JPH09136093A - Membrane separator mounting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the generation of retention and a turbulent flow in the circulating flow of water to be treated and to improve the efficiency of biological treatment of the water by installing base parts for mounting the foot part of a membrane separator in the bottom part of the membrane separation chamber of a purification tank main body to be separated from each other. SOLUTION: In the bottom surface part of the membrane separation chamber of a purification tank, although water to be treated forms a circulating flow consisting of an ascending flow which ascends between the filter membrane plates 1a of a membrane separator 1 and a descending flow which descends along the inner wall of a purification tank main body, the descending flow enters below the membrane separator 1 smoothly from between foot fixing base parts 6b along a bottom surface part which is curved in the front view of a vertical cross section. Therefore, the turbulent flow and retention of the water can hardly occur between the base parts 6b to solve problems in terms of biological water treatment including the generation of sludge precipitation and the incapability of treatment. Moreover, the contact efficiency of the water with the surface of the membrane plate 1a improves to increase the cleaning effect on the membrane surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a filtration membrane plate holding frame in which a large number of flat plate membrane filtration plates can be arranged side by side, and membrane separation for membrane filtration of water to be treated through the membrane filtration plate. The device
The present invention relates to a membrane separation device mounting portion that is mounted and fixed in a membrane separation chamber of a septic tank main body having a curved bottom surface in a vertical front view.

[0002]

2. Description of the Related Art Conventionally, as a membrane separating device mounting portion of this type, a supporting plate of the membrane separating device is arranged at the bottom of the membrane separating chamber of the septic tank body having a circular shape in vertical section, and a substantially horizontal membrane is provided. It is known that a mounting portion of a separation device is formed and the upper surface of the mounting portion is used as a membrane separation device attachment portion, and the membrane separation device is fixed to the membrane separation device attachment portion. It was

[0003]

That is, a horizontal bottom surface is formed inside the membrane separation chamber of the septic tank, the membrane separation device is horizontally arranged in the membrane separation chamber, and the membrane filtration plate is held by the membrane separation device. It is easy to form many of them upright and it is easy to make the flow of water to be treated near the membrane filtration plate uniform,
And, although the membrane separating device mounting portion is provided as described above in order to prevent the inconvenience that the dirt adhering to the membrane filtration plate is biased and the filtration performance is deteriorated, according to the above configuration,
By providing the placement part, the bottom surface of the membrane separation chamber becomes flat, a dead space is generated, and the circulating flow of the water to be treated in the membrane separation chamber is normally filtered by the membrane separation device in plan view. Since it is configured to rise from between the membrane plates and descend around the membrane separation device, the water to be treated descending in the membrane separation chamber collides with the bottom surface portion of the septic tank to generate a turbulent flow to generate a turbulent flow. There is a possibility that the biological flow efficiency of the treated water may be reduced due to a decrease in the flow velocity or accumulation of sedimented sludge due to retention (see FIG. 4), which may reduce the quality of the filtered treated water. In view of the above-mentioned drawbacks, an object of the present invention is to provide a technique that makes it difficult to cause retention or turbulence in the circulating flow of the water to be treated and maintain the biological treatment efficiency of the water to be treated high.

[0004]

A characteristic constitution of the present invention for achieving this object is to provide a filtration membrane plate holding frame in which a large number of flat plate membrane filtration plates can be arranged side by side. The membrane separation device for membrane-filtering the water to be treated via the membrane separation device mounting portion for mounting and fixing the membrane separation device on the membrane separation chamber of the septic tank main body having a curved bottom face in a longitudinal front view is provided in the membrane separation device. A plurality of leg fixing bases with mounting portions for mounting a plurality of legs separately are provided at the bottom of the membrane separation chamber of the septic tank main body separately from each other. The table part may be composed of a leg fixing table member that can be adhered to the septic tank main body, and the effects thereof are as follows.

[Operations / Effects] That is, at the bottom of the membrane separation chamber of the septic tank, the water to be treated rises between the filtration membrane plates of the membrane separation device and descends along the inner wall of the septic tank body. Although it becomes a circulating flow with, the downflow is smoothly intruded below the membrane separation device along the curved bottom surface portion from between the leg fixing base portions in a longitudinal front view. Become. Therefore, turbulent flow and retention of the water to be treated are less likely to occur between the leg fixing bases, sludge is likely to be generated, or the water to be treated may not be sufficiently treated. It is possible to solve the problem of microbial treatment of the water to be treated. Furthermore, by smoothing the circulation of the treated water from the downward flow to the upward flow, the circulation speed of the treated water can be maintained high, and on the contrary, the sedimented sludge is suspended in the treated water, It also has the function of activating the treatment of microorganisms. Further, since the circulation speed of the water to be treated can be kept high, the efficiency of contact of the water to be treated with the membrane surface of the membrane filter plate is improved, and the cleaning effect on the membrane surface is increased.

Further, if the leg fixing base portion is composed of a leg fixing base member and the leg fixing base member is provided so as to be adhered to the septic tank main body, depending on the size and shape of the membrane separation device, The arrangement position of the leg fixing base can be adjusted, and the membrane separation device can be reliably fixed using the small leg fixing base, so that the leg fixing base can prevent the circulation flow of the treated water. It is less likely that such a hindrance will occur, and it becomes possible to finely adjust the levelness of the leg fixing base.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 3, in the septic tank of the present invention, both ends of the cylindrical septic tank main body X are provided with the inspection parts X1 and X.
2 to form an enclosed space inside, and partition the interior enclosed space by partition walls, from the upstream side,
A flow rate adjustment tank N, a denitrification tank E1, a membrane separation tank E2, and a discharge pump tank T are sequentially formed from the upstream side, and a manhole H used for maintenance and the like is provided above each of the tanks. The membrane separation device mounting portion of the present invention is used for mounting and fixing the membrane separation device in the membrane separation tank.

The flow rate adjusting tank N receives the raw water of the water to be treated, which has flowed into the septic tank from an inlet I provided in one portion X1 of the septic tank main body 5, and removes impurities in the water to be treated. While removing the precipitate, anaerobic bacteria growing inside,
A first pump P1 for transferring the water to be treated to the denitrification tank E1 is provided in the water treatment chamber for temporarily storing the water to be treated while performing the anaerobic treatment of the water to be treated, Even when there is no inflow of the water to be treated for a long period of time, the water to be treated is constantly transferred to the denitrification tank E1 so as not to hinder the water treatment in each of the subsequent water treatment chambers.

The denitrification tank E1 is connected to the first pump P1 by connecting an inflow pipe A1 into the water treatment chamber adjacent to the flow rate control tank N, through which water to be treated from the flow rate control tank N flows. To form an inflow passage for the water to be treated. In addition, a second pump P2 is provided inside, and a transfer pipe A
2 is provided to transfer the water to be treated to the membrane separation tank E2. In addition, a stirring pump P4 that stirs and circulates the treated water in the tank is installed, and the treated water in the tank is mixed to mix the treated water having a high BOD load with the nitrified treated water. However, it is configured so that it can perform advanced denitrification processing.

As shown in FIGS. 1 and 2, in the membrane separation tank E2, the inflow passage is provided in a partition wall which separates the denitrification tank E1 from the denitrification tank E1. Return port A4 for returning treated water to the denitrification tank E1
Is provided to form a return path for the water to be treated. In addition, a large number of flat plate-shaped filtration membrane plates 1a, 1a, ... Are arranged in parallel in parallel in an upright state, and the membrane separation device 1 is equipped with the plurality of filtration membrane plates. Is provided with a filtration membrane plate holding frame 1b for aligning and holding the
b is provided to support b, and air bubbles are supplied to the filtration membrane plates 1a, 1a, ... Between the legs 2 to prevent sludge and the like from excessively adhering to the membrane surface, and , The membrane separation tank E
An air diffuser 3 for supplying oxygen to the water to be treated while internally forming a circulating flow in 2 is configured. Further, a water intake pipe 4 is connected to each of the filtration membrane plates 1a, 1a, ... Of the membrane separation device 1, and the filtered water from the water intake pipe 4 is joined and guided to the outside of the membrane separation tank E1. A water collecting pipe 5 is connected to and communicates with a discharge pump tank T adjacent to the membrane separation tank E2 below the water surface of the membrane separation tank E2.
Further, as shown in FIG. 2, the lower surface portion 6a along the membrane separation tank bottom surface portion X3 of the septic tank main body X and the lower surface portion 6a are arranged along the membrane separation tank bottom surface portion X3 of the septic tank main body X. A leg fixing base member 6 having a horizontal upper surface portion 6b in a state is provided, and the lower surface portion 6a is bonded and fixed to a position corresponding to the leg portion 2 below the membrane separation tank E2 of the septic tank main body X. Thus, the upper surface portions 6b are formed on the same horizontal plane.

The discharge pump tank comprises a disinfection tank Q1 and a storage tank Q2. The disinfection tank Q1 is the membrane separation tank E.
2 and the discharge pump tank T are provided with a treated water receiving container on a partition wall, and a small hole is provided on the wall surface thereof. The filtered water flowing into the disinfecting tank Q1 is sterilized and then stored in the storage tank. It flows into Q2. The storage tank Q2 is a third pump P3.
Is configured so that the treated water can be pumped up and discharged from the discharge port Z to the outside of the septic tank via the discharge pipe 7. As a result, the disinfected treated water is discharged from the storage tank to the outside of the septic tank almost quantitatively.

[Example] When the membrane separation apparatus 1 is installed in such a membrane separation tank E2, first, as shown in FIG.
The lower surface portion 6a of the leg fixing base member 6 is adhesively fixed to a position corresponding to the leg portion 2. In this state, the leg fixing base members 6 are provided at positions separated from each other and can be fixed so as not to block the space below the membrane separation device 1.
At this time, the worker can perform horizontal work in a spacious work environment in which the membrane separation device is not inserted into the tank, and can easily and accurately perform the work. Next, when the membrane separation device 1 is bolted to the upper surface portion 6a of the leg fixing base member 6 which is leveled out, the filtration membrane plate 1a of the membrane separation device 1 is stable in a parallel and upright state. It will be arranged in the membrane separation tank E1. Finally,
The membrane separation tank is filled with water and used as a septic tank.

Therefore, in the membrane separation tank E2, a substantially uniform water flow can be formed between the filtration membrane plates 1a of the membrane separation device 1 by operating the air diffuser 3, and sediment sludge is also accumulated. This makes it difficult to cause a difference in the adhesion state of dirt between the respective filtration membrane plates 1a or to cause retention in the tank, and it is easy to stably operate the septic tank for a long period of time.

Another embodiment will be described below. <1> In the above embodiment, the leg fixing base member 6 is adhered and fixed in the membrane separation tank, and the membrane separation device is placed on the upper surface thereof. Although the table part is composed of the leg fixing table member 6 and the upper surface part thereof is used as the mounting part, the present invention is not limited to this, and a projection part is integrally provided on the bottom surface part of the membrane separation tank, and the projection part is formed. The mounting portion may be formed on the base, and these are collectively referred to as the mounting portion-equipped leg fixing base portion B. <2> The membrane separation tank is an example of a membrane separation chamber, and a water treatment chamber in which a membrane separation device is installed inside a septic tank is generically called a membrane separation chamber.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a septic tank.

FIG. 2 is an overall perspective view of a membrane separation device.

FIG. 3 is a vertical sectional front view showing the circulation of water to be treated in the membrane separation tank.

FIG. 4 is a vertical sectional front view showing the circulation of treated water in a conventional membrane separation tank.

[Explanation of symbols]

 1 Membrane Separation Device 1a Membrane Filtration Plate 1b Filtration Membrane Plate Holding Frame 6 Leg Fixing Stand Member B Mounting Leg Fixing Stand E2 Membrane Separation Chamber X Septic Tank Main Body

Front page continuation (72) Inventor Masahisa Iwahashi 1 in 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Kubota Shiga Factory (72) Inventor Katsumi Hamada 1 in 2 Takamatsu, Kosai-cho, Shiga Prefecture Kubota Shiga, Ltd. Inside the factory (72) Inventor Shinichi Furuse 1 at 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Inside Kubota Shiga factory

Claims (1)

[Claims] 1. A filtration membrane plate holding frame (1b) in which a large number of flat membrane filtration plates (1a) can be arranged in parallel is provided, and the water to be treated is subjected to membrane filtration through the membrane filtration plate (1a). A membrane separation device attachment part for mounting and fixing the membrane separation device (1) to be mounted on the membrane separation chamber (E2) of the septic tank main body (X) having a curved bottom surface in a vertical front view. A plurality of leg mounting bases (B) with mounting portions for separately mounting the plurality of leg portions (2) provided in (1) are separated from each other and the membrane separation chamber (X) of the septic tank body (X) ( E2)
Membrane separation device mounting part provided at the bottom.