JPH08132039A - Membrane separation device - Google Patents

Abstract

PURPOSE: To provide a membrane separation device easy to maintain. CONSTITUTION: A filtering membrane device with a separation membrane is provided on the membrane separation tank of a purifying tank and a water intake tube 3 is connected to the filtering membrane device and the water intake tube 3 is extended above a water level of the membrane separation tank and also a seeing through part 6 capable of seeing through an internal fluid is formed above a water level of the water intake tube 3 and a cover 7 for covering the seeing through part is exposably provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane separation device having a separation membrane provided in a membrane separation tank of a septic tank, and a water intake pipe connected to the filtration membrane device.

[0002]

2. Description of the Related Art Conventionally, as a membrane separation device of this type, an intake pipe is simply connected to each of a plurality of filtration membrane devices arranged in parallel, and treated water sucked through the intake pipe is joined. It was known that a confluence part was provided below the surface of the water.

[0003]

According to the above-mentioned conventional membrane separation apparatus, in order to check the water quality of the water to be treated, it is necessary to check the water quality of the water to be treated flowing out from the drainage section to the outside of the membrane separation tank. Therefore, even if the deterioration of the water quality of the treated water that has been subjected to membrane filtration is detected, it is not known from which filtration membrane device the deterioration of the water quality originates, and maintenance or replacement of the filtration membrane device (below When simply abbreviated as "maintenance"), all the filtration membrane devices must be individually inspected visually, and a filtration test of the water to be treated, etc. must be performed. , Was a cause of making the management work troublesome. In addition, when visually inspecting all of the filtration membrane devices and conducting a filtration test of the water to be treated, etc., temporarily stop the entire membrane separation device, lower the water level of the water to be treated in the membrane separation tank, and perform filtration. Since the membrane devices have to be taken out one by one, the above-mentioned work is more time-consuming and is a heavy labor.

Therefore, in view of the above drawbacks, an object of the present invention is to provide a membrane separation device which is easy to maintain.

[0005]

Means for Solving the Problems A plurality of filtration membrane devices each having a separation membrane are provided in a membrane separation tank of a septic tank, and an intake pipe is connected to each of the filtration membrane devices, and suction is conducted through each intake pipe. In a membrane separation device in which a confluent part for converging treated water is provided, and a drain pipe is continuously provided to each of the intake pipes through the confluent part, the characteristic configuration of the present invention for achieving this object is Each intake pipe is extended above the water surface of the membrane separation tank, a transparent portion through which the internal fluid can be seen is formed in the above-water exposed portion of the intake pipe, and a cover that covers the transparent portion is provided. Or a plurality of filtration membrane devices equipped with separation membranes are provided in the membrane separation tank of the septic tank, and the water level of the water to be treated that is adjacent to the membrane separation tank and is stored inside Install a water treatment tank that is set lower than the water level in the tank. In a membrane separation device in which an intake pipe is connected to each of the filtration membrane devices and the intake pipe is extended into the water treatment tank, the water treatment tank of the intake pipe located above the water surface of the water treatment tank. The side portion is provided with a see-through portion that allows see-through of the internal fluid, and a cover is provided to cover the see-through portion so that the see-through portion can be exposed. The action and effect are as follows.

[0006]

That is, since the water intake pipe is extended above the water surface of the membrane separation tank, and the transparent portion through which the internal fluid can be seen is formed above the water surface of the water intake pipe. Separation Membrane If the surface of the water to be treated has a "leak" that is not sufficiently filtered and penetrates due to scratches or holes on the membrane surface, then the treated water that has not been sufficiently filtered and has permeated Is less transparent than the water to be treated that has been sufficiently filtered. Therefore, by visually observing the internal fluid of the water intake pipe from the transparent portion, whether or not the internal fluid has been sufficiently filtered. Can be determined. Therefore, the membrane separation device is temporarily stopped in the membrane separation tank to lower the water level of the water to be treated,
The property of the internal fluid can be determined without performing the work of pulling out the filtration membrane device once, and the maintenance can be performed extremely easily.

Further, since the membrane separation tank usually contains a large amount of solids such as activated sludge components, it may be easy for dirt to adhere to the see-through portion after long-term use. By providing a cover that covers the see-through portion so that the see-through portion can be easily exposed and configured to be freely maintainable, the cover can be covered on the see-through portion during a period when maintenance is not required. By keeping it in the open state, it is possible to prevent dirt from adhering and maintain it easily at all times.

Further, since the property of the internal fluid can be detected before the water to be treated joins the confluence part, if a leak of the water to be treated is found, that is, it is connected to the intake pipe. Since it can be judged that the filtration membrane device is damaged,
The leak position can be easily specified.

Further, when a water treatment tank adjacent to the membrane separation tank is provided and an intake pipe is extended in the water treatment tank, the water treatment tank located above the water surface of the water treatment tank is provided. By forming a transparent part on the side of the water treatment tank of the water pipe that allows the internal fluid to be seen through, the properties of the internal fluid can be determined before the water to be treated merges in the water treatment tank, and a filtration membrane that requires maintenance. The device can be specified and maintenance becomes easy.

Further, if the intake pipe is provided with a flow rate detection mechanism, the flow rate of the treated water in each intake pipe can be determined,
Not only the deterioration of water quality due to leakage of the filtration membrane device,
Since it is possible to detect a change in flow rate such as an increase in flow rate due to a leak and a decrease in flow rate due to clogging of the separation membrane,
Not only when the separation membrane is damaged but also when maintenance is performed due to clogging or the like, it is possible to easily determine whether or not clogging has occurred, and even when a plurality of filtration membrane devices are provided. However, there is an advantage that the clogged filtration membrane device can be easily specified.

[0011]

Therefore, the filtration membrane device leaking the water to be treated or the clogging filtration membrane device can be easily specified. Therefore, the specified filtration membrane device is simply replaced, repaired or washed. It is possible to perform maintenance with a simple work that only requires maintenance, and as a whole, it is possible to perform maintenance with light work while reducing the labor.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 3, the membrane separation device of the present invention is used by being installed in a membrane separation tank of a septic tank. This septic tank is configured by sequentially providing a settling separation tank N1, an anaerobic filter bed tank N2, and a membrane separation tank E in order from the inflow port I side into which the raw water to be treated flows so that the water to be treated can be naturally advected.

The sedimentation separation tank N1 receives the raw water of the water to be treated which has flowed into the septic tank from the inlet I, precipitates and removes the impurities in the water to be treated, and at the same time, by the anaerobic bacteria growing inside, The water to be treated is anaerobically treated and can be advected to the anaerobic filter tank N2.

The anaerobic filter tank N2 is internally provided with an anaerobic filter F capable of growing anaerobic bacteria for anaerobically treating the inflowing treated water, and anaerobically treats the treated water admitted from the precipitation separation tank N1. It is configured to be treated and advected to the membrane separation tank E.

The membrane separation tank E comprises a membrane separation device for membrane filtration of water to be treated, and a plurality of membrane separation devices below the membrane separation device.
Air bubbles are supplied to the membrane separation device to prevent excessive adhesion of sludge or the like on the membrane surface, and to form a circulating flow of the activated sludge mixed solution in the membrane separation tank E while the treated water is treated. An air diffuser D for supplying oxygen is installed.

As shown in FIGS. 2 and 3, in the membrane separation device, a separation membrane 2 made of a polyolefin resin or the like is stretched on a plate body 1, and an internal space of the plate body 1 is connected to a water intake pipe 3. A large number of filtration membrane devices (hereinafter simply referred to as flat membranes) M, which are configured to allow the water to be treated in the membrane separation tank E to pass through in the thickness direction of the separation membrane 2 to be filtered by being discharged through Yes,
Further, each of the flat membranes M is connected to a water collecting pipe 4 that joins the filtered treated water in the water intake pipe 3 above the water surface of the treated water, and the water collecting pipe 4 is suctioned. Pump P
It is connected to a discharge pipe 5 that guides the combined treated water through the water to the disinfection tank Q, and operates the suction pump P to take the filtered treated water from the flat membrane to the water intake pipe 3 ,
Water is pumped through the water collection pipe 4 and the discharge pipe 5, and can be transferred to the disinfection tank Q.

The water to be treated which has flowed into the disinfection tank Q is sterilized and then discharged from the discharge port Z to the outside of the septic tank.

As shown in FIG. 1, the water intake pipe 3 is constructed by providing a transparent pipe portion 6 above the water surface of the membrane separation tank E, and the transparent pipe portion 6 has the transparent pipe portion 6 formed therein. The covering tube 7 is slidably fitted on the portion 6 and fixed. In addition, a flow rate indicator vane 8 is provided inside the transparent pipe portion 6 so as to be swingable in accordance with a change in the flow velocity of the water to be treated, and the amount of fluid passing through the transparent pipe portion 6 can be detected. It is formed on.

With such a structure, the transparency of the water to be treated passing through the water intake pipe 3 is slid by moving the covering pipe 7 covering the transparent pipe portion 6 so that the fluid inside the transparent pipe portion 6 is moved. By visually observing, the color, flow rate, etc. of the fluid can be identified. As a result, when the color of the fluid is abnormally turbid, it is expected that the membrane surface of the separation membrane 2 of the flat membrane M connected to the water intake pipe 3 is damaged due to scratches or the like. When the flow rate of the fluid in the portion 6 is smaller than the flow rate of the fluid in the transparent tube portion corresponding to another flat membrane, the flat membrane M causes clogging due to adhesion of dirt on the membrane surface. In any case, it is possible to quickly determine which flat membrane M needs maintenance by only visually observing the fluid inside from the transparent tube portion 6.

[Other Embodiments] In the previous embodiment, the septic tank was constructed by providing the precipitation separation tank N1, the anaerobic filter bed tank N2, and the membrane separation tank E in this order from the inlet I side, but the present invention is not limited to this. For example, instead of the anaerobic filter bed N2, an aerobic filter bed containing an aerobic filter bed for growing aerobic bacteria that aerobically treats water to be treated is provided to constitute a septic tank. It is also possible to use a septic tank provided with the membrane separation tank E.

In the above embodiments, a flat membrane is shown as an example of the filtration membrane device, but the invention is not limited to this, and a filtration membrane device such as a hollow fiber membrane may be used, and these are collectively referred to as filtration. It is called a membrane device.

In the above embodiment, the treated water is sucked by the suction pump to be filtered. However, a storage tank adjacent to the membrane separation tank for storing the filtered treated water is provided. Along with the provision, the tip portion of the discharge pipe may be opened below the water surface of the membrane separation tank in the storage tank, and may be naturally filtered by a water head difference. It is easy to suppress the inconvenience that the filtration membrane device is easily clogged due to excessive filtration pressure applied to the separation membrane. Further, as shown in FIG. 7, the tip end portion of the water intake pipe is formed as a partition wall partitioning the membrane separation tank and the storage tank P above the water surface of the storage tank and below the water surface of the membrane separation tank. When a combined disinfection tank (water treatment tank) is provided and the tip of the intake pipe 3 provided in each filtration membrane device is extended to the combined disinfection tank, the side of the combined disinfection tank of the intake pipe 3 ( The transparent tube portion 6 may be provided on the side of the water treatment tank, and the cover 7 may be provided on the transparent tube portion.

Also, regarding the transparent pipe portion 6 of the water intake pipe 3,
It does not necessarily have to be completely transparent, as long as the fluid inside can be seen through, that is, it may be translucent,
Further, it is possible to color the back surface in white when seeing through it so that turbidity of the internal fluid can be easily recognized. Further, instead of the covering tube, an elastic half-split tubular body may be detachably attached.

That is, in the structure shown in FIGS. 4 and 5, the large diameter portion 63 having the semi-peripheral surface of the transparent portion 61 and the semi-peripheral surface of the white semi-transparent portion 62 is provided in the water pipe 3, and the transparent portion is provided. A half-split cylindrical cover 71 that covers the transparent portion 61 may be detachably attached to the portion 61, or may be rotatable in the circumferential direction of the water intake pipe 3.

Further, as shown in FIG. 6, a box-shaped cover 72 for covering the entire transparent tube portion 6 of the plurality of water collecting tubes may be provided. With such a configuration, it is convenient when the transparent pipe portions of the water intake pipes arranged side by side are visually checked at one time and the respective transparency is compared.

In the above-mentioned structure and the structure of the previous embodiment, the transparent pipe portion 6, the large diameter portion 63 and the like in which the fluid in the water intake pipe 3 is seen through is referred to as a see-through portion, and the covering pipe 7 is used. Members such as the half-split tubular cover 71 and the box-shaped cover 72 that cover the see-through portion so that they can be exposed are collectively referred to as a cover. In addition, the portion of the water collecting pipe 4 and the like in the above-described embodiment that is configured to be able to join and discharge the treated water is collectively referred to as a joining portion.

Further, instead of the flow rate indicator vane 8 such as a water wheel type flow meter and a flow rate sensor, various mechanisms for detecting the flow rate of the water to be treated can be used, and these are collectively called a flow rate detecting mechanism. . It should be noted that if the flow rate indicator blade 8 or a filamentous material that can be used instead of the flow rate indicator blade 8 is provided so as to be swingable or floatable within the see-through portion, the flow rate can be detected with a simple configuration, which is advantageous.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of a main part (intake pipe) of a membrane separation device.

FIG. 2 is a partially cutaway perspective view of a membrane separation device.

[Figure 3] Overall view of the septic tank

FIG. 4 is an enlarged perspective view of a main part of an intake pipe according to another embodiment.

5 is a lateral cross-sectional view of the main part in FIG.

FIG. 6 is an enlarged perspective view of a main part of an intake pipe according to another embodiment.

FIG. 7 is a perspective view of a part of the septic tank (storage tank) in another embodiment.

[Explanation of symbols]

 2 Separation Membrane M Filtration Membrane Device E Membrane Separation Tank 3 Intake Pipe 4 Confluence Section 5 Drainage Pipe 6 Transparent Section 7 Cover 8 Flow Rate Detection Mechanism

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuyuki Honda 1 at 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Kubota Shiga Plant (72) Inventor Katsumi Hamada 1 at 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Kubota Shiga Factory Co., Ltd.

Claims (3)

[Claims] 1. A plurality of filtration membrane devices (M) each comprising a separation membrane (2) are provided in a membrane separation tank (E) of a septic tank, and an intake pipe (3) is connected to each of the filtration membrane devices (M). Then, a confluence part for converging the treated water sucked through each of the intake pipes (3) is provided, and a drain pipe (5) is connected to each of the intake pipes (3) through the confluence part (4). In the above-mentioned membrane separation device, each of the water intake pipes (3) is extended above the water surface of the membrane separation tank (E), and an internal fluid is supplied to the above-water exposed portion of the water intake pipe (3). A membrane separation device comprising a see-through portion (6) which can be seen through, and a cover (7) which covers the see-through portion (6) so as to be exposed. 2. A plurality of filtration membrane devices (M) each comprising a separation membrane (2) are provided in a membrane separation tank (E) of a septic tank, adjacent to the membrane separation tank (E), and housed inside. The water level of the water to be treated is set lower than the water level of the membrane separation tank (E), and a water intake pipe (3) is connected to each of the filtration membrane devices (M). A membrane separation device in which a water pipe (3) is extended in the water treatment tank, wherein an internal fluid is provided at a side of the water treatment tank of the water intake pipe (3) located above the water surface of the water treatment tank. A membrane separation device comprising a see-through portion (6) which can be seen through, and a cover (7) which covers the see-through portion (6) so as to be exposed. 3. A flow rate detection mechanism (8) on the water intake pipe (3).
The membrane separation device according to any one of claims 1 and 2, further comprising: