KR101594197B1 - Filtering device having a cleaning function - Google Patents

Abstract

One embodiment relates to a filtration device used in filtration tanks in a constant or sewage elevation process. As the filtration operation continues, the filtration apparatus has the problem that the contaminants contained in the raw water are concentrated and adhered to the outside and the filtration efficiency is lowered. In this case, it is necessary to clean the outside of the filtration membrane. In the present invention, the cleaning fluid spouting portion adjacent to the filtration membrane in the frame outside the filtration membrane is provided to improve the cleaning efficiency of the filtration membrane and prevent the increase of the dissolved oxygen amount in the filtration tank from being excessively increased.
And may include an outer frame, a fluid collecting portion, and a filtered water collecting portion that facilitate the simultaneous use of a plurality of filtration units. As a result, a filtration apparatus having a high filtration efficiency can be constructed within a filtration tank of a limited size.

Description

FIELDING DEVICE HAVING A CLEANING FUNCTION FIELD OF THE INVENTION [0001]

The embodiment relates to a filtration device inside a filtration tank that replaces the role of the final settling tank in a constant or sewage elevation treatment operation. In the case of the filtration apparatus used, the filtration efficiency is lowered as the contaminants of the raw water are concentrated outside the filtration apparatus while continuing the operation for a long period of time. In this case, it is necessary to clean the surface of the filtration membrane, and in the present invention, the efficiency of cleaning can be improved by adjoining a jet port for jetting the cleaning fluid to the filtration apparatus.

Among the existing filtration devices, the immersion type flat membrane module used a method of aeration from below the module for cleaning. In this case, since the air bubbles rise and the membrane surface is cleaned, the cleaning efficiency is lowered because direct injection toward the surface of the membrane can not be performed. In addition, the upper part of the membrane is mainly polluted due to the characteristic of the pollutants having a large amount of suspended solids in the advanced treatment, but when they are aerated downward in order to clean the pollutant, the pollutant cleaning ability is lowered.

In order to solve this problem, increasing the amount of air aeration in the lower part causes excessive energy consumption and increases the amount of dissolved oxygen in the raw water, so that if the raw water is recovered in the anaerobic tank or anoxic tank, I had.

Therefore, there is a need for a filtration device capable of increasing the filtration efficiency by efficiently cleaning pollutants and raising the amount of dissolved oxygen in the filtration tank to a limited extent.

In the embodiment, the filtration apparatus provided in the filtration apparatus has an injection port adjacent to the filtration membrane and capable of injecting the cleaning fluid, so that the filtration membrane is directly cleaned, thereby increasing the cleaning efficiency and increasing the dissolved oxygen amount due to the aeration for cleaning Do not. It is another object of the present invention to provide a method for efficiently cleaning a plurality of filtration apparatuses and allowing each filtration apparatus to be installed in a filtration tank easily.

 An immersion type membrane filtration unit is provided according to an embodiment. The filtration unit can perform a filtering operation not only with a single unit but also with a module including a plurality of units. The filtration membrane frame portion surrounding the filtration membrane of the filtration unit has a fluid ejection opening for cleaning which can clean the outside of the filtration membrane. As described above, the water or the washing water is sprayed through the cleaning fluid jet port adjacent to the filtration membrane to which the contaminants are adhered, thereby enhancing the removal efficiency of the contaminants. The cleaning fluid can be ejected when the amount of filtered water to be filtered is reduced by a certain ratio or more as compared with that during the initial operation.

In addition, a plurality of filtration units may be mounted on the outer frame to perform filtering operation in the filtration tank to increase the filtration water collection speed. At this time, a fluid guide unit, a fluid collecting pipe, a filtered water guide unit, . ≪ / RTI >

 According to the embodiment, by providing the cleaning fluid ejection port adjacent to the filtration membrane, it is possible to improve the performance of removing contaminants from the outside of the filtration membrane, while preventing the excessive increase in the amount of dissolved oxygen in the filtration tank.

Further, since a plurality of filtration units can be used, maximum filtration efficiency and speed can be obtained in a filtration tank of a limited size.

Fig. 1 is a view showing the appearance of a filtration tank 1 for filtering wastewater according to an embodiment.
2 is a view showing a state of the filtration membrane unit 100 according to the embodiment.
FIG. 3 is a cross-sectional view of the filtration membrane unit 100 'of FIG. 2 according to the embodiment.
4 is a view of the filtration membrane frame enlargement unit 110 of FIG. 2 according to the embodiment.
5 is a view showing the nozzle 140 in the fluid ejecting portion according to the embodiment.
6 is a view showing the II-II` cut plane of the filtration membrane unit 100 of FIG. 2 according to the embodiment.
7 is a view of an outer frame in which the filtration membrane unit 100 according to the embodiment can be seated.
8 is a view of an outer frame 200 on which the filtration membrane unit 100 according to the embodiment is placed.
Fig. 9 is a view showing an outer frame 200 on which the filtration membrane unit 100 according to the embodiment is placed, is installed in the filtration tank 1. Fig.
10 is a view of a filtration apparatus according to an embodiment.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It should be understood, however, that there is no intention to limit the scope of the present invention to the embodiment shown, and that other embodiments falling within the scope of the present invention may be easily devised by adding, Can be proposed.

1 is a view showing a water treatment apparatus according to an embodiment. 2 is a view showing a state of a filtration membrane unit according to an embodiment. 3 is a cross-sectional view taken along the line I-I 'in FIG. FIG. 4 is an enlarged view of a portion 110 in FIG. 5 is a view showing another example of the fluid ejecting portion. Fig. 6 is a cross-sectional view taken along the line II-II 'in Fig. 2. Fig. 7 is a perspective view showing an outer frame. 8 is a view showing a state in which the filtration membrane unit according to an embodiment of the present invention is seated in an outer frame. Fig. 9 is a view showing the filtration membrane unit installed in the filtration tank with the filtration membrane unit being seated in the outer frame 200. Fig. 1 to 10, a water treatment apparatus according to an embodiment of the present invention includes a filtration tank 1, a raw water inlet 2, a filtration device 3, A discharge pipe 3 and a filtering water storage tank 3.

The raw water to be filtered through the raw water inflow part (2) flows into the filtration tank (1). The raw water is temporarily stored in the filtration tank (1). The raw water stored in the filtration tank (1) is filtered by a filtration device (4). The filtered water filtered by the filtration device 4 is stored in the filtered water storage tank (not shown) through the filtered water discharge pipe 3.

2 to 9, the filtration apparatus 3 includes at least one filtration membrane unit 100, an outer frame, and a fluid injection section.

The filtration membrane unit 100 is provided in the outer frame. The filtration membrane unit filters the raw water in the filtration tank to produce filtered water.

Referring to Fig. 2, the filtration membrane unit 100 includes two filtration membranes 101 and a filtration membrane frame.

The filtration membranes are spaced apart from each other at a predetermined interval, and are opposed to each other. Accordingly, a predetermined space may be formed between the filtration membranes. The filtration membranes include fine pores. The diameter of the pores may vary widely depending on the diameter of the particles to be sieved. For example, the diameter of the pores may be from a few nanometers to a few tens of micrometers. That is, the filtered water passes through the pores, and the foreign matter can not pass through the pores.

The filtration membrane frame surrounds the filtration membranes. More specifically, the filtration membrane frame may surround an outer portion of the filtration membranes. Further, the filtration membrane frame supports the filtration membrane. Further, the filtration membrane frame may seal the space between the filtration membranes.

The fluid injection part is provided in the filtration membrane frame. The fluid ejection unit ejects a fluid toward the filtration membranes. The fluid may be a cleaning gas or cleaning liquid for cleaning the filtration membranes. More specifically, the cleaning gas is compressed air, and the cleaning liquid may be filtered water. The cleaning liquid may further contain chemicals for promoting cleaning.

The fluid ejection unit may be integrally formed with the filtration membrane frame. That is, the fluid ejection unit may be configured as a part of the filtration membrane frame. Alternatively, the fluid ejection unit may be provided separately from the filtration membrane frame.

A flow path 107 for supplying a fluid to the fluid spraying part 104a may be formed in the filtration membrane frame 102. Alternatively, the flow path may be provided outside the filtration membrane frame 102.

In addition, the fluid can be supplied to the flow path through the upper fluid supply part 105. However, when the fluid is supplied to one side, the fluid ejection part of the side frame remote from the upper fluid supply part 105 may have a lower ejection pressure than that of the upper part. Therefore, the lower fluid supply part 120 is further provided at the lower end of the filtration membrane unit 100 can do. The upper fluid supply part 105 and the lower fluid supply part 120 are supplied with fluid from the outside through the fluid guiding part 301 to be described later. The supplied fluid may be air or three fluid. In addition, if necessary, the lower fluid injection portion 104c directed to the filtration membrane 101 side may be provided at the lower end of the filtration membrane unit 100. [ In this case, the flow path 107 may exist on both sides and the bottom of the filtration membrane frame 102. The filtered water filtered through the filtration membrane (101) is discharged to the outside through the filtered water discharge unit (106). The filtered water discharging portion 106 is basically drilled to perform the filtering operation while moving the raw water into the filtration membrane 101. The filtration membrane unit 100 can perform a filtration operation even by using one unit, and the filtration operation can be performed by using a plurality of the filtration membrane units 100 together.

Referring to FIG. 3, the filtration membrane 101 is composed of a first filtration membrane 101a and a second filtration membrane 101b facing each other, and a space through which filtered water can move can be formed therein. The filtered water discharging unit 106 is notified of the space where the filtered water can move and can discharge the filtered water to the outside. The first filtration membrane 101a has a second flat surface facing the first filtration membrane 101b and the second filtration membrane 101b has a second flat surface facing the first filtration membrane 101b. And a fourth plane facing the plane. When the filtration membrane unit 100 is subjected to the raw water filtration operation, contaminants contained in the raw water may contaminate the second and fourth flat surfaces of the filtration membrane, which may result in deterioration of filtration ability. In order to prevent this, the filtration efficiency can be increased by jetting the fluid through the fluid jetting portion and cleaning the second plane and the fourth plane by the pressure of the fluid. The fluid ejected to the fluid ejecting portion can be supplied through a fluid supply pipe.

4, the fluid injection parts 104a and 104b are formed in the filtration membrane frame 102 in the direction toward the filtration membrane 101 and the fluid injection parts 104a and 104b are positioned on the upper side with respect to the direction of gravity The diameters of the fluid injection portions 104a and 104b may be equal to or smaller than the diameters of the fluid injection portions 104a and 104b located at the lower side. When the fluid is supplied to the flow path 107 only by the upper fluid supply part 105, the fluid injection parts 104a and 104b (see FIG. 10) in which the fluid pressure in the fluid injection parts 104a and 104b, So that the fluid can be cleaned at a uniform pressure in each fluid jetting portion. When the lower fluid supply part 120 is present, the diameters of the fluid injection parts 104a and 104b are increased from the upper end of the filtration membrane frame 102 to the lower end thereof and then increased to the maximum at the center of the filtration membrane frame 102, .

Referring to FIG. 5, when the fluid is sprayed to clean the filtration membrane 101, the directivity of the fluid ejected may be deteriorated. Further, the nozzle 140 may be additionally provided in the fluid ejection portion to improve the directivity. The nozzle 140 may be a linear nozzle and may be made of the same material as the filter membrane frame 102. In addition, the direction in which the nozzle 140 is directed may be a downward direction in the gravity direction with respect to the raw water surface. As a result, when the fluid sprayed in the downward direction is air, it can have an effect of removing contaminants on the upper portion of the filtration membrane 101.

6, a flow passage 107 is formed in the both-side filtration membrane frame 102 and fluid injection portions 104a and 104b capable of injecting fluid from the flow passage 107 toward the fourth plane are formed . The fluid injecting sections 104a and 104b can be inclined downward in the gravity direction with respect to the water surface of the raw water. Accordingly, when the fluid to be injected is air, the contaminants can be removed from the outer surface of the filtration membrane 101 while rising after the injection. The filtered water discharging portion 106 is connected to a space through which the filtered water formed by the first and third planes can move, thereby discharging the filtered water to the outside.

Referring to FIG. 7, the filtration membrane unit 100 can perform a filtration operation even with a single unit, but a plurality of filtration membrane units 100 are seated on the outer frame 200 to maximize the filtration efficiency by enlarging the surface area thereof Filtration can be done. The numbers of the filtration membrane units 100 that are seated on one outer frame 200 and on which the filtration membrane frames 102 are mounted on the guide units 201 located on the side of the outer frame 200 are not limited by the above figures. Further, the interval between the guide portions 201 in FIG. 7 is only one embodiment, and the interval may be narrowed if necessary, and may preferably be an interval of 2 to 10 mm.

8, raw water can be introduced into a plurality of filtration membrane units 100 mounted on an outer frame 200, filtered through respective filtration membranes 101, and filtered to respective filtrate discharge units 106 Can be discharged. It is possible to remove contaminants from the outside of the filtration membrane 101 by aeration by a separate aeration unit (not shown) selectively located below the outer frame 200 on which the filtration membrane unit 100 is placed. The spacing between the filtration membrane units 100 in Fig. 8 is only one example, and may preferably be an interval of 2 to 10 mm.

A fluid guide portion 301 mounted on the upper side of the outer frame 200 and connected to the fluid supply portions 105 and 120 of the filtration membrane unit 100 and a fluid aggregate portion 302 communicated with the fluid guide portion 301, . The fluid aggregate portion 302 may be present on both sides of the outer frame 200 and may be notified to each other and connected to a separate fluid supply device 401. When the fluid is supplied to the plurality of filtration membrane units 100 thus mounted, one fluid supply device 401 can be used to supply the fluid. It is possible to supply the fluid to each of the fluid supply units 105 and 120 through the plurality of fluid supply apparatuses 401 without notifying the fluid aggregate units 302. As described above, the fluid supplied through the fluid supply device 401 may be air or three fluid.

A filtering water guiding part 303 mounted on the upper side of the outer frame 200 and connected to the filtered water discharging part 106 of the filtration membrane unit 100 and a filtration collecting part 304 communicated with the filtered water guiding part 303, As shown in FIG. (Not shown) connected to the outside through the filtration collecting unit 304. The filtration water collecting unit 304 can collect the filtration water.

Referring to FIG. 9, a plurality of outer frames 200 may be installed in one filtration tank 1. Each of the filtration collecting units 304 may be notified to each other to form one discharge unit, and each of the fluid supply units 105 and 120 may be notified to each other to form one supply unit and may be connected to the fluid supply unit 401. The outer frame 200 may be immersed in water to perform a filtering operation.

10, there may be one or more filtration devices each having a filtration tank 1 and a raw water inflow portion 2 and in which a filtration membrane unit 100 installed in the outer frame 200 is installed in the filtration tank 1. There may be a filtered water discharge pipe 3 connected to the filtration collecting unit 304 of the filtration apparatus to discharge the filtered water.

There may be an inverted water washing apparatus 402 connected to the filtration collecting unit 304. When the amount of filtrate to be filtered becomes lower than that in the initial operation, the backwashing apparatus 402 can discharge the reverse water and clean the filtration membrane 101. The filtered water discharge valve 403 at one side of the filtered water discharge pipe 3 is shut off at the time of discharging the backwash water so that the backwash water is prevented from being discharged through the filtered water transfer pipe and is effectively washed.

There may be a fluid supply device 401 capable of ejecting fluid when the amount of filtrate to be connected and filtered through the fluid collecting part 302 and the fluid discharge pipe 404 becomes lower than that in the initial operation. The fluid supplied by the fluid supply device 401 may be air or three integers and the fluid supplied by the fluid supply device 401 may flow through the fluid discharge pipe 404, the fluid aggregate portion 302, The surface of the filtration membrane 101 can be cleaned by being delivered to the supply units 105 and 120 and being injected into the fluid injection units 104a and 104b through the flow path 107 provided in the frame of each filtration membrane unit 100. [

The fluid supply device 401, the filtered water discharge valve 403 and the backwater spraying device 402 can be controlled by a controller (not shown), and the control method can be controlled to an existing input value, It can also be controlled via input.

Filtration tank (1) Raw water inlet (2)
Filtration equipment (3) Filtration equipment (4)
The filtration membrane unit 100 includes a filtration membrane 101,
The filtration membrane frame 102 fluid injection portion 104a,
The upper fluid supply part 105, the filtered water discharge part 106,
The flow path 107 of the lower flow-
The outer frame 200 includes a guide portion 201,
The fluid inducing unit 301 includes a fluid aggregating unit 302,
The filtrate inducing unit 303, the filtration collecting unit 304,
The fluid supply device (401)
The filtered water discharge valve (403)

Claims (15)

One or more filtration membranes;
A filtration membrane frame supporting the filtration membranes and simultaneously enclosing an outer periphery;
A plurality of fluid ejecting portions adjacent to the filtration membrane for ejecting a fluid capable of cleaning the filtration membrane; And
And a flow path for supplying the fluid to the fluid spraying unit and located in the filtration membrane frame,
Wherein the fluid ejection portion is formed to face the filtration membrane side on both sides of the filtration membrane frame so that the direction of the fluid is inclined downward in the gravity direction with respect to the water surface of the raw water,
Wherein a diameter of the fluid ejecting portion located on the upper side of the gravity direction of the fluid ejecting portion is equal to or smaller than a diameter of the fluid ejecting portion located on the lower side.
The method according to claim 1,
Wherein the filtration membrane comprises a first filtration membrane and a second filtration membrane which are opposed to each other;
Wherein the first filtration film is composed of a second plane facing a first plane opposed to the second filtration film;
Wherein the second filtration film is formed of a fourth plane facing the third plane opposed to the first filtration film;
Characterized in that the fluid jetting portion is directed to the second plane and the fourth plane side on both sides of the filtration film frame 3. The method of claim 2,
And a lower fluid injection portion formed upwardly from the lower portion of the filtration membrane frame to inject fluid into the second plane and the fourth plane, 3. The method of claim 2,
The fluid ejecting apparatus according to claim 1,
The apparatus of any preceding claim, further comprising a nozzle
delete delete 3. The method of claim 2,
And at least one filtered water discharge portion provided above the filtration membrane frame and communicating with a space formed by the first filtration membrane, the second filtration membrane, and the filtration membrane frame. 8. The method of claim 7,
Further comprising: an upper fluid supply unit located at upper ends of both sides of the filtration membrane frame and communicating with the flow channel;
The filtrate discharge portion includes a filtration device 9. The method of claim 8,
And a lower fluid supply unit located at the lower ends of both sides of the filtration membrane frame and communicating with the flow channel, The method according to claim 1,
And a fluid supply device for supplying a fluid to the flow path 11. The method of claim 10,
And a control device for operating the fluid supply device when the amount of filtrate to be filtered through the filtration membranes is less than a predetermined value, The method according to claim 1,
The fluid ejected through the fluid ejection unit may be air or a cleaning water, 3. The method of claim 2,
Further comprising a backwash water jetting device capable of jetting reverse water in a direction in which raw water flows in a space between the first filtration membrane and the second filtration membrane 9. The method of claim 8,
Wherein the filtration membrane frame is a seated outer frame;
A filtered water guiding part installed on the upper side of the outer frame and connected to the filtered water discharging parts, respectively; And
Further comprising at least one filtered water collecting unit connected to the filtered water inducing unit so as to be notified and connected to the filtered water inducing unit 15. The method of claim 14,
A fluid guiding unit mounted on the upper side of the outer frame and connected to the fluid supply unit, respectively; And
Further comprising at least one fluid aggregate portion communicated with and notified to the fluid guiding portion

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