment, the pulp fiber recycling unit 200 includes a pulp fiber recycling box 210, a dewatering box 220, a fiber filtration mechanism 230, a second cleaning mechanism 240, and a conveying and pressing mechanism 250. The pulp fiber recycling bin 210 is located below the pretreatment bin 110. A dewatering bin 220 is installed on the pulp fiber recycling bin 210. A fiber filtration mechanism 230 is installed inside the pulp fiber recycling bin 210. A second cleaning mechanism 240 corresponding to the fiber filtration mechanism 230 is installed inside the pulp fiber recycling bin 210. The structure of the second cleaning mechanism 240 is the same as that of the first cleaning mechanism 140. A conveying and squeezing mechanism 250 is installed inside the dewatering bin 220. Specifically, the pretreatment box 110 is mounted above the pulp fiber recycling box 210 via the first support leg 190; a dewatering box 220 is installed on one side of the pulp fiber recycling box 210, and the second cleaning mechanism 240 is located at the end of the pulp fiber recycling box 210 away from the dewatering box 220.

[0049] Reference Figure 7 The pulp fiber recycling bin 210 has a second inlet pipe 260 connected to the first outlet pipe 160 at its top. The lower part of the pulp fiber recycling bin 210 is funnel-shaped to facilitate wastewater discharge. A second outlet pipe 270 is installed at the bottom of the pulp fiber recycling bin 210 and connects to a conveying pipeline. A drive pump 600 is installed on the conveying pipeline to discharge wastewater to the anaerobic reaction tank 310. The pulp fiber recycling bin 210 has openings for connection with the fiber... The filter mechanism 230 has a corresponding discharge port, and the squeezing tank 220 has a pulp fiber discharge port corresponding to the conveying and squeezing mechanism 250. The squeezing tank 220 is equipped with a pulp fiber discharge pipe 280 corresponding to the pulp fiber discharge port. The pulp fiber recycling box 210 has second support legs 290 installed on both sides of the lower part to support the pulp fiber recycling box 210. Preferably, there are 4 second support legs 290, which are distributed in a rectangular array at the lower part of the pulp fiber recycling box 210.

[0050] The fiber filtration unit 230 is used to filter pulp fibers in wastewater; The second cleaning mechanism 240 is used to clean the pulp fibers trapped by the fiber filtration mechanism 230, and at the same time push the pulp fibers into the dewatering tank 220. Specifically, the second cleaning mechanism 240 is provided in a set, which has the same structure as the first cleaning mechanism 140, and the second cleaning mechanism 240 is provided with an outer shell to protect the second cleaning mechanism 240.

[0051] The conveying and squeezing mechanism 250 is used to dewater the pulp fibers and simultaneously convey the pulp fibers out of the squeezing tank 220.

[0052] Reference Figure 7 In this embodiment, the fiber filtration mechanism 230 includes a fiber filter screen 231, a second vibration component 232, and a second reset component 233. The fiber filter screen 231 is slidably disposed inside the pulp fiber recycling box 210. The mesh size of the fiber filter screen 231 is 0.15-0.3mm. A second vibration component 232 is disposed below the fiber filter screen 231, and a second reset component 233 is disposed on the top of the fiber filter screen 231. The structure of the second vibration component 232 is the same as that of the first vibration component 123, and the structure of the second reset component 233 is the same as that of the first reset component 124. Specifically, the fiber filter 231 is horizontally slidably disposed inside the pulp fiber recycling bin 210. The fiber filter 231 is used to recycle pulp fibers, and its mesh size is 0.15-0.3mm. It can intercept pulp fibers while allowing wastewater without impurities to pass through, thus preventing the fiber filter 231 from clogging. A maintenance door is rotatably provided on one side of the upper part of the pulp fiber recycling bin 210, which facilitates the removal of the fiber filter 231 for cleaning and replacement. In this embodiment, the fiber filter 231 corresponds to one set of second vibration components 232 and four sets of second reset components 233. The four sets of second reset components 233 are distributed at the top four corners of the fiber filter 231.

[0053] The second vibration component 232 is used to vibrate the fiber filter screen 231 to prevent the fiber filter screen 231 from clogging. It can also help wastewater pass through the fiber filter screen 231 quickly, further improving the overall filtration efficiency. At the same time, it reduces the deposition of pulp fibers on the surface of the fiber filter screen 231, indirectly extending the service life of the fiber filter screen 231. Specifically, the second vibration assembly 232 includes a second rotating shaft 2321, a second cam 2322, and a third drive component 2323. Two second rotating shafts 2321 are provided, rotatably mounted inside the pulp fiber recycling bin 210, and positioned on either side below the fiber filter screen 231. One end of each second rotating shaft 2321 is near the access door, and this end is rotatably connected to a support block. The support block is connected to the inner wall of the pulp fiber recycling bin 210. Second cams 2322 are mounted on both ends of the second rotating shafts 2321, and these cams can engage with the fiber filter screen 231. The bottom of the device is abutted, and one end of one of the second rotating shafts 2321 extends out of the pulp fiber recycling box 210 and connects to the output end of the third drive component 2323. The third drive component 2323 can be a servo motor, and its specific structure and working principle are common knowledge, so they will not be described in detail here. The third drive component 2323 is mounted on a horizontal plate, and one end of the horizontal plate is connected to the pulp fiber recycling box 210. The two second rotating shafts 2321 can be connected by a synchronous belt assembly. A shell (not shown in the figure) can be installed on the outside of the end of the second rotating shaft 2321 that extends out of the pulp fiber recycling box 210 to protect the third drive component 2323 and the corresponding synchronous belt assembly.

[0054] The second reset component 233 is used to reset the fiber filter 231.

[0055] Specifically, the groove 1241 of the second reset component 233 is opened on the inner wall of the pulp fiber recycling box 210, and the rest of the configuration is the same as the structure of the first reset component 124.

[0056] Reference Figure 8 and Figure 9In this embodiment, the conveying and extrusion mechanism 250 includes a conveying assembly 251 and an extrusion assembly 252; Both the conveying assembly 251 and the extrusion assembly 252 are disposed inside the dewatering tank 220, with the extrusion assembly 252 located above the conveying assembly 251; Specifically, a guide plate 221 is installed inside the squeezing tank 220 below the discharge port to guide the pulp fibers onto the conveying assembly 251; the bottom of the squeezing tank 220 is inclined, and the lower part of the squeezing tank 220 is connected to the pulp fiber recycling tank 210 through a return port 222, so that the wastewater squeezed out of the pulp fibers can flow back to the pulp fiber recycling tank 210 from the return port 222; the conveying assembly 251 can be connected to the second vibration assembly 232 through a synchronous belt assembly; the conveying assembly 251 and the squeezing assembly 252 can be connected by gear transmission.

[0057] Conveying assembly 251 is used to convey pulp fibers out of dewatering tank 220; Specifically, the conveying component 251 is a mesh belt conveyor, which is an existing device and its working principle is common knowledge, so it will not be described in detail here. Its mesh size is ≤0.15mm, and it includes a drive roller, a driven roller and a conveying mesh belt. The shaft of the drive roller can be connected to the second shaft 2321 connected to the third drive component 2323 through a synchronous belt assembly. The shaft of the driven roller is rotatably connected to the inner wall of the squeezing tank 220. The discharge end of the conveying mesh belt can extend to the pulp fiber discharge port, and an inclined first scraper 223 is installed at the bottom of the pulp fiber discharge port. The first scraper 223 can contact the lower surface of the discharge end of the conveying mesh belt to scrape off the pulp fibers on the conveying mesh belt.

[0058] Reference Figure 8 and Figure 9 The extrusion assembly 252 is used to extrude and dewater pulp fibers.

[0059] Specifically, the extrusion assembly 252 includes an extrusion roller 2521 and a second scraper 2522. The extrusion roller 2521 is rotatably disposed in the dewatering tank 220. The extrusion roller 2521 contacts the surface of the conveyor belt to dewater the pulp fibers. In this embodiment, the extrusion roller 2521 is located on the side surface near the drive roller. The end of the drive roller's shaft away from the synchronous belt assembly is connected to a gear. One end of the extrusion roller 2521 passes through the dewatering tank 220 and is connected to a gear. The two gears mesh and are connected. Through the transmission of the two gears, the drive roller rotates simultaneously. The extrusion roller 2521 can also rotate relative to the drive roller. Preferably, the rotation direction of the drive roller and the extrusion roller 2521 is from the feed inlet to the discharge outlet (i.e., the drive roller rotates clockwise and the extrusion roller 2521 rotates counterclockwise). The second scraper 2522 is installed obliquely in the squeezing tank 220, and the second scraper 2522 contacts the surface of the extrusion roller 2521 to scrape off the pulp fibers on the extrusion roller 2521, so as to avoid incomplete pulp fiber recycling. The gear can be covered with a shell (not shown) to protect the gear.

[0060] Working principle: During use, wastewater enters the pretreatment tank 110 through the first inlet pipe 150. Large particulate impurities are removed by the coarse screen 121, and small solid impurities are removed by the fine screen 122. The wastewater then enters the lower part of the pretreatment tank 110, where pH reagent enters through the pH reagent inlet pipe 131. Simultaneously, by activating the second drive component 1233, the first rotating shaft 1231 and the first stirring shaft 1231 are driven to rotate, which in turn drives the first cam 1232 and the first stirring rod 1322 to rotate. This vibrates the coarse and fine screens 121, adjusting the pH value of the wastewater to a suitable level. 6.5-7.5 When the wastewater volume reaches its limit, sensor 1333 closes the first inlet pipe 150 and opens the first outlet pipe 160 to discharge the wastewater into the pulp fiber recycling box 210. Then, the first drive component 141 is activated, which drives the threaded rod 142 to rotate, thereby driving the threaded block 143 to move, which in turn drives the push plate 144 and the first movable plate 147 to move. Through the push plate 144 and the first movable plate 147, the impurities on the coarse screen 121 and the fine screen 122 are discharged through the impurity discharge pipe 170. After the threaded block 143 is reset, the first inlet pipe 150 is reopened and the first outlet pipe 160 is closed. In the pulp fiber recycling bin 210, pulp fibers are recycled through the fiber filter screen 231. At the same time, the third drive component 2323 is activated, which drives the second rotating shaft 2321 to rotate, thereby driving the second cam 2322 to rotate and vibrate the fiber filter screen 231. After the wastewater enters the lower part of the pulp fiber recycling bin 210, the pulp fibers are pushed into the squeezing tank 220 by the second cleaning mechanism 240. The pulp fibers fall onto the conveying component 251 and are dewatered by the squeezing roller 2521. The dewatered pulp fibers are discharged from the pulp fiber discharge pipe 280, and the squeezed wastewater flows back to the pulp fiber recycling bin 210 from the return port 222. The wastewater is then transported to the anaerobic reaction tank 310 by the drive pump 600. The anaerobic microbial community in the anaerobic reactor 310 degrades the large molecular recalcitrant organic matter in the wastewater and converts it into small molecular organic matter. After the wastewater stays in the anaerobic reactor 310 for 12-24 hours, it is transported to the aerobic reactor 320 by the drive pump 600. By adding highly efficient degrading bacteria to the aerobic reaction tank 320 and providing sufficient oxygen through the aeration component 321, the small molecule organic matter and some residual recalcitrant organic matter in the wastewater are degraded. After the wastewater stays in the aerobic reaction tank 320 for 8-16 hours, the wastewater is transported to the sedimentation tank 330 by the drive pump 600. Wastewater stays in sedimentation tank 330 for 2-4 hours. After the supernatant is clear and the sludge has completely settled to the bottom of the tank, the supernatant can be transported to Fenton oxidation tank 410 by drive pump 600. Fenton reagent is added to Fenton oxidation tank 410 and the Fenton reagent is fully mixed with wastewater by the second stirring component 411 to degrade the residual recalcitrant organic matter and water color after biochemical treatment. After the wastewater stays in Fenton oxidation tank 410 for 1-2 hours, it is transported to ultrafiltration tank 420 by driving pump 600. Wastewater is purified by ultrafiltration membrane 421 in ultrafiltration tank 420, while intercepting residual colloids of toxic substances that have not been completely degraded. The purified water is then transported to storage tank 510 for testing and standby by drive pump 600.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A pulp wastewater treatment device for a fruit bag paper production line, characterized in that, include: A pretreatment unit (100) is used to remove impurities from wastewater and adjust the pH value of wastewater. A pulp fiber recycling unit (200) is located below the pretreatment unit (100). The pulp fiber recycling unit (200) is used to recycle pulp fibers and dewater the recycled pulp fibers. A biochemical treatment unit (300) is used to degrade recalcitrant organic matter; The deep treatment unit (400) is used to degrade the recalcitrant organic matter and water color remaining after biochemical treatment, and to purify the wastewater. The pulp fiber recycling unit (200), the biochemical treatment unit (300), and the deep treatment unit (400) are connected in sequence through conveying pipelines.

2. The pulp wastewater treatment device for the fruit bag paper production line according to claim 1, characterized in that, The pretreatment unit (100) includes a pretreatment tank (110), an impurity filtration mechanism (120), a pH adjustment mechanism (130), and a first cleaning mechanism (140). The pretreatment box (110) is provided with an impurity filtration mechanism (120) and a pH adjustment mechanism (130) arranged from top to bottom. The pretreatment box (110) is also provided with a first cleaning mechanism (140) corresponding to the impurity filtration mechanism (120). The impurity filtration mechanism (120) is used to remove impurities from wastewater; The pH adjustment mechanism (130) is used to adjust the pH value of the wastewater; The first cleaning mechanism (140) is used to clean the impurities trapped by the impurity filtration mechanism (120).

3. The pulp wastewater treatment device for the fruit bag paper production line according to claim 2, characterized in that, The impurity filtration mechanism (120) includes a coarse screen (121), a fine screen (122), a first vibration component (123), and a first reset component (124). The coarse screen (121) and the fine screen (122) are both slidably disposed in the pretreatment box (110), with the coarse screen (121) located above the fine screen (122). The grid pitch of the coarse screen (121) is 2-5mm, and the grid pitch of the fine screen (122) is 0.5-1mm. A first vibration component (123) is disposed below the coarse screen (121) and the fine screen (122). A first reset component (124) is disposed on the top of the coarse screen (121) and the fine screen (122). The first cleaning mechanism (140) is disposed corresponding to the coarse screen (121) and the fine screen (122). The first vibration assembly (123) is used to vibrate the coarse grid (121) and the fine grid (122) to prevent the coarse grid (121) and the fine grid (122) from clogging; The first reset component (124) is used to reset the coarse grid (121) and the fine grid (122).

4. The pulp wastewater treatment device for the fruit bag paper production line according to claim 3, characterized in that, The pH adjustment mechanism (130) includes a pH reagent feed pipe (131), a first stirring assembly (132), and a float sensing assembly (133). The pH reagent feed pipe (131) is connected to the pretreatment tank (110). The first stirring assembly (132) and the floating sensing assembly (133) are located below the fine grid (122). The first stirring assembly (132) can be linked with the first vibration assembly (123). The first stirring component (132) is used to mix the pH reagent with the wastewater; The floating sensing component (133) is used to detect the amount of wastewater. When the amount of wastewater reaches the limit, the wastewater enters the pulp fiber recycling unit (200).

5. The pulp wastewater treatment device for the fruit bag paper production line according to claim 3, characterized in that, The pulp fiber recycling unit (200) includes a pulp fiber recycling bin (210), a dewatering bin (220), a fiber filtration mechanism (230), a second cleaning mechanism (240), and a conveying and squeezing mechanism (250). The pulp fiber recycling bin (210) is located below the pretreatment bin (110). A dewatering bin (220) is installed on the pulp fiber recycling bin (210). A fiber filtration mechanism (230) is provided inside the pulp fiber recycling bin (210). A second cleaning mechanism (240) corresponding to the fiber filtration mechanism (230) is provided inside the pulp fiber recycling bin (210). The structure of the second cleaning mechanism (240) is the same as that of the first cleaning mechanism (140). A conveying and squeezing mechanism (250) is provided inside the dewatering bin (220). The fiber filtration mechanism (230) is used to filter pulp fibers in wastewater; The second cleaning mechanism (240) is used to clean the pulp fibers trapped by the fiber filtration mechanism (230) and push the pulp fibers into the dewatering tank (220); The conveying and squeezing mechanism (250) is used to dewater the pulp fibers and simultaneously convey the pulp fibers out of the squeezing tank (220).

6. The pulp wastewater treatment device for the fruit bag paper production line according to claim 5, characterized in that, The fiber filtration mechanism (230) includes a fiber filter screen (231), a second vibration component (232), and a second reset component (233). The fiber filter screen (231) is slidably disposed inside the pulp fiber recycling box (210). The mesh size of the fiber filter screen (231) is 0.15-0.3mm. A second vibration component (232) is disposed below the fiber filter screen (231), and a second reset component (233) is disposed on the top of the fiber filter screen (231). The structure of the second vibration component (232) is the same as that of the first vibration component (123), and the structure of the second reset component (233) is the same as that of the first reset component (124). The second vibration component (232) is used to vibrate the fiber filter (231) to prevent the fiber filter (231) from clogging; The second reset component (233) is used to reset the fiber filter (231).

7. The pulp wastewater treatment device for the fruit bag paper production line according to claim 5, characterized in that, The conveying and extrusion mechanism (250) includes a conveying assembly (251) and an extrusion assembly (252); The conveying assembly (251) and the extrusion assembly (252) are both disposed inside the dewatering tank (220), with the extrusion assembly (252) located above the conveying assembly (251); The conveying assembly (251) is used to convey pulp fibers out of the dewatering tank (220). The extrusion assembly (252) is used to extrude and dewater pulp fibers.

8. The pulp wastewater treatment device for the fruit bag paper production line according to claim 1, characterized in that, The biochemical treatment unit (300) includes an anaerobic reactor (310), an aerobic reactor (320), and a sedimentation tank (330) connected in sequence. The anaerobic reactor (310) is equipped with an anaerobic microbial carrier (311), the aerobic reactor (320) is equipped with an aeration component (321), and the lower part of the anaerobic reactor (310), the aerobic reactor (320) and the sedimentation tank (330) are all equipped with sludge discharge pipes (331). The anaerobic reactor (310) is used to degrade large molecular recalcitrant organic matter in wastewater; The aerobic reaction tank (320) is used to degrade small molecule organic matter and some residual recalcitrant organic matter in wastewater; The sedimentation tank (330) is used to settle the mixed activated sludge that flows out with the wastewater after biochemical treatment, thereby achieving sludge-water separation.

9. The pulp wastewater treatment device for the fruit bag paper production line according to claim 1, characterized in that, The deep treatment unit (400) includes a Fenton oxidation tank (410) and an ultrafiltration tank (420) connected in sequence. The Fenton oxidation tank (410) is equipped with a second stirring assembly (411), and the ultrafiltration tank (420) is equipped with an ultrafiltration membrane (421) and a backwashing assembly (422). The Fenton oxidation tank (410) is used to degrade the recalcitrant organic matter and water color remaining after biochemical treatment; The ultrafiltration tank (420) is used to purify wastewater.

10. The pulp wastewater treatment device for the fruit bag paper production line according to claim 1, characterized in that, The pulp wastewater treatment device also includes a reuse storage unit (500), which is connected to the deep treatment unit (400) through a conveying pipe. The reuse storage unit (500) includes a water storage tank (510), which is equipped with a water quality detection sensor. The outlet of the water storage tank (510) is connected to the water supply end of the fruit bag paper production line through a return pipe.

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