KR101402399B1 - Lower water collecting assembly of pressured membrane module water-purifying apparatus - Google Patents

Abstract

A bottom catchment assembly of a pressurized membrane module purification apparatus is provided.
The present invention provides a pressurized membrane module purification apparatus including a hollow fiber membrane filtration unit disposed in an inner space of a housing having a predetermined length, and an upper header unit having a first outlet port through which concentrated water is discharged and a second outlet port through which product water is discharged A residual water discharging and air supply module connected to the hollow fiber membrane unit and having an outflow inlet for discharging residual water remaining in the hollow fiber membrane filtration unit to the outside and supplied with air for removing impurities; And a lower header portion having an inlet through which the raw water is pressurized, a third outlet connected with the outlet inlet, and a fourth outlet through which the filtered production water passes through the hollow fiber membrane filtration portion.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a submerged water collecting assembly for a pressurized membrane module water purifier,

The present invention relates to a bottom collecting assembly for collecting both ends in a pressurized membrane module water purification apparatus, and more particularly, to a bottom collecting assembly for collecting both produced water filtered through a hollow fiber membrane and the bottom of a housing, A lower water collecting assembly of a pressurized membrane module water purification apparatus capable of reducing the resistance to filtrate raw water versus membrane length, reducing the operation cost by low operating pressure, .

Generally, in a device for purifying raw water impregnated with pollutants, a filtration membrane used in a water treatment plant or a wastewater treatment apparatus for separating and filtering pollutants is composed of a microfiltration membrane of 0.1 to 0.5 micron and a microfiltration membrane of 0.001 And ultrafiltration membranes with micropores of ~ 0.1 micron.

It is divided into a plate type flat membrane and a hollow type hollow fiber membrane according to the membrane type and is immersed in the contaminated water tank according to the type of purified water treatment using membrane, And a pressurized membrane module water purifying apparatus which is used to fix and use the pollution source water.

Here, in order to prevent contamination of the membrane at the lower part of the contamination source water storage tank, the air supply air diffusing tube is installed on the water tank of the immersion membrane module, and the hollow fiber membrane is fixed thereon. And can be operated at a low pressure and can be used for raw water of high turbidity. Thus, it is used not only for wastewater treatment but also for water treatment. However, when the membrane is contaminated, It is difficult to process large-volume and high-flow water purification.

On the other hand, the pressurized membrane module water purifier has a hollow hollow fiber membrane inside a cylindrical pressure vessel to pressurize and supply the raw water to the inside of the pressure vessel from the outside, so that it can be operated at a high pressure. It can be.

The field of water treatment using such a pressurized membrane module is widely used not only in water purification devices but also in various fields such as pharmaceutical, semiconductor manufacturing, sewage treatment, and industrial water treatment.

Korean Patent Laid-Open Publication Nos. 2008-005772 and 2006-0019245 disclose a method of manufacturing a washing machine having an outlet for discharging produced water passing through a separation membrane on an upper part of a body, discharging concentrated water in a lower part of the body, And connecting the pipes.

However, as shown in FIG. 1, the conventional pressurized membrane module water purification device has a discharge port 21 for discharging the filtered production water through the hollow fiber membrane at the upper end of the housing 10 where the hollow fiber membrane, And a lower cap (20) having an air supply port (31) through which air is supplied during backwashing to remove foreign matters adhering to the hollow fiber membrane, The raw water pressurized and supplied to the inside of the housing has a single water collecting structure that is filtered while passing through the hollow fiber membrane by the supply pressure and then discharged and collected through the discharge port of the upper cap.

In FIG. 1, reference numeral 22 denotes an outlet through which unfiltered concentrated water is discharged, and reference numeral 32 denotes an inlet through which raw water flows.

Accordingly, there is a limit in increasing the filtration resistance and improving the productivity of the produced water as the flow path of the raw water into the lower portion of the housing and discharging the raw water upward is increased.

In addition, since the raw water is filtered from the lower part of the hollow fiber membrane to the upper part in one direction, filtration does not uniformly utilize the entire area of the separation membrane. Therefore, the contamination of the separation membrane is increased and the replacement time of the separation membrane is shortened. .

When the module length is increased in order to increase the water treatment amount in accordance with the actual situation of the water treatment market requiring the high flow rate processing ability, resistance and pressure loss of the raw water passing through the hollow fiber membrane are increased, There is a problem that the efficiency is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a filtration apparatus capable of simply changing production water filtered through a hollow fiber membrane to both ends collecting not only at the upper end of the housing but also at the lower end, To provide a lower collection assembly of a pressurized membrane module purification apparatus capable of reducing the resistance to filtration, reducing the operation cost owing to a low operating pressure, and realizing a high flow rate water purification process and low energy compared to the membrane area.

In order to accomplish the above object, the present invention provides a hollow fiber membrane filtration apparatus comprising: a hollow fiber membrane filtration unit disposed in an inner space of a housing having a predetermined length; a first outlet port through which concentrated water is discharged; And a header portion, wherein the residual water remaining in the hollow fiber membrane filtration portion is discharged to the outside, and an outflow inlet through which air for removing foreign matter is supplied is provided, and residual water discharged to the hollow fiber membrane portion And an air supply module; And a lower header part having an inlet port through which the raw water is pressurized, a third outlet port connected to the outlet port, and a fourth outlet port through which the produced water filtered through the hollow fiber membrane filtration part is discharged. A bottom collecting assembly of a membrane module water purification apparatus is provided.

Preferably, the residual water discharge and air supply module includes a plurality of insertion tubes connected to a plurality of insertion grooves formed in the hollow fiber membrane filtration section, and an inner space connected to the insertion tube, And a module body disposed in the header portion.

More preferably, the insertion tube has an O-ring member on its outer surface to generate a frictional force with the inner surface of the insertion groove.

Preferably, the lower header portion includes a lower header having the inlet port on the outer surface of the body, and a lower cap having the third outlet port and the fourth outlet port and coupled to cover the opened lower portion of the lower header.

More preferably, the lower header is provided with a female screw portion on the upper inner circumferential surface so as to be screwed with the male screw portion formed on the outer peripheral surface of the lower end of the lower cap.

More preferably, a lower rectifier tube is inserted between the inner surface of the lower header and the outer surface of the hollow fiber membrane filtration portion and has a plurality of openings formed on the outer surface of the body.

Preferably, the fourth outlet is provided at a predetermined angle to the third outlet that extends vertically downward.

Preferably, the residual water discharge and air supply module and the lower header part define a lower space through which the product water is filtered after being passed through the open lower part of the hollow fiber membrane filtration part and then discharged downward, And connected to the fourth outlet.

The present invention as described above has the following effects.

(1) a lower catchment assembly for discharging a part of the filtered water produced at the lower end of the housing for discharging the filtered production water to the upper end, wherein the raw water is supplied under pressure and the hollow fiber filtration part is provided, Since the production water can be collected and collected, the resistance and differential pressure generated in filtering the raw water compared to the length and area of the hollow fiber filtration part can be reduced, and the operation cost can be reduced by operating the water purification device at a low operating pressure And can meet the high flow rate conditions per unit time by increasing the production water treatment and production amount compared with the conventional conditions. .

(2) The entire area of the hollow fiber membrane filtration part is uniformly used to prolong the service life, thereby reducing the replacement cycle of consumables, thereby reducing facility maintenance costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a conventional pressurized membrane module purification apparatus according to the prior art; FIG.
FIG. 2 is an external view of a pressurized membrane module water purification apparatus having a bottom collecting assembly according to a preferred embodiment of the present invention.
3 is an exploded perspective view illustrating a pressurized membrane module water purification apparatus having a lower water collection assembly according to a preferred embodiment of the present invention.
4 is a view illustrating a bottom catchment assembly according to a preferred embodiment of the present invention.
FIG. 5 (a) is a cross-sectional view illustrating a flow of production water in a pressurized membrane module water purification apparatus having a lower water collection assembly according to a preferred embodiment of the present invention.
FIG. 5 (b) is a cross-sectional view illustrating residual water discharge and air supply / discharge flow in a pressurized membrane module water purification apparatus having a lower water collection assembly according to a preferred embodiment of the present invention.
FIG. 6 is a graph showing the purified water performance of the pressurized membrane module water purification apparatus having the lower water collection assembly according to the preferred embodiment of the present invention.
FIG. 7 is a graph showing permeability of a pressurized membrane module water purification apparatus having a lower water collection assembly according to a preferred embodiment of the present invention.

The above objects, features and advantages of the present invention will become more apparent from the following detailed description. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, the lower catchment assembly 200 according to the preferred embodiment of the present invention includes a housing 110, a hollow fiber membrane filtration unit 120, a high flow rate And a residual water discharge and air supply module 240 and a lower header part 250 so as to be able to simultaneously produce and discharge the production water at both ends when the raw water filtration process is assembled at the lower part of the pressurized membrane module purification apparatus 100.

The housing 110 may be formed of a hollow cylindrical member having an inner space of a predetermined size to dispose the hollow fiber membrane filtration unit 120 and having a predetermined height.

The housing 110 may have a hollow cylindrical member or a rectangular cross-section.

The hollow fiber membrane filtration unit 120 filters the raw water such as wastewater, which is disposed in the inner space of the housing 110 and is supplied to the inside of the housing 110 by pressure difference, As shown in FIG.

The hollow fiber membrane filtration unit 120 includes a hollow fiber membrane 121 bundled so as to increase the membrane area ratio per unit area of the hollow fiber membrane hollowed out at the center, And a plurality of insertion grooves 122 through which the insertion tube of the supply module 240 is inserted.

The hollow fiber membrane filtration unit 120 is fixed to the upper and lower inner circumferential surfaces of the housing 110 by means of adhesion means 125 such as urethane or silicone to seal the interface therebetween, Is firmly fixed to the housing 110 and the raw water supplied into the housing is prevented from flowing out to the unnecessary area.

The upper portion of the hollow fiber membrane filtration unit 120 corresponding to the upper header unit 130 is formed with an opening for discharging the produced water through the second outlet 133 provided in the upper header unit 130 And the lower portion of the hollow fiber membrane filtration unit 120 corresponding to the lower header unit 150 is also formed to open to allow the filtered production water to pass through the hollow fiber membrane filtration unit 120 to be discharged to the outside.

The upper header 130 includes a first outlet 131 through which the concentrated water containing the filtered contaminants can not pass through the hollow fiber membrane filtration unit 120 among the raw water supplied to the inside of the housing 110, And a second outlet 133 through which filtered water produced in the raw water passed through the hollow fiber membrane filtration unit 120 is discharged and assembled to the upper end of the housing 110.

The upper header portion 130 includes an upper header 132 having the first outlet 131 on the outer surface of the body and a second outlet 133 to open the upper portion of the upper header 132 And an upper cap 134 coupled to cover.

Here, the upper header 132 has a male thread portion formed on an upper outer circumferential surface thereof, and the upper cap 134 has a female screw portion formed on a lower end inner circumferential surface thereof, and is assembled in a screw-type manner. However, Or may be assembled in other bonding schemes such as fusion bonding.

The hollow fiber membrane filtration unit 120 and the second discharge port 133 are filled with the produced water discharged through the hollow fiber membrane filtration unit 120 while passing through the hollow fiber membrane filtration unit 120, The inlet of the second outlet 133 and the upper end of the hollow fiber filtration part 120 are spaced apart from each other to form the upper space.

Accordingly, the second outlet 133 can be installed in an arbitrary region corresponding to the firing space filled with the produced water, and is connected to a production water discharge line (not shown) for discharging the produced water.

An upper rectifying tube 136 having a plurality of openings 135 formed through the outer surface of the body is inserted between the inner surface of the upper header 134 and the outer surface of the hollow fiber membrane filter 120.

Meanwhile, the lower water collecting assembly 200 is provided with a water collecting assembly 200 installed at the lower end of the housing so as to discharge upwardly the produced water through the second outlet 133 of the upper header 130, An exhaust and air supply module 240 and a lower header portion 250.

That is, the residual water discharge and air supply module 240 discharges the remaining water remaining in the hollow fiber membrane filtration unit 120 to the outside when the raw water supply for washing the hollow fiber membrane filtration unit is interrupted, And an outflow inlet (241) through which the foreign material removing air is supplied to remove foreign matter adhering to the outer surface of the hollow fiber membrane filtration unit (120).

The residual water discharge and air supply module 240 is inserted into a plurality of insertion grooves 122 formed in the lower portion of the hollow fiber membrane filtration unit 120 to guide and discharge residual water remaining in the hollow fiber membrane in its own weight direction A plurality of insertion tubes 242 to which foreign material removing air supplied from the outside is supplied, and an outflow inlet 241, and an inner space connected to the insertion tube 242, And a module body 243 inserted and disposed in the housing.

Here, the outer surface of the insertion tube (243) is inserted into the insertion groove (122) formed in the lower portion of the hollow fiber membrane filtration part (120) And an O-ring member for generating an O-ring.

The insertion tube 242 is composed of a hollow tube member vertically extending at a predetermined height on the upper surface of the module body 243 having an inner space. The module body 243 has an outlet opening 241) to a predetermined length

The lower header portion 250 in which the residual water discharging and air supply module 240 is inserted is provided with an inlet 251 through which raw water as an object to be treated is supplied from the outside and an outlet 252 provided below the module body 243 A third outlet 253 connected to the outflow inlet 241 and a fourth outlet 254 through which the produced water filtered through the hollow fiber membrane filtration unit 120 is discharged.

The lower header section 250 includes a lower header 252 having an inlet 251 connected to the raw water supply line on the outer surface of the body and a third outlet 253 and a fourth outlet 254, And a lower cap 255 coupled to cover the open lower portion of the lower header 252.

The lower header 252 has a male screw portion 252a formed on the lower end peripheral surface and the lower cap 255 has a female screw portion 255a formed on the lower end inner circumferential surface of the lower header 252 and the lower cap 255, Can be assembled to each other in a threaded manner.

Although the mutual coupling between the lower header 252 and the lower cap 255 has been shown and described as being screwed, it is not limited thereto and may be assembled by other coupling methods such as press fitting or welding.

Although the lower header 252 and the lower cap 255 are illustrated as being composed of the upper and lower assembly members, the lower header 252 and the lower cap 255 may be formed of a single member.

The fourth outlet (154) provided on the outer surface of the body of the lower cap (255) and through which the produced water is discharged may be inclined at a predetermined angle with respect to the third outlet (253) extending vertically to the lower portion.

Between the inner surface of the lower header 252 and the outer surface of the hollow fiber membrane filtration unit 120, a lower rectifying tube 138 having a plurality of openings 137 formed therein is inserted and disposed on the outer surface of the body.

The outflow inlet 241 of the module body 243 constituting the residual water discharge and air supply module 240 is inserted into the third outlet 253 provided in the lower cap 255, It is preferable that an O-ring member 241a is provided on the outer surface of the outflow inlet 241 so that the produced water led to between the outer surface of the module body 243 and the inner surface of the lower cap 255 does not flow out .

The outer surface of the module body 243 constituting the residual water discharging and air supply module 240 and the outer surface of the lower cap 255 are passed through the hollow fiber membrane filtration unit 120, A bottom space is formed so that the produced water discharged through the hollow fiber membrane with the rear open bottom is filled and the produced water discharged through the fourth discharge opening 254 to the outside, The outer surface of the module body 243 is formed to be smaller than the inner diameter of the lower cap 255 so that the outer surface of the module body 243 is spaced from the inner surface of the lower cap 255, And may be spaced apart from the open lower end of the hollow fiber membrane filtration unit 120 at a predetermined interval.

The filtered water produced through the hollow fiber membrane filtration unit 120 passes through the second outlet 133 formed in the upper cap 134 of the upper header 130 assembled to the upper end of the housing 110, . At the same time, the fourth water outlet 254 of the lower cap 255 provided in the lower header part 150 of the lower water collecting assembly 200 assembled at the lower end of the housing 110 can simultaneously produce the water, It is.

The lower water collecting assembly 200 assembled at the lower end of the housing 110 can also produce and discharge the produced water to the outside through the fourth outlet 254 formed in the lower cap 255 of the lower header part 250 It is.

5 (a), part of the produced water filtered while passing through the hollow fiber membrane 121 is guided to the upper part of the drawing, which is the opposite direction of its own weight, so that the upper cap 130 134 through a second outlet 133 formed in the second outlet 133. [

At the same time, the remainder of the product water filtered while passing through the hollow fiber membrane 121 is discharged through the open lower end of the hollow fiber membrane 121 constituting the hollow fiber membrane filtration unit 120, Is filled in a space formed on the outer side of the module body 243 of the residual water discharge and air supply module 240 and then guided to the lower part in the drawing in the direction of its own weight so as to be guided to the lower cap 255 of the lower header part 250 4 outlets 254. [0052]

The raw water that has been supplied through the inlet 251 and filtered through the hollow fiber membrane filtration unit 120 is supplied to the upper and lower portions of the upper and lower header units, The water permeability and the production amount can be improved as compared with the case where the second outlet 133 and the fourth outlet 254 provided in the cap are simultaneously discharged through the fourth outlet 254 to produce and discharge the production water in a single direction.

At this time, the outflow inlet 241 of the module body 243 in which the insertion tube is inserted into the insertion groove of the hollow fiber membrane filtration unit 120 is closed, so that the produced water is not discharged to the outside, The concentrated water that has not yet passed through the portion 120 is discharged to the outside through the discharge port 131.

On the other hand, if the water treatment operation is performed for a long time, the contamination concentration of the inside of the housing 110 and the hollow fiber membrane filter 120 gradually increases, and particularly, the foreign matter filtered in the hollow fiber membrane 121 becomes gradually adhered to the hollow fiber membrane The water permeation rate of the raw water passing through the water supply passage 121 is gradually reduced.

At this time, the inside of the housing 110 and the hollow fiber membrane filtration unit 120 are cleaned. Such a cleaning operation is performed by back washing cleaning, air cleaning by vibration, chemical cleaning so that the contaminants attached to the hollow fiber membrane 121 can be separated and removed.

That is, as shown in FIG. 5 (b), the cleaning operation is performed in a state where the inlet port where the raw water is supplied is closed, and after the inlet port 251 is closed, The residual water remaining in the hollow fiber membrane filtration unit 120 is discharged through the insertion tube 242 inserted into the insertion groove 242 of the module body 243 , And the collected water is discharged to the outside through the outflow inlet 241. [

When air is supplied to the inner space of the module body 243 by the air pump connected to the outflow inlet 241, air is supplied to the housing 110 through the module body 243, the insertion tube 242, To remove the foreign matter adhering to the outer surface of the hollow fiber membrane 121 through the vibration of the hollow fiber membrane filter 120.

At this time, the foreign matter attached to the hollow fiber membrane filtration unit 120 is separated and released by air, and is discharged to the outside together with the air through the first discharge port 131 which is opened.

When the backwash water is supplied through the second outlet 133 provided at the upper portion of the upper cap 134, the backwash water passes through the hollow fiber membrane filtration unit 120 from the inside to the outside, , And the separated foreign substances are discharged to the outside through the discharge port together with the backwash water and the air.

FIG. 6 is a graph showing the water purification performance of a pressurized membrane module water purification apparatus having a lower water collection assembly according to a preferred embodiment of the present invention, and FIG. 7 is a graph showing the water purification performance of the pressurized membrane module with the lower water collection assembly according to the preferred embodiment of the present invention. FIG. 5 is a graph showing permeation performance of the module water purifier. FIG.

That is, the lower water collecting assembly of the present invention is provided in a pressurized membrane module water purification apparatus having a total length of 2270 mm, an outer diameter of the housing of 194 mm, and a filtration area of the hollow fiber membrane filtration unit of 60 m 2, The flow rate and differential pressure of the produced water discharged and produced through the second and fourth discharge ports of the upper and lower caps assembled at both ends of the housing are measured by supplying raw water under the same pressurization conditions, It can be seen that the differential pressure between the membranes in the present invention capable of collecting both ends under the same permeation flow rate is 35 Kpa, whereas the conventional differential pressure between single membranes is 58 Kpa.

Accordingly, the filtration pressure for treating the raw water in the water purification apparatus to which the present invention is applicable, which is capable of collecting both ends, is reduced by about 40% as compared with the conventional one, thereby increasing the operating pressure and operation efficiency.

Also, in the permeability diagram of the raw water passing through the hollow fiber membrane filtration section, as shown in FIG. 7, it can be seen that the purification apparatus to which the present invention is applied is more than 44% higher than that of the prior art.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

110: housing 120: hollow fiber membrane filtration unit
121: hollow fiber membrane 122: insertion groove
125: Adhesive means 130:
131: first outlet 132: upper header
133: second outlet 134: upper cap
135, 137: openings 136, 138: upper and lower rectifying tubes
240: Residual water discharge and air supply module 241:
242: insertion tube 243: module body
250: lower header part 251: inlet
252: lower header 253: third outlet
254: fourth outlet 255: bottom cap

Claims (8)

A hollow fiber membrane filtration unit disposed in an inner space of the housing having a predetermined length for filtering the raw water supplied to the inside of the housing in accordance with a pressure difference; a first discharge port for discharging the concentrated water; and a second discharge port for discharging the produced water And a top header part for receiving the pressurized membrane module,
A residual water discharging and air supply module connected to the hollow fiber membrane unit and having an outflow inlet for discharging residual water remaining in the hollow fiber membrane filtration unit to the outside and supplied with air for removing foreign matter; And
And a lower header part having a third outlet connected to the outlet and a fourth outlet for discharging the filtered production water passing through the hollow fiber membrane filtration part,
Wherein the lower header portion includes a lower header having the inlet port on an outer surface of the body, and a lower cap having the third outlet port and the fourth outlet port and coupled to cover the opened lower portion of the lower header,
Wherein the lower header is provided with a female threaded portion on an upper inner circumferential surface so as to be screwed with a male thread portion formed on an outer circumferential surface of a lower end of the lower cap. The method according to claim 1,
Wherein the residual water discharge and air supply module comprises a plurality of insertion tubes connected to a plurality of insertion grooves formed in the hollow fiber membrane filtration section and an inner space connected to the insertion tube and having the outflow inlet, And a module body disposed therein. ≪ Desc / Clms Page number 14 > 3. The method of claim 2,
Wherein the insertion tube has an O-ring member on an outer surface to generate a frictional force with an inner surface of the insertion groove. delete delete The method according to claim 1,
Wherein a lower rectifier tube having a plurality of openings formed through an outer surface of the body is inserted and disposed between an inner surface of the lower header and an outer surface of the hollow fiber membrane filtration unit. The method according to claim 1,
Wherein the fourth outlet is sloped at an angle to a third outlet vertically extending to the lower portion. ≪ RTI ID = 0.0 > 15. < / RTI > The method according to claim 1,
The residual water discharging and air supply module and the lower header part define a lower space through which the product water is filtered after being passed through the open lower part of the hollow fiber membrane filtration part and then filled with the product water to be discharged downward, And a lower water collecting assembly of the pressurized membrane module water purification apparatus.

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