JPH09174074A - Purifying tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purifying tank capable of rapidly stopping the solid-liquid separation of water to be treated when the operation of a membrane separation tank is changed over from an air diffusing period to an air diffusion stopping period though a constitution sucking and filtering water to be treated from a membrane separation apparatus by the air lift action due to a U-shaped pipe is employed. SOLUTION: A membrane separation tank E and a disinfection tank Q are provided and the intake pipe M2 taking out the water to be treated permeated through the filter membrane of a membrane separation apparatus M is provided to the membrane separation apparatus M and a U-shaped pipe U feeding the water to be treated from the intake pipe M2 to the disinfection tank is provided and the opening end part on one side U1 of the U-shaped pipe U is connected to the intake pipe M2 and the opening end part on another side U2 thereof is connected to the disinfection tank Q, and an air supply part U3 is provided to the lower part on the another side U2 of the U-shaped pipe U. A communication and connection passage 1 connected to the lower part of the disinfection tank Q is provided between the air supply part U3 of the U-shaped pipe U and the opening end part on the another side U2 of the U-shaped pipe U and the water to be treated in the disinfection tank Q is freely returned only to the inside of the U-shaped pipe U through the communication and connection passage 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane separation tank for filtering water to be treated by a membrane separation device, and to disinfect the water to be treated filtered by the membrane separation device and to discharge it to the outside of the tank. A water treatment pipe for transporting treated water from the water intake pipe to the disinfection tank, wherein the membrane separation device is provided with an intake pipe for taking out the treated water that has passed through the filtration membrane of the membrane separation device. It relates to a septic tank provided with a passage.

[0002]

2. Description of the Related Art For a septic tank of this type, the treated water transfer path is composed of a U-shaped pipe, and one open end of the U-shaped pipe is connected to the water intake pipe and the other end is connected to the other end. It is considered that the open end on the side is connected to the disinfection tank so as to communicate therewith, and the air supply unit is provided on the lower portion on the other side of the U-shaped tube. In addition, when operating such a septic tank, generally, in order to improve the water treatment efficiency of the water to be treated, an aeration period in which the water to be treated is usually filtered while air is being diffused to the membrane separator, Operation while switching the air diffusion stop period that stops air diffusion to the membrane separation device (hereinafter abbreviated as intermittent aeration operation)
There are things to do.

[0003]

According to the intermittent aeration operation, solid-liquid separation by the membrane separator and solid components generated by the solid-liquid separation are separated from the membrane surface of the filtration membrane during the aeration period. The washing is performed at the same time to promote the water treatment in the membrane separation tank during the diffusion stop period, but when the water to be treated is filtered during the diffusion stop period, the membrane surface of the filtration membrane is Although the solid component accumulates but is not washed, the solid component may accumulate as dirt on the film surface and become hard to peel off and be fixed. It was necessary to clearly switch to the suspension period. However, according to the above-mentioned conventional septic tank, the suction force for sucking the water to be treated is obtained from the membrane separation device by the air lift action by the air supply from the air supply part at the lower part on the other side of the U-shaped tube. Therefore, when switching the operation of the membrane separation tank from the diffusion period to the diffusion stop period,
When the air supply to the U-shaped tube is stopped, the air in the U-shaped tube is released into the atmosphere and the water level L in the U-shaped tube is increased.
It has been considered that the water level LU in the U-shaped tube becomes lower than the water level in the membrane separation tank because U decreases by the volume of the released air (see FIG. 3). That is, the relationship between the water level LU in the U-shaped tube and the water level LE in the membrane separation tank is
Since the membrane separation device M has a positional relationship that produces a filtration pressure of the water to be treated, the solid-liquid of the water to be treated is solid-liquid even though the operation of the membrane separation tank is switched from the diffusion period to the diffusion stop period. When separation occurs, there is a risk that the membrane surface will be contaminated and settled as described above.Therefore, if the operation of the membrane separation tank is switched from the air diffusing period to the air diffusing stop period, the treated material will be treated quickly. A septic tank having a structure capable of stopping solid-liquid separation of water has been desired.

Therefore, in view of the above-mentioned drawbacks, an object of the present invention is, for example, when performing intermittent aeration operation while adopting a structure in which the water to be treated is suction-filtered from the membrane separation device by the air lift action by the U-shaped tube. An object of the present invention is to provide a septic tank that can quickly stop solid-liquid separation of water to be treated when the operation of the membrane separation tank is switched from the air diffusion period to the air diffusion stop period.

[0005]

Means for Solving the Problems The features of the present invention for achieving this object are a membrane separation tank for filtering water to be treated by a membrane separator, and a membrane filtered by the membrane separator. The membrane separation device is provided with a disinfection tank that disinfects the treated water and allows it to be discharged to the outside of the tank, and a water intake pipe for taking out the water to be treated that has permeated the filtration membrane of the membrane separation device is provided in the membrane separation device. In a septic tank provided with a treated water transport path for transporting water to the disinfection tank, the treated water transport path is composed of a U-shaped pipe, and an opening end portion of one side of the U-shaped pipe is the intake pipe. To the disinfecting tank, and an air supply unit is provided in the lower portion of the other side of the U-shaped pipe, and the air supply unit in the U-shaped pipe and the other side. A communication connection path is provided between the open end of the disinfection tank and the lower part of the disinfection tank. , Via the communication connection path lies in the treated water in the sterilization bath are constituted freely only back to the inside of the U-shaped tube, its functions and effects are as follows.

[Effects] That is, the membrane separation tank for filtering the water to be treated by the membrane separation device, and the disinfection to sterilize the water to be treated filtered by the membrane separation device so that it can be discharged to the outside of the tank. The membrane separation device is provided with a water intake pipe that takes out the water to be treated that has passed through the filtration membrane of the membrane separation device, and the water to be treated transport path that conveys the water to be treated from the water intake pipe to the disinfection tank is provided. Provided, the treated water transport path is composed of a U-shaped pipe, and one open end of the U-shaped pipe is connected to the water intake pipe and the other open end is connected to a disinfection tank. Then
Since the air supply part is provided at the lower part of the other side of the U-shaped pipe, the water to be treated is sucked from the membrane separation device by the air lift action by the air supply from the air supply part of the lower part of the other side of the U-shaped pipe. It is possible to obtain a suction force for performing solid-liquid separation in the membrane separation device, and it is possible to convey the water to be treated that has been solid-liquid separated to the disinfection tank.
At this time, since a communication connection path that connects and communicates with the lower portion of the disinfection tank is provided between the air supply portion of the U-shaped tube and the opening end portion on the other side, the lower portion of the disinfection tank is Since it is in communication with the U-shaped tube and the water to be treated in the disinfection tank can be returned only from the disinfection tank to the inside of the U-shaped tube, Even when the air supply to the U-tube is stopped when the operation is switched from the air diffusion period to the air diffusion stop period, the air in the U-shaped pipe is released into the atmosphere and the water level in the U-shaped pipe decreases. After that, a part of the water to be treated in the disinfection tank will be returned to the U-shaped pipe whose water level has dropped, and the water surface in the U-shaped pipe will be maintained at a high position to allow the membrane separation. It is unlikely that the water level in the tank will be higher than the water level in the U-shaped pipe.

Therefore, while adopting the construction in which the water to be treated is suction-filtered from the membrane separation device by the air lift action by the U-shaped tube, immediately after the operation of the membrane separation tank is switched from the aeration period to the aeration stop period. However, the inconvenience of solid-liquid separation of the water to be treated is unlikely to occur during the period of suspension of diffusion, and further, the disinfectant in the water to be treated flowing back from the disinfection tank into the U-shaped tube is a film. When it reaches the surface, stains on the membrane surface are removed by the chemical cleaning effect of the disinfectant, and as a result, it is difficult for dirt to be fixed on the membrane surface of the membrane separation device, and further, because the membrane separation device is less likely to become dirty, Steady operation is possible without performing maintenance for a longer period of time than before, and the labor required for maintenance of the conventional membrane separation device can be reduced.

Further, since the water to be treated in the disinfecting tank is returned only from the disinfecting tank to the inside of the U-shaped pipe in the communication connecting path, the water to be treated rising in the U-shaped pipe is Also, it is possible to prevent the inconvenience of short-circuit advection into the disinfection tank through the communication connection path, and to prevent the regular treatment of the water to be treated from being disturbed. Further, even when the air supply to the U-shaped tube is temporarily stopped at the time of maintenance of the membrane separation tank or the disinfection tank, it is less likely that the membrane separation device performs the solid-liquid separation process more than necessary. Therefore, it is particularly useful regardless of the state of air supply to the membrane separation device.

[0009]

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, the septic tank of the present invention is divided into a cylindrical septic tank main body X by providing mirror portions X1 and X2 at both ends to form a sealed space inside and partition walls provided in the sealed space inside. Then, a precipitation separation tank N1, a flow rate adjustment tank N2, a membrane separation tank E, and a disinfection tank Q are formed from the upstream side, and a manhole H used for maintenance or the like is provided above each of the tanks.

The sedimentation tank N1 is the septic tank body X.
By receiving the raw water of the treated water that has flowed into the septic tank from the inflow port I provided in one of the mirror portions X1 and precipitating and removing the impurities in the treated water, the anaerobic bacteria growing inside the When the first pump P1 for transferring the treated water to the flow rate adjusting tank N2 is provided in the water treatment chamber that temporarily stores the treated water while anaerobically treating the treated water, and a large amount of the treated water flows in, Even when there is no inflow of water to be treated for a long period of time, the water to be treated is constantly transferred to the flow rate adjusting tank N2 so as not to hinder the water treatment in each subsequent water treatment chamber.

The flow rate adjusting tank N2 is the precipitation separating tank N.
The first pump P1 is provided with an inflow pipe A1 for introducing the water to be treated from the precipitation separation tank N1 into the water treatment chamber adjacent to
It is provided by being connected to the above and constitutes an inflow path of the water to be treated. Further, the second pump P2 is internally provided, and the transfer pipe A2 is provided in the second pump P2 to transfer the water to be treated to the membrane separation tank E.

The membrane separation tank E includes a membrane separation device M and
An air diffuser D for supplying air bubbles to the membrane separation device M is internally provided, and a large number of filtration membrane plates M1 are arranged in parallel in the membrane separation device M and stretched over the filtration membrane plate M1. A water intake pipe M2 for taking out the water to be treated which has permeated the filtration membrane is provided and configured. Further, the water intake pipe uses the disinfecting tank Q for treating the water to be treated.
One side U of the untreated water transport path consisting of a U-shaped pipe U transported to
1 is connected in communication with the open end.

The U-shaped pipe U is provided with an air supply unit U3 at the lower part of the other side U2 so that the water to be treated can be transported by an air lift, and the disinfection tank Q is a chemical disinfectant Q1.
Is connected to an open water treatment chamber in an open end on the other side U2 of the U-shaped tube U, and the air supply section U3 in the U-shaped tube U and the opening on the other side U2 are connected. A communication connection path 1 is provided between the end and the lower part of the disinfection tank Q for communication. A check valve 2 is provided in the communication connection path 1 so that the water to be treated in the disinfection tank Q can only be returned to the inside of the U-shaped pipe U.

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 flow rate adjusting tank N2 while the second pump A2 is used for the membrane separation tank E. Flow into the membrane separation tank E
The filtered water that has been subjected to the aerobic treatment and the membrane separation treatment in the above, and is subjected to the membrane separation treatment, is admitted to the disinfection tank Q through the treated water transport passage, is then disinfected, and is then discharged from the discharge tank Z to the outside of the purification tank. .

[0015]

EXAMPLE When the above-mentioned septic tank was operated, intermittent aeration operation was performed on the membrane separation device M of the membrane separation tank E. From the air diffusing period in which air was diffused from the diffuser pipe, When the operation is switched during the air diffusion stop period in which the air diffusion is stopped, the water to be treated in the disinfection tank Q automatically and promptly flows into the U-shaped pipe U, and the inside of the U-shaped pipe U Since the water level LU is maintained higher than the water level LE in the membrane separation tank, the solid-liquid separation by the membrane separation device M could be stopped quickly (Fig. 2
reference).

[Other Embodiments] Other embodiments of the present invention will be exemplified below. The precipitation separation tank N in the previous embodiment
1. The structure of the flow rate adjusting tank N2 is not limited to this. For example, the flow rate adjusting tank N2 may be provided with an anaerobic filter bed tank N2. In addition, aerobic bacteria for aerobically treating the water to be treated may be used. It may be configured by providing an aerobic filter bed tank in which an aerobic filter bed to be grown is provided, that is, a septic tank provided with a membrane separation tank E may be used. Further, as the septic tank, it suffices that the membrane separation tank E is configured to perform the solid-liquid separation treatment by the membrane separation device M, and the operating method of the septic tank is not limited to the above. That is, the operation method of the septic tank is not essential. Further, in the previous embodiment, as one example of the membrane separation device M, the one in which the filtration membrane plates M1 are arranged side by side is shown, but the invention is not limited to this, and a hollow fiber membrane or the like may be used. Are collectively referred to as a membrane separation device M.

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 sectional side view of a septic tank according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part for explaining the operation in FIG.

FIG. 3 is an enlarged view of a main part for explaining the operation of a conventional septic tank.

[Explanation of symbols]

 1 Communication connection path E Membrane separation tank Q Disinfection tank M Membrane separation device U U-shaped tube U1 One side U2 Other side U3 Air supply section

 ──────────────────────────────────────────────────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 tank (E) for filtering treated water with a membrane separator (M), and disinfecting the treated water filtered with the membrane separator (M) to the outside of the tank. A disinfection tank (Q) that enables discharge is provided, and a water intake pipe (M2) for taking out the water to be treated that has permeated the filtration membrane of the membrane separation device (M) is provided in the membrane separation device (M). Water to be treated from M2) is added to the disinfection tank (Q)
A septic tank having a to-be-treated water transporting path for transporting the to-be-processed water, wherein the to-be-treated water transporting path is composed of a U-shaped pipe (U), and an opening on one side (U1) of the U-shaped pipe (U) An end of the U-shaped pipe (U) is connected to the water intake pipe (M2) and an open end of the other side (U2) is connected to a disinfection tank (Q), and the lower part of the other side (U2) of the U-shaped pipe (U) is connected. Air supply unit (U3)
And the air supply unit (U3) in the U-shaped tube (U),
A communication connection path (1) is provided between the opening end of the other side (U2) and the lower part of the disinfection tank (Q).
A septic tank configured so that only the water to be treated in the disinfection tank (Q) can be freely returned to the inside of the U-shaped tube (U) via the communication connection path (1).