A filtering and recycling device for alkaline-containing wastewater

Abstract

The utility model discloses a kind of filtering recovery devices of alkali-containing wastewater, including fixed bottom plate, the top surface middle part of the fixed bottom plate is fixed with lower support shell, the top surface middle part of the top plate of lower support shell is profiled with upper installation groove, the lower part of upper box body is inserted in upper installation groove, the bottom surface of the bottom plate of upper box body is pressed in the bottom surface of upper installation groove, the outer side wall of the bottom of upper box body is close to or close to the inner side wall of upper installation groove, the top plate of upper box body is fixedly connected on the top plate of lower support shell by bolt, the top surface middle part of the bottom plate of upper box body is fixed with placing rack, the top surface side of the top plate of placing rack is fixed with rectangular limit frame, the lower part of feed box body is inserted in rectangular limit frame;It can be filtered after wastewater is filtered multiple times, sodium hydroxide and water liquid can be discharged from first liquid discharge pipe by alkali-resistant nanofiltration membrane filter element, realize collection and reuse, improve the recycling of alkali, reduce the use of acid, environmental protection effect is good, simultaneously, reduce processing cost.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, and more specifically to a filtration and recovery device for alkaline wastewater. Background Technology

[0002] In industries such as textiles and papermaking, alkaline wastewater is a common type of industrial wastewater. Conventional recovery methods typically involve neutralizing the wastewater with acid before discharging it as wastewater. This prevents the effective utilization of the alkaline components in the wastewater and also wastes a significant amount of acid.

[0003] In fact, the alkaline components in this wastewater can be reused. Directly neutralizing and discharging it now not only wastes a lot of acid, but also makes it impossible to reuse the alkaline components in the wastewater. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a filtration and recovery device for alkaline wastewater. It can filter the wastewater multiple times and then discharge the alkali such as sodium hydroxide and water through the first drain pipe using an alkali-resistant nanofiltration membrane filter element, so as to achieve collection and reuse, improve the recovery and utilization of alkali, reduce the use of acid, have good environmental protection effect, and at the same time reduce the treatment cost.

[0005] The solution of this utility model to the aforementioned technical problem is:

[0006] A filtration and recovery device for alkaline wastewater includes a fixed base plate. A lower support shell is fixed to the center of the top surface of the fixed base plate. An upper mounting groove is formed in the center of the top surface of the top plate of the lower support shell. The lower part of an upper housing is inserted into the upper mounting groove. The bottom surface of the bottom plate of the upper housing presses against the bottom surface of the upper mounting groove. The outer side wall of the bottom of the upper housing is close to or near the inner side wall of the upper mounting groove. The bottom plate of the upper housing is fixedly connected to the top plate of the lower support shell by bolts. A placement frame is fixed to the center of the top surface of the bottom plate of the upper housing. A rectangular limiting frame is fixed to the edge of the top surface of the top plate of the placement frame. The lower part of the feed box is inserted into the rectangular limiting frame, and its bottom surface presses against the top surface of the top plate of the placement frame. The feed box is fixed on the placement frame.

[0007] A liquid inlet pipe is connected to the upper side plate of the feeding box. The lower part of the left and right side plates of the feeding box is formed with a discharge through hole. A coarse filter screen is installed inside the feeding box. After the wastewater is filtered by the coarse filter screen, it flows out from the discharge through hole. The lower part of the left side plate of the upper box is formed with a second discharge through hole. A fine filter screen is fixed on the inner side of the left side plate of the upper box corresponding to the second discharge through hole. The fine filter screen covers the second discharge through hole.

[0008] An external connecting end cap is fixed on the outer side wall of the left side plate of the upper box. The external connecting end cap covers the second discharge through hole. A first discharge pipe connector is connected to the middle of the outer end face of the external connecting end cap. A first conveying pump is installed on the top surface of the fixed base plate. The inlet of the first conveying pump is connected to the first discharge pipe connector through a connecting pipe. The outlet of the first conveying pump is connected to the inlet of the ultrafiltration filter installed on the fixed base plate through a connecting pipe. The outlet of the ultrafiltration filter is connected to the inlet of the liquid storage tank installed on the fixed base plate through a connecting pipe. A second conveying pump is fixed on the top surface of the top plate of the liquid storage tank. The inlet of the second conveying pump is connected to the liquid storage tank.

[0009] An alkali-resistant nanofiltration membrane filter is installed in the lower support housing. The outlet of the second delivery pump is connected to the inlet of the alkali-resistant nanofiltration membrane filter through a connecting pipe. The discharge port at the middle filter tube of the alkali-resistant nanofiltration membrane filter is connected to a first drain pipe. The waste liquid outlet of the alkali-resistant nanofiltration membrane filter is connected to the transition storage chamber on the right side of the lower support housing. A recovery drain pipe is connected to the side wall of the transition storage chamber. The inner end of the recovery drain pipe is connected to the transition storage chamber, and the outer end of the recovery drain pipe extends out of the transition storage chamber.

[0010] A rectangular frame-shaped support bar is welded and fixed to the inner side wall of the middle part of the feed box. A rectangular filter cylinder is inserted into the support bar. A radially extending edge is formed on the outer side wall of the top of the rectangular filter cylinder. The radially extending edge presses against the top surface of the support bar. A sealing ring is inserted into the inner side wall of the support bar. The rectangular filter cylinder is inserted into the sealing ring. The inner side wall of the sealing ring presses against the outer side wall of the rectangular filter cylinder. The bottom surface of the bottom plate of the rectangular filter cylinder presses against the top surface of the bottom plate of the feed box. Side discharge holes are formed in the middle of the left and right side plates of the rectangular filter cylinder. Two coarse filter screens are fixed on the inner side walls of the left and right side plates of the rectangular filter cylinder and cover the corresponding side discharge holes. The side discharge holes face the corresponding discharge holes.

[0011] The bottom surface of the radially extending edge is fixed with multiple vertical positioning posts. The vertical positioning posts are inserted into the corresponding vertical positioning through holes formed on the top surface of the support bar. An elastic sealing sleeve is placed on the inner wall of the vertical positioning through hole. The vertical positioning posts are inserted into the elastic sealing sleeve, and their outer walls are pressed against the inner walls of the elastic sealing sleeve.

[0012] A vertical suction pipe is fixed on the top plate of the storage tank. The top of the vertical suction pipe extends out of the top surface of the top plate of the storage tank. The vertical suction pipe is located in the storage tank, and its bottom end is close to the top surface of the bottom plate of the storage tank. The inlet of the second delivery pump is connected to the top of the vertical suction pipe.

[0013] The outstanding effect of this utility model is:

[0014] It can filter wastewater multiple times, and then discharge alkalis such as sodium hydroxide and water through the first drain pipe via the alkali-resistant nanofiltration membrane cartridge, achieving collection and reuse, improving the recovery and utilization of alkali, reducing the use of acid, and achieving good environmental protection results while reducing treatment costs. Attached Figure Description

[0015] Figure 1 This is a partial structural schematic diagram of the present invention;

[0016] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0017] Figure 3 yes Figure 1 A magnified view of another part;

[0018] Figure 4 This is a partial cross-sectional view of an alkali-resistant nanofiltration membrane filter cartridge;

[0019] Figure 5 This is a partial structural diagram of the inner cover panel. Detailed Implementation

[0020] For example, see below. Figures 1 to 5 As shown, a filtration and recovery device for alkaline wastewater includes a fixed base plate 10. A lower support shell 20 is fixed to the middle of the top surface of the fixed base plate 10. An upper mounting groove 21 is formed in the middle of the top surface of the top plate of the lower support shell 20. The lower part of the upper box 30 is inserted into the upper mounting groove 21. The bottom surface of the bottom plate of the upper box 30 presses against the bottom surface of the upper mounting groove 21. The outer side wall of the bottom of the upper box 30 is close to or near the inner side wall of the upper mounting groove 21. The bottom plate of the upper box 30 is fixedly connected to the top plate of the lower support shell 20 by bolts. A placement frame 31 is fixed to the middle of the top surface of the bottom plate of the upper box 30. A rectangular limiting frame is fixed to the edge of the top surface of the top plate of the placement frame 31. The lower part of the feed box 40 is inserted into the rectangular limiting frame, and its bottom surface presses against the top surface of the top plate of the placement frame 31. The feed box 40 is fixed on the placement frame 31.

[0021] A liquid inlet pipe 41 is connected to the upper side plate of the feed box 40. The lower part of the left and right side plates of the feed box 40 is formed with a discharge through hole 42. A coarse filter screen 43 is installed inside the feed box 40. After the wastewater is filtered by the coarse filter screen 43, it flows out from the discharge through hole 42. The lower part of the left side plate of the upper box 30 is formed with a second discharge through hole 32. A fine filter screen 33 is fixed on the inner side of the left side plate of the upper box 30 corresponding to the second discharge through hole 32. The fine filter screen 33 covers the second discharge through hole 32.

[0022] An external connecting end cap 34 is fixed on the outer side wall of the left side plate of the upper box 30. The external connecting end cap 34 covers the second discharge through hole 32. A first discharge pipe connector 341 is connected to the middle of the outer end face of the external connecting end cap 34. The first discharge pipe connector 341 communicates with the second discharge through hole 32. A first conveying pump 50 is installed on the top surface of the fixed base plate 10. The inlet of the first conveying pump 50 is connected to the first discharge pipe connector 341 through a connecting pipe. The outlet of the first conveying pump 50 is connected to the inlet of the ultrafiltration filter 60 installed on the fixed base plate 10 through a connecting pipe. The outlet of the ultrafiltration filter 60 is connected to the inlet of the liquid storage tank 70 installed on the fixed base plate 10 through a connecting pipe. A second conveying pump 71 is fixed on the top surface of the top plate of the liquid storage tank 70. The inlet of the second conveying pump 71 is connected to the liquid storage tank 70.

[0023] An alkali-resistant nanofiltration membrane filter device 80 is installed in the lower support housing 20. The outlet of the second delivery pump 71 is connected to the inlet of the alkali-resistant nanofiltration membrane filter device 80 through a connecting pipe. The discharge port of the middle filter tube of the alkali-resistant nanofiltration membrane filter element 83 of the alkali-resistant nanofiltration membrane filter device 80 (which is a known structure and can be purchased directly from the market, so it will not be described in detail here) is connected to the first drain pipe 81. The waste liquid outlet of the alkali-resistant nanofiltration membrane filter device 80 is connected to the transition storage chamber 22 on the right side of the lower support housing 20 (the waste liquid outlet of the alkali-resistant nanofiltration membrane filter device 80 is located around the discharge port of the middle filter tube, which is a conventional structure, so it will not be described in detail here). A recovery drain pipe 23 is connected to the side wall of the transition storage chamber 22. The inner end of the recovery drain pipe 23 is connected to the transition storage chamber 22, and the outer end of the recovery drain pipe 23 extends out of the transition storage chamber 22.

[0024] Furthermore, a rectangular frame-shaped support bar 44 is welded and fixed to the inner side wall of the middle part of the feed box 40. A rectangular filter cylinder 45 is inserted into the support bar 44. A radially extending edge 451 is formed on the outer side wall of the top of the rectangular filter cylinder 45. The radially extending edge 451 presses against the top surface of the support bar 44. A sealing ring 441 is inserted into the inner side wall of the support bar 44. The rectangular filter cylinder 45 is inserted into the sealing ring 441. The inner side wall of the sealing ring 441 presses against the outer side wall of the rectangular filter cylinder 45. The bottom surface of the bottom plate of the rectangular filter cylinder 45 presses against the top surface of the bottom plate of the feed box 40. Side discharge holes are formed in the middle of the left and right side plates of the rectangular filter cylinder 45. Two coarse filter screens 43 are fixed on the inner side walls of the left and right side plates of the rectangular filter cylinder 45 and cover the corresponding side discharge holes. The side discharge holes face the corresponding discharge holes 42.

[0025] Furthermore, the bottom surface of the radially extending edge 451 is fixed with a plurality of vertical positioning posts 452. The vertical positioning posts 452 are inserted into the corresponding vertical positioning through holes formed on the top surface of the support bar 44. An elastic sealing sleeve is placed on the inner wall of the vertical positioning through hole. The vertical positioning posts 452 are inserted into the elastic sealing sleeve, and their outer walls are pressed against the inner walls of the elastic sealing sleeve.

[0026] Furthermore, gripping parts are fixed on the top surfaces of the radially extending edges 451 on both the left and right sides.

[0027] Furthermore, a vertical suction pipe 72 is fixed on the top plate of the storage tank 70. The top of the vertical suction pipe 72 extends out of the top surface of the top plate of the storage tank 70. The vertical suction pipe 72 is located in the storage tank 70, and its bottom end is close to the top surface of the bottom plate of the storage tank 70. The inlet of the second delivery pump 71 is connected to the top of the vertical suction pipe 72.

[0028] Furthermore, a first support frame is fixed on the top surface of the fixed base plate 10, and the first delivery pump 50 is fixed on the top surface of the top plate of the first support frame.

[0029] Furthermore, the lower support housing 20 includes a top plate, and vertical fixing plates are fixed to the left and right sides of the bottom surface of the top plate, with the bottom surface of the vertical fixing plates fixed to the top surface of the fixed base plate 10.

[0030] The alkali-resistant nanofiltration membrane filtration device 80 includes an outer sleeve 82. The left and right ends of the outer sleeve 82 are welded and fixed to the inner sidewalls of two vertical fixing plates. The left end of the outer sleeve 82 communicates with and corresponds to the first through hole 1 formed in the middle of the left vertical fixing plate, and the right end of the outer sleeve 82 communicates with and corresponds to the second through hole 2 formed in the middle of the right vertical fixing plate. The inner diameter of the first through hole 1 is larger than the inner diameter of the outer sleeve 82, and the inner diameter of the second through hole 2 is smaller than the inner diameter of the outer sleeve 82.

[0031] The alkali-resistant nanofiltration membrane filter element 83 is inserted into the outer sleeve 82. A sealing ring is nested in the annular grooves formed on the outer walls of both ends of the filter element 83. The outer wall of the sealing ring presses against the inner wall of the outer sleeve 82. The right end face of the alkali-resistant nanofiltration membrane filter element 83 presses against the inner wall of the vertical fixing plate on the right side. A second cover plate 84 is fixed on the left side wall of the vertical fixing plate on the left side. An inlet connecting pipe 85 is connected to the second cover plate 84. The second cover plate 84 covers the first through hole 1. The inlet connecting pipe 85 communicates with the first through hole 1. The first through hole 1 communicates with the inlet of the alkali-resistant nanofiltration membrane filter element 83 (the inlet of the alkali-resistant nanofiltration membrane filter element 83 is located around the middle filter tube at the left end of the alkali-resistant nanofiltration membrane filter element 83; this is a conventional structure and will not be described in detail here). The outlet of the second delivery pump 71 is connected to the inlet connecting pipe 85 through a connecting pipe.

[0032] Furthermore, the inner wall of the left end of the outer sleeve 82 is formed with internal threads, and the inner cover plate 86 is screwed onto the inner wall of the left end of the outer sleeve 82. The edge of the inner cover plate 86 is formed with a flow groove, and the right end face of the middle part of the inner cover plate 86 presses against the left end face of the left end plate of the middle filter tube of the alkali-resistant nanofiltration membrane filter element 83 and the left end face of the alkali-resistant nanofiltration membrane filter element 83. The flow groove is connected to the inlet of the alkali-resistant nanofiltration membrane filter element 83.

[0033] Furthermore, a right housing 25 is fixed to the right side wall of the vertical fixing plate on the right side of the lower support housing 20. A transition liquid storage cavity 22 is formed between the right housing 25 and the right vertical fixing plate. The first drain pipe 81 is inserted into the second through hole 2 and the transition liquid storage cavity 22. Its right end extends out of the middle through hole of the right side plate of the transition liquid storage cavity 22. An elastic sealing sleeve is fixed on the inner side wall of the middle through hole. The first drain pipe 81 is in the elastic sealing sleeve, and its outer side wall is pressed against the inner side wall of the elastic sealing sleeve. The outer end of the recovery drain pipe 23 extends out of the right side wall of the right housing 25.

[0034] In this embodiment, wastewater enters the feed box 40 through the inlet pipe 41, is filtered by two coarse filter screens 43, and then flows out through the outlet hole 42 into the upper box 30. Large particles are filtered and placed in the rectangular filter cylinder 45. The rectangular filter cylinder 45 can be periodically pulled out from the support bar 44 for cleaning and to remove filtered impurities. It is easy to disassemble.

[0035] Then, the wastewater is filtered through the fine filter screen 33 and then transported to the ultrafiltration filter 60 (which is a product that can be directly purchased on the market and will not be described in detail here) by the first transfer pump 50. After ultrafiltration, it enters the storage tank 70 for transition, and then enters the alkali-resistant nanofiltration membrane filter element 83 by the second transfer pump 71. The alkaline materials such as sodium hydroxide and water enter the middle filter tube of the alkali-resistant nanofiltration membrane filter element 83, while the remaining substances are outside the middle filter tube, thus achieving separation. The alkaline water is discharged from the first drain pipe 81 for collection and use, while the filtered wastewater enters the transition storage chamber 22 and is discharged through the recovery drain pipe 23 to the subsequent wastewater treatment equipment for further treatment. The liquid discharged from the first drain pipe 81 contains a large amount of alkali, which makes it easy to recycle.

[0036] In this embodiment, the feed box 40, the rectangular filter cylinder 45, and the upper box 30 are detachable, which facilitates cleaning and maintenance.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A filtration and recovery device for alkaline wastewater, comprising a fixed base plate (10), characterized in that: The bottom plate (10) has a lower support shell (20) fixed in the middle of its top surface. The top plate of the lower support shell (20) has an upper box (30) fixed in the top surface. The bottom plate of the upper box (30) has a placement rack (31) fixed in the middle of its top surface. The top plate of the placement rack (31) has a feeding box (40) fixed in the top surface. A liquid inlet pipe (41) is connected to the upper side plate of the feed box (40). The lower part of the left and right side plates of the feed box (40) is formed with a discharge through hole (42). A coarse filter screen (43) is installed inside the feed box (40). After the wastewater is filtered by the coarse filter screen (43), it flows out from the discharge through hole (42). The lower part of the left side plate of the upper box (30) is formed with a second discharge through hole (32). A fine filter screen (33) is fixed on the inner side of the left side plate of the upper box (30) corresponding to the second discharge through hole (32). The fine filter screen (33) covers the second discharge through hole (32). An external connecting end cap (34) is fixed on the outer side wall of the left side plate of the upper box (30). The external connecting end cap (34) covers the second discharge through hole (32). The middle of the outer end face of the external connecting end cap (34) is connected to the first discharge pipe connector (341). A first conveying pump (50) is installed on the top surface of the fixed base plate (10). The inlet of the first conveying pump (50) is connected to the first discharge pipe connector (341) through a connecting pipe. The outlet of the first conveying pump (50) is connected to the inlet of the ultrafiltration filter (60) installed on the fixed base plate (10) through a connecting pipe. The outlet of the ultrafiltration filter (60) is connected to the inlet of the liquid storage tank (70) installed on the fixed base plate (10) through a connecting pipe. A second conveying pump (71) is fixed on the top surface of the top plate of the liquid storage tank (70). The inlet of the second conveying pump (71) is connected to the liquid storage tank (70). An alkali-resistant nanofiltration membrane filter (80) is installed in the lower support housing (20). The outlet of the second delivery pump (71) is connected to the inlet of the alkali-resistant nanofiltration membrane filter (80) through a connecting pipe. The discharge port at the middle filter tube of the alkali-resistant nanofiltration membrane filter (80) is connected to the first drain pipe (81). The waste liquid outlet of the alkali-resistant nanofiltration membrane filter (80) is connected to the transition storage chamber (22) on the right side of the lower support housing (20). A recovery drain pipe (23) is connected to the side wall of the transition storage chamber (22). The inner end of the recovery drain pipe (23) is connected to the transition storage chamber (22), and the outer end of the recovery drain pipe (23) extends out of the transition storage chamber (22).

2. The filtration and recovery device for alkaline wastewater according to claim 1, characterized in that: A rectangular frame-shaped support strip (44) is welded and fixed to the inner wall of the middle part of the feed box (40). A rectangular filter cylinder (45) is inserted into the support strip (44). A radially extending edge (451) is formed on the outer top wall of the rectangular filter cylinder (45). The radially extending edge (451) presses against the top surface of the support strip (44). A sealing ring (441) is fitted on the inner wall of the support strip (44). The rectangular filter cylinder (45) is inserted into the sealing ring (441). The inner wall of the sealing ring (441) presses against the outer wall of the rectangular filter cylinder (45), the bottom surface of the bottom plate of the rectangular filter cylinder (45) presses against the top surface of the bottom plate of the feed box (40), the middle of the left and right plates of the rectangular filter cylinder (45) is formed with side discharge holes, the two coarse filter screens (43) are fixed on the inner walls of the left and right plates of the rectangular filter cylinder (45) and cover the corresponding side discharge holes, the side discharge holes face the corresponding discharge holes (42).

3. The filtration and recovery device for alkaline wastewater according to claim 2, characterized in that: The bottom surface of the radial extension edge (451) is fixed with a plurality of vertical positioning posts (452). The vertical positioning posts (452) are inserted into the corresponding vertical positioning through holes formed on the top surface of the support bar (44). An elastic sealing sleeve is placed on the inner side wall of the vertical positioning through hole. The vertical positioning post (452) is inserted into the elastic sealing sleeve, and its outer side wall is pressed against the inner side wall of the elastic sealing sleeve.

4. The filtration and recovery device for alkaline wastewater according to claim 2, characterized in that: A gripping part is fixed on the top surface of the radially extending edge (451) on both the left and right sides.

5. The filtration and recovery device for alkaline wastewater according to claim 1, characterized in that: A vertical suction pipe (72) is fixed on the top plate of the storage tank (70). The top of the vertical suction pipe (72) extends out of the top surface of the top plate of the storage tank (70). The vertical suction pipe (72) is located in the storage tank (70), and its bottom end is close to the top surface of the bottom plate of the storage tank (70). The inlet of the second delivery pump (71) is connected to the top of the vertical suction pipe (72).

6. The filtration and recovery device for alkaline wastewater according to claim 1, characterized in that: A first support frame is fixed on the top surface of the fixed base plate (10), and a first delivery pump (50) is fixed on the top surface of the top plate of the first support frame.

7. The filtration and recovery device for alkaline wastewater according to claim 1, characterized in that: The lower support shell (20) includes a top plate, and vertical fixing plates are fixed on the left and right sides of the bottom surface of the top plate. The bottom surface of the vertical fixing plates is fixed on the top surface of the fixed base plate (10). The alkali-resistant nanofiltration membrane filter device (80) includes an outer sleeve (82). The left and right ends of the outer sleeve (82) are welded and fixed to the inner walls of two vertical fixing plates. The left end of the outer sleeve (82) is connected to and corresponds to the first through hole (1) formed in the middle of the left vertical fixing plate. The right end of the outer sleeve (82) is connected to and corresponds to the second through hole (2) formed in the middle of the right vertical fixing plate. The inner diameter of the first through hole (1) is larger than the inner diameter of the outer sleeve (82), and the inner diameter of the second through hole (2) is smaller than the inner diameter of the outer sleeve (82). The alkali-resistant nanofiltration membrane filter element (83) is inserted into the outer sleeve (82). A sealing ring is nested in the annular groove formed on the outer side wall of the left and right ends. The outer side wall of the sealing ring is pressed against the inner side wall of the outer sleeve (82). The right end face of the alkali-resistant nanofiltration membrane filter element (83) is pressed against the inner side wall of the vertical fixing plate on the right side. A second cover plate (84) is fixed on the left side wall of the vertical fixing plate on the left side. An inlet connecting pipe (85) is connected to the second cover plate (84). The second cover plate (84) covers the first through hole (1). The inlet connecting pipe (85) is connected to the first through hole (1). The first through hole (1) is connected to the inlet of the alkali-resistant nanofiltration membrane filter element (83). The outlet of the second delivery pump (71) is connected to the inlet connecting pipe (85) through the connecting pipe.

8. The filtration and recovery device for alkaline wastewater according to claim 7, characterized in that: The inner wall of the left end of the outer sleeve (82) is formed with internal threads. The inner cover plate (86) is screwed onto the inner wall of the left end of the outer sleeve (82). The edge of the inner cover plate (86) is formed with a flow groove. The right end face of the middle part of the inner cover plate (86) presses against the left end face of the left end plate of the middle filter tube of the alkali-resistant nanofiltration membrane filter element (83) and the left end face of the alkali-resistant nanofiltration membrane filter element (83). The flow groove is connected to the inlet of the alkali-resistant nanofiltration membrane filter element (83).

9. The filtration and recovery device for alkaline wastewater according to claim 7, characterized in that: A right housing (25) is fixed on the right side wall of the vertical fixing plate on the right side of the lower support housing (20). A transition liquid storage cavity (22) is formed between the right housing (25) and the right vertical fixing plate. The first drain pipe (81) is inserted into the second through hole (2) and the transition liquid storage cavity (22). Its right end extends out of the middle through hole of the right side plate of the transition liquid storage cavity (22). An elastic sealing sleeve is fixed on the inner side wall of the middle through hole. The first drain pipe (81) is in the elastic sealing sleeve. Its outer side wall is pressed against the inner side wall of the elastic sealing sleeve. The outer end of the recovery drain pipe (23) extends out of the right side wall of the right housing (25).

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