KR102018808B1 - A pressurized membrane module with superior flow distribution of feed water and backwashing water - Google Patents

Abstract

Disclosed is a pressurized membrane module having a distribution plate provided at a raw water inlet and a backwashing inlet to provide excellent flow distribution between raw water and backwash water.
The pressurized membrane module according to the present invention includes a plurality of membranes for filtering raw water or passing backwash water during washing, and a first back washing inlet for introducing backwash water during washing, and a second backwashing. A cylindrical pressurized membrane module body including a inlet portion; An upper cap disposed above the pressurized membrane module body, wherein the filtered product water is discharged or includes a product water outlet and a third backwash inlet through which backwash water is introduced; And a lower cap disposed below the pressurized membrane module main body, wherein the raw water flows in, or the raw water inflow portion and the backwash water discharge portion are discharged when the backwash water is discharged, and the first backwashing inlet portion. The second backwashing inlet, the production water outlet and the third backwashing inlet, the raw water inlet and the backwash water outlet are provided with a distribution plate inside the passage to distribute the flow rate of the raw water and the backwash water evenly. It is characterized by.

Description

PRESSURIZED MEMBRANE MODULE WITH SUPERIOR FLOW DISTRIBUTION OF FEED WATER AND BACKWASHING WATER}

The present invention relates to a pressurized membrane module, and more particularly, to a pressurized membrane module having a distribution plate provided at a raw water inlet portion and a backwashing inlet portion of the pressurized membrane module, and having excellent flow distribution of raw water and backwash water. .

In general, a device for water purification by treating raw water containing contaminants, and a membrane used in a water purification device or a wastewater treatment device for separating and filtering contaminants may include a microfiltration microfiltration membrane having a pore size of 0.1 to 0.5 μm. It is divided into ultrafiltration membranes of 0.001 to 0.1 µm fine pores. If this is classified according to the form of membrane, it can be classified into flat membrane in the form of plate and hollow fiber membrane in the form of thread. In addition, classification according to the type of water treatment using membrane can be divided into submerged membrane module water purification device used by being deposited inside the contaminated water tank and pressurized membrane module water purification device which is fixed inside the pressure vessel and pressurized the contaminated water. have.

Conventional membrane modules concentrate the inlet pressure at a certain portion as the influent and backwash water with a strong hydraulic pressure of an average of 1 bar from the narrow feedwater inlet and about 3-7 bar from the backwash inlet enter the interior of the relatively wide membrane module. Phenomenon occurs. This may cause problems such as single shot of the membrane or local membrane contamination. Accordingly, studies are being conducted in which various types of modules are attached to distribute the inflow water evenly before the inflow water introduced through the membrane inflow pipe reaches the membrane.

However, these modules are the cause of lowering the inlet pressure to increase the differential pressure, there is a disadvantage that the complex and additional modules must be installed in the existing module.

Republic of Korea Patent Publication No. 10-1625603 (announced on May 31, 2016) discloses a hollow fiber membrane fixing module and a water purification device having the same.

It is an object of the present invention to provide a pressurized membrane module having excellent flow distribution of raw water and backwash water.

Pressurized membrane module according to the present invention for achieving the above one object comprises a plurality of membranes for filtering the raw water, or to pass the backwashing water at the time of washing, the first backwashing (pore washing) into which the backwashing water is introduced during washing A cylindrical pressurized membrane module body including an inlet and a second backwashing inlet; An upper cap disposed above the pressurized membrane module body, wherein the filtered product water is discharged or includes a product water outlet and a third backwash inlet through which backwash water is introduced; And a lower cap disposed below the pressurized membrane module main body, wherein the raw water flows in, or the raw water inflow portion and the backwash water discharge portion are discharged when the backwash water is discharged, and the first backwashing inlet portion. The second backwashing inlet, the production water outlet and the third backwashing inlet, the raw water inlet and the backwash water outlet are provided with a distribution plate inside the passage to distribute the flow rate of the raw water and the backwash water evenly. It is characterized by.

The distribution plate may be a distribution plate in which two or more plate shapes are crossed at the center.

The distribution plate may be a distribution plate in which two or more tubular shapes having different diameters are disposed.

The distribution plate in which the two or more plate shapes intersect at the center may be formed to extend to an area of the upper cap or the lower cap, and a cone shape may be formed at an extended end thereof to have a larger diameter toward the pressurized membrane module body.

The distribution plate having two or more tubular tubes having different diameters may be extended in the shape of a cone having a diameter larger toward the pressurized membrane module main body at one end close to the pressurized membrane module main body.

Pressurized membrane module according to the present invention is the raw water inlet (raw water inlet and backwash water outlet) and backwash water inlet (first backwash inlet, second backwash inlet, production water outlet and As the distribution plate is installed in the third backwashing inlet, the flow rate of the raw water and the backwash water is uniformly distributed, so that the raw water and the backwash water can be uniformly passed through the entire area of the membrane module.

Accordingly, the flow rate of the raw water and the backwash water is kept constant in the pressurized membrane module, thereby solving problems such as disconnection or deterioration of the membrane.

1 is a cross-sectional view of a pressurized membrane module according to the present invention.
2 is a cross-sectional view of the upper cap, the pressurized membrane module main body and the lower cap of the pressurized membrane module according to the present invention.
Figure 3 shows the type of distribution plate (case 1, case 2) according to the present invention.
4 schematically shows the flow of raw water in a pressurized membrane module with and without a distribution plate.
Figure 5 shows the internal view of the raw water inlet and backwash water outlet 31 is installed with a pressurized membrane module and the distribution plate (case 1, case 2) is not installed.
6 is a graph showing the flow rate of the raw water inlet (raw water inlet and backwash water outlet 31) top plate of the pressurized membrane module with or without the distribution plate (case 1, case 2).

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a pressurized membrane module having excellent flow rate distribution of raw water and backwash water according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The pressurized membrane module according to the present invention is a pressurized membrane module of a type in which pressurized raw water is introduced into the membrane module and filtered by the membrane. The permeation method can be used in both the In-Out method in which raw water enters the membrane and transmits to the outside, and the Out-In method in which raw water enters the membrane and transmits to the inside. 1 to 3, the pressurized membrane module according to the present invention includes a pressurized membrane module body 10, an upper cap 20, and a lower cap 30. At this time, the raw water inlet and backwash water outlet 31 through which the raw water is introduced, the first backwash inlet 14, the second backwash inlet 15, and the production water outlet and the first backwash water are introduced. It is characterized in that the distribution plate is installed in the inlet 21 for backwashing.

Pressurized membrane module body (10)

The pressurized membrane module main body 10 includes a cylindrical container 11 and a plurality of membranes 12 contained in an inner space of the cylindrical container 11. The material of the cylindrical container 11 is not particularly limited, but may be formed of a resin such as polyvinyl chloride (PVC), acrylonitrile butadiene styrene copolymer (ABS) in consideration of productivity, cost, light weight, and durability. have. The plurality of membranes 12 serves to filter raw water or to pass backwashing water upon cleaning. The length of the membrane can be adjusted according to the size of the outer shape of the pressure-sensitive membrane module body 10, may be approximately 1 ~ 5m. The membrane is preferably porous, and may be formed of an organic material such as polyvinylidene fluoride (PVDF), polypropylene (PP), polyethylene (PE), or an inorganic material such as ceramic. Preferably, it may be formed of a polyvinylidene fluoride (PVDF) -based material in view of the strength of the film. The diameter of the pores included in the surface of the membrane may be approximately 0.0001 ~ 1㎛. The outer diameter of the membrane may be 0.5 to 2 mm so as to have high fluctuation of the membrane and excellent cleanability, and the inner diameter may be 0.3 to 1 mm.

Since both end portions of the plurality of membranes 12 must be fixed inside the module body 10, they may be adhesively fixed by the adhesive portions 13a and 13b of the membrane and the module. The material of the adhesive parts 13a and 13b of the membrane and the module may be a thermosetting resin such as an epoxy resin or a urethane resin.

The adhesive part 13a at the upper side of the membrane module may be closed or opened according to an operation method.

The first backwashing inlet 14 and the first backwashing inlet 15, through which backwash water flows, are formed at the upper end of the side surface of the pressurized membrane module body 10.

1 to 2, the first backwashing inlet 14 and the first backwashing inlet 15 are formed in a passage like a conduit, in which a distribution plate is installed. It is preferable to distribute the backwash water evenly.

The distribution plate may be designed in two types, as shown in FIG. 4, in which two or more plate shapes intersect at the center (case 1), or two or more tubular shapes having different diameters ( case 2).

In the case where two or more plate shapes intersect at the center, for example, when two plate shapes intersect at the center, the inside of the passage is divided into four regions, and when three plate shapes cross at the center, the inside of the passage is divided into six regions. Divided.

In addition, the distribution plate in which the two or more plate-shaped cross in the center is formed to extend to the area of the upper cap 20 or the lower cap 30, the diameter is wider toward the pressurized membrane module main body 10 side at the extended end The losing cone shape can be formed.

In the case where two or more tubular shapes having different diameters are arranged, two or more hollow cylinders, such as a barrel shape, may be arranged, and the inside of the passage may be divided by the tubular having different diameters. For example, a first tubular shape may be disposed in the passage, and a second tubular shape having a smaller diameter than the first tubular shape may be disposed in the first tubular shape.

In addition, the distribution plate having two or more different tubular shapes having different diameters may be extended in a cone shape in which a diameter of the tubular body is widened toward the pressurized membrane module main body 10 at one end close to the pressurized membrane module main body 10. .

As such, a distribution plate may be installed in the first backwashing inlet 14 and the second backwashing inlet 15 of the pressurized membrane module to distribute the flow of backwash water, which is a high inlet pressure of the backwashing water. By equally distributing the water pressure applied to the membrane by not reducing the water pressure, there is an effect of not lowering the differential pressure. In addition, simply installing a distribution plate on the first backwashing inlet 14 and the second backwashing inlet 15 may not increase the facility investment cost significantly, thereby increasing the possibility of commercialization.

The pressure of the backwash water flowing into each of the first backwashing inlet 14 and the second backwashing inlet 15 may be approximately 3-7 bar.

Upper cap (20)

The upper cap 20 is disposed on the pressurized membrane module main body 10 to be detachable, and the third backwashing is performed so that the filtered water from the pressurized membrane module main body 10 is discharged or backwashed water is introduced. And an inlet and a product water outlet 21. The third backwashing inlet and the production water outlet 21 may be formed in an upper region and a central region of the upper cap 20.

As described in the first backwashing inlet 14 and the second backwashing inlet 15, the distribution plates installed in the third backwashing inlet and the product water outlet 21 are 2 It is preferable to design in different types, and description of the distribution plate will be omitted.

The pressure of the backwash water flowing into the third backwashing inlet and the production water outlet 21 may be approximately 3-7 bar.

Lower cap (30)

The lower cap 30 is disposed below the pressurized membrane module main body 10 and is detachable. The lower cap 30 may include a raw water inlet and a backwash water outlet 31 so that backwash water is discharged when the raw water is introduced or washed.

1 and 2, the raw water inlet and the backwash water outlet 31 are formed in a passage like a pipeline, and the distribution plate is installed inside the passage to distribute the flow of raw water evenly. desirable.

As described above, the distribution plate is preferably designed in two types, and description of the distribution plate will be omitted.

The pressure of the raw water flowing into the raw water inlet and the backwash water outlet 31 may be approximately 0.5 to 1.5 bar.

4 schematically shows the flow of raw water in a pressurized membrane module with and without a distribution plate. Figure 5 shows the internal view of the raw water inlet and backwash water outlet 31 is installed with a pressurized membrane module and the distribution plate (case 1, case 2) is not installed.

4 and 5, it can be predicted that the raw water inlet and the backwash water outlet without the distribution plate installed are in the form of dispensing raw water from the point where the raw water is attached to the membrane.

6 is a graph showing the flow rate of the raw water inlet (raw water inlet and backwash water outlet 31) top plate of the pressurized membrane module with or without the distribution plate (case 1, case 2).

When the distribution plate is not installed in the raw water inlet and the backwash water outlet 31, the raw water flows in the center of the pressurized membrane module (sections 1 to 3) with the fastest flow rate, and the average water flow rate is 0.364. m / s.

When the distribution plate (case 1) is installed in the raw water inlet and the backwash water outlet 31, the flow velocity is high in the center, but the raw water is also distributed in the middle portions (sections 4 to 7), and the terminal portions (sections 8 to 9). ), The flow rate was evenly distributed. The average flow rate was 0.299 m / s.

When the distribution plate (case 2) is installed in the raw water inlet and the backwash water outlet 31, the flow rate is uniformly distributed in all sections (sections 1 to 9). The average flow rate was 0.192 m / s.

As shown in the above results, the flow rate was the fastest when no distribution plate was installed, because the flow rate was heavily biased to the center, showing a very high flow rate only at that point, and the overall average flow rate was high.

In contrast, when distribution plates were installed (case 1, case 2), the distribution of flow rates was uniformly maintained at all points and the average flow rate was kept low.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments and can be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

10: pressurized membrane module body
11: cylindrical container
12: plural films
13a, 13b: bonding portion of membrane and module
14: inlet for the first backwash
15: second backwash inlet
20: upper cap
21: third backwash inlet and production water outlet
30: lower cap
31: raw water inlet and backwash water outlet

Claims (5)

Cylindrical pressurization including a first poring inlet and a second backwashing inlet, comprising a plurality of membranes for filtration of raw water or for passing backwashing during washing, and a backwashing inlet for washing; Membrane module body;
An upper cap disposed above the pressurized membrane module body, wherein the filtered product water is discharged or includes a product water outlet and a third backwash inlet through which backwash water is introduced; And
And a lower cap disposed below the pressurized membrane module body, wherein the raw water flows in, or includes a raw water inlet and a backwash water outlet through which backwash water is discharged.
In order to distribute the flow rate of the raw water and the backwash water evenly, the first backwashing inlet, the second backwashing inlet, the production water outlet and the third backwashing inlet, raw water inlet and backwash water Pressurized membrane module, characterized in that the distribution plate is installed inside the outlet.
The method of claim 1,
The distribution plate is a pressurized membrane module, characterized in that two or more plate-shaped distribution plate in the center intersected.
The method of claim 2,
The distribution plate in which the two or more plate shapes intersect at the center is formed to extend to an area of the upper cap or the lower cap, and a cone shape is formed in which the diameter is widened toward the pressurized membrane module main body at an extended end. Pressurized membrane module.
The method of claim 1,
The distribution plate is a pressurized membrane module, characterized in that the distribution plate is arranged two or more different in diameter.
The method of claim 4, wherein
The distribution plate having two or more different tubular shapes having different diameters may extend in a cone shape in which a diameter of the tubular tube is widened toward the pressurized membrane module main body at one end close to the pressurized membrane module main body.

Images