Detection apparatus, detection method and program

Abstract

To provide a detection apparatus capable of reliably performing solid-liquid separation in water treatment.SOLUTION: An information processing unit 18 used as a detection apparatus has a CPU 31 and an SSD 34, and the CPU 31 extracts the displacement frequency, which indicates the displacement frequency of a float 16 floating on the surface of treated water and the time interval of displacement, based on the displacement amount in the vertical direction of the float 16 and the measured time, or the displacement amount stored in the SSD 34 and the elapsed time from the reference time. When the displacement frequency does not match the aeration frequency stored in the SSD 34 in advance, the position range of an aperture 14 that emits coarse bubbles impinging on the float 16 is identified.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a detection device, a detection method, and a program, and more particularly to a detection device, a detection method, and a program used to reliably perform cleaning of a solid-liquid separation membrane used in water treatment. [Background technology]

[0002] Conventionally, water supply treatment is carried out to convert raw water such as river water, dam water, or lake water into drinking water, and sewage treatment is carried out to safely discharge raw water such as domestic wastewater and industrial wastewater into rivers. In either water treatment, a solid-liquid separation process for separating and removing solids contained in the water to be treated is carried out using a solid-liquid separation membrane for water treatment, such as a microfiltration membrane (MF membrane), an ultrafiltration membrane (UF membrane), a nanofiltration membrane (NF membrane), a reverse osmosis membrane (RO membrane), or a forward osmosis membrane (FO membrane). The solid-liquid separation membrane is immersed in a reaction tank filled with the water to be treated. If the solid-liquid separation process is carried out continuously, dirt adheres to the surface of the solid-liquid separation membrane, causing the solid-liquid separation membrane to become clogged, and efficient solid-liquid separation is not carried out. In response to this, a method of washing the solid-liquid separation membrane by colliding coarse bubbles with the solid-liquid separation membrane is known (see, for example, Patent Document 1).

[0003] When the coarse bubbles collide with the solid-liquid separation membrane, the solid-liquid separation membrane oscillates, and dirt adhering to the surface of the solid-liquid separation membrane is peeled off, the solid-liquid separation membrane is cleaned, and clogging of the solid-liquid separation membrane is eliminated. The coarse bubbles collide with the solid-liquid separation membrane and oscillate the solid-liquid separation membrane. The size of the coarse bubbles varies depending on the size and type of the solid-liquid separation membrane, but for example, the volume of the coarse bubbles just before colliding with the solid-liquid separation membrane may be 10cc or more, more preferably 30cc or more, and even more preferably 50cc or more. The coarse bubbles are diffused from an air diffuser disposed between the bottom of the reaction tank and the solid-liquid separation membrane. The air diffuser has a plurality of openings for diffusing the coarse bubbles, and the coarse bubbles are emitted from each opening and aerated to the solid-liquid separation membrane. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2012-002427 Summary of the Invention [Problem to be solved by the invention]

[0005] However, solids contained in the water to be treated may block some of the openings of the air diffuser. Coarse bubbles are diffused from other openings of the air diffuser. Since the reaction tank is filled with dark wastewater containing suspended matter such as activated sludge and flocculated sludge, the state inside the reaction tank can only be confirmed by looking at the surface of the water to be treated, but it is not possible to determine whether some of the openings of the air diffuser are blocked. Therefore, there is a problem that coarse bubbles are not diffused from some of the blocked openings of the air diffuser, and a part of the solid-liquid separation membrane that is not cleaned by the coarse bubbles becomes clogged, making it impossible to reliably perform solid-liquid separation in water treatment.

[0006] In addition, the manager in charge of the water treatment process only notices that the solid-liquid separation membrane may be partially clogged when the solid-liquid separation membrane becomes completely clogged and the filtration performance of the solid-liquid separation membrane is significantly reduced. Therefore, the manager stops the water treatment process and pulls the solid-liquid separation membrane out of the reaction tank to check whether the solid-liquid separation membrane is clogged. This causes a problem that the water treatment process cannot be stably performed.

[0007] An object of the present invention is to provide a detection device, a detection method, and a program that can reliably perform solid-liquid separation in water treatment and stably perform water treatment. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the detection device of the present invention is a detection device that detects coarse bubbles used for cleaning a solid-liquid separation membrane that separates and removes solids contained in the treated water, and is characterized in that it comprises a collision means with which the coarse bubbles collide, an acquisition means for acquiring displacement information related to the vertical direction of the collision means, and an identification means for extracting a displacement frequency based on the displacement information and identifying the installation position of the collision means based on the displacement frequency.

[0009] In order to achieve the above-mentioned object, the wastewater treatment device of the present invention is a wastewater treatment device that separates and removes solids contained in water to be treated, and is equipped with a solid-liquid separation membrane that separates and removes solids contained in the water to be treated, an aeration device that aerates coarse bubbles used to clean the solid-liquid separation membrane, and a detection device that detects the coarse bubbles, wherein the detection device is characterized by comprising a collision means with which the coarse bubbles collide, an acquisition means that acquires displacement information related to the vertical direction of the collision means, and an identification means that extracts a displacement frequency based on the displacement information and identifies the installation position of the collision means based on the displacement frequency.

[0010] In order to achieve the above-mentioned object, the detection method of the present invention is a detection method for detecting coarse bubbles used for cleaning a solid-liquid separation membrane that separates and removes solids contained in the treated water, and is characterized by having an acquisition step of acquiring displacement information related to the vertical direction of a collision means against which the coarse bubbles collide, and an identification step of extracting a displacement frequency based on the displacement information and identifying the installation position of the collision means based on the displacement frequency.

[0011] In order to achieve the above-mentioned object, the program of the present invention is a program that causes a computer to execute a detection method for detecting coarse bubbles used for cleaning a solid-liquid separation membrane that separates and removes solids contained in the treated water, and is characterized in that the detection method has an acquisition step of acquiring displacement information regarding the vertical direction of a collision means against which the coarse bubbles collide, and an identification step of extracting a displacement frequency based on the displacement information and identifying the installation position of the collision means based on the displacement frequency. Effect of the Invention

[0012] According to the present invention, solid-liquid separation in water treatment can be reliably performed, and water treatment can be stably performed. [Brief description of the drawings]

[0013] [Figure 1] 1A and 1B are diagrams used to explain a treatment tank in which a detection device according to an embodiment of the present invention is disposed, and FIG. 1(A) is a front view of the treatment tank, and FIG. 1(B) is a cross-sectional view along line II in FIG. 1(A). [Diagram 2] FIG. 2 is a plan view of the treatment tank in FIG. [Diagram 3] 2 is a block diagram illustrating a schematic configuration of the information processing device in FIG. 1. [Figure 4] 2 is a flowchart showing the procedure of a detection process for detecting whether or not a coarse bubble is emitted from the opening in FIG. 1(B). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0015] Fig. 1 is a diagram used to explain a processing tank 11 in which a detection device 10 according to an embodiment of the present invention is disposed, Fig. 1(A) is a front view of the processing tank 11, and Fig. 1(B) is a cross-sectional view taken along line II in Fig. 1(A). Fig. 2 is a plan view of the processing tank 11 in Fig. 1(A) (information processing device 18 is not shown).

[0016] 1 and 2, the treatment tank 11 is equipped with an aeration device 12 that diffuses coarse bubbles and a solid-liquid separation membrane 13 that separates and removes solids contained in the water to be treated, and the aeration device 12 is disposed between the bottom of the treatment tank 11 and the solid-liquid separation membrane 13, and is arranged so as to diffuse coarse bubbles over the entire lower part of the solid-liquid separation membrane 13. The treatment tank 11 is filled with the water to be treated. The aeration device 12 is connected to a blower B installed outside the treatment tank 11, and the blower B sends air to the aeration device 12. The solid-liquid separation membrane 13 is connected to a pump P installed outside the treatment tank 11. The detection device 10 is equipped with a float 16 (collision means), a displacement sensor 17 (acquisition means), and an information processing device 18 (identification means).

[0017] The air diffuser 12 has a plurality of openings 14, and the air sent from the blower B is blown from each opening 14 into the water to be treated as coarse bubbles, and is intermittently aerated throughout the entire lower portion of the solid-liquid separation membrane 13. The size of the coarse bubbles emitted from each opening 14 varies depending on the size, type and inter-membrane distance of the solid-liquid separation membrane, but from the viewpoint of the cleaning efficiency of the solid-liquid separation membrane and the appropriate detection of the coarse bubbles, it is preferable that the volume of each coarse bubble emitted from each opening 14 is 100cc or more, further 300cc or more, and particularly 500cc or more. In addition, from the viewpoint of the cleaning efficiency of the solid-liquid separation membrane and the appropriate detection of the coarse bubbles, the diameter of each coarse bubble emitted from each opening 14 is preferably 1 / 4 to 3 / 4 of the interval d between the adjacent solid-liquid separation membranes, more preferably 1 / 3 to 2 / 3 of d, and even more preferably 1 / 3 to 1 / 2 of d, and is, for example, 5 to 100 cm, and preferably 10 to 50 cm. The shape of the openings 14 may be square, rectangular or circular, and the size of the openings 14 is not particularly limited as long as the volume and diameter of each of the emitted coarse bubbles are within the above-mentioned ranges, but one side or diameter of the openings 14 is, for example, 5 to 100 cm, and preferably 10 to 50 cm. The number of openings 14 provided in the air diffuser 12 varies depending on the type, number and size of the solid-liquid separation membrane, and is, for example, 5 to 100, and preferably 5 to 20.

[0018] The solid-liquid separation membrane 13 may be an MF membrane, a UF membrane, a NF membrane, an RO membrane, or an FO membrane, and may be, for example, a membrane module having a plurality of hollow fiber membranes. When the pump P is driven, the solid content contained in the water to be treated is captured by the outer surface of the hollow fiber membrane, and the water in the water to be treated moves from the outside to the inside of the hollow fiber membrane, and is discharged to the outside of the treatment tank 11 through the inside of the hollow fiber membrane. The number of hollow fiber membranes provided in the membrane module is not particularly limited, but is, for example, 10 to 1000, and preferably 20 to 200. The solid-liquid separation membrane 13 is not limited to a hollow fiber membrane, and may have a plurality of flat membranes. The bottom of the membrane module is open to the water to be treated so that the coarse bubbles emitted from each opening 14 can easily enter the gap between the membranes. When the coarse bubbles emitted from each opening 14 to the water to be treated are aerated to the solid-liquid separation membrane 13, the solid-liquid separation membrane 13 in the vicinity of the passage of the coarse bubbles oscillates. The coarse bubbles that have rocked the solid-liquid separation membrane 13 rise to the top of the water to be treated and are released from the surface of the water to be treated. The solid-liquid separation membrane 13 may be surrounded by a housing made of, for example, four rectangular plates and open at the top and bottom. By surrounding the solid-liquid separation membrane 13 with such a housing, the coarse bubbles emitted from each opening 14 are aerated to the solid-liquid separation membrane 13 without waste, and the solid-liquid separation membrane 13 can be oscillated efficiently.

[0019] A float 16 (collision means) floats on the surface of the water to be treated. Coarse bubbles emitted from a specific opening 14 into the water to be treated rise to the surface of the water to be treated and reach a certain location on the surface of the water to be treated. Therefore, if the float 16 floats at a location where the coarse bubbles reach the surface of the water to be treated, the coarse bubbles will collide with the float 16. The float 16 may be placed at any location where the water treatment manager desires to detect coarse bubbles. That is, multiple floats 16 may be placed at equal intervals on the surface of the water to be treated at all times, or a single float 16 may be placed so that the time and location at which it floats on the surface of the water to be treated are changed. In addition, if there is an opening 14 that tends to be clogged, the float 16 may be placed at a location where the coarse bubbles emitted from the opening 14 reach the surface of the water to be treated.

[0020] The treatment tank 11 will be described below with a focus on the specific opening 14 and the float 16 that is installed at a location where the coarse bubbles emitted from the opening 14 reach.

[0021] Coarse bubbles emitted from opening 14 and reaching the water surface of the water to be treated collide with float 16, causing float 16 to be displaced in the vertical direction. Float 16 has a displacement sensor 17 (acquisition means), which measures the amount of displacement (displacement information) of float 16 displaced in the vertical direction due to the collision of coarse bubbles with float 16. Here, displacement sensor 17 reduces the influence of other amounts of displacement, such as the amount of vertical displacement due to changes in the water level of the water to be treated and the amount of vertical displacement due to swells on the water surface of the water to be treated, and emphasizes only the amount of displacement due to the collision of coarse bubbles with float 16. The amount of vertical displacement of float 16 can be measured using a general displacement sensor.

[0022] Therefore, the displacement sensor 17 is preferably fixed to the side of the float 16 rather than to the lower part of the float 16 where the coarse bubbles collide, and the shape of the float 16 is preferably such that the ratio of the maximum cross-sectional area in the vertical direction to the maximum cross-sectional area in the horizontal direction when floating on a stationary water surface is 0.5 or more, more preferably 1.0 or more, and even more preferably 2 to 100, and the cross-sectional shape of the float 16 having the maximum cross-sectional area in the vertical direction is preferably an ellipse or an oval. In order to float the float at a predetermined measurement position on the water surface, a fixed rod extending in the vertical direction is provided at a predetermined position, and the float is arranged to move up and down along the fixed rod. Specifically, the float and the fixed rod are connected using a connecting member such as a rope or a chain. As a result, even if the water to be treated is wavy due to aeration to the solid-liquid separation membrane 13, the float floats at the predetermined measurement position on the water surface, so that the displacement sensor 17 can be arranged at a position desired by the user. The displacement sensor 17 may be integrated with the float 16 or may be configured to be separable. By integrating the displacement sensor 17 with the float 16, the displacement sensor 17 will not separate from the float 16 even if coarse bubbles repeatedly collide with the float 16, and it is possible to accurately measure the displacement of the float 16. The displacement sensor 17 is connected to an information processing device 18 by wire or wirelessly, and the vertical displacement of the float 16 measured by the displacement sensor 17 is input to the information processing device 18.

[0023] FIG. 3 is a block diagram showing a schematic configuration of the information processing device 18 appearing in FIG.

[0024] The information processing device 18 in Fig. 3 includes a CPU 31 (specifying means), a RAM 32, a ROM 33, an SSD 34, a data input unit 35, an output unit 36, and a user interface UI, which are connected to each other via an internal bus 37. The CPU 31 loads a program stored in the ROM 33 or the SSD 34 into the RAM 32, which is the work memory of the CPU 31, and executes it. The amount of displacement of the float 16 in the vertical direction measured by the displacement sensor 17 and the time when the amount of displacement was measured (displacement information) are input from the data input unit 35 and stored in the ROM 33 or the SSD 34. In addition, information on the frequency at which coarse bubbles are emitted from the opening 14 into the water to be treated and aerated to the solid-liquid separation membrane 13, for example, the number of aeration times per unit time and the time interval of intermittent aeration (hereinafter referred to as "aeration frequency"), is stored in advance in the SSD 34.

[0025] Based on the displacement amount input from the data input unit 35, the CPU 31 extracts the displacement frequency indicating the number of displacements of the float 16 per unit time and the time interval of the displacement, and outputs the displacement frequency of the float 16 to the output unit 36. At this time, the frequency of collision of the coarse bubbles with the float 16 may be extracted as the displacement frequency, for example, the number of times per unit time the coarse bubbles collide with the float 16 may be extracted. By using such a collision frequency as the displacement frequency, there is an advantage that the displacement frequency based on the displacement amount of the float 16 input from the data input unit 35 can be easily extracted. In addition, the CPU 31 compares the aeration frequency stored in advance in the SSD 34 with the displacement frequency of the float 16, and determines whether the aeration frequency and the displacement frequency of the float 16 match. Here, the case where the aeration frequency and the displacement frequency match includes not only the case where the number of times per unit time and the intermittent time interval match completely, but also the case where the tendency of the displacement frequency of the float 16 follows the tendency of the aeration frequency of the air diffuser 12. When the aeration frequency and the displacement frequency of the float 16 match, the CPU 31 outputs that coarse bubbles are appropriately emitted from the opening 14 into the water to be treated. On the other hand, when the aeration frequency and the displacement frequency of the float 16 do not match, the CPU 31 identifies the float 16 that shows a displacement frequency that does not match the aeration frequency, and identifies the opening 14 from which the coarse bubbles that would collide with the identified float 16 are emitted. The identified opening 14 is output to the output unit 36.

[0026] FIG. 4 is a flow chart showing the procedure of a detection process for detecting whether or not a coarse bubble is emitted from the opening 14 in FIG.

[0027] In the detection process (detection method) of Fig. 4, first, the displacement sensor 17 measures the amount of displacement of the float 16 in the vertical direction (S41, acquisition step), and the measured amount of displacement is input from the data input unit 35 together with the time of measurement or the elapsed time from a reference time based on a predetermined time, and stored in the SSD 34. The CPU 31 executes a Fourier transform to convert the time domain data into frequency domain data using the amount of displacement stored in the SSD 34 and the time of measurement, or the amount of displacement stored in the SSD 34 and the elapsed time from the reference time, and extracts the displacement frequency indicating the number of displacements of the float 16 and the time interval of the displacements (S42, identification step). The displacement frequency acquired in S42 is output to the output unit 36 ​​and stored in the SSD 34.

[0028] Next, the CPU 31 compares the aeration frequency stored in advance in the SSD 34 with the displacement frequency of the float 16 (S43) and determines whether the aeration frequency and the displacement frequency of the float 16 match (S44, identification step). The aeration frequency, which is information on the number of aerations per unit time and the time interval of intermittent aeration, varies depending on the size, type and intermembrane distance of the solid-liquid separation membrane, but for example, the number of aerations per minute is 10 to 100 times, preferably 15 to 50 times. As a result of the determination in S44, when the aeration frequency and the displacement frequency of the float 16 match (YES in S44), the CPU 31 determines that coarse bubbles are appropriately emitted from the opening 14 to the water to be treated, outputs to the output unit 36 ​​that the aeration device 12 is appropriately emitting coarse bubbles, and displays on the user interface UI (S45). Specifically, the user interface UI displays that the aeration device 12 is operating normally.

[0029] On the other hand, when the aeration frequency and the displacement frequency of the float 16 do not match as a result of the determination in S44 (NO in S44), it is determined that the coarse bubbles are not being appropriately emitted from the opening 14 to the water to be treated, and the CPU 31 identifies the installation position of the float 16 that shows a displacement frequency that does not match the aeration frequency. Next, the CPU 31 identifies the position range of the opening 14 from which the coarse bubbles that should reach the installation position of the identified float 16 are emitted, and outputs to the output unit 36 ​​the fact that the coarse bubbles are not being emitted from the opening 14 in the identified position range to the water to be treated, and displays it on the user interface UI (S46). Specifically, the user interface UI displays that an abnormality has occurred in the aeration device 12 and that inspection is required. Then, this process ends.

[0030] The condition under which the aeration frequency and the displacement frequency of the float 16 do not match may be set in advance. For example, the condition may be set such that the CPU 31 determines that the aeration frequency and the displacement frequency of the float 16 do not match when a displacement frequency that should be detected within a certain period of time is not detected consecutively.

[0031] According to the detection process of Fig. 4, the aeration frequency stored in advance in the SSD 34 is compared with the displacement frequency of the float 16, and it is determined whether the aeration frequency and the displacement frequency of the float 16 match (S44). When the aeration frequency and the displacement frequency of the float 16 match, it is output that the coarse bubbles are appropriately emitted from the opening 14 to the water to be treated (S45). When the aeration frequency and the displacement frequency of the float 16 do not match, it is determined that the coarse bubbles are not emitted from the opening 14 to the water to be treated, the installation position of the float 16 showing the displacement frequency that does not match the aeration frequency is specified, and the position range of the opening 14 from which the coarse bubbles that should reach the specified installation position of the float 16 are emitted is specified (S46).

[0032] Therefore, when coarse bubbles are not being generated, the opening 14 which is the cause of the generation is identified, and the identified opening 14 can immediately be effectively maintained to remove the clogging, such as by cleaning. As a result, the coarse bubbles are appropriately generated from the opening 14, so the solid-liquid separation membrane 13 is sufficiently cleaned by the coarse bubbles, and the solid-liquid separation membrane 13 which is not clogged can be used for solid-liquid separation in water treatment, and thus solid-liquid separation in water treatment can be reliably performed. In addition, the opening 14 from which coarse bubbles are not being generated is immediately identified, and the maintenance of the opening 14 is appropriately performed, so that it is not necessary to stop the water treatment and pull out the solid-liquid separation membrane from the reaction tank in order to check whether the solid-liquid separation membrane 13 is clogged, and thus the water treatment can be stably performed.

[0033] The present invention can also be realized by a process in which a program for realizing one or more of the functions of the above-mentioned embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program, and a computer-readable storage medium storing the program also constitutes the present invention. The present invention can also be realized by a circuit for realizing one or more of the functions.

[0034] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. [Explanation of symbols]

[0035] 12 Air diffuser 13 Solid-liquid separation membrane 14 Aperture 16 Float 17 Displacement Sensor 18 Information processing equipment 31 CPU 35 Data Entry Section

Claims

1. A detection device for detecting coarse bubbles used in cleaning a solid-liquid separation membrane that separates and removes solids contained in water to be treated, A collision means on which the coarse bubbles collide; An acquisition means for acquiring displacement information of the collision means in a vertical direction; a specifying means for extracting a displacement frequency based on the displacement information and specifying an installation position of the collision means based on the displacement frequency.

2. 2. The detection device according to claim 1, wherein the displacement frequency is a frequency at which the coarse bubbles collide with the collision means.

3. 2. The detection device according to claim 1, wherein said displacement frequency is the number of times per unit time that said coarse bubbles collide with said collision means.

4. The detection device according to claim 1, characterized in that the identification means identifies the installation position of the collision means, which shows the displacement frequency that does not follow the aeration frequency, by comparing the aeration frequency of an aeration device that aerates the coarse bubbles with the displacement frequency.

5. The detection device according to claim 4, characterized in that the aeration device has a plurality of openings through which the coarse bubbles are aerated, and the identification means identifies a positional range of the openings through which the coarse bubbles that collide with the collision means whose installation position is identified.

6. 2. The detection device according to claim 1, wherein the collision means is suspended in the water to be treated.

7. 2. The apparatus of claim 1, wherein said acquiring means is integral with said impact means.

8. A wastewater treatment device that separates and removes solids contained in treated water, A solid-liquid separation membrane that separates and removes solids contained in the water to be treated; an aeration device for aerating coarse bubbles used for cleaning the solid-liquid separation membrane; A detection device for detecting the coarse bubbles, The detection device is characterized in that it comprises a collision means against which the coarse bubbles collide, an acquisition means for acquiring displacement information regarding the vertical direction of the collision means, and an identification means for extracting a displacement frequency based on the displacement information and identifying an installation position of the collision means based on the displacement frequency.

9. A detection method for detecting coarse bubbles used for cleaning a solid-liquid separation membrane that separates and removes solids contained in water to be treated, comprising: an acquiring step of acquiring displacement information in a vertical direction of a collision means against which the coarse bubbles collide; a step of extracting a displacement frequency based on the displacement information, and specifying an installation position of the collision means based on the displacement frequency.

10. A program for causing a computer to execute a detection method for detecting coarse bubbles used for cleaning a solid-liquid separation membrane that separates and removes solids contained in water to be treated, The detection method includes: an acquiring step of acquiring displacement information in a vertical direction of a collision means against which the coarse bubbles collide; a step of extracting a displacement frequency based on the displacement information, and specifying an installation position of the collision means based on the displacement frequency.

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