CN114272759A - Upper drainage immersed membrane device and flushing control method thereof - Google Patents

Upper drainage immersed membrane device and flushing control method thereof Download PDF

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Publication number
CN114272759A
CN114272759A CN202111417381.XA CN202111417381A CN114272759A CN 114272759 A CN114272759 A CN 114272759A CN 202111417381 A CN202111417381 A CN 202111417381A CN 114272759 A CN114272759 A CN 114272759A
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China
Prior art keywords
water
unit
membrane
water inlet
device body
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CN202111417381.XA
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邬亦俊
郑志民
吴国荣
芮旻
叶宇兵
吕淼
熊长学
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Priority to CN202111417381.XA priority Critical patent/CN114272759A/en
Publication of CN114272759A publication Critical patent/CN114272759A/en
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Abstract

The invention discloses an upper drainage immersed membrane device and a flushing control method thereof, wherein the device comprises a device body, a water inlet pipe, a water outlet pipe and a water outlet pipe, wherein a sealing space is arranged in the device body, and an exhaust hole is formed in the top of the device body; at least one membrane box fixed in the device body, wherein a membrane component is arranged in the membrane box; the water inlet unit is arranged below the membrane box; the water production unit is arranged above the membrane box; the aeration unit is arranged below the membrane box; a backwashing unit; an upper row unit arranged above the membrane box; and the lower row unit is arranged below the membrane box. The lower water inlet and the upper water outlet can realize the water production operation and the intermittent air-water sequential flushing, and realize the flushing and the upper water outlet without stopping flushing so as to reduce the concentration of suspended matters in the operation and reduce the flushing frequency; the simplified flushing and draining of the water in the water producing stage can be realized by only discharging the water upwards and not discharging the water or discharging the water downwards and not discharging the water, and the complete air-water flushing, air-water back flushing, discharging the water and discharging the water can be completed again, so that the flushing and draining in the water producing stage can shorten the time for water intake and reduce the water discharge.

Description

Upper drainage immersed membrane device and flushing control method thereof
Technical Field
The invention relates to the technical field of water treatment membrane filtration, in particular to an upper drainage immersed membrane device and a flushing control method thereof.
Background
The immersed ultrafiltration membrane has the advantages of large filling quantity and large water yield of a single pool, and is a widely adopted technology at present. The immersed ultrafiltration membrane is fixed by adopting a membrane box, the membrane box is arranged in the membrane device, the membrane box is immersed during water treatment, and the filtration treatment is carried out through the ultrafiltration membrane. The immersed ultrafiltration membrane washing method in the prior art comprises aeration cleaning and water backwashing, wherein the aeration cleaning principle is that compressed air is introduced from bottom to top to make membrane filaments swing and rub against each other, and pollutants attached to the walls of the membrane filaments are peeled off and fall off; the principle of water backwashing is that membrane filaments are washed by backwashing water, and the washed sewage is discharged by a drain pipe at the bottom.
The prior art flushing methods suffer from the following problems:
1. the sludge removed by aeration cleaning is suspended in the tank and can not be discharged outside, and can only be taken out when water is discharged under back flushing, so that the sludge is easy to deposit at the bottom of the tank and is easy to generate siltation at the root of the membrane wire, the lower water discharge is larger, and the time for adding water into the discharged water is longer;
2. the washing of the ultrafiltration membrane must be carried out in a shutdown state, so that the overall treatment efficiency is influenced;
3. the top of the traditional ultrafiltration membrane device is not covered with a cover or a top cover is not pressurized, transmembrane pressure difference is small, and membrane flux is influenced.
Therefore, it is necessary to develop a new submerged membrane device.
Disclosure of Invention
The invention aims to provide an upper drainage immersed membrane device and a flushing control method thereof, which solve the technical problems that sludge removed by aeration cleaning in the prior art is suspended in a tank and cannot be discharged outside, and the sludge can be taken out only when water is discharged under back flushing, so that the sludge is easy to deposit at the bottom of the tank and is easy to deposit at the root of a membrane wire, the lower drainage amount is large, and the time for adding water into the drainage tank is long.
In order to achieve the above object, a first aspect of the present invention discloses an upper drainage submerged membrane apparatus, comprising:
an upper drainage submerged membrane apparatus comprising:
the device comprises a device body, a sealing space is arranged in the device body, and an exhaust hole is formed in the top of the device body;
the membrane boxes are uniformly arranged and fixed in the device body, and a plurality of membrane assemblies are uniformly arranged in the membrane boxes;
the water inlet unit is arranged below the membrane box and used for feeding liquid into the device body;
the water production unit is arranged above the membrane box and used for collecting filtrate of the membrane module;
the aeration unit is arranged below the membrane box and is used for aerating and washing the membrane component;
the backwashing unit is used for introducing backwashing liquid to the top end of the membrane component for backwashing;
the upper discharging unit is arranged above the membrane box and used for discharging waste liquid in an upper manner;
and the lower discharge unit is arranged below the membrane box and is used for discharging waste liquid.
On the basis of the technical scheme, the invention can be further improved as follows:
furthermore, the water inlet unit comprises a plurality of water inlet pipes which extend transversely and are uniformly arranged below the membrane box, the water inlet pipes penetrate out of the device body, and water inlet holes are uniformly formed in the water inlet pipes; the lower row of units comprises a plurality of sludge discharge pipes which are transversely and uniformly arranged below the water inlet pipe in an extending mode, sludge discharge holes are uniformly formed in the sludge discharge pipes, and the sludge discharge pipes and the water inlet pipe are sequentially arranged in a staggered mode.
By adopting the scheme, the water inlet holes are uniformly distributed on the water inlet pipe, so that the bottom surface of the membrane component is ensured to uniformly feed water, and the water flow uniformly rises when the air and the water are simultaneously flushed.
Furthermore, the water inlet unit and the lower row of units are integrally designed, the water inlet unit and the lower row of units comprise a plurality of water inlet mud pipes which transversely extend and are uniformly arranged below the membrane box, through holes are uniformly formed in the water inlet mud pipes, and one ends of the through-hole water inlet mud pipes penetrate out of the device body and are connected with the water inlet header pipe and the outer row header pipe through the water inlet valve and the mud valve respectively.
Through adopting above-mentioned scheme, can play supplementary washing unit body bottom and mud pipe effect when integrated design is intake, avoid the long-pending mud of pipeline, reduce the long-pending mud of bottom of the pool.
Furthermore, it fixes to produce the water unit including a plurality of the product moisture pipe at membrane case top, produce the moisture pipe with membrane case one-to-one, and produce moisture pipe one end and be connected to the membrane module top in order to collect filtrating, the other end converges to producing the water house steward, produce the water house steward setting and be in the internal device body of wearing out of device or set up outside the device body.
Furthermore, the backwashing unit comprises a backwashing pump connected with the water production main pipe through a valve.
Furthermore, the upper drainage groove comprises a plurality of upper drainage grooves which are uniformly arranged at intervals, the upper drainage grooves are fixed above the membrane box, one end of each upper drainage groove is sealed, the other end of each upper drainage groove is provided with an opening, the positions of the device body corresponding to the opening ends of the upper drainage grooves are provided with openings with the same cross sections as the upper drainage grooves, the inner sides of the openings are detachably provided with connecting pieces, the upper drainage grooves are connected with the openings through the connecting pieces, and the device body is externally provided with an upper drainage pipe in sealing connection with the openings.
Furthermore, the top of the device body is provided with an opening, and the opening is provided with a pressurizing cover.
By adopting the above scheme, can increase inflow to the water level and reach device body top to continue to increase the inflow, make the internal area of device take pressure, increase the pressure differential that permeates through the membrane two sides, thereby improve membrane flux and reduce the membrane quantity, and adapt to the pressure differential change that water yield, temperature, membrane silk are new and old etc. cause.
The invention discloses a second aspect of the flushing control method of the upper drainage immersed membrane device, which comprises the steps of water production stage intermittent flushing and shutdown stage flushing, wherein the water production stage intermittent flushing comprises the following steps:
s11, closing the lower row unit and the upper row unit, opening the water inlet unit, enabling water to enter from the lower part of the membrane box, opening the water production unit when the water level exceeds the top of the membrane box, enabling the water to permeate the membrane layer under the action of pressure difference and to be collected and discharged by the water production unit, intercepting pollutants in the water by the membrane assembly, continuously increasing the water inlet amount until the water level reaches the top of the device body, then continuously increasing the water inlet amount, enabling the device body to operate under pressure, increasing the water level difference and increasing the water yield;
s12, reducing water inflow, keeping the water production unit open, opening the upper discharge unit, lowering the water level to the upper discharge unit, and forming cross-flow filtration when the water inflow is greater than the water outflow;
s13, continuously reducing the water inflow, closing the water production unit, opening the aeration unit, forming air-water co-directional forward flushing under the action of the aeration unit and the water inlet unit, and carrying residual pollutants in the membrane module to be discharged from the upper discharging unit to realize flushing and upper discharging of the membrane module;
s14, opening the water producing unit, closing the upper discharging unit, increasing the water inflow to the water level, controlling the water level to be above the membrane box to produce water under normal pressure, or increasing the water inflow to the water level, controlling the water level to be above the top of the device body to produce water under pressure;
the shutdown phase flushing comprises the following steps:
s21 single gas flush: closing the water inlet unit, the water production unit and the lower row unit, opening the upper row unit, lowering the water level in the device to the height of the top of the upper row unit, opening the aeration unit, allowing compressed air to enter the lower part of the membrane component through the aeration unit, enabling the membrane filaments to swing and rub against each other along with the rising of bubbles, and peeling off and falling off pollutants attached to the walls of the membrane filaments;
s22 air-water flushing: starting the water inlet unit to feed water at a small flow rate, and enabling the water inlet unit and the air cushion to cooperate with entrained pollutants to be discharged upwards from the upper discharging unit;
s23 gas-water backflushing: closing the water inlet unit, opening the back washing unit, performing air-water back washing, and keeping the water discharged from the upper discharging unit;
s23 single water back flush: opening the lower row unit, closing the aeration unit, closing the upper row unit, and discharging the backwashing water carrying pollutants from the lower row unit;
s24 emptying: and closing the backwashing unit, keeping the lower row of units open until the water level in the device body is emptied, closing the lower row of units, opening the water inlet unit and the water producing unit, and recovering water production.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the upper discharging unit is arranged above the membrane box, and the water inlet unit is arranged below the membrane box, so that air and water can be flushed and discharged with pollutants upwards, suspended matters among membrane wires and membrane surface flushed and removed matters float upwards along with air flushing and are discharged from the upper part under the driving of water flow, the sludge discharge is cleaner, and the sedimentation of the root parts of the lower ends of the membrane wires and the sedimentation of the bottom of a tank can be reduced; the bottom still keeps a mud discharging measure, and easily settled particles can still be discharged downwards;
2. in the shutdown stage, the membrane assembly is flushed by single gas firstly, so that membrane wires swing to rub against each other, pollutants attached to the walls of the membrane wires are peeled off and fall off, then water enters at a small flow rate, and the small flow rate water can be discharged together with compressed air to carry the pollutants upwards and is discharged through the upper discharging unit; then the backwashing pump is started, the compressed air and the backwashing water further clean the opposite membrane component, the upper-row unit is still kept opened and continuously arranged, and the backwashing sludge remains below the membrane component; then, the compressed air is closed, the lower row unit is opened, bottom pollutants are flushed out and discharged by the lower row unit, finally the back flushing unit is closed, the water level is controlled to the operating water level through the lower row unit, the lower row unit is closed, water production is recovered, the cleanliness of the membrane assembly is effectively guaranteed, and the technical problems that in a traditional flushing mode, only the lower row is back flushed, sludge discharging is not clean and thorough, sludge at the root of membrane filaments is easy to deposit, and long time and much water are consumed for lower water discharging are solved;
3. the lower water inlet and the upper water outlet can realize the water production operation and the intermittent air-water sequential flushing, and realize the flushing and the upper water outlet without stopping flushing so as to reduce the concentration of suspended matters in the operation and reduce the flushing frequency;
4. the invention can realize that the simplified flushing drainage of only upper drainage and no lower drainage or lower drainage but no drainage is carried out for a plurality of times in the water production stage, and the complete shutdown flushing drainage of air-water forward flushing, air-water back flushing upper drainage, lower drainage and drainage is carried out again, the flushing drainage in the water production stage can lead the drainage water intake time to be shorter and the drainage quantity to be smaller;
5. the top of the device body is provided with the pressurizing cover, after the pressurizing cover is used for bearing pressure, the pressurizing mode of the system can be changed, water is fed under pressure in front of the membrane or directly produced by utilizing a front rich water head, the device can be superposed with the prior art, and the pressure control unit is still arranged behind the membrane, so that the advantages of strong immersed sewage interception capability and large water production of a single tank are maintained, the transmembrane pressure difference is improved, the membrane flux is improved, the membrane consumption is reduced, and the size of the device body is reduced;
6. the device body of the invention can be suitable for membrane devices without covers, the operation water level is higher than the membrane tank but not higher than the top of the membrane device, and the water production main pipe can be provided with a pump for sucking so as to increase the water yield.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of an upper drainage submerged membrane device according to an embodiment of the present invention.
Fig. 2 is a side view schematic of the structure of fig. 1.
Shown in the figure:
1. a device body; 101. an exhaust hole; 102. pressing a cover;
2. a membrane box; 201. a membrane module;
3. perforating a water inlet and sludge discharge pipe; 301. a water inlet valve; 302. a mud valve;
4. producing a water pipe;
5. an upper drainage tank;
6. a drainage channel wall pipe;
7. an aerator;
8. a connecting member.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
As shown in fig. 1 and fig. 2, the upper drainage immersed membrane device provided by this embodiment includes a device body 1, a sealed space is provided inside the device body 1, and a vent hole 101 is provided at the top.
Four membrane boxes 2 are uniformly arranged and fixed in the device body 1, and membrane assemblies 201 which are tightly arranged are arranged in the membrane boxes 2.
A water inlet unit for feeding liquid into the device body 1 and a lower discharge unit for discharging waste liquid are arranged below the membrane box 2. Specifically, the integrated design of the water inlet unit and the lower unit in the embodiment comprises five water inlet and sludge discharge pipes 3 which are transversely extended and uniformly arranged below the membrane box 2, wherein the water inlet and sludge discharge pipes 3 are arranged between the sludge collecting slope grooves at equal intervals. The water inlet and sludge discharge pipe 3 is evenly provided with through holes. The water inlet mud pipe 3 extends along the length direction of the device body 1 to cover the whole range of the device body, and one end of the water inlet mud pipe 3 penetrates out of the device body 1 and then is connected with the water inlet header pipe and the outer discharge header pipe through the water inlet valve 301 and the mud valve 302 respectively. The integrated design can play the roles of assisting the bottom of the flushing device body 1 and the sludge discharge pipe when water enters, thereby avoiding the sludge accumulation of the pipeline and reducing the sludge accumulation at the bottom of the pool.
Except the mode that the integration set up, the unit also can adopt independent inlet tube and mud pipe under the unit with intaking, also can realize normal intaking and arrange the operation down.
A water production unit for collecting filtrate and an upper discharge unit for discharging waste liquid are arranged above the membrane box 2. Specifically, produce the water unit and include four and fix the product moisture pipe 4 at membrane case 2 top, produce moisture pipe 4 and membrane case 2 one-to-one, and produce moisture pipe 4 one end and be connected to membrane module 201 top in order to collect filtrating, the other end is worn out the device body 1 and is converged to producing water house steward, produces moisture pipe 4 and establishes the loose joint connection in the wall department.
The upper row unit comprises four upper water drainage grooves 5 which are uniformly arranged at intervals, and the four upper water drainage grooves 5 are arranged in one-to-one correspondence with the four membrane boxes 2. Last water drainage tank 5 is fixed in membrane case 2 top, and 5 one ends of last water drainage tank seal, and the other end opening sets up, and the device body 1 corresponds the position with the open end of last water drainage tank 5 and is equipped with the trompil the same with 5 sections of last water drainage tank, and the inboard demountable installation of trompil has connecting piece 8, and last water drainage tank 5 passes through connecting piece 8 and trompil intercommunication. The device body 1 is externally provided with a drainage channel wall-penetrating pipe 6 connected with the opening.
And an aeration unit is also arranged below the membrane box 2, and the aeration unit is four aerators 7 which correspond to the four membrane boxes 22 one by one.
In order to realize the back flushing of the membrane module 201, the present embodiment is further provided with a back flushing unit (not shown in the figure). The back washing unit comprises a back washing pump connected with the water production main pipe through a valve.
The top opening of the device body 1 of the embodiment is arranged, the pressurizing cover 102 is arranged at the opening, the water inflow can be increased to reach the top of the device body 1 through the water level, the water inflow is continuously increased, the pressure in the device body 1 is increased, the pressure difference of two surfaces of the permeable membrane is increased, the membrane flux is improved, the membrane using amount is reduced, and the device is adaptive to the pressure difference change caused by water amount, temperature, new and old membrane threads and the like.
Meanwhile, the embodiment can also adopt a suction pump and the like to be connected with the water producing unit to improve the required pressure difference, thereby realizing the water production with the water level higher than the membrane tank 2 and in the state of not filling the device body 1.
The flushing control method of the immersed membrane device comprises the steps of water production stage intermittent flushing and shutdown stage flushing, wherein the water production stage intermittent flushing comprises the following steps:
s11, closing the lower discharging unit and the upper discharging unit, starting the water inlet unit, enabling water to enter from the lower part of the membrane box 2, starting the water producing unit when the water level exceeds the top of the membrane box 2, enabling the water to permeate the membrane layer under the action of pressure difference and to be collected and discharged by the water producing unit, intercepting pollutants in the water by the membrane component 201, continuously increasing the water inlet amount until the water level reaches the top of the device body 1, then continuously increasing the water inlet amount, enabling the device body 1 to operate under pressure, increasing the water level difference and increasing the water yield;
s12, reducing water inflow, keeping the water production unit open, opening the upper discharge unit, lowering the water level to the upper discharge unit, and forming cross-flow filtration when the water inflow is greater than the water outflow;
s13, continuously reducing the water inflow, closing the water production unit, opening the aeration unit, forming air-water co-directional forward flushing under the action of the aeration unit and the water inlet unit, and discharging residual pollutants in the entrained membrane module 201 from the upper discharging unit to realize flushing and upper discharging of the membrane module 201;
s14, the water producing unit is started, the upper discharging unit is closed, the water inflow is increased to the water level, the water is controlled above the membrane box 2 to produce water under normal pressure, or the water inflow is increased to the water level, the water level is controlled above the top of the device body 1 to produce water under pressure.
Step S13 may be executed according to the quality of the inlet water, and may be executed at intervals or not when the quality of the inlet water is good.
The shutdown stage flushing comprises the following steps:
s21 single gas flush: closing the water inlet unit, the water production unit and the lower row unit, opening the upper row unit, lowering the water level in the device body 1 to the height of the top of the upper row unit, opening the aeration unit, allowing compressed air to enter the lower part of the membrane component 201 through the aeration unit, enabling the membrane filaments to swing and rub against each other along with the rising of bubbles, and peeling off pollutants attached to the walls of the membrane filaments;
s22 air-water flushing: starting the water inlet unit to feed water at a small flow rate, and enabling the small flow rate water inlet and the air blast to be matched with entrained pollutants to be discharged upwards from the upper discharging unit;
s23 gas-water backflushing: closing the water inlet unit, starting the back washing unit, performing air-water back washing, and keeping the water discharged from the upper discharging unit;
s23 single water back flush: opening the lower row unit, closing the aeration unit, closing the upper row unit, and discharging the backwashing water carrying pollutants from the lower row unit;
s24 emptying: and (3) closing the backwashing unit, keeping the lower row of units open until the water level in the device body 1 is emptied, closing the lower row of units, and opening the water inlet unit and the water production unit to recover water production.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (8)

1. An upper drainage immersed membrane device, comprising:
the device body is internally provided with a sealed space, and the top of the device body is provided with an exhaust hole;
the membrane boxes are uniformly arranged and fixed in the device body, and a plurality of membrane assemblies are uniformly arranged in the membrane boxes;
the water inlet unit is arranged below the membrane box and used for feeding liquid into the device body;
the water production unit is arranged above the membrane box and used for collecting filtrate of the membrane module;
the aeration unit is arranged below the membrane box and is used for aerating and washing the membrane component;
the backwashing unit is used for introducing backwashing liquid to the top end of the membrane component for backwashing;
the upper discharging unit is arranged above the membrane box and used for discharging waste liquid in an upper manner;
and the lower discharge unit is arranged below the membrane box and is used for discharging waste liquid.
2. The upper drainage immersed membrane device according to claim 1, wherein the water inlet unit comprises a plurality of water inlet pipes which extend transversely and are uniformly arranged below the membrane box, the water inlet pipes penetrate through the device body, and water inlet holes are uniformly formed in the water inlet pipes; the lower row of units comprises a plurality of sludge discharge pipes which are transversely and uniformly arranged below the water inlet pipe in an extending mode, sludge discharge holes are uniformly formed in the sludge discharge pipes, and the sludge discharge pipes and the water inlet pipe are sequentially arranged in a staggered mode.
3. The upper drainage immersed membrane device according to claim 1, wherein the water inlet unit and the lower discharge unit are integrally designed, the water inlet unit and the lower discharge unit comprise a plurality of water inlet and sludge discharge pipes which extend transversely and are uniformly arranged below the membrane box, the water inlet and sludge discharge pipes are uniformly provided with through holes, and one end of each through hole water inlet and sludge discharge pipe penetrates out of the device body and is connected with the water inlet header pipe and the outer discharge header pipe through a water inlet valve and a sludge discharge valve respectively.
4. The upper drainage immersed membrane device according to claim 1, wherein the water production unit comprises a plurality of water production branch pipes fixed on the top of the membrane box, the water production branch pipes correspond to the membrane box one by one, one end of each water production branch pipe is connected to the top end of the membrane component to collect filtrate, the other end of each water production branch pipe is converged to a water production main pipe, and the water production main pipe is arranged in the device body and penetrates out of the device body or is arranged outside the device body.
5. The upper drain submerged membrane apparatus of claim 4, wherein the backwash unit comprises a backwash pump connected to the water production main through a valve.
6. The upper drainage immersed membrane device according to claim 1, wherein the upper drainage unit comprises a plurality of upper drainage channels which are uniformly spaced, the upper drainage channels are fixed above the membrane box, one end of each upper drainage channel is sealed, the other end of each upper drainage channel is opened, an opening with the same section as that of each upper drainage channel is arranged at a position of the device body corresponding to the opening end of each upper drainage channel, a connecting piece is detachably mounted on the inner side of each opening, each upper drainage channel is connected with the corresponding opening through the corresponding connecting piece, and an upper drainage pipe which is connected with the corresponding opening in a sealing manner is arranged outside the device body.
7. The upper drainage submerged membrane device according to claim 1, wherein the top of the device body is provided with an opening, and the opening is provided with a pressurizing cover.
8. A method for controlling flushing of an upper drainage immersed membrane device according to any one of claims 1 to 7, comprising an intermittent flushing in a water production phase and a flushing in a shutdown phase, wherein the intermittent flushing in the water production phase comprises the following steps:
s11, closing the lower row unit and the upper row unit, opening the water inlet unit, enabling water to enter from the lower part of the membrane box, opening the water production unit when the water level exceeds the top of the membrane box, enabling the water to permeate the membrane layer under the action of pressure difference and to be collected and discharged by the water production unit, intercepting pollutants in the water by the membrane assembly, continuously increasing the water inlet amount until the water level reaches the top of the device body, then continuously increasing the water inlet amount, enabling the device body to operate under pressure, increasing the water level difference and increasing the water yield;
s12, reducing water inflow, keeping the water production unit open, opening the upper discharge unit, lowering the water level to the upper discharge unit, and forming cross-flow filtration when the water inflow is greater than the water outflow;
s13, continuously reducing the water inflow, closing the water production unit, opening the aeration unit, forming air-water co-directional forward flushing under the action of the aeration unit and the water inlet unit, and carrying residual pollutants in the membrane module to be discharged from the upper discharging unit to realize flushing and upper discharging of the membrane module;
s14, opening the water producing unit, closing the upper discharging unit, increasing the water inflow to the water level, controlling the water level to be above the membrane box to produce water under normal pressure, or increasing the water inflow to the water level, controlling the water level to be above the top of the device body to produce water under pressure;
the shutdown phase flushing comprises the following steps:
s21 single gas flush: closing the water inlet unit, the water production unit and the lower row unit, opening the upper row unit, lowering the water level in the device to the height of the top of the upper row unit, opening the aeration unit, allowing compressed air to enter the lower part of the membrane component through the aeration unit, enabling the membrane filaments to swing and rub against each other along with the rising of bubbles, and peeling off and falling off pollutants attached to the walls of the membrane filaments;
s22 air-water flushing: starting the water inlet unit to feed water at a small flow rate, and enabling the water inlet unit and the air cushion to cooperate with entrained pollutants to be discharged upwards from the upper discharging unit;
s23 gas-water backflushing: closing the water inlet unit, opening the back washing unit, performing air-water back washing, and keeping the water discharged from the upper discharging unit;
s23 single water back flush: opening the lower row unit, closing the aeration unit, closing the upper row unit, and discharging the backwashing water carrying pollutants from the lower row unit;
s24 emptying: and closing the backwashing unit, keeping the lower row of units open until the water level in the device body is emptied, closing the lower row of units, opening the water inlet unit and the water producing unit, and recovering water production.
CN202111417381.XA 2021-11-25 2021-11-25 Upper drainage immersed membrane device and flushing control method thereof Pending CN114272759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111417381.XA CN114272759A (en) 2021-11-25 2021-11-25 Upper drainage immersed membrane device and flushing control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111417381.XA CN114272759A (en) 2021-11-25 2021-11-25 Upper drainage immersed membrane device and flushing control method thereof

Publications (1)

Publication Number Publication Date
CN114272759A true CN114272759A (en) 2022-04-05

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ID=80869941

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Application Number Title Priority Date Filing Date
CN202111417381.XA Pending CN114272759A (en) 2021-11-25 2021-11-25 Upper drainage immersed membrane device and flushing control method thereof

Country Status (1)

Country Link
CN (1) CN114272759A (en)

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