A high-efficiency membrane separation device and method for waste liquid from copper citrate production

Abstract

The present invention relates to the technical field of wastewater treatment, and discloses a high-efficiency membrane separation device and method for wastewater from copper citrate production, comprising a filter membrane cartridge and a filter cartridge detachably connected to the filter membrane cartridge, a slidable ultrafiltration membrane being provided inside the filter membrane cartridge, a driving structure for driving the ultrafiltration membrane to slide back and forth being provided inside the filter cartridge, an injection pipe for introducing wastewater being installed on the filter cartridge, and the wastewater ejected from the injection pipe drives the driving structure to operate. The invention increases the contact area and contact opportunity with the wastewater through the reciprocatingly sliding ultrafiltration membrane, thereby improving the separation efficiency. In addition, the ultrafiltration membrane in motion generates disturbances, reduces the accumulation of impurities on the membrane surface, keeps the membrane pores unobstructed, and also has a certain flushing effect, which helps to remove pollutants on the membrane surface.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a high-efficiency membrane separation device and method for waste liquid produced by copper citrate. Background Art

[0002] As the scale of copper citrate production continues to expand, the problem of waste liquid treatment in its production process has become increasingly prominent. Copper citrate production waste liquid usually contains a variety of harmful substances and valuable components. If it is not effectively treated, it will not only cause serious pollution to the environment, but also waste resources.

[0003] During the treatment of copper citrate waste liquid, the copper ions and water in the copper citrate production waste liquid are first effectively separated through a membrane process to obtain high-purity copper ions and purified water; then the multi-effect evaporation technology is used to evaporate and concentrate the wastewater to further enrich the copper ions and form solids or concentrated liquids for further utilization; the comprehensive use of membrane separation and multi-effect evaporation coupling technology maximizes the recycling of water resources, the efficient recovery of residual copper ions in the copper citrate production waste liquid, and zero wastewater discharge.

[0004] In the membrane separation process of copper citrate waste liquid, water in the wastewater is separated and the wastewater is concentrated. At present, wastewater is generally treated by ultrafiltration membrane. However, impurities are easily attached to the ultrafiltration membrane during the membrane separation process, resulting in a decrease in the filtration effect of the ultrafiltration membrane. For this reason, we propose a high-efficiency membrane separation equipment and method for copper citrate production waste liquid. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a high-efficiency membrane separation device and method for wastewater from copper citrate production, which enables the ultrafiltration membrane to treat the wastewater in an active state, making it difficult for impurities to adhere thereto, and reversely flushes multiple areas of the ultrafiltration membrane to clean up the attached impurities.

[0006] The present invention provides the following technical solution: a high-efficiency membrane separation device for waste liquid produced by copper citrate, comprising a filter membrane cartridge and a filter cartridge detachably connected to the filter membrane cartridge, a slidable ultrafiltration membrane is arranged inside the filter membrane cartridge, a driving structure for driving the ultrafiltration membrane to slide back and forth is arranged inside the filter cartridge, an injection pipe for introducing waste liquid is installed on the filter cartridge, and the waste water injected by the injection pipe drives the driving structure to operate;

[0007] The ultrafiltration membrane comprises a membrane cylinder and pistons installed at both ends of the membrane cylinder, and a plurality of groups of conducting filter membrane tubes are arranged between the two pistons. Three equally spaced baffles are arranged inside the membrane cylinder, and holes for the filter membrane tubes to pass through are arranged on the baffles. The three baffles divide the inside of the membrane cylinder into four filtration spaces.

[0008] The driving structure is connected to the front piston, driving the ultrafiltration membrane to slide back and forth, so that the wastewater passes through the front piston and is introduced into the filter membrane tube for membrane separation. The wastewater is discharged from the piston at the end through the filter membrane tube, and the water after membrane separation remains in the membrane cylinder, so that the wastewater is membrane separated in the reciprocating ultrafiltration membrane;

[0009] The membrane cylinder is provided with a material pipe for leading out the water after membrane separation, and the material pipe is inserted from the center of the piston at the end and passes through three baffles and abuts against the piston at the front end, and the water after membrane separation in the membrane cylinder is discharged through the material pipe;

[0010] The end of the material pipe is equipped with an adjustment joint, and the port on the side of the adjustment joint is connected to the interface on the filter membrane cartridge through a hose, and the inside of the ultrafiltration membrane can be backwashed through the material pipe;

[0011] The end surface of the filter cartridge is provided with a drain port for flushing, and the end of the filter membrane cartridge is provided with a water outlet, and both the drain port and the water outlet are provided with valves;

[0012] An end plate is detachably mounted at the end of the filter membrane cartridge, and an adjusting device for adjusting the material pipe mode is disposed on the end plate. The material pipe is adjusted by the adjusting device so that the material pipe cleans the four filter spaces one by one during the backwashing process.

[0013] Preferably, the driving structure includes a rotatable water wheel blade arranged inside the filter cartridge, the connecting shaft of the water wheel blade is connected to the movable column, and the surface of the movable column is provided with a circumferentially distributed slide groove, the movable column is provided with a slidable sleeve, and the sleeve is installed with a ball for rolling in the slide groove, when the movable column rotates, the ball on the sleeve is driven to roll along the slide groove on the surface of the movable column, so that the sleeve reciprocates, and a positioning shaft is installed at the other end of the sleeve, the positioning shaft is detachably connected to the piston at the front end, and the wastewater ejected from the injection pipe drives the water wheel blade to rotate and drives the movable column to rotate, thereby driving the ultrafiltration membrane to reciprocate.

[0014] Preferably, the sleeve is an external gear cylinder, and a slidable internal gear ring is provided on the outer side of the sleeve, and the internal gear ring is connected to the filter cylinder through a bracket.

[0015] Preferably, the piston at the front end is connected to the positioning shaft via a latch.

[0016] Preferably, the material pipe includes an outer tube in contact with the piston and the baffle and a rotatable inner tube arranged inside the outer tube, the outer tube is divided into four branches according to the positions of the four filtration spaces, and the four branches of the outer tube are provided with material ports, and the four material ports are distributed in a straight line, the inner tube is also provided with four branches, and the four branches of the inner tube are provided with pipe ports distributed in a straight line, when the pipe port on the inner tube is aligned with the material port on the outer tube and connected, the water after membrane separation is discharged from the inner tube.

[0017] Preferably, the four branches of the inner tube are all provided with flushing ports for backwashing, the flushing ports and pipe openings on the four branches are arranged in five directions of a circular array distribution of the cross section of the inner tube, and the four flushing ports are distributed in a spiral shape.

[0018] Preferably, during the backwashing process, the inner tube rotates 72 degrees, the flushing port on the first branch of the inner tube is aligned with the feed port, and the other three flushing ports are staggered with the feed port;

[0019] The inner tube is rotated 72 degrees again, the flushing port on the second branch of the inner tube is aligned with the material port, and the other three flushing ports are staggered with the material port;

[0020] The inner tube is rotated 72 degrees again, the flushing port on the third branch of the inner tube is aligned with the material port, and the other three flushing ports are staggered with the material port;

[0021] The inner tube is rotated 72 degrees again, the flushing port on the fourth branch of the inner tube is aligned with the material port, and the other three flushing ports are staggered with the material port;

[0022] Each rotation of the inner tube adjusts the position of the flushing port, so that water is introduced into the four filter spaces in sequence, and the four filter spaces are cleaned separately;

[0023] When the inner tube rotates 72 degrees again, the inner tube returns to its original position.

[0024] Preferably, the adjustment joint includes a rotor and a shell rotating on the rotor, and the rotor is led out from the shell, both ends of the rotor contact the shell through a rotating seal, and one end of the rotor is provided with a channel connected to the material pipe, the interior of the shell is provided with a cavity connected to the port on the shell, and the rotor is provided with a through opening located at the connecting cavity, and the adjusting device is connected to the other end of the rotor to drive the material pipe for adjustment.

[0025] Preferably, the adjustment device includes a rotatable turntable arranged on the inner side of the end plate, a spline sleeve is installed on the turntable, a slidable spline shaft is provided inside the spline sleeve, and the spline shaft is connected to the adjustment joint, and a motor for driving the turntable to rotate is installed on the outer side of the end plate.

[0026] A high-efficiency membrane separation method for waste liquid from copper citrate production, the specific operation is as follows:

[0027] S1. The copper citrate waste liquid is introduced into the filter cartridge through the injection pipe. The water flow drives the driving structure to operate, so that the driving structure drives the ultrafiltration membrane to reciprocate in the filter cartridge. The copper citrate waste liquid flows from the filter cartridge into the filter cartridge and passes through the ultrafiltration membrane.

[0028] S2, the copper citrate waste liquid passes through several groups of filter membrane tubes on the piston. When the copper citrate waste liquid passes through the filter membrane tubes, part of the water is separated by the filter membrane tubes and enters the membrane cylinder, while the remaining copper citrate waste liquid is led out from another piston through the filter membrane tube, enters the end of the filter membrane cylinder, and is discharged from the water outlet;

[0029] S3. The water in the membrane cylinder is sucked out through the material pipe, so that the water is discharged from the hose through the adjustment joint and discharged through the interface;

[0030] S4. During backwashing, water is introduced from the interface and into the adjustment joint through a hose, and then introduced into the interior of the ultrafiltration membrane through a material pipe. The material pipe is adjusted through an adjusting device to allow water to be introduced into the four filter spaces of the ultrafiltration membrane one by one. The water reversely permeates in the four filter spaces to wash away the stains inside the filter membrane tube.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The reciprocating sliding of the ultrafiltration membrane increases the contact area and contact opportunity with the waste liquid, thereby improving the separation efficiency. In addition, the ultrafiltration membrane in motion produces disturbances, which reduces the accumulation of impurities on the membrane surface, keeps the membrane pores unobstructed, and also has a certain flushing effect, which helps to remove pollutants on the membrane surface;

[0033] (2) The wastewater injected from the injection pipe directly drives the water wheel blades to rotate, thereby driving the ultrafiltration membrane to slide back and forth. This self-driving design not only saves additional power sources, but also improves energy utilization and reduces operating costs;

[0034] (3) By backwashing, one filter space is cleaned at a time, which can more effectively remove the stains in the filter membrane tube, make the cleaning cleaner, and extend the service life of the ultrafiltration membrane. Water is introduced into the four filter spaces in turn to concentrate the water flow, which increases the contact area between each filter membrane tube and water and improves the efficiency of backwashing.

[0035] (4) The membrane cartridge and filter cartridge are detachably connected, which is convenient for equipment maintenance and component replacement, and convenient for replacing the ultrafiltration membrane. The components connected to the ultrafiltration membrane are connected in a modular manner, which is easy to install, maintain and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 For the present invention Figure 1 Schematic diagram of the split structure;

[0038] Figure 3 This is a schematic diagram of the internal structure of the filter cartridge of the present invention;

[0039] Figure 4 For the present invention Figure 3 Schematic diagram of the split structure;

[0040] Figure 5 For the present invention Figure 4 Schematic diagram of the local structure;

[0041] Figure 6 It is a schematic diagram of the structure of the ultrafiltration membrane of the present invention;

[0042] Figure 7 For the present invention Figure 6 Schematic diagram of the local structure;

[0043] Figure 8 This is a schematic diagram of the material pipe structure of the present invention;

[0044] Fig. 9 This is a schematic diagram of the conductive structure of the first branch of the inner tube of the present invention;

[0045] Fig.10 This is a schematic diagram of the conductive structure of the second branch of the inner tube of the present invention;

[0046] Fig.11 This is a schematic diagram of the conductive structure of the third branch of the inner tube of the present invention;

[0047] Fig.12 This is a schematic diagram of the conductive structure of the fourth branch of the inner tube of the present invention;

[0048] Fig.13 This is a schematic diagram of the conduction structure of the inner tube and the outer tube rotating and switching according to the present invention;

[0049] Fig.14 This is a schematic diagram of adjusting the joint structure of the present invention.

[0050] In the figure: 1. filter membrane cartridge; 2. filter cartridge; 3. ultrafiltration membrane; 4. drive structure; 5. injection pipe; 6. adjustment joint; 7. hose; 8. interface; 9. regulating device; 10. end plate; 11. drain port; 12. water outlet; 31. membrane cartridge; 32. piston; 33. filter membrane tube; 34. baffle; 35. material tube; 41. water wheel blade; 42. movable column; 43. slide groove; 44. sleeve; 45. ball; 46. inner gear ring; 47. bracket; 48. positioning shaft; 351. outer tube; 352. inner tube; 353. branch; 354. material port; 355. pipe port; 356. flushing port; 61. rotor; 62. shell; 63. channel; 64. port; 65. connecting cavity; 91. turntable; 92. spline sleeve; 93. spline shaft; 94. motor. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of known functions and known components to avoid unnecessary confusion of the concepts of the present invention.

[0052] See also Figure 1 and Figure 2 , a high-efficiency membrane separation device for waste liquid from copper citrate production, mainly composed of a filter membrane cartridge 1, a filter cartridge 2, an ultrafiltration membrane 3, a driving structure 4, an injection pipe 5 and other components. The filter membrane cartridge 1 and the filter cartridge 2 are detachably connected, a slidable ultrafiltration membrane 3 is provided inside the filter membrane cartridge 1, a driving structure 4 for driving the ultrafiltration membrane 3 to slide back and forth is provided inside the filter cartridge 2, and an injection pipe 5 for introducing waste liquid is installed on the filter cartridge 2.

[0053] See also Figure 3 , Figure 4 and Figure 5 The driving structure 4 includes a rotatable water wheel blade 41 disposed inside the filter cartridge 2. The connecting shaft of the water wheel blade 41 is connected to a movable column 42. A surrounding O-shaped slide groove 43 is disposed on the surface of the movable column 42. A slidable sleeve 44 is disposed on the movable column 42. A ball 45 rolling in the slide groove 43 is installed in the sleeve 44. When the movable column 42 rotates, the ball 45 is driven to roll along the slide groove 43, so that the sleeve 44 reciprocates. A positioning shaft 48 is installed at the other end of the sleeve 44. The positioning shaft 48 is detachably connected to the front piston 32 through a latch.

[0054] The wastewater ejected from the injection pipe 5 is sprayed under the blades of the water wheel blades 41. The water wheel blades 41 rotate under the drive of the water flow and drive the movable column 42 to rotate, driving the ball 45 on the sleeve 44 to roll along the slide groove 43 on the surface of the movable column 42, so that the sleeve 44 reciprocates and drives the ultrafiltration membrane 3 to reciprocate. When the wastewater is in the ultrafiltration membrane 3, the reciprocating ultrafiltration membrane 3 will increase the contact area and contact opportunity with the wastewater, and the ultrafiltration membrane 3 in motion can produce a certain disturbance, so that impurities are not easy to accumulate in a fixed position, and it has a certain flushing effect, thereby keeping the pores of the ultrafiltration membrane 3 unobstructed, which is conducive to the continuous membrane separation.

[0055] The sleeve 44 is an external gear cylinder with a slidable internal gear ring 46 on the outside. The internal gear ring 46 is connected to the filter cylinder 2 through a bracket 47, so that the sleeve 44 will not rotate during the reciprocating motion, so that the ultrafiltration membrane 3 can only slide back and forth in the filter membrane cylinder 1, avoiding the ultrafiltration membrane 3 from rotating and reciprocating, resulting in sealing problems.

[0056] See also Figure 6 and Figure 7The ultrafiltration membrane 3 includes a membrane cylinder 31, pistons 32 installed at both ends of the membrane cylinder 31, and a plurality of conductive membrane tubes 33 arranged between the two pistons 32. Three equally spaced baffles 34 are arranged inside the membrane cylinder 31, and holes are arranged on the baffles 34 for the membrane tubes 33 to pass through, dividing the inside of the membrane cylinder 31 into four filtration spaces. The driving structure 4 is connected to the front piston 32, driving the ultrafiltration membrane 3 to slide back and forth, so that the wastewater passes through the front piston 32 and is introduced into the membrane tube 33 for membrane separation. The wastewater is discharged from the end piston 32 through the membrane tube 33, and the water after membrane separation remains in the membrane cylinder 31.

[0057] A material pipe 35 for exporting water after membrane separation is provided in the membrane cartridge 31. The material pipe 35 is inserted from the center of the end piston 32 and passes through three baffles 34 to abut against the front piston 32. The water after membrane separation in the membrane cartridge 31 is discharged through the material pipe 35. An adjustment joint 6 is installed at the end of the material pipe 35. The port on the side of the adjustment joint 6 is connected to the interface 8 on the filter membrane cartridge 1 through a hose 7, so that the inside of the ultrafiltration membrane 3 can be backwashed. A drain port 11 for flushing is provided on the end face of the filter cartridge 2, and a water outlet 12 is provided at the end of the filter membrane cartridge 1. Both the drain port 11 and the water outlet 12 are provided with valves. An end plate 10 is detachably installed at the end of the filter membrane cartridge 1, and an adjustment device 9 for adjusting the mode of the material pipe 35 is provided on the end plate 10.

[0058] During the membrane separation process of wastewater, the wastewater is introduced from the injection pipe 5 and discharged from the water outlet 12, and the separated water is pumped out through the material pipe 35. During the backwashing process, the material pipe 35 is adjusted by the regulating device 9 so that the material pipe 35 can introduce cleaning water to the four filter spaces in the ultrafiltration membrane 3 one by one. Each time the cleaning is performed, only one filter space is cleaned, reducing the cleaning space. In this way, the four filter spaces can be cleaned with better effect.

[0059] See also Figure 8 The material pipe 35 includes an outer pipe 351 in contact with the piston 32 and the baffle 34 and an inner pipe 352 rotatably arranged inside the outer pipe 351. The outer pipe 351 is divided into four branches 353 according to the positions of the four filtration spaces. The four branches 353 of the outer pipe 351 are each provided with a material port 354, and the four material ports 354 are distributed in a straight line. The inner pipe 352 is also provided with four branches 353, and the four branches 353 of the inner pipe 352 are each provided with a pipe port 355 distributed in a straight line. When the pipe port 355 on the inner pipe 352 is aligned with the material port 354 on the outer pipe 351, the water after membrane separation is discharged from the inner pipe 352. The four branches 353 of the inner pipe 352 are each provided with a flushing port 356 for backwashing. The flushing ports 356 and the pipe ports 355 on the four branches 353 are arranged in five directions of a circular array distribution in the cross section of the inner pipe 352, such as Fig.13 , and the four flushing ports 356 are distributed in a spiral shape.

[0060] During the separation process of the ultrafiltration membrane 3, the four material ports 354 on the outer tube 351 are aligned and connected with the four pipe ports 355 on the inner tube 352, so that water enters the inner tube 352 and is extracted. Due to the four filtration spaces in the ultrafiltration membrane 3, the separated water in the four filtration spaces needs to be extracted.

[0061] See also Fig. 9 During the backwashing process, the inner tube 352 rotates 72 degrees, the flushing port 356 on the first branch 353 of the inner tube 352 is aligned with the feed port 354, and the other three flushing ports 356 are staggered with the feed port 354. When flushing in this way, water is introduced from the interface 8 and introduced into the adjustment joint 6 through the hose 7, and then introduced into the ultrafiltration membrane 3 through the inner tube 352. At this time, the flushing port 356 on the first branch 353 of the outer tube 351 and the inner tube 352 is connected with the feed port 354, and water enters the first filtration space of the ultrafiltration membrane 3, and reverse osmosis is used to flush the filtration space.

[0062] See also Fig.10 , the inner tube 352 rotates 72 degrees again, the flushing port 356 on the second branch 353 of the inner tube 352 is aligned with the feed port 354, and the other three flushing ports 356 are staggered with the feed port 354, so that the flushing ports 356 on the first branch 353 of the outer tube 351 and the inner tube 352 are closed to the feed port 354, while the flushing port 356 on the second branch 353 is connected to the feed port 354, and water is introduced into the second filtration space of the ultrafiltration membrane 3, and the filtration space is flushed by reverse osmosis.

[0063] See also Fig.11 , the inner tube 352 rotates 72 degrees again, the flushing port 356 on the third branch 353 of the inner tube 352 is aligned with the feed port 354, and the other three flushing ports 356 are staggered with the feed port 354; in this way, the flushing ports 356 and the feed port 354 on the first and second branches 353 of the outer tube 351 and the inner tube 352 are closed, while the flushing port 356 on the third branch 353 is connected with the feed port 354, and water is introduced into the third filtration space of the ultrafiltration membrane 3, and the filtration space is flushed by reverse osmosis.

[0064] See also Fig.12 , the inner tube 352 rotates 72 degrees again, the flushing port 356 on the fourth branch 353 of the inner tube 352 is aligned with the feed port 354, and the other three flushing ports 356 are staggered with the feed port 354; in this way, the flushing ports 356 and the feed port 354 on the first and second sections and the third branch 353 of the outer tube 351 and the inner tube 352 are closed, while the flushing port 356 on the fourth branch 353 is connected with the feed port 354, and water is introduced into the fourth filter space of the ultrafiltration membrane 3, and the filter space is flushed by reverse osmosis.

[0065] Each time the inner tube 352 rotates, it adjusts the position of the flushing port 356, so that water is introduced into the four filter spaces in turn, and the four filter spaces are cleaned separately. Each time a filter space is reversely flushed, the water can be concentrated more effectively, and the contact area between each filter membrane tube 33 in the filter space and the water is increased, the efficiency of reverse flushing is enhanced, and the inside of the filter membrane tube 33 is cleaned more thoroughly. Finally, the inner tube 352 rotates 72 degrees again, and the inner tube 352 returns to its original position, so that the inner tube 352 can concentrate on reverse flushing the four filter spaces.

[0066] See also Fig.14 The adjusting joint 6 includes a rotor 61 and a shell 62 rotating on the rotor 61. The rotor 61 is led out from the shell 62. Both ends of the rotor 61 contact the shell 62 through a rotary seal. One end of the rotor 61 is provided with a channel 63 communicating with the material pipe 35. The interior of the shell 62 is provided with a cavity 65 communicating with the port 64 on the shell 62. The rotor 61 is provided with a through opening located at the communicating cavity 65. The adjusting device 9 is connected to the other end of the rotor 61 to drive the material pipe 35 to adjust, and the inner tube 352 is threadedly connected to the port of the channel 63 of the rotor 61 for easy disassembly, and the other end of the rotor 61 is connected to the adjusting device 9. In this way, the adjusting device 9 drives the inner tube 352 to rotate through the rotor 61, and the shell 62 rotates on the rotor 61 without changing its position, so as to avoid the entanglement of the hose 7 and affect the rotation of the adjusting joint 6. The adjusting joint 6 can perform water pumping and backwashing operations under the rotation of the adjusting device 9.

[0067] The adjusting device 9 includes a rotatable turntable 91 arranged on the inner side of the end plate 10, a spline sleeve 92 is installed on the turntable 91, a slidable spline shaft 93 is arranged inside the spline sleeve 92, the spline shaft 93 is connected to the adjustment joint 6, and a motor 94 for driving the turntable 91 to rotate is installed on the outer side of the end plate 10. Since the adjustment of the material pipe 35 requires the rotation of the inner tube 352, but the material pipe 35 moves back and forth with the ultrafiltration membrane 3, it is necessary to cooperate with the spline shaft 93 and the spline sleeve 92, so that the motor 94 drives the spline shaft 93 and the spline sleeve 92 to rotate 72 degrees each time, and the rotor 61 drives the inner tube 352 to rotate 72 degrees, so that one adjustment is completed, and the material pipe 35 is adjusted by rotating 72 degrees each time.

[0068] A high-efficiency membrane separation method for waste liquid from copper citrate production, the specific operation is as follows:

[0069] S1, copper citrate waste liquid is introduced into the filter cartridge 2 through the injection pipe 5, the water flow drives the driving structure 4 to operate, so that the driving structure 4 drives the ultrafiltration membrane 3 to reciprocate in the filter membrane cartridge 1, and the copper citrate waste liquid flows from the filter cartridge 2 into the filter membrane cartridge 1 and passes through the ultrafiltration membrane 3;

[0070] S2, the copper citrate waste liquid passes through a plurality of groups of filter membrane tubes 33 on the piston 32. When the copper citrate waste liquid passes through the filter membrane tubes 33, a portion of the water therein is separated through the filter membrane tubes 33 and enters the membrane cylinder 31, while the remaining copper citrate waste liquid is led out from another piston 32 through the filter membrane tubes 33, enters the end of the filter membrane cylinder 1, and is discharged from the water outlet 12;

[0071] S3, the water in the membrane cylinder 31 is sucked out through the material pipe 35, so that the water is discharged from the hose 7 through the adjustment joint 6 and discharged through the interface 8;

[0072] S4. During backwashing, water is introduced from the interface 8 and into the adjustment joint 6 through the hose 7, and then introduced into the interior of the ultrafiltration membrane 3 through the material pipe 35. The material pipe 35 is adjusted by the regulating device 9 to allow water to be introduced into the four filter spaces of the ultrafiltration membrane 3 one by one. The water reversely permeates in the four filter spaces to wash the stains inside the filter membrane tube 33.

[0073] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A high-efficiency membrane separation device for wastewater from copper citrate production, characterized in that: The invention comprises a filter membrane cartridge (1) and a filter cartridge (2) detachably connected to the filter membrane cartridge (1), wherein a slidable ultrafiltration membrane (3) is provided inside the filter membrane cartridge (1), and a driving structure (4) for driving the ultrafiltration membrane (3) to slide back and forth is provided inside the filter cartridge (2), and an injection pipe (5) for introducing waste liquid is installed on the filter cartridge (2), and the waste water injected by the injection pipe (5) drives the driving structure (4) to operate; The ultrafiltration membrane (3) comprises a membrane cylinder (31) and pistons (32) mounted at both ends of the membrane cylinder (31), and a plurality of groups of conducting filter membrane tubes (33) are arranged between the two pistons (32). Three baffles (34) are arranged at equal intervals inside the membrane cylinder (31), and holes are arranged on the baffles (34) for the filter membrane tubes (33) to pass through. The three baffles (34) divide the interior of the membrane cylinder (31) into four filtering spaces. The driving structure (4) is connected to the front piston (32) to drive the ultrafiltration membrane (3) to slide back and forth, so that the wastewater passes through the front piston (32) and is introduced into the filter membrane tube (33) for membrane separation. The wastewater is discharged from the rear piston (32) through the filter membrane tube (33), while the water after membrane separation remains in the membrane cylinder (31), so that the wastewater is membrane separated in the reciprocating ultrafiltration membrane (3); The membrane cylinder (31) is provided with a material pipe (35) for discharging water after membrane separation, and the material pipe (35) is inserted from the center of the piston (32) at the end and passes through three baffles (34) and abuts against the piston (32) at the front end. The water after membrane separation in the membrane cylinder (31) is discharged through the material pipe (35); The end of the material pipe (35) is provided with an adjustment joint (6), and a port on the side of the adjustment joint (6) is connected to an interface (8) on the filter membrane cartridge (1) via a hose (7), so that the interior of the ultrafiltration membrane (3) can be backwashed via the material pipe (35); The end surface of the filter cartridge (2) is provided with a drain port (11) for flushing, and the end of the filter membrane cartridge (1) is provided with a water outlet (12), and both the drain port (11) and the water outlet (12) are provided with valves; An end plate (10) is detachably mounted on the end of the filter membrane cartridge (1), and an adjusting device (9) for adjusting the mode of the material pipe (35) is provided on the end plate (10). The material pipe (35) is adjusted by the adjusting device (9) so that the material pipe (35) cleans the four filter spaces one by one during the backwashing process; The driving structure (4) comprises a rotatable water wheel blade (41) arranged inside the filter cartridge (2); the connecting shaft of the water wheel blade (41) is connected to the movable column (42); and the surface of the movable column (42) is provided with a surrounding O-shaped slide groove (43); the movable column (42) is provided with a slidable sleeve (44); and the sleeve (44) is provided with a ball (45) for rolling in the slide groove (43); when the movable column (42) rotates, the ball (45) on the sleeve (44) is driven to roll along the slide groove (43) on the surface of the movable column (42), so that the sleeve (44) reciprocates; a positioning shaft (48) is installed at the other end of the sleeve (44); the positioning shaft (48) is detachably connected to the piston (32) at the front end; and the wastewater ejected from the ejection pipe (5) drives the water wheel blade (41) to rotate and drives the movable column (42) to rotate, thereby driving the ultrafiltration membrane (3) to reciprocate; The adjusting device (9) comprises a rotatable turntable (91) arranged on the inner side of the end plate (10), a spline sleeve (92) being mounted on the turntable (91), a slidable spline shaft (93) being arranged inside the spline sleeve (92), and the spline shaft (93) being connected to the adjusting joint (6), and a motor (94) for driving the turntable (91) to rotate being mounted on the outer side of the end plate (10); The material pipe (35) comprises an outer pipe (351) in contact with the piston (32) and the baffle (34), and a rotatable inner pipe (352) arranged inside the outer pipe (351); the outer pipe (351) is divided into four branches (353) according to the positions of the four filtration spaces, and the four branches (353) of the outer pipe (351) are each provided with a material port (354), and the four material ports (354) are distributed in a straight line; the inner pipe (352) is also provided with four branches (353), and the four branches (353) of the inner pipe (352) are each provided with a pipe port (355) distributed in a straight line; when the pipe port (355) on the inner pipe (352) is aligned with the material port (354) on the outer pipe (351), the water after membrane separation is discharged from the inner pipe (352); The four branches (353) of the inner tube (352) are each provided with a flushing port (356) for backwashing; the flushing ports (356) and the pipe ports (355) on the four branches (353) are arranged in five directions of a circular array distribution of the cross section of the inner tube (352); and the four flushing ports (356) are distributed in a spiral shape.

2. The high-efficiency membrane separation equipment for wastewater from copper citrate production according to claim 1, characterized in that: The sleeve (44) is an external gear cylinder, and a slidable internal gear ring (46) is provided on the outer side of the sleeve (44), and the internal gear ring (46) is connected to the filter cylinder (2) via a bracket (47).

3. The high-efficiency membrane separation equipment for wastewater from copper citrate production according to claim 1, characterized in that: The front end of the piston (32) and the positioning shaft (48) are connected via a latch.

4. The high-efficiency membrane separation equipment for wastewater from copper citrate production according to claim 1, characterized in that: During the backwashing process, the inner tube (352) rotates 72 degrees, the flushing port (356) on the first branch (353) of the inner tube (352) is aligned with the material port (354), and the other three flushing ports (356) are staggered with the material port (354); The inner tube (352) is rotated again by 72 degrees, and the flushing port (356) on the second branch (353) of the inner tube (352) is aligned with the material port (354), and the other three flushing ports (356) are staggered with the material port (354); The inner tube (352) is rotated again by 72 degrees, and the flushing port (356) on the third branch (353) of the inner tube (352) is aligned with the material port (354), and the other three flushing ports (356) are staggered with the material port (354); The inner tube (352) is rotated again by 72 degrees, and the flushing port (356) on the fourth branch (353) of the inner tube (352) is aligned with the material port (354), and the other three flushing ports (356) are staggered with the material port (354); Each time the inner tube (352) rotates, the position of the flushing port (356) is adjusted, so that water is introduced into the four filter spaces in sequence, and the four filter spaces are cleaned separately; When the inner tube (352) rotates 72 degrees again, the inner tube (352) returns to its original position.

5. The high-efficiency membrane separation equipment for wastewater from copper citrate production according to claim 1, characterized in that: The adjustment joint (6) comprises a rotor (61) and a shell (62) rotating on the rotor (61), and the rotor (61) is guided out of the shell (62), and both ends of the rotor (61) are in contact with the shell (62) via a rotary seal, and one end of the rotor (61) is provided with a channel (63) communicating with the material pipe (35), and the interior of the shell (62) is provided with a cavity (65) communicating with a port (64) on the shell (62), and the rotor (61) is provided with a through opening located at the communicating cavity (65), and the adjustment device (9) is connected to the other end of the rotor (61) to drive the material pipe (35) to be adjusted.

6. A high-efficiency membrane separation method for wastewater from copper citrate production, characterized in that: The high-efficiency membrane separation device for waste liquid from copper citrate production according to any one of claims 1 to 5 is specifically operated as follows: S1, copper citrate waste liquid is introduced into the filter cartridge (2) through the injection pipe (5), the water flow drives the driving structure (4) to operate, so that the driving structure (4) drives the ultrafiltration membrane (3) to move back and forth in the filter cartridge (1), and the copper citrate waste liquid flows from the filter cartridge (2) into the filter cartridge (1) and passes through the ultrafiltration membrane (3); S2, the copper citrate waste liquid passes through a plurality of groups of filter membrane tubes (33) on the piston (32). When the copper citrate waste liquid passes through the filter membrane tubes (33), a portion of the water therein is separated through the filter membrane tubes (33) and enters the membrane cylinder (31), while the remaining copper citrate waste liquid is guided out from another piston (32) through the filter membrane tubes (33), enters the end of the filter membrane cylinder (1), and is discharged from the water outlet (12); S3, the water in the membrane cylinder (31) is sucked out through the material pipe (35), so that the water is discharged from the hose (7) through the adjustment joint (6) and discharged through the interface (8); S4. During backwashing, water is introduced from the interface (8) and introduced into the adjustment joint (6) through the hose (7), and then introduced into the interior of the ultrafiltration membrane (3) through the material pipe (35). The material pipe (35) is adjusted through the regulating device (9) so that the water is introduced into the four filter spaces of the ultrafiltration membrane (3) one by one. The water reversely permeates in the four filter spaces to wash away the stains inside the filter membrane tube (33).

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