JP2019076857A - Siphon type diffuser, membrane separation active sludge apparatus and water treatment method - Google Patents

Abstract

To provide a siphon type diffuser, a membrane separation active sludge apparatus and a water treatment method capable of stably suppressing the clogging in a diffuser pipe.SOLUTION: A siphon type diffuser 10 includes a siphon type diffuser pipe 1 and a rotation mechanism 60. Therein, a siphon chamber is formed on an inner part of the siphon type diffuser pipe 1, a treatment water inflow port located on the upstream of the siphon chamber is formed on a lower part of the siphon type diffuser pipe 1, a diffusion hole located on the downstream of the siphon chamber is formed on an upper part of the siphon type diffuser pipe 1, and the rotation mechanism 60 is a mechanism which rotates the siphon type diffuser pipe 1 such that the top and bottom of the siphon type diffuser pipe 1 are reversed, and performs aeration intermittently.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a siphon type aeration apparatus, a membrane separation activated sludge apparatus and a water treatment method.

  Industrial wastewater and domestic wastewater are treated to remove organic matter and the like contained in the wastewater, and then reused as industrial water or discharged to rivers and the like. Examples of methods for treating industrial wastewater include an activated sludge method. The activated sludge method is a method of aeration to cause aerobic microorganisms to decompose organic matter and the like.

  Moreover, in recent years, the treatment by the membrane separation activated sludge (MBR) method which combined the treatment by the activated sludge method and the membrane filtration by a membrane module has come to be performed. In the treatment by the MBR method, as the organic membrane and the like are deposited on the surface of the separation membrane as the membrane filtration is continued, the filtration flow rate may decrease and the transmembrane differential pressure may increase. Therefore, a diffuser is provided below the membrane module for the purpose of efficiently removing the sludge deposited on the membrane surface. Air bubbles blown out from the air diffusion tube rise due to the density difference with the liquid to be treated, and the membrane itself vibrates due to the impact when the air bubbles contact the membrane surface or the water flow accompanying the generation of the bubbles, and organic matter etc. on the membrane surface Deposition is suppressed.

  Since the shear stress applied to the film by the bubbles is proportional to the bubble floating speed, it is necessary to increase the bubble floating speed to enhance the cleaning effect of the film surface. On the other hand, energy consumption increases to increase the floating speed of the bubbles. Therefore, in recent years, siphon-type aeration pipes that can intermittently eject large bubbles using the siphon principle have attracted attention. However, in the siphon aeration pipe, the water level constantly fluctuates in the pipe, and inflow and discharge of sludge are repeated. Therefore, the sludge in the pipe is easily deposited and solidified in a dried state, the removal of the sludge becomes difficult, the deposition of the sludge progresses, and the air diffusion pipe is easily clogged.

  As a siphon type aeration pipe that suppresses clogging by sludge, a gas is injected from a gas injection point located at a position below the liquid level in the pipe during operation, and the liquid in the pipe is injected upward by the gas and injected. The siphon type aeration pipe which crushes sludge with the liquid which has been proposed is proposed (patent documents 1). In addition, a siphon-type aeration tube has also been proposed in which air can be periodically removed from a portion where air is accumulated during operation of the aeration tube (Patent Document 1).

Japanese Patent Publication No. 2010-528833

  However, in the method of injecting the liquid upward in the pipe, the sludge is also spattered along with the injection, so the spattered sludge adheres to the upper part of the portion where air in the pipe is accumulated and tends to dry, and the sludge deposition is reversed. There is a risk of promoting In addition, the method of periodically removing air has the effect of suppressing the drying of the sludge in the pipe, but it is difficult to remove the sludge that has already dried and solidified, and it is sufficient that the sludge deposition proceeds It can not be suppressed.

  The present invention has been made in view of such circumstances, and it is desirable to provide a siphon type aeration apparatus, a membrane separation activated sludge apparatus, and a water treatment method capable of stably suppressing clogging in the aeration tube. To aim.

The present invention has the following aspects.
[1] A siphon type aeration apparatus that intermittently aerates, and
It has a siphon aeration tube and a rotation mechanism,
A siphon chamber is formed in the interior of the siphon type aeration tube, a treated water inlet located upstream of the siphon chamber is formed in the lower portion of the siphon type aeration tube, and a siphon chamber of the siphon chamber is formed in the upper portion of the siphon type aeration tube. A diffuser hole located downstream is formed.
The siphon type aeration apparatus, wherein the rotation mechanism is a mechanism that rotates the siphon type aeration pipe such that the top and bottom of the siphon type aeration pipe are reversed.
[2] [1] The siphon type aeration apparatus as described in [1],
A membrane module for membrane separation of sludge containing treated water including activated sludge;
A membrane separation activated sludge device, comprising: a membrane separation tank in which the siphon type aeration pipe and the membrane module are installed.
[3] Activated sludge treatment of raw water using activated sludge,
A water treatment method, wherein the activated sludge-treated sludge-containing treated water is subjected to membrane separation treatment by the membrane separation activated sludge apparatus according to [2].

By using the siphon type aeration pipe and the membrane separation activated sludge apparatus of the present invention, clogging inside the aeration pipe can be stably suppressed.
According to the water treatment method of the present invention, clogging in the siphon type aeration tube can be stably suppressed, and water treatment can be performed stably.

It is the schematic diagram which showed an example of the water treatment apparatus used for the water treatment method of this invention. It is the perspective view which showed an example of the siphon type aeration pipe in this invention. It is II sectional drawing of the siphon type aeration pipe of FIG. It is sectional drawing explaining the operating mechanism of the normal state of a siphon type air diffuser. It is sectional drawing which showed a mode that the siphon type aeration tube was upside down. It is sectional drawing explaining the action | operation mechanism of the state which up-down inverted the siphon type aeration pipe.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. Note that the dimensions and the like of the drawings illustrated in the following description are merely examples, and the present invention is not necessarily limited to them, and can be appropriately modified and implemented without changing the gist of the invention. .
The "vertical direction" and the "lateral direction" in the present specification mean the vertical direction and the lateral direction in a state in which the upper wall of the casing of the siphon type aeration tube is the upper side and the lower wall is the lower side.

[Water treatment equipment]
FIG. 1: is the schematic diagram which showed the water treatment apparatus 1000 which is an example of the water treatment apparatus used for the water treatment method of this invention. As shown in FIG. 1, the water treatment apparatus 1000 may be referred to as an activated sludge treatment tank 11 and a membrane separation activated sludge apparatus 100 (hereinafter, referred to as “MBR apparatus 100” provided at a stage subsequent to the activated sludge treatment tank 11. And the processing water tank 41 provided at the rear stage of the MBR device 100. Furthermore, although not shown, the water treatment apparatus 1000 is a flow rate adjustment tank that adjusts the flow rate of the raw water flowing into the activated sludge treatment tank 11, a withdrawal pump that pulls excess sludge from the MBR device 100, a chemical solution and the MBR device 100 It includes a liquid feeding means for feeding dilution water, and a discharge means for discharging treated water from a treatment water tank 41 to a factory or a river.

The activated sludge treatment tank 11 is for filling activated sludge in order to perform activated sludge treatment.
A first flow passage 12 and a second flow passage 13 are connected to the activated sludge treatment tank 11. The first flow path 12 is a flow path for causing raw water discharged from a factory or a home to flow into the activated sludge treatment tank 11. The second flow path 13 is a flow path for causing the sludge-containing treated water (treated water) discharged from the activated sludge treatment tank 11 to flow into the MBR device 100.

A diffuser 14 is installed in the activated sludge treatment tank 11 to maintain the inside of the tank under aerobic conditions.
The air diffuser 14 includes a diffuser 14a for diffusing air into the activated sludge treatment tank 11, an introduction pipe 14b for supplying the air to the diffuser 14a, and a blower 14c for supplying the air.
The air diffuser 14a is not particularly limited as long as the air supplied from the blower 14c can be discharged upward, and examples thereof include a perforated single pipe and a membrane type.

  The treatment water tank 41 stores treated water after membrane separation of the sludge-containing treated water.

(Membrane separation activated sludge device)
The MBR apparatus 100 includes a membrane separation tank 21, a membrane module 22, and a siphon type diffuser 10 provided below the membrane module 22. The second flow path 13 is connected to the membrane separation tank 21. The membrane module 22 and the siphon type aeration device 10 are disposed in the membrane separation tank 21.

  The membrane separation tank 21 is for storing the sludge-containing treated water including the activated sludge and the biological treated water, which has been sent from the activated sludge treatment tank 11.

A sludge return means 30 is connected to the membrane separation tank 21 and the activated sludge treatment tank 11. The sludge return means 30 is for returning part of the sludge-containing treated water from the membrane separation tank 21 to the activated sludge treatment tank 11.
The sludge return means 30 includes a fourth flow path 31. The fourth flow path 31 is a flow path that discharges a part of the sludge-containing treated water from the membrane separation tank 21 and causes the activated sludge treatment tank 11 to flow.
A pump 31 a is installed in the fourth flow path 31. Thereby, 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.

  The membrane module 22 is for membrane separation of sludge-containing treated water containing activated sludge. The membrane module 22 includes a separation membrane, and the separation membrane separates the sludge-containing treated water into biological treated water and activated sludge (solid-liquid separation (membrane separation)).

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

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

  The average pore diameter of the micropores formed in the separation membrane is about 0.001 to 0.1 μm in a membrane generally called ultrafiltration membrane, and about 0.1 to 1 μm in a membrane generally referred to as a precision separation membrane . In the present embodiment, it is preferable to use a separation membrane having an average pore diameter within the above range.

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

(Siphon air diffuser)
The siphon type aeration device 10 includes a siphon type aeration tube 1, a rotation mechanism 60, and an air supply means 70.

The siphon type aeration pipe 1 is provided with the housing | casing 50 and the 1st partition wall 4a and the 2nd partition wall 4b which partition the space in the housing | casing 50, as shown to FIG.2 and FIG.3.
The casing 50 is a cube provided with an upper wall 1A, which is a plate-like member having a rectangular shape in a front view, four side walls 1B, and a bottom wall 1C, so that a space is formed therein. Box-shaped housing.

The four side walls 1B are provided to form a square cylinder. An upper wall 1A is provided on the upper end side of a square tube formed of four side walls 1B. In a portion near one side wall 1B on the upper wall 1A side of the housing 50, an air diffusion hole 6 extending along the side wall 1B is formed.
The bottom wall 1C is provided to extend inward from the lower end side of the side wall 1B on the side where the aeration holes 6 are formed. A portion not closed by the bottom wall 1 </ b> C in the lower opening of the housing 50 is the treated water inlet 7.

The first partition wall 4a extends downward from the lower surface of the upper wall 1A of the casing 50 on the air diffusion hole 6 side, with the side wall 1B facing each other with the air diffusion hole 6 therebetween, and the first partition wall lower end 4a ₁ of 4a are provided so as to be separated from the bottom wall 1C of the housing 50.
The second partition 4 b is provided to extend upward from the top surface of the tip of the bottom wall 1 C of the housing 50 opposite to the aeration hole 6 of the first partition 4 a. The upper end 4 b ₁ of the second partition 4 b is separated from the upper wall _{1 A} of the housing 50. The first partition wall 4a and the second partition wall 4b are provided at an interval such that the surfaces thereof face each other.

In the siphon type aeration pipe 1, the treated water inlet 7 is disposed on the opposite side to the first partition 4a of the second partition 4b in the lower part of the housing 50, and the first of the first partition 4a in the upper part of the housing 50 An air diffusion hole 6 is disposed on the opposite side to the second partition wall 4b.
In the case 50, when the flow of treated water from the treated water inlet 7 toward the aeration hole 6 is assumed, the treated water inlet 7 side is "upstream" and the aeration hole 6 side is "downstream".

In tracheal 1 diffuser siphon, in the process water inlet 7 side than the first partition wall 4a of the housing 50, the space from the upper end 4b ₁ of the second partition wall 4b to the lower end 4a ₁ of the first partition wall 4a siphon It becomes room 2. The siphon chamber 2 stores air. The siphon chamber 2 is divided into a first siphon chamber 2A and a second siphon chamber 2B by a second partition 4b.

The first siphon chamber 2A and the second siphon chamber 2B communicate with each other at the communication portion 5 above them. A portion from the second siphon chamber 2 </ b> B in the housing 50 to the aeration hole 6 is a path 4. A portion of the first partition wall 4 a faces the siphon chamber 2 and the path 4. In other words, part of the first partition wall 4 a partitions the siphon chamber 2 and the path 4. Further, a part of the second partition wall 4 b faces the siphon chamber 2. The upper end 4b ₁ of the second partition wall 4b is positioned above the lower end 4a ₁ of at least a first partition wall 4a. Process water inlet 7 is formed in the bottom of the housing 50 is positioned below the lower end 4a ₁ of the first partition wall 4a.

  Thus, inside the housing 50, the first siphon chamber 2A, the communication unit 5, the second siphon chamber 2B, and the path 4 are formed in this order from upstream to downstream. Then, an air diffusion hole 6 is formed downstream of the siphon chamber 2 in the housing 50, and a treated water inlet 7 is formed upstream of the siphon chamber 2. The treated water inlet 7 communicates the outside of the siphon type aeration tube 1 with the siphon chamber 2.

The plan view shape of the air diffusion hole 6 is a long rectangular shape. The area of the plan view shape of the aeration holes 6 is preferably 25 cm ² or less, more preferably 20 cm ² or less. Further, the length in the longitudinal direction of the plan view shape is preferably 25 cm or less, more preferably 20 cm or less.

The siphon type aeration tube 1 is provided at a position where the adjacent air separation membranes in the membrane module 22 overlap the air diffusion holes 6 when the membrane separation tank 21 is viewed in plan.
The number of the siphon type aeration pipes 1 is not particularly limited, and can be appropriately set according to the size and the number of the membrane modules 22.

  The rotation mechanism 60 is a mechanism which rotates the siphon type aeration tube 1 so that the upper and lower sides of the siphon type aeration tube 1 may be reversed, as shown in FIG. The mode of the rotation mechanism 60 is not particularly limited as long as it is a mechanism that can rotate the siphon-type aeration tube 1 so as to turn it upside down.

The rotation mechanism 60 may be any mechanism capable of rotating the siphon-type aeration tube 1 at least 180 ° with the lateral direction as the rotation axis, and even a mechanism capable of rotating the siphon-type aeration tube 1 in the range of more than 180 ° and 360 ° or less Good.
The rotation axis of the siphon type aeration pipe 1 by the rotation mechanism 60 may be a rotation axis p in the lateral direction along the surfaces of the first partition wall 4a and the second partition wall 4b, as shown in FIG. It may be a rotational axis q in the lateral direction intersecting the surface of the partition wall 4a or the second partition wall 4b.

The air supply means 70 includes a blower 72 and an air supply pipe 74, as shown in FIG.
The air supply pipe 74 is disposed such that one end is connected to the blower 72 and the other end extends below the opening at the lower end of the cylindrical portion formed of the four side walls 1B. An opening is formed in a portion located below the opening of the lower end of the cylindrical portion formed by the four side walls 1B in the air supply pipe 74.

  The air supply means 70 supplies air blown out from the opening of the air supply pipe 74 from the treated water inlet 7 to the siphon chamber 2 in the housing 50 for the normal state siphon type aeration tube 1 which is not upside down. It comes to supply. Further, the air supply means 70 supplies the air blown out from the opening of the air supply pipe 74 from the air diffusion hole 6 to the inside of the casing 50 to the siphon type aeration pipe 1 in a state of being turned upside down. There is.

Hereinafter, the operation mechanism of the siphon type aeration pipe 1 will be described.
When cleaning the membrane surface of the membrane module 22, as shown in FIGS. 2 and 3, the siphon type aeration tube 1 is the upper wall 1A of the housing 50 at the upper side and the lower wall 1C at the lower side, that is, aeration The hole 6 is used on the upper side and the treated water inlet 7 is used on the lower side.
Before the start of operation, as shown in FIG. 4 (a), the siphon chamber 2, the communication part 5 and the passage 4 in the casing 50 of the siphon type aeration tube 1 are filled with the sludge-containing treated water B (water to be treated) It is done. Air B is continuously supplied from the treated water inlet 7 to the siphon chamber 2 in the housing 50 through the air supply pipe 74 by the blower 72. When the air A is continuously supplied, as shown in FIG. 4 (b), the sludge-containing treated water B in the siphon chamber 2 is pushed out from the aeration holes 6 and the treated water inlet 7, and the liquid surface S of the siphon chamber 2 Will gradually descend.

Further continue to supply air A, the height of the liquid surface S is lower than the lower end 4a ₁ of the first partition wall 4a, as shown in FIG. 4 (c), the path 4 and the first siphon chamber 2A Due to the difference between the two air-liquid interface heights, the air A moves to the path 4 and is expelled from the aeration holes 6 at once to form the bubbles 20. When the air is aspirated from the aeration holes 6, as shown in FIG. 4A, the siphon chamber 2, the communicating portion 5 and the passage 4 in the casing 50 of the siphon type aeration tube 1 are filled with the sludge-containing treated water B. Return to the state they were And by the state of FIG. 4 (a)-(c) being performed repeatedly, the bubble of large size is aerated intermittently. Thus, the membrane surface of the membrane module 22 can be efficiently cleaned by the air bubbles of a large size which is intermittently aerated.

When removing the sludge deposited in the housing 50, the rotation mechanism 60 vertically flips the siphon type aeration tube 1 as shown in FIG. In such a reversed siphon type aeration pipe 1, the treated water inlet 7 directed upward functions as a diffuser hole, and the downwardly directed diffuser hole 6 functions as a treated water inlet. Further, in Chikiana 6 side than the second partition wall 4b of the housing 50, the space from the upper end 4b ₁ of the second partition wall 4b to the lower end 4a ₁ of the first partition wall 4a is siphon chamber 8.

In the inverted siphon type aeration pipe 1, as shown in FIG. 6A, the inside of the housing 50 is filled with the sludge-containing treated water B before operation. When air A is continuously supplied to the siphon chamber 8 in the housing 50 from the aeration hole 6 via the air supply pipe 74 by the blower 72, as shown in FIG. 6 (b), the sludge containing in the siphon chamber 8 The treated water B is pushed out from the aeration holes 6 and the treated water inlet 7, and the liquid level S of the siphon chamber 8 gradually descends. Further continue to supply air A, becomes lower than the upper end 4b ₁ of the second partition wall 4b of the liquid level S is inverted, as shown in FIG. 6 (c), the process water inlet which serves as a Chikiana It is released at once from 7 to form a bubble 20. After the aeration, as shown in FIG. 6A, the inside of the casing 50 of the siphon type aeration tube 1 returns to the state of being filled with the sludge-containing treated water B. And aeration is intermittently performed by the state of Fig.6 (a)-(c) being performed repeatedly.

  In the normal state siphon type aeration tube 1 which is not upside down, the passage 4 is in contact with the sludge-containing treated water B for a long time, and it is in contact with air only for a short time of aeration; Because it is also fast, the chance of occlusion is low. On the other hand, the portion of the housing 50 facing the communication portion 5 on the upper side of the siphon chamber 2 has a long time in contact with air at the time of operation, and when sludge adheres, it dries and accumulates and easily solidifies. Further, the flow passage is narrowed from the communication part 5 to the second siphon chamber 2B and the passage 4, and in the normal state, the sludge having the air A and the sludge-containing treated water B flows in the direction to push the deposited sludge into the narrow flow passage. , Tend to clog.

On the other hand, in the inverted siphon type aeration pipe 1, the portion of the housing 50 facing the communicating portion 5 is longer in time filled with the sludge-containing treated water B, and therefore, deposits in that portion in the normal state The time for which the sludge is in contact with the sludge-containing treated water B is long. Therefore, even if the deposited sludge is dry, it tends to be in a sufficiently wet state. Also, the flow path extends from the siphon chamber 8 to the treated water inlet 7 functioning as the aeration hole, and in the reverse state, in a direction to push the sludge on which the air A and the sludge-containing treated water B have accumulated into the spread flow path. Because it flows, sludge that has been deposited is likely to be discharged. In addition, even when the sludge separated from the portion facing the communicating portion 5 in the housing 50 is not sufficiently pushed out in the reverse state, when the siphon type aeration pipe 1 is rotated to return to the normal state again The collected sludge falls by its own weight and is discharged from the treated water inlet 7 to the outside of the pipe.
Thus, in the siphon type aeration device 10, the siphon type aeration tube 1 is efficiently removed by turning up the siphon type aeration tube 1 by the rotation mechanism 60 up and down, and the siphon type aeration tube 1 is clogged. Can be suppressed.

  Further, the volume of the siphon chamber 8 of the inverted siphon type aeration tube 1 is smaller than the volume of the siphon chamber 2 of the normal siphon aeration tube 1. As a result, in the reverse state, the size of the bubble to be aerated is smaller than that in the normal state, and the intermittence time becomes short. Therefore, the oxygen dissolution efficiency of the aerated air bubbles is increased, and the inside of the membrane separation tank 21 can be easily made into an appropriate aerobic condition.

[Water treatment method]
Hereinafter, a water treatment method using the water treatment apparatus 1000 will be described. The water treatment method of the present embodiment has an activated sludge treatment step of treating raw water with activated sludge using activated sludge, and a membrane separation step of subjecting the sludge-containing treated water obtained in the activated sludge treatment step to membrane separation. ing.

  In the water treatment method by the water treatment apparatus 1000, waste water (raw water) such as industrial waste water and household waste water discharged from factories and homes flows into the activated sludge treatment tank 11 through the first flow path 12 in the activated sludge treatment process. And treated with activated sludge in activated sludge treatment tank 11 to obtain biologically treated water. The sludge-containing treated water (treated water) after the activated sludge treatment flows into the membrane separation tank 21 of the MBR device 100 through the second flow path 13.

In the membrane separation step, in the membrane separation tank 21 of the MBR device 100, the membrane module 22 performs a membrane separation process on sludge-containing treated water (water to be treated) including activated sludge and biological treated water. During the membrane separation process, aeration is performed by the siphon type aeration device 10.
For example, when an organic substance or the like is deposited on the surface of the separation membrane of the membrane module 22 and the inter-membrane differential pressure of the membrane module 22 becomes large, the siphon type aeration tube 1 is set to a normal state not to turn upside down Aeration. Thereby, the cleaning effect of the membrane surface of membrane module 22 becomes high.

  When the sludge is deposited in the casing 50 of the siphon type aeration tube 1, the siphon type aeration tube 1 is turned upside down by the rotation mechanism 60 to perform aeration, and the siphon type aeration tube 1 is returned to the normal state again. Thereby, the sludge deposited in the housing | casing 50 can be removed efficiently. In addition, when the siphon type aeration tube 1 is in the reverse state, the size of the aerated air bubbles is small and the oxygen dissolution efficiency is high. Therefore, even when the dissolved oxygen concentration of the sludge-containing treated water is low, the siphon type dispersion is The inside of the membrane separation tank 21 can be easily made into an appropriate aerobic condition by performing aeration by inverting the trachea 1 up and down.

  A part of the sludge-containing treated water B is returned from the membrane separation tank 21 to the activated sludge treatment tank 11 by the sludge return means 30. The treated water after membrane separation of the sludge-containing treated water B by the membrane module 22 is sent to the treated water tank 41 through the third flow path 33 and stored. The treated water stored in the treated water tank 41 can be reused as industrial water or discharged to a river or the like.

  As described above, in the present invention, the sludge accumulated in the casing can be efficiently removed by vertically inverting the siphon type aeration pipe, so that clogging in the aeration pipe can be stably suppressed. In addition, whether to give priority to, for example, suppressing the deposition of organic matter on the separation membrane surface of the membrane module by turning the siphon aeration pipe upside down, or to give priority to making the inside of the tank an appropriate aerobic condition Depending on the circumstances such as the above, it is possible to perform water treatment by adjusting the bubble size and the intermittent time.

In addition, the siphon type aeration pipe of this invention is not limited to the above-mentioned siphon type aeration pipe 1.
The membrane separation activated sludge apparatus of the present invention comprises the siphon aeration pipe of the present invention, a membrane module for membrane separation of sludge-containing treated water containing activated sludge, and a membrane separation tank in which the siphon aeration pipe and the membrane module are installed. And the known aspect can be adopted except that
The water treatment method of the present invention may be a method of simultaneously performing the activated sludge treatment step and the membrane separation step using a water treatment apparatus in which the MBR device 100 is provided in the activated sludge treatment tank 11.

DESCRIPTION OF SYMBOLS 1 ... siphon type aeration pipe, 1A ... top wall, 1B ... side wall, 1C ... bottom wall, 2, 8 ... siphon room, 2A ... 1st siphon room, 2B ... 2nd siphon room, 4 ... path, 4a ... 1st Partition wall 4a ₁ lower end 4b second partition wall 4b ₁ upper end 5 communication portion 6 aeration hole 7 treated water inlet 11 activated sludge treatment tank 21 membrane separation tank 22: membrane module, 41: treated water tank, 50: housing, 60: rotation mechanism, 70: air supply means, 72: blower, 74: air supply pipe, 100: membrane separation activated sludge device, 1000: water treatment device.

Claims (3)

It is a siphon type aeration device that performs aeration intermittently.
It has a siphon aeration tube and a rotation mechanism,
A siphon chamber is formed in the interior of the siphon type aeration tube, a treated water inlet located upstream of the siphon chamber is formed in the lower portion of the siphon type aeration tube, and a siphon chamber of the siphon chamber is formed in the upper portion of the siphon type aeration tube. A diffuser hole located downstream is formed.
The siphon type aeration apparatus, wherein the rotation mechanism is a mechanism that rotates the siphon type aeration pipe such that the top and bottom of the siphon type aeration pipe are reversed. A siphon type aeration apparatus according to claim 1;
A membrane module for membrane separation of sludge containing treated water including activated sludge;
A membrane separation activated sludge device, comprising: a membrane separation tank in which the siphon type aeration pipe and the membrane module are installed. Activated sludge treatment of raw water using activated sludge,
The water treatment method which carries out the membrane separation process of the sludge containing treated water which carried out the activated sludge process by the membrane separation activated sludge apparatus according to claim 2.

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