KR101530879B1 - Apparatus and Method for Detecting Damage of Filtration Membrane - Google Patents

Abstract

The present invention relates to an apparatus and a method for detecting damage to a filtration membrane. The apparatus detects whether the filtration membrane installed to filter raw water or reuse wastewater is damaged or not in real time. The apparatus for detecting damage to a filtration membrane in a water filtering system comprises: a connecting portion, as a hollow housing with a passage where treated water penetrates inside, having a first coupling groove, which is formed on one side of the housing, with a first window where laser light is incident in the center, having a second coupling groove, which is formed on the other side of the housing in a location facing the first coupling, with a second window where the laser light is emitted along a central shaft same as the first window and with a third window where the scattered laser light inside the housing is emitted, and having a pair of discharge pipe coupling grooves formed on both sides mutually facing the housing in a location perpendicular to a connecting shaft of the first coupling groove and the second coupling groove; a light source portion having a laser module for providing the laser light through the first window inside as a hollow housing combined with the first coupling groove; a light receiving portion, as a hollow housing combined with the second coupling groove, having a photoelectric module with a photoelectric sensor which receives the light emitted through the third window inside and converts the light into an electric signal; and a determination portion for analyzing the electric signal provided from the photoelectric module of the light receiving portion, and determining whether the filtration membrane is damaged or not in accordance with a result.

Description

Technical Field [0001] The present invention relates to an apparatus and method for detecting a membrane damage,

The present invention relates to a water treatment system, and more particularly, to a filtration membrane damage monitoring apparatus and method for monitoring in real time whether a filtration membrane installed to purify raw water or reuse sewage water is damaged.

As water supply pollution becomes more serious, there is a growing interest in water quality and there is an increasing demand for high-level water or sewage treatment. In response to these demands, attempts have been made to supplement existing water or sewage treatment facilities or introduce new filtration devices and filtration processes. However, in order to supplement existing facilities or introduce new advanced treatment facilities, there are various difficulties such as site acquisition and cost. Therefore, not only stable water quality but also ease of operation and maintenance are important for existing sori system.

On the other hand, a water treatment method using membrane filtration is well known as a water purification or sewage re-treatment process for removing contaminants contained in raw water. This membrane filtration and water treatment method is a method of separating contaminants in raw water using a membrane having a selective permeation function. This is advantageous in that the suspended solids contained in the raw water can be reliably removed. However, in such a process, an adherent layer formed by contaminants or solids on the surface of the filtration membrane is formed, and the membrane filtration performance is deteriorated. In this case, it is possible to recover the membrane filtration performance by washing the filtration membrane through physical washing such as backwashing of water or air backwashing or chemical washing by dissolving or dissolving it by using a medicine.

Usually, the filtration membrane used in the filtration apparatus includes a hollow fiber membrane and a flat membrane. The hollow fiber membrane or the membrane membrane in the form of a flat membrane is a membrane capable of removing suspended substances and bacteria contained in raw water. For example, Lt; RTI ID = 0.0 > um < / RTI > However, for good water quality, it is important to check occasionally for damage to the filtration membrane. This is because if there is damage to a portion of the filtration membrane due to any cause, there is a high possibility that the contaminant leaks from the filtration membrane. Therefore, it is important to detect and cope with the damage of the filter membrane in the membrane filtration process.

In the filtration membrane damage detection technique in the conventional membrane filtration process, most of the techniques for introducing air into the primary side in the gas-liquid or gas-gas condition of the primary side and the secondary side are introduced. -2009-0110020, and Korean Patent Laid-Open No. 10-2012-0044080.

In addition, in addition to the membrane damage detection method through the air pressure change as described above with the conventional filter membrane damage detection technology, Korean Patent No. 10-0965135 discloses a technique of detecting the damage of the filtration membrane by measuring the resonance frequency using the piezoelectric body, Korean Patent Laid-Open Publication No. 10-2012-0102392 discloses a technique for diagnosing whether or not a filter membrane is damaged by using an impedance and an induced ultrasound wave.

In such a conventional membrane filtration process, there are problems in that the membrane filtration is sensed based on the air pressure change rate and the membrane filtration is sensed using the resonance frequency of the piezoelectric body. However, there is a problem in that the sensing sensitivity is low, There is also a problem that the method using the guided ultrasonic wave is somewhat less reliable in sensitivity accuracy.

In recent years, a method of detecting the damage of the filtration membrane by measuring the number and size of impurities using light has been developed. However, impurities below a specific size have no limits on the accuracy of measurement because no shadows are generated. In addition, the measurement method using light has to be cleaned when the measuring cell is contaminated. However, the structure of the measuring cell is complicated, and disassembly and reassembly for cleaning are very complicated.

- Korean Patent Laid-Open No. 10-2009-0110020 (filed on October 21, 2009) - Korean Patent Laid-Open No. 10-2012-0044080 (filed on May 07, 2012) - Domestic Registration No. 10-0965135 (Registration Notice for Jun. 23, 2010) - Domestic patent 10-2012-0102392 (filed on September 18, 2012)

The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a filtration membrane damage monitoring apparatus and method which can improve detection sensitivity and accuracy by sensing impurities of a minute size.

Another object of the present invention is to provide a filtration membrane damage monitoring apparatus having a structure in which detection cells can be easily separated, cleaned and reassembled.

According to an aspect of the present invention, there is provided an apparatus for monitoring a filter membrane damage in a water treatment system, the apparatus comprising: a hollow housing having a flow passage for passing treatment water therethrough, the housing being formed on one side of the housing, A second window formed on the other side of the housing opposite to the first fastener and having the same center axis as the first window, the second window having the laser light emitted therefrom, And a third window having a third window through which laser light scattered in an oblique direction is emitted from the inside of the housing, and a second window having a first window and a second window which are opposed to each other at a position perpendicular to a connection axis of the first and second fasteners A connection portion having a pair of discharge pipe fasteners formed on both sides so as to be detachably connected to the process water discharge pipe; A light source unit including a laser module for providing laser light to the interior of the housing through the first window, the light source unit being coupled to the first fastener so as to be detachable; And a second window formed on the substrate and having a light-transmitting hole through which laser light emitted to the second window passes, and a second window that receives the laser light emitted from the third window, A photoelectric module having a photoelectric sensor mounted on the substrate so as to be perpendicular to the third window for switching to a signal; A determination unit for analyzing an electrical signal provided from the photoelectric module of the light receiving unit and determining whether the filter membrane is damaged according to the result; A display unit for displaying a result to be analyzed by the determination unit in real time; And an alarm unit for informing the outside of the filter membrane through an alarm when it is determined that the filter membrane is damaged.

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According to the present invention having the above-described structure, by using laser light impinging on an impurity, impurities of a minute size can be detected, and detection sensitivity and accuracy can be improved.

In addition, since the light source unit and the light receiving unit are separately detachable from both sides of the process water discharge pipe, the detection cell can be easily separated, cleaned, and reassembled.

1 is a view showing an example of a water treatment system according to an embodiment of the present invention;
FIG. 2 is a block diagram schematically showing a structure of a filter membrane damage monitoring apparatus according to an embodiment of the present invention;
3 is a cross-sectional view showing a filtration membrane damage monitoring apparatus according to an embodiment of the present invention, and Fig.
FIG. 4 is a perspective view showing a connection part which is a main part of FIG. 3. FIG.

The technical problems achieved by the present invention and the implementation of the present invention will be clarified by the following preferred embodiments. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, the upper and lower sides or left and right sides refer to relative positions and directions, not to specify their positions and directions, and the upper and lower sides may be expressed as left and right, or the right and left sides may be represented as upper and lower sides.

1 is a view showing an example of a water treatment system according to an embodiment of the present invention.

As shown in the figure, the water treatment system of the present invention basically comprises a membrane module 20, and the membrane module 20 is composed of a housing 21 and a plurality of filtration membranes 22 provided in the housing 21. At this time, the filtration membrane 22 includes microfiltration and ultrafiltration, which are used for various water treatments such as water treatment, seawater desalination treatment and sewage water recycling treatment, and in one embodiment, . The membrane module 20 is divided into a primary side outside the filtration membrane 22 and a secondary side inside the filtration membrane 22 on the basis of the surface of the filtration membrane 22. One end of the membrane module 20 is connected to the raw water tank 23 and the other end is connected to the treatment water tank 25.

The raw water in the raw water tank 23 is supplied to the primary side of the membrane module 20 through the raw water supply pipe 24 and the raw water supplied to the primary side is filtered by the filtration membrane 22, The treated water is filtered by the filtration membrane 22 and the treated water permeates the filtration membrane 22 and is supplied to the secondary side which is an internal space of the filtration membrane 22. The treated water of the secondary side is finally discharged through the treated water discharge pipe 26 25). One or a plurality of such membrane modules 20 may be integrated into one raw water tank 23 and the treatment water tank 25.

Particularly, in the present invention, the filtration film damage monitoring device 10 is coupled to the process water discharge pipe 26 discharged after the raw water is purified. The filtration membrane damage monitoring apparatus 10 senses the amount of impurities contained in the treated water to detect damage, and detects the amount of impurities using laser light. The filtration film damage monitoring apparatus 10 may be provided in the process water discharge pipe 26 of each membrane module 20 or may be provided in a process water discharge pipe module in which a plurality of membrane modules are connected together. Further, the filtration film damage monitoring apparatus 10 may be directly coupled to the process water discharge pipe 26, or may be coupled to a bypass process water discharge pipe for separately extracting the treated water sample. Hereinafter, the filtration film damage monitoring device 10 coupled to the process water discharge pipe will be described in detail.

 3 is a cross-sectional view illustrating a filtration membrane damage monitoring apparatus according to an embodiment of the present invention. FIG. 4 is a cross- Fig.

2, the filtration membrane damage monitoring apparatus of the present invention includes a connection unit 100 to which a process water discharge pipe 26 is connected, a light source unit 200 that irradiates laser light with process water, And a determination unit 400 for determining whether the filter film is damaged according to characteristics of the laser light measured at the light receiving unit 300 and the light receiving unit 300 for receiving the laser light. In addition, the filtration membrane damage monitoring apparatus of the present invention includes a display unit 500 for providing the water quality status of the treated water in real time, and a warning unit 600 for notifying that the filtration membrane is damaged.

Here, the connection part 100 intervenes in the process water discharge pipe 26 through which the treated water purified by the membrane module is discharged so that the treated water can flow inside. At the same time, the connection part 100 combines the light source part 200 and the light receiving part 300, So that the laser light can penetrate in the vertical direction. That is, the connection unit 100 connects the process water discharge pipe 26, the light source unit 200, and the light receiving unit 300 to each other so that the process water and laser light can cross each other vertically in the internal space.

The light source unit 200 generates laser light and provides the laser light to the process water passing through the connection unit 100. In the light source unit 200, a laser beam having a predetermined diameter is provided inside the connection unit 100. In particular, in the present invention, a laser beam having a wavelength of several hundreds of nm is generated. At this time, a laser module that generates light of a specific wavelength range such as 600 nm or 400 nm may be applied according to the nature of the raw water.

The light receiving unit 300 is configured to receive the laser light of the light source unit 200 that has passed through the connection unit 100. In particular, the light receiving unit 300 collides with the impurities contained in the treated water inside the connection unit of the light source 200, Receiving light. The light receiving unit 300 receives the light scattered in the diagonal direction and converts the light into an electrical signal.

The determination unit 400 analyzes the strength of the electrical signal provided from the light receiving unit 300 to determine whether the filter membrane is damaged. That is, when the intensity of the electrical signal provided from the light receiving unit 300 exceeds a predetermined reference value, the determination unit 400 determines that the filter membrane is damaged. At this time, the reference value includes the type of the raw water, Size (or the size of the third window), and the like.

The display unit 500 is a function for displaying data such as an electrical signal provided by the light receiving unit 300 and a reference value provided by the determining unit 400. The display unit 500 displays various data for determining whether the filter film is damaged through the display device, . When the determination unit 400 determines that the filtration membrane is damaged, the alarm unit 600 informs the operator of the damage through the alarm sound so that the operator can take prompt action.

Each component that performs the above functions is connected to the process water discharge pipe 26 through which the process water is discharged and monitors the process water flowing through the process water discharge pipe 26 in real time to determine whether the filtration membrane is damaged.

3 and 4, the connection part 100 is a hollow housing, in which a flow path 100a through which process water flows is formed, and a process water discharge pipe 26 is coupled to upper and lower sides of the connection part 100 To this end, a pair of discharge pipe fasteners 130 are provided at upper and lower ends, respectively. The treated water discharge pipe 26 is fastened on both sides so that the treated water purified in the membrane module passes through the connecting portion 100.

The light source unit 200 and the light receiving unit 300 are coupled to the left and right sides of the connection unit 100. A first fastener 110 for fastening the light source unit 200 to the left side of the housing is provided, 300 are fastened to each other. A first window 111 is formed in the first fastener 110 so that the laser light generated in the light source unit 200 enters into the connection part 100. The second fastener 120 is connected to the inside of the connection part 100, A second window 121 and a third window 122 for allowing the light passing through the light receiving unit 300 to be emitted to the light receiving unit 300 are formed. These windows 111, 121 and 122 may be made of a transparent glass having excellent light transmittance and formed to have a diameter larger than the diameter of the laser light.

Particularly, in the second window 121 and the third window 122 formed in the second fastening member 120, the second window 121 is formed in the second window 121, It is a translucent window through which light that does not impinge on the impurity passes as it is. Accordingly, the second window 121 is formed on the same central axis as the first window 111. [

The third window 122 is a light transmitting window for allowing the scattered light to collide with the impurities contained in the treatment water in the laser light passing through the connection part 100. When impurities are contained in the treated water, a part of the laser light incident on the inside of the connection part 100 collides with the impurities and is scattered, so that the traveling direction changes with a predetermined inclination. The third window 122 is a light transmitting window through which the impinging light is emitted, and is formed at a predetermined inclination at a position apart from the second window 121. At this time, the third window 122 is tilted away from the central axis with respect to the direction in which the laser light advances.

The exhaust pipe fastener 130, the first fastener 110 and the second fastener 120 for fastening the process water discharge pipe 26, the light source unit 200 and the light receiving unit 300, And a fastening means.

The light source unit 200 includes a housing 10 and a laser module 220 disposed inside the housing 210 to emit laser light. The housing 210 has a hollow cylindrical shape, and fastening means corresponding to the first fastening hole 110 is formed at one end of the housing 210 so as to be detachably coupled to the connection portion 100. The laser module 220 generates laser light of various wavelengths such as a 600 nm wavelength region or a 400 nm wavelength region. The light source unit 200 is coupled to the connection unit 100 such that the outgoing lens of the laser module 220 coincides with the center line of the first window 111 of the first fastener 110.

The light receiving unit 300 includes a housing 310 and a photoelectric module 320 disposed inside the housing 310 to convert the received light into an electrical signal. The housing 310 has a hollow cylindrical shape, and fastening means corresponding to the second fastening hole 120 is formed at one end of the housing 310 so as to be detachably coupled to the connection portion 100. The light source module 320 is mounted with a photoelectric sensor 322 on a substrate 321 having a predetermined circuit and the substrate 321 is provided with a light emitter for passing laser light emitted to the second window 121 And the photoelectric sensor 322 is arranged at a right angle with respect to the third window 122. That is, the photoelectric sensor 322 is configured to convert laser light emitted to the third window 122 into an electrical signal, and should be disposed perpendicular to the third window 122 having a predetermined tilt angle.

The determination unit 400 may be coupled to the interior of the housing 310 of the light receiving unit 300 and determines whether the filter membrane is damaged according to the magnitude of the signal provided from the photoelectric module 320. The determination unit 400 may be implemented in the form of an IC chip, and a predetermined program for determining damage to the filtration membrane is built in. The result of the determination unit 400 is provided to the display unit 500 and the warning unit 600 in real time.

The operation of the filtration film damage monitoring apparatus having the above-described structure will be described. The light source unit 200 irradiates the treated water flowing through the connection unit 100 with laser light in real time. When the filtration film of the membrane module is not damaged, light passes through the first window 111, the treated water, and the second window 121, so that no light is received by the photoelectric sensor 322 and no electrical signal is generated. However, when the membrane module is damaged, impurities are included in the treated water. In the process of passing the laser light through the treated water, a part of the light collides with the impurities and is scattered to change the traveling direction. The light impinging on the impurity is emitted to the outside of the connection portion through the third window 122 and is received by the photoelectric sensor 322 to generate an electrical signal. In addition, when the impurity contained in the treated water is increased, the intensity of the electric signal is increased. When the electric signal is supplied from the photoelectric module 322 to the determination unit 400, the determination unit 400 determines that the filtration membrane is damaged. And is notified through the display unit 500 and the warning unit 600.

As described above, the present invention can detect the damage of the filter membrane by detecting the amount of the laser light impinging on the impurities included in the treatment water, thereby improving the detection sensitivity and accuracy by judging whether or not the filter membrane is damaged even for minute impurities . Also, it is easy to install by connecting to the process water discharge pipe, and the light source unit and the light receiving unit are attached to and detached from the connection unit using the screw fastening, so that the cleaning and reassembling of the exit lens and window can be easily performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: Connection
110: first fastener 120: second fastener
130: exhaust pipe fastener 111: first window
121: second window 122: third window
200: light source 220: laser module
300: light receiving section 320: photoelectric module
400:
500:
600: Warning section

Claims (4)

A filtration membrane damage monitoring apparatus in a water treatment system,
A first housing having a first window formed on one side of the housing and having a first window through which a laser beam is incident, a second housing having a first housing and a second housing facing each other, And a third window formed on the first window and having a second window through which the laser beam is emitted along the same center axis as the first window and a third window through which a laser beam that is scattered in an oblique direction within the housing is emitted, And a pair of discharge pipe fasteners formed on opposite sides of the housing at positions perpendicular to the connecting shafts of the first fastener and the second fastener, A connecting portion to be fastened;
A light source unit including a laser module for providing laser light to the interior of the housing through the first window, the light source unit being coupled to the first fastener so as to be detachable;
And a second window formed on the substrate and having a light-transmitting hole through which laser light emitted to the second window passes, and a second window that receives the laser light emitted from the third window, A photoelectric module having a photoelectric sensor mounted on the substrate so as to be perpendicular to the third window for switching to a signal;
A determination unit for analyzing an electrical signal provided from the photoelectric module of the light receiving unit and determining whether the filter membrane is damaged according to the result;
A display unit for displaying a result to be analyzed by the determination unit in real time; And
And a warning unit for informing the outside of the filter through the alarm when the determination unit determines that the filtration membrane is damaged. delete delete delete

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