KR20030042730A - A spiral wound membrane module - Google Patents

Abstract

PURPOSE: A spiral wound membrane module whose life cycle and efficiency are extended and improved respectively by varying simple inflow current of supply water in forward and reverse directions, thereby reducing contamination of the membrane and improving cleaning efficiency of the membrane at the same time is provided. CONSTITUTION: In a spiral wound membrane module comprising catchment pipe which is housed in hollow cylindrical pressure container to flow out filtrate and centrate to the other side of the pressure container by separating supply water flown in from one side of the pressure container into filtrate and centrate respectively, and wound membrane, the spiral wound membrane module is characterized in that O-ring members(3,4) comprising close adherence vanes(3a,4a) are respectively formed at front and rear ends of module main body(1a) so that the close adherence vanes(3a,4a) seal the space therebetween to prevent the supply water from passing through a space between the outer circumferential surface of the module main body(1a) and the inner circumferential surface of the pressure container, wherein the close adherence vanes(3a,4a) are opened outward when they correspond to inflow direction of the supply water so that the end part of the close adherence vanes(3a,4a) are contacted with the inner circumferential surface of the pressure container, wherein at least one or more modules(1) are installed inside the pressure container, wherein supply water line on which first valve is installed, centrate line on which second valve is installed, filtrate line, reverse directional supply water line on which third valve is installed, and which is connected between the supply water line and filtrate line, and reverse directional concentration line on which fourth valve is installed are installed in front and rear of the pressure container, and wherein the membrane is selected from reverse osmotic membrane, nano-filtration membrane, ultrafiltration membrane and microfiltration membrane.

Description

Spiral wound membrane module {A SPIRAL WOUND MEMBRANE MODULE}

The present invention reduces the contamination of the membrane by varying the simple inflow of the feed water in the forward and reverse directions, and at the same time to improve the cleaning efficiency of the membrane to extend the service life of the membrane, to improve the efficiency of the module spiral wound membrane module It is about.

Generally, pure water manufacturing process for manufacturing washing water to clean semiconductors and supply water to boilers, desalination of seawater to secure alternative water resources, and advanced sewage and wastewater treatment for reuse of domestic and industrial wastewater as water. In many water treatment fields such as processes, the use of membrane modules is increasing rapidly.

That is, the membrane module serves to accommodate the pressure of the feed water and to separate the flow of the feed water and the permeate water by sandwiching the flat membranes together to facilitate the application in the actual process and to increase the effective membrane area. The membrane module is usually manufactured hydrodynamically to minimize the concentration polarization by controlling the flow rate and vortex of the feed water.

These membrane modules have been developed and commercialized in various types of modules, such as flat panel module, spiral wound module, tubular module, hollow fiber module, etc., depending on their shape. The winding module is the most widely used.

1 is a configuration diagram showing a typical spiral wound membrane module, as shown, the spiral wound membrane module 10 is a permeate carrier (permeate carrier) made of a woven fabric such as a tricot fabric separator 11 is a rectangular flat membrane (12) sandwiched and sandwiched so that the active layer surfaces of the membranes are opposite to each other, the sandwiched membranes are spirally wound around the hole-shaped cylindrical water collecting tube (13).

At this time, the surface of the separator 11 is protected by a polypropylene mesh (feed water space), which not only protects the active layer but also increases vortex at the surface of the membrane to promote mass transfer and reduce concentration polarization.

Then, in order to permeate the feed water through the separation membrane to separate the treated water and the concentrated water, three surfaces such as a membrane-permeate-water-sandwich and the like are sealed with an adhesive, and the other side is opened with a collecting pipe 13 so that only the permeate is opened. To get out.

On the other hand, such spiral wound membrane module 10, as shown in Figures 2 and 3, the outer circumferential surface of the membrane 11 wound on the collecting pipe 13 is wrapped with a glass fiber wrap 14, the supply end An o-ring member 15 made of rubber material having a contact blade 17 extended from the body so as to be opened outwardly by the inflow flow when water is introduced, and an end plate 16 is installed at the rear end.

In addition, the module 10 is used in the pressure vessel 20 of the hollow-cylindrical cylinder, and generally two to six modules are collected in the collection pipe 13 of the module 10 in one pressure vessel 20. It was used by connecting in series via a tube tube 18 to connect between.

That is, in the spiral wound membrane module 10, since the O-ring member 15 is located in front of the feed water inflow, the feed water flows into the cylindrical pressure vessel 20 containing the module 10. When the contact blade 17 of the O-ring member 15 is lifted outward by the inflow pressure of the feed water, the end thereof is in close contact with the inner circumferential surface of the pressure vessel 20. Accordingly, the incoming feed water does not remain in the pressure vessel 20 but flows through the module 10 at a constant flow rate and separates pure water and foreign substances while passing the feed water through the separator.

At this time, the treated water is collected into the tube tube 18 connecting between the collection pipes 13 of the module 10 in the pressure vessel 20, and then flows into the second module 10 through the two. The close wing 17 of the O-ring member 15 mounted at the front end of the module 10 is opened to the outside by the inlet pressure of the feed water flowing into the second module 10 to be in close contact with the pressure vessel 20. The treated water passing through the separator of the module in the state is discharged to the outside through the collecting pipe 18, the supply water is concentrated water to be discharged to the outside of the system.

In this process, the fouling phenomenon of the membrane gradually increases while the feed water passes through each module, and the pressure decreases, which causes the driving force of the separation to be reduced. A major obstacle is membrane fouling.

If a certain time passes in the process of adopting the membrane module, fine particulate matter or the like adheres to the membrane surface, increasing the operating pressure and decreasing the permeate flow rate so that water cannot be passed anymore. The chemicals were supplied with feed water to wash the adhered material to restore membrane performance.

The spiral wound membrane module developed so far is designed to allow the feed water to flow in one direction due to the flow characteristics of the feed water. When several modules are connected in series in the pressure vessel, the module at the front end where the feed water flows in one direction first passes first. There was a problem of deterioration of the permeation performance due to contamination.

Most of the technologies related to membrane modules in Korea are imported and used in foreign countries. In some cases, attempts have been made to develop modules with excellent flow characteristics and low operating pressure. Very little research has been done on the development of modules that supply the system.

Meanwhile, the related arts related to spiral wound module development include Korean Patent Publication No. 93-21166 (name: spiral wound module with excellent membrane separation performance), and Korean Patent Publication No. 96-2114 (name: countercurrent reverse osmosis spiral wound module And a concentrating device for a high concentration solution using the same), domestic patent publication No. 97-69104 (name: spiral wound reverse osmosis membrane module), domestic patent publication No. 2000-21020 (name: manufacturing method of spiral wound separator module), domestic patent publication Although disclosed in No. 2000-36296 (name: spiral wound reverse osmosis module with multileaf), the techniques disclosed in the above publications relate to an efficient module by partially improving existing module characteristics.

In addition, Korean Patent Publication No. 96-21114 (name: countercurrent reverse osmosis spiral wound module and a concentrating device of a high concentration solution using the same) discloses a method of concentrating a high concentration solution while reducing membrane fouling, which is a space It is to reduce the osmotic pressure difference by supplying the feed water and the treated water to each other in the countercurrent direction, and to supply countercurrent to the spiral wound membrane module, a separate countercurrent pump must be used. There is a problem that is not economic to use.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of which is to change the simple inflow of the feed water in the forward and reverse directions to reduce the contamination of the membrane and at the same time improve the cleaning efficiency of the membrane It is intended to provide a spiral wound membrane module that can extend its service life and improve the efficiency of the module.

1 is a perspective view showing a general separator module,

Figure 2 is a block diagram showing a spiral wound membrane module according to the prior art,

Figure 3 is a state of use employing a spiral wound membrane module according to the prior art pressure vessel,

Figure 4 is a block diagram showing a spiral wound membrane module according to the present invention,

Figure 5 (a) (b) is a state of use employing the spiral wound membrane module according to the present invention in a pressure vessel,

Figure 6 (a) (b) is a schematic diagram showing an embodiment of a spiral wound membrane module according to the present invention.

Explanation of symbols on the main parts of the drawings

1 ..... Module 1a ..... Module Body

3,4 ... O-ring members 3a, 4b ...

5 ..... Supply Water Line 6 ..... Concentrated Water Line

7 ..... Treated water line 8 ..... Reverse feed water line

9 ..... Reverse Concentration Line 11 .... Membrane

13 .... Collection pipe 20 .... Pressure vessel

As a technical configuration for achieving the above object, the present invention,

In the spiral wound membrane module consisting of a water collecting pipe and a separator wound around the water supply pipe so as to be separated into the treated water and the concentrated water, respectively, which is accommodated in the hollow cylinder-type pressure vessel and flows into one side of the pressure vessel.

Space between the outer circumferential surface of the module body and the inner circumferential surface of the pressure vessel, each having an o-ring member having a close contact with the end portion on the inner circumferential surface of the pressure vessel, which is opened outwardly in correspondence with the inflow direction of the feed water at the front and rear ends of the module body. By providing a spiral wound membrane module characterized in that the sealing so as not to pass through the supply water.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Figure 4 is a block diagram showing a spiral wound membrane module according to the present invention, Figure 5 (a) (b) is a state diagram using the spiral wound membrane module according to the invention employing a pressure vessel, Figure 6 (a) (b) is a schematic diagram showing an embodiment of a spiral wound membrane module according to the present invention.

As shown in Figs. 4 to 6 (a) and (b), at least one or more of the supply water to be treated is disposed in the pressure vessel 20 as shown in Figs. The supply water introduced into the pressure vessel 20 can be processed while flowing in the module 1 without being stopped even if it flows in either direction.

In other words, each side of the module body (1a) consisting of the collecting pipe 13 and the separation membrane 11 wound on the side so that the feed water flowing from one side can be separated into the treated water and the concentrated water, respectively, and flowed out to the other side. O-ring member having a close contact (3a, 4a) in contact with the inner circumferential surface of the pressure vessel 20 is opened to the outside by the pressure of the feed water flowing in each time corresponding to the inflow direction of the feed water flowing from the other side (3) (4) is provided and configured respectively.

Here, the separation membrane 11 may be configured by selecting any one of a reverse osmosis membrane, a nano filter membrane, an ultrafiltration membrane, and a microfiltration membrane.

Accordingly, the space is sealed so as not to pass through the space between the outer circumferential surface of the module body and the inner circumferential surface of the pressure vessel 20 when the water supply flows into the front end or the rear end of the pressure vessel 20.

In addition, a supply water line 5 having a first valve V1 and a second valve at the front and rear ends of the pressure vessel 20 to change the inflow direction of the supply water in a forward or reverse direction. (V2) is provided with a concentrated water line 6 through which the concentrated water is discharged and a treated water line 7 through which the treated water is discharged, and a third valve V3 is provided to provide the supply water line 5 and the treated water line. It comprises a reverse feed water line (8) and a fourth valve (V4) connected between the (6) and the reverse concentration line (9) for the concentrated water is discharged when the feed water reverse supply.

The operation and effects of the present invention having the configuration as described above will be described.

First, when the supply water, which is wastewater, is supplied to one side of the left side of the pressure vessel 20 through the supply water line 5 in which the first valve V1 is opened through the main pump 30, the pressure vessel 20 is provided. Since at least one spiral wound membrane module 1 of the present invention is installed inside the O-ring member 3 assembled at both left and right ends of the module 1 in which the pressure vessel 20 is disposed at the leftmost end. (3), the close wing 3a of the O-ring member 3 at the left end is lifted outward by the inlet pressure of the feed water, as in the prior art, while the inner circumferential surface of the pressure vessel 20 and the outer circumferential surface of the module 1 The gap is sealed so that the feed water does not flow into the gap therebetween.

In this case, the feed water passing through the module 1 of the pressure vessel 20 is separated into concentrated water and treated water by a separation membrane, and the concentrated water is a concentrated water line 6 having a second valve V2 opened. And through the treated water line 7 is discharged to a later process.

At this time, the third valve V3 of the reverse feed water line 8 and the fourth valve V4 of the reverse concentrate water supply line 9 should be closed so as to be made from left to right in the drawing as a forward supply of feed water.

On the other hand, when the constant operation time has elapsed and contamination of the separator constituting the module 1 proceeds, the processing flow rate of the system employing the module 1 inevitably decreases.

In this case, when the operator opens the valve member for supplying the reverse water supply which was closed during the forward operation of the feed water and supplies the feed water to the pressure vessel 20 in the opposite direction to the above, the feed water is supplied from right to left on the drawing. The contacting blade 4a of the O-ring member 4 at the right end of the O-ring members 3 and 4 assembled at the left and right ends of the module 1 disposed at the left and right ends of the pressure vessel 20 is supplied in the reverse direction. While being lifted outward by the inlet pressure of the supply water, the supply water is sealed so that the supply water does not flow into the gap between the inner circumferential surface of the pressure vessel 20 and the outer circumferential surface of the module 1 so that the feed water flows into the module 1. do.

Subsequently, the feed water passing through the separator of the module 1 is separated into concentrated water and treated water so that the concentrated water is through the concentrated water line 9 with the fourth valve V4 opened, and the treated water. Is discharged to the after-process through the treatment water line (7).

When the supply direction of the feed water to be treated as described above is changed in the forward or reverse direction based on the module (1), the membrane contamination proceeds evenly through the entire module (1), the membrane contamination by the fine particles already advanced also in the opposite direction The back-washing effect is naturally removed by the flow rate of the fluid flowing from the to maximize the treatment efficiency.

Hereinafter, the embodiment of the present invention will be briefly described, supplying factory wastewater continuously for 24 hours for 30 days, and accurately treating the processing efficiency of the conventional module 10 and the module 1 of the present invention under the same conditions. For the evaluation, the feed water is the wastewater generated in the factory as raw water, the line 1 adopts the conventional module 10 while the other operating conditions (supply flow rate and operating pressure) remain the same, and the fifth valve A concentrated water line 19 having a V5 was installed, and the line 2 employs the module 1 of the present invention, and has a reverse feed water line 8 and a reverse concentrate so as to switch the feed water flow in the forward and reverse directions. The male line 9 was installed. The module used in this experiment was model number BW-3040, and two modules were placed in the pressure vessel 20.

In this state, as the number of operating days elapsed, the flow rates of the conventional module 1 and the module 1 of the present invention were measured.

That is, for 5 days from the start of operation, the feed water from the main pump 30 is equally supplied to the lines 1 and 2 at 2400 L / hr in the forward direction, and the concentrated water line is maintained at about 20 kg / cm 2. The valves V5 and V2 of (19) and (6) were adjusted. At this time, the third and fourth valves V3 and V4 of the line 2 are closed and the first valve V1 is opened to supply the supply water in the same direction as the line 1.

After 5 days have elapsed, the line 1 in which the conventional module 10 is adopted is left as it is, and the valve 1,2 (V1) V2 is closed in the line 2 in which the module 1 of the present invention is employed, and the third The valve V3 is opened to supply the feed water in the opposite direction to the above, and even in this case, the supply flow rate of the feed water is equally supplied at 2400 L / hr, and the concentrated water line 19 is maintained such that the operating pressure is maintained at about 20 kg / cm 2. ) Valve V5 and the second valve V2 of the reverse concentration water line 9 were adjusted.

The operating pressure and amount of treated water and the quality of the treated water of the two systems operated in this way were measured, and the results are shown in Table 1 below.

Operation time (operation term) Supply water quality (㎲ / ㎝) Line 1 with conventional module Line 2 in which the module of the invention is installed Pressure (㎏ / ㎠) Supply flow rate (L / hr) Treatment flow rate (L / hr) Treatment water quality (㎲ / ㎝) Pressure (㎏ / ㎠) Supply flow rate (L / hr) Treatment flow rate (L / hr) Treatment water quality (㎲ / ㎝) 1 day (forward) 2130 20 2400 440 42.1 20 2400 440 42.0 5 days (reverse direction) 2560 20 2400 400 51.3 20 2400 420 53.1 10 days (forward) 3030 21 2400 340 62.6 20 2400 360 58.4 15 days (reverse direction) 2450 20 2400 260 48.0 21 2400 320 45.9 20 days (forward) 2890 22 2400 200 56.2 21 2400 280 57.8 25 days (reverse direction) 3110 23 2400 120 65.2 22 2400 240 67.0 30 days (forward) 2670 24 2400 40 53.4 22 2400 200 52.1 Warship 1800 2260

As can be seen from Table 1, while the operation time has elapsed, the conventional module has a sharp decrease in the processing flow rate, whereas the module of the present invention has a relatively small decrease in the processing flow rate. In addition, the sum of the total flow rates during the 30-day operation period is 1800L for the conventional module, while the flow rate treated in the module of the present invention was more than 460L as the module of the present invention as 2260L for the module of the present invention. It can be seen that the processing efficiency is improved by 26% compared to the module of.

According to the present invention as described above, by providing the O-ring member having a close contact at each of the left and right ends without significantly changing the structure of the conventional spiral wound membrane module so that the supply of water can be processed irrespective of the supply direction of the supply water By uniformly contaminating the separation membrane, the treated water can be remarkably improved under the same conditions as compared with the conventional module, and the service life thereof can be extended. In addition, since the membrane can be cleaned while changing the cleaning direction during the membrane cleaning operation, the effect of improving the membrane performance recovery rate after the membrane cleaning is obtained.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (4)

The water collecting pipe 13 and the separation membrane 11 wound around the water collecting pipe 13 so as to be separated into the treated water and concentrated water, respectively, which are accommodated in the hollow park cylindrical pressure vessel 20 and flow into the other side. In the spiral wound membrane module consisting of: O-ring members (3) and (4) having contact blades (3a) and (4a), which end portions contact the inner circumferential surface of the pressure vessel (20) to the outside in correspondence with the inflow direction of the feed water at the front and rear ends of the module body (1a). Spirally wound membrane module, characterized in that the supply water to the space between the outer circumferential surface of the module body (1a) and the inner circumferential surface of the pressure vessel (20) so as not to pass. The method of claim 1, Spiral separator module, characterized in that at least one module (1) is installed in the pressure vessel (20). The method according to claim 1 or 2, Lines and rear ends of the pressure vessel 20 are provided with a first valve V1 so as to change the inflow direction of the feed water in a forward or reverse direction, and a supply water line 5 to which supply water is supplied, and a second valve V2. ) Is provided with a concentrated water line (6) through which the concentrated water is discharged and a treated water line (7) through which the treated water is discharged, and a third valve (V3) is provided to provide the supply water line (5) and the treated water line (6). Spiral separator module, characterized in that it comprises a reverse feed water line (8) and a fourth valve (V4) connected between the reverse condensation line (9) and the like concentrated water is discharged when the feed water is supplied reversely. The method of claim 1, The separator 11 is a spiral wound membrane module, characterized in that configured by selecting any one of the reverse osmosis membrane, nano filter membrane, ultrafiltration membrane and microfiltration membrane.