JP6866617B2 - Membrane separation activated sludge device, water treatment method - Google Patents

Description

The present invention relates to a siphon type air diffuser, a membrane separation activated sludge device, and a water treatment method.

Industrial wastewater and domestic wastewater are treated to remove organic substances and the like contained in the wastewater, and then reused as industrial water or discharged into rivers and the like. Examples of the treatment method for industrial wastewater include the activated sludge method. The activated sludge method is a method of decomposing organic substances and the like by aeration and aerobic microorganisms.

Further, in recent years, treatment by the membrane separation activated sludge (MBR) method, which is a combination of treatment by the activated sludge method and membrane filtration by a separation membrane module, has come to be performed. In the treatment by the MBR method, as the membrane filtration is continued, organic substances and the like are deposited on the surface of the separation membrane, which may cause a decrease in the filtration flow rate and an increase in the intermembrane differential pressure.

In response to this problem, in the treatment by the MBR method, the deposition of organic substances on the membrane surface is suppressed by the air diffuser tube installed below the membrane module. Specifically, the deposition of organic substances and the like on the membrane surface is suppressed by vibrating the membrane itself by the impact when the bubbles generated from the air diffuser come into contact with the membrane surface or the water flow accompanying the generation of the bubbles.

From the viewpoint of cleanability of the film surface, it is preferable that the size of the bubbles is large, but on the other hand, a large amount of energy is required. Patent Document 1 discloses a siphon type air diffuser that efficiently discharges large bubbles.

Japanese Unexamined Patent Publication No. 2003-340250

However, since the siphon type air diffuser described in Patent Document 1 cannot adjust the size and intermittent time of bubbles, it continues to emit huge bubbles even in a situation where high detergency is not required. Therefore, the energy efficiency may be low in the treatment by the MBR method to which the above siphon type air diffuser is applied. In addition, as the size of the bubbles increases, the efficiency of dissolution in water decreases, so oxygen required for biological treatment is insufficient, and the properties of sludge and the quality of treated water may deteriorate.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a siphon type air diffuser and a membrane separation activated sludge device capable of adjusting the size and intermittent time of bubbles, and a water treatment method. And.

In order to solve the above problems, the present invention has the following aspects.
[1] A siphon type air diffuser that intermittently exposes air, and communicates with a siphon room including a first siphon room and a second siphon room for storing air and the first siphon room and the second siphon room. Of the communication portion, the air diffuser hole provided downstream of the siphon chamber, the air supply means for supplying the air to the siphon chamber, and the route from the siphon chamber to the air diffuser hole, the siphon chamber. A siphon type air diffuser provided with an adjusting mechanism capable of adjusting the opening amount of the opening provided in a portion not facing the communication portion.
[2] The siphon type air diffuser according to [1], wherein the adjusting mechanism includes a lid member that closes the opening and a driving unit that drives the lid member.
[3] The opening includes a first opening and a second opening, and the adjusting mechanism includes a first plug member that can be attached to and detached from the first opening, and the second opening. The siphon type air diffuser according to [1], which has a second plug member that can be attached to and detached from the portion.
[4] A membrane separation activated sludge apparatus comprising the siphon type air diffuser according to any one of [1] to [3] and a membrane module for membrane separation of sludge-containing treated water containing activated sludge.
[5] The siphon type air diffuser according to [2], a membrane module for membrane separation of sludge-containing treated water containing activated sludge, an intermembrane differential pressure in the membrane module, or a dissolved oxygen concentration of the sludge-containing treated water. A membrane separation activated sludge device including a detection unit that detects at least one of the detection units, and a control unit that determines the opening amount based on the detection result of the detection unit and controls the drive unit.
[6] The siphon type air diffuser according to [3], a membrane module for membrane separation of sludge-containing treated water containing activated sludge, an intermembrane differential pressure in the membrane module, or a dissolved oxygen concentration of the sludge-containing treated water. A membrane separation activated sludge device including a detection unit that detects at least one of the detection units, and a notification means that determines and notifies the opening amount based on the detection result of the detection unit.
[7] It has an activated sludge treatment step of treating raw water with activated sludge using activated sludge, and a membrane separation step of membrane separation treatment of sludge-containing treated water obtained in the activated sludge treatment step. A water treatment method using the membrane separation activated sludge apparatus according to any one of [4] to [6] in the step.

According to one aspect of the present invention, there is provided a siphon type air diffuser and a membrane separation activated sludge device capable of adjusting the size and intermittent time of bubbles, and a water treatment method.

The figure which shows the schematic structure of the water treatment apparatus which concerns on the water treatment method of 1st Embodiment. The perspective view of the siphon type air diffuser 1 of 1st Embodiment. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. The schematic schematic diagram explaining the operation mechanism in the siphon type air diffuser 1 of 1st Embodiment. The schematic schematic diagram which shows the adjustment mechanism 23 of 1st Embodiment. The schematic schematic diagram which shows the adjustment mechanism 231 of the 2nd Embodiment. The schematic block diagram which shows the adjustment mechanism 23A which concerns on the modification of 1st Embodiment. A graph showing the result of evaluation 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings below, the dimensions and ratios of the components are appropriately different in order to make the drawings easier to see.

<First Embodiment>
[Water treatment method]
The water treatment method of the first embodiment includes an activated sludge treatment step of treating raw water with activated sludge using activated sludge, and a membrane separation step of separating the sludge-containing treated water obtained in the activated sludge treatment step. doing.

First, the configuration of the water treatment apparatus 1000 used in the water treatment method of the first embodiment will be described.
FIG. 1 is a diagram showing a schematic configuration of a water treatment apparatus according to the water treatment method of the first embodiment. As shown in FIG. 1, the water treatment apparatus 1000 of the present embodiment includes an activated sludge treatment tank 11, a membrane separation tank 21, and a treatment water tank 41.

Further, although not shown, the water treatment apparatus 1000 includes a flow rate adjusting tank for adjusting the flow rate of raw water flowing into the activated sludge treatment tank 11, a drawing pump for drawing excess sludge from the membrane separation tank 21, and a membrane separation tank 21. It is provided with a liquid feeding means for sending a chemical solution or diluted water, and a discharging means for discharging the treated water from the treated water tank 41 to a factory, a river, or the like.

In the water treatment method using a water treatment device, first, wastewater (raw water) such as industrial wastewater and domestic wastewater is treated with activated sludge in the activated sludge treatment tank 11 to obtain biologically treated water (activated sludge treatment step). Next, in the membrane separation tank 21 provided downstream of the activated sludge treatment tank 11, sludge-containing treated water containing activated sludge and biologically treated water is subjected to membrane separation treatment (membrane separation step). A part of the sludge-containing treated water is returned from the membrane separation tank 21 to the activated sludge treatment tank 11 by the sludge returning means 30. The treated water after the sludge-containing treated water is membrane-separated is stored in the treated water tank 41.

(Activated sludge treatment tank)
The activated sludge treatment tank 11 is filled with activated sludge for performing activated sludge treatment.
The activated sludge treatment tank 11 is connected to a first flow path 12 and a second flow path 13. The first flow path 12 is a flow path for flowing raw water discharged from a factory, a household, or the like into the activated sludge treatment tank 11. On the other hand, the second flow path 13 is a flow path for flowing the sludge-containing treated water discharged from the activated sludge treatment tank 11 into the membrane separation tank 21.

Further, an air diffuser 14 is installed in the activated sludge treatment tank 11 in order to maintain the inside of the tank under aerobic conditions.
The air diffuser 14 includes an air diffuser 14a that diffuses air into the activated sludge treatment tank 11, an introduction pipe 14b that supplies air to the air diffuser 14a, and a blower 14c that supplies air.
The air diffuser tube 14a is not particularly limited as long as it can discharge the air supplied from the blower 14c upward, and examples thereof include a single tube with a hole and a membrane type.

(Membrane separation tank)
The membrane separation tank 21 stores sludge-containing treated water containing activated sludge and biologically treated water sent from the activated sludge treatment tank 11.
The membrane separation tank 21 includes a membrane separation activated sludge device 100 to which one aspect of the present invention is applied. The membrane separation activated sludge device 100 will be described later.

(Sludge return means)
The sludge returning means 30 returns a part of the sludge-containing treated water from the membrane separation tank 21 to the activated sludge treatment tank 11.
The sludge returning means 30 includes a fourth flow path 31. The fourth flow path 31 is a flow path in which a part of the sludge-containing treated water is discharged from the membrane separation tank 21 and flows into the activated sludge treatment tank 11.
A pump 31a is installed in the fourth flow path 31. As a result, a part of the sludge-containing treated water in the membrane separation tank 21 can be returned from the membrane separation tank 21 to the activated sludge treatment tank 11.

(Treatment water tank)
The treated water tank 41 stores the treated water after the sludge-containing treated water is membrane-separated.

[Membrane separation activated sludge device]
As shown in FIG. 1, the membrane separation activated sludge device 100 (hereinafter, may be referred to as “MBR device 100”) includes a membrane module 22 and a siphon type air diffuser 1 provided below the membrane module 22. , A detection unit 26, and a control unit 28 connected to the detection unit 26.

(Membrane module)
The membrane module 22 separates the sludge-containing treated water containing activated sludge into a membrane. The membrane module 22 includes a separation membrane, and the sludge-containing treated water is solid-liquid separated (membrane separation) into biologically treated water and activated sludge by this separation membrane.

The separation membrane is not particularly limited as long as it has a separation ability, and examples thereof include a hollow fiber membrane, a flat membrane, a tubular membrane, and a monolith type membrane. Among these, a hollow fiber membrane is preferable because it has a high volume filling rate.

When a hollow fiber membrane is used as the separation membrane, examples of the material thereof include cellulose, polyolefin, polysulfone, polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE). Among these, PVDF and PTFE are preferable as the material of the hollow fiber membrane from the viewpoint of chemical resistance and resistance to pH change.
When a monolith type membrane is used as the separation membrane, it is preferable to use a ceramic membrane.

The average pore diameter of the fine pores formed in the separation membrane is about 0.001 to 0.1 μm for a membrane generally called an extramargin separation membrane, and about 0.1 to 1 μm for a membrane generally called a precision separation membrane. .. In this embodiment, it is preferable to use a separation membrane having an average pore size within the above range.

A third flow path 33 is connected to the membrane module 22. The third flow path 33 is a flow path for discharging the treated water that has passed through the separation membrane from the membrane separation tank 21 and flowing it into the treated water tank 41.
A pump 33a is installed in the third flow path 33. As a result, the treated water that has passed through the separation membrane of the membrane module 22 can be discharged from the membrane separation tank 21.

(Siphon type air diffuser)
The siphon type air diffuser 1 includes an introduction pipe 1a for supplying air to the siphon type air diffuser 1 and a blower 1b for supplying air. The configuration including the introduction pipe 1a and the blower 1b corresponds to an air supply means for supplying air to the siphon chamber within the scope of claims.
The siphon type air diffuser 1 is an air diffuser that intermittently aerates air by utilizing the siphon action.

FIG. 2 is a perspective view of the siphon type air diffuser 1 of the first embodiment, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. The arrow shown in FIG. 3 represents the flow of treated water in the siphon type air diffuser 1. As shown in FIGS. 2 and 3, the siphon type air diffuser 1 includes a siphon chamber 2, an air supply port 3, a path 4, an air diffuser 6, a treated water inflow port 7, and an opening 8. ing.

The siphon type air diffuser 1 is a box-shaped housing formed by combining a plurality of plate-shaped members, and includes an upper plate 1A, four side plates 1B, a bottom plate 1C, a first partition wall 4a, and a second partition. It has a wall 4b and. The side plate 1B and the first partition wall 4a extend below the upper plate 1A from the upper plate 1A. The second partition wall 4b extends from the bottom plate 1C above the bottom plate 1C and is located on the side plate 1B side of the first partition wall 4a. The first partition wall 4a and the second partition wall 4b face each other.

The siphon chamber 2 refers to a space defined by the height of the upper end 4b _{1 of the second partition wall 4b and the height of the lower end 4a 1} of the first partition wall 4a, and the space is defined by the second partition wall 4b. It is divided into a first siphon room 2A and a second siphon room 2B. The upper part of the first siphon chamber 2A and the upper part of the second siphon chamber 2B communicate with the communication portion 5. A part of the first partition wall 4a faces the siphon chamber 2 and the route 4. In other words, a part of the first partition wall 4a separates the siphon chamber 2 from the path 4. A part of the second partition wall 4b faces the siphon chamber 2. _{The upper end 4b 1} of the second partition wall 4b is located at least above _{the lower end 4a 1} of the first partition wall 4a.

An air supply port 3 is provided in a portion of the upper plate 1A facing the communication portion 5. The communication portion 5 communicates with an introduction pipe 1a (see FIG. 1) that supplies air through the air supply port 3. Thereby, in the present embodiment, it is possible to store air in the siphon chamber 2 communicating with the communication unit 5.

Further, the upper plate 1A is provided with an air diffuser hole 6, and the air diffuser hole 6 is provided downstream of the siphon chamber 2. The bottom plate 1C is smaller than the length of the top plate 1A. The treated water inflow port 7 refers to a gap formed by the side plate 1B and the bottom plate 1C. The treated water inflow port 7 is located below (or upstream) of the siphon chamber 2. The treated water inflow port 7 communicates the outside of the siphon type air diffuser 1 with the siphon chamber 2. Further, the treated water inflow port 7 is located below _{the lower end 4a 1 of the first partition wall 4a.}

Route 4 refers to a route from the siphon chamber 2 to the air diffuser 6. The rest of the second partition wall 4b and the first partition wall 4a face the path 4.
The opening 8 shown in FIG. 1 is provided in the bottom plate 1C, but is not limited to this, and is provided in a portion of the path 4 that does not face the siphon chamber 2 and the communication portion 5. In other words, the opening 8 is not provided in the first partition wall 4a.

The siphon type air diffuser 1 is provided at a position where the air diffuser holes 6 overlap between the separation membranes in the membrane module 22 when the membrane separation tank 21 is viewed in a plan view.

Further, the siphon type air diffuser 1 is provided with an adjusting mechanism 23 capable of adjusting the opening amount of the opening 8. The adjusting mechanism 23 has a lid member 24 that closes the opening 8 and a driving unit 25 that drives the lid member 24.

Hereinafter, the operation mechanism of the siphon type air diffuser 1 will be described with reference to FIG. FIG. 4 is a schematic schematic diagram illustrating an operating mechanism of the siphon type air diffuser 1 of the first embodiment. As shown in FIG. 4A, the siphon chamber 2, the communication portion 5 (see FIG. 3), and the path 4 are filled with sludge-containing treated water in the state before the start of operation. Here, air is continuously supplied from the introduction pipe 1a through the air supply port 3.

When the air is continuously supplied from the air supply port 3, the sludge-containing treated water in the siphon chamber 2 is pushed out from the air diffuser hole 6 and the treated water inflow port 7 as shown in FIG. 4 (b), and the siphon chamber 2 The liquid level S of the above gradually drops.

Further, when the air is continuously supplied from the air supply port 3 and the height of the liquid level S _{becomes lower than the lower end 4a 1} of the first partition wall 4a, as shown in FIG. 4C, the siphon chamber 2 and the communication portion 5 The air A stored in the air A moves to the path 4. The path 4 is in a decompressed state more than the siphon chamber 2 due to the opening 8. Therefore, the sludge-containing treated water flows into the path 4 through the opening 8. As a result of the sludge-containing treated water B flowing into the path 4, as shown in FIG. 4D, a part of the air A1 is pushed back to the siphon chamber 2 and the communication portion 5 by the sludge-containing treated water B that has flowed in. On the other hand, the remaining air A2 is discharged from the air diffuser hole 6 as it is to form bubbles 20.

After the bubbles 20 are released, the pushed back air brings the state shown in FIG. 4 (b), and the states of FIGS. 4 (b) to 4 (d) are repeated.

Here, in the conventional siphon type air diffuser having no opening 8, when the height of the liquid level S _{is lower than the lower end 4a 1} of the first partition wall 4a, it is stored in the siphon chamber 2 and the communication portion 5. Air is discharged from the air diffuser 6 at once. After releasing the air, the siphon chamber 2, the communication portion 5, and the path 4 are filled with sludge-containing treated water again, and the state shown in FIG. 4A is obtained. Therefore, in the conventional siphon type air diffuser, the time (intermittent time) from the release of air to the next release of air becomes long. Further, since the amount of air to be stored is theoretically equal to the volume of the siphon chamber 2 and the communication portion 5, the size and intermittent time of the bubbles 20 to be formed are constant.

On the other hand, as the amount of sludge-containing treated water B flowing in increases, the amount of air A1 pushed back increases, and the amount of air A2 reaching the air diffuser hole 6 decreases. That is, the larger the amount of sludge-containing treated water B that flows in, the smaller the size of the bubbles formed. The amount of sludge-containing treated water B flowing in can be adjusted by the amount of opening of the opening 8. Therefore, the size of the bubbles can be adjusted by adjusting the opening amount of the opening 8.

Further, the amount of air remaining in the siphon chamber 2 and the communication portion 5 is also adjusted by the opening amount of the opening 8. Therefore, if the amount of residual air is large, the amount of air to be supplied can be small, and the intermittent time is shorter than that of the conventional siphon type air diffuser. Therefore, the intermittent time can be adjusted by adjusting the opening amount of the opening 8.

FIG. 5 is a schematic schematic view showing the adjusting mechanism 23 of the first embodiment. As shown in FIG. 5, the lid member 24 has a first member 24a, a second member 24b, and a third member 24c. In the adjusting mechanism 23, the opening amount of the opening 8 can be adjusted by sliding the three first members 24a, the second member 24b, and the third member 24c in order by the driving unit 25. The first to third members 24a to 24c may be connected to each other or may be independent of each other.

(Detection unit)
The detection unit 26 detects at least one of the intermembrane differential pressure in the membrane module 22 and the dissolved oxygen concentration of the sludge-containing treated water.

(Control unit)
The control unit 28 determines the opening amount of the opening 8 based on the detection result of the detection unit 26, and controls the drive unit 25.

According to the siphon type air diffuser 1 having the above configuration, the size of the bubbles and the intermittent time can be adjusted. In particular, since it has a drive unit 25 that drives the lid member 24 to adjust the opening amount and a control unit 28 that controls the drive unit 25, it is possible to automatically adjust the size of bubbles and the intermittent time. it can.

Further, according to the MBR device provided with such a siphon type air diffuser 1, the organic matter contained in the raw water is effectively suppressed from being deposited on the film surface, and the dissolved oxygen concentration of the sludge-containing treated water is converted into activated sludge. It can be maintained at a suitable concentration.

Further, according to the water treatment method using the MBR device 100, bubbles having an appropriate size can be released according to the intermembrane differential pressure of the membrane module 22 and the dissolved oxygen concentration of the sludge-containing treated water. , It is possible to make the energy efficiency higher than before.

<Second Embodiment>
Hereinafter, the siphon type air diffuser of the second embodiment of the present invention will be described. The siphon type air diffuser of the second embodiment has a different adjustment mechanism from the siphon type air diffuser 1 of the first embodiment. Therefore, the components common to the first embodiment in the present embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a schematic schematic view showing the adjusting mechanism 231 of the second embodiment. As shown in FIG. 6, in the present embodiment, the opening 81 includes a first opening 81A, a second opening 81B, a third opening 81C, and a fourth opening 81D. ..
Here, the first opening 81A corresponds to the first opening in the claims. The second opening 81B corresponds to the second opening in the claims.

As shown in FIG. 6, the adjusting mechanism 231 includes a first plug member 241A that can be attached to and detached from the first opening 81A, a second plug member 241B that can be attached to and detached from the second opening 81B, and a third. It has a third plug member (not shown) that can be attached to and detached from the opening 81C, and a fourth plug member (not shown) that can be attached to and detached from the fourth opening 81D.
Here, the first plug member 241A corresponds to the first plug member within the scope of the claims. The second plug member 241B corresponds to the second plug member within the scope of the claims.

In the adjusting mechanism 231, the opening amount of the opening 8 can be adjusted by attaching and detaching the first to fourth plug members 241A to 241D.

The MBR device to which the siphon type air diffuser 101 provided with the adjusting mechanism 231 is applied includes a notification means (not shown) that determines the opening amount based on the detection result of the detection unit 26 and notifies the operator. The operator manually removes the first to fourth plug members 241A to 241D so as to have the opening amount notified by the notification means.

As described above, according to the siphon type air diffuser 101 of the present embodiment, the size of the bubbles and the intermittent time can be adjusted as in the first embodiment. In particular, since the opening amount can be adjusted manually, the cost can be reduced by simplifying the device configuration of the siphon type air diffuser 101 and the MBR device to which the siphon type air diffuser 101 is applied.

The siphon type air diffuser and membrane separation activated sludge device according to one aspect of the present invention, and the water treatment method are not limited to the above-described embodiments.
For example, in the first embodiment, the lid member 24 has a slidable configuration, but it may have a rotatable configuration. FIG. 7 is a schematic configuration diagram showing an adjustment mechanism 23A according to a modified example of the first embodiment. As shown in FIG. 7, the adjusting mechanism 23A has a lid member 27 that closes the opening 8 and a driving unit 25 that drives the lid member 27. The lid member 27 is composed of a first lid member 27A and a second lid member 27B. The first lid member 27A and the second lid member 27B are rotatable with respect to the opening 8 by the shafts 29A and 29B, respectively. According to this configuration, based on the detection result of the detection unit 26, the control unit 28 adjusts the rotation amount (rotation angle) of the first lid member 27A and the second lid member 27B via the drive unit 25 to adjust the opening amount. Can be adjusted. As described above, the same effect as that of the first embodiment can be obtained even with the configuration according to the modified example.

Further, in the second embodiment, each of the first to fourth plug members 241A to 241D may be divided into a plurality of parts. In that case, the divided plug members can be removed one by one so that the opening amount is determined based on the detection result of the detection unit 26. This makes it possible to finely adjust the opening amount.

Further, in the first embodiment and the second embodiment, the opening 8 may be provided in the middle of the path 4.

Further, in the first embodiment and the second embodiment, an example in which the activated sludge treatment tank 11 and the membrane separation tank 21 are separately provided is shown, but the membrane separation tank 21 is contained in the activated sludge treatment tank 11. May be provided. In that case, since the siphon type air diffuser of one aspect of the present invention has both the ability to clean the membrane surface and the ability to supply oxygen to the sludge-containing treated water, the output of the air diffuser 14 can be reduced or the air diffuser 14 can be used. It can be omitted. Therefore, a more energy-saving water treatment method can be used.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. The various shapes and combinations of the constituent members shown in the above-mentioned examples are examples, and can be variously changed based on design requirements and the like within a range that does not deviate from the gist of the present invention.

Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited to these Examples.

<Evaluation 1 (Measurement of average intermittent time)>
[Examples 1 to 4]
A siphon type air diffuser having a siphon chamber having a volume of 296.7 ml and an opening having a flat area of 400 mm ² when fully opened was immersed in a water tank. Next, 6 L / min of air was continuously supplied to the siphon chamber through the air supply port. The intermittent time of the siphon type air diffuser at each opening shown in Table 1 was measured. The value obtained by averaging the values measured 10 times was defined as the average intermittent time. The results are shown in Table 1.

<Evaluation 2 (Measurement of average volume of bubbles)>
In evaluation 1, the released air bubbles were collected by a graduated cylinder having a capacity of 1 L, and the volume was read. The average value of the measured values 5 to 7 times was taken as the average volume of the bubbles. FIG. 8 is a graph showing the result of evaluation 2. The detailed results of evaluation 2 are shown in Table 2.

As is clear from Table 1, the intermittent time became shorter as the opening amount was increased. Further, as is clear from Table 2 and FIG. 8, the size (average volume) of the bubbles became smaller as the opening amount was increased.

Looking at the ratio of the average volume of bubbles to the volume of the siphon chamber, in Examples 1 to 3, the average volume of bubbles was smaller than the volume of the siphon chamber. It is presumed that this is because the volume of air (air bubbles) released from the air diffuser hole decreased as a result of some air being pushed back into the siphon chamber by the inflow of water from the opening.

In the fourth embodiment, the average volume of the bubbles is larger than the volume of the siphon chamber, but the air is continuously supplied even while the air stored in the siphon chamber is moving to the air diffuser hole. Therefore, it is presumed that the volume was larger than the volume of the siphon room.

As described above, it has been shown that in the siphon type air diffuser of one aspect of the present invention, the size of bubbles and the intermittent time can be adjusted by adjusting the opening amount of the opening.

From the above, it was shown that the present invention is useful.

1,101 ... Siphon type air diffuser, 2 ... Siphon room, 2A ... First siphon room, 2B ... Second siphon room, 4 ... Path, 4a ... First partition wall, 4b ... Second partition wall, 5 ... Communication section , 6 ... air diffuser hole, 8,81 ... opening, 14a ... air diffuser tube, 22 ... membrane module, 23, 23A, 231 ... adjustment mechanism, 24, 27 ... lid member, 25 ... drive unit, 26 ... detection unit, 28 ... Control unit, 81A ... First opening, 81B ... Second opening, 100 ... Membrane separation active sludge device, 241A ... First plug member, 241B ... Second plug member, A, A1, A2 ... Air, B ... Sludge-containing treated water

Claims (6)

A membrane separation activated sludge device equipped with a membrane module for membrane separation of sludge-containing treated water containing activated sludge and a siphon type air diffuser for intermittent aeration.
The siphon type air diffuser
A siphon room including a first siphon room and a second siphon room for storing air,
The communication unit communicating with the first siphon room and the second siphon room,
An air diffuser hole provided downstream of the siphon chamber and
An air supply means for supplying the air to the siphon chamber and
Wherein among paths leading to the air diffuser holes from the siphon chamber, Ru and an adjusting mechanism capable of adjusting the opening amount of the opening formed in the siphon chamber and the not facing the communicating portion, membrane bioreactor apparatus. The adjusting mechanism includes a lid member that closes the opening and
The membrane separation activated sludge device according to claim 1, further comprising a driving unit for driving the lid member. The opening includes a first opening and a second opening.
The membrane separation activity according to claim 1, wherein the adjusting mechanism includes a first plug member that can be attached to and detached from the first opening, and a second plug member that can be attached to and detached from the second opening. Sludge device . A detection unit that detects at least one of the intermembrane differential pressure in the membrane module and the dissolved oxygen concentration of the sludge-containing treated water.
The membrane separation activated sludge device according to claim 2 , further comprising a control unit that determines the opening amount based on the detection result of the detection unit and controls the drive unit. A detection unit that detects at least one of the intermembrane differential pressure in the membrane module and the dissolved oxygen concentration of the sludge-containing treated water.
The membrane separation activated sludge apparatus according to claim 3 , further comprising a notification means for determining and notifying the opening amount based on the detection result of the detection unit. Activated sludge treatment process that treats raw water with activated sludge using activated sludge,
It has a membrane separation step of separating the sludge-containing treated water obtained in the activated sludge treatment step by a membrane separation treatment.
The water treatment method using the membrane separation activated sludge apparatus according to any one of claims 1 to 5 in the membrane separation step.

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