Residual chlorine management device, residual chlorine management method, residual chlorine management system, and residual chlorine management program

Abstract

To provide technology for simple and rational control of drainage time.SOLUTION: A residual chlorine management device includes a time-to-reach model estimation unit that estimates a time-to-reach model using the flow velocity of tap water after drainage begins and the flow velocity of tap water before drainage begins in a predetermined water supply route, to determine the time required for tap water at any point in the water supply system to reach the drainage point, and a limit concentration point identification unit that identifies the location of tap water on the water supply system that is expected to reach the drainage point while maintaining a predetermined residual chlorine concentration after the arrival time has elapsed, and a drainage time estimation unit that uses the model to determine the arrival time required for the tap water at the limit concentration point to reach the drainage point and estimates the time for continuing drainage at the drainage point.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a residual chlorine management device, a residual chlorine management method, a residual chlorine management system, and a residual chlorine management program. [Background technology]

[0002] It is known that the residual chlorine concentration in tap water decreases over time in the distribution pipe network that runs from the water purification plant to each consumer. In routes with a large volume of tap water, it is relatively easy to maintain a residual chlorine concentration above the specified standard because the water flows frequently, but in routes where the water tends to stagnate, it is necessary to forcibly drain the water at appropriate times to prevent a decrease in the residual chlorine in the tap water. However, because wastewater is non-revenue water, meaning that it is a water resource that cannot be used effectively, it is desirable to keep the amount of water discharged and the time it takes to discharge it to a minimum.

[0003] Patent Document 1 describes a water dumping device comprising a wastewater pipe connected to a water supply distribution pipe buried underground, an electromagnetic valve installed on the wastewater pipe, a control unit that controls the opening and closing of the electromagnetic valve, a power supply unit that supplies power to the control unit, and a storage container installed above ground that houses the control unit and the power supply unit, the end of the wastewater pipe being installed in a drainage system, and which dumps water into the drainage system when the electromagnetic valve is opened by the control unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-170376 Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned drainage device is thought to be capable of remote control of drainage because it can control the drainage of water into the drainage system using a solenoid valve. While it is disclosed that the solenoid valve closes when the water quality detected by the water quality sensor falls within the water quality standard range, it is not practical to operate the water quality sensor constantly and use it to close the solenoid valve in real time, so the situations in which it can be used are limited. Furthermore, it is disclosed that the drainage valve closes when a predetermined time has elapsed since the start of drainage, but no reasonable method for determining that predetermined time has been disclosed.

[0006] The present invention has been made in view of the above points, and aims to provide a technique for simply and rationally controlling the drainage time. [Means for solving the problem]

[0007] The present application includes a number of means for solving at least part of the above problems, examples of which are as follows.

[0008] In order to solve the above problems, one embodiment of the present invention provides a residual chlorine management device that includes a required arrival time model estimation unit that estimates a model for determining the required time for tap water from any point on the water supply to reach the discharge point using the flow rate of tap water after discharge begins in a specified water supply route and the flow rate of tap water before discharge begins; a limit concentration point identification unit that identifies, on the water supply, the position of tap water on the water supply that is expected to reach the discharge point while maintaining a specified residual chlorine concentration after the required arrival time has elapsed, as a limit concentration point; and a drainage time estimation unit that uses the model to determine the required arrival time for tap water from the limit concentration point to reach the discharge point, and estimates it as the time for drainage to continue at the drainage point.

[0009] In the residual chlorine control device, the required arrival time model estimating unit may use a distance from the arbitrary point to the discharge point in the process of estimating the model.

[0010] In the residual chlorine control device, the limit concentration point specifying unit may estimate the residual chlorine concentration in accordance with the required time to reach the limit concentration point in the process of specifying the limit concentration point.

[0011] In addition, in the above-mentioned residual chlorine management device, the process of estimating the residual chlorine concentration may include a residual salt concentration reduction model estimation unit that estimates a residual salt concentration reduction model that shows the change in the residual chlorine concentration over time, and the limit concentration point identification unit may estimate the residual chlorine concentration using the residual salt concentration reduction model.

[0012] In addition, in the above-mentioned residual chlorine management device, the residual salt concentration reduction model estimation unit may estimate a residual salt concentration reduction coefficient used in a trained model trained using actual values of the residual chlorine concentration in the water supply route, using predetermined characteristic values of tap water upstream of the water supply.

[0013] In addition, another aspect of the present invention is a residual chlorine management method that uses a residual chlorine management device, and is characterized in that the residual chlorine management device carries out the following steps: a required arrival time model estimation step that uses the flow rate of tap water in a specified water supply route after discharge begins and the flow rate of tap water before discharge begins to estimate a model that determines the required time for tap water from any point on the water supply to reach the discharge point; a limit concentration point identification step that identifies on the water supply a position of tap water on the water supply that is expected to reach the discharge point while maintaining a specified residual chlorine concentration after the required arrival time has elapsed, as a limit concentration point; and a drainage time estimation step that uses the model to identify the required arrival time for tap water from the limit concentration point to reach the discharge point, and estimates it as the time for drainage to continue at the drainage point.

[0014] In addition, another aspect of the present invention is a residual chlorine management system that uses a residual chlorine management device, and is characterized by carrying out the following steps: a required arrival time model estimation step that uses the flow rate of tap water in a specified water supply route after discharge begins and the flow rate of tap water before discharge begins to estimate a model that determines the required time for tap water from any point on the water supply to reach the discharge point; a limit concentration point identification step that identifies on the water supply a position of tap water on the water supply that is expected to reach the discharge point while maintaining a specified residual chlorine concentration after the required arrival time has elapsed, as a limit concentration point; and a drainage time estimation step that uses the model to identify the required arrival time for tap water from the limit concentration point to reach the discharge point and estimate it as the time for drainage to continue at the drainage point.

[0015] In addition, another aspect of the present invention is a residual chlorine management program that causes an information processing device to manage residual chlorine, and is characterized in that the processing unit of the information processing device performs the following steps: a required arrival time model estimation step that uses the flow rate of tap water in a specified water supply route after drainage begins and the flow rate of tap water before drainage begins to estimate a model that determines the required time for tap water from any point on the water supply to reach the drainage point; a limit concentration point identification step that identifies on the water supply a position of tap water on the water supply that is expected to reach the drainage point while maintaining a specified residual chlorine concentration after the required arrival time has elapsed, as a limit concentration point; and a drainage time estimation step that uses the model to identify the required arrival time for tap water from the limit concentration point to reach the drainage point, and estimate it as the time for drainage to continue at the drainage point. [Effects of the Invention]

[0016] According to the present invention, a technique for simply and rationally controlling the drainage time can be provided.

[0017] Problems, configurations, effects, and the like other than those described above will become clear from the following description of the embodiments. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a diagram showing an example of an overview of a residual chlorine management system. [Figure 2] 1 is a diagram illustrating an example of the configuration of a residual chlorine management system. [Figure 3] FIG. 2 is a diagram illustrating an example of a hardware configuration of a residual chlorine control device. [Figure 4] FIG. 10 is a diagram illustrating an example of a drainage time estimation process. [Figure 5] FIG. 10 is a diagram showing an example of a change in flow rate after the start of drainage. [Figure 6] FIG. 10 is a diagram showing an example of the required time for water to reach the water level before and after the start of water discharge. [Figure 7] FIG. 10 is a diagram showing an example of a residual salt concentration graph. [Figure 8] FIG. 10 is a diagram showing an example of a setting screen for drainage time estimation processing. [Figure 9] FIG. 10 is a diagram illustrating an example of a residual salt concentration reduction model estimation process. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] FIG. 1 is a diagram showing an example of a residual chlorine management system. In this example, the residual chlorine management system 1 is an example of a system that manages the residual chlorine concentration in a water supply system. The user refers to the water supply management personnel or those who assist the management personnel. In order to ensure the quality of water supplied to consumers, the water supply system must meet several inspection standards, including at least the residual chlorine concentration. For simplicity, this example focuses on the residual chlorine concentration as the inspection standard, but the present invention is not limited to this and can be similarly applied to other inspection items (e.g., bacteria, compounds, surfactants, pH value, turbidity, odor, color, etc.).

[0021] In the residual chlorine management system 1, an administrator performs management operations on the residual chlorine management device 200 from an administrator terminal 100 via a network 50 using an API (Application Programming Interface) or the like. In addition, a water quality detection device 300 installed at the water distribution block entrance P0 and a discharge point P1 (separated by a distance L on the flow path) and a flow rate detection device 400 installed at the discharge point P1 transmit the results of detection of the water quality and flow rate of tap water to the residual chlorine management device 200 via the network 50 at predetermined times (for example, once an hour).

[0022] Furthermore, it is desirable that the manager terminal 100 is a highly portable information processing device such as a smartphone, a PDA (Personal Digital Assistant), a PC (Personal Computer), or a tablet terminal that can communicate via the network 50. The functions of the manager terminal 100 and the residual chlorine control device 200 are realized by software that runs on an OS (Operating System).

[0023] 2 is a diagram showing an example of the configuration of a residual chlorine management system. The residual chlorine management system 1 in this embodiment includes a manager terminal 100, a residual chlorine management device 200 communicably connected to the manager terminal 100 via wired or wireless communication, a water quality detection device 300 communicably connected to the residual chlorine management device 200 via wired or wireless communication, and a flow velocity detection device 400.

[0024] The administrator terminal 100 is basically an information processing device used by the administrator himself or herself, or an information processing device loaned to him or her by the company or organization to which he or she belongs for business purposes. In this embodiment, the person using the administrator terminal 100 is the administrator of water quality for the water supply system.

[0025] The network 50 is, for example, the Internet or an intranet. However, the network 50 is not limited to this and may also be a WAN (Wide Area Network), a mobile phone network, or a communication network that combines these. Alternatively, the network 50 may be a VPN (Virtual Private Network) on a wireless communication network such as a mobile phone communication network.

[0026] The residual chlorine control device 200 is an information processing device such as a server device, etc. The residual chlorine control device 200 and the manager terminal 100 are connected via a network 50.

[0027] The administrator terminal 100 includes at least a processing unit 120, a display unit 130, an input unit 131, and a communication unit 140. The processing unit 120 includes a browser processing unit 121 and realizes a so-called browser function. For example, the browser processing unit 121 logs in to an administrator view provided by the residual chlorine management device 200 and controls operation inputs for viewing management information and for management control. The communication unit 140 communicates with other devices via wired communication or wireless communication. For example, the communication unit 140 participates in and communicates with the network 50 via various wired communication cables such as a wired LAN (Local Area Network) cable or via radio waves of a wireless LAN.

[0028] The residual chlorine control device 200 includes a memory unit 210, a processing unit 220, and a communication unit 240. The memory unit 210 stores water quality data 211 and flow velocity data 212.

[0029] The water quality data 211 is data that records in chronological order the water quality detected by the water quality detection device 300. The flow velocity data 212 is data that records in chronological order the flow velocity of tap water detected by the flow velocity detection device 400.

[0030] The processing unit 220 realizes application functions. The processing unit 220 includes an arrival time model estimation unit 221, a limit concentration point identification unit 222, a drainage time estimation unit 223, and a residual salt concentration reduction model estimation unit 224.

[0031] The arrival time model estimation unit 221 estimates an arrival time identification model that identifies the time required for the tap water at an arbitrary point on the water supply pipe to reach the drainage point using the flow velocity of the tap water after the start of drainage and the flow velocity of the tap water before the start of drainage in a predetermined water supply pipe route. Note that the arrival time model estimation unit 221 uses the distance from an arbitrary point to the drainage point in the process of estimating the arrival time identification model.

[0032] Specifically, for the tap water in the water supply pipe, the arrival time model estimation unit 221 sets the flow velocity before the start of drainage as v1, the flow velocity after the start of drainage as v´1 (v1 < v´1), and at the start of drainage, the point P is at a distance of x in the direction from P0 to P1. x (x < L), and the water W x Then, the time t required for W x to reach from P0 to P1 is calculated by the following formula (1).

[0033]

Equation

[0034] The limit concentration point identification unit 222 identifies, on the water supply pipe, the position of the tap water that is expected to reach the drainage point while maintaining a predetermined residual chlorine concentration after the passage of the arrival time as the limit concentration point. Note that the limit concentration point identification unit 222 estimates the residual chlorine concentration according to the arrival time in the process of identifying the limit concentration point. Specifically, the limit concentration point identification unit 222 estimates the residual chlorine concentration using the residual salt concentration reduction model estimated by the residual salt concentration reduction model estimation unit 224.

[0035] The drainage time estimation unit 223 specifies the time required for the tap water at the critical concentration point to reach the drainage point using a model (drainage time estimation model), and estimates this as the time for which drainage at the drainage point will continue.

[0036] In the process of estimating the residual chlorine concentration, the residual salt concentration reduction model estimation unit 224 estimates a residual salt concentration reduction model that indicates changes in the residual chlorine concentration over time. Note that the residual salt concentration reduction model estimation unit 224 estimates the residual salt concentration reduction coefficient k used in the trained model trained using actual values of the residual chlorine concentration in the water supply route, using predetermined feature values of tap water upstream of the water supply route.

[0037] Specifically, the residual salt concentration reduction model estimation unit 224 calculates W x The residual salt concentration reduction coefficient k included in the residual salt concentration reduction model is estimated using predetermined characteristic values (water temperature, time of day, season, turbidity, pH, electrical conductivity, etc.) of upstream tap water (for example, a water purification plant). The residual salt concentration reduction coefficient k is a coefficient used in the residual chlorine concentration calculation formula shown in the following formula (2).

[0038]

number

[0039] where C t is the residual salt concentration after time t has elapsed, and C0 is the initial residual salt concentration. The residual salt concentration reduction coefficient k is the C t By applying the actual values of and C0 to the above equation (2), the values at the time of obtaining the actual values can be obtained.

[0040] To use the above formula (2) to estimate the residual chlorine concentration under different characteristic value conditions, the residual salinity reduction coefficient k under different characteristic value conditions is required. To this end, the residual salinity reduction model estimation unit 224 first calculates the residual salinity reduction coefficient k based on past performance data (measured actual values). The residual salinity reduction model estimation unit 224 then estimates the residual salinity reduction coefficient k under different characteristic value conditions using a trained model (residual salinity reduction coefficient estimation model) obtained through machine learning (or deep learning) using the past residual salinity reduction coefficient k calculated through actual value measurement as the objective variable and predetermined characteristic values (e.g., water temperature, time of day, season, turbidity, pH, electrical conductivity, etc.) of upstream tap water (e.g., a water purification plant) in the most recent past that correlate with each residual salinity reduction coefficient k as explanatory variables. The residual salinity reduction model estimation unit 224 then applies the estimated residual salinity reduction coefficient k to the residual salinity reduction model to estimate the residual chlorine concentration under different characteristic value conditions.

[0041] The communication unit 240 communicates with other devices via wired or wireless communication. For example, the communication unit 240 participates in the network 50 and communicates via various wired communication cables such as a wired LAN (Local Area Network) cable or via radio waves of a wireless LAN.

[0042] The water quality detection device 300 includes at least a processing unit 320, a water quality detection unit 330, and a communication unit 340. The processing unit 320 includes a water quality reporting unit 321. The water quality reporting unit 321 processes the water quality information detected by the water quality detection unit 330 into data to be reported as water quality data and transmits the data to the residual chlorine control device 200 via the communication unit 340. The water quality detection unit 330 uses a predetermined sensor to detect the test subject according to predetermined water quality test items and identifies predetermined water quality characteristic values (e.g., residual chlorine concentration, bacteria, compounds, surfactants, pH value, turbidity, odor, color, etc.). The communication unit 340 participates in and communicates with the network 50 via various wired communication cables such as a wired LAN (Local Area Network) cable or via wireless LAN radio waves.

[0043] The flow velocity detection device 400 includes at least a processing unit 420, a flow velocity detection unit 430, and a communication unit 440. The processing unit 420 includes a flow velocity reporting unit 421. The flow velocity reporting unit 421 processes information on the flow velocity detected by the flow velocity detection unit 430 into data to be reported as flow velocity data, and transmits the data to the residual chlorine control device 200 via the communication unit 440. The flow velocity detection unit 430 detects the flow velocity at the inspection point using a predetermined flow velocity sensor. The communication unit 440 participates in and communicates with the network 50 via various wired communication cables such as a wired LAN (Local Area Network) cable or via radio waves of a wireless LAN.

[0044] 3 is a diagram showing an example of the hardware configuration of a residual chlorine control device 200. The residual chlorine control device 200 has a processor 11, a memory 12, a storage 13, and a communication device 14, and each component is connected by a bus.

[0045] The processor 11 is an arithmetic device such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), and executes processing according to a program recorded in the memory 12 or the storage 13. In the residual chlorine management device 200, processing is performed by the processor 11 operating according to a program read onto the memory 12 or the storage 13. The processing unit 220, the arrival time model estimation unit 221, the limit concentration point identification unit 222, the drainage time estimation unit 223, and the residual salt concentration reduction model estimation unit 224 each realize their respective functions by the processor 11 executing the program.

[0046] The memory 12 is a storage device such as a RAM (Random Access Memory) or a flash memory, and functions as a storage area from which programs and data are temporarily read. The storage 13 is a writable and readable storage device. The function of the storage unit 210 is realized by the memory 12 or the storage 13. Note that the function of the storage unit 210 may be realized by a storage device connected via the communication device 14.

[0047] The communication device 14 is an interface for connecting the residual chlorine control device 200 to an external device for communication. For example, the communication device 14 performs wireless communication using an antenna that can use a predetermined radio wave (e.g., 5 GHz band, 2.4 GHz band, etc.) that establishes a connection with the administrator terminal 100 according to the Wi-Fi standard. Alternatively, the communication device 14 performs wired communication using a wire such as optical fiber or twisted pair cable.

[0048] The processing of each component of the residual chlorine control device 200 may be executed by one piece of hardware or by multiple pieces of hardware. Furthermore, the processing of each component of the residual chlorine control device 200 may be realized by one program or by multiple programs.

[0049] The manager terminal 100 has roughly the same hardware configuration as the residual chlorine control apparatus 200. However, like a typical smartphone, the manager terminal 100 often includes input / output devices such as a touch panel display and a microphone.

[0050] Next, we will explain the flow of the drainage time estimation process in the residual chlorine management system 1. Figure 4 is a diagram showing an example of the drainage time estimation process in the residual chlorine management system 1. The drainage time estimation process is a process that takes the water distribution block entrance and the drainage point as input and estimates the time for which drainage at the drainage point will continue.

[0051] For example, if the quality of water supplied to a customer falls below a certain standard, the water must be disposed of without being supplied to the customer. To do this, the water supply to the customer must be actively drained, but the administrator may determine the appropriate duration of drainage based on experience. In such a situation, for example, after the water below the standard has been disposed of, it is desirable to quickly stop draining the water.

[0052] According to the drainage time estimation process, an appropriate drainage time can be estimated, preventing waste of water resources while safely supplying tap water.

[0053] The drainage time estimation process starts when the browser processing unit 121 of the administrator terminal 100 receives a start instruction from the administrator.

[0054] First, the residual chlorine concentration reduction model estimation unit 224 of the residual chlorine management device 200 identifies the water distribution block inlet P0 point, the drainage point P1, and the distance L (step S01). Specifically, the browser processing unit 121 receives inputs of the water distribution block inlet P0 point and the drainage point P1 from the administrator and transmits them to the residual chlorine management device 200. The residual chlorine concentration reduction model estimation unit 224 identifies the distance L between the water distribution block inlet P0 point and the drainage point P1 by referring to map information or the distance information of the flow path.

[0055] Then, the residual chlorine concentration reduction model estimation unit 224 estimates the residual chlorine concentration reduction model (residual chlorine concentration reduction coefficient k) at the drainage point P1 (step S02). Details of the process for estimating the residual chlorine concentration reduction model (residual chlorine concentration reduction coefficient k) will be described later.

[0056] Then, the arrival time model estimation unit 221 uses the tap water of the water supply, with the flow velocity before drainage start as v1, the flow velocity after drainage start as v´1 (v1 < v´1), and a point P at a distance x in the direction from P0 to P1 at the drainage start time. x (x < L) for the water W x and as W x estimates, using the above formula (1), the calculation formula for the time t required for W to reach from P0 to P1 as a residual chlorine concentration reduction model (step S03).

[0057] Then, the residual chlorine concentration reduction model estimation unit 224 estimates the calculation formula for the residual chlorine concentration after the elapse of the arrival time t using the estimated residual chlorine concentration reduction model (step S04). Specifically, the residual chlorine concentration reduction model estimation unit 224 uses the above formula (2) as the calculation formula for the residual chlorine concentration.

[0058] Then, the limit concentration point specifying unit 222 calculates the point where the limit concentration C is reached after the required time t has elapsed, and x (Step S05). That is, the limit concentration point identifying unit 222 identifies, as a limit concentration point, a position on the water supply where tap water is expected to reach the discharge point while maintaining a predetermined residual chlorine concentration after the required time has elapsed. In the process of identifying the limit concentration point, the limit concentration point identifying unit 222 determines the required time t for reaching the limit concentration C, and calculates x using the flow rate v'1 after discharge starts. For example, the limit concentration point identifying unit 222 applies the estimated residual salt concentration reduction coefficient k, the limit concentration C, and the initial residual salt concentration C0 to the above formula (2) to determine the required time t for reaching the limit concentration C. Then, the limit concentration point identifying unit 222 applies the flow rate v1 at the start of discharge and the flow rate v'1 after water distribution starts to the above formula (1) to calculate x.

[0059] Then, the drainage time estimation unit 223 estimates the drainage time E (step S06). Specifically, the drainage time estimation unit 223 divides the travel distance of the tap water from the critical concentration point until it reaches the drainage point by the flow velocity v'1 after the start of drainage, and estimates this as the drainage time E at the drainage point.

[0060] The above is an example of the drainage time estimation process. According to the drainage time estimation process, a reasonable drainage time can be automatically estimated by an instruction from the administrator, and therefore the drainage time can be easily and reasonably controlled.

[0061] 5 is a diagram showing an example of a change in flow rate after drainage begins. In graph 600, the horizontal axis represents time and the vertical axis represents flow rate. This graph shows an example in which tap water flows at a flow rate of v1 before drainage begins, but after drainage begins, the flow rate increases to v'1.

[0062] 6 is a diagram showing an example of the required arrival time before and after the start of drainage. In graph 700, the horizontal axis represents the position of the water particles when drainage starts, and the vertical axis represents the total time it takes for the water particles to move from P0 to P1. This shows an example in which tap water that was at P0 when drainage started will travel a distance L at a speed of v'1, and tap water that was at a position x that was closer to P1 than P0 when drainage started will have already traveled a distance x at a speed of v1 and will travel a distance of (Lx) at a speed of v'1.

[0063] 7 is a diagram showing an example of a residual chlorine concentration graph. In graph 800, the horizontal axis represents the arrival time, and the vertical axis represents the residual chlorine concentration. This shows an example in which the residual chlorine concentration decreases as the arrival time increases.

[0064] FIG. 8 is a diagram showing an example of a setting screen for the drainage time estimation process. Screen 900 is displayed on administrator terminal 100. Screen 900 includes a water distribution block entrance P0 designation area 910, a drainage point P1 designation area 920, a "Specify from map" button 930 for designating a point on a map, and a "Drainage time estimation" button 940 for starting drainage time estimation. The water distribution block entrance P0 designation area 910 and the drainage point P1 designation area 920 accept selection input of the respective points. The "Specify from map" button 930 accepts the water distribution block entrance P0 and the drainage point P1 designation area 920 by designating a point on a map (which may be a piping route diagram). Upon accepting input, the "Drainage time estimation" button 940 starts the drainage time estimation process.

[0065] 9 is a diagram showing an example of the residual salt concentration reduction model estimation process, which starts in step S02 of the drainage time estimation process.

[0066] First, the residual salt concentration reduction model estimation unit 224 calculates the arrival time t from P0 to the discharge point P1 and the initial residual salt concentration C _0 and the residual salt concentration C at the destination point after the arrival time t has elapsed from P0. _tand calculates the residual salt concentration reduction coefficient k at a plurality of time points (step S10). Specifically, the residual salt concentration reduction model estimation unit 224 calculates k using the following formula (3).

[0067]

number

[0068] Then, the residual salt concentration reduction model estimation unit 224 learns data from multiple time points using the residual salt concentration reduction coefficient k as the objective variable and values of predetermined characteristics of the tap water upstream of P0 (predetermined characteristics including any one or a combination of the past water temperature, time of day, season, turbidity, pH, and electrical conductivity of the water purification plant) as explanatory variables (step S11). Alternatively, the residual salt concentration reduction model estimation unit 224 may perform deep learning using measurement data including the predetermined characteristics of the tap water upstream of P0.

[0069] Then, the residual salt concentration reduction model estimation unit 224 estimates the residual salt concentration reduction coefficient k using the most recent explanatory variables as parameters (step S12). Specifically, the residual salt concentration reduction model estimation unit 224 reads out values of predetermined characteristics of tap water (predetermined characteristics including any one or a combination of the past water temperature, time of day, season, turbidity, pH, and electrical conductivity at the water purification plant) of the most recent or a predetermined period (as close as possible to the time of treatment) from the water quality data 211 and the flow velocity data 212, and estimates the residual salt concentration reduction coefficient k to be used for drainage time estimation.

[0070] The above is an example of the residual salt concentration reduction model estimation process. According to the residual salt concentration reduction model estimation process, the residual salt concentration reduction coefficient k used to estimate the drainage time can be estimated using past performance data. Then, by applying the residual salt concentration reduction coefficient k, the required time t to reach the drainage point, and the limit concentration C at the drainage point to the above equation (1), it is also possible to estimate the amount of chlorine to be injected at point P0 to prevent the concentration at the drainage point from falling below the limit concentration.

[0071] Although the present invention has been described above with reference to an embodiment, it is not limited to the above-described embodiment and includes various modifications. For example, in the above embodiment, the residual salt concentration reduction coefficient k is estimated using a wide range of past data. However, this is not limiting. For more accurate estimation, the residual salt concentration reduction coefficient k may be estimated based on past performance values limited to the same season, month, date, etc. Alternatively, even if sufficient past performance data cannot be obtained, performance data from other regions with similar piping structures may be used for estimation. This allows the system to be safely started after installation.

[0072] The above-described exemplary embodiments have been described in detail to facilitate understanding of the present invention, and the present invention is not limited to those including all of the components described herein. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment with other configurations. Furthermore, some or all of the above-described configurations, functions, processing units, processing means, etc. may be realized in hardware, for example, by designing them as integrated circuits. Furthermore, the control lines and information lines in the figures are those considered necessary for explanation, and are not necessarily all shown. It is also possible to consider that almost all of the components are interconnected. [Explanation of symbols]

[0073] 1... residual chlorine management system, 50... network, 100... administrator terminal, 120... processing unit, 121... browser processing unit, 130... display unit, 131... input unit, 140... communication unit, 200... residual chlorine management device, 220... processing unit, 221... arrival time required model estimation unit, 222... limit concentration point identification unit, 22 3···Drainage time estimation unit, 224···Residual salt concentration reduction model estimation unit, 240···Communication unit, 300···Water quality detection device, 320···Processing unit, 321···Water quality reporting unit, 330···Water quality detection unit, 340···Communication unit, 400···Flow rate detection device, 420···Processing unit, 421···Flow rate reporting unit, 430···Flow rate detection unit, 440···Communication unit.

Claims

1. a time-required arrival model estimation unit that estimates a model specifying the time required for tap water from an arbitrary point on the waterworks to reach a drainage point using the flow rate of tap water after drainage starts and the flow rate of tap water before drainage starts in a predetermined waterworks route; a limit concentration point identifying unit that identifies, as a limit concentration point, a position of tap water on the waterworks that is expected to reach the discharge point while maintaining a predetermined residual chlorine concentration after the required arrival time has elapsed; a drainage time estimation unit that uses the model to identify the time required for the tap water at the critical concentration point to reach the drainage point and estimates it as a time for which drainage at the drainage point should continue; A residual chlorine control device comprising:

2. The residual chlorine control device according to claim 1, the travel time model estimation unit uses a distance from the arbitrary point to the drainage point in the process of estimating the model; A residual chlorine control device characterized by:

3. The residual chlorine control device according to claim 1 or 2, the limit concentration point specifying unit estimates the residual chlorine concentration in accordance with the required time to reach the limit concentration point in the process of specifying the limit concentration point. A residual chlorine control device characterized by the above.

4. The residual chlorine control device according to claim 3, In the process of estimating the residual chlorine concentration, a residual chlorine concentration reduction model estimation unit is provided which estimates a residual chlorine concentration reduction model which indicates a change in the residual chlorine concentration over time, the limit concentration point specifying unit estimates the residual chlorine concentration using the residual salt concentration reduction model; A residual chlorine control device characterized by the above.

5. The residual chlorine control device according to claim 4, The residual salt concentration reduction model estimation unit estimates a residual salt concentration reduction coefficient used in a trained model trained using actual values of the residual chlorine concentration in the water supply route, using a predetermined feature value of tap water upstream of the water supply route. A residual chlorine control device characterized by:

6. A residual chlorine control method using a residual chlorine control device, The residual chlorine control device is a required arrival time model estimation step of estimating a model that specifies the required arrival time for tap water from an arbitrary point on the water supply to reach a drainage point using the flow rate of tap water after drainage starts and the flow rate of tap water before drainage starts in a predetermined water supply route; a limit concentration point identifying step of identifying, as a limit concentration point, a position of tap water on the water supply that is expected to reach the discharge point while maintaining a predetermined residual chlorine concentration after the required arrival time has elapsed; a drainage time estimation step of specifying the time required for the tap water at the critical concentration point to reach the drainage point using the model and estimating it as a time for which drainage at the drainage point will continue; A residual chlorine control method characterized by carrying out the following.

7. A residual chlorine management system using a residual chlorine management device, The residual chlorine control device is a required arrival time model estimation step of estimating a model that specifies the required arrival time for tap water from an arbitrary point on the water supply to reach a drainage point using the flow rate of tap water after drainage starts and the flow rate of tap water before drainage starts in a predetermined water supply route; a limit concentration point identifying step of identifying, as a limit concentration point, a position of tap water on the water supply that is expected to reach the discharge point while maintaining a predetermined residual chlorine concentration after the required arrival time has elapsed; a drainage time estimation step of specifying the time required for the tap water at the critical concentration point to reach the drainage point using the model and estimating it as a time for which drainage at the drainage point will continue; A residual chlorine management system characterized by carrying out the above.

8. A residual chlorine management program that causes an information processing device to manage residual chlorine, a processing unit of the information processing device; a required arrival time model estimation step of estimating a model that specifies the required arrival time for tap water from an arbitrary point on the water supply to reach a drainage point using the flow rate of tap water after drainage starts and the flow rate of tap water before drainage starts in a predetermined water supply route; a limit concentration point identifying step of identifying, as a limit concentration point, a position of tap water on the water supply that is expected to reach the discharge point while maintaining a predetermined residual chlorine concentration after the required arrival time has elapsed; a drainage time estimation step of specifying the time required for the tap water at the critical concentration point to reach the drainage point using the model and estimating it as a time for which drainage at the drainage point will continue; A residual chlorine management program characterized by carrying out the above steps.

Images