Papermaking production system utilizing biochemical sludge

Abstract

The invention provides a papermaking production system utilizing biochemical sludge, which relates to the technical field of biochemical sludge papermaking and comprises a biochemical sludge pretreatment system, a pulping system, a papermaking system and a wastewater / solid waste circulation treatment system. The biochemical sludge pretreatment system comprises a biochemical sludge fiber dissociation process and a settling tank, and the biochemical sludge fiber dissociation process is implemented through the settling tank; an L-shaped suspension suction pipe is welded to the top end part of the peripheral wall of the settling tank in a penetrating manner, an L-shaped suction pipe is slidably mounted in a vertical pipe section of the L-shaped suspension suction pipe, and a water suction opening in the head end of the L-shaped suction pipe is of an inclined cutting structure; a T-shaped supporting rod is welded to the L-shaped suction pipe, a rubber pad is fixed to the T-shaped supporting rod, and the rubber pad is in sliding friction contact with the perspective glass. The water suction port at the head end of the L-shaped suction pipe is of an inclined section structure, so that the volume of biochemical sludge flowing into the L-shaped suction pipe through the water suction port at the head end can be greatly reduced, and the probability that the water suction port at the head end is blocked is reduced.

Description

Technical Field

[0001] This invention relates to the field of biochemical sludge papermaking technology, and more particularly to a papermaking production system utilizing biochemical sludge. Background Technology

[0002] Finding low-cost, renewable alternative raw materials has become a key direction for the transformation of the paper industry. The small amount of natural fiber (such as plant fiber mixed in municipal sludge) and organic matter that can be converted into fibrous substances contained in biochemical sludge provide the possibility of using it as an auxiliary raw material for papermaking.

[0003] In existing papermaking production systems, the pipes used to extract suspensions containing biochemical sludge fibers are mostly stationary and fixed. This results in a fixed height of the suction port at the beginning of the pipe within the suspension layer. Consequently, when there is significant biochemical sludge settling and a thick sludge layer is formed, the pipe and its suction port are easily buried, causing the pipe to fail and become unusable. Furthermore, when there is less biochemical sludge settling and a thinner sludge layer is formed, the gap between the pipe and the sludge layer is large, making it impossible to extract the suspension within this gap range, thus affecting the pipe's ability to thoroughly and completely absorb the suspension. Summary of the Invention

[0004] In view of this, the present invention provides a papermaking production system using biochemical sludge to solve the problem that pipes for extracting suspensions containing biochemical sludge fibers are mostly stationary and fixed, resulting in the suction port at the beginning of the pipe being at a constant height in the suspension layer.

[0005] The technical solution proposed in this invention is: a papermaking production system utilizing biochemical sludge, specifically including a biochemical sludge pretreatment system, a pulping system, a papermaking system, and a wastewater / solid waste recycling system; the biochemical sludge pretreatment system includes a biochemical sludge fiber dissociation process and a settling tank, the biochemical sludge fiber dissociation process being implemented through the settling tank; an L-shaped suspension suction pipe is welded through the top portion of the periphery of the settling tank, and an L-shaped suction pipe is slidably installed in the vertical section of the L-shaped suspension suction pipe. The suction port at the head of the L-shaped suction pipe has an oblique section structure; the bottom end of the vertical pipe of the L-shaped suction pipe is integrally formed with an installation ring, and a rubber sealing ring is inlaid on the inner circumference of the installation ring. The vertical pipe section of the L-shaped suction pipe is in frictional and extrusion contact with the rubber sealing ring; a long viewing window is provided through the bottom part of the peripheral wall of the settling tank, and a transparent glass is inlaid inside the long viewing window; a T-shaped support rod is welded on the L-shaped suction pipe, and a rubber pad is fixed on the T-shaped support rod. The rubber pad is in sliding frictional contact with the transparent glass.

[0006] Furthermore, the top of the horizontal section of the L-shaped suction pipe is welded with two vertical pull shafts at intervals, and the top opening of the settling tank is sealed with a cover plate. Two bushings are symmetrically welded to the middle part of the cover plate, and the vertical pull shafts slide through the cover plate and bushings. Two rubber sealing rings are inlaid at intervals on the inner circumference of the bushing shaft hole, and the vertical pull shaft comes into contact with the rubber sealing rings through friction and compression. A rubber gasket is fixed to the outer edge of the bottom side of the cover plate, and the rubber gasket is in contact with the top of the settling tank.

[0007] Furthermore, a longitudinal connecting rod is fixedly connected between the top portions of the two vertical pull shafts; The top part of the outer periphery of the settling tank is welded with an installation plate, and a T-shaped transmission rod is slidably installed through the installation plate. The bottom part of the vertical section of the T-shaped transmission rod is fixed with a threaded sleeve, and the first end of the horizontal section of the T-shaped transmission rod is welded and fixed to the middle part of the longitudinal connecting rod.

[0008] Furthermore, a drive assembly is fixedly installed on the outer periphery of the settling tank. The drive assembly is integrally formed by a motor and a reducer, and a drive disc is welded to the top of the power output shaft of the reducer.

[0009] Furthermore, it also includes a threaded drive shaft, which engages with a threaded sleeve through a threaded screw. A transmission disc is welded to the bottom end of the threaded drive shaft, and the transmission disc is fixedly connected to the drive disc. The top end of the threaded drive shaft is rotatably engaged with the first end of the mounting plate. A limit ring is fixedly fitted on the top end, and the limit ring rotates and fits against the mounting plate. When the threaded drive shaft slides upward, it abuts against the limit ring, and when it slides downward, it abuts against the transmission disc.

[0010] Furthermore, a sludge inlet pipe is welded to the top of the outer periphery of the settling tank, and a conical sludge-gathering hood is welded to the bottom of the settling tank. A discharge pipe with a built-in valve is welded to the center of the bottom of the conical sludge-gathering hood, and a bracket is welded to the outer periphery of the conical sludge-gathering hood. An electrical control box is fixedly installed on the bottom of the outer periphery of the settling tank, and the electrical control box contains electrical control components for controlling the motor to start and stop. A manhole is opened through the periphery of the settling tank, and a manhole cover is fixed on the manhole cover. A sealing rubber ring is fixed to the inner outer edge of the manhole cover, and the sealing rubber ring is in contact with the outer end of the manhole periphery.

[0011] The biochemical wastewater is transported into the settling tank 1 through the sludge inlet pipe 101. The settling tank 1 is used to separate the biochemical sludge and biochemical sludge fibers in the biochemical wastewater. The lighter biochemical sludge fibers float to the top, while the heavier biochemical sludge sinks. This process can separate the biochemical sludge and biochemical sludge fibers. The biochemical sludge fibers that float to the top are mixed with the supernatant generated by the settling of the biochemical wastewater to form a suspension containing biochemical sludge fibers. An external delivery pump can pump the suspension into the pulping system for subsequent processing through the L-shaped suspension suction pipe 102 and the L-shaped suction pipe 1022.

[0012] Furthermore, the biochemical sludge pretreatment system also includes sterilization and pollutant removal processes to remove pollutants, reduce moisture content, extract usable fibers, and ensure the safety of raw materials.

[0013] Furthermore, the pulping system includes a raw material proportioning process and a pulping process, used to mix the pretreated sludge with other fiber raw materials to optimize fiber performance.

[0014] Furthermore, the papermaking system includes a pulp thickening process and a papermaking process, which are used to adjust the papermaking process parameters to ensure stable paper sheet formation, taking into account the characteristics of short sludge fibers and weak bonding.

[0015] Furthermore, the wastewater / solid waste recycling system includes a wastewater treatment process and a solid waste treatment process, used to treat the wastewater and solid waste generated by the papermaking system, achieving "zero discharge" or "near-zero discharge" and avoiding secondary pollution.

[0016] The papermaking system utilizing biochemical sludge provided by this invention has the following beneficial effects: 1. During the sedimentation and separation of biochemical sludge and biochemical sludge fibers, the varying content of the biochemical sludge may result in different heights of the sludge layers formed in the sedimentation tank and conical sludge hood. When the sludge layer is high, it may bury the L-shaped suction pipe and its initial suction port, rendering the L-shaped suction pipe unusable. When the sludge layer is low, the distance between the L-shaped suction pipe and its initial suction port and the sludge layer is too large, preventing the pumping of the suspension between them and the sludge layer, thus affecting the thorough and complete pumping of the suspension. The L-shaped suction pipe, with its sliding installation, can slide up and down along the vertical section to adjust its operating height, adapting to changes in the sludge layer's accumulation height and maintaining a suitable distance from the sludge layer. This ensures that it is not buried by the sludge layer while guaranteeing thorough and complete pumping of the suspension, making it highly practical.

[0017] Second, the rubber sealing ring, through its tight compression fit with the vertical section of the L-shaped suction pipe, can prevent the biochemical sludge fibers from being slidably squeezed into the sliding gap between the vertical section of the L-shaped suction pipe and the vertical section of the L-shaped suspension suction pipe, thus preventing the L-shaped suction pipe from getting stuck and affecting the sliding execution of the height adjustment operation of the L-shaped suction pipe.

[0018] Third, the rubber sealing ring can prevent the biochemical sludge fibers from being slidably squeezed into the sliding gap between the vertical pull shaft and the bushing through its tight compression fit with the vertical pull shaft, thus preventing the vertical pull shaft from sliding and getting stuck.

[0019] Fourth, the suction port at the first end of the L-shaped suction pipe is located on its horizontal section. The central axis of the suction port is parallel to the sludge layer, and the suction port is not directly facing the sludge layer. This can reduce the suction effect of the suction port on the settled biochemical sludge, reduce the volume of biochemical sludge sucked into the L-shaped suction pipe when extracting the suspension, help improve the purity of the suspension extraction, and reduce the probability of the L-shaped suction pipe being blocked by the sucked-in biochemical sludge.

[0020] 5. Because the suction port at the beginning of the L-shaped suction pipe has an oblique cross-section, the extended protrusion at the top of the suction port can block and shield the biochemical sludge that settles and falls from top to bottom inside the settling tank, greatly reducing the amount of biochemical sludge that flows into the L-shaped suction pipe through the suction port during this process, and reducing the chance of the suction port being blocked. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0022] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0023] In the attached diagram: Figure 1 A process flow diagram of the present invention is shown; Figure 2 A schematic diagram of the settling tank in this invention is shown from a front side view. Figure 3 A schematic diagram of the settling tank of the present invention is shown from the rear side view. Figure 4 A schematic diagram of the internal structure of the settling tank in this invention is shown in half section. Figure 5 The present invention is shown Figure 4 Enlarged structural diagram of section C; Figure 6 A half-section internal structure diagram of the L-shaped suspension pipette in this invention is shown; Figure 7 The present invention is shown Figure 6 Enlarged structural diagram of section B; Figure 8 A schematic diagram of the half-section internal structure of the bushing in this invention is shown; Figure 9 The present invention is shown Figure 8 Enlarged structural diagram of section A.

[0024] List of reference numerals in the attached diagram: 1. Settling tank; 101. Sludge inlet pipe; 102. L-shaped suspension suction pipe; 1021. Mounting ring; 1022. L-shaped suction pipe; 1023. Rubber sealing ring; 1024. T-shaped support rod; 1025. Rubber pad; 103. Vertical pull shaft; 104. Longitudinal connecting rod; 105. T-shaped transmission rod; 1051. Threaded sleeve; 106. Mounting plate; 107. Conical sludge collection cover; 108. Discharge pipe; 109. Support; 2. Cover plate; 201. Bushing; 202. Rubber sealing ring; 3. Threaded drive shaft; 301. Limit ring; 302. Transmission disc; 4. Manhole; 401. Manhole cover; 5. Electrical control box; 6. Drive assembly; 601. Drive disk; 7. Long viewing window; 701. Transparent glass. Detailed Implementation

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

[0026] Please refer to Figures 1 to 9 Example 1: This embodiment proposes a papermaking system utilizing biochemical sludge, including a biochemical sludge pretreatment system, a pulping system, a papermaking system, and a wastewater / solid waste recycling system. The biochemical sludge pretreatment system includes a biochemical sludge fiber dissociation process and a settling tank 1. The biochemical sludge fiber dissociation process is implemented through the settling tank 1. An L-shaped suspension suction pipe 102 is welded through the top part of the perimeter wall of the settling tank 1. An L-shaped suction pipe 1022 is slidably installed in the vertical section of the L-shaped suspension suction pipe 102. The suction port at the first end of the L-shaped suction pipe 1022 has an oblique cross-section. The L-shaped suction pipe 1022 is vertically... An integrally formed mounting ring 1021 is formed at the bottom end of the riser pipe. A rubber sealing ring 1023 is embedded in the inner circumference of the mounting ring 1021. The vertical section of the L-shaped suction pipe 1022 is in frictional and extrusion contact with the rubber sealing ring 1023. A long viewing window 7 is provided through the bottom part of the perimeter wall of the settling tank 1. A transparent glass 701 is embedded inside the long viewing window 7. A T-shaped support rod 1024 is welded to the corner part of the L-shaped suction pipe 1022. A rubber pad 1025 is fixed to the outside of the horizontal section of the T-shaped support rod 1024. The rubber pad 1025 is in sliding frictional contact with the transparent glass 701.

[0027] Preferably, the top of the horizontal section of the L-shaped suction pipe 1022 is welded with two vertical pull shafts 103 at intervals. The top opening of the settling tank 1 is sealed with a cover plate 2. The middle part of the cover plate 2 is symmetrically welded with two bushings 201. The vertical pull shafts 103 slide through and are in contact with the cover plate 2 and the bushings 201. Two rubber sealing rings 202 are installed in the inner circumference of the shaft hole of the bushing 201 at intervals. The vertical pull shafts 103 and the rubber sealing rings 202 are in frictional and extrusion contact. A rubber gasket is fixed on the outer edge of the bottom side of the cover plate 2. The rubber gasket is in pressure and contact with the top of the settling tank 1.

[0028] Preferably, a longitudinal connecting rod 104 is fixedly connected between the top ends of the two vertical pull shafts 103; an mounting plate 106 is welded to the top end of the outer periphery of the settling tank 1, a T-shaped transmission rod 105 is slidably mounted through the mounting plate 106, a threaded sleeve 1051 is fixedly connected to the bottom end of the vertical section of the T-shaped transmission rod 105, and the first end of the horizontal section of the T-shaped transmission rod 105 is welded and fixed to the middle part of the longitudinal connecting rod 104.

[0029] Preferably, a drive assembly 6 is fixedly installed on the outer periphery of the settling tank 1. The drive assembly 6 is integrally formed by a motor and a reducer, and a drive disc 601 is welded to the top of the power output shaft of the reducer.

[0030] Preferably, it also includes a threaded drive shaft 3, which is threaded and engaged with the threaded sleeve 1051. A transmission disk 302 is welded to the bottom end of the threaded drive shaft 3, and the transmission disk 302 is fixedly connected to the drive disk 601. The top part of the threaded drive shaft 3 is rotatably engaged with the first part of the mounting plate 106. A limit ring 301 is fixedly fitted on the top part. The limit ring 301 is rotatably attached to the mounting plate 106. When the threaded drive shaft 3 slides upward, it abuts against the limit ring 301, and when it slides downward, it abuts against the transmission disk 302.

[0031] Preferably, a sludge inlet pipe 101 is welded to the top of the outer periphery of the settling tank 1, a conical sludge-collecting cover 107 is welded to the bottom of the settling tank 1, a discharge pipe 108 with a built-in valve is welded to the center of the bottom of the conical sludge-collecting cover 107, and a bracket 109 is welded to the outer periphery of the conical sludge-collecting cover 107; an electrical control box 5 is fixedly installed on the bottom side of the outer periphery of the settling tank 1, and an electrical control element for controlling the motor to start and stop is installed inside the electrical control box 5; a manhole 4 is opened through the periphery of the settling tank 1, and a cover 401 is sealed on the manhole 4. A sealing rubber ring is fixed to the outer edge of the inner side of the cover 401, and the sealing rubber ring is in contact with the outer end of the periphery of the manhole 4.

[0032] The following provides a detailed explanation of the specific details, implementation steps, functions and interrelationships of the features in the above embodiments, and the roles these features play in implementing this technical solution: Biochemical wastewater is transported into settling tank 1 through sludge inlet pipe 101. Settling tank 1 is used to separate biochemical sludge and biochemical sludge fibers in biochemical wastewater. The lighter biochemical sludge fibers float to the top, while the heavier biochemical sludge sinks to the bottom. This process can separate biochemical sludge and biochemical sludge fibers. The biochemical sludge fibers that float to the top are mixed with the supernatant generated by the settling of biochemical wastewater to form a suspension containing biochemical sludge fibers. An external delivery pump can pump the suspension into the pulping system for subsequent processing through L-shaped suspension suction pipe 102 and L-shaped suction pipe 1022. It is worth noting that the sedimentation and separation of biochemical sludge and biochemical sludge fiber is carried out intermittently and in stages. That is, after sedimentation tank 1 is filled with biochemical sewage, the sedimentation time is waited for. Then, after the waiting time is reached and the separation of biochemical sludge and biochemical sludge fiber is completed, the two are pumped and transported separately, and then a new round of sedimentation treatment is carried out.

[0033] When separating biochemical sludge and biochemical sludge fibers through sedimentation, the different contents of the biochemical sludge may result in different heights of the sludge layers formed in the sedimentation tank 1 and the conical sludge hood 107. When the sludge layer is high, it may bury the L-shaped suction pipe 1022 and its first suction port, rendering the L-shaped suction pipe 1022 unusable. When the sludge layer is low, the distance between the L-shaped suction pipe 1022 and its first suction port and the sludge layer is too large, preventing the pumping of the suspension between the pipe and the sludge layer and affecting the complete and thorough pumping of the suspension. The L-shaped suction pipe 1022 adopts a sliding installation form, which can slide up and down along the vertical section of the L-shaped suspension suction pipe 102 to adjust the working height, adapt to changes in the sludge layer accumulation height, and always maintain a suitable distance from the sludge layer. This ensures that it is not buried by the sludge layer and can guarantee the complete and thorough pumping of the suspension, making it more practical.

[0034] The rubber sealing ring 1023, through its tight compression fit with the vertical section of the L-shaped suction pipe 1022, can prevent the biochemical sludge fibers from being slidably squeezed into the sliding gap between the vertical section of the L-shaped suction pipe 1022 and the vertical section of the L-shaped suspension suction pipe 102, thus preventing the L-shaped suction pipe 1022 from becoming stuck and hindering the sliding execution of the height adjustment operation of the L-shaped suction pipe 1022.

[0035] When the threaded drive shaft 3 rotates in both directions, it can drive the threaded sleeve 1051, the T-shaped transmission rod 105, the two vertical pull shafts 103, and the L-shaped suction tube 1022 to slide up and down, thereby adjusting the working height of the L-shaped suspension suction tube 102. The rubber sealing ring 202 can prevent the biochemical sludge fibers from being slidably squeezed into the sliding gap between the vertical pull shaft 103 and the bushing 201 through its tight compression fit with the vertical pull shaft 103, thus preventing the vertical pull shaft 103 from sliding and jamming. The drive assembly 6 is used to drive the threaded drive shaft 3 to rotate in both directions.

[0036] Workers can enter the settling tank 1 through manhole 4, which facilitates dredging of the settling tank 1 and maintenance and replacement of the structures inside the settling tank 1.

[0037] The water level of the suspension inside the settling tank 1 can be observed through the long viewing window 7. Since the rubber pad 1025 is connected to the L-shaped suction pipe 1022 through the T-shaped support rod 1024, and the rubber pad 1025 is in sliding friction contact with the transparent glass 701, the position of the rubber pad 1025 can be observed through the long viewing window 7. By observing the position of the rubber pad 1025, the height of the L-shaped suction pipe 1022 and its first end suction port in the suspension can be determined, and the height of the L-shaped suction pipe 1022 can be adjusted by sliding based on this.

[0038] The suction port at the first end of the L-shaped suction pipe 1022 is located on its horizontal section. The central axis of the suction port is parallel to the sludge layer, and the suction port is not directly facing the sludge layer. This reduces the suction effect of the suction port on the settled biochemical sludge, reduces the amount of biochemical sludge sucked into the L-shaped suction pipe 1022 when extracting the suspension, helps to improve the purity of the suspension extraction, and reduces the probability of the L-shaped suction pipe 1022 being blocked by the sucked-in biochemical sludge.

[0039] Because the suction port at the first end of the L-shaped suction pipe 1022 has an oblique cross-section, the extended protrusion at the top of the suction port can block and shield the biochemical sludge that settles and falls from top to bottom inside the settling tank 1, greatly reducing the amount of biochemical sludge that flows into the L-shaped suction pipe 1022 through the suction port during this process, and reducing the probability that the suction port will be blocked.

[0040] The limiting ring 301 and the transmission disc 302 work together to slide and limit the threaded sleeve 1051 and the L-shaped suction tube 1022, preventing the L-shaped suction tube 1022 from sliding away from the L-shaped suspension suction tube 102.

[0041] Each time biochemical sludge and biochemical sludge fiber are separated by sedimentation, the L-shaped suction pipe 1022 must be slid to its highest position to avoid burying the L-shaped suction pipe 1022 when the sludge layer is too thick or too high.

[0042] Implementation 2: This embodiment is based on Implementation 1, but with the following additions: The biochemical sludge pretreatment system also includes a dewatering and volume reduction process and a sterilization and pollutant removal process, which are used to remove pollutants, reduce moisture content, extract usable fibers, and ensure the safety of raw materials; Sterilization and contaminant removal processes: High-temperature sterilization: Sterilizes pathogens (bacteria, viruses, etc.) in biological wastewater by heating with steam (121℃, 30 minutes) and volatilizes some volatile organic compounds (VOCs). Heavy metal removal: Chemical rinsing (such as citric acid, EDTA solution) or biological rinsing (using sulfur-oxidizing bacteria) is used to transfer heavy metal ions (such as Pb, Cd, Cr) in biological wastewater to the liquid phase, and then they are removed by precipitation separation. Impurity screening: Use a vibrating screen (0.5-1mm aperture) to remove solid impurities such as sand and plastic; Biochemical sludge fiber dissociation process: Biochemical sludge and biochemical sludge fibers in biochemical wastewater after sterilization and impurity removal are separated by settling tank 1. The heavier biochemical sludge settles and accumulates in the conical sludge hood 1, and is periodically pumped into an external sludge treatment system through an external sludge pump via a discharge pipe 108 and an external pipeline connected to the discharge pipe 108 for harmless treatment before discharge or recycling. The dissociated light biochemical sludge fibers float up and mix with the supernatant formed by the settling of biochemical wastewater to generate a suspension containing biochemical sludge fibers. The suspension is pumped and transported to the pulping system for subsequent processing through an L-shaped suspension suction pipe 102 and an L-shaped suction pipe 1022.

[0043] The pulping system includes a raw material proportioning process and a pulping process, which is used to mix pretreated sludge with other fiber raw materials to optimize fiber performance (sludge fibers are short and have low strength, so they need to be mixed with long fiber raw materials). Raw material proportioning process: Biochemical sludge fiber (20%–40%) + waste paper pulp / straw pulp (50%–70%) + a small amount of wood pulp (10%–20%, to improve strength); Applicable products: Packaging paper (such as corrugated base paper), toilet paper (with low strength requirements), gypsum board facing paper, etc. Pulping process: Mechanical dissociation: After mixing sludge particles with other raw materials, they are fed into a high-concentration hydraulic pulper with a concentration of 15% to 20%, where the fibers are separated by mechanical shearing force. Mild chemical treatment: Add a small amount of NaOH (0.5%–1%) and hydrogen peroxide (1%–2%) to adjust the pH to 8–9, remove some residual organic matter, and at the same time, perform mild bleaching to improve whiteness to 50–70% ISO, to meet mid-to-low-end needs; Screening and purification: Undissociated impurities are removed using a pressure screen with a slit width of 0.15-0.2mm, and heavy impurities such as metal shavings are separated by a slag remover.

[0044] The papermaking system includes a pulp thickening process and a papermaking process. It is used to adjust the papermaking process parameters to ensure stable paper formation, taking into account the characteristics of short sludge fibers and weak binding force. Pulp thickening process: Dilute the pulp concentration to 0.8%–1.2% after pulping, and add additives; Fillers such as calcium carbonate, used at a dosage of 5% to 10%, improve smoothness and printability; Defoamers such as silicone reduce foaming problems caused by organic matter in sludge; Papermaking process: Web section: A long web forming device is used to reduce the machine speed by 300-500m / min, extend the dehydration time, and avoid fiber flocculation; Pressing section: An additional vacuum pressing step is added to further reduce the moisture content to 50%–55%; Calendering and winding: Light calendering with a pressure of 50-100kN / m improves surface smoothness, and then winding into finished paper rolls.

[0045] The wastewater / solid waste recycling system includes wastewater treatment and solid waste treatment processes, which are used to treat the wastewater and solid waste generated by the papermaking system to achieve "zero discharge" or "near-zero discharge" and avoid secondary pollution; Wastewater treatment process: Wastewater from the papermaking wire section and press section contains fine fibers and additives. It is first filtered through an inclined screen to recover the fibers and then returned to the pulping system. The remaining wastewater enters the biochemical treatment unit A / O process to degrade COD and BOD, and then passes through membrane filtration, ultrafiltration and reverse osmosis to achieve water reuse for pulp dilution and equipment cleaning. The concentrated water is treated by evaporation and crystallization. Solid waste treatment process: Heavy metal waste residue and screening impurities generated during the pretreatment stage are sent to a hazardous waste treatment center for safe disposal. VOCs volatilized during the drying process are purified by activated carbon adsorption and catalytic combustion before being released.

[0046] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0047] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0048] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A papermaking production system utilizing biochemical sludge, comprising a biochemical sludge pretreatment system, a pulping system, a papermaking system, and a wastewater / solid waste recycling system; Its features are, The biochemical sludge pretreatment system includes a biochemical sludge fiber dissociation process and a settling tank (1). The biochemical sludge fiber dissociation process is carried out through the settling tank (1). An L-shaped suspension suction pipe (102) is welded through the top part of the periphery of the settling tank (1). An L-shaped suction pipe (1022) is slidably installed in the vertical section of the L-shaped suspension suction pipe (102). The suction port at the head end of the L-shaped suction pipe (1022) has an oblique section structure. An installation ring (1021) is integrally formed at the bottom end of the vertical pipe end of the L-shaped suction pipe (1022). A rubber sealing ring (1023) is inlaid on the inner circumference of the settling tank (1), and the vertical section of the L-shaped suction pipe (1022) is in frictional and extrusion contact with the rubber sealing ring (1023); a long strip window (7) is provided through the bottom part of the periphery of the settling tank (1), and a transparent glass (701) is inlaid inside the long strip window (7); a T-shaped support rod (1024) is welded on the L-shaped suction pipe (1022), and a rubber pad (1025) is fixed on the T-shaped support rod (1024), and the rubber pad (1025) is in sliding frictional contact with the transparent glass (701).

2. The papermaking production system utilizing biochemical sludge according to claim 1, characterized in that, The top of the horizontal section of the L-shaped suction pipe (1022) is welded with two vertical pull shafts (103) at intervals. The top opening of the settling tank (1) is sealed with a cover plate (2). The middle part of the cover plate (2) is symmetrically welded with two bushings (201). The vertical pull shafts (103) slide through the cover plate (2) and the bushings (201). Two rubber sealing rings (202) are inlaid at intervals on the inner circumference of the bushing (201) shaft hole, and the vertical pull shaft (103) is in frictional and extrusion contact with the rubber sealing rings (202); A rubber gasket is fixed to the outer edge of the bottom side of the cover plate (2), and the rubber gasket is in contact with the top of the settling tank (1).

3. A papermaking production system utilizing biochemical sludge according to claim 2, characterized in that, A longitudinal connecting rod (104) is fixedly connected between the top portions of the two vertical pull shafts (103). The top part of the outer periphery of the settling tank (1) is welded with an installation plate (106), and a T-shaped transmission rod (105) is slidably installed through the installation plate (106). The bottom part of the vertical section of the T-shaped transmission rod (105) is fixedly connected with a threaded sleeve (1051), and the first end of the horizontal section of the T-shaped transmission rod (105) is welded and fixed to the middle part of the longitudinal connecting rod (104).

4. A papermaking production system utilizing biochemical sludge according to claim 3, characterized in that, The settling tank (1) is fixedly installed with a drive assembly (6) on its outer periphery. The drive assembly (6) is formed by the motor and the reducer in one piece. The top of the reducer's power output shaft is welded with a drive disc (601).

5. A papermaking production system utilizing biochemical sludge according to claim 4, characterized in that, It also includes a threaded drive shaft (3), which is threaded and meshes with the threaded sleeve (1051) through a threaded screw. A transmission disk (302) is welded to the bottom end of the threaded drive shaft (3), and the transmission disk (302) is docked and fixed with the drive disk (601). The top part of the threaded drive shaft (3) is rotated through and engaged with the first part of the mounting plate (106). The top part is fixedly fitted with a limiting ring (301). The limiting ring (301) rotates and fits against the mounting plate (106). When the threaded drive shaft (3) slides upward, it abuts against the limiting ring (301). When it slides downward, it abuts against the transmission disc (302).

6. A papermaking production system utilizing biochemical sludge according to claim 4, characterized in that, The settling tank (1) is welded with a sludge inlet pipe (101) at the top of its outer periphery, and a conical sludge hood (107) is welded to the bottom of the settling tank (1). A discharge pipe (108) with a valve is welded to the center of the bottom of the conical sludge hood (107), and a support (109) is welded to the outer periphery of the conical sludge hood (107). An electrical control box (5) is fixedly installed on the bottom side of the outer periphery of the settling tank (1). The electrical control box (5) is equipped with electrical control components for controlling the motor to start and stop. A manhole (4) is provided through the perimeter wall of the settling tank (1). A cover (401) is provided on the manhole (4). A sealing rubber ring is fixed on the inner side of the cover (401). The sealing rubber ring is pressed against the outer side of the perimeter wall of the manhole (4).

7. A papermaking production system utilizing biochemical sludge according to claim 1, characterized in that, The biochemical sludge pretreatment system also includes sterilization and pollutant removal processes to remove pollutants, extract usable fibers, and ensure the safety of raw materials.

8. A papermaking production system utilizing biochemical sludge according to claim 1, characterized in that, The pulping system includes a raw material proportioning process and a pulping process, which is used to mix pretreated sludge with other fiber raw materials to optimize fiber performance.

9. A papermaking production system utilizing biochemical sludge according to claim 1, characterized in that, The papermaking system includes a pulp thickening process and a papermaking process, which are used to adjust the papermaking process parameters to ensure stable paper formation, taking into account the characteristics of short sludge fibers and weak bonding.

10. A papermaking production system utilizing biochemical sludge according to claim 1, characterized in that, The wastewater / solid waste recycling system includes wastewater treatment and solid waste treatment processes, used to treat wastewater and solid waste generated by the papermaking system, achieving "zero discharge" or "near-zero discharge" and avoiding secondary pollution.

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