CN110550754A - Membrane method sewage treatment system - Google Patents

Abstract

The invention discloses a membrane-based sewage treatment system, which includes a filter tank; a filter device, which includes a membrane frame arranged in the filter tank, a filter membrane arranged on the membrane frame, and a filter connected to the filter membrane. A water collection pipe and a suction piece connected with the water collection pipe; a filter material layer arranged in the filter tank, a plurality of cleaning parts are arranged in the filter material layer, and the cleaning parts can be cleaned under the action of air flow and/or water flow; Disorderly tumbling impacts the filter membrane, and then the filter membrane is cleaned; the present invention makes the cleaning effect of the filter membrane better, the cleaning efficiency is high, and the consumption of water resources and energy is reduced. No need to use chemicals, avoiding water quality and environmental pollution, reducing the damage rate of the filter membrane and prolonging the service life of the filter membrane; the filter material layer makes the water purification effect better and prolongs the service life of the filter membrane , reducing the backwash frequency of the filter membrane.

Description

A membrane wastewater treatment system

technical field

The invention belongs to the technical field of water treatment, and in particular relates to a membrane sewage treatment system.

Background technique

In the past membrane filtration water treatment technology, pre-dosing and mixing are usually used to flocculate the flocculant and the colloidal impurities in the water into tiny particles, and then use the filter membrane to intercept and filter. After the filter works to a certain degree of blockage of the membrane, the It is necessary to implement surface cleaning and chemical cleaning of the filter membrane to restore the filtration function of the filter membrane.

Most of the traditional membrane cleaning methods use air flushing or water flushing of the pollutants on the membrane surface, but no matter whether it is air flushing or water flushing on the surface of the filter membrane, the pollution adhering to the membrane surface cannot be removed due to the lack of friction on the surface of the filter membrane. If the cleaning effect is poor, there will always be some dirt adhering to the surface of the filter membrane, so that the water purification filter membrane cannot restore the normal filtering function, resulting in shortened filtration work cycle and reduced filtration efficiency. Over time, the filter membrane gradually Weaken or even block the micropores on the surface of the filtration membrane and lose the filtration effect; and in order to restore the filtration function of the membrane, the membrane module must be hung in a strong acid and strong alkali chemical pool for soaking and cleaning every time it is used. Therefore, the water quality (especially drinking water) and have a great impact on the ecological environment.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a membrane sewage treatment system.

In order to achieve the above object, the present invention adopts the following technical solutions: a membrane sewage treatment system, comprising

filter;

Filtration device, including a membrane holder arranged in the filter tank, a filter membrane arranged on the membrane holder, a water collection pipe connected with the filter membrane, and a suction piece connected with the water collection pipe;

The filter material layer arranged in the filter tank, the filter material layer is provided with a plurality of cleaning parts, and the cleaning parts can roll and impact the filter membrane disorderly under the action of air flow and/or water flow, and then the filter membrane to clean;

Through the setting of the cleaning parts, when the filter membrane needs to be cleaned, the cleaning parts can make irregular tumbling motions in the three-dimensional trajectory in the filter tank under the action of air flow and/or water flow, and driven by the gas, The gas, water flow and cleaning parts continuously impact on the filter membrane together, and the dirt attached to the surface of the filter membrane is impacted and rubbed by the impact force of the gas and water flow and the friction of the cleaning parts, so that the cleaning effect is better and the filter membrane is guaranteed It can restore the normal filtering function, has high cleaning efficiency, reduces the consumption of water resources and energy, and does not need to use chemicals to clean the filter membrane, which avoids water quality and environmental pollution, reduces the damage rate of the filter membrane, and prolongs the filtration time. The service life of the membrane; while the dirt attached to the cleaning parts will collide and rub against each other due to the disorderly rolling motion of the cleaning parts in the three-dimensional trajectory in the filter tank during backwashing, so that the cleaning parts will collide and rub against each other. The dirt adhering to the cleaning piece is removed, thereby ensuring that the cleaning piece can clean up the dirt adhering to the filter membrane, and at the same time, the filter material layer formed by the cleaning piece standing still has a good auxiliary filtering effect all the time.

Further, it also includes a gas source assembly for transporting gas into the filter tank; through the arrangement of the above structure, the three-dimensional and disorderly tumbling movement of the cleaning parts in the filter tank is realized, the driving method is simple, and the equipment cost is reduced. Cost and energy consumption; at the same time, the gas engulfs the water and the cleaning parts and continuously impacts on the filter membrane, realizing multiple dynamic cleaning of the filter membrane by air washing + water washing + scrubbing, with better cleaning effect and higher cleaning efficiency. Reduced water and energy consumption.

Further, it also includes a flushing assembly for allowing the filter membrane to discharge water from the inside to the outside; through the setting of the above-mentioned structure, the filter membrane can be reversed and outwardly pressed to ooze water, and the filter holes on the filter membrane can be dredged. It has a better cleaning effect on the filter membrane; at the same time, after the cleaning part wipes off part of the dirt on the filter membrane, a large amount of dirt will adhere to itself, and its own kinetic energy will lose a lot. At this time, the reverse osmosis The water flow will push the cleaning parts that have lost kinetic energy away from the filter membrane, making room for the subsequent cleaning parts, so that the subsequent cleaning parts can continue to remove the dirt on the surface of the filter membrane, and the cleaning effect on the filter membrane is better At the same time, the cleaning parts pushed away by the water flow will collide and rub against other cleaning parts under the action of air flow and water flow, thereby removing the dirt attached to the cleaning parts, so that the cleaning parts always have better cleaning ability.

Further, the flushing assembly includes a water inlet pipe connected to the water collection pipe and a water supply member connected to the water inlet pipe; through the arrangement of the above structure, water can be delivered to the filter membrane, so that the filter membrane can The water seeps outward in reverse, and the filter holes on the filter membrane are dredged.

Further, the filter tank includes a filter area, a mud collection area and an interlayer arranged between the filter area and the mud collection area, and the filter material layer and the filter membrane are both arranged in the filter area Inside; through the setting of the above structure, the filter tank is divided into a filter area and a mud collection area, so that the dirt obtained by backwashing can be collected and processed in a unified manner, so as to avoid the dirt from affecting the normal treatment of sewage by the filter device and ensure that the equipment Always have better water purification effect.

Further, the air source assembly includes an air outlet pipe arranged in the mud collection area, an air inlet pipe with one end connected to the air outlet pipe, and an air supply member connected with the other end of the air inlet pipe; through the above The structure is set to transport the air into the filter tank, the structure is simple and the work is stable.

Further, the interlayer is provided with a plate hole; the air outlet pipe is provided with an air outlet corresponding to the plate hole; through the setting of the above structure, the dirt can settle to the mud collection area through the plate hole, The collection is more convenient; the gas ejected from the outlet pipe can directly act on the cleaning parts without being blocked by the interlayer, and has a stronger impact force, which can better drive the water flow and the cleaning parts to impact on the filter membrane , the cleaning effect is better.

Further, the end of the air intake pipe close to the air supply part is higher than the side wall of the filter tank; through the setting of the above structure, even if no valve is set, the sewage will not flow backward, which reduces the equipment cost and ensures Service life of the air supply.

Further, the mud collecting area is provided with a mud collecting surface, and the mud collecting surface is an inclined surface, so that the dirt can be gathered at the bottom of the mud collecting area along the mud collecting surface for easy discharge.

Further, the cleaning element is arranged in a granular structure, which has better cleaning and filtering effects.

In summary, the present invention, through the arrangement of the cleaning parts, makes the cleaning effect of the filter membrane better, the cleaning efficiency is high, the consumption of water resources and energy is reduced, and the use of chemicals is not required, so that the pollution of water quality and the environment is avoided. It reduces the damage rate of the filter membrane and prolongs the service life of the filter membrane; the filter material layer makes the water purification effect better, prolongs the service life of the filter membrane, and reduces the backwash frequency of the filter membrane.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of embodiment 1 of the present invention;

Fig. 2 is the enlarged schematic diagram of place A in Fig. 1;

FIG. 3 is a schematic diagram of a transverse cross-sectional structure of Embodiment 1 of the present invention;

Fig. 4 is the enlarged schematic diagram of place B in Fig. 3;

Fig. 5 is a schematic diagram of a longitudinal three-dimensional cross-sectional structure of Embodiment 1 of the present invention;

Fig. 6 is the enlarged schematic diagram of place C in Fig. 5;

FIG. 7 is a schematic diagram of a transverse cross-sectional structure of Embodiment 2 of the present invention;

Fig. 8 is the enlarged schematic view of place A in Fig. 7;

Fig. 9 is a schematic diagram of a longitudinal three-dimensional cross-sectional structure of Embodiment 2 of the present invention;

Fig. 10 is an enlarged schematic diagram of place B in Fig. 9;

11 is a schematic diagram of the three-dimensional structure of the air flushing filter head in Example 2 of the present invention;

Fig. 12 is a schematic perspective view of the three-dimensional sectional structure of the air flushing filter head in Example 2 of the present invention;

Fig. 13 is a schematic diagram of the three-dimensional structure of the mud discharge filter head in Embodiment 2 of the present invention.

Detailed ways

Example 1:

As shown in Figures 1-6, a membrane sewage treatment system includes a filter tank 1, a filter device and a backwash device; in this embodiment, the filter tank 1 is made of cement and has a hollow cubic structure with an opening above it. Open, in other embodiments, filter tank also can be made of metal material or other materials; Wherein, filter device comprises connecting pipe 20, membrane holder 21, filter membrane 22, water collecting pipe 23, suction piece 24 and water outlet valve 25; The filter membrane 22 is installed on the connecting pipe 20, and the connecting pipe is installed on the membrane frame 21. The two are detachably connected, which is convenient for disassembly, maintenance and replacement. What is used in this embodiment is plugging; The purchased mesoporous membrane is a prior art, so it will not be described in detail here; the holes at both ends of the filter membrane are communicated with the connecting pipe 20 and sealed so that the channels in the filter membrane can be connected with the connecting pipe; The frame 21 is installed in the filter tank 1, so that the filter membrane 22 is submerged by the sewage; the water collecting pipe 23 is installed on the film frame, and one end of it is connected with the connecting pipe 20, so that the clear water obtained by filtering the filter membrane can enter the water collecting pipe and collect The other end of the water pipe is connected with the clear water tank 3, so that the clear water in the water collecting pipe can be transported to the clear water tank 3 for subsequent treatment; the suction member 24 acts on the water collecting pipe, so that the water collecting pipe is close to one side of the filter membrane. Negative pressure is formed on the side of the filter to suck the sewage in the filter 1 to the filter membrane 22, so that the sundries in the sewage are blocked by the filter membrane, and the clean water can enter the channel in the filter membrane through the filter holes on the filter membrane, and then Into the water collecting pipe 23 through the connecting pipe 20, and then enter the clear water pool 3 by the water collecting pipe; in the present embodiment, the suction part 24 is a variable frequency suction pump purchased on the market, which is a prior art, so here I won’t go into details, so the drawings in the description are not drawn in detail, and only a cube is drawn as a schematic. It should be noted that the size of some structures in the drawings is specially enlarged for clarity, not the actual size in production and application. Similar pumps or motors etc. are also the same; this variable frequency suction pump is installed on the water collection pipe 23; a water outlet valve 25 is also installed on the water collection pipe to control the on-off of the water collection pipe, and this water outlet valve is purchased on the market Stop valve, this is the prior art, so it will not be described in detail here. In other embodiments, the water outlet valve can also be an electric valve, which is more convenient and labor-saving to use; Under the condition of water requirement, it can directly flow into the clear water pool through the gravity of the transcending tube, so as to achieve the purpose of saving energy and reducing consumption.

Specifically, the backwashing device includes a flushing assembly and an air source assembly; wherein, the flushing assembly includes a water supply part 31, a water inlet pipe 32, and a water inlet valve 33; the water supply part 31 is installed in the clear water tank 3, and the water supply part is a The purchased water pump is a prior art, so it will not be described in detail here; one end of the water inlet pipe 32 is connected with the output end of the water supply part, and the other end is connected with the water collection pipe 23, and the connection point is located at the water outlet valve 25 near the filter membrane 22- On the pipe section on the side; Water inlet valve 33 is installed on the water inlet pipe, and this water inlet valve is the cut-off valve that buys on the market, and this is prior art, so do not go into details here; In filter tank 1, placed numerous Cleaning part 34, the cleaning part 34 is a filter material (in order to express more clearly in Figure 5 and Figure 6 of the accompanying drawings, the size of the cleaning part is enlarged, and the actual size is subject to actual application), specifically, in this application The filter material is a ceramic particle filter material, which is arranged in a spherical structure. In other embodiments, it can also be set in other structural shapes such as a cylindrical structure, an ellipsoid structure, and a drop-shaped structure; multiple filter materials are placed in the filter tank. , so that in the normal sewage filtration treatment process, the filter material sedimentation is laid in the filter tank to form a filter material layer 39 (in the accompanying drawings Fig. 3 and Fig. 4 of the description, for the convenience of drawing and the clarity of the drawings, the filter material layer is only a schematic diagram, and The shape of the filter material in the filter material layer is not drawn in detail), the filter membrane 22 is at least partially buried in the filter material layer, so that the dirt in the sewage can be absorbed and intercepted by the filter material, and the filtering effect is better. The process that the filter membrane is blocked by dirt prolongs the working time and service life of the filter membrane; in other embodiments, the filter material can also be other sand filter materials or granular or block filter materials; When the high-pressure gas is delivered to the filter tank 1, the cleaning parts (filter material) in the filter tank will make irregular and three-dimensional tumbling movements in the filter tank under the impact of the high-pressure gas, that is, the filter material is in the high-pressure gas Under the carrying and pushing of the filter, while moving and ups and downs in the filter tank, it is also rolling, and the filter materials will collide with each other, and the collision will make the motion track of the filter material more disordered, while the filter material The collision between them not only makes the movement of the filter material more violent and disordered, but also enables the debris adhering to the filter material to be removed by friction; the gas carries the water and the filter material together and randomly impacts on the filter membrane. Above, the three-dimensional mixed friction cleaning of air washing + water washing + sand washing is formed on the filter membrane, so that the impurities attached to the filter membrane can be removed under the impact of air flow and water flow and the friction of the filter material. The cleaning effect is better.

After the filter membrane 22 has been used for a period of time, a lot of debris will be attached to the filter membrane, causing the filter membrane to be blocked to a certain extent. At this time, it is necessary to open the backwash device to backwash the filter membrane so that the filter membrane can be restored. Filtration function; specifically, when backwashing is required, the suction member 24 is closed, and the water collection pipe 23 is cut off with the water outlet valve 25, so that the water cannot flow into the clear water pool 3, but can flow to the filter membrane 22; at this time, open the water inlet valve 33, so that the water inlet pipe 32 is connected with the water collection pipe, and then start the water supply part 31, the water supply part will pump the clear water in the clean water tank 3 into the water inlet pipe 32, then enter the connecting pipe 20 through the water collection pipe, and then enter the In the channel on the filter membrane 22 connected by the connecting pipe, it finally flows out from the filter holes on the filter membrane, so that part of the debris attached to the filter membrane can be washed away; at the same time, the air source component is sent to the filter tank to deliver high pressure Gas, the cleaning parts (filter materials) in the filter will make irregular and three-dimensional rolling motions in the filter under the action of high-pressure gas, and the collision between the filter materials not only makes the movement of the filter materials It is more violent and disordered, and also enables the debris adhering to the filter material to be removed by friction; the gas carries water and the filter material together and impacts on the filter membrane irregularly, forming air washing + water washing + The three-dimensional mixed cleaning of sand washing enables the impurities attached to the filter membrane to be removed under the impact of the air flow and water flow and the friction of the filter material, and the cleaning effect on the filter membrane is better; among them, in the water supply part 31 The water flowing out from the filter membrane 22 under the action makes the cleaning part 34 not stick on the filter membrane all the time, avoiding the filter membrane from being damaged, but the cleaning part impacts on the filter membrane under the coercion of the air flow, and the After part of the dirt is rubbed off, the kinetic energy given to the cleaning piece by the airflow is gradually weakened, and then the cleaning piece will move away from the filter membrane under the action of the water flow out of the filter membrane (that is, the driving force of the water flow out of the filter membrane Less than the driving force of the airflow, the cleaning parts need to lose most of the kinetic energy in the process of impacting and rubbing the filter membrane before being pushed away by the water flow), and collide with the rest of the cleaning parts, so that when the filter membrane is scrubbed, it is attached to the cleaning The dirt on the cleaning parts can be peeled off when the cleaning parts collide with each other; at the same time, the airflow carries other cleaning parts and continues to impact on the filter membrane one after another, performing continuous dynamic cleaning on the filter membrane; Transport high-pressure gas inside, close the water inlet valve and water supply parts, then start the suction part and open the water outlet valve to restart the sewage treatment.

Concretely, the air source assembly includes an air supply part 35, an air inlet pipe 36 and an air outlet pipe 37; an interlayer 38 is installed in the filter tank 1, and the interlayer divides the filter tank 1 into a filter area 11 and a mud collection area 12, and the membrane The frame 21 is promptly installed on the interlayer and is located in the filter area, and the cleaning parts 34 are also laid on the interlayer, located in the filter area above the interlayer, and a filter material layer is laid on the interlayer; A plurality of plate holes 381, the plate holes can pass through for air and dirt, but the cleaning parts 34 cannot pass through; a plurality of air outlet pipes 37 are installed below the interlayer, and a plurality of air outlet holes 371 are provided on the water outlet pipe, and the air outlet holes are located at Above the water outlet pipe, preferably, the air outlet hole 371 is facing the plate hole 381, so that the airflow ejected from the air outlet hole can pass through the plate hole on the interlayer more smoothly, and the impact force is more sufficient, which can better The cleaning part rushes up; one end of the air intake pipe 36 communicates with the air outlet pipe 37, and the other end stretches out from the filter tank 1, and communicates with the output end of the air supply part 35 installed outside the filter tank, so that the air intake pipe is positioned at the outside of the filter tank The nozzle is higher than the pool wall of the filter, so there is no need to install a one-way valve on the air outlet, and there is no need to worry that the sewage will be discharged countercurrently through the inlet pipe, which greatly reduces the equipment cost and installation difficulty; the air supply part 35 is the air purchased on the market The compressor can provide a sufficient amount of high-pressure air, which is a prior art, so it will not be described in detail here.

Preferably, a plurality of protrusions 382 are provided around the plate hole 381, the protrusions are formed by extending outward from at least part of the upper surface of the partition 38 located around the plate hole 381, and there is a gap between two adjacent protrusions. Therefore, after the air supply part 35 stops working, when the cleaning part 34 settles on the interlayer 38, the plate hole 381 will not be blocked, ensuring that the dirt can enter the mud collection area 12 smoothly through the plate hole.

Further, the bottom of the mud collection area 12 is provided with a mud collection surface 121, which is opened in an inclined state, so that the dirt (mainly mud-water mixture) entering the mud collection area can flow downward along the mud collection surface, and finally Collected in the mud discharge tank 13, which is set at the bottom of the mud collection area; the mud discharge tank 13 is connected with a mud discharge pipe 14, and a mud discharge valve 15 is installed on the mud discharge pipe; when the mud discharge tank When a lot of dirt has collected, open the sludge discharge valve, and the sludge will be discharged along the sludge discharge pipe under the action of the water pressure in the filter tank 1, without additional installation of a sludge discharge pump, which reduces equipment costs.

Example 2:

As shown in Figures 7-13, the difference between this embodiment and Embodiment 1 is that the air source assembly includes an air supply part 35, an air intake pipe 36, and a filter head plate 4; the filter head plate 4 includes a plate body 41, an air flush filter Head 42 and mud discharge filter head 43; plate body 41 is installed in the filter tank 1, and the plate body and the pool wall of the filter tank are sealed and fit, and the filter tank 1 is divided into a filter area 11 and a mud collection area 12, and the membrane frame 21 is Installed on the plate body, located in the filter area, the cleaning element 34 is also laid on the plate body 41, located in the filter area above the plate body, and a filter material layer is laid on the plate body; one end of the air inlet pipe 36 is connected to the mud collecting area 12 is connected, the nozzle is close to the lower surface of the plate body 41, and the other end extends out of the filter tank 1, and communicates with the output end of the air supply part 35 installed outside the filter tank, so that the air inlet pipe is located at the nozzle outside the filter tank It is higher than the pool wall of the filter, so that even if a check valve is not installed at the mouth of the inlet pipe located in the mud collection area, there is no need to worry about the sewage being discharged back through the inlet pipe, which reduces equipment cost and installation difficulty; air supply parts 35 is an air compressor or an air pump purchased on the market, which can provide a sufficient amount of high-pressure air, which is a prior art, so it will not be described in detail here; a plurality of mounting holes 411 are provided on the plate body 41, and the air flushing filter head 42 And mud discharge filter head 43 promptly is installed on the plate body through this installation hole, and a plurality of air flushing filter head 42 and mud discharge filter head 43 are evenly installed on the plate body, and a plurality of air flushing filter head 42 and mud discharge filter head 43 They are installed sequentially and staggered with each other.

Specifically, the air flushing filter head 42 includes an air flushing filter rod 421, an air flushing head cover 422, an air flushing gasket 423, an air flushing fastener 424 and an air flushing filter pocket 425; the air flushing filter rod 421 has a hollow cylindrical structure Open, the air flushing filter rod 421 is connected with the air flushing head cover 422, and the two are integrally formed, the air flushing filter rod can pass through the mounting hole 411 on the plate body 41, and the air flushing head cover cannot pass through Mounting holes; the end of the air flushing filter rod close to the air flushing head cover is provided with external threads, and the air flushing fastener is in the shape of a regular hexagon, on which there is a through hole 4241 for the air flushing filter rod to pass through, and the inner wall of the through hole There is an internal thread on the top, so that the air flushing fastener and the air flushing filter rod can form a threaded connection; when installing, the air flushing gasket 423 is sleeved on the air flushing filter rod, and then the air flushing filter rod is inserted into the installation hole 411, and then put an air flushing gasket on the air flushing filter rod, and finally screw the air flushing fastener and the air flushing filter rod to complete the installation and fixation of the air flushing filter head, and at the same time the air flushing filter A sealing fit is also formed between the head and the plate body 41, so that both gas and water cannot pass through the mounting hole where the air flushing filter head is installed; the air flushing filter pocket 425 is threaded on the air flushing filter rod 421 away from the air flushing head cover On one end of 422, after the air flushing fasteners fix the air flushing filter rod on the plate body 41, the air flushing filter pocket 425 can be screwed on the lower end of the air flushing filter rod; in other embodiments, the air flushing The filter bag can also be integrally formed with the air flushing filter rod, but the diameter is smaller than the mounting hole 411.

Further, the air punch head cover 422 includes a cover 4221 in an arc shape and a cover bottom 4222 connected to the cover, and a plurality of air punch slits 4223 are opened on the cover, and the air punch slits are along the outer surface of the cover. The circumferential direction is uniformly opened, and the cleaning part 34 cannot pass through the air flushing gap; a plurality of air flushing channels 4224 are provided on the cover bottom 4222, and the air flushing channels are evenly opened along the circumferential direction of the cover bottom; preferably, the air flushing channels are radially inclined. The bottom is opened, so that the gas can be ejected obliquely downward along the air blast channel, so that the cleaning parts 34 that are statically laid on the plate body 41 are easier to be raised under the impact of the gas, forming a three-dimensional, disorderly tumbling state , to play a better cleaning effect on the filter membrane 22; at least part of the surface of the cover bottom 4222 extends outward to form a sealing boss 4225, the opening of the sealing boss can not only better compress the air shock gasket 423 on the plate On the body 41, a better sealing effect can be achieved, and a gap can be left between the bottom of the cover 4222 and the plate body 41, so as to ensure that the airflow flushed from the air flushing channel can smoothly lift up the cleaning parts, and the cleaning parts 34 cannot pass through the gap; the air flushing filter rod 421 top (that is, the side close to the air flushing head cover 422) has an air vent 4211, and dirt is not easy to enter; the air flushing filter pocket 425 has provided a plurality of dirt filter holes 4251, which allows air and water to pass through the dirt filter holes but dirt cannot.

Specifically, the mud discharge filter head 43 includes a mud discharge filter rod 431, a mud discharge head cover 432, a mud discharge sealing gasket 433 and a mud discharge fastener 434; the mud discharge filter rod 431 is opened in a hollow cylindrical structure, and the mud discharge filter rod 431 is connected with the mud discharge hood 432, and the two are integrally formed and processed, the mud discharge filter rod can pass through the installation hole 411 on the plate body 41, and the mud discharge hood cannot pass through the installation hole; One end of the rod close to the mud discharge hood is provided with an external thread, and the mud discharge fastener 434 is a regular hexagon, and a through hole for the mud discharge filter rod to pass is provided on it, and an internal thread is provided on the inner wall of the through hole. Thereby, the mud discharge fastener and the mud discharge filter rod can form a threaded connection; during installation, the mud discharge sealing gasket 433 is sleeved on the mud discharge filter rod, and then the mud discharge filter rod is inserted into the installation hole 411, and then the discharge A mud discharge sealing gasket is socketed on the mud filter rod, and finally the mud discharge fastener and the mud discharge filter rod are screwed together to complete the installation and fixation of the mud discharge filter head. There is also a tight fit between them, so that neither gas nor water can pass through the installation hole where the mud discharge filter head is installed.

Further, the length of the mud discharge filter rod 431 is greater than the length of the air flushing filter rod 421; a plurality of mud discharge ports 4321 are provided on the mud discharge head cover 432, and the diameter of the mud discharge port is relatively large, so that the dirt can pass through the discharge port more easily. The mud outlet enters in the mud discharge hood, and then is discharged into the mud collection area 12 through the mud discharge filter rod connected with the mud discharge hood; simultaneously, the diameter of the mud discharge port is smaller than the diameter of the cleaning part 34, so that the cleaning part will not Enter in the mud discharge hood through the mud discharge port; preferably, a mud discharge slope 4322 is also provided on the mud discharge hood 432, and the bottom surface of the mud discharge hood is in contact with the upper surface of the plate body 41, so that the dirt can Enter the mud discharge port along the mud discharge slope, and the dirt is easier to discharge.

Specifically, the operation steps and principle of the air source assembly: when backwashing is required, the air supply part 35 is activated, and the air supply part will transport air into the mud collection area 12 through the air intake pipe 36. Since the plate body 41 and the filter The pool is sealed and fit, and the air will be attached to the lower surface of the plate body 41 under the action of buoyancy. As the air continues to be transported into the mud collection area, an air cushion layer 40 will be formed under the plate body 41, and the mud will collect. The water in the area is pressed into the filter area 11 by the air flushing filter head 42 and the mud discharge filter head 43, while the air cushion layer 40 in the mud collecting area is getting thicker and thicker, and the pressure is getting higher and higher (according to the area and depth of the filter tank) Depending on the situation, the impact force of the high-pressure airflow required is also different. According to the needs of the actual situation, the thickness of the air cushion layer 40 can be changed by installing air flushing filter rods of different lengths, so as to meet the different air pressure requirements in different situations. , the air flushing filter rod can be set to a retractable form, and the adaptability is better); since the length of the mud discharge filter rod 431 is greater than the length of the air flushing filter rod 421, so as the thickness of the air cushion layer 40 becomes thicker and thicker, The thickness of the air cushion layer 40 will be greater than the length of the air flushing filter rod 421 first, at this time the air will be pressed into the air flushing filter rod under the action of pressure, and then enter the air flushing head cover 422 connected with the air flushing filter rod Then, it is ejected from the air blast gap 4223 and the air blast channel 4224 on the air punch head cover. The strong impact force makes the cleaning parts 34 laid on the plate body 41 be washed up, and three-dimensional cleaning is carried out in the filter area 11. (Three-dimensional means that the movement track of the cleaning parts is three-dimensional), disorderly tumbling movement, friction cleaning the surface of the filter membrane 22, rubbing off all the dirt attached to the surface of the filter membrane; at the same time, the gas will also carry water together Impact on the filter membrane to further clean the filter membrane, that is, the three-dimensional mixed multiple cleaning of air washing + water washing + scrubbing is carried out on the filter membrane at the same time, and the cleaning effect is better; at the same time, because the gas carries water and cleaning parts together Flushing on the filter membrane, the gas and water can act as an air cushion and a water cushion, so that the cleaning parts can rub off the dirt on the filter membrane without damaging the filter membrane.

Wherein, because the caliber of the mud discharge port 4321 is relatively large, some of the dirt washed by scrubbing will directly fall into the mud discharge port and be discharged into the mud collection area 12, and the sewage discharge effect is better; Because the vent hole 4211 has a smaller aperture, only a small part of the air will enter the air flushing filter head 42 through the vent hole, which will not affect the formation of the air cushion layer 40. At the same time, in the process of forming the air cushion layer 40, due to A small part of the air enters the air flushing filter rod 421 through the exhaust hole, and then is discharged into the filter area 11 from the air flushing head cover, which can play a pre-loosening effect on the filter material layer formed by the cleaning parts 34, so that the air can flow from When there is a large amount of gushing out of the air flushing head cover, it is easier to flush the cleaning parts to form a three-dimensional mixed flushing; the installation of the air flushing filter pocket 425 enables the air and water in the mud collection area 12 to pass through the air flushing filter. The dirt filter hole 4251 on the pocket enters in the air flushing filter rod 421, while the dirt cannot pass through the dirt filter hole and is left in the mud collection area.

After finishing the backwash, close the air supply part 35, and the air supply part will stop delivering air to the mud collection area 12. At this moment, there is no longer a large amount of air gushing out from the air flushing filter head 42, and the cleaning in the filter area The power of piece 34 is greatly reduced due to the large amount of air no longer pouring in, and the cleaning piece and dirt will slowly settle down without violent tumbling, and part of it will directly enter the mud discharge filter head through the mud discharge port 4321, and then be discharged into the mud collection area 12; at this time, under the action of the water pressure in the filter area 11, the sewage will enter the mud collection area through the mud discharge filter head, and the dirt will be brought into the mud collection area together. A vortex will be formed at the mud head cover 432, so that the dirt in the filter area is more easily sucked into the mud collection area, which facilitates the collection and unified treatment of the dirt; The air will be pressed into the air flushing filter rod 421 through the exhaust hole 4211, and then discharged into the filter area 11 through the air flushing head cover 422, so that the air in the air cushion layer 40 is slowly emptied; The air enters the air flushing filter rod through the exhaust hole 4211 on the air flushing filter rod 421, and then is discharged into the filter area 11 through the air flushing head cover 422, so this small air flow will not disturb the sewage in the filter area, Instead, a small upward driving force will be formed in the filter area, which cooperates with the downward suction at the mud discharge head cover 432, so that the sewage in the filter area can form a circulating flow of water, which is blown from the air. The hood flows upwards, and then flows downwards from the top of the mud discharge hood. The circulating water flow enables the dirt in the upper layer of the sewage to sink and approach the mud discharge hood under the drive of the circulating water flow, and then is discharged from the mud discharge head. The hood is sucked into the mud collection area and collected to play a better role in sewage discharge; multiple air flushing filter heads 42 and multiple mud discharge filter heads 43 are installed alternately in sequence to make the effect of circulating water flow better, and it is easier to filter The dirt in the area is discharged into the mud collection area; and because the aperture of the vent hole 4211 is relatively small, the discharge of air in the air cushion 40 is relatively slow, so that the speed at which the sewage enters the mud collection area 12 by the mud discharge filter head 43 is also low. It is relatively slow, and then the dirt in the filter area 11 has enough time to settle down, and it is easier to be sucked into the mud collection area by the mud discharge filter head, and the sewage discharge effect is better; After the dirt in the area gathers in the sludge discharge tank 13, open the sludge discharge valve 15, and the dirt will be discharged along the sludge discharge pipe 14 under the action of water pressure, without additional installation of a sludge discharge pump, which reduces the equipment cost.

Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Claims (10)

1. the utility model provides a membrane method sewage treatment system which characterized in that: comprises that

A filter tank (1);

The filtering device comprises a membrane frame (21) arranged in the filter tank (1), a filtering membrane (22) arranged on the membrane frame (21), a water collecting pipe (23) communicated with the filtering membrane (22) and a suction piece (24) communicated with the water collecting pipe (23);

The filter material layer (39) is arranged in the filter tank (1), a plurality of cleaning pieces (34) are arranged in the filter material layer, the cleaning pieces (34) can impact the filter membrane (22) in a non-sequential rolling manner under the action of air flow and/or water flow, and then the filter membrane (22) is cleaned.

2. the membrane-process wastewater treatment system according to claim 1, characterized in that: also comprises an air source assembly used for conveying air into the filter tank (1).

3. the membrane-method sewage treatment system according to claim 1 or 2, characterized in that: the water flushing device also comprises a flushing assembly used for enabling the filtering membrane (22) to go out of water from inside to outside.

4. the membrane-process wastewater treatment system according to claim 3, characterized in that: the flushing component comprises a water inlet pipe (32) communicated with the water collecting pipe (23) and a water supply part (31) communicated with the water inlet pipe (32).

5. The membrane-process wastewater treatment system according to claim 4, characterized in that: the filter tank (1) comprises a filtering area (11), a sludge collecting area (12) and an interlayer (38) arranged between the filtering area (11) and the sludge collecting area (12), wherein a filter material layer (39) and a filter membrane (22) are arranged in the filtering area (11).

6. The membrane-process wastewater treatment system according to claim 5, characterized in that: the gas source assembly comprises a gas outlet pipe (37) arranged in the sludge collecting area (12), a gas inlet pipe (36) with one end communicated with the gas outlet pipe (37) and a gas supply piece (35) communicated with the other end of the gas inlet pipe (36).

7. The membrane-process wastewater treatment system according to claim 6, characterized in that: a plate hole (381) is formed in the interlayer (38); and the air outlet pipe (37) is provided with an air outlet hole (371) corresponding to the plate hole (381).

8. The membrane-process wastewater treatment system according to claim 7, characterized in that: one end of the air inlet pipe (36) close to the air supply piece (35) is higher than the side wall of the filter chamber (1).

9. The membrane-process wastewater treatment system according to claim 8, characterized in that: a mud collecting surface (121) is arranged in the mud collecting area (12), and the mud collecting surface is an inclined surface.

10. The membrane-process wastewater treatment system according to claim 9, characterized in that: the cleaning pieces (34) are arranged in a granular structure.