A wastewater COD degradation device

Abstract

This invention discloses a wastewater COD degradation device, comprising a degradation tank placed on the ground and an inlet pipe connected to the degradation tank. The top of the inlet pipe is higher than the top of the degradation tank. A collection tank is connected to the end of the inlet pipe furthest from the degradation tank. The top of the collection tank is open and covered with a filter screen. A drain pipe is also connected to the collection tank to guide wastewater into it. The connection point between the drain pipe and the collection tank is higher than the filter screen, while the connection point between the inlet pipe and the collection tank is lower than the filter screen. The filter screen is inclined downwards from one end to the other. A drainage channel is provided at the connection point between the collection tank and the lowest point of the filter screen to discharge suspended solids filtered by the filter screen outside the collection tank. This application improves the COD degradation efficiency of the device by filtering suspended solids in papermaking wastewater, thereby reducing the irradiation effect of suspended solids on ultraviolet light and enhancing the COD degradation efficiency of the wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment devices, and in particular to a wastewater COD degradation device. Background Technology

[0002] COD (Chemical Oxygen Demand) refers to the amount of oxidant consumed when treating a water sample under certain conditions using a strong oxidant. The unit of COD is mg / L. COD reflects the degree of pollution in water; the higher the COD value, the more severe the pollution by reducing substances. Therefore, the COD content of wastewater is usually used as a reference value for wastewater discharge. To meet discharge standards, wastewater typically needs to pass through a COD degradation device to degrade the COD before being discharged into rivers.

[0003] Currently, devices used for degrading COD in wastewater generally include an oxidation reaction tank, a deoxygenation type COD degradation lamp located inside the oxidation reaction tank, and an oxidizing agent injection tank for adding oxidation catalyst to the oxidation reaction tank. The oxidation catalyst is added to the oxidation reaction tank through the oxidizing agent injection tank, and the oxidation catalyst in the oxidation reaction tank is activated by ultraviolet light irradiation, resulting in the oxidation reaction tank containing a large amount of oxidizing substances. Under ultraviolet light irradiation, the wastewater in the oxidation reaction tank undergoes a series of oxidation reactions, decomposing the reducing substances in the wastewater, thereby reducing the COD value of the wastewater.

[0004] Regarding the aforementioned technologies, the inventors believe that the wastewater generated during the papermaking process contains a large amount of suspended solids, mainly including fibers and fiber fines. Fibers and fiber fines have poor light transmittance, and the suspended solids flowing into the oxidation reaction tank block ultraviolet radiation in the wastewater. This makes it difficult for the ultraviolet light from the COD degradation lamp to reach the oxidation catalyst in the oxidation reaction tank, thus reducing the efficiency of the wastewater COD degradation device. Therefore, there is still room for improvement. Summary of the Invention

[0005] In order to improve the COD degradation efficiency of COD degradation devices in papermaking wastewater, this application provides a wastewater COD degradation device.

[0006] The wastewater COD degradation device provided in this application adopts the following technical solution:

[0007] A wastewater COD degradation device includes a degradation tank placed on the ground and an inlet pipe connected to the degradation tank. The top of the inlet pipe is higher than the top of the degradation tank. The end of the inlet pipe away from the degradation tank is connected to a collection tank. The top of the collection tank is open, and a filter screen covering the top opening is fixed inside the collection tank. A drain pipe for guiding wastewater into the collection tank is also connected to the collection tank. The horizontal level of the connection between the drain pipe and the collection tank is higher than the filter screen, and the horizontal level of the connection between the inlet pipe and the collection tank is lower than the filter screen. The filter screen is inclined downward from one end to the other end, and a notch is provided at the connection between the collection tank and the lowest horizontal level end of the filter screen for the suspended solids filtered by the filter screen to be discharged outside the collection tank.

[0008] By adopting the above technical solution, wastewater discharged into the collection tank through the drain pipe passes through a filter screen. Suspended solids in the wastewater are filtered out by the screen. When the suspended solids accumulate to a certain extent, the filtration speed slows down, and water may even accumulate on the screen. This water flows along the inclined screen towards the notch, carrying the accumulated suspended solids towards the notch. Ultimately, the suspended solids are discharged through the notch to the outside of the collection tank by the water flow, thus automatically cleaning the screen. This makes the screen less prone to clogging due to the small size of the fibers and fine fibers requiring very small pores for effective removal. This ensures more complete filtration of suspended solids, reducing the impact of fibers and fine fibers on the COD degradation process of the wastewater treatment device, and also minimizing the impact on the filtration efficiency of the collection tank. Furthermore, it makes screen cleaning easier, requiring no additional manual maintenance.

[0009] Preferably, the vertical cross-section of the filter screen is an arc surface, and the arc surface protrudes towards the connection between the water collection tank and the water inlet pipe.

[0010] By adopting the above technical solution, when papermaking wastewater falls into the filter screen, the water spray caused by gravity and the small mesh size of the filter screen is blocked by the curved surface of the filter screen and is not easily sprayed outside the filter screen, thus helping to reduce the waste of papermaking wastewater.

[0011] Preferably, the bottom wall of the water collection tank is inclined downwards towards the connection between the water inlet pipe and the water collection tank.

[0012] By adopting the above technical solution, the wastewater filtered by the filter screen in the water collection tank can more easily flow along the inclined bottom wall to the connection between the water inlet pipe and the water collection tank, and then be discharged into the COD degradation device through the water inlet pipe. This helps to reduce the residual wastewater in the water collection tank, allowing the wastewater to be more completely recycled and reused, and reducing waste.

[0013] Preferably, the inner wall of the water collection tank near the end with the lowest horizontal height of the filter screen is also provided with a baffle, and the baffle and the inner wall of the water collection tank form a water trough. The baffle and the filter screen are spaced apart, and the part of the filter screen near the end with the lowest horizontal height is placed in the water trough.

[0014] By adopting the above technical solution, the baffle makes it easier for water to accumulate at the lowest point of the filter screen. This makes it easier for the lowest point of the filter screen to be immersed in the water in the tank. Consequently, suspended matter attached to the lowest point of the filter screen is more easily suspended due to being submerged in the papermaking wastewater in the tank. This further enhances the fluidity of the suspended matter at the lowest point of the filter screen and makes it easier for it to be discharged to the bottom of the filter screen and out of the collection tank under the influence of gravity. This makes the filter screen less likely to be clogged by accumulated suspended matter, thus reducing its filtration efficiency.

[0015] Preferably, the baffle is inclined, and the inclination direction of the baffle is consistent with the inclination direction of the filter screen.

[0016] By adopting the above technical solution, the arc surface of the filter screen convexes towards the baffle, so that the water level in the tank is oriented towards the lowest point of the arc surface of the filter screen. This makes it easier for the papermaking wastewater in the tank to submerge the suspended matter attached to the filter screen. It is also beneficial for the papermaking wastewater on the side of the filter screen near the outlet pipe to carry the suspended matter to the lower part of the filter screen when it flows towards the lower part of the filter screen. This further makes the filter screen less likely to be clogged by accumulated suspended matter, thus reducing its filtration efficiency.

[0017] Preferably, the highest point of the baffle is higher than the lowest point of the filter screen, and the filter screen is elastic.

[0018] By adopting the above technical solution, when papermaking wastewater is discharged from the drain pipe to the end of the filter screen near the drain pipe, the wastewater impacts the filter screen, causing the elastic filter screen to vibrate. Suspended solids attached to the filter screen are more likely to flow towards the lower end of the filter screen due to this vibration, making it less likely for them to adhere to the center of the filter screen. Simultaneously, suspended solids in the papermaking wastewater at the lowest end of the filter screen, submerged in the water tank, are more easily discharged through the gap into the collection tank by the vibration force of the filter screen, entering the next process. This further reduces the likelihood of suspended solids accumulating on the filter screen due to the smaller amount of wastewater flowing through that end, thus further minimizing the impact on the filtration efficiency of the filter screen as suspended solids accumulate from the lower to the higher parts of the screen.

[0019] Preferably, the baffle also has a drainage hole at its lowest horizontal height, and the baffle is also provided with a switch plate for opening and closing the drainage hole.

[0020] By adopting the above technical solution, when papermaking wastewater needs to be filtered, the drain hole is closed by the switch plate, allowing the filtered papermaking wastewater to be stored in the tank. This submerges suspended solids attached to the lowest point of the filter screen, making it easier for these solids to be discharged through the drain hole into the collection tank. After the papermaking wastewater filtration is complete, the switch plate is opened, connecting the drain hole to the collection tank. This allows water in the tank to flow into the degradation tank through the drain hole and inlet pipe, reducing waste caused by wastewater remaining in the tank. It also helps prevent the tank from stagnating and developing an odor due to prolonged water accumulation.

[0021] Preferably, the water collection tank is also provided with an elastic element that drives the switch plate to always close the drain hole.

[0022] By adopting the above technical solution and through flexible design, the switch plate can always keep the drain hole closed under normal conditions, allowing water to accumulate in the tank. This facilitates the discharge of suspended solids accumulated at the lowest point of the filter screen through the drain hole to the outside of the collection tank. When the water in the tank accumulates to a certain level, the switch plate will overcome the elastic force of the elastic element due to the gravity of the water in the tank, causing the drain hole to open. This allows the water in the tank to be automatically discharged into the collection tank. This prevents water from accumulating excessively and continuously being discharged through the drain hole, thus avoiding water waste. At the same time, the automatic drainage of water in the tank reduces the frequency of manual maintenance and cleaning. Furthermore, it allows the switch plate to more intelligently adapt to actual usage needs and automatically switch states.

[0023] Preferably, the baffle is further provided with a driving component for driving the switch plate to open and close the drain hole, and the end of the driving component away from the baffle extends out of the water collection tank.

[0024] By adopting the above technical solution, when it is necessary to discharge papermaking wastewater from the water tank to the degradation tank, the water in the water tank can be completely drained by manually operating the drive mechanism to open the drain hole. This helps reduce the amount of water remaining in the water tank, preventing the elastic force of the spring element from causing the switch to open and resulting in water accumulation in the water tank that cannot be drained. This helps reduce waste or foul odors caused by water remaining in the water tank. At the same time, the end of the drive mechanism away from the baffle is placed outside the water collection tank, making it simpler and more convenient to manually open and close the drain hole.

[0025] Preferably, the baffle is further provided with a limiting member that restricts the movement of the switch plate along the length direction of the elastic member.

[0026] By adopting the above technical solution, the movement direction of the switch plate is restricted by the limiting component, so that the switch plate can only move along the length direction of the elastic component. This allows the switch plate to always move towards or away from the drain hole, which helps to reduce the situation where the position of the switch plate is easily offset during the opening and closing of the drain hole, thus affecting the opening and closing state of the drain hole. This makes the switching of the opening and closing state of the drain hole more accurate.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By setting up a degradation tank, a water collection tank connected to the degradation tank, a filter screen fixed inside the water collection tank, and a water flow channel, the filter screen can automatically clean suspended solids. This makes the filter screen less prone to clogging due to the small size of the fibers and fine fibers that need to be filtered, which require very small pore sizes to achieve the desired removal effect. This ensures more complete filtration of suspended solids in wastewater, making it less likely that fibers and fine fibers will affect the degradation effect of the wastewater COD degradation device. Simultaneously, it also makes the filtration efficiency of the water collection tank less affected. Furthermore, it makes filter screen cleaning easier, requiring no additional manual maintenance.

[0029] 2. By setting a drive rod and limiting components, the baffle is less likely to re-close the drain hole due to changes in the direction of the elastic force of the elastic component. By driving the drive rod to the end above the filter screen, the switch plate is driven to open the drain hole, allowing the operator to drive the switch plate to open and close the drain hole from outside the water collection tank. The operation is simple and reduces the need for the operator to lift the filter screen to drive the switch plate to open the drain hole. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a wastewater COD degradation device.

[0031] Figure 2 This is a schematic diagram of the internal structure of a wastewater COD degradation device.

[0032] Figure 3 yes Figure 2 Enlarged view of part A in the image.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Degradation tank; 11. Inlet pipe; 2. Drain pipe; 3. Filter screen; 4. Water collection tank; 41. Blocking box; 42. Inflow box; 5. Baffle; 61. Flat plate; 62. Elastic component; 63. Limiting component; 64. Switch plate; 65. Driving component; 66. Sleeve; 67. Drain hole; 7. Water trough. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0036] This application discloses a wastewater COD degradation device. (Refer to...) Figure 1 as well as Figure 2 The system includes a degradation tank 1 placed on the ground and an inlet pipe 11 connected to the degradation tank 1. The horizontal height of the end of the inlet pipe 11 away from the degradation tank 1 is higher than the top of the degradation tank 1. The end of the inlet pipe 11 away from the degradation tank 1 is also connected to a collection tank 4, and the bottom of the collection tank 4 is connected to the inlet pipe 11. The top of the collection tank 4 is open, and a filter screen 3 covering the top opening is fixed inside the collection tank 4. The filter screen 3 is elastic. A drain pipe 2 for guiding wastewater to the collection tank 4 is also connected to the collection tank 4. The axis of the drain pipe 2 is parallel to the ground. The horizontal height of the connection point between the drain pipe 2 and the collection tank 4 is higher than that of the filter screen 3, while the horizontal height of the connection point between the inlet pipe 11 and the collection tank 4 is lower than that of the filter screen 3. The filter screen 3 is inclined downward from one end to the other, and the side wall of the collection tank 4 near the end with the lowest horizontal height of the filter screen 3 has an opening for the suspended matter on the filter screen 3 to be discharged to the outside of the collection tank 4. A water trough 7 is fixed outside the water collection tank 4. The water trough 7 is connected to the notch and the water trough 7 is connected to the box of the suspended solids collection process.

[0037] Reference Figure 1 The water collection tank 4 includes an inflow tank 42 connected to the end of the inflow pipe 11 away from the degradation tank 1, and a baffle tank 41 integrally connected to the inflow tank 42. The inflow tank 42 is an inverted quadrangular pyramid, with the apex of the inflow tank 42 connected to the end of the inflow pipe 11 away from the degradation tank 1. That is, all four side walls of the inflow tank 42 are inclined downwards towards the connection between the inflow pipe 11 and the inflow tank 42. The baffle tank 41 is a rectangular frame, with the ends of the four side walls of the baffle tank 41 near the inflow tank 42 integrally connected to the ends of the four side walls of the inflow tank 42 away from the inflow pipe 11. The papermaking wastewater flowing into the space of the water collection tank 4 flows into the degradation tank 1 through the inflow pipe 11.

[0038] Reference Figure 2 The length direction of the filter screen 3 is consistent with the length direction of the blocking box 41. The outer side wall of the filter screen 3 is fixedly connected to the inner side wall of the four sides of the blocking box 41, and the end of the filter screen 3 is close to the blocking box 41 and away from the inflow box 42.

[0039] Reference Figure 2The filter screen 3 is arc-shaped, with its arc surface protruding towards the baffle box 41. The drain pipe 2 is placed at the end of the filter screen 3 with a higher horizontal height, and there is a gap between the drain pipe 2 and the baffle box 41. The discharge hole at the lower horizontal height end of the filter screen 3 is arc-shaped and located at that end. The lower horizontal height end of the filter screen 3 is open to form a gap and connects to the water trough 7.

[0040] Reference Figure 2 as well as Figure 3 A baffle 5 is fixed to the side wall of the baffle box 41 near the lower horizontal height of the filter screen 3. The two adjacent sides of the baffle 5 are fixedly connected to the inner side wall of the baffle box 41 to form a water tank. The baffle 5 is inclined, and the inclination direction of the baffle 5 is the same as that of the filter screen 3. That is, the baffle 5 is inclined downward from the end near the water inlet pipe 11 toward the lowest point of the filter screen 3. The horizontal height of the highest point of the baffle 5 is higher than the horizontal height of the lowest point of the filter screen 3. A drain hole 67 is opened at the lowest point of the baffle 5. The drain hole 67 is square.

[0041] Reference Figure 3 A plate 61 is fixed to the side wall of the baffle box 41 connected to the lower end of the filter screen 3. The plate 61 is located on the side of the baffle 5 away from the filter screen 3. The plate 61 is perpendicular to the inner side wall of the end of the baffle box 41 near the lower end of the filter screen 3 along the length direction. The plate 61 is directly opposite the drain hole 67. The plate 61 is square and the side length of the plate 61 is longer than the side length of the drain hole 67.

[0042] Reference Figure 3 A switch plate 64 for opening and closing a drain hole 67 and an elastic element 62 for driving the switch plate 64 to always be pressed against the baffle 5 to close the drain hole 67 are movably connected to the side of the plate 61 near the baffle 5. The switch plate 64 is square, and the side length of the switch plate 64 is longer than the side length of the drain hole 67. The switch plate 64 and the drain hole 67 are directly opposite each other. In this embodiment, the elastic element 62 is a spring. One end of the elastic element 62 is fixedly connected to the side of the plate 61 near the switch plate 64, and the end of the elastic element 62 away from the plate 61 is fixedly connected to the side of the switch plate 64 near the plate 61. When the switch plate 64 abuts against the baffle 5 to close the drain hole 67, the elastic element 62 is in a compressed state.

[0043] Reference Figure 3 The plate 61 is also provided with a limiting member 63 that limits the linear movement of the switch plate 64. In this embodiment, the limiting member 63 includes a limiting rod fixed to the side of the plate 61 near the switch plate 64 and a groove recessed in the side of the switch plate 64 near the plate 61 for the limiting rod to be inserted. The limiting rod is cylindrical and perpendicular to the plate 61. There are four limiting rods.

[0044] Reference Figure 3The grooves are cylindrical, with the diameter of the grooves matching the diameter of the limiting rods. There are four grooves located at the four apex corners of the switch plate 6464, and the four limiting rods are respectively aligned with the four grooves. When the side of the baffle 5 near the filter screen 3 is not filled with water, the spring is compressed, and the switch plate 64 abuts against the baffle 5 to close the drain hole 67, with the limiting rods partially extending into the grooves. When the switch plate 64 moves toward the plate 61 to its limit position, a gap is left between the switch plate 64 and the plate 61, the spring is compressed, the switch plate 64 opens the drain hole 67, and the end of the limiting rod placed in the groove abuts against the bottom of the groove.

[0045] Reference Figure 2 as well as Figure 3 The baffle 5 is also provided with a driving component 65 that drives the switch plate 64 to open and close the drain hole 67. In this embodiment, the driving component 65 is a driving rod fixed to the side of the switch plate 64 away from the flat plate 61. The driving rod is cylindrical and perpendicular to the switch plate 64. The end of the driving rod away from the switch plate 64 extends out of the blocking box 41.

[0046] Reference Figure 2 as well as Figure 3 The filter screen 3 has a circular hole near its lower horizontal position for the drive rod to pass through, with the hole facing the switch plate 64. A sleeve 66 is also fixed to the lower horizontal position of the filter screen 3. The sleeve 66 is fixed to the inner wall of the circular hole and extends towards the side of the filter screen 3 away from the baffle 5. The sleeve 66 is cylindrical, with the outer diameter matching the diameter of the through hole and the inner diameter matching the diameter of the drive rod. The outer wall of the sleeve 66 is fixedly connected to the side wall of the circular hole. The end of the sleeve 66 away from the filter screen 3 is positioned outside the baffle box 41, while the end of the sleeve 66 near the filter screen 3 is flush with the side of the filter screen 3 near the switch plate 64. The drive rod moves within the sleeve 66. When the drive rod moves to the point where it abuts against the bottom of the groove, the end of the drive rod away from the switch plate 64 is positioned outside the baffle box 41, and a portion of this end protrudes beyond the sleeve 66.

[0047] The implementation principle of a wastewater COD degradation device according to an embodiment of this application is as follows:

[0048] When papermaking wastewater needs to be filtered, the wastewater is discharged from the drain pipe 2 into the filter screen 3. The mesh of the filter screen 3 is small, which prevents suspended solids in the wastewater from falling into the water collection tank 4. The suspended solids adhere to the side of the filter screen 3 near the drain pipe 2, and at the same time, they obstruct the flow of the wastewater. This causes some of the wastewater to remain temporarily on the side of the filter screen 3 near the drain pipe 2. The wastewater temporarily retained on the side of the filter screen 3 near the drain pipe 2 flows towards the lower part of the filter screen 3, which in turn drives the suspended solids attached to the filter screen 3 to flow towards the lower part of the filter screen 3. Papermaking wastewater flowing towards the end of filter screen 3 furthest from drain pipe 2 partially flows through filter screen 3 into inflow tank 42, and then along the inclined walls of inflow tank 42 towards the bottom, flowing into degradation tank 1 through inlet pipe 11 for COD degradation; part of it flows to the lower end of filter screen 3, where it is blocked by the side wall of baffle box 41, and flows down the side wall of baffle box 41 into the water tank formed by baffle 5 and the side wall of baffle box 41. When the water level in the water tank is higher than the lowest point of filter screen 3, the papermaking wastewater in the water tank submerges the suspended solids attached to the lower part of filter screen 3. The papermaking wastewater discharged from drain pipe 2 into filter screen 3 vibrates the elastic filter screen 3, causing it to vibrate. The vibration of filter screen 3 in conjunction with the vibration of the papermaking wastewater in the tank causes the suspended solids in the wastewater submerged in the tank to flow towards the lowest point of filter screen 3 and into the flow tank 7. This makes it less likely for suspended solids to adhere to filter screen 3 and cause it to become clogged. This reduces the situation where papermaking wastewater cannot easily pass through filter screen 3 due to suspended solids adhering to it and flows out to the lowest point of filter screen 3. This increases the amount of papermaking wastewater flowing into degradation tank 1, thereby increasing the amount of papermaking wastewater that has undergone COD degradation in degradation tank 1.

[0049] When the water level in the tank reaches a certain height, the water in the tank has a certain gravity, which makes it easier to overcome the elastic force of the elastic element 62 and squeeze the switch plate 64, causing the switch plate 64 to open the drain hole 67, allowing the water in the tank to be discharged through the drain hole 67. At the same time, when the water in the drain pipe 2 falls onto the filter screen 3, causing the filter screen 3 to vibrate, the papermaking wastewater in the tank will vibrate in conjunction with the filter screen 3. This makes it easier for the suspended solids at the lowest horizontal height of the filter screen 3 to be discharged with the water flow to the flow tank 7. As a result, while the papermaking wastewater in the tank carries the suspended solids at the bottom of the filter tank to the flow tank 7, some papermaking wastewater flows into the collection tank 4 through the drain outlet, reducing the amount of papermaking wastewater discharged into the flow tank 7, thereby increasing the amount of papermaking wastewater flowing into the degradation tank 1.

[0050] After the papermaking wastewater is filtered, the end of the drive rod above the filter screen 3 moves toward the plate 61, causing the drive rod to extend into the inner ring of the sleeve 66, thereby driving the switch plate 64 to move toward the plate 61. The switch plate 64 opens the drain hole 67, and the papermaking wastewater in the tank flows into the degradation tank 1. The operation is simple and reduces the need for the operator to lift the filter screen 3 to drive the switch plate 64 to open the drain hole 67.

[0051] By setting the drain pipe 2 higher than the inlet pipe 11, and installing a filter screen 3 between the drain pipe 2 and the inlet pipe 11, the filter screen 3 is arc-shaped. Papermaking wastewater is discharged from the drain pipe 2 into the filter screen 3. Under the action of gravity, the papermaking wastewater permeates the filter screen 3 and flows into the space of the collection tank 4. The filter screen 3 has small and dense mesh, which has an obstructive effect on the papermaking wastewater. The water droplets generated by the papermaking wastewater impacting the filter screen 3 are obstructed by the arc surface of the filter screen 3 and are not easy to bounce out of the filter screen 3 in the width direction, which helps to reduce the waste of papermaking wastewater that bounces out of the filter screen 3.

[0052] By setting the filter screen 3 to be tilted downwards, the filter screen 3 is elastic. A baffle 5 is set in the water collection tank 4 to form a water tank. A spring drives the switch plate 64 to open and close the drain hole 67 at the lowest point of the baffle 5. The tilted filter screen 3 causes the papermaking wastewater temporarily retained on the filter screen 3 to flow to the lower part of the filter screen 3. During the flow of the papermaking wastewater on the filter screen 3, the suspended solids attached to the filter screen 3 also flow to the lower part of the filter screen 3, making it less likely for the suspended solids to adhere to the filter screen 3 and cause clogging. This reduces the situation where the papermaking wastewater cannot easily pass through the filter screen 3 due to the suspended solids adhering to the filter screen 3 and flows out to the lowest point of the filter screen 3, thereby increasing the amount of papermaking wastewater flowing into the degradation tank 1, and thus increasing the amount of papermaking wastewater that has undergone COD degradation in the degradation tank 1. After the water level in the water tank is level with the lowest point of the filter screen 3, the suspended solids attached to the lower part of the filter screen 3 are submerged in the papermaking wastewater in the water tank. The papermaking wastewater discharged into the filter screen 3 by the drain pipe 2 impacts and vibrates, causing the papermaking wastewater in the linkage tank to agitate. This causes suspended solids in the papermaking wastewater submerged in the tank to be discharged to the lowest point of the filter screen 3 and flow into the flow tank 7. The linkage switch 64 in the tank switches between closing the drain hole 67 and opening the drain hole 67, causing part of the papermaking wastewater in the tank to flow towards the degradation tank 1. This reduces the amount of papermaking wastewater flowing into the flow tank 7 and increases the amount of papermaking wastewater flowing into the degradation tank 1, thereby increasing the amount of papermaking wastewater that has undergone COD degradation in the degradation tank 1. After the papermaking wastewater is filtered, the drive switch 64 can be activated to open the drain hole 67, discharging the papermaking wastewater in the tank into the degradation tank 1, reducing the waste caused by papermaking wastewater remaining in the tank.

[0053] By setting the driving component 65 and the limiting component 63, when the switch plate 64 moves to open or close the drain hole 67, the limiting component 63 restricts the movement of the switch plate 64 against the side wall where the baffle box 41 connects to the lower part of the filter screen 3. This prevents the baffle 5 from easily re-closing the drain hole 67 due to changes in the elastic force direction of the elastic component 62. After the papermaking wastewater is filtered, the driving component 65 is driven at the end higher than the filter screen 3 to open the drain hole 67. This allows the operator to open or close the drain hole 67 from outside the water collection tank 4, simplifying the operation and reducing the need for the operator to lift the filter screen 3 to open the switch plate 64 to open the drain hole 67.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wastewater COD degradation device, comprising a degradation box (1) placed on the ground and a water inlet pipe (11) in communication with the degradation box (1), characterized in that, The top of the water inlet pipe (11) is higher than the top of the degradation tank (1). The end of the water inlet pipe (11) away from the degradation tank (1) is connected to a water collection tank (4). The top of the water collection tank (4) is open, and a filter screen (3) covering the top opening is fixed inside the water collection tank (4). A drain pipe (2) for guiding wastewater into the water collection tank (4) is also connected to the water collection tank (4). The horizontal height of the connection between the drain pipe (2) and the water collection tank (4) is higher than that of the filter screen (3), and the horizontal height of the connection between the water inlet pipe (11) and the water collection tank (4) is lower than that of the filter screen (3). The filter screen (3) is inclined downward from one end to the other end, and a notch is opened at the connection between the water collection tank (4) and the lowest horizontal height of the filter screen (3) for the suspended matter filtered by the filter screen (3) to be discharged outside the water collection tank (4). The inner wall of the water collection tank (4) near the lowest horizontal height of the filter screen (3) is also provided with a baffle (5), and the baffle (5) and the inner wall of the water collection tank (4) form a water tank. The baffle (5) and the filter screen (3) are spaced apart, and the part of the filter screen (3) near the lowest horizontal height is placed in the water tank. The highest point of the baffle (5) is higher than the lowest point of the filter (3), and the filter (3) is elastic.

2. The wastewater COD degradation device according to claim 1, characterized in that, The vertical cross-section of the filter screen (3) is an arc surface, and the arc surface protrudes towards the connection between the water collection tank (4) and the water inlet pipe (11).

3. The wastewater COD degradation device according to claim 2, characterized in that, The bottom wall of the water collection tank (4) is inclined downwards towards the connection between the water inlet pipe (11) and the water collection tank (4).

4. The wastewater COD degradation device according to claim 1, characterized in that, The baffle (5) is inclined, and the inclination direction of the baffle (5) is consistent with the inclination direction of the filter screen (3).

5. The wastewater COD degradation device according to claim 1, characterized in that, The baffle (5) also has a drainage hole (67) at its lowest horizontal height, and the baffle (5) is also provided with a switch plate (64) for opening and closing the drainage hole (67).

6. The wastewater COD degradation device according to claim 5, characterized in that, The water collection tank (4) is also provided with an elastic element (62) that drives the switch plate (64) to always close the drain hole (67).

7. The wastewater COD degradation device according to claim 6, characterized in that, The baffle (5) is also provided with a drive component (65) for driving the switch plate (64) to open and close the drain hole (67). The end of the drive component (65) away from the baffle (5) extends out of the water collection tank (4).

8. The wastewater COD degradation device according to claim 7, characterized in that, The baffle (5) is also provided with a limiting member (63) that limits the movement of the switch plate (64) along the length direction of the elastic member (62).

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