JPS61293504A - Separation device utilizing hollow yarn membrane - Google Patents

Abstract

PURPOSE:To remove contaminants sticking to the external surface of hollow yarn effectively, by fixing a holding plate provided with a fitting port surrounding a foot end of each filter module, and providing also a downwardly directed cylinder to an external edge of a bottom surface of the holding plate. CONSTITUTION:Many holes arranged coincidently to filter modules 5 are bored to a separating plate 2 and a holding plate 6, and a short cylindrical piece is fitted as fitting piece 15 to each hole of the holding plate 6. A foot end board 14 of the module 5 is fitted to the fitting piece 15 and the top end is fixed to the hole in the separating plate 2. In the stage of washing of the module 5, air is fed to the inside part surrounded by lower cylinders 8 of the holding plate 6 through an air feeding pipe 9. Almost whole amt. of the air is introduced evenly into the inside of the module 5 from through holes 14' on the foot end board 14, then, raised upward among the hollow yarns 12 removing thereby contaminants sticking to the external surface of the hollow yarn. By this method, flushing is performed efficiently in a short time with small amt. of air.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a hollow fiber type membrane separation device using hollow fibers.

(Prior art) A filtration module is constructed by providing a partition plate at the top of the treatment tower, using a stopper on the partition plate as a water collection chamber, and a treatment chamber at the bottom, and converging a large number of hollow fibers in a porous protective cylinder. A large number of filtration modules are suspended in the processing chamber with their upper ends fixed to the partition plate, and the raw water supplied into the processing chamber is filtered by the outer surface of the hollow fibers constituting each filtration module, and the treated water is filtered through the hollow fibers. An external pressure filtration type hollow fiber type membrane separation device that obtains water into the water collection chamber through a hollow interior is conventionally known.

When filtration is performed using the above device, as time passes, suspended matter in the raw water is captured and attached to the outer surface of the hollow fibers, and the filtration differential pressure gradually increases, reducing the filtration efficiency. At any time, the entire filtration is interrupted, air is blown into the processing chamber from below, and this air and water in the processing chamber are used to remove suspended matter adhering to the outer surface of each hollow fiber that makes up each filtration module (flushing). ] Then, it is necessary to carry out cleaning to remove the separated suspended solids from the processing chamber by extracting water from the processing chamber to the outside of the tower.

(Problem to be solved by the invention) However, in the conventional device, even if air is blown into the processing chamber from below for cleaning, air bubbles float up in the adjacent spaces between the filtration modules suspended from the partition plate, causing the porous Surrounded by a protective tube, the filter enters the inside of the module and rarely acts on the outer surface of the individual hollow fibers that make up the filtration module. , and the power cost for supplying air also increases.

(Means for Solving the Problems) Therefore, the present invention fixes a holding plate provided with a fitting opening that surrounds the lower end of each filtration module at a distance downward from the partition plate, so that the fitting opening can be connected to each filtration module. A cylindrical portion that fits into the lower end of the holding plate and faces downward along the outer edge of the lower surface of the holding plate is provided, and an air supply pipe that supplies cleaning air to the interior surrounded by the cylindrical portion is provided at the lower part of the processing chamber. It is characterized by

(for production) Filtration can be performed similarly to conventional devices.

During cleaning, when air is supplied into the processing chamber from the air supply pipe, air bubbles are surrounded by the cylindrical part under the holding plate and gather inside the chamber, and are fitted into the respective fitting holes of the holding plate to open the inside of the filtration module from the lower end of the filtration module. It floats up, adheres to the outer surface of the hollow fibers constituting the filtration module, and effectively peels off fcgA'X.

(Embodiment) In the illustrated embodiment, / is a treatment tower, K is a partition plate provided at the upper part of the treatment tower, dividing the upper part into a water collection chamber 3, and the lower part into a treatment chamber group, S... is a large number of filtration modules suspended in the processing chamber, 6 is a holding plate, li is a stay for fixing the above-mentioned holding plate away from the bottom of the partition plate, g is A cylindrical portion is provided on the outer edge of the lower surface of the holding plate ``d'', D is surrounded by the cylindrical portion f'Lfc, and an air pipe for supplying all of the cleaning air into the inside, 10 is at least the cylindrical portion provided on the lower surface of the holding plate B. Is it the same as or is the water pipe installed downward and longer than the IL?

Each filtration module has a porous protection tube/l, a large number of hollow fibers/coats converged inside the protection tube, and protection in which the protection tube and the upper and lower ends of the hollow fibers are adhesively bonded. It consists of an upper end plate /J and a lower end plate IQ whose outer diameter is larger than that of the cylinder.

Both panels above / 3.1tii1: Made of a cylindrical plastic outer frame and an adhesive layer such as epoxy resin that is filled into this outer frame and hardened to bond the protective tube and each end of the hollow fiber. n
, the upper part of each NFC hollow fiber condensed inside the protection tube passes through the upper end plate/, 3F and opens on the upper surface of the upper end plate, and the lower end is connected to the lower end plate in the same way as each end of the protection tube. It is filled with adhesive layer in ll. In addition, the lower end board/da is hollow fiber/2 = 0. There are vertical through holes /q' at adjacent intervals.

Holes arranged in the same manner as the filtration modules are provided in the partition plate 3 and the holding plate 3 at the 9th point where each filtration module 3 is attached, and in this embodiment, the holes in the holding plate are provided with fitting holes/! Attach five short cylinders with the inner diameter of the upper part expanding upward, lower each filtration module S into the processing chamber through the hole in the partition plate, and fit the lower end plate ″/4tf perfectly into the fitting opening 15 above. In this state, the upper end of each filtration module is appropriately fixed in the hole of the partition plate.For example, as shown in the figure, an annular groove λ/ is formed on the outer periphery of the upper end plate of each filtration module. two semicircular rings, 2.2, - radially inward pawls 2;
2' Insert the annular groove into the upper part of the upper end plate above the annular groove with both rings, and insert both rings into the step stop on the lower surface of the large diameter upper half of the hole in the partition plate. Stopper (the lower part of the annular groove of the upper end plate i4I fits airtightly into the lower half of the small diameter hole of the partition plate with an O-ring.), the upper end plate of both rigs protrudes upward from the upper end plate/3, and then the upper end It is sufficient to match the top surface of the partition plate with the top surface of the partition plate, abut the plate 3 from above the partition plate, and screw the plate 3 to the partition plate to make it removable. Although the arrangement is the same as that of the module, there is a water flow row 3' that is smaller than the semicircular ring.Also, it is necessary to remove the plate 2J and pull out the filtration module upward, or conversely, lower it into the processing chamber. In order to facilitate this, it is preferable that each semicircular ring n is provided with a handle t41 by welding both ends of the rod in the diametrical direction so that the handles, 2 and 41 of both rings can be grasped together.

If necessary, a multi-hole guide cylinder /6 may be provided whose upper end abuts the lower surface around the hole of the partition plate and whose lower end fits into the outer periphery of the upper half of the cylinder constituting the fitting opening /j. . Further, it is preferable that one or more holes be provided around the lower half of the tube.

To perform filtration, raw water is supplied into the processing chamber q from the bottom port/l. As a result, raw water flows through the through hole IQ' of the lower end plate /q, the guide tube /6, and the protection tube 7 inside each filtration module 5.
The water enters through the hole in the hollow fiber, passes through the tube wall of the hollow fiber, collects in the water collection chamber 3 through the hollow part of each hollow fiber, exits from the opening 9 at the top of the processing tube, and the hollow fiber passes through the tube wall of the hollow fiber. Suspended matter in the raw water is captured and gradually adheres to the outer surface of the tank.

When the filtration differential pressure rises due to suspended matter adhering to the outer surface of the hollow fiber, filtration is interrupted and cleaning is performed.

There are various ways to create the RVc, but in any case, open the valve of the exhaust pipe connected to the air outlet J, and supply air with the air supply pipe to the inside surrounded by the cylindrical part t below the retaining plate O. supply.

As a result, air enters the inside of each module equally from the through hole/4I' of the lower end plate/l of each filtration module j, and when it floats in the form of air bubbles between the hollow fibers l, the water It works together with the hollow fibers to peel off the suspended solids that adhere to the outer surface of the hollow fibers.

Most of the air supplied by the air pipe 9 is in the cylindrical part t.
It floats under the n-th holding plate surrounded by the filtration module, passes through the through hole in the lower end plate of each filtration module, and rises inside the module. Therefore, it can be used extremely efficiently and in a short period of time with a small amount of air.
Lashing can be performed. The air that has risen above the water surface in the processing chamber is then exhausted from the air outlet J to the outside of the tower.

After flushing in this way, stop the air supply,
The water in the treatment chamber and the separated suspended solids are discharged to the outside of the treatment tower through the mouth as cleaning wastewater.

In this case, retaining plate A has an outer diameter smaller than that of partition plate A.
This impedes the flow of water during both filtration and backwashing, but by providing several water pipes 70 at intervals between the weirs of the filtration module 5, the water pipes 10f can be connected to the water on the retaining plate 6. Since water can be drained downward and water can be passed through during filtration, there is no problem. In order to prevent air from passing through the water pipe 10 and rising above the gap between the p-passage modules S during flushing, the downward length of the water pipe IO is set to be equal to the length of the cylindrical portion S as described above. , leave it longer than son.

In addition, the suspended solids separated from the outer surface of the hollow fibers of each filtration module may accumulate together with water in the fitting opening 15 on the inner circumference of the cylinder that meets the lower end of the module.
This can be prevented by opening a . That is, this hole /7 is fitted with the inner circumference VC of the cylinder, and then the lower end plate /4 of each filtration module 3 is fitted.
This is because it is connected to the top of the n* fitting opening and is blocked by the lower end plate IQ, and is discharged onto the holding plate 6 together with the water and gold suspended solids that would remain inside the n* fitting opening.

In this way, once all the water in the processing chamber DA has been drained from the lower g, filtration is restarted. When the filtration module reaches the end of its lifespan and needs to be replaced, cover the water collection chamber J, remove the top wall 3', remove the filtration module together with the partition plate, and replace the retaining plate 10't-
It can be extracted from the treatment tower and handled.

(Effects of the Invention) As described above, according to the present invention, the entire amount of air supplied into the processing chamber l by the air supply pipe is floated inside the entire filtration module! It can be used to peel off the material. Therefore, compared to conventional methods, the amount of air supplied can be reduced and flushing can be performed efficiently in a short time. In addition, all parts are fixed to the partition plate. This makes it easy to attach and detach from the cylinder, making maintenance more efficient.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a schematic sectional view of the whole, and Fig. 2 is an enlarged sectional view of the main parts of the same. board, 3 is a water collection chamber, da is a processing chamber, S is a filtration module, 6 is a holding plate, g is a cylinder part, 9
15 indicates an air supply pipe, and 15 indicates a fitting port. Patent attorney Fuku 1) Nitoshi...
5. , 21. .

Claims (2)

[Claims] (1) A partition plate is installed at the top of the treatment tower, the top of the partition plate is used as a water collection chamber, and the bottom part is used as a treatment chamber. A large number of filtration modules are fixed to the partition plate and suspended within the processing chamber,
In the hollow fiber membrane separation device, the raw water supplied into the treatment chamber is filtered by the outer surface of the hollow fibers constituting each filtration module, and the treated water is obtained into the water collection chamber through the hollow interior of the hollow fiber. By fixing a holding plate having a fitting opening into which the lower end of the filtration module is fitted downwardly to the partition plate, the lower end of each filtration module is fitted into the fitting opening, and the lower end of each filtration module is fitted downward along the outer edge of the lower surface of the holding plate. A hollow fiber type membrane separation apparatus characterized in that a cylindrical part is provided, and an air supply pipe for supplying cleaning air to the inside surrounded by the cylindrical part is arranged in the lower part of the processing chamber. (2) A hollow fiber membrane separation device according to claim (1), in which a water pipe having a downward length equal to or longer than the cylindrical portion is attached to the holding plate.