CN118063018A - Wastewater treatment is used for well water film system - Google Patents

Abstract

The invention discloses a wastewater treatment system for a reclaimed water membrane system, which relates to the technical field of wastewater treatment, including a coarse filtration separation mechanism, a pressurizing mechanism connected to the bottom of the coarse filtration separation mechanism, a filter press mechanism connected to the pressurizing mechanism and running in cooperation with the pressurizing mechanism, and a star-shaped pressurizing box connected to the coarse filtration separation mechanism through a flange, a second rotary motor fixedly installed at the bottom center of the star-shaped pressurizing box, an output end of the second rotary motor extending into the inner cavity of the star-shaped pressurizing box and fixedly connected to a rotating counterweight, a rotating counterweight rotatably connected to a turntable at the square head end, a plurality of annularly distributed fixed shafts fixedly connected to the upper surface of the turntable, each fixed shaft is rotatably connected to a connecting rod, and each connecting rod is rotatably connected to a piston at one end away from the turntable, and each piston is slidably installed in a branch pipe of the star-shaped pressurizing box. The wastewater treatment system is used for a reclaimed water membrane system, so that wastewater can be filtered through a reverse osmosis membrane faster, thereby improving the filtration efficiency.

Description

A wastewater treatment system for reclaimed water membrane

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment system for a reclaimed water membrane.

Background technique

In industrial production, a large amount of wastewater is often generated, and the wastewater needs to be strictly treated before it can be discharged. Existing sewage treatment equipment usually uses reverse osmosis membranes for filtration treatment, but if there is no continuously operating wastewater pressurization mechanism to be used in conjunction with the reverse osmosis membrane, it is difficult for the wastewater to pass through the reverse osmosis membrane, and the filtration efficiency is low.

For example, the existing announcement number is: CN216785914U, which is a wastewater treatment reverse osmosis device, which "includes a pre-treatment box, a purification box and a siphon down-pipe, the pre-treatment box and the purification box are connected by a siphon down-pipe; a support frame is arranged at the bottom of the pre-treatment box, the pre-treatment box has a coarse filter chamber and a sedimentation chamber arranged up and down, the coarse filter chamber is connected to a wastewater pipe, and a coarse filter screen is also arranged in the coarse filter chamber; a detachable movable plate is arranged in the purification box, the movable plate is located at the upper part of the purification box and a reverse osmosis membrane is arranged on the movable plate, and the bottom of the purification box is connected to a clean water outlet pipe". Although the patent adopts a reverse osmosis membrane for filtration treatment, it does not provide a wastewater pressurizing mechanism matched with the reverse osmosis membrane, making it difficult for wastewater to pass through the reverse osmosis membrane, and the filtration efficiency is low. Therefore, a new type of wastewater treatment is needed for the reclaimed water membrane system.

Summary of the invention

1. Technical issues to be solved

In view of the deficiencies in the prior art, the present invention provides a wastewater treatment method for a reclaimed water membrane system.

(II) Technical solution

To achieve the above object, the present invention provides the following technical solution: a wastewater treatment system for reclaimed water membrane, comprising a coarse filtration separation mechanism, the bottom of the coarse filtration separation mechanism is connected to a pressurizing mechanism, and the pressurizing mechanism is connected to a filter press mechanism that cooperates with the pressurizing mechanism;

The pressurizing mechanism comprises: a star-shaped pressurizing box connected with the coarse filtering and separating mechanism through a flange, a second rotating motor is fixedly installed at the bottom center of the star-shaped pressurizing box, an output end of the second rotating motor extends into the inner cavity of the star-shaped pressurizing box and is fixedly connected with a rotating counterweight block, a square head end of the rotating counterweight block is rotatably connected with a turntable, a plurality of annularly distributed fixed shafts are fixedly connected to the upper surface of the turntable, each of the fixed shafts is rotatably connected with a connecting rod, and each connecting rod is rotatably connected with a piston at one end away from the turntable, each of the pistons is slidably installed in a branch pipe of the star-shaped pressurizing box, and the number of annularly evenly distributed branch pipes of the star-shaped pressurizing box is the same as the number of pistons, a limiting column is coaxially fixedly connected to a side of each piston away from the connecting rod, each limiting column is slidably installed with a moving plug, and each moving plug is fixedly connected with a spring, each of the springs is fixedly connected to the circular plate end of the limiting column, a one-way valve is threadedly connected to the end of each branch pipe of the star-shaped pressurizing box, and each one-way valve is connected with a connecting pipe;

The filter press mechanism comprises: a filter press box whose inner cavity is connected with a plurality of connecting pipes, a rotating base is threadedly connected to the bottom of the filter press box, a filter element is threadedly connected to the center of the rotating base, and a ring-shaped bent reverse osmosis membrane is arranged in the annular cavity of the filter element.

As a preferred embodiment of the present invention, the turntable is rotatably connected to the rotating counterweight block through a rotating shaft at the bottom, the output end of the second rotating motor is coaxially fixedly connected with a sealed bearing, and the outer ring of the sealed bearing is fixedly connected to the star-shaped pressurizing box.

As a preferred embodiment of the present invention, each movable plug is provided with an annular protrusion for sealing the piston on the side facing the adjacent piston.

As a preferred embodiment of the present invention, the side wall of the filter element is made of two coaxial steel cylinders which are sleeved together, and both steel cylinders are provided with annularly distributed strip-shaped slits.

As a preferred embodiment of the present invention, a PP cotton layer is filled between the reverse osmosis membrane and the outer steel cylinder of the filter element, and an activated carbon layer is filled between the reverse osmosis membrane and the inner steel cylinder of the filter element.

As a preferred embodiment of the present invention, the coarse filtration separation mechanism includes: a coarse filtration box for preliminary solid-liquid separation, a collecting box is connected to the top notch of the coarse filtration box, the bottom of the coarse filtration box is connected to a collecting bucket, and the bottom of the collecting bucket is connected to a star-shaped pressurizing box.

As a preferred embodiment of the present invention, a placement bar is obliquely provided on two opposite side walls of the inner cavity of the coarse filter box, and the two placement bars extend to the top notch of the coarse filter box. A coarse filter is placed on the two placement bars together, and an annular guide rail is arranged in parallel above each of the placement bars, and a chain is slidably installed inside each of the annular guide rails, and a number of movable scrapers evenly distributed along the chains are installed on the two chains together, each of the chains is meshed with a toothed disc, and each toothed disc is coaxially fixedly connected to a first rotating motor.

As a preferred embodiment of the present invention, the inner cavity of the collection box is funnel-shaped, and the inner cavity is connected to the bent pipe at its bottom.

As a preferred embodiment of the present invention, both ends of each of the movable scrapers are fixedly connected to the chain plates of the chain, each of the annular guide rails is provided with a notch for the toothed disc to pass through, and each of the first rotating motors is fixedly mounted on the outer wall of the coarse filter box.

As a preferred embodiment of the present invention, a connecting ring is fixedly connected to the bottom of the star-shaped pressurizing box, and the connecting ring is fixedly connected to the top of the filter press box.

Beneficial Effects

Compared with the prior art, the present invention provides a wastewater treatment system for a reclaimed water membrane system, which has the following beneficial effects:

The wastewater treatment is used in the reclaimed water membrane system. During the coarse filtration, the first rotating motor drives the toothed disc to rotate, and the toothed disc drives the chain to slide in the inner cavity of the annular guide rail. The chain drives the moving scraper close to the coarse filter to move upward, scraping the solid impurities above the coarse filter, so that the solid impurities flow into the collection box, so that the solid impurities filtered out of the industrial wastewater can be discharged continuously, without the need for manual cleaning after running for a period of time, thereby improving the continuous operation capacity;

This wastewater treatment is used in the reclaimed water membrane system. During pressurization, when the piston moves away from the second rotating motor, the one-way valve opens, and the moving plug presses the annular groove of the piston, so that the piston can pressurize the water in the branch pipe of the star-shaped pressurizing box and squeeze it out from the one-way valve. When the piston moves toward the second rotating motor, the one-way valve opens and closes. Under the water pressure, the moving plug slides along the limit column, so that the moving plug is separated from the piston. The water in the center of the inner cavity of the star-shaped pressurizing box flows into the branch pipe through the annular groove of the piston. When enough water flows into the branch pipe, the water pressure is balanced. Under the pressure of the spring, the moving plug presses the annular groove of the piston. Several branches of the star-shaped pressurizing box can pressurize the water in turn, so that the pressurized water continuously flows into the filter press mechanism for filtration. Thanks to the continuous pressurization of the wastewater by the pressurizing mechanism, the wastewater can be filtered through the reverse osmosis membrane faster, which improves the filtration efficiency.

This wastewater treatment is used in the reclaimed water membrane system. During filtration, the water flowing into the filter press box passes through the PP cotton layer of the filter element, the reverse osmosis membrane and the activated carbon layer of the filter element in turn, then flows to the center of the filter element, and finally is discharged through the drain pipe at the bottom center of the rotating base. The reverse osmosis membrane adopts a bent and folded design to increase the contact area with water, thereby improving the filtration efficiency of the reverse osmosis membrane. Thanks to the multi-layer filtration of the PP cotton layer, reverse osmosis membrane and activated carbon layer, the quality of the filtered water is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG2 is a schematic diagram of the overall structure of an embodiment of the present invention from another angle;

FIG3 is an exploded view of a coarse filter separation mechanism without a coarse filter box, a collection box and a collection bucket according to an embodiment of the present invention;

FIG4 is an enlarged view of point A in FIG3 according to an embodiment of the present invention;

FIG5 is a schematic structural diagram of a pressurizing mechanism according to an embodiment of the present invention;

FIG6 is a schematic structural diagram of a pressurizing mechanism without a one-way valve and a connecting pipe according to an embodiment of the present invention;

FIG7 is an exploded view of the pressurizing mechanism without the star-shaped pressurizing box, the one-way valve and the connecting pipe according to the embodiment of the present invention;

FIG8 is an exploded view of a piston, a limiting column, a moving plug and a spring according to an embodiment of the present invention;

FIG9 is a schematic structural diagram of a movable plug according to an embodiment of the present invention;

FIG10 is an exploded view of a filter press mechanism according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view of a filter element and a reverse osmosis membrane according to an embodiment of the present invention.

In the figure:

1. Coarse filter separation mechanism; 101. Coarse filter box; 102. Collecting box; 103. Collecting bucket; 104. Placement bar; 105. Coarse filter screen; 106. Annular guide rail; 107. Chain; 108. Moving scraper; 109. Tooth disc; 110. First rotating motor;

2. Pressurizing mechanism; 201. Star-shaped pressurizing box; 202. One-way valve; 203. Connecting pipe; 204. Second rotating motor; 205. Sealed bearing; 206. Rotating counterweight; 207. Turntable; 208. Fixed shaft; 209. Connecting rod; 210. Piston; 211. Limiting column; 212. Moving plug; 213. Spring;

3. Filter press mechanism; 301. Filter press box; 302. Filter element; 303. Rotating base; 304. Reverse osmosis membrane;

4. Connecting ring.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Please refer to Figures 1-11, a wastewater treatment is used for a reclaimed water membrane system, including a coarse filtration separation mechanism 1, the bottom of the coarse filtration separation mechanism 1 is connected to a pressurizing mechanism 2, and the pressurizing mechanism 2 is connected to a filter press mechanism 3 that cooperates with the pressurizing mechanism 2. The pressurizing mechanism 2 presses the sewage after coarse filtration so that the sewage can quickly pass through the reverse osmosis membrane 304 of the filter press mechanism 3, thereby improving the filtration efficiency. A connecting ring 4 is fixedly connected to the bottom of the star-shaped pressurizing box 201, and the connecting ring 4 is fixedly connected to the top of the filter press box 301.

The coarse filtration separation mechanism 1 comprises: a coarse filtration box 101 for preliminary solid-liquid separation, and a collecting box 102 is connected to the top notch of the coarse filtration box 101. The notch at the top of the coarse filtration box 101 is aligned with the notch at the top of the collecting box 102, so as to facilitate the transfer of solid impurities from the coarse filtration box 101 to the collecting box 102. The bottom of the coarse filtration box 101 is connected to a collecting hopper 103, and the bottom of the collecting hopper 103 is connected to the star-shaped pressurizing box 201.

A placement bar 104 is obliquely arranged on two opposite side walls of the inner cavity of the coarse filter box 101, and the two placement bars 104 extend to the top notch of the coarse filter box 101, and a coarse filter screen 105 is placed on the two placement bars 104. The top frame of the coarse filter screen 105 is flush with the top notch of the coarse filter box 101. The coarse filter screen 105 is used to filter out solid impurities in industrial wastewater. An annular guide rail 106 is arranged in parallel above each placement bar 104, and a chain 107 is slidably installed inside each annular guide rail 106. The two chains 107 are jointly installed with a plurality of moving scrapers 108 evenly distributed along the chains 107, and each chain 107 is meshed with a toothed disc 109, and each toothed disc 109 is coaxially fixedly connected with a first rotating motor 110. The toothed disc 109 is meshed with the rotating shaft of the chain 107. An annular protrusion is provided in the middle of the rotating shaft of the chain 107, so that the chain 107 can slide in the inner cavity of the annular guide rail 106 and cannot be separated. When the first rotating motor 110 drives the toothed disc 109 to rotate, the toothed disc 109 drives the chain 107 to slide in the inner cavity of the annular guide rail 106, and the chain 107 drives the moving scraper 108 near the coarse filter 105 to move upward, scraping the solid impurities above the coarse filter 105, so that the solid impurities flow into the collection box 102.

The inner cavity of the collecting box 102 is funnel-shaped, and the inner cavity is connected to the bend at its bottom. The bend at the bottom of the collecting box 102 is connected to a solid waste treatment pipeline. The solid impurities flowing into the inner cavity of the collecting box 102 are continuously discharged through the bend at its bottom. Both ends of each movable scraper 108 are fixedly connected to the chain plates of the chain 107. The movable scraper 108 moves with the chain plates. Each annular guide rail 106 is provided with a notch for the toothed disc 109 to pass through. The toothed disc 109 engages with the chain 107 through the notch of the annular guide rail 106. Each first rotating motor 110 is fixedly mounted on the outer wall of the coarse filter box 101. The output end of the first rotating motor 110 passes through the side wall of the coarse filter box 101 and is coaxially fixedly connected to the toothed disc 109.

The pressurizing mechanism 2 includes: a star-shaped pressurizing box 201 connected to the coarse filtration separation mechanism 1 through a flange, and a second rotating motor 204 is fixedly installed at the bottom center of the star-shaped pressurizing box 201. Through holes are set at the four corners of the second rotating motor 204, and bolts passing through the through holes are threadedly connected to the star-shaped pressurizing box 201. The output end of the second rotating motor 204 extends into the inner cavity of the star-shaped pressurizing box 201 and is fixedly connected to a rotating counterweight 206. One end of the rotating counterweight 206 is semicircular and the other end is square, and the round end is heavier than the square end, and the round end serves as a counterweight. The square end of the rotating counterweight 206 is rotatably connected to a turntable 207, and the upper surface of the turntable 207 is fixedly connected to a plurality of annularly distributed fixed shafts 208, each of which is rotatably connected to a connecting rod 209, and each of which is rotatably connected to one end of the connecting rod 209 away from the turntable 207, and each of which is slidably connected to a piston 210, and each of which is slidably installed in a branch pipe of the star-shaped pressurizing box 201, and the number of annularly evenly distributed branch pipes of the star-shaped pressurizing box 201 is the same as the number of pistons 210. The piston 210 can reciprocate in the branch pipe of the star-shaped pressurizing box 201. Each piston 210 is coaxially fixedly connected to a limiting column 211 on one side away from the connecting rod 209, and each limiting column 211 is slidably installed with a moving plug 212, and each of which is fixedly connected to a spring 213, and each of which is fixedly connected to the circular plate end of the limiting column 211. When the piston 210 moves away from the second rotary motor 204, the one-way valve 202 opens, and the moving plug 212 presses the annular groove of the piston 210, so that the piston 210 can pressurize the water in the branch pipe of the star-shaped pressurizing box 201 and squeeze it out from the one-way valve 202. When the piston 210 moves toward the second rotary motor 204, the one-way valve 202 opens and closes. Under the water pressure, the moving plug 212 slides along the limit column 211, so that the moving plug 212 is separated from the piston 210, and the water in the center of the inner cavity of the star-shaped pressurizing box 201 flows into the branch pipe through the annular groove of the piston 210. When enough water flows into the branch pipe, the water pressure is balanced, and the moving plug 212 presses the annular groove of the piston 210 under the pressure of the spring 213. Each branch pipe end of the star-shaped pressurizing box 201 is threadedly connected with a one-way valve 202, and each one-way valve 202 is connected with a connecting pipe 203. The connecting pipe 203 is a pressure hose that can withstand the pressure of squeezing water through the one-way valve 202 through the piston 210. The one-way valve 202 can only discharge the water in the star-shaped pressurized box 201. A hexagonal nut is provided at one end of the one-way valve 202 away from the connecting pipe 203.

The turntable 207 is rotatably connected to the rotating counterweight 206 via a rotating shaft at the bottom. The turntable 207 cannot move along the axial direction of its own rotating shaft and can only rotate along the axis. The output end of the second rotating motor 204 is coaxially fixedly connected with a sealing bearing 205, and the outer ring of the sealing bearing 205 is fixedly connected to the star-shaped pressurizing box 201. Each movable plug 212 is provided with an annular protrusion for blocking the piston 210 on the side facing the adjacent piston 210. The annular protrusion of the movable plug 212 is provided with rounded corners to facilitate insertion into the annular groove of the piston 210. The annular protrusion of the movable plug 212 can be set to a rubber material to improve the sealing between the movable plug 212 and the piston 210.

The filter press mechanism 3 includes: a filter press box 301 whose inner cavity is connected to a plurality of connecting pipes 203, and a rotating base 303 is threadedly connected to the bottom of the filter press box 301. A drain pipe extends from the center of the bottom of the rotating base 303, which can be threadedly connected to other water pipes. A filter element 302 is threadedly connected to the center of the rotating base 303, and a circular bent reverse osmosis membrane 304 is arranged in the annular cavity of the filter element 302. The reverse osmosis membrane 304 requires a certain water pressure to quickly filter a certain amount of industrial wastewater. A hexagonal nut is arranged at the bottom of the filter element 302. The bent design of the reverse osmosis membrane 304 increases the contact area with water and improves the filtration efficiency of the reverse osmosis membrane 304. The side wall of the filter element 302 is made of two steel cylinders that are sleeved together and coaxial, and both steel cylinders are provided with strip-shaped slits distributed in an annular manner. Water flows in and out of the strip-shaped slits of the steel cylinder. A PP cotton layer is filled between the reverse osmosis membrane 304 and the outer steel cylinder of the filter element 302, and an activated carbon layer is filled between the reverse osmosis membrane 304 and the inner steel cylinder of the filter element 302. In order to show the structure of the reverse osmosis membrane 304 and the filter element 302, the PP cotton layer and the activated carbon layer are not drawn in the drawings of the specification. The water flowing into the filter press box 301 is pressurized by the pressurizing mechanism 2, passes through the PP cotton layer of the filter element 302, the reverse osmosis membrane 304 and the activated carbon layer of the filter element 302 in turn, then flows to the center of the filter element 302, and finally is discharged through the drain pipe at the bottom center of the rotating base 303. During maintenance, the rotating base 303 can be unscrewed first, and then the filter element 302 can be unscrewed for replacement.

working principle:

The wastewater treatment is used in the reclaimed water membrane system. During the coarse filtration, industrial wastewater is continuously poured into the coarse filter box 101, and the solid impurities are retained above the coarse filter screen 105. The water flows into the collection bucket 103 and then flows into the inner cavity of the star-shaped pressurizing box 201. At this time, the first rotating motor 110 drives the toothed disc 109 to rotate, and the toothed disc 109 drives the chain 107 to slide in the inner cavity of the annular guide rail 106. The chain 107 drives the moving scraper 108 close to the coarse filter screen 105 to move upward, scraping the solid impurities retained above the coarse filter screen 105, so that the solid impurities flow into the collection box 102. The solid impurities flowing into the inner cavity of the collection box 102 are continuously discharged through the curved pipe at the bottom thereof;

During pressurization, water flows into the center of the inner cavity of the star-shaped pressurizing box 201, and the second rotary motor 204 drives the rotary counterweight 206 to rotate. The rotary counterweight 206 drives the turntable 207 to make a circular motion, so that the turntable 207 drives the piston 210 in the branch pipe of the star-shaped pressurizing box 201 to make a reciprocating motion through the fixed shaft 208 and the connecting rod 209. When the piston 210 moves away from the second rotary motor 204, the one-way valve 202 opens, and the moving plug 212 presses the annular groove of the piston 210, so that the piston 210 can pressurize the branch pipe of the star-shaped pressurizing box 201. The water is pressurized and squeezed out from the one-way valve 202. The squeezed water is pressed into the filter press box 301 through the connecting pipe 203. When the piston 210 moves toward the direction close to the second rotary motor 204, the one-way valve 202 is opened and closed. Under the water pressure, the movable plug 212 slides along the limit column 211, so that the movable plug 212 is separated from the piston 210. The water in the center of the inner cavity of the star-shaped pressurizing box 201 flows into the branch pipe through the annular groove of the piston 210. When enough water flows into the branch pipe, the water pressure is balanced, and the movable plug 212 presses the annular groove of the piston 210 under the pressure of the spring 213.

During pressure filtration, the water pressurized by the pressurizing mechanism 2 flows into the filter press box 301. Under the action of pressure, the water in the inner cavity of the filter press box 301 flows from the outside of the filter element 302 to the center, passes through the PP cotton layer of the filter element 302, the reverse osmosis membrane 304 and the activated carbon layer of the filter element 302, and is finally discharged through the drain pipe at the bottom center of the rotating base 303.

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims (10)

1. A wastewater treatment for a water membrane system comprising a coarse filtration separation mechanism (1), characterized in that: the bottom of the coarse filtration separation mechanism (1) is communicated with a pressurizing mechanism (2), and the pressurizing mechanism (2) is communicated with a filter pressing mechanism (3) which is matched with the pressurizing mechanism (2) to operate;

The pressurizing mechanism (2) includes: the star-shaped pressurizing box (201) is communicated with the rough filtration separating mechanism (1) through a flange, a second rotating motor (204) is fixedly installed at the center of the bottom of the star-shaped pressurizing box (201), the output end of the second rotating motor (204) stretches into the inner cavity of the star-shaped pressurizing box (201) and is fixedly connected with a rotating balancing weight (206), the square head end of the rotating balancing weight (206) is rotationally connected with a rotary table (207), the upper surface of the rotary table (207) is fixedly connected with a plurality of annularly distributed fixed shafts (208), each fixed shaft (208) is rotationally connected with a connecting rod (209), one end of each connecting rod (209) far away from the rotary table (207) is rotationally connected with a piston (210), each piston (210) is slidably installed in a branch pipe of the star-shaped pressurizing box (201), the number of the branch pipes of the ring-shaped uniformly distributed star-shaped pressurizing box (201) is the same as that of the pistons (210), one side of each piston (210) far away from the connecting rod (209) is coaxially and fixedly connected with a limiting column (211), each limiting column (212) is fixedly connected with a spring (213) and each spring (213) is fixedly connected with each spring (213), each branch pipe end part of the star-shaped pressurizing box (201) is in threaded connection with a one-way valve (202), and each one-way valve (202) is communicated with a connecting pipe (203);

The filter pressing mechanism (3) comprises: the inner cavity is with filter-pressing case (301) of a plurality of connecting pipes (203) intercommunication, the bottom threaded connection of filter-pressing case (301) has rotating base (303), rotating base (303) center threaded connection has filter core (302), and is provided with reverse osmosis membrane (304) that the annular bend was folded in the annular cavity of filter core (302).

2. A wastewater treatment plant for use in a water membrane system according to claim 1, wherein: the rotary table (207) is rotationally connected with the rotary balancing weight (206) through a rotary shaft at the bottom, the output end of the second rotary motor (204) is coaxially and fixedly connected with a sealing bearing (205), and the outer ring of the sealing bearing (205) is fixedly connected with the star-shaped pressurizing box (201).

3. A wastewater treatment plant for use in a water membrane system according to claim 1, wherein: the side of each movable plug (212) facing the adjacent piston (210) is provided with an annular bulge for plugging the piston (210).

4. A wastewater treatment plant for use in a water membrane system according to claim 1, wherein: the side wall of the filter element (302) is made of two steel cylinders which are sleeved together and coaxial, and the two steel cylinders are provided with strip-shaped slits which are distributed annularly.

5. A wastewater treatment plant for use in a water membrane system according to claim 4, wherein: a PP cotton layer is filled between the reverse osmosis membrane (304) and the outer steel cylinder of the filter element (302), and an active carbon layer is filled between the reverse osmosis membrane (304) and the inner steel cylinder of the filter element (302).

6. A wastewater treatment plant for use in a water membrane system according to claim 1, wherein: the rough filtration separation mechanism (1) comprises: a coarse filtration case (101) for preliminary solid-liquid separation, the top breach department of coarse filtration case (101) is connected with collection case (102), the bottom intercommunication of coarse filtration case (101) has collection fill (103), and collection fill (103) bottom and star pressurization case (201) intercommunication.

7. A wastewater treatment plant for use in a water membrane system according to claim 6, wherein: two opposite side walls of an inner cavity of the coarse filtration tank (101) are respectively provided with a placement strip (104) in an inclined mode, the two placement strips (104) are all extended to a top notch of the coarse filtration tank (101), coarse filtration screens (105) are commonly placed on the placement strips (104), an annular guide rail (106) is arranged above each placement strip (104) in parallel, a chain (107) is slidably installed inside each annular guide rail (106), a plurality of movable scraping plates (108) which are uniformly distributed along the chain (107) are commonly installed on each chain (107), a dental tray (109) is meshed on each chain (107), and a first rotating motor (110) is coaxially and fixedly connected to each dental tray (109).

8. A wastewater treatment plant for use in a water membrane system according to claim 6, wherein: the inner cavity of the collecting box (102) is funnel-shaped, and the inner cavity is communicated with the bottom bent pipe of the collecting box.

9. A wastewater treatment plant for use in a water membrane system according to claim 7, wherein: each of the two ends of the movable scraping plate (108) is fixedly connected with a chain plate of a chain (107), each annular guide rail (106) is provided with a notch for a dental tray (109) to penetrate, and each first rotating motor (110) is fixedly installed on the outer wall of the coarse filtration tank (101).

10. A wastewater treatment plant for use in a water membrane system according to claim 1, wherein: the bottom of the star-shaped pressurizing box (201) is fixedly connected with a connecting ring (4), and the connecting ring (4) is fixedly connected with the top of the filter pressing box (301).