Ozone supply system, control method, and control program

Abstract

An ozone supply system (100) for supplying ozone gas to a pipe (200), which is a flow path for raw water, is provided with: an ozone supply unit (1) for generating ozone gas; an information acquisition unit (3) for acquiring information on the life cycle of a living organism living in the flow path; and a control unit (2) for determining an operation mode when the ozone gas is supplied from the ozone supply unit (1) to the flow path on the basis of the life cycle, and controlling the ozone supply unit (1) in accordance with the determined operation mode.

Description

Technical Field

[0001] The present disclosure relates to an ozone supply system, a control method, and a control program for supplying ozone gas to a pipe such as a water conduit and a water storage part such as a water tank through which raw water flows. Background Art

[0002] The pipes through which raw water flows need to be kept in a state where organisms present in the raw water do not adhere to the inner walls. If organisms adhere to the inner walls of the pipes, the flow of water will deteriorate, which may have a negative impact on the operation of equipment that uses raw water.

[0003] As one of the techniques for preventing organisms present in raw water flowing through a pipe from adhering to the inner wall of the pipe, there is a method of utilizing ozone gas (hereinafter sometimes referred to as ozone).

[0004] For example, Patent Document 1 discloses a technology for preventing biological deposits from adhering to the inner wall of a fresh water pipe by intermittently adding ozone to the inside of a pipe, thereby maintaining the total amount of ozone added at a specified level while suppressing the maximum concentration of ozone. Prior art literature Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-192901 Summary of the invention Technical problem to be solved by the invention

[0006] According to the technology described in Patent Document 1, since the maximum concentration of ozone is kept in a suppressed state, it is possible to suppress the influence of raw water to which ozone is added on the discharge environment and suppress the adhesion of organisms to the inner wall of the pipe.

[0007] In addition, all organisms have conditions suitable for survival, and the same is true for organisms in raw water. For example, the water clams considered to be biological attachments in Patent Document 1 are suitable for survival in water temperatures above 20°C. Since the number of organisms attached to the inner wall of the pipe depends on the number of organisms present in the water, it is considered effective to add ozone to inhibit the attachment of water clams when the water temperature is above 20°C. In other words, when the water temperature is lower than 20°C, the need to add ozone is low, and there is a problem that the impact on the emission environment caused by the addition of ozone becomes greater than necessary. In addition, the operating cost will also increase to a greater extent than necessary. Although the water clams are recorded as an example, other organisms also have water temperatures suitable for their survival. Generally speaking, when the water temperature is lower, the number of organisms present in the water will decrease.

[0008] In view of the above circumstances, an object of the present disclosure is to obtain an ozone supply system that can effectively utilize ozone to suppress the attachment of organisms to the inner wall of a pipe through which raw water flows. Technical means for solving technical problems

[0009] In order to solve the above-mentioned problems and achieve the above-mentioned purposes, the present invention discloses an ozone supply system for supplying ozone gas to a flow path of raw water, comprising: an ozone supply unit that generates ozone gas; an information acquisition unit that acquires information related to the life cycle of organisms living in the flow path; and a control unit that determines an action mode when supplying ozone gas from the ozone supply unit to the flow path based on the life cycle, and controls the ozone supply unit according to the determined action mode. Effects of the Invention

[0010] The ozone supply system according to the present disclosure has an effect of suppressing the adhesion of organisms to the inner wall of a pipe through which raw water flows by effectively utilizing ozone. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a diagram showing a configuration example of an ozone supply system according to an embodiment. Figure 2 This is a diagram showing an example of an operation mode applicable to the ozone supply system. Figure 3 This is a diagram showing an example of a downward injection type contact tank constituting an ozone water generating unit. Figure 4 This is a diagram showing another example of the downward injection type contact tank constituting the ozone water generating unit. Figure 5 This is a diagram showing a schematic structure of another example of a downward injection type contact tank constituting an ozone water generating unit. Figure 6 This is a diagram showing an overview of the overall operation of the ozone supply system. Figure 7 This is a flowchart showing the operation of the ozone supply system. Figure 8 This is a diagram showing a configuration example of a state determination unit when performing determination processing using machine learning. Fig. 9 is a diagram used to illustrate a neural network. Fig.10 This is a flowchart showing an example of the operation of the model generation unit. Fig.11 This is a flowchart showing an example of the operation of the determination unit. Fig.12 This is a diagram showing an example of hardware that realizes a control unit of the ozone supply system. DETAILED DESCRIPTION

[0012] Hereinafter, an ozone supply system, a control method, and a control program according to an embodiment of the present disclosure will be described in detail based on the drawings.

[0013] Implementation method. Figure 1 : is a diagram showing a structural example of an ozone supply system 100 according to an embodiment. The ozone supply system 100 is applied to, for example, an apparatus for performing hydroelectric power generation, and is a system for supplying ozone gas (hereinafter referred to as ozone) to a pipe 200, which is a flow path of raw water sucked in from a water source. Specifically, the ozone supply system 100 sucks in a portion of the raw water flowing through the pipe 200, injects ozone and returns it to the pipe 200, thereby adding ozone to the raw water flowing through the pipe 200. Thus, organisms living in the pipe 200 are prevented from attaching to the inner wall of the pipe 200, and when there are organisms attached to the inner wall, they are peeled off. In addition, in order to prevent the already peeled organisms from moving to the outside of the apparatus to which the ozone supply system 100 is applied and attaching or reproducing again in the pipe or the like at the destination of movement, the organisms living in the pipe 200 are killed by ozone.

[0014] like Figure 1 As shown, the ozone supply system 100 includes: an ozone supply unit 1 for generating ozone; a control unit 2 for controlling the ozone supply unit 1; an information acquisition unit 3, which is used to obtain observation results of raw water flowing through the pipeline 200, that is, observation result information; an ozone water generation unit 4, which is used to add ozone output from the ozone supply unit 1 to raw water to generate ozone water; and a pump 5 for sucking raw water from the pipeline 200.

[0015] The ozone supply unit 1 includes an oxygen supply unit 11, an ozone generator 12, an ozone storage unit 13, and an ozone injection unit 14. The oxygen supply unit 11 supplies oxygen to the ozone generator 12. The operation of the ozone generator 12 is controlled by the control unit 2, and uses the oxygen supplied from the oxygen supply unit 11 to generate ozone. The ozone storage unit 13 stores ozone generated in the ozone generator 12. The ozone injection unit 14 is controlled by the control unit 2, takes out ozone stored in the ozone storage unit 13, and injects ozone into the raw water sucked from the pipe 200 to the lower injection contact tank 41.

[0016] Any method can be used to store ozone in the ozone storage unit 13. The ozone storage unit 13 includes, for example, an adsorption cylinder filled with an adsorbent such as silica gel, in which ozone and oxygen are separated from a mixed gas containing ozone and oxygen by controlling temperature and pressure and utilizing the difference in adsorption and desorption characteristics of ozone and oxygen to the adsorbent. The ozone storage unit 13 selectively adsorbs and stores ozone through the adsorbent maintained at a low temperature, and on the other hand, the separated oxygen is supplied to the ozone generator 12 to reuse the separated oxygen.

[0017] The control unit 2 controls the ozone generator 12 and the ozone injection unit 14 constituting the ozone supply unit 1 based on the observation result information acquired by the information acquisition unit 3. Specifically, the control unit 2 determines whether the organisms living in the raw water have an increasing trend based on the observation result information acquired by the information acquisition unit 3, and controls the ozone generator 12 and the ozone injection unit 14 so that ozone is supplied to the lower injection contact tank 41 according to an operation mode corresponding to the determination result. The details of the observation result information acquired by the information acquisition unit 3 will be described separately, but an example of the observation result information is water temperature.

[0018] The ozone water generating unit 4 is composed of a downward injection type contact tank 41. The downward injection type contact tank 41 dissolves ozone in raw water by utilizing the height difference of the structure. The details of the downward injection type contact tank 41 will be described separately.

[0019] Figure 2 1 is a diagram showing an example of an action mode applied to the ozone supply system 100. It is known that organisms have a life cycle, and the reproduction period when the number of individuals increases will occur periodically. That is, the period when the number of individuals of the organism increases and the period when the number of individuals remains or decreases will repeat. With this in mind, the ozone supply system 100 supplies ozone while switching the action mode according to the life cycle of the target organism to prevent it from attaching to the inner wall of the pipe 200 as needed. For example, Figure 2 As shown, the ozone supply system 100 divides the operation period into a peak period corresponding to the breeding period when the number of organisms that may attach to the inner wall of the pipe 200 increases, and a non-peak period other than the breeding period, and adopts different action modes to supply ozone for each period.

[0020] exist Figure 2In the example shown, the system operates in the expulsion mode during the peak season and in the prevention mode during the non-peak season. The expulsion mode is an operation mode in which the amount of ozone supplied from the ozone supply unit 1 to the ozone water generation unit 4 is increased, high-concentration ozone water is generated in the ozone water generation unit 4, and discharged to the pipe 200. The concentration of the ozone water generated in the expulsion mode is set to a value such that the organisms attached to the pipe 200 are peeled off due to the escape action of ozone and then die. On the other hand, the prevention mode is an operation mode in which a smaller amount of ozone than that in the expulsion mode is supplied from the ozone supply unit 1 to the ozone water generation unit 4, low-concentration ozone water is generated in the ozone water generation unit 4, and discharged to the pipe 200. The concentration of the ozone water generated in the prevention mode is set to a value such that the organisms existing in the raw water do not attach to the inner wall of the pipe 200 due to the escape action of ozone and move downstream. The amount of ozone supplied from the ozone supply unit 1 to the ozone water generating unit 4 can be adjusted by providing a first period for supplying ozone and a second period for stopping the ozone supply, repeating these periods alternately, and changing the ratio of the length of the first period to the length of the second period. In addition, the concentration of ozone water is the concentration of ozone in raw water, that is, the amount of ozone contained in a unit volume of raw water. The concentration of ozone water generated by the ozone water generating unit 4 in each operation mode also considers the amount of raw water flowing through the pipe 200, and is determined in such a way that the ozone concentration of the raw water in the pipe 200 after the ozone water is discharged into the pipe 200 becomes a desired value.

[0021] In addition, Figure 2 In the example shown, in the expulsion mode executed during the peak period, as shown in the second stage, a stripping mode of producing a concentration of ozone water of a low concentration to the extent that the organisms attached to the inner wall of the pipe 200 are stripped off, and a killing mode of producing a concentration of ozone water of a high concentration to the extent that the organisms are killed is combined, and these modes are repeated periodically. In addition, the stripping mode is executed first. By combining the stripping mode and the killing mode, the organisms attached to the inner wall of the pipe 200 can be stripped off and then killed. That is, the organisms attached to the inner wall of the pipe 200 can be prevented from being killed in the attached state, and the state of the corpse attached to the wall surface can be prevented. In the prevention mode executed during the non-peak period, as shown in the third stage, the stripping mode and the state of stopping the generation of ozone water are combined, and these modes are repeated periodically. In addition, in the prevention mode, the stripping mode can be continued, and the low-concentration ozone water can be continued. In the case where the action in the prevention mode includes a state of stopping the generation of ozone water, the pump 5 that sucks raw water from the pipe 200 can also be stopped in the state of stopping the generation of ozone water. The concentration of the ozone water generated by the peeling mode in the prevention mode may be set to a value lower than the concentration of the ozone water generated by the peeling mode in the expulsion mode.

[0022] In the ozone supply system 100, the control unit 2 determines whether it is in the peak period or the non-peak period based on the observation result information obtained by the information acquisition unit 3. That is, the control unit 2 determines whether it meets the peak period of the target organism to be expelled and prevented from attaching based on the observation result information, and when it is judged to be the peak period, the action mode is determined to be the expulsion mode. Then, the control unit 2 controls the ozone generator 12 and the ozone injection unit 14 of the ozone supply unit 1 to repeat the generation of high-concentration ozone water and the generation of low-concentration ozone water. In addition, when it is judged to be the non-peak period, the control unit 2 determines the action mode to be the prevention mode. Then, the control unit 2 controls the ozone generator 12 and the ozone injection unit 14 of the ozone supply unit 1 to repeat the generation of low-concentration ozone water and the stop of the generation of ozone water, or continue the generation of low-concentration ozone water.

[0023] Examples of target organisms to be expelled and prevented from attaching are clams and caddisflies. The water temperature suitable for the survival of clams is above 20°C. If the water temperature reaches above 20°C, reproduction becomes vigorous and the number of individuals increases. In addition, the water temperature suitable for the survival of caddisflies is above 10°C. If the water temperature reaches above 10°C, reproduction becomes vigorous and the number of individuals increases. In the case where the target organisms are clams and caddisflies, for example, when the water temperature is above 10°C, the control unit 2 determines that it is a prosperous period, and when the water temperature is below 10°C, the control unit 2 determines that it is not a prosperous period. That is, in the presence of multiple target organisms, if at least one target organism is in a state of vigorous reproduction, the control unit 2 determines that it is a prosperous period. In addition, it is also possible to judge whether clams and caddisflies are in a prosperous period separately. For example, when the water temperature is above 20°C, the control unit 2 determines that it is the peak period of the river shell clam, when the water temperature is less than 20°C, the control unit 2 determines that it is the non-peak period of the river shell clam, when the water temperature is above 10°C, the control unit 2 determines that it is the peak period of the caddisfly, and when the water temperature is less than 10°C, the control unit 2 determines that it is the non-peak period of the caddisfly. Moreover, the control unit 2 can inject different amounts of ozone into the raw water during the peak period of the river shell clam and the peak period of the caddisfly, so that the concentration of the generated ozone water is different. In addition, organisms other than river shell clam and caddisfly can be added to the target organisms.

[0024] Next, the downward injection type contact tank 41 constituting the ozone water generating unit 4 will be described. Figure 3 FIG. 4 is a diagram showing an example of a downward injection type contact tank 41 constituting the ozone water generating unit 4. Figure 3In the invention, the water pipe 201 is set deep underground, and its purpose is to transport drinking water and various water (water conservancy) between two places far apart (for example, between area A and area B). The water pipe 201 is also used to transfer water bodies for water purification and to prevent river flooding. In addition, pump stations for water delivery are set at prescribed intervals in the water pipe 201. The pump 5 in the pump station draws raw water from the water pipe 201, performs filtering and other treatments, and returns the treated water to the water pipe 201 from the upper part of the vertical shaft several tens of meters deep. The ozone supply system 100 uses the existing vertical shaft set in the pump station, etc. to realize the lower injection contact tank 41. The cost can be reduced by using the existing vertical shaft.

[0025] When the lower injection contact groove 41 is set Figure 3 In the case of the structure shown, that is, when the existing vertical shaft is used as the lower injection contact tank 41, the ozone supply system 100 is provided with an ozone injection unit 14 so that ozone is discharged to the position where the treated water flows into the vertical shaft. Since a large amount of treated water flows into the vertical shaft, the ozone discharged from the ozone injection unit 14 flows into the vertical shaft as the lower injection contact tank 41 together with the treated water in the form of being sucked into the treated water. Thus, there is no need to set up a pump for injecting ozone. The ozone flowing into the lower injection contact tank 41 circulates in the U-shaped vertical shaft together with the treated water and is dissolved in the treated water. Thus, by using the existing vertical shaft and adding an inner tube to the vertical shaft to realize the U-shaped tube, there is no need to newly set up an ozone reaction tank equivalent to the lower injection contact tank 41, and the low cost of the system can be achieved. In addition, the contact time between ozone and treated water is fully ensured in the vertical shaft, and efficient dissolution of ozone in treated water can be achieved. Therefore, ozone water with uniform concentration can be produced and transported to the water pipe 201. Furthermore, since the generation of excess ozone can be suppressed, there is no need for equipment to treat excess ozone, so the system can be miniaturized and the cost can be further reduced.

[0026] Figure 4 FIG. 4 is a diagram showing another example of the downward injection type contact tank 41 constituting the ozone water generating unit 4 . Figure 4 An example of a bottom injection type contact tank 41 when the ozone supply system 100 is applied to a hydroelectric power generation system is shown. Figure 4 In the example shown, a bottom injection contact tank 41 is provided to suck in raw water 301 from the water pipe 202 or the hydraulic pipe 203. The structure of the bottom injection contact tank 41 is similar to Figure 3 The lower implantation contact groove 41 in the example shown is the same. Figure 5 As shown, ozone gas 302 is discharged from the ozone injection unit 14 to the position where the raw water 301 flows into the lower injection contact tank 41. Figure 5: is a diagram showing a schematic structure of another example of the lower injection type contact tank 41 constituting the ozone water generating unit 4. The ozone water 303 generated in the lower injection type contact tank 41 is transported to the water pipe 202 by the pump 6a and mixed with the raw water, and is transported to the turbine shaft cooling pipe and the transformer cooling pipe in the power plant by the pump 6b and mixed with the raw water. The position where the ozone water 303 is mixed with the raw water in the water pipe 202 is preferably near the water intake, but it may be a structure where the ozone water 303 is only transported to the water pipe 202 and mixed with the raw water, or it may be a structure where the ozone water 303 is only transported to the power plant, that is, it may be a structure where the ozone water 303 is transported to the turbine shaft cooling pipe and the transformer cooling pipe and mixed with the raw water. In addition, multiple positions for mixing the ozone water 303 with the raw water in the water pipe 202 may be set. For example, it may be set near the water intake of the water pipe 202, near the connection between the water pipe 202 and the hydraulic pipe 203.

[0027] Next, the overall operation of the ozone supply system 100 will be described. Figure 6 : is a diagram showing an overview of the overall operation of the ozone supply system 100. Figure 7 is a flowchart showing the operation of the ozone supply system 100. Figure 6 In the embodiment, a configuration example of the control unit 2 is also recorded. Figure 6 As shown, the control unit 2 includes a state judgment unit 21 and an action control unit 22. The state judgment unit 21 judges the living Figure 1 The state of the organisms in the duct 200 shown in FIG. 2 is shown in FIG. 2 . The operation control unit 22 controls the ozone generator 12 and the ozone injection unit 14 of the ozone supply unit 1 based on the determination result of the state determination unit 21 .

[0028] like Figure 7 As shown, the ozone supply system 100 first obtains the information required to perform the ozone supply operation (step S1). Specifically, the information acquisition unit 3 analyzes the flow through Figure 1 The raw water of the pipeline 200 shown in the figure is used to obtain the observation result information 400. Figure 6As shown, the information acquisition unit 3 acquires water quality, water temperature, water volume (water depth), ecological information, images, etc. as observation result information 400. Examples of water quality include DO (Dissolved Oxygen), BOD (Biochemical Oxygen Demand), TOC (Total Organic Carbon), etc. Ecological information is the ecology of organisms, such as information on the number of individuals of organisms living in raw water. DNA (Deoxyribonucleic Acid) of biological origin can be obtained as ecological information. In addition, ecological information can be the change amount, change rate, etc. of the number of individuals of organisms. The number of individuals of organisms is obtained by sampling the raw water and inspecting it visually, filtering the raw water with a filter device, etc. to extract organisms, etc. When the change amount, change rate, etc. of the number of individuals of organisms are used as observation result information 400, the information acquisition unit 3 stores the number of individuals of the organism each time the number of individuals of the organism is obtained, and calculates the change amount, change rate, etc. based on the stored past number of individuals and the latest number of individuals. The number of organisms may be the number of larvae or eggs, not the number of adults. The total number of adults, larvae, and eggs may be used as the number of organisms. The image is an image that can detect the type and number of organisms living in the raw water, such as an image that magnifies and photographs the raw water. In addition, the information acquisition unit 3 may acquire Figure 6 A part of the various information shown is used as the observation result information 400. For example, only the water temperature may be acquired as the observation result information 400, or the water temperature and the water quality may be acquired as the observation result information 400.

[0029] The ozone supply system 100 then determines whether it meets the peak period (step S2). Specifically, the state judgment unit 21 of the control unit 2 determines whether it meets the above-mentioned peak period based on the observation result information 400 obtained by the information acquisition unit 3 in step S1. Several examples are described about the method by which the state judgment unit 21 judges whether it meets the peak period. For example, when the water temperature is above a predetermined value, the state judgment unit 21 judges it as a peak period. It can also be set that when the state of the water temperature above the predetermined value lasts for a certain period of time, the state judgment unit 21 judges it as a peak period. It can also be set that when the water temperature is above a predetermined value and the change in water quality is above a predetermined value, the state judgment unit 21 judges it as a peak period. It can also be set that when the number of individuals of organisms existing in a prescribed range is above a predetermined number, the state judgment unit 21 judges it as a peak period. It can also be set that when the rate of increase in the number of individuals of organisms within a prescribed period is above a prescribed value, the state judgment unit 21 judges it as a peak period. Other methods can be used to determine whether it meets the peak period. Thus, the observation result information 400 is used to determine whether it is a peak growth period corresponding to the reproduction period included in the life cycle of the organism, and is information related to the life cycle of the organism. In addition, considering that the state of the raw water flowing through the pipeline 200 and the state of the organisms living in the pipeline 200 are affected by temperature changes, the information acquisition unit 3 can acquire weather forecast information as the observation result information 400. The acquired weather forecast information can be medium-term weather forecast information or long-term weather forecast information.

[0030] Returning to the description of the operation, the ozone supply system 100 performs the operation of the expelling mode to supply ozone (step S3) when the ozone supply period is in compliance with the peak period (step S2: yes). Specifically, the operation control unit 22 of the control unit 2 controls the ozone generator 12 and the ozone injection unit 14 of the ozone supply unit 1 to repeat the operation of Figure 2 The actions in the expulsion mode shown are the actions in the stripping mode for producing low-concentration ozone water and the actions in the killing mode for producing high-concentration ozone water. The actions in the expulsion mode continue until the peak period ends, that is, until it is determined that it does not meet the peak period. After executing step S3, the ozone supply system 100 returns to step S1.

[0031] In addition, when the ozone supply system 100 does not meet the peak period (step S2: No), the ozone supply system 100 performs the action of the prevention mode to supply ozone (step S4). Specifically, the action control unit 22 of the control unit 2 controls the ozone generator 12 and the ozone injection unit 14 of the ozone supply unit 1 to repeat the steps of Figure 2The action in the prevention mode shown is to continue the action of the stripping mode for producing low-concentration ozone water, or the action of the stripping mode for producing low-concentration ozone water and the action of stopping the production of ozone water. The action in the prevention mode continues until the end of the non-peak period, that is, until it is determined to be in the peak period. After executing step S4, the ozone supply system 100 returns to step S1.

[0032] The period from the execution of the above step S3 or S4 to the next execution of step S1 is several days to several weeks. The length of this period can be variable. For example, it can be set to a length corresponding to the water temperature, specifically, the period is shortened when the water temperature is high, and the period is extended when the water temperature is low.

[0033] In the above step S2, the state determination unit 21 may use machine learning when determining whether it meets the peak hair growth period.

[0034] Figure 8 2 is a diagram showing a configuration example of the state determination unit 21 when performing determination processing using machine learning.

[0035] Figure 8 The state determination unit 21 shown includes a model generation unit 211 , a learned model storage unit 212 , and a determination unit 213 .

[0036] The model generation unit 211 uses the learning data generated based on the information acquired by the information acquisition unit 3 to learn the correspondence between the observation result information acquired by the information acquisition unit 3 and the peak hair period. That is, the model generation unit 211 generates a learning completion model for inferring whether the observation result information acquired from the information acquisition unit 3 corresponds to the peak hair period based on the learning data.

[0037] Here, the learning data is data obtained by correlating the observation result information with the judgment result of whether it is in the peak period. The judgment result included in the learning data is, for example, the operator actually confirms that the flow Figure 1 The state of the raw water in the pipe 200 shown, the state of the inner wall of the pipe 200, etc., and whether it is in the peak period are generated. The learning data is generated by associating the judgment result with the observation result information acquired by the information acquisition unit 3 when generating the judgment result.

[0038] The learning algorithm used by the model generation unit 211 may be a well-known algorithm such as supervised learning, unsupervised learning, and reinforcement learning. As an example, a case where a neural network is applied will be described.

[0039] The model generation unit 211 learns the correspondence between the observation result information and the peak hair growth period through so-called supervised learning, for example, based on the neural network model. Here, so-called supervised learning refers to a method of providing a data set of input and result (label) as learning data to the neural network, thereby learning the characteristics of the learning data and inferring the result based on the input.

[0040] A neural network includes an input layer consisting of multiple neurons, an intermediate layer (hidden layer) consisting of multiple neurons, and an output layer consisting of multiple neurons. The intermediate layer can be one or more than two layers.

[0041] Fig. 9 is a diagram used to illustrate a neural network. For example, if Fig. 9 In the three-layer neural network shown in the figure, when multiple inputs are input to the input layer X (X1-X3), the value is multiplied by the weight W1 (w11-w16) and input to the intermediate layer Y (Y1-Y2), and the result is multiplied by the weight W2 (w21-w26) and output from the output layer Z (Z1-Z3). The output result changes according to the values ​​of weight W1 and weight W2.

[0042] The neural network used in the model generation unit 211 of the state judgment unit 21 learns the state of the target organism corresponding to the observation result information, that is, whether the target organism is in the peak period or the non-peak period, through the so-called supervised learning based on the learning data generated based on the observation result information obtained by the information acquisition unit 3.

[0043] The learned model storage unit 212 stores the learned model generated by the model generation unit 211 .

[0044] When receiving the observation result information from the information acquisition unit 3 in a state where the learned model storage unit 212 stores the learned model, the determination unit 213 determines whether it is the peak growth period of the target organism using the learned model.

[0045] Next, use Fig.10 The operation of the model generation unit 211 generating a learned model will be described. Fig.10 : is a flowchart showing an example of the operation of the model generation unit 211 .

[0046] First, the model generation unit 211 obtains learning data (step S11). Specifically, the learning data is obtained by associating the observation result information obtained by the information acquisition unit 3 with the information on whether the target organism is in the peak period of growth. The learning data can be generated by the information acquisition unit 3, or the processing unit that generates the learning data can be set inside the state judgment unit 21.

[0047] Next, the model generation unit 211 performs a learning process (step S12). Specifically, the model generation unit 211 learns the relationship between the observation result information and the state of the target organism through so-called supervised learning based on the learning data obtained in step S11, and generates a learning completion model. In addition, the supervised data here corresponds to data indicating the state of the target organism, that is, whether it is in the peak period or non-peak period of the target organism.

[0048] When the model generation unit 211 completes the generation of the learned model, it outputs the generated learned model to the learned model storage unit 212, and the learned model storage unit 212 stores the learned model received from the model generation unit 211 (step S13).

[0049] Next, use Fig.11 The operation of the determination unit 213 in determining the state of the target living being will be described. Fig.11 2 is a flowchart showing an example of the operation of the determination unit 213 .

[0050] First, the determination unit 213 acquires determination data for determining the state of the target organism (step S21 ). Specifically, the determination unit 213 acquires the observation result information output from the information acquisition unit 3 as the determination data.

[0051] Next, the judgment unit 213 uses the judgment data obtained in step S21 and the learning model stored in the learning model storage unit 212 to judge whether it meets the peak period of the target organism (step S22). Specifically, the judgment unit 213 inputs the observation result information obtained in step S21 into the learning model stored in the learning model storage unit 212, and then obtains the information output from the learning model indicating whether it is in the peak period of the target organism.

[0052] In addition, in the present embodiment, an example is described in which the model generation unit 211 generates a learning completion model for inferring whether the target organism's active period is met based on the observation result information. However, the learning completion model may also be a structure that infers the concentration of ozone gas (the amount of ozone gas output per hour) output by the ozone supply unit 1 to the ozone water generation unit 4 when inferring whether the target organism's active period is met, or a structure that infers the concentration of ozone water generated by the ozone water generation unit 4. In addition, the learning completion model may be a structure that infers the concentration of ozone gas or ozone water supplied in each of the stripping mode and the killing mode of the expelling mode executed during the active period of the target organism, or a structure that infers the length of the period of action in the stripping mode and the length of the period of action in the killing mode. Similarly, the learning completion model may be a structure that infers the concentration of ozone gas or ozone water supplied in the stripping mode of the prevention mode executed during the non-active period of the target organism, or a structure that infers the length of the period of action in the stripping mode. The learned model may be configured to infer the concentration of the ozone gas or ozone water supplied in each operation mode and the length of the operation period in each operation mode.

[0053] Even in the case where the control unit 2 is implemented without using machine learning, similarly, the control unit may be a structure that determines the concentration of ozone gas output from the ozone supply unit 1 to the ozone water generation unit 4 when judging whether it meets the peak period of the target organism based on the observation result information output from the information acquisition unit 3, and may also be a structure that determines the concentration of ozone water generated by the ozone water generation unit 4. In addition, the control unit 2 may be a structure that determines the concentration of ozone gas or ozone water supplied in each of the stripping mode and the killing mode that constitute the expelling mode executed during the peak period of the target organism, and may also be a structure that determines the length of the period of operation in the stripping mode and the length of the period of operation in the killing mode. The control unit 2 may be a structure that determines the concentration of ozone gas or ozone water supplied in the stripping mode that constitutes the prevention mode executed during the non-peak period of the target organism, and may also be a structure that determines the length of the period of operation in the stripping mode. The control unit 2 may be a structure that determines the concentration of ozone gas or ozone water supplied in each action mode and the length of the period of operation in each action mode.

[0054] In addition, in the present embodiment, an example has been described in which the state determination unit 21 includes the model generation unit 211, but the model generation unit 211 may be disposed outside the state determination unit 21 to perform machine learning and generate a learning completion model. In addition, the learning completion model used to determine whether the target organism's growth period is met may be generated outside the ozone supply system 100, and the generated learning completion model may be acquired via a communication network or the like.

[0055] In addition, in the present embodiment, the case where supervised learning is applied to the learning algorithm used by the model generation unit 211 has been described, but the learning algorithm is not limited thereto. Regarding the learning algorithm, in addition to supervised learning, reinforcement learning, unsupervised learning, semi-supervised learning, etc. can also be applied. As a learning algorithm, deep learning (Deep Learning) for extracting the learning feature quantity itself can also be used, and machine learning can also be performed according to other well-known methods such as genetic programming, functional logic programming, support vector machines, etc.

[0056] Next, hardware for realizing the control unit 2 of the ozone supply system 100 will be described. Fig.12 FIG. 1 is a diagram showing an example of hardware for realizing the control unit 2 of the ozone supply system 100. The control unit 2 may be composed of Fig.12 The processor 91, memory 92 and interface circuit 93 shown are implemented.

[0057] The processor 91 is a CPU (also referred to as a central processing unit, a central processing device, a processing device, an arithmetic device, a microprocessor, a microcomputer, a DSP (digital signal processor)), a system LSI (large scale integration), etc. The memory 92 is a RAM (random access memory), a ROM (read only memory), an EPROM (erasable programmable read-only memory), an EEPROM (registered trademark) (electrically erasable programmable read-only memory), a hard disk drive, etc. The interface circuit 93 is a circuit for the control section 2 to perform data exchange, etc. between the ozone supply section 1 and the information acquisition section 3.

[0058] The state determination unit 21 and the action control unit 22 of the control unit 2 are implemented by executing a program for operating as the above-mentioned parts by the processor 91. The program for operating as the state determination unit 21 and the action control unit 22 is pre-stored in the memory 92. The processor 91 reads the above-mentioned program from the memory 92 and executes it, thereby operating as the state determination unit 21 and the action control unit 22.

[0059] In addition, it is assumed that the program for the state determination unit 21 and the action control unit 22 to perform the operation is pre-stored in the memory 92, but it is not limited to this. The above program can be in the following form: it is provided to the user of the control unit 2 in a state of being written to a recording medium such as a CD (Compact Disc)-ROM, a DVD (Digital Versatile Disc: Digital Versatile Disc)-ROM, and the user can install the above program in the memory 92. In this case, the hardware that realizes the control unit 2 also includes a reading device for reading the program from the recording medium. It can also be in the following form: the reading device is connected to the interface circuit 93 to install the program.

[0060] in addition, Fig.12 The processor 91, memory 92 and interface circuit 93 shown in the figure may be hardware constituting an electronic computer. That is, the control unit 2 of the ozone supply system 100 may be realized by an electronic computer and a program executed by the electronic computer.

[0061] As described above, the ozone supply system 100 of the present embodiment determines the state of the target organisms to be prevented from attaching to the inner wall of the pipe 200, specifically, whether it meets the state of vigorous reproduction and an increase in the number of individuals, that is, the peak period, based on the observation results of the raw water flowing through the pipe 200, and supplies ozone according to different action modes in the peak period and the non-peak period. In the peak period, the following actions are alternately repeated, namely: the action of supplying ozone in a manner that the raw water in the pipe 200 becomes ozone water with a concentration that allows the organisms attached to the inner wall of the pipe 200 to be peeled off from the wall surface without being killed; and the action of supplying ozone in a manner that the raw water in the pipe 200 becomes ozone water with a concentration that can kill the organisms in the pipe 200. During the off-peak period, the operation of supplying ozone in such a manner that the raw water in the pipe 200 becomes ozone water having a concentration that can prevent organisms from attaching to the inner wall of the pipe 200 is continuously performed, or the following operations are repeated alternately, namely, the operation of supplying ozone in such a manner that the raw water in the pipe 200 becomes ozone water having a concentration that can prevent organisms from attaching to the inner wall of the pipe 200, and the supply of ozone is stopped. Thus, ozone can be effectively used to peel off organisms attached to the inner wall of the pipe 200, and the organisms can be prevented from attaching to the inner wall of the pipe 200. In addition, since the attached organisms can be peeled off and the attachment of the organisms can be prevented, it is not necessary for the operator to manually remove the organisms attached to the inner wall of the pipe 200, thereby reducing the burden on the operator who performs maintenance inspections, etc.

[0062] The structures shown in the above embodiments are merely examples of the contents of the present invention, and may be combined with other known technologies, or a part of the structures may be omitted or modified within the scope not departing from the gist of the present invention. Description of symbols

[0063] 1 ozone supply unit, 2 control unit, 3 information acquisition unit, 4 ozone water generation unit, 5, 6a, 6b pumps, 11 oxygen supply unit, 12 ozone generator, 13 ozone storage unit, 14 ozone injection unit, 21 state judgment unit, 22 action control unit, 41 lower injection contact tank, 100 ozone supply system, 200 pipeline, 201, 202 water pipe, 203 water pressure pipe, 211 model generation unit, 212 learning completion model storage unit, 213 judgment unit, 301 raw water, 302 ozone gas, 303 ozone water, 400 observation result information.

Claims

1. An ozone supply system for supplying ozone gas to a flow path of raw water, characterized in that: include: an ozone supply unit that generates ozone gas; an information acquisition unit that acquires information related to a life cycle of an organism living in the flow path; as well as A control unit determines an operation mode when the ozone supply unit supplies ozone gas to the flow path based on the life cycle, and controls the ozone supply unit according to the determined operation mode.

2. The ozone supply system according to claim 1, characterized in that: The control unit determines at least one of a concentration, a supply frequency, and a continuous supply time of the ozone gas supplied from the ozone supply unit to the flow path when determining the operation mode.

3. The ozone supply system according to claim 1 or 2, characterized in that: The information acquired by the information acquisition unit includes information indicating whether the organism is in a period of growth. When the growth period of the organism is in progress, the control unit controls the ozone supply unit so that the concentration of the ozone gas supplied to the flow path is higher than when the growth period of the organism is not in progress.

4. The ozone supply system according to claim 3, characterized in that: When the organism is in the peak growth period, the control unit controls the ozone supply unit so that the concentration of the ozone gas reaches a concentration for the purpose of killing the organism. When the organism is not in the peak growth period, the control unit controls the ozone supply unit so that the concentration of the ozone gas reaches a concentration for the purpose of inhibiting the organism from attaching to the flow path.

5. The ozone supply system according to any one of claims 1 to 4, characterized in that: comprising an ozone water generating unit that adds the ozone gas to the raw water sucked from the flow path to generate ozone water, and discharges the ozone water into the flow path, The ozone water generating unit is configured by a bottom injection type contact tank having a height difference and dissolving the ozone gas in raw water using the height difference.

6. The ozone supply system according to claim 5, characterized in that: When there is an existing vertical well in the flow path, the vertical well is used as the bottom injection contact groove.

7. The ozone supply system according to any one of claims 1 to 6, characterized in that: The information acquired by the information acquisition unit includes the temperature of the raw water.

8. The ozone supply system according to claim 7, characterized in that: The information acquired by the information acquisition unit further includes at least one of the water quality of the raw water, the amount of the raw water, the number of individuals of the organisms, the amount of change in the number of individuals of the organisms, and weather forecast information.

9. The ozone supply system according to any one of claims 1 to 8, characterized in that: The control unit determines the operation mode using a learning model generated by learning a correspondence relationship between the information on the life cycle and the operation mode and the information acquired by the information acquisition unit.

10. A control method, wherein a control unit of an ozone supply system controls the ozone supply unit to supply ozone gas generated by the ozone supply unit to a flow path of raw water, the control method comprising: A first step of acquiring information related to the life cycle of organisms living in said flow path; A second step of determining an operation mode when supplying ozone gas to the flow path based on the life cycle; and A third step is to control the ozone supply unit according to the operation mode determined in the second step.

11. A control program, characterized in that: Make the computer execute the following steps, namely: The first step is to obtain information related to the life cycle of organisms living in the flow path of raw water; A second step of determining an operation mode when the ozone supply unit supplies ozone gas to the flow path based on the life cycle; and A third step is to control the ozone supply unit according to the operation mode determined in the second step.

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