JP3258561B2 - Membrane separation device - Google Patents

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 large number of attachment portions to which a filtration membrane plate can be attached, and more specifically, to a membrane separation device used for a septic tank, for example.

[0002]

2. Description of the Related Art Conventionally, as this kind of membrane separation device, a large number of attachment portions to which a filtration membrane plate can be attached are arranged in parallel, and a filtration membrane plate is provided on all of the attachment portions. It has been known.

[0003]

In the case where the above-mentioned membrane separation device is used in a septic tank, the number of filter membrane plates that can be installed in the membrane separation device is determined by the number of mounting portions. Since the amount is limited to a predetermined amount for each separation device, the number of filtration membrane plates required for the water treatment often does not match the number of filtration membrane plates that can be juxtaposed in the membrane separation device. That is, the membrane separation device is manufactured in advance, and the number of attachment portions provided in the membrane separation device is, for example, 50, 60,...
The number of sheets is set to a value with high production efficiency, and individual measures such as manufacturing a membrane separation apparatus according to the need for water treatment are not performed because they are disadvantageous in terms of production efficiency. However, if the above-mentioned conventional membrane separation device is used, the number of filtration membrane plates required for water treatment (solid-liquid separation treatment by filtration membrane plates) is determined by the quality and quantity of water to be treated, and the setting may be changed. Therefore, the number of filtration membrane plates provided in the membrane separation device must be changed. Therefore, when such a setting change is inevitable, a membrane separation device provided with a larger number of mounting portions than the required number of filtration membrane plates is prepared and installed in parallel with the membrane separation device. It has been considered that a part of the filtration membrane plate is replaced with a rectifying plate that does not perform the membrane filtration treatment to reduce the number of filtration membrane plates that perform the water treatment to realize the required number of filtration membrane plates. For example, when performing water treatment requiring 52 filtration membrane plates, 52 filtration membrane plates are provided in a membrane separation device provided with 60 mounting portions, and 8
That is, a plurality of straightening plates are provided. However, it was considered that such a current plate should be arranged in one place and juxtaposed for convenience of management. However, in the case where the above-mentioned membrane separation device in which the straightening plates are collectively arranged in one place is installed in a water treatment chamber to perform water treatment, the arrangement of the filtration membrane plate in the water treatment chamber is performed. It has been pointed out that although the water treatment is performed smoothly in the position, the water treatment may not be performed smoothly in the position where the flow straightening plates are collectively arranged side by side. This tendency is likely to be strong if it must be a large percentage of the total number of copies.) Because the rectifying plate does not perform water treatment, the surroundings of the rectifying plate and the surroundings of the rectifying plate may be changed due to the adhesion of solids separated by solid-liquid separation and the change of water flow around the filtering membrane plate due to the solid-liquid separation pressure. This is because the flow of the water to be treated differs from the surrounding area, the water circulation becomes uneven, and the water to be treated around the rectifying plate stays and becomes difficult to be treated.

[0004] Accordingly, an object of the present invention is to provide, in view of the above circumstances, a case where the number of filtration membrane plates required for water treatment does not match the number of filtration membrane plates that can be juxtaposed in the membrane separation device. Another object of the present invention is to provide a membrane separation apparatus having a configuration in which the number of filtration membrane plates provided in the membrane separation apparatus is equal to the number required for water treatment, and in which there is little inconvenience in water treatment.

[0005]

The features of the present invention for achieving the object are as described in the claims. Further, referring to the drawings, the filter membrane plate 1 is mounted. In a membrane separation device having a large number of possible mounting portions 2 arranged side by side,
A rectifying plate 5 that does not perform a membrane filtration process is provided on the mounting portion 2, and the rectifying plate 2 is dispersed and disposed on both ends in the direction in which the mounting portions 2 are juxtaposed. 5
May be formed from a plate-like body in which an iron material is provided in an exposed state.

Incidentally, in order to explain the characteristic configuration, reference numerals are described with reference to the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Effects] In other words, since the above-mentioned membrane separation device has a large number of mounting portions to which a filtration membrane plate can be mounted, the filtration membrane plate is mounted on the mounting portion. Water treatment can be performed by housing the membrane separation device in a water treatment chamber containing the water to be treated. Here, assuming that the number of filtration membrane plates required for the water treatment chamber does not match the number specified for the membrane separation device, assuming that a rectifying plate that does not perform the membrane filtration process is attached to the mounting portion. By being provided, if a filtration membrane plate is provided in the other mounting portion, the number of filtration membrane plates provided in the membrane separation device can be matched with the number of filtration membrane plates required in the water treatment chamber. And a membrane separation device suitable for the water treatment can be provided. By the way, if the rectifying plates are provided in one place, there is a possibility that the inconvenience relating to the above-described water treatment may occur.However, the rectifying plates are distributed and arranged at both ends in the juxtaposing direction of the juxtaposed mounting portions. Therefore, the rectifying plate that does not perform the water treatment, regardless of the adhesion state of the solid-liquid separated solid, the difference in water flow around the filtration membrane plate due to the solid-liquid separation pressure, etc. The water to be treated can be circulated in a balanced manner in the juxtaposed direction. Further, in terms of the balance of the circulation of the water to be treated, since both ends of the mounting portion of the membrane separation device in the juxtaposition direction are also positions where the water to be treated is most likely to be disturbed, the circulation flow of the water to be treated is difficult to stabilize. In the position, the water is simply rectified without performing the water treatment, so it is also set so that the water treatment can be performed mainly in a position where the circulation flow is stable, and the water circulation is uneven. It is possible to reduce the occurrence of processing unevenness in the water to be treated due to the above.

[0008] Therefore, for example, a water treatment apparatus capable of accommodating one such membrane separation apparatus provided with 50 mounting portions, one in the width direction and two in the longitudinal direction. When applied to a septic tank provided with a chamber, even if the required filtration membrane plate is 80 sheets, by attaching a rectifying plate to each of the five mounting portions at both ends of each membrane separation device, The balance of the circulation of the water to be treated with respect to the filtration membrane plate in the water treatment chamber can be kept good, and the circulating flow of the water to be treated goes from the bottom to the top in the membrane separation device usually provided in the septic tank. At the end which tends to become a dead space when water flows below the juxtaposed filtration membrane plates of the membrane separation device, membrane separation does not occur, and the filtration membrane while maintaining good biological treatment of the water to be treated. Solid-liquid separation by plate is cheap And it can be performed by.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, taking as an example a case where a membrane separation device is used in a membrane separation chamber of a septic tank for performing a solid-liquid separation process on activated sludge. The septic tank is shown in FIGS. This septic tank is provided with observing parts X1 and X2 at both ends of a cylindrical septic tank main body X to form an enclosed space inside, and a partition wall is provided inside the enclosed space to divide the septic tank. A tank N, a denitrification tank E1, a membrane separation tank E2, and a discharge pump tank T are respectively provided as water treatment chambers, and a manhole H used for maintenance and the like is provided above each of the tanks.

The flow rate adjusting tank N receives raw water to be treated flowing into the purification tank from an inlet I provided in one mirror portion X1 of the purification tank main body X, and removes impurities in the treatment water. In addition to providing a punching screen F for filtration, a diffusing device C for supplying air bubbles to the punching screen F is provided so that the impurities can be crushed and fragmented while being filtered, and the filtered treated water to be treated is provided. A first pump P1 for transferring the water to be treated to the denitrification tank E1 is provided in the water treatment chamber where the water to be treated is temporarily stored, even when the water to be treated flows in a large amount or when there is no inflow of the water to be treated for a long 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 an inflow pipe A1 through which water to be treated from the flow rate adjusting tank N flows into the water treatment chamber adjacent to the flow rate adjusting tank N, to the first pump P1. To form an inflow passage for the water to be treated. In addition, a second pump P2 is provided therein, and the second pump P2 is provided with 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 P3 for stirring and circulating the water to be treated in the tank is provided to mix the water to be treated in the tank and mix the water to be treated with a high BOD load with the nitrified water to be treated. In addition, it is configured to perform advanced denitrification processing.

In the membrane separation tank E2, the inflow path is provided in a partition separating the denitrification tank E1, and the water to be treated excessively flowing from the denitrification tank E1 is supplied to the denitrification tank E1. A return port A4 for returning is provided to form a return path for the water to be treated. And, in the membrane separation tank E2,
Two membrane separation devices M according to the present invention are installed side by side in the longitudinal direction of the septic tank main body X.

The membrane separation device M is capable of mounting a large number of flat filtration membrane plates 1 (see FIG. 4A) upright.
A filter membrane plate holding frame 3 provided with a pair of mounting portions 2, 2,...
And the filter membrane plates 1 are erected on the mounting portion 2 so that many filter membrane plates 1 can be arranged in parallel. A rectifying plate 5 (see FIG. 4 (b)) having substantially the same shape as the filtration membrane plate 1 and having no filtering function is attached to each of the five pairs at both ends of the mounting portions 2, 2,. , Each of the 40 pairs on the central side of the mounting portions 2, 2,...
The filtration membrane plate 1 is attached (see FIG. 1), each membrane separation device is provided with a membrane separation function for 40 filtration membrane plates 1, and the membrane separation tank E2 is provided with 80 filtration membrane plates. Water treatment capacity. Further, a set of legs 4 for supporting the filtration membrane plate holding frame 3 is provided below the filtration membrane plate holding frame 3, and air bubbles are supplied to the filtration membrane plate 1 between the leg portions 4. Further, an air diffuser D for supplying oxygen to the water to be treated while preventing a sludge or the like from adhering excessively to the membrane surface and forming a circulating flow in the membrane separation tank E2 is provided therein. Also,
Each filtration membrane plate 1 of the membrane separation device M has an intake pipe 6
And a water collecting pipe 7 for joining filtered water from the water intake pipe 6 and guiding the filtered water to the outside of the membrane separation tank E2.
The membrane separation tank E2 is located below the water surface of the membrane separation tank E2.
Is connected to a discharge pump tank T adjacent to the tank.

The discharge pump tank T comprises a disinfecting tank Q1 and a storage tank Q2. The disinfecting tank Q1 has a treated water receiving container on a partition separating the membrane separation tank E2 and the discharge pump tank T. It is configured by providing a small hole in the wall surface,
The filtered water that has flowed into the disinfection tank Q1 flows into the storage tank Q2 after being disinfected. The storage tank Q2 is provided with a discharge pump P
4, and the treated water once stored in the storage tank Q2 is pumped up by the discharge pump P1 and can be discharged from the discharge port Z to the outside of the purification tank via the discharge pipe A5. Thereby, the disinfected treated water is almost quantitatively discharged from the storage tank T to the outside of the purification tank.

[0015]

EXAMPLE When the septic tank in the above-described embodiment was operated in a steady state, the water to be treated circulated as indicated by the arrow in FIG. 2 so that substantially uniform air bubbles could be supplied to all the filtration membrane plates. At the same time, the water to be treated is supplied almost uniformly,
The situation where the solid-liquid separation treatment was performed in a well-balanced manner was realized.

[Other Embodiment] Another embodiment will be described below. The current plate may be made of an iron material, and by being made of an iron material, from the magnitude of its specific gravity,
Rattling of the current plate can be reduced, and
With the elution of the iron material into the water to be treated, trivalent iron ions exert a function of precipitating and removing the phosphorus component in the water to be treated, and not only a rectifying action, but also a function of assisting biological treatment of the water to be treated. It is convenient because it is shown. As for the removal of the precipitate of the phosphorus component, the function can be sufficiently exhibited if the rectifying plate is formed from a plate-like body in which an iron material is provided in an exposed state.

For example, when the number of filtration membrane plates required for the septic tank is 120, a membrane separation tank capable of arranging three membrane separation devices in parallel as a septic tank main body is provided. Separation tanks equipped with three membrane separators each having 40 filtration membrane plates and 10 rectifying plates are installed, and water treatment capacity for 120 sheets is provided. The rectifying plates may be disposed at each end of the membrane separation device in units of five. Further, even when the number of filtration membrane plates required for the septic tank is variously changed, the rectification plates are provided for each of the membrane separation devices. What is necessary is to disperse and arrange on both ends.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing circulation of water to be treated in a water treatment layer provided with the membrane separation device of the present invention.

FIG. 3 is a plan view showing a state in which a filtration membrane plate is provided in the membrane separation device.

FIG. 4 is a comparison diagram of a filtration membrane plate and a rectifying plate.

[Description of Signs] 1 Filtration membrane plate 2 Mounting part 4 Rectifier plate

Continued on the front page (72) Inventor Masaharu Iwahashi 2 at Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Inside the Kubota Shiga Plant (72) Katsumi Hamada, 2nd Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture In the Kubota Shiga Plant (72) Inventor Shinichi Furuse 2 in Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture In the Kubota Shiga Plant (56) References JP-A-9-220448 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B01D 61/00-65/10 C02F 1/44

Claims (2)

(57) [Claims] 1. A membrane separation device in which a number of mounting portions to which a filtration membrane plate can be mounted are arranged in parallel, wherein a rectifying plate not performing a membrane filtration process is provided in the mounting portion, and the rectifying plates are arranged in parallel. Membrane separation devices distributed on both ends in the direction of juxtaposition of the sections. 2. The membrane separation device according to claim 1, wherein the rectifying plate is formed from a plate-like body in which an iron material is provided in an exposed state.