JPH091173A - Waste water treatment equipment - Google Patents

Abstract

PURPOSE: To realize a waste water treatment by a membrane separation with a convenient device constitution, to suppress the clogging of a membrane surface and to improve an operation stability. CONSTITUTION: In a waste water treating device provided with a membrane separation unit 7, the membrane separation unit 7 is provided with a discharging part 9 of the treated water to whose bottom end part a membrane module is connected and communicating to the outside of the device, a waste water introducing part 8 and a diffuser pipe disposed at a downward of the module and connected to an air supplying means 10. The membrane separation unit 7 is disposed at a position where the unit is immersed in the waste water 4 in a treating tank 1 in which a waste water treating part 2 is incorporated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wastewater treatment equipment. More specifically, the present invention relates to a wastewater treatment device that realizes wastewater treatment by membrane separation with a simple device configuration and that can prevent clogging of the membrane surface and that has excellent operational stability.

[0002]

2. Description of the Related Art As a method for treating organic wastewater containing organic components, various methods for decomposing and treating organic matter in water by utilizing microorganisms, such as an activated sludge method, have been widely used so far. However, on the other hand, regarding this biological treatment method using microorganisms, the treatment efficiency decreases due to fluctuations in the inflow load, and the outflow of SS (Suspended Solid) components (insoluble suspended solids) into the treated water occurs. It has been pointed out that the stability of water quality is impaired.

Further, when it is desired to obtain a clearer quality of treated water having an average BOD value of 10 mg / l or less, when the biological treatment method is applied alone, the apparatus becomes large and complicated, and it is realized. Was actually quite difficult.

[0004]

Therefore, in recent years, it has been proposed to apply a membrane separation technique to a biological treatment method in order to solve the above problems. The wastewater after microbial treatment is passed through a membrane, and pollutants are removed by this membrane before being discharged. However, in the wastewater treatment by membrane separation that has been proposed so far,
Since the permeate is obtained by passing the wastewater through the membrane, a driving force for moving the wastewater through the membrane is required.
A suction pump is used as this drive source, and the wastewater treatment device becomes large in size, and further, continuous suction by this suction pump causes problems such as clogging of the membrane surface.

The present invention has been made in view of the above circumstances, eliminates the drawbacks of the wastewater treatment by the conventional biological treatment method, and realizes the wastewater treatment by membrane separation with a simple device configuration, and An object of the present invention is to provide a wastewater treatment device which can prevent clogging of the membrane surface and has excellent operation stability.

[0006]

In order to solve the above-mentioned problems, the present invention is a wastewater treatment apparatus provided with a membrane separation unit, wherein the membrane separation unit has a membrane module connected to the lower end. The treated water discharge part that communicates with the outside, the drainage introduction part, and the diffuser pipe that is arranged below the membrane module and is connected to the air supply means, and the wastewater treatment part has a built-in wastewater treatment part. Disclosed is a wastewater treatment device, which is provided at a position where it is immersed in the.

[0007]

[Operation] In the wastewater treatment equipment of the present invention, as described above, the membrane module is connected to the lower end portion, and has the discharge portion of the treated water communicating with the outside of the equipment and the wastewater introduction portion. Further, the membrane separation unit provided with the air diffuser connected to the air supply means is provided in a position where it is immersed in the waste water in the treatment tank having the waste water treatment unit built therein.

Therefore, the driving force for drainage filtration by the membrane module can be provided only by supplying air into the membrane separation unit from a simple air supply means such as an air blower. Compared to using a conventional suction pump,
The device is downsized. Further, the surface of the membrane module is cleaned by the bubbles ejected from the air diffusing pipe arranged below the membrane module. Clogging of the membrane module is less likely to occur.

Then, the quality of the treated water is improved and becomes stable.

[0010]

Embodiments of the waste water treatment apparatus of the present invention will be described in more detail below with reference to the accompanying drawings. FIG.
FIG. 3 is a sectional view showing an embodiment of the wastewater treatment equipment of the present invention. For example, in the example shown in FIG. 1, a wastewater treatment unit (2) filled with a microorganism carrier for performing wastewater treatment is provided inside the treatment tank (1). The waste water (4) flows into the treatment tank (1) from the waste water introduction part (3). The wastewater treatment unit (2) is immersed in the wastewater (4), and in this state, the microbial carrier filled therein decomposes pollutant components such as organic components contained in the wastewater (4) to perform purification treatment. To do.

An air diffuser (6) connected to an air blower (5) is provided below the waste water treatment section (2),
Aeration treatment can be performed by the air supplied from the air blower (5). Further, in this example, a membrane separation unit (7) is also provided inside the processing tank (1). The membrane separation unit (7) filters the wastewater that has been purified by the wastewater treatment unit (2) to further remove pollutant components, and discharges the water with good and stable water quality.

The membrane separation unit (7) is arranged at a position where it is immersed in the waste water (4) when the waste water (4) flows into the treatment tank (1), like the waste water treatment section (2). Has been done. The bottom of the membrane separation unit (7) is provided with a wastewater introduction part (8) for introducing the wastewater purified by the wastewater treatment part (2) into the inside. A discharge part (9) for discharging the filtered treated water is provided in the upper part, and the discharge part (9) communicates with the outside of the apparatus.

Further, an air blower (10) is connected to the membrane separation unit (7) so that air can be supplied to the inside. For example, in the wastewater treatment device having the above-mentioned configuration, the microbial carrier filled therein in the wastewater treatment unit (2) decomposes pollutant components such as organic components contained in the wastewater (4), and then treats them. The waste water (4) can be passed through the membrane separation unit (7), filtered to a water quality that can be discharged to sewage, etc., and then discharged outside the apparatus.

In the example of FIG. 1, the overflow discharge part (11) is also provided above the processing tank (1). This is provided in the event that the waste water (4) flows in excess of the discharge amount of the treated water after the filtration treatment by the membrane separation unit (7). FIG. 2 is a cross-sectional view showing an example of the membrane separation unit. In the example of FIG. 2, a check valve (12) is provided in the middle of the flow path of the waste water introduction part (8), and the reverse flow of the waste water (4) from the membrane separation unit (7) to the treatment tank (1) direction. Is being prevented.

A membrane module (13) for filtering the wastewater (4) introduced therein is connected to the lower end of the discharge part (9). The structure of the membrane module (13) is not particularly limited, and for example, a hollow fiber membrane, a flat membrane or the like can be used as appropriate. The air blower (10) is
It is connected to the air diffuser (14). This air diffuser (14)
Are arranged below the membrane module (13) so that the generated bubbles come into contact with the lower surface of the membrane module (13).

For example, the membrane separation unit (7) having the above structure operates as follows. That is, since the membrane separation unit (7) is immersed in the wastewater (4) and placed under the water surface, the wastewater (4) treated by the wastewater treatment unit (2) shown in FIG. It flows into the inside of the membrane separation unit (7) through (12). When the inside of the membrane separation unit (7) is filled with the drainage water (4), the air blower (10) operates, and the membrane separation unit (7) passes through the air diffuser pipe (14).
Insulate inside. Then, since the internal pressure of the membrane separation unit (7) increases, the drainage (4) permeates the membrane module (13) using this as a driving force, and is filtered there. Then, the treated water is discharged from the discharge part (9) to the outside of the apparatus.

The above steps are repeated by intermittently operating the air blower (13). Clarified and stable treated water with improved water quality can be obtained. It is also possible to discharge the treated water at a constant flow rate. The surface of the membrane module (13) is cleaned by the bubbles ejected from the air diffuser pipe (14).

In this way, the driving force for the movement of the wastewater (4) during the filtration treatment by the membrane module (13) can be obtained by the air supply means called the air blower (10), and the suction pump is used as in the conventional case. Don't do it. The air supply means is a simpler means than the suction pump, and therefore, the apparatus as a wastewater treatment apparatus can be downsized and is cost effective. Further, since the surface of the membrane module (13) is washed by the bubbles ejected from the air diffuser pipe (14), clogging due to the filtration process can be suppressed.

FIG. 3 is a sectional view showing another example of the membrane separation unit. The example of FIG. 3 has almost the same configuration as the example of FIG. 2, but a U-shaped tube (15) is connected to the discharge part (9) inside the membrane separation unit (7). It's different. By connecting this U-shaped pipe (15) to the discharge part (9), it is possible to regularly introduce and filter the waste water (4) without operating the air blower (10) intermittently as in the example of FIG. It can be treated and discharged, and the treated water can be discharged at a constant flow rate.

That is, as shown in FIG. 4, the drainage (4) passes through the drainage introducing part (8) and the U-shaped pipe (15).
When flowing into the inside, the water pressure in the membrane separation unit (7) is pushed down by the air pressure of the air sent from the air blower (10), and the water permeates the membrane module (13),
The filtered treated water is discharged out of the apparatus through the discharge part (9). Along with the discharge of this treated water, a U-shaped pipe (15)
The water level inside will decrease.

Next, as shown in FIG. 5, when the treated water is discharged from the discharge part (9) and the water level in the U-shaped pipe (15) drops to the bottom, air in the membrane separation unit (7) is discharged. Escape through the discharge part (9). At this time, a temporary negative pressure is applied to the membrane module (13), and the membrane module (1
3) will be backwashed. Then, when the inside of the membrane separation unit (7) becomes equal to the atmospheric pressure, the discharge of the treated water is stopped. At the same time, as shown in FIG. 6, due to the head difference, the drainage water (4) flows into the membrane module (13) through the check valve (12) of the drainage introduction part (8), and the pressure causes the drainage water ( 4) penetrates the membrane module (13). Wastewater (4) is filtered.

Furthermore, the water level of the wastewater (4) rises, and
As shown in FIG. 5, when the tip of the U-shaped pipe (15) is reached, the drainage water (4) flows into the U-shaped pipe (15). When the inside of the U-shaped pipe (15) is closed by the drainage (4), the state shown in FIG. 4 is entered again. Thus, the discharge part (9)
By simply connecting the U-shaped pipe (15) to, it is possible to introduce the drainage (4), perform the filtering process, and discharge it without intermittently operating the air supply means. The operability of the filtration operation becomes easy. Moreover, as shown in FIG. 5, due to the U-shaped pipe (15), a negative pressure is temporarily applied to the membrane module (13), which allows backwashing, and the wastewater treatment device The continuous operation time can be extended and the life of the device can be extended.

In the above example, the check valve is adjusted by appropriately adjusting the arrangement position of the membrane separation unit (7) (the installation height of the drainage (4) from the water surface), the shape of the U-shaped pipe, and the like. It is possible to omit (12). Of course, the present invention is not limited by the above examples. It goes without saying that various aspects are possible in details such as the configuration and structure of the air supply unit, the wastewater treatment unit, and the like.

[0024]

As described in detail above, according to the present invention, wastewater treatment by membrane separation can be realized with a simple device configuration. Moreover, clogging of the film surface is suppressed, and the operational stability can be improved. The quality of treated water is improved and becomes stable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the wastewater treatment equipment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a membrane separation unit.

FIG. 3 is a cross-sectional view showing another example of the membrane separation unit.

FIG. 4 is a cross-sectional view showing an example of an operating state of the example of FIG.

5 is a cross-sectional view showing an example of an operating state of the example of FIG.

6 is a cross-sectional view showing an example of an operating state of the example of FIG.

7 is a cross-sectional view showing an example of an operation state of the example of FIG.

[Explanation of symbols]

 1 Treatment Tank 2 Wastewater Treatment Section 3 Wastewater Introductory Section 4 Wastewater 5 Air Blower 6 Diffuser Tube 7 Membrane Separation Unit 8 Wastewater Introducing Section 9 Discharge Section 10 Air Blower 11 Overflow Discharge Section 12 Check Valve 13 Membrane Module 14 Diffuser Tube 15 U-shaped Tube

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Akio Kubota 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Hideaki Yamada, 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (3)

[Claims] 1. A wastewater treatment apparatus comprising a membrane separation unit, wherein the membrane separation unit has a lower end portion to which a membrane module is connected and communicates with the outside of the apparatus, a treated water discharge portion, a wastewater introduction portion, and a membrane. Wastewater treatment characterized in that it is provided below the module and has an air diffuser connected to the air supply means, and is provided at a position where it is immersed in wastewater in a treatment tank having a built-in wastewater treatment unit. apparatus. 2. The wastewater treatment equipment according to claim 1, wherein a U-shaped pipe is connected to the discharge part. 3. The wastewater treatment equipment according to claim 1, wherein the wastewater treatment unit is filled with a microorganism carrier.