JP2024003811A - Liquid treatment device, and method of operating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid treatment device capable of preventing treatment efficiency from remarkably deteriorating even when any of a plurality of membrane bodies disposed in a membrane device is damaged.

SOLUTION: The liquid treatment device comprises a membrane device 6 immersed in a liquid 3 to be treated located in a treatment tank 2, a gas supplier 8 supplying the membrane device 6 with oxygen-containing gas 7, and a gas discharger 9 discharging the oxygen-containing gas 7 from the membrane device 6. The membrane device 6 comprises a plurality of membrane bodies 14a to 14f. The membrane bodies 14a to 14f each include a gas permeating membrane and a bio-membrane which is formed on the outer surface of the gas permeating membrane and consumes the oxygen-containing gas 7. The gas supplier 8 comprises a plurality of gas supply branch pipes 22a to 22f branched from a gas supply pipe 21 and connected to the membrane bodies 14a to 14f respectively. The gas discharger 9 comprises a plurality of exhaust branch pipes 29a to 29f branched from the exhaust pipe 28 and connected to the membrane bodies 14a to 14f respectively. The gas supply branch pipes 22a to 22f are provided with first shut-off devices 33a to 33f respectively. The exhaust branch pipes 29a to 29f are provided with back-flow prevention devices 35a to 35f respectively, which prevent the backflow of the oxygen-containing gas 7 from the exhaust pipe 28 to the membrane bodies 14a to 14f.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a liquid treatment device that performs aerobic biological treatment on a liquid to be treated in a treatment tank.

Conventionally, as shown in FIG. 6, in this type of liquid processing apparatus, a plurality of oxygen dissolving membrane modules 102a to 102d are installed in parallel in a reaction tank 101, and air 103 is supplied to each membrane module 102a to 102d. and an air exhaust section 105 that discharges air 103 supplied to each membrane module 102a to 102d from each membrane module 102a to 102d.

These membrane modules 102a to 102d are immersed in the water to be treated 106 in the reaction tank 101, and hollow fiber membranes are used as oxygen dissolving membranes in the membrane modules 102a to 102d, with biological membranes on the outside of the hollow fiber membranes. It's attached.

The air supply unit 104 includes an air supply pipe 107 and a plurality of air supply branch pipes 108a to 108d branched from the air supply pipe 107 and connected to the upper end of each membrane module 102a to 102d. The air exhaust section 105 includes an exhaust pipe 109 and a plurality of exhaust branch pipes 110a to 110d branched from the exhaust pipe 109 and connected to the lower ends of each of the membrane modules 102a to 102d. Each of the air supply branch pipes 108a to 108d is provided with valves 111a to 111d that open and close the air supply branch pipes 108a to 108d.

According to this, all the valves 111a to 111d are opened and air 103 is supplied from the air supply pipe 107 to all the membrane modules 102a to 102d through all the air supply branch pipes 108a to 108d. As a result, air 103 is supplied to the biofilm through the hollow fiber membranes of each membrane module 102a to 102d, and the biofilm consumes oxygen in the air 103 to perform aerobic biological treatment.

The air 103 supplied to each membrane module 102a to 102d then passes through each exhaust branch pipe 110a to 110d from each membrane module 102a to 102d, joins the exhaust pipe 109, and is discharged to the outside of the reaction tank 101.

Incidentally, the liquid processing apparatus as described above is described, for example, in Patent Document 1 listed below.

JP2021-607

However, in the above-mentioned conventional type, if the hollow fiber membrane of one of the membrane modules 102c is damaged due to deterioration over time or collision with foreign matter mixed in the water to be treated 106, as shown in FIG. Bubbles 114 eject from the damaged location. In this case, the air 103 flows concentratedly into the broken membrane module 102c from the air supply pipe 107 and is ejected as air bubbles 114, and is mostly supplied to the other membrane modules 102a, 102b, and 102d other than the broken membrane module 102c. However, there is a problem that processing efficiency is significantly reduced.

The present invention provides a liquid processing device and a method of operating the same that can prevent a significant drop in processing efficiency even if any one of a plurality of membrane bodies provided in the membrane device is damaged. The purpose is to provide

In order to achieve the above object, the first invention is a liquid treatment device that performs aerobic biological treatment of a liquid to be treated in a treatment tank, comprising:
a membrane device immersed in the liquid to be treated in the treatment tank;
a gas supply unit that supplies oxygen-containing gas to the membrane device;
and a gas discharge section for discharging the oxygen-containing gas supplied to the membrane device from the membrane device,
The membrane device includes a plurality of membrane bodies,
The membrane body includes a gas permeable membrane having gas permeability, and a biological film formed on the outer surface of the gas permeable membrane and consuming oxygen-containing gas supplied to the membrane body,
The gas supply section includes an air supply pipe and a plurality of air supply branch pipes branched from the air supply pipe and connected to each membrane body,
The gas exhaust section includes an exhaust pipe and a plurality of exhaust branch pipes branched from the exhaust pipe and connected to each membrane body,
The air supply branch pipe is provided with a first opening/closing device that opens and closes the air supply branch pipe,
The first opening/closing device is located above the liquid level of the liquid to be treated in the treatment tank,
The exhaust branch pipe is provided with a backflow prevention device that prevents oxygen-containing gas from flowing back from the exhaust pipe to the membrane body.

According to this, all the first switching devices are opened and oxygen-containing gas is supplied from the air supply pipe to the gas permeable membrane of each membrane body through each air supply branch pipe. As a result, the oxygen-containing gas is supplied to the biofilm through the gas-permeable membrane of each membrane body, and the biofilm consumes oxygen from the oxygen-containing gas to perform aerobic biological treatment.

The oxygen-containing gas thus supplied to the gas permeable membrane of each membrane body passes through each exhaust branch pipe from each membrane body, joins the exhaust pipe, and is discharged from the exhaust pipe to the outside of the processing tank.

Furthermore, if the gas permeable membrane of one of the membrane bodies is damaged due to deterioration over time or collision of foreign matter mixed into the liquid to be treated, for example, bubbles will blow out from the damaged part of the membrane body. In this case, the first switching device corresponding to the damaged membrane is closed, and the air supply branch pipe connected to the damaged membrane is closed.

As a result, oxygen-containing gas is not supplied from the air supply pipe to the damaged membrane, and the blowout of bubbles is eliminated. At this time, since the remaining first switchgears other than the first switchgear corresponding to the damaged membrane body are kept open, the oxygen-containing gas is transferred from the air supply pipe to the remaining membrane bodies other than the damaged membrane body. It passes through each exhaust branch pipe connected to the remaining membrane bodies, joins the exhaust pipe, and is discharged from the exhaust pipe to the outside of the processing tank.

In addition, when the first switching device corresponding to the damaged membrane is closed as described above, the oxygen-containing gas in the exhaust pipe passes through the exhaust branch pipe connected to the damaged membrane and reaches the damaged membrane. Even if the oxygen-containing gas tries to flow back, the backflow of the oxygen-containing gas is prevented by the backflow prevention device of the exhaust branch pipe connected to the damaged membrane.

As a result, the damaged membrane body is not supplied with oxygen-containing gas, so the damaged membrane body does not contribute to aerobic biological treatment, but the remaining membrane bodies other than the damaged membrane body are supplied with oxygen-containing gas. Therefore, aerobic biological treatment is performed using the remaining membrane bodies other than the damaged one. Thereby, it is possible to prevent the processing efficiency from decreasing significantly.

In the liquid processing device according to the second aspect of the present invention, the air supply pipe is provided with a second opening/closing device that opens and closes the air supply pipe.

The liquid processing device according to the third aspect of the present invention is provided with an aeration device below the membrane device.

According to this, an upward flow is generated by performing air diffusion with an air diffuser, and the biological film of each membrane body is washed by the upward flow.

The fourth invention is a method of operating the liquid processing apparatus according to any one of the first to third inventions, comprising:
Opening all the first switching devices and supplying oxygen-containing gas from the air supply pipe to all the membrane bodies through all the air supply branch pipes,
When air bubbles blow out from any of the membrane bodies, close any of the first switching devices, and when the air bubbles blow out, the closed first switching device is kept in the closed state, and any of the first switching devices closes. If bubbles continue to blow out even after the opening/closing device is closed, the process of opening the closed first opening/closing device and closing another first opening/closing device is repeated until the bubbles stop blowing out.

According to this, if bubbles are spewing out on the liquid surface with all the first opening/closing devices open, one of the first opening/closing devices near the bubble jetting is closed. As a result, when the bubbles stop blowing out, it is determined that the membrane corresponding to the closed first switchgear is damaged, and the remaining first switchgear is left open to continue the aerobic biological treatment. I do.

In addition, if bubbles continue to be ejected even after closing any of the first switching devices near the bubble ejection, one of the membrane bodies other than the membrane corresponding to the closed first switching device is damaged. It is determined that this is the case, and the process of opening the closed first opening/closing device and closing another first opening/closing device is repeated until the bubble ejection is eliminated. Thereby, a damaged membrane body can be easily and accurately identified from among all membrane bodies.

A fifth invention is a method of operating a liquid processing apparatus according to any one of the first to third inventions, comprising:
Opening all the first switching devices and supplying oxygen-containing gas from the air supply pipe to all the membrane bodies through all the air supply branch pipes,
If bubbles are ejected from any of the plurality of membrane bodies, close the plurality of first opening/closing devices until the ejection of bubbles is eliminated;
If any of the closed first switchgear is opened and bubbles are confirmed to be ejected, the open first switchgear is closed, and if no bubbles are confirmed to be ejected, the remaining first switchgear is closed. By repeatedly opening any one of the closed first switchgears, multiple damaged membrane bodies can be identified and the air supply only to the multiple damaged membrane bodies can be stopped. be.

According to this, it is possible to easily and accurately identify multiple damaged membrane bodies from among all the membrane bodies, and by closing only the first switching device corresponding to the multiple damaged membrane bodies, the damaged membrane bodies can be identified easily and accurately. Air supply to only the membrane body can be stopped.

As described above, according to the present invention, since oxygen-containing gas is not supplied to the damaged membrane, the damaged membrane does not contribute to aerobic biological treatment, but the remaining membranes other than the damaged membrane are supplied with oxygen. Since the contained gas is supplied, aerobic biological treatment is performed using the remaining membrane bodies other than the damaged membrane body. Thereby, it is possible to prevent the processing efficiency from decreasing significantly.

FIG. 1 is a diagram of a liquid processing apparatus according to a first embodiment of the present invention. 2 is a view taken along the line XX in FIG. 1. FIG. It is a partially enlarged cross-sectional view of a hollow fiber membrane and a biofilm of the membrane module of the liquid treatment device. It is a figure which shows the situation when any one membrane module of the liquid processing apparatus is damaged. It is a figure which shows the situation when any two membrane modules of the liquid processing apparatus in the 2nd Embodiment of this invention are damaged. FIG. 1 is a diagram of a conventional liquid processing device. It is a figure which shows the situation when any membrane module of the liquid processing apparatus is damaged.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
In the first embodiment, as shown in FIGS. 1 and 2, 1 is used to treat liquid 3 (organic wastewater, sludge, etc.) in a treatment tank 2 in a sewage treatment plant, industrial wastewater treatment plant, etc. This is a liquid treatment device that performs aerobic biological treatment. The liquid treatment device 1 includes a treatment tank 2, a membrane unit 6 (an example of a membrane device) immersed in a liquid to be treated 3 in the treatment tank 2, and supplies air 7 (an example of an oxygen-containing gas) to the membrane unit 6. a gas supply section 8 for discharging the air 7 supplied to the membrane unit 6 from the membrane unit 6, a gas discharging section 9 for discharging the air 7 supplied to the membrane unit 6 from the membrane unit 6, and an air diffuser 10 provided below the membrane unit 6.

The treatment tank 2 is connected to a supply path 4 for supplying the liquid to be treated 3 into the tank and a discharge path 5 for discharging the liquid to be treated 3 to the outside of the tank.

The membrane unit 6 includes a plurality of membrane modules 14a to 14f (an example of a membrane body). In FIG. 1, as an example, six membrane modules 14a to 14f are arranged in parallel at a predetermined interval, but the number is not limited to six, and in reality, a large number (for example, from several dozen to 14f) are arranged in parallel. It is equipped with several hundred membrane modules.

As shown in FIGS. 2 and 3, each membrane module 14a to 14f includes a plurality (many) of hollow fiber membranes 15 (an example of a gas permeable membrane) having gas permeability, and an outer surface of the hollow fiber membrane 15. It comprises a biofilm 16 that forms and consumes the air 7 supplied to the membrane modules 14a-14f, and upper and lower headers 17, 18.

The plurality of hollow fiber membranes 15 are formed in a sheet shape, and the upper ends of the hollow fiber membranes 15 open into the internal space of the upper header 17, and the lower ends of the hollow fiber membranes 15 open into the internal space of the lower header 18. .

As shown in FIGS. 1 and 2, the gas supply section 8 is connected to an air supply pipe 21 provided above the membrane unit 6 and an upper header 17 of each membrane module 14a to 14f branched from the air supply pipe 21. A plurality of air supply branch pipes 22a to 22f are provided. The air supply pipe 21 is provided with a first blower device 23 that sends air 7 from the upstream side, and an air supply source valve 24 (an example of a second opening/closing device) that opens and closes the air supply pipe 21.

The gas exhaust section 9 includes an exhaust pipe 28 provided below the membrane unit 6, and a plurality of exhaust branch pipes 29a to 29f branched from the exhaust pipe 28 and connected to the lower header 18 of each membrane module 14a to 14f. It is equipped with An exhaust valve 30 is connected to the downstream side of the exhaust pipe 28.

Each of the air supply branch pipes 22a to 22f is provided with a plurality of air supply cock valves 33a to 33f (an example of a first opening/closing device) that individually open and close these air supply branch pipes 22a to 22f. These air supply cock valves 33a to 33f are located above the liquid level 3a of the liquid to be processed 3 in the processing tank 2.

Each of the exhaust branch pipes 29a to 29f is provided with check valves 35a to 35f (an example of a backflow prevention device) that prevent backflow of air 7 from the exhaust pipe 28 to each of the membrane modules 14a to 14f.

The air diffuser 10 includes a plurality of air diffusers 40 , a second blower device 41 and an air diffuser valve 42 connected to the air diffusers 40 .

The operation of the above configuration will be explained below.

As shown in FIG. 1, the air 7 is supplied from the first blower device 23 by driving the first blower device 23 with the air supply source valve 24 and all the air supply cock valves 33a to 33f open. The air flows through the trachea 21 and is supplied to each membrane module 14a to 14f through each air supply branch pipe 22a to 22f. As a result, the air 7 is supplied to the biofilm 16 through the hollow fiber membranes 15 of each of the membrane modules 14a to 14f, and the biofilm 16 consumes oxygen in the air 7 to perform aerobic biological treatment.

The air 7 thus supplied to the hollow fiber membranes 15 of each membrane module 14a to 14f passes through each exhaust branch pipe 29a to 29f from each membrane module 14a to 14f, joins the exhaust pipe 28, and joins the exhaust pipe 28. is discharged to the outside of the processing tank 2.

Furthermore, if one of the membrane modules 14c is damaged due to deterioration over time or collision with foreign matter mixed in the liquid to be treated 3, as shown in FIG. Occur. In this case, the air supply cock valve 33c corresponding to the damaged membrane module 14c is closed, and the air supply branch pipe 22c connected to the damaged membrane module 14c is closed.

As a result, the air 7 is not supplied from the air supply pipe 21 to the damaged membrane module 14c, and the blowout of the air bubbles 45 is eliminated. At this time, since the remaining air supply cock valves 33a, 33b, 33d to 33f other than the air supply cock valve 33c corresponding to the damaged membrane module 14c are kept open, the air 7 is removed from the damaged air supply pipe 21. The exhaust branch pipes 29a, 29b, 29d to 29f are supplied to the remaining membrane modules 14a, 14b, 14d to 14f other than the membrane module 14c that has been used, and are connected to the remaining membrane modules 14a, 14b, 14d to 14f. The gas flows through the exhaust pipe 28, joins the exhaust pipe 28, and is discharged from the exhaust pipe 28 to the outside of the processing tank 2.

In addition, when the air supply cock valve 33c corresponding to the damaged membrane module 14c is closed as described above, the air 7 in the exhaust pipe 28 passes through the exhaust branch pipe 29c connected to the damaged membrane module 14c. Even if the air 7 attempts to flow back into the damaged membrane module 14c, the check valve 35c of the exhaust branch pipe 29c prevents the air 7 from flowing back.

As a result, air 7 is not supplied to the damaged membrane module 14c, so the damaged membrane module 14c does not contribute to aerobic biological treatment, but the remaining membrane modules 14a, 14b, 14d to 14f other than the damaged membrane module 14c Since air 7 is supplied to , aerobic biological treatment is performed by the remaining membrane modules 14a, 14b, 14d to 14f other than the damaged membrane module 14c. Thereby, it is possible to prevent the processing efficiency from decreasing significantly.

Furthermore, by driving the second blower device 41 of the aeration device 10 and opening the aeration valve 42 at predetermined intervals, air is blown out from the aeration pipe 40 to perform aeration. As a result, an upward flow is generated in the liquid to be treated 3, and the biofilm 16 of each membrane module 14a to 14f is cleaned (scarred) by the upward flow, and the biofilm 16 can be adjusted to an appropriate thickness. can.

A method of operating the liquid processing apparatus 1 as described above will be explained below.

As shown in FIG. 1, the first blower device 23 is driven, the air supply source valve 24 and all the air supply cock valves 33a to 33f are opened, and the air 7 is transferred from the air supply pipe 21 to all the air supply branch pipes 22a. -22f to all membrane modules 14a-14f. As a result, aerobic biological treatment is performed by all membrane modules 14a to 14f. At this time, the air 7 flows from top to bottom inside the hollow fiber membrane 15 of each membrane module 14a to 14f, and if air bubbles 45 are not ejected from each membrane module 14a to 14f, all membrane modules 14a to 14f are damaged. It is determined that this is not the case and is normal.

Further, as shown in FIG. 4, when air bubbles 45 are ejected from any one of the membrane modules 14a to 14f (for example, the membrane module 14c), any one of the air supply cock valves 33a to 33f (for example, the air supply cock When the valve 33c) is closed and the ejection of air bubbles 45 is eliminated, it is determined that the membrane module 14c corresponding to the closed air supply cock valve 33c is damaged, and the air supply cock valve 33c is kept closed. The remaining air supply cock valves 33a, 33b, 33d to 33f are kept open to continue aerobic biological treatment.

Furthermore, even if any one of the air supply cock valves 33a to 33f (for example, not the air supply cock valve 33c but the air supply cock valve 33d next to it) is closed, if bubbles 45 continue to blow out, the air bubbles 45 may be closed. It is determined that any of the membrane modules 14a to 14c, 14e, 14f other than the membrane module 14d corresponding to the air supply cock valve 33d is damaged, and the air supply cock valve is closed until the blowout of air bubbles 45 is eliminated. 33d and closing the other air supply cock valves 33a to 33c, 33e, and 33f one by one is repeated.

This makes it possible to easily and accurately identify the damaged membrane module 14c from among all the membrane modules 14a to 14f.

In the first embodiment, as shown in FIG. 4, the air 7 is not supplied to one damaged membrane module 14c, and the air 7 is supplied to the remaining undamaged membrane modules 14a, 14b, 14d to 14f. However, when the number of damaged membrane modules increases and a predetermined ratio of the number of membrane modules to the total number of membrane modules 14a to 14f is damaged, the membrane unit 6 is processed. The damaged membrane module may be replaced with a new membrane module by pulling it out from inside the tank 2. For example, if the total number of membrane modules provided in the membrane unit 6 is 100 and the predetermined ratio is 10%, then when 10 of the 100 membrane modules are damaged, the membrane unit 6 is removed from the treatment tank 2. The 10 damaged membrane modules will be replaced with new ones.

In the first embodiment, as shown in FIG. 4, the case where the membrane module 14c is damaged is explained as an example, but any one of the membrane modules 14a, 14b, 14d to 14f other than the membrane module 14c is damaged. The same applies if it is damaged.
(Second embodiment)
In the first embodiment described above, as shown in FIG. 4, an operation method was described in which one of the plurality of membrane modules 14a to 14f (for example, the membrane module 14c) was damaged. In the embodiment, an operation method when any two of the plurality of membrane modules 14a to 14f are damaged will be described below.

For example, as shown in FIG. 5, when two membrane modules 14c and 14e out of the plurality of membrane modules 14a to 14f are damaged and bubbles 45 are ejected from the membrane modules 14c and 14e, first, the bubbles 45 are Close the multiple air cock valves until the blowout is resolved. For example, assume that the blowout of the air bubbles 45 is stopped when the four air supply cock valves 33b to 33e are closed.

Next, any one of the four closed air supply cock valves 33b to 33e is opened, and it is confirmed whether or not air bubbles 45 are ejected. For example, when the air supply cock valve 33b is opened, the membrane module 14b corresponding to the air supply cock valve 33b is not damaged, so no bubbles 45 are observed to be ejected.

Next, any one of the remaining three closed air supply cock valves 33c to 33e is opened, and it is confirmed whether or not air bubbles 45 are ejected. For example, when the air supply cock valve 33c is opened, the membrane module 14c corresponding to the air supply cock valve 33c is damaged, so air bubbles 45 are ejected from the membrane module 14c. As a result, the ejection of air bubbles 45 is confirmed, and then the opened air supply cock valve 33c is closed. This shows that the membrane module 14c is damaged.

After that, one of the remaining two closed air supply cock valves 33d and 33e is opened, and it is confirmed whether or not air bubbles 45 are ejected. For example, when the air supply cock valve 33d is opened, the membrane module 14d corresponding to the air supply cock valve 33d is not damaged, so no bubbles 45 are observed to be ejected.

Furthermore, the remaining closed air supply cock valve 33e is opened to check whether bubbles 45 are being ejected. In this case, since the membrane module 14e corresponding to the air supply cock valve 33e is damaged, air bubbles 45 are ejected from the membrane module 14e. As a result, the ejection of air bubbles 45 is confirmed, and then the opened air supply cock valve 33e is closed. This shows that the membrane module 14e is damaged.

As described above, it is possible to easily and accurately identify the two damaged membrane modules 14c and 14e from among all the membrane modules 14a to 14f, and close only the two air supply cock valves 33c and 33e. Air supply to only the two membrane modules 14c and 14e can be stopped.

In the second embodiment, two membrane modules 14c and 14e out of all the membrane modules 14a to 14f are damaged, but two membrane modules other than these membrane modules 14c and 14e are damaged. The same applies if it is damaged. Furthermore, the problem is not limited to the case where two membrane modules are damaged, but the same applies when three or more membrane modules are damaged.

In each of the above embodiments, six membrane modules 14a to 14f are shown as shown in FIGS. 1, 4, and 5 in order to make the explanation easier to understand, but the number is not limited to six. It may be equipped with a large number (for example, several tens to several hundreds) of membrane modules.

In the above embodiment, the air supply cock valves 33a to 33f are used as examples of the opening/closing device, but other types of valves than cock valves may be used.

1 Liquid processing device 2 Processing tank 3 Liquid to be treated 3a Liquid level 6 Membrane unit (membrane device)
7 Air (oxygen-containing gas)
8 Gas supply section 9 Gas discharge section 10 Diffusers 14a to 14f Membrane module (membrane body)
15 Hollow fiber membrane (gas permeable membrane)
16 Biofilm 21 Air supply pipes 22a to 22f Air supply branch pipe 24 Air supply source valve (second opening/closing device)
28 Exhaust pipes 29a to 29f Exhaust branch pipes 33a to 33f Air supply cock valve (first opening/closing device)
35a to 35f Check valve (backflow prevention device)
45 Bubbles

Claims (5)

A liquid treatment device that performs aerobic biological treatment on a liquid to be treated in a treatment tank,
a membrane device immersed in the liquid to be treated in the treatment tank;
a gas supply unit that supplies oxygen-containing gas to the membrane device;
and a gas discharge section for discharging the oxygen-containing gas supplied to the membrane device from the membrane device,
The membrane device includes a plurality of membrane bodies,
The membrane body includes a gas permeable membrane having gas permeability, and a biological film formed on the outer surface of the gas permeable membrane and consuming oxygen-containing gas supplied to the membrane body,
The gas supply section includes an air supply pipe and a plurality of air supply branch pipes branched from the air supply pipe and connected to each membrane body,
The gas exhaust section includes an exhaust pipe and a plurality of exhaust branch pipes branched from the exhaust pipe and connected to each membrane body,
The air supply branch pipe is provided with a first opening/closing device that opens and closes the air supply branch pipe,
The first opening/closing device is located above the liquid level of the liquid to be treated in the treatment tank,
A liquid processing device characterized in that an exhaust branch pipe is provided with a backflow prevention device that prevents oxygen-containing gas from flowing back from the exhaust pipe to the membrane body. 2. The liquid processing apparatus according to claim 1, wherein the air supply pipe is provided with a second opening/closing device for opening and closing the air supply pipe. 2. The liquid processing device according to claim 1, further comprising an aeration device provided below the membrane device. A method of operating a liquid processing device according to any one of claims 1 to 3 above, comprising:
Opening all the first switching devices and supplying oxygen-containing gas from the air supply pipe to all the membrane bodies through all the air supply branch pipes,
When air bubbles blow out from any of the membrane bodies, close any of the first switching devices, and when the air bubbles blow out, the closed first switching device is kept in the closed state, and any of the first switching devices closes. Even if the opening/closing device is closed, if bubbles continue to blow out, the process of opening the closed first opening/closing device and closing another first opening/closing device is repeated until the bubbles stop blowing out. How to operate liquid processing equipment. A method of operating a liquid processing device according to any one of claims 1 to 3 above, comprising:
Opening all the first switching devices and supplying oxygen-containing gas from the air supply pipe to all the membrane bodies through all the air supply branch pipes,
If bubbles are ejected from any of the plurality of membrane bodies, close the plurality of first opening/closing devices until the ejection of bubbles is eliminated;
If any of the closed first switchgear is opened and bubbles are confirmed to be ejected, the open first switchgear is closed, and if no bubbles are confirmed to be ejected, the remaining first switchgear is closed. By repeatedly opening any one of the closed first switchgears, a plurality of damaged membrane bodies can be identified, and the air supply can be stopped only to the plurality of damaged membrane bodies. How to operate the characteristic liquid processing equipment.

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