Water recycling treatment system for hydroentanglement production line

Abstract

The application relates to a water circulation treatment system for a water jet production line, and relates to the field of wastewater multistage treatment, which comprises a rotary drum filter, a flocculation device, a multi-medium filter, an MBR membrane bioreactor, an ultrafiltration device and a pH adjusting tank, wherein the multi-medium filter comprises a shell, a plurality of filter material layers, an upper partition net, a lower partition net, a backwashing water cap plate and a transfer backwashing assembly, a through hole penetrating through the side wall of the shell is communicated to a transfer space, the transfer backwashing assembly enters the transfer space through the through hole, and a sealing cover for plugging the through hole is movably connected to the shell; the backwashing water cap plate is located at the bottom of the shell; the transfer backwashing assembly is provided with a backwater cavity and a backwashing cavity which are independent of each other, the backwashing cavity is communicated to the upper half of the transfer space, the backwater cavity is communicated to the lower half of the transfer space, the backwashing cavity is communicated with a discharge pipe, and the backwater cavity is communicated with a discharge pipe. The application can improve the backwashing effect of the filter material layers, so that the filtering effect of the multi-medium filter is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of multi-stage treatment of wastewater, in particular to a water recycling treatment system for a spunlace production line. BACKGROUND

[0002] Spunlace nonwoven fabric is a kind of fabric that is made by spraying high pressure micro-fine water flow to one or more fiber nets to make the fibers entangle with each other, so that the fiber net is reinforced to have certain strength.

[0003] The spunlace process relies on high pressure water needle (200-600bar) to impact the fiber net to entangle the fibers, which consumes a large amount of water (about 50-150 tons of water per ton of product), and the wastewater after spraying contains a large amount of fibers, oil agents, impurity particles, pigments, etc., so a water recycling treatment system is needed, which can reduce the water consumption by more than 90% through collection, filtration and purification for reuse, significantly saving production costs, or treating the wastewater to the discharge standard for discharge.

[0004] The existing water recycling treatment system includes a drum filter, a flocculation device, a multi-medium filter, an MBR membrane bioreactor, an ultrafiltration device and a pH adjusting tank. The existing multi-medium filter includes a shell, a plurality of filter material layers and a backwash water cap plate, the backwash water cap plate is located directly below the filter material layers, wastewater is discharged from the upper end of the shell, and the wastewater is filtered and adsorbed by the plurality of filter material layers in turn and discharged from the lower end of the shell.

[0005] After being used for a period of time, the filter material layers are blocked, the filtering and adsorbing effect is reduced, and the backwash water cap plate is backwashed upward, and the backwash water passes through each filter material layer in turn from bottom to top to flush away the impurities in the filter material layers and discharge from the upper end of the shell.

[0006] In order to ensure the filtering effect of the filter material layers, the filter material in the filter material layers is often relatively dense, and the filter material is also prone to be hardened due to impurities. Therefore, during the upward movement of the backwash water, the water pressure loss is large, and it is difficult for the backwash water to flush away the impurities in the filter material layers at a high position, and the impurities are also carried upward during the upward movement of the backwash water. When the upward movement path of the impurities is too long, the impurities are also easily intercepted by the filter material in the filter material layers at a high position, resulting in incomplete flushing of the impurities and high residual rate, which further affects the filtering effect of the filter after backwashing. SUMMARY

[0007] In order to improve the backwashing effect and improve the filtering effect, the present application provides a water recycling treatment system for a spunlace production line.

[0008] The water recycling treatment system for a spunlace production line provided by the present application adopts the following technical scheme:

[0009] The utility model provides a water circulation treatment system for water jet production line, including drum filter, flocculation device, multi -media filter, MBR membrane bioreactor, ultrafiltration device and pH adjusting pool in proper order, wherein, the multi -media filter includes the casing, a plurality of filter material layers, upper screen, lower screen, backwash water cap plate and transfer backwash assembly, the upper end of casing is equipped with water inlet pipe and blowdown pipe, and the lower end of casing is equipped with drain pipe, and each filter material layer is arranged with vertical interval, upper screen is attached to the upper surface of filter material layer, and lower screen is supported on the lower surface of filter material layer, and the vertical gap between adjacent lower screen and upper screen is transfer space, the lateral wall of casing is penetrated with through -hole that is connected to transfer space, and transfer backwash assembly enters transfer space through through -hole, and the casing is movably connected with sealing cover for blocking through -hole, backwash water cap plate is located at the bottom of casing, transfer backwash assembly has independent backwater cavity and backwash cavity, backwash cavity is communicated with the upper half of transfer space, backwater cavity is communicated with the lower half of transfer space, and backwash cavity is communicated with the discharge pipe, and backwater cavity is communicated with the discharge pipe.

[0010] By adopting the above technical scheme, when normal filtering, the transfer backwash assembly is not located in the transfer space, that is, the adjacent filter material layers are communicated, the sealing cover is blocked in the through -hole to ensure the sealing, the wastewater enters the casing from the water inlet pipe at the upper end of the casing, the wastewater is filtered and adsorbed by each filter material layer in turn, and finally the purified water is discharged from the drain pipe.

[0011] When backwashing, the sealing cover is removed, the transfer backwash assembly is horizontally moved into the transfer space through the through -hole, and the transfer backwash assembly divides the transfer space into two independent spaces, wherein, the backwash cavity is communicated with the upper half of the transfer space, and the backwater cavity is communicated with the lower half of the transfer space.

[0012] The specific backwashing steps for the filter material layer located between the backwash water cap plate and the adjacent transfer backwash assembly are as follows: the backwash water cap plate sprays backwash water upward, the backwash water carries the impurities in the filter material layer upward to the lower half of the transfer space, and finally the backwash water is discharged through the backwater cavity and the discharge pipe.

[0013] The specific backwashing steps for the filter material layer located between the adjacent two transfer backwash assemblies are as follows: the inlet pipe of the lower transfer backwash assembly is connected with backwash water, the backwash water is sprayed upward through the backwash cavity of the transfer backwash assembly, the backwash water carries the impurities in the filter material layer upward, the backwash water carrying the impurities enters the backwater cavity of the upper transfer backwash assembly, and finally the backwash water is discharged through the discharge pipe.

[0014] The specific backwashing steps for the uppermost filter material layer are as follows: the inlet pipe of the lower transfer backwash assembly is connected with backwash water, the backwash water is sprayed upward through the backwash cavity of the transfer backwash assembly, the backwash water carries the impurities in the filter material layer upward, and finally the backwash water carrying the impurities is discharged through the blowdown pipe at the top of the casing.

[0015] In summary, by setting the backwashing water cap plate and the plurality of movable transfer backwashing assemblies, the smoothness of normal filtration and adsorption can be ensured, and independent backwashing can be performed for each filter material layer. Since the moving path of the backwashing water is short, the water pressure loss is small, and the backwashing water can completely flush away the impurities with good water pressure maintenance. Moreover, since the moving path of the backwashing water is short, the probability of the impurities carried by the backwashing water being intercepted by the filter material is greatly reduced, thereby greatly reducing the residue of impurities in the filter material layer and further improving the backwashing cleaning effect. Secondly, since each filter material layer is independently backwashed, the filter materials of adjacent filter material layers are not easily mixed, so as to ensure the grading filtration effect. Finally, since each filter material layer is independently backwashed, the water pressure can be adjusted according to the filter material quality, specific gravity and particle size of each filter material layer, thereby further improving the backwashing effect.

[0016] Optionally, the transfer backwashing assembly comprises a transfer shell, the transfer shell is horizontally arranged, the transfer shell is horizontally slidably arranged in the shell body through the through hole, the transfer shell is provided with a horizontal partition plate, the partition plate divides the inner cavity of the transfer shell into the backwashing cavity and the backwater cavity arranged in upper and lower positions, and the inlet pipe and the outlet pipe are connected with the upper half part and the lower half part of the side wall of the transfer shell, respectively.

[0017] Optionally, the upper partition net and the lower partition net are arranged in an inclined manner, the lowest point of the lower partition net and the highest point of the upper partition net are arranged away from the through hole, and a supporting edge strip is welded and fixed to the inner wall of the shell body and supports the lowest point and the highest point of the lower partition net.

[0018] By adopting the above technical scheme, by arranging the upper partition net and the lower partition net, a relatively large transfer space can be defined between the filter material layers, so as to facilitate the entry and exit of the transfer shell. By arranging the upper partition net and the lower partition net in an inclined manner and arranging the supporting edge strip, the situation that the middle part of the lower partition net is deformed downward due to excessive load and interferes with the transfer shell can be reduced.

[0019] Optionally, the inner wall of the shell body is in a trapezoidal cross section, the outer shape of the transfer shell is matched with the inner wall cross section of the shell body, a sealing strip is fixed to the inner wall of the shell body and used for abutting the three side walls of the transfer shell, a first sealing embedded strip is fixed to the side wall of the transfer shell located outside the transfer space, and a matching chamfer is arranged on the edge of the through hole away from the transfer space and used for cooperating with the first sealing embedded strip.

[0020] By adopting the technical scheme, when the transfer shell is installed into the transfer space, the three side walls of the transfer shell are respectively attached to the sealing strips, so as to ensure the sealing effect of the transfer shell on the transfer space, and meanwhile, the first sealing embedded strip of the transfer shell is attached to the matching chamfer of the through hole, so as to seal the through hole and further improve the sealing effect, thereby ensuring the stability of the water pressure of the backwashing water.

[0021] Optionally, the sealing reinforcement structure is further arranged, the edge of the sealing cover is provided with a second sealing embedded strip, the shape of the second sealing embedded strip is consistent with the shape of the first sealing embedded strip, the sealing reinforcement structure comprises a pressing block and a bolt, the bolt is horizontally arranged, the bolt is threadedly connected with the outer wall of the shell, one end of the pressing block is connected with the bolt, and the other end of the pressing block abuts against the side wall of the sealing cover or the transfer shell away from the transfer space.

[0022] By adopting the technical scheme, the sealing reinforcement structure is arranged, when the bolt is screwed, the bolt drives the pressing block to move horizontally towards the shell, the pressing block abuts against the side wall of the sealing cover or the transfer shell away from the transfer space, so that the first sealing embedded strip or the second sealing embedded strip is further pressed against the matching chamfer, thereby further improving the sealing effect, and ensuring the stability of the water pressure of the backwashing water, and secondly, the installation stability of the transfer shell and the sealing cover is improved.

[0023] Optionally, the displacement driving structure is further arranged, the outer edge of the partition plate and the inner wall of the transfer shell have an activity gap, the outer edge of the partition plate and the inner wall of the transfer shell are connected through a rubber zigzag ring, the closed loop contour of the rubber zigzag ring is trapezoidal, the partition plate and the rubber zigzag ring jointly divide the inner cavity of the transfer shell into the backwashing cavity and the backwater cavity, the edge of the upper surface of the partition plate is fixed with two first connecting strips and two second connecting strips, the first connecting strips extend along the sliding direction of the transfer shell, the second connecting strips are perpendicular to the first connecting strips, the first connecting strips and the second connecting strips all have clamping grooves extending along the length direction of the first connecting strips and the second connecting strips, the inner wall of the transfer shell is fixed with two first elastic sheets and two second elastic sheets, the first elastic sheets and the second elastic sheets all have wave segments and bending segments, the end portions of the bending segments are slidably connected with the clamping grooves along the length direction of the clamping grooves, the upper surface of the partition plate is fixed with a rubber pipe, the upper end of the rubber pipe is fixed with the inner top wall of the transfer shell, the upper pipe opening of the rubber pipe is communicated with the backwashing hole, and the lower part of the rubber pipe is provided with a flow channel hole, the displacement driving structure comprises a sliding rod, a driving block and a driven block, the sliding rod is slidably connected with the transfer shell, the driving block is a circular block, the driving block is fixed to the end portion of the sliding rod, the driven block is provided in plurality, the driven block is fixed to the lower surface of the partition plate, the driven block is triangular, the driven blocks are arranged in staggered arrangement along the sliding direction of the sliding rod, two inclined surfaces of the driven block are respectively arranged as a first inclined surface and a second inclined surface, when the sliding rod advances, the outer circumferential surface of the driving block abuts against the first inclined surfaces of the driven blocks in sequence, and when the sliding rod retreats, the outer circumferential surface of the driving block abuts against the second inclined surfaces of the driven blocks in sequence.

[0024] By adopting the technical scheme, the partition plate and the rubber zigzag ring are arranged to jointly divide the inner cavity of the transfer shell into the backwashing cavity and the backwater cavity, the partition plate is movably connected with the transfer shell, the partition plate can be displaced relative to the transfer shell, the first elastic sheet and the second elastic sheet are respectively matched with the clamping grooves of the first connecting strip and the second connecting strip, the partition plate is elastically connected with the transfer shell, the partition plate can be reset after displacement through the elastic connection, and the sliding matching of the clamping grooves greatly improves the displacement freedom of the partition plate.

[0025] During the backwashing process, backwashing water is introduced into the pipe, the backwashing water enters the backwashing cavity, then enters the rubber pipe through the flow hole of the rubber pipe, and is sprayed out upward through the backwashing hole. During the process, the sliding rod is pushed forward, the outer circumferential surface of the driving block abuts against the first inclined surface of each driven block in turn, and the driven block and the partition plate are forced to make arc displacement in the horizontal plane (specifically, the partition plate is displaced along the length direction of the first connecting strip and the second connecting strip respectively, and the two displacements are superposed to form arc displacement) during abutment against a single first inclined surface. After abutment, the partition plate and the driven block are elastically reset. Since the driven blocks are arranged in a staggered manner, the arc displacement direction of the next driven block is opposite to that of the previous driven block, that is, the partition plate makes reciprocating arc displacement. Similarly, when the sliding rod retreats, the outer circumferential surface of the driving block abuts against the second inclined surface of each driven block in turn, and the partition plate also makes reciprocating arc displacement and the direction is opposite.

[0026] During the reciprocating arc displacement of the partition plate, the lower end of the rubber pipe is driven to make reciprocating arc displacement relative to the upper end of the rubber pipe, and the state of the rubber pipe continuously changes, thereby changing the spraying angle of the backwashing water to improve the backwashing range and the backwashing effect. Moreover, the spraying angle of the backwashing water continuously changes, the washing angle of the filter material continuously changes, thereby more completely washing the impurities and reducing the situation that the impurities are left due to the backwashing dead angle. In addition, the adjacent two backwashing water streams alternately intersect, the filter material at the same position can be backwashed at different angles, thereby further improving the washing effect. Finally, the upward path of the backwashing water in the filter material layer is more diversified, the permeation of the filter material at different positions is better, and the completeness of the entrainment of the impurities by the backwashing water is further improved.

[0027] Optionally, along the advancing direction of the sliding rod, the included angle between each first inclined surface and the straight line segment of the driven block gradually increases; along the retreating direction of the sliding rod, the included angle between each second inclined surface and the straight line segment of the driven block gradually increases; and along the advancing direction of the sliding rod, the shortest distance between the virtual path line of each driven block and the sliding rod gradually decreases.

[0028] By adopting the technical scheme, when the driving block abuts against the driven block, the displacement amount of the baffle along the length direction of the first connecting strip and the second connecting strip is changed respectively due to the different included angles of the first and second inclined surfaces at different positions and the different shortest distances between the driven blocks and the virtual path line of the sliding rod, so as to change the arc displacement path, and the different arc displacement paths make the rubber tube have different arc displacement paths each time, so that the change range and change frequency of the spray angle of the backwashing water each time are different, thereby further improving the backwashing range and backwashing effect, and the spray angle of the backwashing water changes continuously at a higher frequency, so that the washing angle of the filter material changes continuously at a high frequency, thereby being able to completely wash away impurities and reduce the situation that impurities are left due to the backwashing dead angle.

[0029] Optionally, the transfer backwashing assembly is provided as two, and the filter material layer is provided as three layers, the filter material of the first layer filter material layer is in turn anthracite and coarse quartz from top to bottom, wherein the particle size of the anthracite is 1-2 mm, and the particle size of the coarse quartz is 0.8-1.2 mm, the filter material of the second layer filter material layer is medium quartz, and the particle size of the medium quartz is 0.5-0.8 mm; the filter material of the third layer filter material layer is fine quartz, and the particle size of the fine quartz is 0.3-0.5 mm.

[0030] Optionally, the filter material surface of the filter material layer is coated with nano-SiO2.

[0031] By adopting the technical scheme, the nano-SiO2 can improve the smoothness and anti-pollution of the filter material surface, and the hydrophilicity is enhanced, so that the amount of oil stains attached is reduced.

[0032] In summary, the present application has at least one of the following beneficial technical effects:

[0033] By arranging the backwashing water cap plate and the plurality of movable transfer backwashing assemblies, the smoothness of normal filtration and adsorption can be ensured, and each filter material layer can be independently backwashed. Since the moving path of the backwashing water is short, the water pressure loss is small, and the backwashing water with good water pressure can completely flush away impurities. Moreover, since the moving path of the backwashing water is short, the probability of impurities carried by the backwashing water being intercepted by the filter material is greatly reduced, thereby greatly reducing the residue of impurities in the filter material layer and further improving the backwashing cleaning effect. Secondly, since each filter material layer is independently backwashed, the filter material of adjacent filter material layers is not easily mixed, so as to ensure the grading filtration effect. Finally, since each filter material layer is independently backwashed, the water pressure can be adjusted according to the filter material quality, specific gravity and particle size of each filter material layer, thereby further improving the backwashing effect.

[0034] By setting the displacement driving structure, the baffle will drive the lower end of the rubber tube to reciprocate arc displacement relative to the upper end of the rubber tube during the reciprocating arc displacement process of the baffle, and the state of the rubber tube changes continuously, thereby changing the backwashing water injection angle, improving the backwashing range and improving the backwashing effect. Moreover, the backwashing water injection angle changes continuously, so that the washing angle of the filter material changes continuously, thereby more completely washing impurities and reducing the situation of impurity residues caused by backwashing dead angle. Moreover, the adjacent two backflushing water cross each other, and the filter material at the same position can be backwashed at different angles, thereby improving the washing effect. Finally, the upward path of the backwashing water in the filter material layer is more diverse, the permeation of the filter material at different positions is better, and the completeness of the backwashing water carrying impurities is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of each device of the overall system of embodiment 1.

[0036] Figure 2 is a sectional view of the multi-medium filter of embodiment 1.

[0037] Figure 3 is Figure 2 is a partial enlarged view at A in FIG.

[0038] Figure 4 is a cross-sectional view of the shell of embodiment 1.

[0039] Figure 5 is a schematic diagram of the sealing cover of embodiment 1.

[0040] Figure 6 is a schematic diagram of the transfer shell of embodiment 1.

[0041] Figure 7 is a sectional view of the transfer shell of embodiment 1.

[0042] Figure 8 is a schematic diagram of the upper surface structure of the baffle of embodiment 2.

[0043] Figure 9 is a sectional view of the transfer shell of embodiment 2.

[0044] Figure 10 is Figure 9 is a partial enlarged view at B in FIG.

[0045] Figure 11 is a schematic diagram of the lower surface of the baffle of embodiment 2.

[0046] Figure 12 is a schematic diagram of the lower surface of the baffle of embodiment 3.

[0047] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Transfer shell; 10. Filter media layer; 100. Transfer space; 101. Through hole; 1011. Chamfered edge; 11. Inlet pipe; 12. Drain pipe; 13. Outlet pipe; 14. Backwash cap plate; 15. Lower partition screen; 16. Upper partition screen; 17. Sealing cover; 171. Connecting rope; 172. Second sealing insert strip; 18. Bolt; 181. Pressure block; 182. Sealing strip; 19. Supporting edge strip; 21. Backwash chamber; 211. Backwash hole; 22. Return water chamber; 221. Return water hole; 23. Baffle plate; 231. Rubber corrugated ring; 232. First connecting strip; 233. Second connecting strip; 2331. Slot; 235. First spring piece; 236. Second spring piece; 2361. Corrugated section; 2362. Bent section; 237. Rubber tube; 2371. Flow channel hole; 24. Discharge pipe; 25. Inlet pipe; 26. First sealing embedded strip; 27. Perforation; 31. Slide rod; 32. Drive block; 33. Driven block; 331. First inclined surface; 332. Second inclined surface. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1 -Appendix Figure 12 This application will be described in further detail.

[0049] Example 1 discloses a water circulation treatment system for a spunlace production line. (Refer to...) Figure 1 The water circulation treatment system for the spunlace production line includes, in sequence, a drum filter, a flocculation device, a multi-media filter, an MBR membrane bioreactor, an ultrafiltration device, and a pH adjustment tank. The drum filter removes fiber debris and large particulate suspended solids. The flocculation device can use polyaluminum chloride coagulant at a dosage of 50-100 mg / L. The multi-media filter further removes suspended solids and adsorbs some COD. The MBR membrane bioreactor degrades dissolved CDD and simultaneously removes nitrogen and phosphorus. The ultrafiltration device intercepts bacteria and colloids, resulting in an effluent turbidity of less than 0.5 NTU and a further reduction in COD to below 30 mg / L to meet reuse standards.

[0050] like Figure 2 , Figure 3 , Figure 4 As shown ( Figure 2The middle solid arrow is the wastewater flow direction, and the dotted arrow is the backwashing water flow direction, the multi-medium filter comprises a shell 1, a plurality of filter material layers 10, an upper separation net 16, a lower separation net 15, a backwashing water cap plate 14 and a transfer backwashing assembly, the shell 1 is vertical, the inner wall of the shell 1 is in a trapezoidal cross section, the upper end of the shell 1 is connected with a three-way pipe and a valve (not marked in the figure), two pipe heads of the three-way pipe are respectively an inlet pipe 11 and a blow-off pipe 12, the lower end of the shell 1 is provided with a drain pipe 13, the filter material layers 10 are vertically and spaced apart, the filter material layers 10 are provided in three layers, the filter material of the first layer of filter material layers 10 is in turn anthracite and coarse quartz from top to bottom, the particle size of the anthracite is 1-2 mm, the particle size of the coarse quartz is 0.8-1.2 mm, the filter material of the second layer of filter material layers 10 is medium quartz, the particle size of the medium quartz is 0.5-0.8 mm, the filter material of the third layer of filter material layers 10 is fine quartz, the particle size of the fine quartz is 0.3-0.5 mm, in order to improve the smoothness and anti-pollution of the filter material surface, nano-SiO2 can be coated on the surface of each filter material.

[0051] In order to ensure the position stability of each filter material layer 10, a bearing edge 19 is welded and fixed to the inner wall of the shell 1, the bearing edge 19 bears the two sides of the lower separation net 15, so that the lower separation net 15 is supported on the lower surface of the filter material layer 10, and the upper separation net 16 is attached to the upper surface of the filter material layer 10, the vertical gap between the adjacent lower separation net 15 and the upper separation net 16 is set as a transfer space 100, that is, the adjacent two filter material layers 10 each have a transfer space 100, and the side wall of the shell 1 is penetrated by a through hole 101 which is communicated to the transfer space 100.

[0052] In addition, the upper separation net 16 and the lower separation net 15 are both inclined, the lowest point of the lower separation net 15 and the highest point of the upper separation net 16 are both arranged away from the through hole 101.

[0053] The shell 1 is movably connected with a sealing cover 17 for plugging the through hole 101, specifically, as shown in Figure 3 , Figure 5 the sealing cover 17 is rectangular, the sealing cover 17 is fixed to the outer side of the shell 1 through a connecting rope 171, a second sealing embedded strip 172 is fixed at the outer edge of the sealing cover 17, and the edge of the hole opening of the through hole 101 away from the transfer space 100 is provided with a matched chamfer 1011 matched with the second sealing embedded strip 172.

[0054] The shell 1 is also provided with a sealing reinforcement structure, the sealing reinforcement structure comprises a pressing block 181 and a bolt 18, the bolt 18 is horizontally arranged, the bolt 18 is threadedly connected with the outer wall of the shell 1, one end of the pressing block 181 is connected with the bolt 18, the connection can be fixed connection or penetrating connection, and the screw head of the bolt 18 is pressed on the surface of the pressing block 181, and the other end of the pressing block 181 abuts against the side wall of the sealing cover 17 away from the transfer space 100.

[0055] The backwashing water cap plate 14 is located at the bottom of the shell 1, and the water cap of the backwashing water cap plate 14 is arranged upwards. The backwashing water cap plate 14 can be hollow to facilitate the downward passage of purified water.

[0056] During normal filtration, the transfer backwashing assembly is not located in the transfer space 100, that is, the adjacent filter material layers 10 are in communication, the sealing cover 17 is blocked in the through hole 101 to ensure the sealing, then the bolt 18 is screwed, the pressing block 181 is driven to move horizontally towards the shell 1, and the pressing block 181 abuts against the side wall of the sealing cover 17 away from the transfer space 100, so that the second sealing embedded strip 172 is further pressed and fitted with the chamfer 1011 to improve the installation stability of the sealing cover 17. Then the wastewater enters the shell 1 from the water inlet pipe 11 at the upper end of the shell 1, and the wastewater is filtered and adsorbed by each filter material layer 10 in turn, and finally the purified water is discharged from the drain pipe 13.

[0057] The transfer backwashing assembly is provided with two transfer backwashing assemblies, and the transfer backwashing assembly can enter the transfer space 100 through the through hole 101. Specifically, as shown in Figure 4 、 Figure 6 、 Figure 7 The transfer backwashing assembly includes a transfer shell 2, an inlet pipe 25 and an outlet pipe 24. The transfer shell 2 is horizontally arranged, and the shape of the transfer shell 2 is matched with the cross section of the inner wall of the shell 1. The transfer shell 2 is horizontally slidably arranged in the shell 1 through the through hole 101. The transfer shell 2 is fixedly provided with a horizontal partition plate 23. The partition plate 23 divides the inner cavity of the transfer shell 2 into an upper backwashing cavity 21 and a lower water return cavity 22. The backwashing cavity 21 and the water return cavity 22 are independent of each other. A plurality of backwashing holes 211 are formed through the upper surface of the transfer shell 2, and a plurality of water return holes 221 are formed through the lower surface of the transfer shell 2, so that the backwashing cavity 21 is in communication with the upper half of the transfer space 100, and the water return cavity 22 is in communication with the lower half of the transfer space 100.

[0058] The inlet pipe 25 and the outlet pipe 24 are connected with the upper half and the lower half of the side wall of the transfer shell 2 respectively, and the inlet pipe 25 and the outlet pipe 24 are arranged in a staggered manner. The inlet pipe 25 is in communication with the backwashing cavity 21, and the outlet pipe 24 is in communication with the water return cavity 22.

[0059] In order to improve the sealing of the transfer shell 2 in the shell 1, the following arrangement is made, as shown in Figure 3 、 Figure 4 A sealing strip 182 is fixedly arranged on the inner wall of the shell 1. A first sealing embedded strip 26 is fixedly arranged on the side wall of the transfer shell 2 outside the transfer space 100. The shape of the first sealing embedded strip 26 is consistent with the shape of the second sealing embedded strip 172.

[0060] When backwashing is needed, the bolt 18 is loosened, the pressing block 181 is moved away from the sealing cover 17, the transfer shell 2 is installed into the transfer space 100 through the through hole 101, at this time, the three side walls of the transfer shell 2 are respectively attached to the sealing strips 182 to ensure the sealing effect of the transfer shell 2 on the transfer space 100, and the first sealing embedded strip 26 of the transfer shell 2 is attached to the matching chamfer 1011 of the through hole 101 to seal the through hole 101, then the bolt 18 is tightened, the bolt 18 drives the pressing block 181 to move horizontally towards the shell 1, and the pressing block 181 abuts against the side wall of the transfer shell 2 away from the transfer space 100, so that the first sealing embedded strip 26 is further pressed against the matching chamfer 1011.

[0061] After the installation of the transfer shell 2, the backwashing cavity 21 of the transfer shell 2 is in communication with the upper half of the transfer space 100, and the backwater cavity 22 is in communication with the lower half of the transfer space 100.

[0062] The specific backwashing steps for the third filter material layer 10 are that the backwashing water cap plate 14 sprays backwashing water upward, the backwashing water carries the impurities in the filter material layer 10 upward to the lower half of the transfer space 100, and finally is discharged through the backwater cavity 22 and the discharge pipe 24.

[0063] The specific backwashing steps for the filter material layer 10 (the second filter material layer 10) between the adjacent two transfer backwashing assemblies are that the inlet pipe 25 of the lower transfer shell 2 is connected to the backwashing water, the backwashing water is sprayed upward through the backwashing cavity 21 and the backwashing hole 211 of the transfer shell 2, the backwashing water carries the impurities in the filter material layer 10 upward, the backwashing water carrying the impurities enters the backwater cavity 22 of the upper transfer shell 2, and finally is discharged through the discharge pipe 24.

[0064] The specific backwashing steps for the uppermost filter material layer 10 (the first layer) are that the inlet pipe 25 of the transfer shell 2 below the filter material layer 10 is connected to the backwashing water, the backwashing water is sprayed upward through the backwashing cavity 21 and the backwashing hole 211 of the transfer shell 2, the backwashing water carries the impurities in the filter material layer 10 upward, and finally the backwashing water carrying the impurities is discharged through the exhaust pipe 12 at the top of the shell 1.

[0065] In this way, by arranging the backwashing water cap plate 14 and the plurality of movable transfer backwashing assemblies, the smoothness of normal filtration and adsorption can be ensured, and each filter material layer 10 can be independently backwashed. Since the moving path of the backwashing water is short, the water pressure loss is small, and the backwashing water with good water pressure can completely flush away the impurities.

[0066] Moreover, since the moving path of the backwashing water is short, the probability of the impurities carried by the backwashing water being intercepted by the filter material is greatly reduced, thereby greatly reducing the residue of the impurities in the filter material layer 10 and further improving the backwashing cleaning effect.

[0067] Secondly, since each filter layer 10 is independently backwashed, the adjacent filter layers 10 are not prone to filter mixing, thereby ensuring the gradation filtering effect.

[0068] Finally, since each filter layer 10 is independently backwashed, the water pressure can be adjusted according to the filter material, specific gravity and particle size of each filter layer 10, thereby further improving the backwashing effect.

[0069] Example 2, which is different from example 1, as shown in Figure 8 、 Figure 9 、 Figure 10 The outer edge of the partition plate 23 and the inner wall of the transfer shell 2 have a movable gap, the outer edge of the partition plate 23 and the inner wall of the transfer shell 2 are connected through the rubber zigzag ring 231, the closed loop profile of the rubber zigzag ring 231 is trapezoidal, the partition plate 23 and the rubber zigzag ring 231 together divide the inner cavity of the transfer shell 2 into the backwashing cavity 21 and the backwater cavity 22, the rubber zigzag ring not only plays a sealing role, but also enables the partition plate 23 to displace relative to the transfer shell 2.

[0070] Two first connecting strips 232 and two second connecting strips 233 are fixed at the edge of the upper surface of the partition plate 23, wherein the first connecting strip 232 extends along the sliding direction of the transfer shell 2, and the second connecting strip 233 is perpendicular to the first connecting strip 232, both the first connecting strip 232 and the second connecting strip 233 have a clamping groove 2331 extending along the length direction thereof; two first elastic sheets 235 and two second elastic sheets 236 are fixed to the inner wall of the transfer shell 2, the first elastic sheet 235 is correspondingly arranged with the first connecting strip 232, and the second elastic sheet 236 is correspondingly arranged with the second connecting strip 233, both the first elastic sheet 235 and the second elastic sheet 236 have a wave section 2361 and a bent section 2362, the end of the wave section 2361 is fixed to the inner wall of the transfer shell 2, and the end of the bent section 2362 is slidably connected with the clamping groove 2331 along the length direction of the clamping groove 2331.

[0071] The wave section 2361 has an easy elastic deformation property, so as to improve the elasticity of the first elastic sheet 235 and the second elastic sheet 236 along the length direction thereof, the partition plate 23 is elastically connected with the transfer shell 2, and after the displacement of the partition plate 23, the partition plate 23 can be reset through the elastic connection, and the bent section 2362 plays a connecting role, so as to ensure a large displacement freedom degree of the partition plate 23 in the horizontal plane.

[0072] A rubber pipe 237 is fixed to the upper surface of the partition plate 23, the upper end of the rubber pipe 237 is fixed to the inner top wall of the transfer shell 2, the upper pipe opening of the rubber pipe 237 is communicated with the backwashing hole 211, and the lower part of the rubber pipe 237 is provided with a flow channel hole 2371, when the partition plate 23 is at the central position of the transfer shell 2, the rubber pipe 237 is in a vertical state.

[0073] The transfer backwashing assembly further comprises a displacement driving structure, as shown in Figure 9 、 Figure 11 The displacement driving structure comprises a slide rod 31, a driving block 32 and a driven block 33. The slide rod 31 is in sliding fit with the transfer shell 2. Specifically, the side wall of the backwater cavity 22 of the transfer shell 2 is provided with a through hole 27, and the slide rod 31 is in sliding fit with the through hole 27. In other embodiments, the transfer shell 2 can be fixed with a slide pipe coaxial with the through hole 27, and the slide rod 31 passes through the slide pipe. The driving source of the slide rod 31 can be manual pushing or an electric push rod installed on the outer wall of the transfer shell 2.

[0074] The driving block 32 is a circular block fixed to the end of the slide rod 31. The driven block 33 is provided in plurality and fixed to the lower surface of the partition plate 23. In this embodiment, the driven block 33 is an isosceles triangle, and each driven block 33 is arranged in staggered manner along the sliding direction of the slide rod 31. The two inclined surfaces of the driven block 33 are respectively set as the first inclined surface 331 and the second inclined surface 332.

[0075] During backwashing, backwashing water is introduced into the discharge pipe 25, enters the backwashing cavity 21, then enters the rubber pipe 237 through the flow hole 2371 of the rubber pipe 237, and is sprayed out through the backwashing hole 211. During this process, the slide rod 31 is pushed forward, and the outer peripheral surface of the driving block 32 abuts against the first inclined surface 331 of each driven block 33 in turn. During abutment against a single first inclined surface 331, the driving block 32 forces the driven block 33 and the partition plate 23 to make an arc displacement in the horizontal plane (specifically, the partition plate 23 makes a displacement along the length direction of the first connecting strip 232 and the second connecting strip 233, and the two displacements are superimposed to form an arc displacement). After abutment, the partition plate 23 and the driven block 33 are elastically reset. Since each driven block 33 is arranged in staggered manner, the arc displacement direction of the next driven block 33 is opposite to that of the previous driven block 33, i.e., the partition plate 23 makes a reciprocating arc displacement. Similarly, when the slide rod 31 retreats, the outer peripheral surface of the driving block 32 abuts against the second inclined surface 332 of each driven block 33 in turn, and the partition plate 23 also makes a reciprocating arc displacement with opposite direction.

[0076] During the reciprocating arc displacement of the partition plate 23, the partition plate 23 drives the lower end of the rubber pipe 237 to make a reciprocating arc displacement relative to the upper end of the rubber pipe 237. The state of the rubber pipe 237 changes continuously, thereby changing the spraying angle of the backwashing water to improve the backwashing range and the backwashing effect.

[0077] Moreover, the spraying angle of the backwashing water changes continuously, so that the washing angle of the filter material changes continuously, thereby being able to wash the impurities more completely and reduce the situation that impurities are left due to backwashing dead angle. Moreover, the adjacent two backwashing water streams are easy to interact and cross, so that the filter material at the same position can be backwashed at different angles, thereby improving the washing effect.

[0078] Finally, the reverse washing water has more diverse moving paths in the filter material layer 10, and the permeation of different positions of the filter material layer 10 is better, which further improves the complete entrainment of impurities by the reverse washing water.

[0079] Embodiment 3, which is different from Embodiment 2, limits the shape and position of the driven block 33, as shown in Figure 12 The angle between each first inclined surface 331 and the straight line segment of the driven block 33 gradually increases in the advancing direction of the slide rod 31; the angle between each second inclined surface 332 and the straight line segment of the driven block 33 gradually increases in the retreating direction of the slide rod 31; and the shortest distance between each driven block 33 and the virtual path line of the slide rod 31 gradually decreases in the advancing direction of the slide rod 31.

[0080] When the driving block 32 abuts against the driven block 33, the different angles of the first inclined surface 331 and the second inclined surface 332 at different positions and the different shortest distances between each driven block 33 and the virtual path line of the slide rod 31 will change the displacement amount of the baffle 23 along the length direction of the first connecting strip 232 and the second connecting strip 233, respectively, thereby changing the arc displacement path, and the different arc displacement paths will make the arc displacement path of the rubber tube 237 different each time, so that the range and frequency of the spray angle of the reverse washing water change each time, thereby further improving the reverse washing range and the reverse washing effect.

[0081] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A water circulation treatment system for a spunlace production line, characterized in that: The system comprises, in sequence, a rotary drum filter, a flocculation device, a multi-media filter, an MBR membrane bioreactor, an ultrafiltration device, and a pH adjustment tank. The multi-media filter includes a shell (1), multiple filter media layers (10), an upper partition (16), a lower partition (15), a backwash cap plate (14), a transfer backwash assembly, and a displacement drive structure. The upper end of the shell (1) is provided with an inlet pipe (11) and a drain pipe (12), and the lower end of the shell (1) is provided with a drain pipe (13). The filter media layers (10) are arranged vertically at intervals. The upper partition (16) is attached to the upper surface of the filter media layer (10), and the lower partition (15) is supported on the lower surface of the filter media layer (10). The adjacent lower partition (15) and upper partition (16) are connected... The vertical gap between them is set as a transfer space (100); the side wall of the housing (1) has a through hole (101) that connects to the transfer space (100), and the transfer backwash assembly enters the transfer space (100) through the through hole (101). The housing (1) is movably connected with a sealing cover (17) for sealing the through hole (101); the backwash water cap plate (14) is located at the bottom of the housing (1); the transfer backwash assembly has an independent return water chamber (22) and a backwash chamber (21). The backwash chamber (21) is connected to the upper part of the transfer space (100), and the return water chamber (22) is connected to the lower part of the transfer space (100). The backwash chamber (21) is connected to an inlet pipe (25). The cavity (22) is connected to the discharge pipe (24); the transfer backwash assembly includes a transfer shell (2), which is horizontally arranged and slides horizontally with the shell (1) through the through hole (101). A horizontally arranged partition (23) is provided inside the transfer shell (2), which divides the inner cavity of the transfer shell (2) into the backwash cavity (21) and the return water cavity (22) arranged vertically. There is an movable gap between the outer edge of the partition (23) and the inner wall of the transfer shell (2), and the outer edge of the partition (23) is connected to the inner wall of the transfer shell (2) through a rubber corrugated ring (231). Two first-order second-order third-order third-order third-order fourth-order fifth ... A connecting strip (232) and two second connecting strips (233) are provided, wherein the first connecting strip (232) extends along the sliding direction of the transfer shell (2), and the second connecting strips (233) are perpendicular to the first connecting strip (232). Both the first connecting strip (232) and the second connecting strip (233) have a slot (2331) extending along their own length direction. Two first spring pieces (235) and second spring pieces (236) are fixed to the inner wall of the transfer shell (2). Both the first spring pieces (235) and the second spring pieces (236) have a wave section (2361) and a bent section (2362). The end of the bent section (2362) slides and engages with the slot (2331) along the length direction of the slot (2331).A rubber tube (237) is fixed to the upper surface of the partition (23). The upper end of the rubber tube (237) is fixed to the inner top wall of the transfer shell (2). The upper opening of the rubber tube (237) is connected to the backwash hole (211). A flow channel hole (2371) is opened in the lower part of the rubber tube (237). The displacement driving structure includes a slide rod (31), a driving block (32), and a driven block (33). The slide rod (31) slides horizontally with the transfer shell (2). The driving block (32) is a round block. The driving block (32) is fixed to the end of the slide rod (31). The driven block (33) is set as Multiple driven blocks (33) are fixed to the lower surface of the partition (23). Each driven block (33) is triangular and staggered along the sliding direction of the slide bar (31). The two inclined surfaces of each driven block (33) are designated as the first inclined surface (331) and the second inclined surface (332). When the slide bar (31) moves forward, the outer circumferential surface of the driving block (32) abuts against the first inclined surface (331) of each driven block (33). When the slide bar (31) moves backward, the outer circumferential surface of the driving block (32) abuts against the second inclined surface (332) of each driven block (33).

2. The water circulation treatment system for a hydroentangled production line according to claim 1, characterized in that: The inlet pipe (25) and the outlet pipe (24) are respectively connected to the upper half and the lower half of the side wall of the transfer shell (2); the upper surface of the transfer shell (2) is provided with multiple backwash holes (211), and the lower surface of the transfer shell (2) is provided with multiple return water holes (221).

3. The water circulation treatment system for a hydroentangled production line according to claim 2, characterized in that: The upper partition (16) and the lower partition (15) are both inclined. The lowest point of the lower partition (15) and the highest point of the upper partition (16) are both far away from the through hole (101). A supporting strip (19) is welded and fixed to the inner wall of the housing (1). The supporting strip (19) supports the lowest point and the highest point of the lower partition (15).

4. The water circulation treatment system for a spunlace production line according to claim 2, characterized in that: The inner wall of the housing (1) has a trapezoidal cross-section. The shape of the transfer shell (2) is adapted to the inner wall cross-section of the housing (1). A sealing strip (182) is fixed to the inner wall of the housing (1). The sealing strip (182) is used to fit against the three sides of the transfer shell (2). A first sealing embedding strip (26) is fixed to the side wall of the transfer shell (2) located outside the transfer space (100). The edge of the through hole (101) away from the transfer space (100) is provided with a chamfer (1011) for cooperating with the first sealing embedding strip (26).

5. The water circulation treatment system for a hydroentangled production line according to claim 4, characterized in that: It also includes a sealing reinforcement structure. The edge of the sealing cover (17) is provided with a second sealing embedding strip (172). The shape of the second sealing embedding strip (172) is consistent with the shape of the first sealing embedding strip (26). The sealing reinforcement structure includes a pressure block (181) and a bolt (18). The bolt (18) is horizontally arranged and threaded to the outer wall of the housing (1). One end of the pressure block (181) is connected to the bolt (18), and the other end of the pressure block (181) abuts against the side wall of the sealing cover (17) or the transfer shell (2) away from the transfer space (100).

6. The water circulation treatment system for a hydroentangled production line according to claim 2, characterized in that: The closed-loop profile of the rubber corrugated ring (231) is trapezoidal. The partition (23) and the rubber corrugated ring (231) together divide the inner cavity of the transfer shell (2) into the backwash chamber (21) and the return water chamber (22).

7. The water circulation treatment system for a hydroentangled production line according to claim 6, characterized in that: Along the forward direction of the slide bar (31), the angle between the straight segments of each of the first inclined surfaces (331) and the driven block (33) gradually increases; along the backward direction of the slide bar (31), the angle between the straight segments of each of the second inclined surfaces (332) and the driven block (33) gradually increases; along the forward direction of the slide bar (31), the shortest distance between each driven block (33) and the virtual path line of the slide bar (31) gradually decreases.

8. The water circulation treatment system for a hydroentangled production line according to claim 1, characterized in that: The transfer backwashing assembly is configured in two parts, and the filter media layer (10) is configured in three layers. The filter media of the first layer (10) are anthracite and coarse quartz from top to bottom, wherein the anthracite has a particle size of 1-2 mm and the coarse quartz has a particle size of 0.8-1.2 mm. The filter media of the second layer (10) is medium quartz with a particle size of 0.5-0.8 mm. The filter media of the third layer (10) is fine quartz with a particle size of 0.3-0.5 mm.

9. The water circulation treatment system for a hydroentangled production line according to claim 1, characterized in that: The filter media surface of the filter media layer (10) is coated with nano-SiO2.

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