JPH09225272A - Membrane separation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the inspection and the maintenance of a diffuser by making each diffuser disposed in the lower side of a membrane separation unit over the entire width made of a 1st and a 2nd diffusing fixture extending to the center individually from both end sides in the width direction of the lower side of the membrane separation unit. SOLUTION: In a septic tank, a membrane separation tank E2 is provided with a membrane separation unit Y provided in parallel with many flat membranes and a diffuser S disposed in the lower side thereof and for supplying air bubbles to the membrane separation unit Y. An air diffuser M is constituted of the 1st diffusing fixture S1 and the 2nd diffusing fixture S2, which extends to the center individually from the both end sides in the width direction of the membrane separation unit Y, and an air supply pipe K communicating with and connected to each of the diffusing fixtures S1 and S2 is detachably attached and fixed to an engaging arm. That is, since each of diffusing fixtures S1 and S2 is capable of being drawn out after rotated and slid around the air supply pipe K as an axis, the inspection and the maintenance of the air diffuser are facilitated.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a membrane separation unit Y.
The present invention relates to a membrane separation device in which an air diffuser S for supplying air bubbles is provided below the membrane separation unit Y over substantially the entire width of the membrane separation unit Y.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 9 and 10, an air diffusing device S in a membrane separating device M of this type has a plurality of air diffusing devices So having a length substantially over the entire width of the membrane separating unit Y. They are arranged side by side on the stays U provided below the membrane separation unit Y, and are attached and fixed by the fixtures G, respectively.

[0003]

However, when the membrane separation device is operated for a long period of time, the diffuser holes Sh of the air diffuser are apt to be clogged due to the increase in the viscosity of the impurities and the activated sludge in the activated sludge. . At the place where the clogging occurs, the upward movement of the treatment liquid due to the sufficient rise of bubbles cannot be obtained, so that the cleaning action of the treatment liquid on the surface of the flat membrane m cannot be performed well and the membrane surface may be clogged. Sh is gradually clogged, so it can be prevented by inspecting and cleaning it occasionally.

However, since the air diffusers So each having a length substantially equal to the entire width of the membrane separation unit Y are attached and fixed to the stays U provided below the membrane separation unit Y, the air diffuser S is provided. If inspection and maintenance of the
After taking out the membrane separation unit Y from the membrane separation tank E2, the fixture G has to be removed from the stay U to separate the air diffuser So, which is very troublesome. In addition, since the air diffuser So is long, the pressure becomes lower toward the lower side from the air supply unit, uneven distribution is likely to occur, and air bubbles are difficult to control, so that the surface of the flat membrane m is excellent. It was difficult to wash and was not very preferable. Therefore, an object of the present invention is to solve the above problems,
An object of the present invention is to provide an air diffusing device S that allows easy inspection and maintenance of the air diffusing device S, and that enables uniform supply of bubbles to the membrane separation unit Y.

[0005]

Means for Solving the Problems [Characteristic Configuration 1] The characteristic configuration of the present invention for achieving the above-mentioned object is to provide a first dispersion separately extending to the central portion from both ends in the width direction below the membrane separation unit. An air diffuser and a second air diffuser are provided to configure the air diffuser, and an air supply pipe is communicatively connected to each of the first air diffuser and the second air diffuser, and each air supply pipe is detachable. The point is that it is freely attached to the frame of the membrane separation unit.

[Operation of Characteristic Configuration 1] That is, since the first air diffuser and the second air diffuser are configured to extend from both ends in the width direction to the central portion, each air diffuser is relatively short. The air diffuser can be easily taken out of the membrane separation tank by removing the air supply pipe connected to each of the air diffusers from the frame of the membrane separation unit.

[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 FIG. 1, in order from the upstream side, a precipitation separation tank N1, an anaerobic filter bed tank N2, a denitrification tank E1, a membrane separation tank E2, a disinfection tank Q, and a treated water tank T are installed so that the water to be treated is advected and a septic tank Is configured.

The sedimentation separation tank N1 receives the raw water of the water to be treated which has flowed into the septic tank from the inflow port I, precipitates and removes the impurities in the water to be treated, and at the same time, the anaerobic bacteria living inside the The treated water is anaerobically treated, and can be freely transferred to the anaerobic filter bed tank N2. The anaerobic filter bed N2 is internally provided with an anaerobic filter bed F capable of growing anaerobic bacteria that anaerobically treat the inflowing treated water, and anaerobically treats the treated water advancing from the precipitation separation tank N1. And is admitted to the denitrification tank E1.

The denitrification tank E1 primarily stores therein the water to be treated having a relatively low solid component concentration that has flowed in from the anaerobic filter bed tank N2, while growing denitrifying bacteria, which mainly denitrify the water to be treated, inside. It is configured to Further, the denitrification tank E1 is internally provided with a transfer pump A for pumping the water to be treated by an air lift action and transferring it to the membrane separation tank, and is configured to constantly transfer the water to be treated to the membrane separation tank E2. is there.

The membrane separation tank E2 is, as shown in FIG.
A membrane separation device M including a membrane separation unit Y formed by arranging a number of flat membranes m in parallel and an air diffuser S for supplying bubbles to the membrane separation unit Y provided below the membrane separation unit Y. It is decorated. The air diffuser M is composed of a first air diffuser S1 and a second air diffuser S2, which are individually extended from the both ends in the width direction of the membrane separation unit Y to the center, and the first air diffuser is used. The air supply pipe K connected to each of the tool S1 and the second air diffuser S2 is detachably attached and fixed to the locking arm Yb provided on the frame Ya of the membrane separation unit Y, and the first air diffuser S is attached.
1 and the second air diffuser S2 are supported, and air is supplied from the blower B to supply air bubbles to the membrane separation device M to prevent excessive deposition of sludge or the like on the membrane surface of the flat membrane m. In addition, oxygen can be supplied to the water to be treated while forming an upward flow of the water to be treated in the membrane separation tank E2.

As shown in FIGS. 3 and 4, each of the air diffusers is formed by connecting an air supply pipe K to a box-shaped air diffuser body Sa whose lower portion is opened. A plurality of air diffusion holes Sh for air diffusion are provided on both left and right side plates of the ingredient body Sa in the longitudinal direction. Incidentally, the first and second air diffusers S
The air supply to S1 and S2 is made by distributing the air supply from one blower B through a pipe, and adjusting the distribution amount of each by a valve V, and to each air diffuser via each air supply pipe K. Supplied. At this time, the first air diffuser S1 and the second air diffuser S2
Since it is configured to extend from both ends in the width direction to the central part, each of the air diffusers can be made relatively short, and a plurality of air diffusers arranged in parallel can be arranged while reducing the deviation of air diffuser for each air diffuser. It becomes possible to control the deviation of air diffusion between the air diffusers by adjusting the valve V. Further, since the lower part of the air diffuser is open, even if clogging occurs, excess air bubbles are released from the open part C, so that it is possible to prevent the worst situation in which the air cannot be diffused.

A water collecting pipe m1 is connected to each of the flat membranes m of the membrane separating device E2, and a water collecting pipe m2 for joining the filtered water from the water collecting pipe m1 and guiding it to the outside of the membrane separating tank is connected. It is connected to a disinfection tank Q provided adjacent to the membrane separation tank E2 below the water surface of the membrane separation tank E2. The treated water tank T is internally provided with an underwater pump P. After the treated water is stored, the treated water is pumped up by the submersible pump A and can be discharged from the discharge port Z to the outside of the septic tank through the discharge pipe O. There is.

In such a septic tank, the water to be treated flowing in through the inflow port I is anaerobically treated through the precipitation separation tank N1 and the anaerobic filter bed tank N2, and the denitrification tank E1.
Flow into the membrane separation tank E2 by the transfer pump A, and then the membrane-separated device M performs membrane separation treatment, and the membrane-separated filtered water is sterilized in the disinfection tank Q and then treated water tank. The water is temporarily stored at T and is discharged from the discharge port Z to the outside of the septic tank by the submersible pump P via the discharge pipe O.

In the above septic tank, the first and second air diffusers S1 and S2
When inspection and maintenance of the air diffuser S is required, first, the manhole H above the membrane separation tank E2 is opened and fixed to the locking arm Yb provided in the frame Ya of the membrane separation unit Y. The air supply pipe K is unlocked, and the air supply pipe K is rotated and rocked to retract the air diffuser from below the membrane separation unit Y, and by pulling it up, it can be taken out of the septic tank. After the inspection and maintenance are completed, the reverse process is performed to easily set the first and second air diffusers S1 and S2, which are the air diffusers S, below the membrane separation unit Y. You can At this time, since a display line L for height confirmation is written on the mounting portion of the locking arm Yb of the air supply pipe K, the locking arm Yb provided on the frame Ya of the membrane separation unit Y at the time of mounting. By adjusting the above-mentioned display line L provided on the air supply pipe K, it is possible to easily adjust the height of bubble supply of the air diffuser to the membrane separation device M.

[Other Embodiments] In the previous embodiment, the first air diffuser S1 and the second air diffuser S2 are respectively extended from the widthwise both ends below the membrane separation unit Y to the central portion. Although one air diffuser is connected to each air supply pipe K, the present invention is not limited to this, and as shown in FIG.
Alternatively, a single air diffuser bent in a U shape may be connected.

The shape of the air diffuser is not limited to the above embodiment, either.
As shown in FIG. 6, the air diffuser body Sa is made of a pipe material, and a plurality of mountain-shaped air diffusion holes Sh are provided on the side surface of the pipe, and a downward opening portion C is provided at the tip of the pipe. Since the air diffuser Sh is formed in a chevron shape, clogging is less likely to occur, and even if clogging occurs, excess air bubbles are released from the open portion C, so that air diffusion is not impossible. Further, not only the locking arm Yb at the upper part of the membrane separation unit Y but also the locking portions are provided in pairs at the stays Ua provided below the film separation unit Y as shown in FIGS. 7 and 8. A stop arm Ub is provided, and further,
By forming the shape of the opening R below the frame of the membrane separation unit into a trapezoidal shape that becomes narrower toward the top, the inclination of the side surface of the opening R is such that the air diffusers S1 and S.
It serves as a guide surface Ra for locking 2 to the locking arm Ub. That is, by inserting the air diffusers S1 and S2 into the opening R and raising the air supply pipe K connected in communication with the air diffusers S1 and S2, the air diffuser body Sa moves to the side surface of the opening R. It is slidably guided by the guide surface Ra and engages with the locking arm Ub. With the above configuration, not only the position of the air diffusers S1 and S2 can be easily aligned, but also the displacement of the air diffusers S1 and S2 can be prevented as compared with the case where only the locking portion of the upper portion is provided.

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 accompanying drawings by the description.

[0018]

As described above, according to the present invention, the first and second air diffusers can be rotated and oscillated around the air supply pipes and then withdrawn even in a small space. Therefore, the membrane can be removed from the membrane separation tank. Since it is not necessary to take out the separation unit, the air diffuser can be easily inspected and maintained. As a result, it is possible to prevent clogging of the air diffuser and to easily clean the clogging, making it possible to increase the oxygen dissolution efficiency by making the diffusing holes relatively small and maintain high water treatment performance. I can do it now. Also,
Since the air diffuser can be made relatively short, it is easy to make the air diffuser less biased as a whole.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional side view of the membrane separation tank.

FIG. 3 is a plan view of the membrane separation tank.

FIG. 4 is a perspective view of the air diffuser.

FIG. 5 is a plan view of a membrane separation tank according to another embodiment.

FIG. 6 is a perspective view of another form of the air diffuser.

FIG. 7 is a front view of a main part of another embodiment.

FIG. 8 is an explanatory view of the operation of main parts of another embodiment.

FIG. 9 is a cross-sectional side view of a conventional membrane separation tank.

FIG. 10 is a plan view of a conventional membrane separation tank.

[Explanation of symbols]

 Y Membrane separation unit S Air diffuser S1 First air diffuser S2 Second air diffuser K Air supply pipe Ya frame Yb Locking arm Sa Air diffuser body Sh Air diffuser C Opening part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaharu Iwahashi 1 stock at 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Inside of Kubota Shiga Plant (72) Katsumi Hamada 2 stock, 2 Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Inside the Kubota Shiga Plant (72) Inventor Shinichi Furuse 2 at Takamatsu, Kosai-cho, Koga-gun, Koga-gun, Shiga Prefecture Inside the Kubota Shiga Plant

Claims (1)

[Claims] 1. A membrane separation device in which an air diffuser S for supplying bubbles to the membrane separation unit Y is provided below the membrane separation unit Y over substantially the entire width of the membrane separation unit Y. The first air diffuser S1 and the second air diffuser S2, which are separately extended to the central portion from both ends in the width direction below the membrane separation unit Y, are provided to configure the air diffuser S, and the first air diffuser S is formed. A membrane separation device in which an air supply pipe K is communicatively connected to each of the air implement S1 and the second air diffuser S2, and each of the air supply pipes K is detachably attached to the frame Ya of the membrane separation unit Y.