KR20120027492A - Filtration membrane module cleaning method and cleaning device - Google Patents

Abstract

[Problem] In the conventional on-air cleaning method and washing apparatus, the filtration membrane module must be pulled out of the reaction tank to inject a chemical solution while the filtration membrane module is exposed to air, thus requiring complicated work, large equipment cost, and installation space.
[Solution] The filtration membrane module 11 is accommodated in the module casing 27, air is introduced into the module casing 27 to fill the air in the module casing 27, and the filtration membrane module 11 is exposed to air. In such a state, a cleaning chemical solution such as sodium hypochlorite solution is injected into the secondary side of the filtration membrane module 11, and the chemical solution penetrates into the primary side of the filtration membrane module 11 to clean the filtration membrane module 11.

Description

Filtration membrane module cleaning method and cleaning device

The present invention relates to a filtration membrane module cleaning method and a cleaning apparatus in which the filthy material contained in household sewage and industrial wastewater is immersed in a reaction tank for biotreatment or flocculation / sedimentation treatment to perform a filtration operation.

In the membrane separation processing system in which the pollutants contained in domestic sewage and industrial wastewater are subjected to biotreatment or flocculation / sedimentation treatment, the membrane module is placed in the reaction tank, and the filtered water membrane is separated by the filtration operation. .

Due to the filtration operation, the removed contaminants adhere to the membrane surface of the filtration membrane module and are likely to deposit on the pores inside the membrane surface of the module. Usually, aeration is formed from the bottom of the filtration membrane module in order to suppress the adhesion and deposition of contaminants on the membrane surface and to increase the filtration operation time, thereby causing bubbles to collide with the membrane surface. The scrubbing air is supplied to the reactor to suppress the adhesion and deposition of substances. In addition, the filtered water, which is pressurized at a certain period, is injected into the filtration membrane module to remove backwash. However, scrubbing air and backwashing method also have a limit in showing long-term good inhibitory effect. For this reason, it is essential to perform chemical liquid cleaning to chemically remove the contaminated substances deposited and deposited from the membrane surface in order to remove the contaminants adhered and deposited on the remaining membrane surface despite scrubbing air and backwash.

As a substance for the chemical liquid, sodium hypochlorite is often used when the attached and deposited contaminant is an organic substance, and oxalic acid is used for the inorganic substance.

In-line cleaning and on-air cleaning are known as a method for cleaning a filtration membrane module using a chemical liquid.

In-line washing is performed by injecting sodium hypochlorite solution into the secondary side of the filtration membrane module (i.e., the outflow side of the filtrate) while the filtration membrane module is immersed in the reaction tank. ) Is a chemical liquid cleaning method of a filtration membrane module that penetrates and permeates (hereinafter referred to as a first cleaning method).

In the on-air cleaning method, when the filtration membrane module is exposed to air, sodium hypochlorite solution is injected into the secondary side of the filtration membrane module, and the chemical solution of the filtration membrane module penetrates and permeates from the secondary side of the filtration membrane module to the primary side. It is a way.

Specifically, the following three methods are known as on-air cleaning methods.

First, the filtration membrane module immersed in the reaction tank is pulled out of the reaction vessel and exposed to the air, and sodium hypochlorite solution is injected into the secondary side of the filtration membrane module, and the chemical solution penetrates and permeates from the secondary side of the filtration membrane module to the primary side. A chemical liquid cleaning method of the module (hereinafter referred to as a second cleaning method).

Second, the solution is discharged from the reaction tank in which the filtration membrane module is immersed, the filtration membrane module is exposed to air, and sodium hypochlorite solution is injected into the secondary side of the filtration membrane module, and the chemical solution penetrates into the primary side of the filtration membrane module. The chemical liquid cleaning method of the permeable filtration membrane module is hereinafter referred to as a third cleaning method.

Thirdly, an immersion tank using an outer tank in which the filtration membrane module is immersed next to the reaction tank. In this method, only the solution in the outer immersion tank is discharged when the pollutant is treated to perform chemical cleaning. Therefore, compared with the third cleaning method, it is possible to reduce the amount of the discharge liquid, and furthermore, after the discharge liquid is temporarily stored in the reaction tank, the filtration membrane module adopts the same chemical liquid cleaning method as the third cleaning method. Possible (hereinafter, referred to as fourth cleaning method). Patent document 1 is one of the documents that disclose the cleaning method.

(Prior art document)

Patent Document 1: Japanese Patent Laid-Open No. 2005-66548

In the first cleaning method (in-line cleaning method), the chemical liquid is injected while the filter membrane module is immersed in the reaction tank, and it is difficult for the chemical liquid to penetrate into the filter membrane module due to the liquid pressure in the reaction tank. Furthermore, the concentration of the chemical liquid penetrated and permeated into the surface of the filter membrane module is diluted by the solution, thereby reducing the cleaning effect of the contaminated material deposited and deposited on the membrane surface of the filter membrane module. In addition, when the blockage of the filtration membrane module occurs, the chemical liquid does not spread in the blocked portion, and a cleaning panel is generated. In order to eliminate the cleaning panel, a high pressure chemical solution must be injected into a large amount of membrane module, and a high pressure pump and a large amount of chemical solution are required.

In the second cleaning method (on-air cleaning method), a lifting device such as a chain block or the like must be used to pull the filtration membrane module out of the reaction tank and move it into the air. In addition, complicated work such as dismantling the pipes for the filtered water and the scrubbing air and installing the pipes after the completion of cleaning is required.

The third cleaning method (on-air cleaning method) requires a separate storage tank to temporarily hold the solution discharged from the reaction tank. In general, the filtration membrane module is immersed in the bottom of the reaction tank having a depth of 4 ~ 5m, in order to expose the entire filtration membrane module to the air, a large-capacity tank for temporarily storing the discharged solution solution, and temporarily storing the discharged solution And the installation of the transfer pump is required, resulting in an increase in construction and operating costs.

In the fourth cleaning method (on-air cleaning method), that is, an immersion tank using method in which an external immersion tank in which the filtration membrane module is immersed next to the reaction tank, only the solution of the external immersion tank needs to be discharged. The amount of discharge can be reduced. Furthermore, when the discharge liquid is transferred to the reaction tank, the external immersion tank may be used as a temporary storage tank. However, due to the need for a transfer pump for transferring the liquid from the external immersion tank and the reaction tank to the external immersion tank, the construction cost and the operation cost are still increased, although not reaching the third cleaning method.

An object of the present invention is to reduce the cleaning ability, which is a drawback of the first cleaning method, to increase the pressure of the chemical injection pump and to use a large amount of the chemical solution, the necessity of a lifting device such as a chain block, which is a drawback of the second cleaning method, and the like. Separate storage tank and transfer pump facility to temporarily store the solution discharged from the reaction tank, which is a drawback of the third cleaning method, such as dismantling the scrubbing air pipe and installing the pipe after the completion of cleaning. Necessity, the need for an external immersion tank and a transfer pump, which is a drawback of the fourth cleaning method, and the ease of in-line cleaning in which the filtration membrane module is chemically washed while the filtration membrane module is immersed in the reaction tank, and the conventional on-air cleaning The present invention provides a filtration membrane module cleaning method and a cleaning apparatus which can obtain a high cleaning effect.

In the filtration membrane module cleaning method of the present invention, the cleaning chemical is injected into the secondary side of the filtration membrane module immersed in the reaction solution, the chemical liquid penetrates and permeates to the primary side of the filtration membrane module, the filtration membrane module module casing (or cleaning) Casing), air is supplied into the module casing, and the chemical liquid is injected into the secondary side of the filtration membrane module while the filtration membrane module is exposed to air so that the chemical liquid penetrates and permeates to the primary side of the module.

The filtration membrane module cleaning apparatus of the present invention includes a chemical liquid injection device for injecting a cleaning chemical liquid into the secondary side of the filtration membrane module immersed in the reaction tank, and the chemical liquid is injected into the secondary side of the filtration membrane module by the chemical liquid injection device to filter the membrane. A module casing which cleans the module but accommodates the filtration membrane module and stores air for exposing the filtration membrane module to air; and an air supply device for supplying air into the module casing to expose the filtration membrane module to air. .

The module casing is formed in a cover cylinder shape in which a bottom part is opened and an upper part is closed by a cover plate, and the cover plate is provided with a liquid / air discharge valve communicating with the inside and outside of the module casing. An air pressure driving valve may be used as the liquid / air release valve.

An air blower or a scrubbing blower may be used as an air supply device for supplying air into the module casing.

In the filtration membrane module cleaning method of the present invention, air is supplied into the module casing containing the filtration membrane module, the air is filled into the module casing, and the chemical liquid is injected into the secondary side of the filtration membrane module in a state where the filtration membrane module is exposed to air. Compared with the conventional inline cleaning method in which the chemical solution is injected while the filter membrane module is immersed in the reaction tank, the permeation and permeation of the chemical solution is easy as the filter membrane module does not receive the hydraulic pressure. The chemical liquid exuded through the pores of the membrane surface of the filtration membrane module and the liquid in the reaction tank do not react to deteriorate the effect of the chemical liquid. Furthermore, since the chemical liquid is not diluted by the solution, it is possible to suppress the deterioration of the cleaning effect due to the dilution of the chemical liquid. The filtration membrane module cleaning method of the present invention can be carried out by adding a simple step of supplying air into the module casing after the filtration membrane module is accommodated in the module casing.

The filtration membrane module cleaning apparatus of the present invention can be implemented in a conventional inline washing apparatus through a simple improvement in which air is supplied by the air supply device into the module casing after the filtration membrane module is accommodated in the module casing. By supplying air to the air supply device in the module casing, the air in the module casing is filled and the filtration membrane module is exposed to the air, and the chemical liquid is injected into the secondary side of the filtration membrane module by the chemical liquid injection device to clean the on air of the filtration membrane module. This is possible.

Since the module casing is formed in a lid cylindrical shape in which the bottom part is open and the top part is closed by the cover plate, air can be supplied into the module casing to the air supply device through the opening of the bottom part. A liquid / air discharge valve is provided on the cover plate of the module casing, and the liquid / air discharge valve can be opened and closed to store or discharge air in the module casing. Therefore, by adding only the liquid / air discharge valve to the conventional inline washing apparatus adjusting system, the adjusting system of the filtration membrane module washing apparatus of the present invention is formed.

When using an air blower or a scrubbing blower as an air supply device for supplying air into the module casing, it is not necessary to use a dedicated air compressor as the air supply device, so that the cost of the cleaning device can be reduced by the cost of the air compressor. Do.

1 is a flow chart of a sewage treatment system using a membrane bioreactor method (MBR) equipped with a filtration membrane module cleaning device of the present invention.
2 is a partially enlarged view of the filtration membrane module cleaning device of the present invention.

(Example)

1 is a flow chart of a sewage treatment system using a membrane bioreactor method (MBR) equipped with a filtration membrane module cleaning device of the present invention. In this sewage treatment system, raw water 1 such as household sewage, industrial wastewater, etc. flows into the screen tank 2 and is sent to the flow regulating tank 4 with the solid content removed by the fine screen 3. . And the raw water from which solid content was removed is sent from the said flow adjusting tank 4 to the denitrification tank 6 by the pump 5 which adjusts flow volume, and flows into the reaction tank 7 by the natural drop by a level difference. By the transfer pump 8, the raw water is conveyed from the reaction tank 7 to the denitrification tank 6, whereby activated sludge is circulated between the denitrification tank 6 and the reaction tank 7 A part of the sludge is taken out from the reaction tank 7 by the sludge discharge valve 9.

In the said denitrification tank 6, stirring is performed by the stirrer 10 in an oxygen free state. In the reactor 7, influent water (hereinafter referred to as filtrate) is biotreated by activated sludge, filtered by the filtration membrane module 11 disposed in the reactor 7, and filtered water (hereinafter, filtration). Water) is fed to the filtrate tank 13 through the filtrate pipe 12 and temporarily stored in the filtrate tank 13, and then discharged from the filtrate tank 13 by the pump 14.

As the filtration membrane module 11, a cylindrical hollow fiber membrane module made of polyvinylidene fluoride (PVDF) or the like is used. The filtration membrane module 11 is filtered through the solution (or water) in the reaction tank (7). One or more filtration membrane modules 11 are provided in the reaction tank 7.

In the reactor 7, an aerobic treatment is carried out in the presence of dissolved oxygen by an aeration blower (aeration blower) 15, and at the same time, the filtration membrane module is carried out by a scrubbing blower 16 and a scrubbing acid machine 17. (11) is constantly vibrated to prevent the filtration membrane module 11 from being blocked by the activated sludge. Reference numeral 15a denotes an aerator for aeration.

A filtration / backwash pump 18 is installed in the middle of the filtered water pipe 12. When the filtration / backwash pump 18 filters the filtered water, when the filtration membrane module 11 is backwashed by supplying filtration water from the filtration water tank 13 to the filtration membrane module 11 at every set time, Alternatively, the filtration membrane module 11 is used by the chemical liquid injection device 26 to be described later to wash the chemical liquid after the chemical liquid is washed.

The filtration water pipe 12 has first and second valves 19 on the upstream side (reaction tank 7 side) and downstream side (filtration tank 13 side) with the filtration / backwash pump 18 interposed therebetween. 20) is connected. Furthermore, a first filtered water flow path 21 connecting the upstream side of the first valve 19 and the filtration / backwash pump 18 and the second valve 20 to the filtered water pipe 12. Is installed. A third valve 22 is installed in the first filtered water flow path 21. Further, a second filtered water flow path 23 connecting the filtered / backwash pump 18 and the first valve 19 and the filtered water tank 13 is installed in the filtered water pipe 12. The fourth valve 24 is installed in the second filtered water flow path 23.

The filtration membrane module 11 is washed by the filtration membrane module cleaning device 25 described below.

As shown in FIG. 1 and FIG. 2, the filtration membrane module cleaning device 25 includes a chemical solution injection device 26 for injecting cleaning chemicals such as sodium hypochlorite solution into the secondary side of the filtration membrane module 11 during module cleaning. ) And a module casing (clean casing) 27 capable of storing air for accommodating the filtration membrane module 11 and exposing the filtration membrane module 11 to air, and supplying air in the module casing 27. Feeder 28.

The air supply device 28 is responsible for the function of the scrubbing blower 16, by placing the scrubbing acid device 17 on the bottom of the module casing 27 to the bottom of the module casing 27 Air is supplied into the module casing 27 through the formed opening.

The chemical liquid injection device 26, the chemical liquid tank 29, the chemical liquid supply pump 30, containing the chemical liquid for cleaning, such as sodium hypochlorite solution, and the chemical liquid of the chemical liquid tank 29 to the filtration membrane module 11 It consists of the chemical liquid supply path 31 to supply, and the 5th valve 32 provided in this chemical liquid supply path 31. As shown in FIG. The chemical liquid supply passage 31 is connected to the filtrate pipe of an upstream side (filtration membrane module 11 side) of the first filtrate backflow passage 21.

The module casing 27 is formed of a material such as an airtight metal which is difficult to be eroded by the chemical liquid.

The module casing 27 is formed in a cylindrical shape larger in diameter than the filtration membrane module 11 and longer than the filtration membrane module 11. The module casing 27 accommodates one or a plurality of the filtration membrane modules 11.

The liquid / air discharge valve 33 is installed above the module casing 27.

The bottom of the module casing 27 is open and the top is closed with a cover plate. When chemical liquid cleaning is required, air is supplied by the air supply device 28 through the opening while the liquid / air discharge valve 33 is closed, and the air is activated so that the module casing is filtered. (27) It gradually accumulates in the module casing 27 while being pushed downward so that air covers the periphery of the filtration membrane module 11 in the module casing 27.

On the other hand, by opening the liquid / air release valve 33, the air in the module casing 27 is discharged so that the activated sludge can penetrate into the module casing 27 and is active in the module casing 27. After the sludge is filled, active sludge circulation is ensured between the inside and the outside of the module casing 27. As the liquid / air discharge valve 33, it is desired to use an air pressure driving valve. When a plurality of the liquid / air discharge valves 33 are installed, the rapidity of air discharge in the module casing 27 and the circulation of active sludge between the inside and outside of the module casing 27 are improved.

The liquid / air release valve 33 does not necessarily need to be installed on the cover plate above the module casing 27. However, the valve 33 may be disposed so that the filtration membrane module 11 is not exposed to the air remaining in the module casing 27.

Next, the operation of the filtration membrane module cleaning device will be described. During filtration, the fifth valve 32 of the chemical liquid injection device 26 is closed, the liquid / air discharge valve 33 is opened, and the first and second valves 19 provided in the filtrate water pipe 12 are opened. 20 is opened and the filtration / backwash pump 18 is driven. For this reason, the filtered water of the said reaction tank 7 is filtered by the said filtration membrane module 11, it is sent to the said filtered water tank 13, and it is temporarily stored.

When the filtration membrane module 11 is cleaned by on air cleaning, the air blower 15 is stopped, the filtration / backwash pump 18 is stopped, and the first and second valves 19 and 20 are closed. The liquid / air release valve 33 is closed. When the scrubbing blower 16 is driven in this state, the air from the scrubbing blower 16 passes through the scrubbing acid machine 17 from the opening of the bottom of the module casing 27 to the module casing 27. ) And accumulate in the module casing 27 while pushing the activated sludge under the module casing 27.

When the air is filled in the module casing 27 and the air is covered around the filtration membrane module 11 in the module casing 27, the scrubbing blower 16 is stopped to stop the air supply.

When the stop time of the scrubbing blower 16 is delayed, the supply air enters a so-called overflow state and leaks from the bottom of the module casing 27 to the outside of the module casing 27. However, even if the air is somewhat leaked in this way, it does not affect the processing performance and other operations. Therefore, it is not necessary to strictly control the air supply stop timing of the scrubbing blower 16, and a simple time setting is sufficient.

When the air in the module casing 27 is filled and the filtration membrane module 11 is exposed to air, the fifth valve 32 is opened, and the chemical liquid supply pump 30 is driven to operate the chemical liquid tank. The chemical liquid of (29) is injected into the filtration membrane module 11 for a predetermined amount and for a predetermined time, and the filtration membrane module 11 is cleaned by the chemical liquid.

When the cleaning by the chemical liquid is finished, the chemical liquid supply pump 30 is stopped, the fifth valve 32 is closed, the first and second valves 19 and 20 are closed, and the third and fourth valves are closed. (22, 24) are opened and the filtration / backwash pump 18 is re-driven. Accordingly, the filtration water of the filtration tank 13 is supplied to the filtration membrane module 11 through the second filtration water backflow passage 23 and the first filtration water backflow passage 21 so that the filtration membrane module 11 is filtered water. The chemical liquid remaining on the membrane surface of the filtration membrane module 11 is washed off, and the cleaning of the filtration membrane module 11 is finished. The process of washing off the chemical liquid may be performed after the activated sludge is filled in the module casing 27.

After the cleaning of the filtration membrane module 11 is finished, the liquid / air discharge valve 33 is opened. As the liquid / air release valve 33 is opened, air in the module casing 27 is discharged to the outside of the module casing 27 through the liquid / air release valve 33 and at the same time the module casing ( The activated sludge penetrates into 27), and the activated sludge is filled in the module casing 27. At the same time, the first and second valves 19 and 20 are opened, and the air blower 15, the filtration / backwash pump 18, and the scrubbing blower 17 are all driven to resume filtration. . The time for the system to return to filtration can be set by the timer setting.

The filtration membrane module cleaning apparatus of the present invention has the above-described configuration and has the following effects.

(1) By a simple method of accommodating the filtration membrane module in the module casing and supplying air, it is possible to perform on-air cleaning in a state where the filtration membrane module is immersed in the reaction tank, so that the activated sludge of the reaction tank is discharged or from the reaction tank. On-air cleaning of the filtration membrane module can be easily performed as compared with the conventional method of performing on-air cleaning after taking out the filtration membrane module.

(2) The filtration membrane modules can be individually on-air cleaned without drawing the filtration membrane modules into the air. In the conventional method, when the on-air cleaning is performed after the activated sludge is discharged from the reaction tank provided with the plurality of filtration membrane modules, the use of all the filtration membrane modules installed in the reaction vessel is stopped, and the processing capacity of the entire system is greatly reduced. However, in the present invention, the on-air cleaning of the individual (per module casing) filtration membrane module is possible, and the use of the remaining filtration membrane modules other than the filtration membrane module to be cleaned can ensure stable filtration and treatment.

(3) Since it is possible to wash the chemical liquid while the filtration membrane module is immersed in the reaction tank, the filtration membrane module cleaning device can be easily combined with the automatic operation of the sewage treatment system. Therefore, the chemical liquid washing frequency can be set high, the blockage of the filtration membrane module is suppressed, and stable processing capacity is ensured.

(4) In the filtration membrane module cleaning apparatus of the present invention, the parts specially added to the apparatus are only the module casing for accommodating the filtration membrane module, the liquid / air discharge valve mounted on the module casing, and the air source for the valve. It is possible to manufacture the device of the present invention at a relatively low cost. In particular, when the scrubbing blower is used as an air supply device for supplying air to the module casing, the number of parts used can be reduced, thereby reducing the cost. Therefore, compared with the conventional on-air cleaning apparatus, it is possible to manufacture an air supply apparatus at low cost. Furthermore, less energy is needed to use the air supply.

In this embodiment, as the air supply device 28, the scrubbing blower 16 and the scrubbing acid device 17 are used, and the scrubbing acid device 17 opens the bottom opening of the module casing 27. It is disposed toward the air supply to the module casing (27). However, it is not necessary to supply air through the bottom opening of the module casing 27. For example, a branch path (not shown) is connected to the air supply path 34 connecting the scrubbing blower 16 and the scrubbing acid machine 17 through a switch valve (not shown), and the branch The front end of the furnace may be connected to the module casing 27 to supply air into the module casing 27. In the case of supplying air, the air supply to the scrubbing acid machine 17 is stopped by the switch valve. A check valve (not shown) is provided at the tip of the branch path. The tip of the branch path is connected to any position of the module casing 27. In addition, air may be supplied into the module casing 27 using the air blower 15 instead of the scrubbing blower 16.

In addition, if necessary, a dedicated air supply blower may be used instead of the scrubbing blower 16 and the air blower 15. Although the case where the said module casing 27 is formed in the cover cylinder shape in the Example is shown, the shape of the said module casing 27 is not limited to the cover cylinder shape. That is, the module casing may be formed in an appropriate shape, for example, a shape corresponding to the shape of the filtration membrane module 11. In an embodiment, filtration and backwashing are done with one filtration / backwash pump 18, but filtration and backwashing may be done with separate pumps. Further, in the embodiment, a cylindrical hollow fiber membrane module such as polyvinylidene fluoride (PVDF) is used as the filtration membrane module 11, but the material of the filtration membrane module 11 may be an organic membrane or an inorganic membrane. Furthermore, the structure of the filtration membrane module 11 may be a flat membrane, a hollow fiber membrane, a monotube membrane. Further, in the above embodiment, the filtration membrane module cleaning apparatus has been mainly described. In this description, a cleaning chemical is injected into the secondary side of the filtration membrane module immersed in the reaction tank, the chemical liquid penetrates into the primary side of the filtration membrane module to clean the filtration membrane module, and the filtration membrane module is in the module casing. The air is introduced into the module casing, and the chemical liquid is injected into the secondary side of the filtration membrane module while the filtration membrane module is exposed to air, and the chemical liquid penetrates into the primary side of the filtration membrane module. Disclosed is a filtration membrane module cleaning method. Furthermore, in the above embodiment, when the filtration membrane module cleaning method and the filtration membrane module cleaning apparatus of the present invention are used in a membrane separation treatment system for treating soil and the like in domestic sewage and industrial wastewater by biological treatment and filtering by the filtration membrane module Is described. However, if necessary, the method and apparatus of the present invention can be used in a membrane separation treatment system in which coagulant is added to domestic sewage and industrial wastewater, to coagulate / precipitate contaminants, and to perform filtration by a filtration membrane module.

The present invention is not limited to the immersion membrane and can be applied to the casing accommodating membrane module.

1: raw water
2: screen tank
3: coarse screen
4: flow rate adjusting tank
6: denitration tank
7: reaction tank
8: return pump
9: sludge taking out valve
10: stirring device
11: filtration membrane module
12: filtered water piping
13: filtered water tank
15: diffuse blower (air exposing blower)
15a: air diffusing device for air exposure
16: scrubbing blower
17: scrubbing air diffusing device
18: filtering / backwash pump
19: first valve
20: second valve
21: first filtered water backflow passage
22: third valve
23: first filtered water backflow passage
24: fourth valve
25: filtration membrane module cleaning device
26: chemical solution pouring device
27: module casing (cleaning casing)
28: air feeding device
29: chemical solution tank
30: chemical solution feeding pump
31: chemical solution feeding passage
32: fifth valve
33: solution / air discharge valve
34: air feeding passage

Claims (5)

Injecting the cleaning chemical to the secondary side of the filtration membrane module immersed in the reactor, the chemical liquid penetrates into the primary side of the filtration membrane module to clean the filtration membrane module,
The filtration membrane module is accommodated in a module casing, air is introduced into the module casing, and the chemical liquid is injected into the secondary side of the filtration membrane module in a state where the filtration membrane module is exposed in the air, thereby transferring the chemical liquid to the 1 of the filtration membrane module. Filtration membrane module cleaning method, characterized in that permeate to the vehicle side. Including a chemical liquid injection device for injecting the cleaning chemical solution to the secondary side of the filter membrane module immersed in the reaction tank, the chemical liquid is injected into the secondary side of the filter membrane module by the chemical liquid injection device to clean the filter membrane module,
A module casing capable of storing air for accommodating the filtration membrane module to expose the filtration membrane module in air, and an air supply device for supplying air into the module casing to expose the filtration membrane module to air. Cleaning device. The method of claim 2,
Wherein said module casing has an opening at its bottom and is closed by a cover plate, and the cover plate is provided with a liquid / air discharge valve. The method of claim 3,
And the liquid / air discharge valve is an air pressure driving valve. The method according to any one of claims 2 to 4,
The filtration membrane module cleaning device, characterized in that the air supply device is also used as a scrubbing blower or air blower.

Images