JP6461706B2 - Water supply apparatus and water supply control method - Google Patents

Description

  Embodiments of the present invention relate to a water supply apparatus and a water supply control method for supplying water while monitoring the quality of water after removing pollutants.

  Conventionally, when raw water after water intake is processed and supplied as required water, various pollutants contained in the raw water are removed by a water treatment device, etc. It is measured in detail. Then, based on the comparison between the measurement result and the allowable amount, it is determined whether or not the water quality is as expected, and the continuation or stop of the water supply is switched.

  In general, for the treated water output from the water treatment device or the like, the allowable residual amount of the specific substance or the like is much smaller. For this reason, in the measurement, for example, a monitor device or the like having higher sensitivity than the measurement performed on the intake side is used, and the time required for the measurement becomes longer. As an example, in the radioactivity measurement procedure for tap water intended for drinking, as an example using a NaI (sodium iodide) detector, a measurement time of several minutes to several tens of minutes for a detection sensitivity of several tens of becquerels per liter is used. (See Non-Patent Document 1).

JP 2003-305454 A

Ministry of Health, Labor and Welfare Health Bureau Water Section “Radioactivity Measurement Manual for Tap Water” Table 4-5 Relationship between Detection Sensitivity and Measurement Time October 2011

  By the way, when supplying water to downstream equipment while monitoring the residual amount of trace amount of specific substances that become pollutants for the water that is continuously output after treatment by the water treatment device, measure this residual amount. Since this is performed with extremely high sensitivity, a certain amount of measurement time is required. However, when this measurement time becomes a time that cannot be ignored as described above, for example, the water supply continues to the downstream equipment during the measurement time, so the measurement of the residual amount is completed and the monitor value At the time of obtaining the water, there is a risk that the water that deviates from the allowable value of the residual amount may be supplied to the downstream equipment or the like.

  This will be described with reference to FIG. FIG. 4 shows a temporal change, a monitored value thereof, and a continuation / stop control of water supply performed based on the monitored value, with the residual amount of the specific substance in the treated water treated by the water treatment device as the contaminated amount. Is a modeled example. Although the amount of contamination in the water treated by the water treatment apparatus is very small, it is considered that it changes even after treatment as illustrated by the solid line in the figure. In order to measure this amount of contamination with high sensitivity, a predetermined measurement time is required. Therefore, the monitor value as the measurement result is acquired with a delay corresponding to the measurement time as illustrated by the broken line in the figure. The And the continuation or stop of water supply is controlled based on this monitoring result.

  At this time, if there is an allowable value for the amount of contamination in the middle of the change range of the amount of contamination of treated water, especially in a scene where the amount of contamination increases, it is affected by the delay of the measurement time. There was a risk that water that exceeded the permissible amount of contamination would be supplied downstream. Also, even during the time zone immediately after the operation of the water treatment device, until the first monitor value is acquired, the monitor value of the contamination amount is not fixed, and there is a risk that water exceeding the allowable contamination amount will be supplied. was there.

  In order to avoid such an event, for example, a method of delaying water supply by adding a water supply pipe for time adjustment corresponding to the measurement time can be considered. Further, when the flow rate is changed, it is inevitable that it becomes more complicated.

  The embodiment of the present invention has been made in consideration of the above-mentioned circumstances, and the residual amount of a specific substance that becomes a pollutant in the treated water output from the water treatment apparatus is closely monitored. However, even when it takes time to measure the residual amount when supplying water to the subsequent equipment, the supply of water for which the residual amount of the specified substance deviates from the allowable range is suppressed without increasing the scale of the entire device. An object of the present invention is to provide a water supply device that supplies only water within an allowable range, and a water supply control method.

  In order to achieve the above object, the water supply device of the present embodiment is a water supply device that supplies water while monitoring the residual amount of the raw water from which specific substances in the raw water have been removed by the water treatment device. A water treatment device that removes specific substances contained in the water and supplies water, and is connected to the outlet side of the water treatment device by a pipe line to supply or stop the water after treatment by the water treatment device. A first water quality which is provided in the middle of a pipeline connecting the water supply / drainage switching device and the water treatment device and the water supply / drainage switching device and measures the amount of a specific substance remaining in the water treated by the water treatment device. The measurement results of the monitor, the second water quality monitor that is provided on the inlet side of the water treatment device and measures the amount of the specific substance contained in the raw water, the first water quality monitor, and the second monitor Based on said water supply / drainage changer A water supply control unit that controls the start or stop of water supply, and the water supply control unit includes a residence time of treated water required for water treatment in the water treatment device and a measurement by the second water quality monitor. Based on the measurement time required for the processing, the delay time until the raw water reaches the water supply / drainage switching device as treated water is predicted, and the processing reaching the water supply / drainage switching device based on the prediction result A predicted measurement result, which is a measurement result when the subsequent water is measured with the second water quality monitor as the raw water, is less than a preset second threshold value, and is processed by the water treatment device. Water supply is started when the measurement result by the first water quality monitor for the subsequent water is less than a preset first threshold value, and the predicted measurement result is greater than or equal to the second threshold value. In case To stop the water, and controlling the supply and drain switcher.

  In addition, the water supply control method of the present embodiment monitors the residual amount of the water from which specific substances in the raw water have been removed by the water treatment device, and performs water supply control in the water supply device that supplies water while switching the water supply / drainage with the water supply / drainage switch In the method, the water supply device is provided with a residence time of treated water required for water treatment in the water treatment device and an amount of a specific substance contained in the raw water on an inlet side of the water treatment device. 2 is used to predict a delay time until the raw water reaches the water supply / drainage switching device as treated water based on the measurement time required for measurement by the water quality monitor 2 and based on the prediction result, the water supply / drainage The predicted measurement result, which is the measurement result when the treated water reaching the switching device is measured by the second water quality monitor as the raw water, is less than a preset second threshold value. In addition, the residual amount of the specific substance in the water treated by the water treatment device is measured by a first water quality monitor provided on the outlet side of the water treatment device, and the measurement result is set in advance. Water supply is started when it is less than the first threshold value, and water supply is stopped when the predicted measurement result is greater than or equal to the second threshold value.

The block diagram which shows an example of a structure of the water supply apparatus which concerns on this embodiment. Explanatory drawing for modeling and explaining an example of water supply control concerning this embodiment. The flowchart for demonstrating operation | movement of the water supply apparatus illustrated in FIG. The figure which models and shows an example of the conventional water supply control.

  Below, the best form for implementing the water supply apparatus and water supply control method which concern on embodiment of this invention is demonstrated with reference to FIGS. 1-3.

  FIG. 1 is a block diagram illustrating an example of a configuration of a water supply apparatus according to the present embodiment. As illustrated in FIG. 1, the water supply device 1 includes a water treatment device 10, a water supply / drainage switch 20, a water quality monitor (# 1) 30, a water quality monitor (# 2) 40, a flow meter 50, and a water supply control unit 60. It is configured.

  The water treatment apparatus 10 removes various specific substances contained in the input raw water, for example, which become pollutants, and outputs them as irrigation water meeting the required purpose after the treatment. The water supply / drainage switcher 20 is connected to the outlet side of the water treatment apparatus 10 via a pipe line 70a, and supplies the water treated by the water treatment apparatus 10 to the subsequent equipment or the like by control from the water supply control unit 60 described later. Or to stop water supply. In addition, water supply is assumed to be drained when water supply to downstream equipment is stopped.

  The water quality monitor (# 1) 30 is provided in the middle of the pipe 70 a, measures the amount of the specific substance remaining in the treated water by the water treatment device 10, and outputs the measurement result to the water supply control unit 60. To do. Since this measurement is performed with high sensitivity, the time required for the measurement (hereinafter referred to as measurement time (# 1)) is relatively long. The water quality monitor (# 2) 40 is provided in the middle of the pipeline 70b for introducing the raw water into the water treatment apparatus 10, measures the amount of a specific substance contained in the raw water, and supplies the measurement result to the water supply. Output to the controller 60. Since the measurement of the water quality monitor (# 2) 40 is generally performed with lower sensitivity than the water quality monitor (# 1) 30, the time required for measurement (hereinafter referred to as measurement time (# 2)) is measured. The time is shorter than the time (# 1), and (measurement time (# 2)) ≦ (measurement time (# 1)). The flow meter 50 is also provided in the middle of the pipe 70 b for introducing the raw water into the water treatment device 10, and measures the flow rate of the raw water flowing into the water treatment device 10 and notifies the water supply control unit 60.

  The water supply control unit 60 controls the water supply / drainage switch 20 to start or stop water supply based on the measurement results of the water quality monitor (# 1) 30 and the water quality monitor (# 2) 40. Is generated and sent to the water supply / drainage switcher 20. In the present embodiment, the conditions for starting and stopping water supply are set as follows. That is, the condition for starting water supply is that the delay time until raw water is processed by the water treatment device 10 and reaches the water supply / drainage switcher 20 is predicted, and based on the prediction result, the water supply / drainage switcher 20 is reached. The measurement result when the treated water is measured as raw water by the water quality monitor (# 2) 40 is derived as a predicted measurement result, and the predicted measurement result is a reference value (a threshold value set in advance). # 2) and the measurement result of the treated water by the water quality monitor (# 1) 30 is less than a reference value (# 1) which is a preset threshold value. Further, the residence time of the treated water in the water treatment apparatus 10 required when predicting the delay time can be set as a fixed value, but in this embodiment, the measurement result of the flow meter 50 is used. It is calculated based on

  On the other hand, the condition for stopping the water supply is that the above-described predicted measurement result is equal to or greater than the reference value (# 2). The reference value (# 1) is a reference value for determining whether or not water supply is permitted with respect to the measurement result of the amount of contaminated treated water, and the reference value (# 2) is the raw water This is a reference value for determining whether or not water supply is allowed for the predicted measurement result of the amount of contamination, and water supply is allowed at less than the reference value. The control of the start and stop of these water supplies will be described in more detail with reference to FIG.

  FIG. 2 shows the amount of specific substances contained in the raw water and treated water as the amount of contamination, the time variation of each amount of contamination, the predicted measurement result of the water quality monitor (# 2) 40, and the water quality monitor (# 1) It is explanatory drawing which modeled the relationship between the measurement result in 30, and the start / stop control of water supply.

  When the amount of contamination of the raw water changes as indicated by a solid line (A) in FIG. 2, this raw water is a water quality monitor (# 2) that requires measurement time (# 2) on the inlet side of the water treatment device 10. The amount of contamination is measured by 40, and after being treated by the water treatment apparatus 10 after a predetermined residence time, it reaches the water supply / drainage switching device via the pipeline 70a as treated water. As shown in the broken line (B) in FIG. 2, the predicted measurement result for the arriving water, that is, the measurement result of the amount of contamination measured when passing through the water quality monitor (# 2) 40 as raw water, With respect to the flow of raw water, it can be predicted that the data is acquired with a delay of ((residence time required for water treatment in the water treatment device 10) −measurement time (# 2)). However, the delay time by the pipe line 70a is negligible compared to other elements. On the other hand, when the amount of contamination remaining for the treated water has changed as indicated by the solid line (C) in FIG. 2, the measurement result by the water quality monitor (# 1) 30 for the treated water is: As illustrated in the broken line (D) in FIG. 2, it is acquired with a delay time of the measurement time (# 1) with respect to the treated water flow.

  In this way, the water supply control unit 60 receives the measurement result of the water quality monitor (# 2) 40, and the measured raw water is treated after being treated based on the residence time of the water treatment device 10 and the measurement time (# 2). The time difference for reaching the water supply / drainage switching device 20 as water is predicted, and the predicted measurement result is derived. Moreover, about the residence time of the water treatment apparatus 10 used in the case of prediction, it shall be fluctuate | varied with the quantity of the raw | natural water which flows in, and in this Example, the inflow quantity of raw | natural water is measured with the flowmeter 50, and the measurement result is shown. Reflecting, the residence time of the water treatment apparatus 10 is calculated.

  At the same time, the measurement result of the water quality monitor (# 1) 30 is received and compared with the reference value (# 1). As a result of the comparison, the predicted measurement result is lower than the reference value (# 2) (for example, point X in FIG. 2), and the measurement result of the water quality monitor (# 1) 30 is lower than the reference value (# 1). When it is lower (for example, the Y point in FIG. 2), a control signal for starting water supply is generated and sent to the water supply / drainage switcher 20. That is, since the water supply start is determined based on the measurement result of the water quality monitor (# 1) 30 and the predicted measurement result of the water quality monitor (# 2) 40, the water supply is performed in a state where the allowable value of the contamination amount is exceeded. Will never start. Moreover, by introducing the predicted measurement result into the determination, particularly when the measurement result of the water quality monitor (# 1) 30 is confirmed immediately after the operation of the device, the value is below the reference value (# 1), The amount of contamination remaining in the treated water after the treatment tends to increase, and there is an effect of suppressing the supply of water that exceeds the reference value (# 1).

  On the other hand, when it is detected that the derived predicted measurement result is equal to or greater than the reference value (# 2) (for example, point Z in FIG. 2), the water supply control unit 60 generates a control signal for stopping the water supply. , And sent to the water supply / drainage switcher 20. As a result, the water supply is stopped without waiting for the measurement result of the water quality monitor (# 1) 30, so that the timing of the water supply stop is not delayed particularly when the amount of contamination tends to increase.

  Next, operations of the water supply apparatus and the water supply control method of the present embodiment configured as described above will be described with reference to the above-described flowcharts of FIGS. 1 and 2 and FIG. 3. FIG. 3 is a flowchart for explaining the operation of the water supply apparatus 1 illustrated in FIG. 1.

  When raw water begins to flow into the water treatment apparatus 10 via the pipe line 70b, first, the flow rate of the raw water flowing in is measured by the flow meter 50 provided in the middle of the pipe line 70b, and the result is the water supply control unit. 60 is notified. Based on this result, the water supply control unit 60 calculates the residence time of the treated water in the downstream water treatment apparatus 10 (ST301). Similarly, the water quality monitor (# 2) 40 provided in the middle of the pipeline 70b measures the amount of the specific substance contained in the raw water as the amount of contamination, and notifies the water supply control unit 60 of the measurement result ( ST302).

  Next, in the water supply control unit 60, a predicted measurement result is calculated. That is, the water supply control unit 60 uses the treated water retention time in the water treatment apparatus 10 calculated from the measurement result of the flow meter 50 and the measurement time (# 2), and the raw water becomes treated water. The time required to reach the water supply / drainage switcher 20 is predicted, and the treated water that has reached the water supply / drainage switcher 20 is measured as raw water by the water quality monitor (# 2) 40. Calculate the measurement results. The predicted measurement result is represented, for example, by a broken line (B) in FIG. 2 (ST303). While these measurements are being made, raw water continues to flow into the water treatment device 10 via the pipeline 70b, and water treatment is performed on the raw water over a predetermined residence time. Then, the treated water is sent to the water supply / drainage switching device 20 via the pipeline 70a (ST304).

  Next, the amount of contamination remaining in the treated water is measured by a water quality monitor (# 1) provided in the middle of the pipeline 70a. Since this measurement is performed with high sensitivity, for example, as in the case of the solid line (C) and the broken line (D) in FIG. 2, the measurement is performed with a relatively long measurement time (# 1), and the measurement result Is notified to the water supply control unit 60 (ST305).

  Next, it is determined whether to continue or stop the water supply to the subsequent equipment, and the water supply / drainage switcher 20 is controlled based on the determination result. That is, the water supply control unit 60 first compares the predicted measurement result with the reference value (# 2) (ST306), and if the predicted measurement result is less than the reference value (Y in ST306), the water quality monitor (# 1). The measurement result of 30 and the reference value (# 1) are compared (ST307), and if the measurement result is less than the reference value (Y of ST307), it is determined that the water supply is started continuously. Then, a control signal for starting water supply is generated and sent to the water supply / drainage switcher 20. If this determination corresponds to FIG. 2, for example, the determination in ST306 corresponds to the X point in FIG. 2, and the determination in ST307 corresponds to the Y point in FIG. 2 (ST308).

  On the other hand, if the predicted measurement result is equal to or greater than the reference value as a result of the comparison between the predicted measurement result and the reference value (# 2) (N in ST306), the water supply control unit 60 determines to stop the water supply, and stops the water supply. A control signal is generated and sent to the water supply / drainage switcher 20. Further, when the measurement result of the water quality monitor (# 1) 30 is equal to or higher than the reference value (N in ST307), the water supply is similarly stopped (ST309). In this way, the above-described operation steps are repeated until the end of the operation is instructed while controlling the water supply to the subsequent equipment (ST310).

  As described above, in the present embodiment, the residual amount of the specific substance is measured with high sensitivity by the water quality monitor (# 1) 30 with respect to the water just before the water supply that has been processed by the water treatment device 10. , Getting measurement results. Further, from the measurement result when the water just before water supply is measured by the water quality monitor (# 2) 40 as raw water, the raw water reaches the water supply / drainage switcher 20 as the treated water after being input to the water treatment device 10. Predictive measurement results are calculated based on the prediction of the delay time until completion. Then, when both the measurement result of the water quality monitor (# 1) 30 and the predicted measurement result reflecting the measurement result of the water quality monitor (# 2) 40 are below a preset reference value, water supply is performed. At the same time, the water supply is stopped when the predicted measurement result exceeds the reference value.

  As a result, even if it takes time to measure the residual amount of a specific substance that becomes a pollutant for treated water output from the water treatment device, it can be specified without increasing the scale of the entire device. It is possible to supply only water for which the residual amount of the substance is within an allowable range. In particular, immediately after the start of operation of the device, when the amount of the specified substance is on the increase, water with the remaining amount of the specified substance exceeding the reference value is supplied to the subsequent equipment according to the judgment that introduced the predicted measurement result. Event can be suppressed.

  Although several embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Water supply apparatus 10 Water treatment apparatus 20 Supply / drainage switching device 30 Water quality monitor (# 1)
40 Water quality monitor (# 2)
50 Flow meter 60 Water supply control unit

Claims (4)

A water supply device that supplies water while monitoring the residual amount of the raw water from which specific substances in the raw water have been removed by the water treatment device,
A water treatment device that removes specific substances contained in raw water and sends the water;
A water supply / drainage switch connected to the outlet side of the water treatment device by a pipe, and for switching whether to supply the water after treatment in the water treatment device to the subsequent stage, or to stop,
A first water quality monitor that is provided in the middle of a pipe connecting the water treatment device and the water supply / drainage switch, and that measures the amount of a specific substance remaining in the water treated by the water treatment device;
A second water quality monitor that is provided on the inlet side of the water treatment device and measures the amount of a specific substance contained in the raw water;
A water supply control unit for controlling start or stop of water supply to the water supply / drainage switch based on the measurement results of the first water quality monitor and the second monitor;
The water supply control unit
Based on the residence time of treated water required for water treatment in the water treatment device and the measurement time required for measurement by the second water quality monitor, the raw water reaches the water supply / drainage switch as treated water. While predicting the delay time until
Based on this prediction result, the treated water reaching the water supply / drainage switcher is derived as a measurement result when the second water quality monitor is measured as the raw water, and the prediction measurement result is obtained. Is less than a preset second threshold, and
When the measurement result by the first water quality monitor for the treated water after treatment by the water treatment device is less than a preset first threshold value, water supply is started,
The water supply apparatus characterized by controlling the said water supply / drainage switch so that water supply may be stopped when the said prediction measurement result is more than the said 2nd threshold value. Furthermore, a flow meter for measuring the flow rate of the raw water is provided on the inlet side of the water treatment device,
The said water supply control part calculates the residence time in the said water treatment apparatus based on the measurement result of this flowmeter, The water supply apparatus of Claim 1 characterized by the above-mentioned. A water supply control method in a water supply device that monitors the residual amount of water from which specific substances in raw water have been removed by a water treatment device and supplies water while switching between water supply and drainage with a water supply / drainage switch,
The water supply device is
It is necessary to measure the residence time of treated water required for water treatment in the water treatment device and the amount of the specific substance contained in the raw water with a second water quality monitor provided on the inlet side of the water treatment device. Based on the measurement time and predicting the delay time until the raw water reaches the water supply / drainage switch as treated water,
Based on this prediction result, the measurement result when the treated water reaching the water supply / drainage switching device is measured as the raw water by the second water quality monitor is derived as the prediction measurement result, and the prediction measurement result is , it is less than a second threshold set in advance, and,
The residual amount of the specific substance in the water treated by the water treatment device is measured by a first water quality monitor provided on the outlet side of the water treatment device, and the measurement result is set in a first step. Start water supply if the threshold is below
A water supply control method, wherein water supply is stopped when the predicted measurement result is equal to or greater than the second threshold value.   The said water supply apparatus calculates the residence time of the said water treatment apparatus based on the measurement result of the flowmeter which measures the flow volume of the said raw | natural water provided in the inlet side of this water treatment apparatus. The water supply control method described in 1.