JPH09262582A - Membrane aspiration apparatus of water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase suction force using a small size pump and improve the treatment power of a water treatment apparatus comprising a membrane unit using ultrafiltration membranes in a treatment tank by connecting an air-tightly held box body with a suction pipe route and forming water outlet equipped with a water discharge valve in a way the valve is opened and closed freely. SOLUTION: A membrane unit 3 is immersed in a treatment tank 2 to which rain water and polluted water flow through a pipeline 1 and a suction inlet 30 in the upper part is communicated with air-tight box body 7 through a suction pipe route 5. In the box body 7, a connection aperture 70 to be connected with the suction pipe route 5 and a connection aperture 71 to be connected with an air intake pipe 80 are formed in the upper face side an a water discharge outlet 72 is opened in the lower part and a water discharge valve 9 which is opened when the liquid level of a permeating liquid to be stored in the box body 7 reaches a prescribed level is installed in the water discharge outlet 72. The inside of the box body 72 is kept at negative pressure corresponding to the deaerating power of a vacuum pump P and high suction force is applied to the membrane inner face side of the membrane unit 3, so that the treatment power of the membrane aspiration apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment in which a submerged membrane unit is used, and suction pressure is applied to the membrane unit to extract a permeated liquid from water, rainwater, sewage, etc. to perform solid-liquid separation. The present invention relates to an improvement of the membrane suction device of the device.

[0002]

2. Description of the Related Art Membrane suction devices in water treatment devices that use a submerged membrane unit to separate solid-liquid separation by sucking out permeated liquid from liquids such as rainwater and dirty water have been As shown in FIG. 1, the pipe 1 of the water treatment device
The membrane unit 3 assembled with an ultrafiltration membrane is placed in the inflow water in the treatment tank 2 in which the rainwater and inflow water introduced via the
As many as required are installed in parallel and combined, and the suction ports 30 are provided at their upper ends so as to communicate with the inner surface side of the ultrafiltration membrane. The suction pipe line 5 communicating with the water intake port 40 of the water pump 4 to be installed is connected, and the water discharge pipe 6 is connected to the water discharge port 41 of the pump 4. A suction pressure is applied to the inner surface of the membrane of the unit 3 to obtain a permeate, which is pumped out by a water pump 4 to perform solid-liquid separation.

[0003]

As described above, the membrane suction device in the water treatment device using the immersion type membrane unit 3 has a treatment capacity for extracting the permeated liquid from the inner surface of the membrane of the membrane unit 3 and separating it into solid and liquid. , The water pump 4 to be used because it depends on the level of suction pressure applied to the inner surface side of the membrane.
Is desired to have a high suction pressure.

However, the water pump 4 having a high suction pressure is small in size except for the large size, and is particularly suitable for a small size water treatment device which obtains, for example, about 1 cubic meter of treated water per day. As for small water pumps, there are few commercial products, and most of them have low suction pressure, which is a bottleneck in obtaining a small water treatment device with high treatment capacity. .

Further, the water pump 4 generally has a low suction pressure, and it is difficult to raise the suction pressure. Further, there is a problem in that it is inconvenient to handle when it is used. have.

According to the present invention, these problems occurring in the conventional means are solved, and the suction pressure acting on the membrane unit 3 is increased while using a small, lightweight and inexpensive pump, thereby improving the processing capacity. It is an object of the present invention to provide a new means that can be obtained and facilitates handling without requiring priming water.

[0007]

In the present invention, as a means for achieving the above-mentioned object, an immersion type membrane unit 3 using an ultrafiltration membrane is installed in a treatment tank 2 and In a membrane suction device of a water treatment device in which a permeated liquid is filtered from water or a liquid in the treatment tank 2 by applying a suction pressure to the membrane unit 3 to perform solid-liquid separation, a suction pipe line 5 leading to the membrane unit 3 , The upper side of the box body 7 which is kept airtight is connected and communicated, and the upper side of the box body 7 is connected with an intake pipe 80 communicating with the intake port 81 of the vacuum pump P,
A drain outlet 72 is opened at the bottom of the box body 7, and the drain outlet 7
The membrane suction device of the water treatment device is characterized in that the drain valve 9 is provided on the drain opening 2 so as to be openable and closable.

[0008]

According to the means of the present invention configured as described above, the inside of the airtight box body 7 communicating with the suction port 30 of the membrane unit 3 through the suction pipe line 5 by the operation of the vacuum pump P is a vacuum pump. The permeated liquid is held at a negative pressure corresponding to the degassing capacity of P, efficiently permeates the ultrafiltration membrane of the membrane unit 3 at a high suction pressure, and is stored in the box body 7. When the water level reaches a predetermined level, the drain valve 9 opens to allow the water to be taken out from the drain port 72 at the bottom of the box 7.

Since the vacuum pump P can obtain a suction pump having a higher suction pressure at a lower cost than the water pump 4, a high suction pressure is applied to the inner surface of the membrane of the membrane unit 3 to cause the membrane to move. Improving the throughput of the suction device is cheaper to obtain. In addition, the vacuum pump P used does not require priming water, which facilitates handling.

[0010]

Next, an embodiment will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for components having the same effects as those of the conventional means.

FIG. 2 is an overall schematic view of a water treatment apparatus A for carrying out the present invention. In FIG. 2, 1 is a pipe for guiding inflow water, rainwater, sewage, etc., 2 is a process for storing the inflow water, etc. Tank,
3 is a membrane unit to be installed in the processing tank 2, 30 is a suction port provided on the upper portion thereof, 5 is a suction pipe line connected to the suction port 30, and 7 is a connection to the suction pipe line 5 on the upper side. An airtight box body communicating with the mouth 70, P is an intake port 81 via an intake pipe 80 to another connection port 71 provided on the upper part of the box body 7.
Is a vacuum pump communicating with each other, 72 is a drainage port provided in the lower portion of the box body 7, and 9 is a drainage valve provided in the drainage port 72.

The treatment tank 2 does not perform aeration particularly when the water flowing in and stored through the pipe 1 is rainwater, river water, groundwater, etc., but when the inflow water is sewage containing sludge Is an ordinary one that incorporates an aeration device to aerate and grow activated sludge.

The immersion type membrane unit 3 installed in the treatment tank 2 is assembled by using a membrane module formed by bundling hundreds of hollow fiber membranes made of ultrafiltration membranes or formed into a sheet. It is a conventionally known one in which outer filtration membranes are assembled in parallel in multiple layers, and is a normal one used as a mode of being immersed in inflow water stored in the treatment tank 2, and is a lumen side of a hollow fiber membrane or an ultrafine membrane. The suction port 30 communicating with the inner surface side of the filtration membrane is provided, and the permeated liquid is suctioned and taken out from the inner surface side of the ultrafiltration membrane by the suction pipe line 5 connected thereto.

The box 7 is formed in a box shape so as to keep the inside airtight and watertight, and the suction pipe line 5 communicating with the suction port 30 of the membrane unit 3 is connected to the upper surface side. And a connection port 71 for connecting an intake pipe 80 communicating with the intake port 81 of the vacuum pump P are provided, and the lower part of the box from the membrane unit 3 via the suction pipe line 5 is provided. A drainage port 72 for opening the permeated liquid that has flowed into and stored in the body 7 to the outside of the box body 7 is provided.

The drainage valve 9 installed in the drainage port 72 has a predetermined level in the box body 7 of the permeated liquid from the membrane unit 3 which flows into the box body 7 via the suction pipe line 5 and is stored therein. The valve is controlled to open and the drainage port 72 is opened when the level reaches.

In the embodiment shown in FIGS. 2 and 3, a drainage pipe 73 is provided on one side of the bottom portion of the box body 7 so as to project, and a drainage in the form of a cutting opening that is inclined downwardly at the protruding end thereof. A port 72 is formed, and the drain valve 9 formed in the shape of a lid plate that freely pivots up and down around the hinge 90 is abutted on the outer surface side of the port 72, and the drain port 72 is formed by the weight of the drain valve 9 itself. The water level of the permeated liquid stored in the box 7 rises and the water pressure due to the water level difference between it and the drain port 72 is applied to the valve closing side due to the weight of the drain valve 9. The valve is opened when the pressure becomes larger than the urging pressure, and thereafter, the valve is held in the opened state by the water force for discharging, and most of the permeated liquid stored in the box body 7 flows out to push the drain valve 9 open. Disappears, the valve returns to the closed state, and the inside of the box body 7 is kept airtight again.

The means for controlling the drain valve 9 to open when the water level of the permeate retained in the box 7 reaches a predetermined level is, as shown in FIG. The drainage port 72 is opened on the bottom surface, and the hinge 9 is provided on the top surface thereof.
The drainage valve 9 which rotates up and down by 0 to open and close is covered, one end side of the chain 91 is connected to the upper surface of the drainage valve 9, and separately in the box body 7 freely up and down around the fulcrum shaft 92 center. The float 94 supported on the tip of the rotating arm 93 is disposed, and the other end of the chain 91 is connected to the tip of the float 94 or the arm 93, so that the float is stored in the box 7. The drain valve 9 may be forcibly opened by the operation of raising the float 94 as the water level of the permeated liquid rises. Further, outside the drainage port 72 of the box body 7, there is provided a water guiding pipe 74 for guiding the permeated liquid discharged by opening the drainage valve 9 to a predetermined location.

Next, FIG. 5 shows still another embodiment. In this embodiment, the box body 7 in each of the above-mentioned embodiments is
This is an example in which it is installed outside the processing tank 2, while the space inside the processing tank 2 is used to be installed inside the processing tank 2.

In the treatment tank 2 in this example, the inflow water flowing in from the pipe 1 is sludge containing sludge, and in order to treat this, an aeration device a is installed at the bottom to grow activated sludge. There is.

Further, the processing tank 2 is formed as a closed type tank by enclosing the upper surface side with a partition wall 20 continuous to the surrounding machine wall, and the partition wall 20 enclosing the upper surface side is inspected for the inside. Manholes 21 and 22 for performing are provided, and they are closed by manhole covers 23 and 24 that can be freely attached and detached.

Then, in one corner of the upper part of the inner cavity of the processing tank 2, sewage flowing into the processing tank 2 from the pipe 1 and stored therein is controlled by a level sensor so as to be maintained at a predetermined water level. By utilizing the space portion formed above the level of the sewage, the surrounding wall 2a forms the empty chamber 2b into which the sewage does not flow, and the box body 7 formed airtight there.
Drainage port 7 which is built in and is formed at the bottom of the box 7.
An outlet 2c communicating with 2 is provided in the machine wall surrounding the treatment tank 2 so that the permeate stored in the box 7 can be taken out from here.

The box body 7 incorporated in the vacant chamber 2b is constructed in the same manner as the box body 7 used in the above-described embodiment shown in FIGS.

Further, the membrane unit 3 installed in the processing tank 2
And the suction port 30 of the box body 7 is connected to the connection port 70 of the box body 7 via the suction pipe line 5, and the connection port 71 of the box body 7 is connected to the intake pipe 80 leading to the intake port 81 of the vacuum pump P. In the same manner as in the above-described embodiment, the membrane unit 3 and the box body 7 are connected to each other through the suction pipe line 5 in the treatment tank 2. When the processing tank 2 is manufactured in a factory, most of the processing tank 2 except for the vacuum pump P can be assembled and set so that shipping and installation on the site can be rationalized.

[0024]

As described above, the membrane suction device in the water treatment device according to the present invention uses the vacuum pump P having a high suction pressure, and by its operation, the suction port 3 of the membrane unit 3 is operated.
0 and the inside of the airtight box 7 communicating with the suction pipe 5 are kept at a negative pressure corresponding to the deaeration capacity of the vacuum pump P, and the permeate of the ultrafiltration membrane of the membrane unit 3 is high. It is efficiently permeated by suction pressure and stored in the box body 7. When the water level of the permeated liquid reaches a predetermined level, the drain valve 9 is opened so that it is discharged from the drain port 72 to the outside. Therefore, an efficient membrane suction device can be obtained.

Since the vacuum pump P has a higher suction pressure than that of the water pump 4 and can be obtained at a low cost, a high suction pressure is applied to the inner surface of the membrane of the membrane unit 3 to cause the membrane suction device. It will be cheaper to improve the processing capacity of. Moreover, the vacuum pump P used does not require priming water, and thus is easy to handle.

Further, when the box body 7 is incorporated in the treatment tank 2, in the case of a small sewage treatment apparatus, the only equipment provided outside the treatment tank 2 is the vacuum pump P, and most equipment is installed. Since it is assembled in the processing tank 2, the processing tank 2
Most of the equipment except the vacuum pump P can be shipped as a pre-assembled set when molded in a factory with synthetic resin materials, etc., and construction for on-site installation is extremely easy. And will be able to.

[Brief description of drawings]

FIG. 1 is a schematic view of an entire membrane suction device in a conventional water treatment device.

FIG. 2 is a schematic diagram of an entire membrane suction device in a water treatment device for carrying out the present invention.

FIG. 3 is a vertical sectional front view of the main part of the above.

FIG. 4 is a vertical sectional front view of another embodiment of the main part of the above.

FIG. 5 is a vertical sectional front view of still another embodiment of the same.

[Explanation of symbols]

A ... Water treatment device, P ... Vacuum pump, a ... Aeration device, 1 ...
Piping, 2 ... Processing tank, 2a ... Enclosing wall, 2b ... Empty room, 2c ...
Outlet, 20 ... Partition, 21/22 ... Manhole, 23 ...
24 ... Manhole cover, 3 ... Membrane unit, 30 ... Suction port,
4 ... Water pump, 40/41 ... Water outlet, 5 ... Suction line, 6
... Water discharge pipe, 7 ... Box, 70/71 ... Connection port, 72 ... Discharge port, 73 ... Drain pipe, 74 ... Water guide pipe, 80 ... Intake pipe, 81
... Intake port, 9 ... Drain valve, 90 ... Hinge, 91 ... Chain, 92
... fulcrum shaft, 93 ... arm, 94 ... float.

Claims (3)

[Claims] 1. An immersion type membrane unit 3 using an ultrafiltration membrane is installed in a treatment tank 2 and suction pressure is applied to the membrane unit 3 to remove permeated liquid from water or liquid in the treatment tank 2. In a membrane suction device of a water treatment device for performing solid-liquid separation by filtration, the suction pipe line 5 communicating with the membrane unit 3 is connected to and communicates with the upper side of a box body 7 that is airtightly held, and the box body is connected. An intake pipe 80 communicating with an intake port 81 of the vacuum pump P is communicated with the upper side of 7, a drain port 72 is opened in the lower part of the box body 7, and a drain valve 9 is provided at the drain port 72 so as to be openable and closable. A membrane suction device for a water treatment device, characterized in that 2. A float 94 is vertically movable in a box body 7 whose upper side is in communication with a suction pipe line 5 communicating with the membrane unit 3 and an intake pipe 80 communicating with an intake port 81 of a vacuum pump P. The membrane suction device of the water treatment device according to claim 1, wherein the drain valve 9 provided at the drain port 72 in the lower portion of the box body 7 is controlled to be opened and closed by its ascending / descending operation. 3. A box body (7) for communicating the upper side with a suction pipe line (5) communicating with the membrane unit (3) and an intake pipe (80) communicating with an intake port (81) of a vacuum pump (P) is incorporated into the processing tank (2), and the box body (7) is assembled.
In addition, the intake port 81 of the vacuum pump P arranged outside the processing tank 2
The membrane suction device of the water treatment device according to claim 1, wherein