Water treatment management equipment and water treatment management method

Abstract

To provide a water treatment management device and a water treatment management method that can accurately determine the status of chemical injection while increasing the frequency of such determinations. [Solution] The system comprises a chemical tank 10, a chemical remaining amount detection unit 60, an input amount calculation unit 22, and a chemical injection status determination unit 24. The input amount calculation unit 22 calculates the input amount for each calculation period, and the chemical injection status determination unit 24 determines the quality of the chemical injection status by comparing the cumulative input amount, which is the sum of the input amounts during the target period, with the change in the amount of chemical remaining during the target period. Part of the target period for the current determination can overlap with part of the target period for the previous determination.

Description

Technical Field

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[0001] The present invention relates to a water treatment management device and a water treatment management method.

Background Art

[0002] There is a technique for determining whether the chemical injection status is appropriate based on the comparison result between the amount of chemical solution that would be discharged from a chemical solution tank by a chemical injection pump and the decrease amount of the chemical solution in the chemical solution tank. For example, Patent Document 1 discloses a technique for comparing, at regular intervals, the decrease amount of the chemical solution in the chemical solution tank obtained from the amount of the chemical solution in the chemical solution tank with the estimated decrease amount of the chemical solution obtained from the input amount of the chemical solution.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when detecting the decrease amount of the chemical solution in the chemical solution tank with a chemical solution remaining amount detection means such as a chemical solution level sensor, when the decrease amount is small, the decrease amount may not be accurately detected. This is because the detection result of the chemical solution remaining amount detection means may include an error. Therefore, in order to accurately determine the chemical injection status, it is preferable to determine the chemical injection status after the chemical injection amount becomes sufficiently large.

[0005] However, when determining the chemical injection status after the chemical injection amount becomes sufficiently large, the interval for determining the chemical injection status may become wide. In that case, it becomes difficult to respond to abnormalities promptly.

[0006] Therefore, an object of the present invention is to provide a water treatment management device and a water treatment management method that can increase the frequency of determining the chemical injection status while accurately determining the chemical injection status.

Means for Solving the Problems

[0007] The water treatment management device of the present invention comprises a chemical tank for storing chemical solution, a chemical solution remaining amount detection unit for detecting the remaining amount of chemical solution in the chemical tank, an input amount calculation unit for calculating the amount of chemical solution that would have been injected from the chemical tank, and a chemical injection status determination unit for determining whether the chemical injection status is good or bad. The input amount calculation unit calculates the input amount for each calculation period, and the chemical injection status determination unit determines whether the chemical injection status is good or bad by comparing the cumulative input amount, which is the sum of the input amounts over a target period consisting of one or more calculation periods up to the time of determination, with the change in the remaining amount of chemical solution during the target period. The chemical injection status determination unit repeatedly makes the determination over time, and when consecutive determinations are referred to as the previous determination and the next determination, a portion of the target period in the current determination can overlap with a portion of the target period in the previous determination.

[0008] The water treatment management method of the present invention comprises a calculation step of calculating the amount of chemical solution to be injected for each calculation period, and a judgment step of determining whether the chemical injection situation is good or bad by comparing the cumulative amount of the injected amount obtained by accumulating the amount of the injected amount during a target period consisting of one or more calculation periods up to the judgment with the amount of change in the remaining amount of chemical solution during the target period, wherein the judgment step is repeated over time, and if consecutive judgment steps are considered as the previous judgment step and the current judgment step, a part of the target period of the current judgment can overlap with a part of the target period of the previous judgment. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a water treatment management device and a water treatment management method that can accurately determine the status of chemical injection while increasing the frequency of determining the status of chemical injection. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows an overview of the water treatment management device of Embodiment 1 of the present invention. [Figure 2] Figure 2 shows the remaining amount of drug solution and the amount of drug added over a predetermined period for Embodiment 1. [Figure 3] Figure 3 shows the remaining amount of drug solution and the amount of drug added over a predetermined period for Embodiment 2. [Figure 4] Figure 4 shows the remaining amount of drug solution and the amount of drug added over a predetermined period for Embodiment 3. [Figure 5A] Figure 5A is a flowchart showing the flow of ratio calculation in the water treatment management method according to an embodiment of the present invention. [Figure 5B] Figure 5B is a flowchart following Figure 5A, showing the flow of ratio calculation in the water treatment management method according to an embodiment of the present invention. [Modes for carrying out the invention]

[0011] (Embodiment 1) The water treatment management device 1 and water treatment management method of Embodiment 1 of the present invention will be described with reference to the drawings. Figure 1 is a diagram showing an overview of the water treatment management device 1 of Embodiment 1.

[0012] (Water treatment management system) As shown in Figure 1, the water treatment management device 1 includes a chemical tank 10, a chemical injection control unit 20, a chemical injection line 50, a chemical injection pump 52, and a chemical remaining amount detection unit 60.

[0013] The chemical solution tank 10 is a tank for storing the chemical solution 2 used for chemical injection. The chemical solution remaining amount detection unit 60 is a part that detects the remaining amount of chemical solution 2 stored in the chemical solution tank 10. The chemical solution remaining amount detection unit 60 functions as a chemical solution remaining amount detection means. The chemical solution remaining amount detection unit 60 is provided in the chemical solution tank 10. The chemical solution remaining amount detection unit 60 can be, for example, a chemical solution level sensor. The configuration of the chemical solution remaining amount detection unit 60 is not particularly limited and can be, for example, a weighing scale.

[0014] The chemical injection line 50 is a line for injecting the chemical solution 2 from the chemical solution tank 10. One end of the chemical injection line 50 is connected to the chemical solution tank 10. The chemical injection pump 52 is a pump for dispensing the chemical solution 2 from the chemical solution tank 10. The chemical injection pump 52 is installed in the chemical injection line 50.

[0015] The drug injection control unit 20 is a part that controls drug injection. The result detected by the chemical liquid remaining amount detection unit 60 is input to the drug injection control unit 20. The drug injection control unit 20 sends a pump control signal 54 for controlling the operation of the drug injection pump 52 to the drug injection pump 52.

[0016] The drug injection control unit 20 includes an input amount calculation unit 22, a drug injection status determination unit 24, a replenishment presence / absence detection unit 26, a defect detection unit 28, a power-off detection unit 30, and a storage unit 32. The input amount calculation unit 22, the drug injection status determination unit 24, the replenishment presence / absence detection unit 26, the defect detection unit 28, the power-off detection unit 30, and the storage unit 32 will be described later.

[0017] (Drug injection operation) The arrow 101 in FIG. 1 indicates the water treatment management device 1 before drug injection, the arrow F1 indicates the direction of change due to the drug injection operation, and the arrow 102 in FIG. 1 indicates the water treatment management device 1 after drug injection. L1 indicates the level of the chemical liquid 2 before drug injection, and L2 indicates the level of the chemical liquid 2 after drug injection. The arrow F3 indicates the change in the level of the chemical liquid 2 due to drug injection.

[0018] (Drug injection ratio) The chemical liquid usage amount / integrated calculation input amount is called the drug injection ratio. The calculation of the drug injection ratio is called ratio calculation.

[0019] (Chemical liquid usage amount) The chemical liquid usage amount refers to the amount of the chemical liquid 2 that has decreased in the chemical liquid tank 10. In the arrow 102 in FIG. 1, the chemical liquid usage amount is indicated by the arrow V1. The chemical liquid usage amount is obtained by the difference between the chemical liquid level L1 before drug injection and the chemical liquid level L2 after drug injection detected by the chemical liquid remaining amount detection unit 60. The chemical liquid usage amount is, for example, the decreased amount of the chemical liquid 2 detected by a sensor such as a chemical liquid level sensor. <雄文>

[0020] (Integrated calculation input amount) The integrated calculation input amount refers to the amount of the chemical liquid 2 that would have been injected through the drug injection pump 52. The integrated calculation input amount is calculated by the drug injection control unit 20 and the input amount calculation unit 22.

[0021] (Detection of drug injection defects) The water treatment management device 1 determines the quality of the chemical injection by comparing the amount of chemical used with the cumulative amount injected. If the amount of chemical used and the cumulative amount injected are equal, or if the difference between them is small, the chemical condition can be judged as good. This is because a small difference between the actual amount of chemical 2 used and the amount of chemical 2 that would have been injected means that chemical 2 was injected appropriately.

[0022] If there is a large difference between the amount of chemical solution used and the cumulative amount calculated and injected, the chemical solution condition can be judged as poor. This is because a large difference between the actual amount of chemical solution 2 lost and the amount of chemical solution 2 that would have been injected suggests that there is an abnormality in the chemical injection process. Factors that can lead to a poor chemical solution condition include a malfunction of the chemical injection pump 52, blockage in the flow path of chemical solution 2 such as the chemical injection line 50, or other factors that prevent the chemical solution 2 from being discharged.

[0023] When detecting drug injection defects using the drug injection ratio, a ratio of 1 or close to 1 indicates that the drug solution is in good condition. On the other hand, a ratio far from 1 indicates that the drug solution is in poor condition.

[0024] (Water treatment management methods) The water treatment management method of this embodiment will be explained with reference to Figure 2. Figure 2 is a diagram showing the remaining amount of chemical solution and the amount of chemicals added during a model period for explanation. In Figure 2, A shows the remaining amount of chemical solution, and B shows the amount of chemicals added. As an example, Figure 2 shows dates from 5 / 1 to 5 / 9. For example, 5 / 1 means May 1st.

[0025] The outline of the water treatment management method of this embodiment is as follows. In the water treatment management method of this embodiment, when it is time to perform the ratio calculation, the amount of chemicals to be added is accumulated sequentially, starting with the most recent data and going back to the oldest data. Then, when the accumulation calculation threshold for the amount of chemicals added becomes less than or equal to the accumulated value of the amount of chemicals added, the accumulation of the amount of chemicals added is stopped and the ratio calculation is performed.

[0026] (Time of ratio calculation) In the following explanation, the time at which the ratio calculation is performed will be assumed to be 0:00 (24:00). This time will be referred to as the ratio calculation time.

[0027] The remaining amount of chemical solution A indicates the amount of chemical solution 2 in the chemical solution tank 10. The remaining amount of chemical solution A is detected by the chemical solution remaining amount detection unit 60. The chemical solution remaining amount detection unit 60 constantly detects the remaining amount of chemical solution A.

[0028] The memory unit 32 is a part that stores the remaining amount of drug solution A detected by the drug solution remaining amount detection unit 60. As will be explained later, the drug injection status determination unit 24 can read the remaining amount of drug solution A from the memory unit 32 and determine whether the drug injection status is good or bad. The drug solution remaining amount detection unit 60 may also detect the remaining amount of drug solution A only at predetermined times, such as the time when the ratio calculation is performed.

[0029] The amount of chemical injected B is the amount of chemical solution that would have been injected. The amount of chemical injected B is determined by calculation. The amount of chemical injected B can be the discharge rate of the chemical injection pump 52 determined by calculation. The amount of chemical injected B is calculated by the injection amount calculation unit 22. The amount of chemical injected B is calculated at the time the ratio calculation is performed. For example, the amount of chemical injected on 5 / 1 is calculated at 24:00 on 5 / 1, that is, 0:00 on 5 / 2.

[0030] (Calculation period) The calculation of the amount of chemical to be added B is performed at regular intervals. This regular interval is called the calculation period. In Figure 2, the calculation period is indicated by a double-headed arrow P. In the example shown in Figure 2, the calculation period P is 24 hours. Also, in the example shown in Figure 2, the end of each calculation period P is the same as the time when the ratio calculation is performed.

[0031] (Target period) The assessment of the drug injection status is performed over a period consisting of one or more calculation periods P up to the time of ratio calculation. This period is called the target period Q. The assessment of the drug injection status is performed by the drug injection status assessment unit 24. The drug injection status assessment unit 24 determines whether the drug injection status is good or bad by comparing the cumulative calculated input amount, which is the sum of the drug input amounts B during the target period Q, with the decrease in the remaining drug solution amount A during the target period Q.

[0032] (Assessment of drug injection status) An example of determining the drug injection status will be explained. The drug injection status is determined based on the remaining drug solution A and the amount of drug added B at the end of the calculation period P, i.e., the time the ratio calculation is performed. An example of determining the drug injection status when the ratio calculation is performed at the end of May 3rd will be explained. In Figure 2, for example, 5 / 3E indicates the end of May 3rd.

[0033] The period covered in the 5 / 3E decision is indicated by the double arrow Q3. The period covered Q3 is from 0:00 on 5 / 1 to 24:00 on 5 / 3, i.e., from 0:00 on 5 / 4. The period covered Q3 consists of three calculation periods P. The period covered Q3 consists of calculation period P1 on 5 / 1, calculation period P2 on 5 / 2, and calculation period P3 on 5 / 3.

[0034] The decrease in the remaining amount of drug solution A during the target period Q3 is the amount obtained by subtracting the remaining amount of drug solution A3 at 0:00 on May 4 from the remaining amount of drug solution A0 at 0:00 on May 1.

[0035] The cumulative input amount for the target period Q3 is the sum of the chemical input amount B1 on 5 / 1, the chemical input amount B2 on 5 / 2, and the chemical input amount B3 on 5 / 3.

[0036] In determining the drug injection status in 5 / 3E, the decrease in the remaining drug solution volume A during the aforementioned period Q3 is compared with the cumulative amount injected during the same period Q3. The comparison is made by performing a ratio calculation. Furthermore, the drug injection status can be determined based on the calculated drug injection ratio value.

[0037] (Repeated assessment of drug injection status) The drug injection status determination unit 24 can repeatedly determine the drug injection status over time. For example, it can determine the drug injection status at 5 / 4E following the above-mentioned 5 / 3E. The target period when determining the drug injection status at 5 / 4E is shown as target period Q4.

[0038] When drug injection status is repeatedly assessed over time, consecutive assessments are referred to as the previous assessment and the next assessment. A portion of the period covered by the current assessment can overlap with a portion of the period covered by the previous assessment.

[0039] This explanation uses the judgment of drug injection status in 5 / 3E and the judgment of drug injection status in 5 / 4E as examples. The target period Q3 in the judgment of 5 / 3E and the target period Q4 in the judgment of 5 / 4E partially overlap. The calculation periods P2 and P3 overlap between the target period Q3 in the judgment of 5 / 3E and the target period Q4 in the judgment of 5 / 4E. By having the calculation periods P of the judgment subject to evaluation overlap in consecutive judgments, it is possible to increase the frequency of judgments while ensuring the amount of cumulative calculation input subject to evaluation.

[0040] (Integrated calculation input threshold) The drug injection status determination unit 24 can determine whether the drug injection status is good or bad when the cumulative calculation input amount exceeds a predetermined amount. In other words, instead of performing ratio calculations at all ratio calculation execution times, ratio calculations can be performed at ratio calculation execution times that meet predetermined conditions. The predetermined amount mentioned above is called the cumulative calculation input amount threshold.

[0041] When the drug injection status determination unit 24 has determined whether the drug injection status is good or bad, it can exclude older calculation periods P from the target period for the next determination, for example, until the cumulative calculated input amount falls below the cumulative calculated input amount threshold. Let's explain using the case where the cumulative calculated input amount threshold is 35.0L as an example.

[0042] (5 / 3E) In Figure 2, C represents the cumulative calculation input. At 5 / 3E, the cumulative calculation input for the target period Q3 is calculated by sequentially adding up the amounts from the calculation period P3, which is the calculation period P at the time of the decision, i.e., the calculation period P at the time the ratio calculation was performed. This results in the amount of chemicals added B3 + amount of chemicals added B2 + amount of chemicals added B1. The amount of chemicals added B3 is 10L, the amount of chemicals added B2 is 10L, and the amount of chemicals added B1 is 25L. The cumulative calculation input C accumulated from 5 / 3 to 5 / 2 is 20L, and the cumulative calculation input C accumulated from 5 / 3 to 5 / 1 is 45L.

[0043] The cumulative input volume C at 5 / 3E is 45L, which exceeds the cumulative input volume threshold of 35.0L. Therefore, at 5 / 3E, a judgment is made on whether the drug injection situation is good or bad. In other words, a ratio calculation is performed at 5 / 3E. In Figure 2, Y indicates that a ratio calculation is performed, and N indicates that a ratio calculation is not performed. 5 / 3E is Y.

[0044] The amount of chemical solution used in 5 / 3E is A0-A3. The ratio calculation in 5 / 3E is (A0-A3) / (B3+B2+B1).

[0045] This section explains data exclusion and carryover. In the target period Q3 of 5 / 3E, the cumulative calculated input amount C from the amount of chemical input B3 in calculation period P3 to the amount of chemical input B2 in calculation period P2 is 20L, which does not exceed the cumulative calculated input amount threshold of 35.0L. Therefore, the amount of chemical input B3 in calculation period P3 and the amount of chemical input B2 in calculation period P2 will be used in the next decision as well. In other words, calculation periods P3 and P2 are included in the target period Q4 in the decision of 5 / 4E.

[0046] In contrast, the cumulative calculated input amount C from the amount of drug input B3 in calculation period P3 to the amount of drug input B1 in calculation period P1 is 45L, which exceeds the cumulative calculated input amount threshold of 35.0L. This means that by excluding calculation period P1 in the target period Q3, the cumulative calculated input amount C falls below the cumulative calculated input amount threshold. Therefore, calculation period P1 is excluded from the target period in the next decision. In other words, calculation period P1 is not included in the target period Q4 in the decision of 5 / 4E. The amount of drug input B1 shown in box D1 in Figure 2 will not be used in the calculation of the cumulative calculated input amount C in the next decision.

[0047] (5 / 4E) This section explains how to determine the quality of drug injection in 5 / 4E. The target period Q4 for the 5 / 4E assessment is from calculation period P4 to calculation period P2. This is because, as mentioned above, calculation period P1 was excluded from the target period Q4. The cumulative calculated input volume C from calculation period P4 to calculation period P2 is 33L, which does not exceed the cumulative calculated input volume threshold of 35.0L. Therefore, no ratio calculation is performed in 5 / 4E.

[0048] (5 / 5E) This section explains how to determine the quality of drug injection in 5 / 5E. The target period Q5 for the 5 / 5E assessment is from calculation period P5 to calculation period P2. The cumulative calculated input amount C from calculation period P5 to calculation period P2 is 33L, which is the same as the cumulative calculated input amount C of 33L in 5 / 4E. This is because the drug input amount B5 in calculation period P5 is 0. The cumulative calculated input amount C in 5 / 5E does not exceed the cumulative calculated input amount threshold of 35.0L. Therefore, ratio calculations are not performed in 5 / 5E, as was done in 5 / 4E.

[0049] (5 / 6E) This section explains how to determine the quality of drug injection in 5 / 6E. The target period Q6 in the 5 / 6E assessment is from calculation period P6 to calculation period P2. The cumulative calculated input volume C from calculation period P6 to calculation period P2 is 38L, which exceeds the cumulative calculated input volume threshold of 35.0L. Therefore, a ratio calculation is performed in 5 / 6E.

[0050] In the target period Q6 of 5 / 6E, the cumulative calculated input amount C from the amount of drug input B6 in calculation period P6 to the amount of drug input B3 in calculation period P3 is 28L, which does not exceed the cumulative calculated input amount threshold of 35.0L. Therefore, the amount of drug input B6 from calculation period P6 to the amount of drug input B3 in calculation period P3 will also be used in the next judgment. In other words, calculation period P6 to calculation period P3 is included in the target period Q7 in the judgment of 5 / 7E.

[0051] In contrast, the cumulative calculated input amount C from the amount of drug input B6 in calculation period P6 to the amount of drug input B2 in calculation period P2 is 38L, which exceeds the cumulative calculated input amount threshold of 35.0L. This means that by excluding calculation period P2 in the target period Q6, the cumulative calculated input amount C falls below the cumulative calculated input amount threshold. Therefore, calculation period P2 is excluded from the target period in the next decision. In other words, calculation period P2 is not included in the target period Q7 in the decision of 5 / 7E. The amount of drug input B2 shown in box D2 in Figure 2 will not be used in the calculation of the cumulative calculated input amount C in the next decision.

[0052] (5 / 7E) This section explains how to determine the quality of drug injection in 5 / 7E. The target period Q7 for the 5 / 7E assessment is from calculation period P7 to calculation period P3. As mentioned above, calculation period P2 is excluded from the target period Q7. The cumulative calculated input amount C accumulated from calculation period P7 to calculation period P4 is 38L, which exceeds the cumulative calculated input amount threshold of 35.0L. Therefore, a ratio calculation is performed in 5 / 7E. Note that the cumulative calculated input amount C accumulated up to calculation period P4 exceeds the cumulative calculated input amount threshold. Therefore, the drug input amount B3 in calculation period P3 is not used in the decision of whether or not to perform a ratio calculation in the 5 / 7E assessment.

[0053] In response to not using the amount of chemical B3 added, the amount of chemical solution used in the ratio calculation will be the difference between the remaining amount of chemical solution A3 (5 / 4) and the remaining amount of chemical solution A7 (5 / 7).

[0054] In the target period Q7 of 5 / 7E, the cumulative calculated input amount C from the amount of chemical input B7 in calculation period P7 to the amount of chemical input B5 in calculation period P5 is 25L, which does not exceed the cumulative calculated input amount threshold of 35.0L. Therefore, the amount of chemical input B7 in calculation period P7 to the amount of chemical input B5 in calculation period P5 will also be used in the next judgment. In other words, calculation period P7 to calculation period P5 is included in the target period Q8 in the judgment of 5 / 8E.

[0055] In contrast, the cumulative calculated input amount C from the amount of drug input B7 in calculation period P7 to the amount of drug input B4 in calculation period P4 is 38L, which exceeds the cumulative calculated input amount threshold of 35.0L. This means that by excluding calculation periods P prior to calculation period P4 in the target period Q7, the cumulative calculated input amount C falls below the cumulative calculated input amount threshold. Therefore, calculation periods P4 and P3 are excluded from the target period Q in the next decision. In other words, calculation periods P4 and P3 are not included in the target period Q8 in the decision of 5 / 8E. The amount of drug input B4 shown in boxes D4 and D3 in Figure 2 will not be used in the calculation of the cumulative calculated input amount C in the next decision.

[0056] (5 / 8E) This section explains how to determine the quality of drug injection in 5 / 8E. The target period Q8 for the 5 / 8E assessment is from calculation period P8 to calculation period P5. This is because, as mentioned above, calculation periods P3 and P4 were excluded from the target period Q8. The cumulative calculated input volume C, accumulated from calculation period P8 to calculation period P5, is 25L, which does not exceed the cumulative calculated input volume threshold of 35.0L. Therefore, no ratio calculation is performed in 5 / 8E.

[0057] As described above, in the water treatment management device 1 and water treatment management method of this embodiment, the amount of chemicals added is accumulated from the most recent data to the past at regular intervals. When the accumulated amount of chemicals added exceeds the cumulative calculation threshold, a ratio calculation is performed. Furthermore, from the data used for the ratio calculation, data such as the oldest date that meets predetermined conditions will not be used in subsequent calculations, while other data can be reused in subsequent calculations.

[0058] Specifically, data prior to the day when the cumulative input threshold for drug administration was less than or equal to the cumulative value of drug administration will not be used in the next ratio calculation. In this way, by excluding only some data from the judgment of the quality of drug administration in the next calculation and carrying over some data to the next time, the time until the cumulative value of drug administration exceeds the cumulative input threshold for drug administration can be shortened. As a result, the frequency of ratio calculations can be increased, and the frequency of monitoring for drug administration defects can be increased.

[0059] If, after performing a ratio calculation, the data used in the calculation is excluded and the amount of chemicals added is accumulated again from zero, the frequency of performing the ratio calculation tends to decrease. The water treatment management device 1 and water treatment management method of this embodiment can suppress such a decrease in the frequency of performing ratio calculations.

[0060] In the above explanation, the ratio calculation time was set to 0:00 (24:00), and the calculation was performed daily. However, the time and interval of the ratio calculation are not limited to the example above. For example, the interval can be changed to every 12 hours or every 6 hours, etc.

[0061] Furthermore, even if the interval for performing provisional ratio calculations is shortened, the decrease in the accuracy of the ratio calculation results can be suppressed by deciding whether or not to actually perform the ratio calculation based on whether the cumulative calculation input amount > cumulative calculation input amount threshold is met. This is because the ratio calculation is performed only when a predetermined amount or more of the drug is injected, thus reducing the impact of sensor measurement errors due to small differences in the remaining amount of the drug solution.

[0062] (Embodiment 2) The water treatment management device 1 and water treatment management method of Embodiment 2 of the present invention will be described with reference to the drawings. Figure 3 shows the remaining amount of chemical solution A and the amount of chemicals added B during a model period for explaining Embodiment 2. The following description will focus on matters that differ from Embodiment 1. Matters not specifically described in the following description can be the same as in Embodiment 1.

[0063] In Embodiment 2, the replenishment of the chemical solution is taken into consideration in the ratio calculation. In the example shown in Figure 3, the chemical solution is replenished on 5 / 13. In Embodiment 2, the amount of chemical input B13 in calculation period P13 is set to 0. That is, the amount of chemical input B in calculation period P in which the chemical solution was replenished is excluded from the calculation of the cumulative input amount. However, the amount of chemical input B in calculation periods P prior to the calculation period P in which the chemical solution was replenished is retained and included in the calculation of the cumulative input amount. A detailed explanation follows below.

[0064] This section explains how to determine the quality of drug injection in 5 / 14E. The target period Q14 in the 5 / 14E assessment is assumed to be from calculation period P14 to calculation period P12. The cumulative calculated input amount for target period Q14 is the sum of drug input amounts B14, B13, and B12. However, drug input amount B13 in calculation period P13 is assumed to be zero. The cumulative calculated input amount for target period Q14 is the sum of drug input amounts B14 and B12.

[0065] The cumulative calculation input amount for the target period Q14 is indicated by the double arrow F15. The cumulative calculation input amount threshold is indicated by F16. The cumulative calculation input amount F15 is greater than the cumulative calculation input amount threshold F16. In 5 / 14E, a ratio calculation is performed.

[0066] The amount of medication used during the target period Q14 is the sum of the decrease in the remaining medication volume A and the amount replenished. This is because medication replenishment was carried out during the calculation period P13. The calculation period P13 is called the replenishment period.

[0067] The difference between the remaining amount of drug solution A11 at the end of calculation period P11, i.e., 0:00 on 5 / 12, and the remaining amount of drug solution A14 at the end of calculation period P14, i.e., 0:00 on 5 / 15, is indicated by a double arrow F11.

[0068] The replenishment of the drug solution during the target period P13 is indicated by the symbol G. The amount of replenishment G is indicated by the double arrow F12. The amount of replenishment G F12 is the difference between the remaining drug solution A13 and the remaining drug solution A12.

[0069] The amount of medication used during the target period Q14 is the sum of the difference in the remaining amount of medication F11 and the amount of medication replenished F12, which is F13. In other words, the amount of change in the remaining amount of medication during the target period Q14 is represented by F13.

[0070] In the ratio calculation in 5 / 14E, the ratio of the amount of chemical used (change in the amount of chemical remaining) F13 to the cumulative input amount F15 is calculated.

[0071] (Detection of replenishment) The detection of whether or not the chemical solution has been replenished is explained below. Whether or not the chemical solution has been replenished is detected by the replenishment detection unit 26. The replenishment detection unit 26 receives the chemical solution level of chemical solution 2 in the chemical solution tank 10, as detected by the chemical solution remaining amount detection unit 60. The replenishment detection unit 26 compares the chemical solution remaining amount A at the start of the calculation period P with the chemical solution remaining amount A at the end of the calculation period P. If the chemical solution remaining amount A has increased, it is determined that the chemical solution has been replenished. For example, in the calculation period P13, if the chemical solution remaining amount A13 is greater than the chemical solution remaining amount A12, it is determined that the chemical solution was replenished during the calculation period P13.

[0072] The replenishment detection unit 26 may determine that a replenishment of the chemical solution occurred if the remaining amount A of the chemical solution increased during the calculation period P. The chemical solution remaining amount detection unit 60 continuously detects the chemical solution level of the chemical solution 2 in the chemical solution tank 10. The detected chemical solution level is input to the replenishment detection unit 26. If the input chemical solution level increases, the replenishment detection unit 26 may determine that a replenishment of the chemical solution occurred during that calculation period P.

[0073] The replenishment detection unit 26, when comparing the remaining amount of drug solution, may not simply compare the magnitude or whether there is an increase, but may also determine that replenishment of the drug solution has occurred if there is a difference or increase that exceeds a predetermined threshold. Such thresholds are called replenishment detection thresholds.

[0074] In the water treatment management device 1 and water treatment management method of this embodiment, in the calculation period P in which chemical replenishment is detected, the amount of chemical replenishment F12 is added to the amount of chemical replenishment used, and the amount of chemical input B in that calculation period P is invalidated. In other words, the amount of chemical input B in that calculation period P is set to zero and excluded from the ratio calculation. However, the data for calculation periods P prior to the calculation period P in which chemical replenishment was detected is not reset and is retained. This makes it possible to shorten the time until the cumulative calculation input amount exceeds the cumulative calculation input amount threshold, and to increase the frequency of ratio calculations.

[0075] In the water treatment management device 1 and water treatment management method of this embodiment, even when the replenishment of chemical solution is detected, data such as the amount of chemical added up to that point is not reset. Therefore, even when chemical solution is replenished frequently, ratio calculations can be performed without reducing the frequency. As a result, the frequency of monitoring for chemical injection defects can be increased.

[0076] (Embodiment 3) The water treatment management device 1 and water treatment management method of Embodiment 3 of the present invention will be described with reference to the drawings. Figure 4 shows the remaining amount of chemical solution A and the amount of chemicals added B during a model period for the explanation of Embodiment 3. The following description will focus on matters that differ from Embodiment 1 or Embodiment 2. Matters not specifically described in the following description can be the same as in Embodiment 1 or Embodiment 2.

[0077] In Embodiment 3, malfunctions of the chemical solution remaining amount detection unit 60 and power outages are taken into consideration in the ratio calculation. In the example shown in Figure 4, malfunctions of the chemical solution remaining amount detection unit 60 occurred on May 22, 23, and 24. Power outages also occurred on May 25, 26, and 27.

[0078] (Faulty chemical solution level detection unit) The following describes a malfunction of the chemical solution remaining amount detection unit 60. A malfunction of the chemical solution remaining amount detection unit 60 refers to, for example, when the chemical solution remaining amount detection unit 60 is a chemical solution level sensor, the chemical solution level sensor does not sense the chemical solution level. The chemical solution remaining amount detection unit 60 is determined to be malfunctioning when the power to the water treatment management device 1 is on, but the detection result of the chemical solution remaining amount from the chemical solution remaining amount detection unit 60 is not input to the chemical injection control unit 20.

[0079] The malfunction detection unit 28 detects any defects in the drug solution remaining amount detection unit 60. The malfunction detection unit 28 can determine that the drug solution remaining amount detection unit 60 is defective if, for example, the drug solution remaining amount detection result is not input to the drug injection control unit 20 at a predetermined time.

[0080] If chemical replenishment is performed while the chemical replenishment level detection unit 60 is determined to be faulty, the system may not be able to detect that chemical replenishment has been performed, even if the fault in the chemical replenishment level detection unit 60 is later resolved. If the system cannot detect that chemical replenishment has been performed, the ratio calculation will not be performed accurately. Therefore, the data of the amount of chemicals added B for calculation periods P prior to the calculation period P in which the fault in the chemical replenishment level detection unit 60 was detected is deleted. Calculation periods P prior to the calculation period P in which the fault in the chemical replenishment level detection unit 60 was detected are excluded from the target period Q. In other words, the amount of chemicals added B for calculation periods P prior to when the chemical replenishment level detection unit 60 was faulty is not used in the ratio calculation. This prevents inaccurate ratio calculations. The ratio calculation procedure is resumed after the fault in the chemical replenishment level detection unit 60 is resolved, that is, after the chemical replenishment level detection unit 60 returns to a normal state.

[0081] Furthermore, if the chemical solution remaining amount detection unit 60 returns to a normal state after a malfunction is detected in the chemical solution remaining amount detection unit 60, before the end of the calculation period P, the data for the calculation period P that includes the time when the malfunction of the chemical solution remaining amount detection unit 60 was detected will not be deleted. In other words, if the time of the ratio calculation is not included in the period during which the malfunction of the chemical solution remaining amount detection unit 60 is detected, the data for the calculation period P that includes that period will not be deleted.

[0082] Let's explain this in detail with reference to Figure 4. Periods M1 and M2 in Figure 4 indicate the period during which a malfunction in the chemical solution remaining amount detection unit 60 is detected. Period M1 starts during calculation period P22 and ends during calculation period P23. Period M1 includes 0:00 on 5 / 23, which is the end of calculation period P22, the time when the ratio calculation is performed. Therefore, the remaining amount of chemical solution A22 on 5 / 22E is unknown. Accordingly, the amount of chemicals added B in calculation period P prior to calculation period P23, which is the calculation period P on 5 / 23, is excluded from the target period Q. Chemicals added B23, chemicals added B22, and chemicals added B21 are not used in the ratio calculation. In other words, the existing calculation data that has already been stored, chemicals added B22 and chemicals added B21, and the calculation data that will be stored next time, chemicals added B23, are made unusable and will not be used in the proportional calculation. The boxed area D11 in Figure 4 shows the portion of the data that will not be used in the ratio calculation.

[0083] In contrast, period M2 on 5 / 24 began after 0:00 on 5 / 24 and ended before 0:00 on 5 / 25. No remaining drug solution A was detected. Therefore, drug input amount B will not be excluded from the target period Q. Drug input amount B24 in calculation period P24 will not be deleted and will be used in the ratio calculation along with data from calculation period P24 and earlier.

[0084] (Power outage) Let me explain about power outages. Drug injections will not be performed during a power outage. Therefore, the data for drug injection amount B will not be deleted, and we will check whether or not the drug solution was replenished during the power outage period.

[0085] Refer to Figure 4 for explanation. Power outage period N1 begins during calculation period P25 and ends during calculation period P26. Assume that no chemical solution is replenished during calculation period P25, but that chemical solution is replenished during calculation period P26. The boxed area D30 in Figure 4 indicates that chemical solution replenishment D30 occurred during calculation period P26. Power outage period N2 begins during calculation period P27 and ends during calculation period P27. Assume that no chemical solution is replenished during calculation period P27.

[0086] Since no replenishment of the drug solution was performed during calculation period P25, the drug input amount B25 for calculation period P25 is not considered invalid. On the other hand, replenishment of the drug solution was performed during calculation period P26. Therefore, the drug input amount B26 for calculation period P26 is considered invalid. In Figure 4, N / A means invalid.

[0087] Since no replenishment of the drug solution was performed during calculation period P27, the amount of drug input B27 during calculation period P27 is not considered invalid.

[0088] Let's explain the ratio calculation. As mentioned earlier, the amount of chemicals B added during calculation periods P23, P22, and P21, indicated by box D11, is not used in the calculation of the cumulative amount added. Also, the amount of chemicals B added during calculation period P26, indicated by boxes D23 to D25, is not used in the calculation of the cumulative amount added.

[0089] Furthermore, the amount of chemicals to be added, B, shown in boxes D21 and D22, will not be used in the next ratio calculation if the cumulative calculation threshold is 35L.

[0090] If the ratio calculation is performed on 5 / 25E, the power outage will occur at 0:00 on 5 / 26, the time the ratio calculation is performed. Therefore, the remaining amount of chemical solution A at the time the ratio calculation is performed is not detected. Thus, instead of the remaining amount of chemical solution A at 0:00 on 5 / 26, the remaining amount of chemical solution A25 at the time the power outage period N1 in the calculation period P25 begins can be used as the remaining amount of chemical solution A on 5 / 25E. This is because the chemical solution remaining amount detection unit 60 continuously detects the remaining amount of chemical solution until the power outage occurs.

[0091] The aforementioned power interruption detection unit 30 is the part that detects when the power supply to the drug solution remaining amount detection unit 60 is interrupted. If the power supply to the power interruption detection unit 30 is interrupted due to a power outage or the like, the power interruption detection unit 30 detects that the power supply has been interrupted. Then, when power is restored, the drug injection status determination unit 24 reads the drug solution remaining amount A detected at the time the power supply was interrupted from the storage unit 32. In this way, if the power supply to the drug solution remaining amount detection unit 60 is interrupted due to a power outage or the like, the drug solution remaining amount A detected at the time of the interruption is set as the drug solution remaining amount A for the calculation period P that includes the time of the interruption.

[0092] (Water treatment management method process flow) The processing flow of the water treatment management method will be explained with reference to Figures 5A and 5B. Figures 5A and 5B are flowcharts showing the flow of ratio calculation in the water treatment management method according to an embodiment of the present invention. Figure 5B is a flowchart showing the flow following Figure 5A. "A" and "B" in Figure 5A indicate the same positions in the ratio calculation flow as "A" and "B" in Figure 5B, respectively. Also, in Figures 5A, 5B, and the following description, S1 indicates step 1. The same applies to the other steps.

[0093] (S1) In S1, the flow for calculating the drug injection ratio begins.

[0094] (S2) Step S2 is a step to determine whether or not it is time to perform the ratio calculation. If it is time to perform the ratio calculation, the step proceeds to S3. If it is not time to perform the ratio calculation, the step goes through S2 again. Note that if the time to perform the proportional calculation crosses over during a power outage, it is considered to be time to perform the proportional calculation when power is restored after the power outage.

[0095] (S3) Step S3 is a step to determine whether or not a detection failure has been detected in the remaining liquid solution detection unit. Step S3 corresponds to the failure detection process. If a detection failure has been detected, the step proceeds to S4. If a detection failure has not been detected, the step proceeds to S5.

[0096] (S4) In S4, existing stored computational data and the computational data to be stored next are made unusable. After S4, the process proceeds back to S2.

[0097] (S5) S5 checks the input amount and remaining drug solution amount for the most recent period as the first calculation data and shifts the existing calculation data by one position. In other words, the drug input amount B and remaining drug solution amount A for the most recent calculation period P are stored in the drug injection status determination unit as the first calculation data. The data from the calculation period P immediately preceding the most recent calculation period P is then used as the second calculation data.

[0098] (S6, S7) Step S6 is a step to determine whether or not the chemical solution has been replenished. Step S6 corresponds to the replenishment detection step. As mentioned above, whether or not the chemical solution has been replenished can be determined, for example, if the remaining amount of chemical solution A in the first calculation data is greater than or equal to the replenishment detection threshold in the second calculation data. If it is determined that the chemical solution has been replenished, the step proceeds to S7. If it is not determined that the chemical solution has been replenished, the step proceeds to S8.

[0099] (S7) S7 is the step in which the first calculation data is processed. At this time, the amount of drug added B during the calculation period P in which it is determined that drug replenishment occurred is set to zero, and this calculation period P is designated as the replenishment period. In addition, the amount of replenishment is determined to be the increase in the remaining amount of drug A in the first calculation data relative to the remaining amount of drug A in the second calculation data. After S7, the process proceeds to step S8.

[0100] (S8) Step S8 is the step where n=0 in the calculation data.

[0101] (S9) S9 is the step to determine whether or not there is usable computational data. If there is usable computational data, the process proceeds to S10. If there is no usable computational data, the process returns to S2.

[0102] (S10) Step S10 is a step in which n+1 is performed on the calculation data, the calculated drug input amounts B from the first to the nth calculation data are added together, and the cumulative calculated input amount is calculated. Part of S10 corresponds to the calculation process. In S10, the drug input amounts B included in the target period Q for judging the quality of drug injection are accumulated to obtain the cumulative calculated input amount. The step then proceeds to S11.

[0103] (S11) S11 is a step in which the cumulative input amount calculated in S10 is compared with the cumulative input amount threshold. If the cumulative input amount is greater than the cumulative input amount threshold, the step proceeds to S12. If the cumulative input amount is not greater than the cumulative input amount threshold, the step returns to S9 and the input amount is accumulated.

[0104] (S12) S12 is a step in which calculation data prior to the nth step is made unusable. Specifically, drug input amounts B included in older calculation periods P are excluded for the next judgment on the quality of drug injection until the cumulative calculation input amount falls below the cumulative calculation input amount threshold. The step then proceeds to S13.

[0105] (S13, S14, S15) Step S13 is the step to determine whether the drug injection ratio is normal or abnormal. S13 corresponds to the judgment process. If the drug injection ratio is greater than the lower limit of the ratio and less than the upper limit of the ratio, the drug injection ratio is determined to be normal. The process proceeds to step S14. If the drug injection ratio is below the lower limit of the ratio, or above the upper limit of the ratio, the drug injection ratio is determined to be abnormal. The process proceeds to step S15.

[0106] The drug injection ratio is calculated using the following formula. (((n+1th drug solution remaining A) - (1st drug solution remaining A) + (amount replenished during replenishment period)) / (cumulative calculation input amount)

[0107] The assessment of the quality of the drug injection status is continued and performed each time the cumulative calculated input amount exceeds the cumulative calculated input amount threshold. The step returns to S2 from S14 or S15.

[0108] The embodiments of the present invention have been described above. The present invention is not limited to the embodiments described above, and various modifications, variations, and combinations are possible.

[0109] <1> The system comprises a chemical solution tank for storing the chemical solution, a chemical solution remaining amount detection unit for detecting the remaining amount of chemical solution in the chemical solution tank, an input amount calculation unit for calculating the amount of chemical solution that would have been injected from the chemical solution tank, and a chemical injection status determination unit for determining whether the chemical injection status is good or bad. The input amount calculation unit calculates the input amount for each calculation period, The drug injection status determination unit determines whether the drug injection status is good or bad by comparing the cumulative amount of drug injected during the target period consisting of one or more calculation periods up to the time of determination with the amount of change in the remaining amount of drug solution during the target period. The aforementioned drug injection status determination unit repeatedly performs the determination over time. If the consecutive judgments mentioned above are considered the previous judgment and the next judgment, A water treatment management device in which a portion of the target period in the current judgment may overlap with a portion of the target period in the previous judgment.

[0110] <2> The aforementioned drug injection status determination unit determines whether the drug injection status is good or bad when the cumulative calculated input amount exceeds the input amount threshold. When the drug injection status determination unit determines whether the drug injection status is good or bad, it excludes some older calculation periods and makes those calculation periods available for use in the next target period. <1> The water treatment management device described above.

[0111] <3> The system further includes a replenishment detection unit that detects whether or not the chemical solution has been replenished in the chemical solution tank. The aforementioned drug injection status determination unit excludes the amount injected during the calculation period in which the replenishment presence / absence detection unit detected the replenishment from the cumulative calculated amount injected. <1> or <2> The water treatment management device described above.

[0112] <4> The system further includes a malfunction detection unit for detecting a malfunction in the aforementioned drug solution remaining amount detection unit, The drug injection status determination unit obtains the remaining amount of drug solution at the end of the calculation period from the drug solution remaining amount detection unit, If the calculation period ends while the malfunction detection unit detects a malfunction in the drug solution remaining amount detection unit, the drug injection status determination unit excludes the calculation period prior to the calculation period in which the drug solution remaining amount was obtained from the target period. <1> from <3> A water treatment management device described in any one of the following.

[0113] <5> The system further includes a power interruption detection unit that detects the interruption of the power supply to the chemical solution remaining amount detection unit, When the power interruption detection unit detects an interruption in the power supply to the drug solution remaining amount detection unit, the drug injection status determination unit shall use the drug solution remaining amount detected at the time of the interruption as the drug solution remaining amount during the calculation period including the time of the interruption. <1> from <4> A water treatment management device described in any one of the following.

[0114] <6> A calculation process that calculates the amount of chemical solution to be added for each calculation period, The system includes a determination step that determines whether the drug injection situation is good or bad by comparing the cumulative input amount, which is the sum of the input amounts during the target period consisting of one or more calculation periods up to the time of determination, with the change in the amount of drug solution remaining during the target period. The aforementioned decision-making process is repeated over time. If the consecutive decision steps are referred to as the previous decision step and the current decision step, A water treatment management method in which a portion of the aforementioned target period may overlap with a portion of the aforementioned target period in the previous judgment.

[0115] <7> In the aforementioned determination step, if the cumulative input amount exceeds the input amount threshold, the quality of the drug injection is determined. <6> The water treatment management method described below.

[0116] <8> In the aforementioned judgment process, after determining the quality of the drug injection, some older calculation periods are excluded, and some calculation periods are made available for use in the next target period. <7> The water treatment management method described below.

[0117] <9> The system further includes a replenishment detection step that detects whether or not the chemical solution has been replenished in the chemical solution tank. In the replenishment detection step, the input amount for the calculation period in which replenishment was detected is excluded from the cumulative calculation input amount. <6> from <8> A water treatment management method described in any one of the following.

[0118] <10> The remaining amount of the drug solution is detected by the drug solution remaining amount detection means. The system further includes a defect detection step for detecting whether or not there is a defect in the aforementioned drug solution remaining amount detection means, If the drug solution remaining amount detection means is faulty when the calculation period ends, the calculation period prior to that calculation period is excluded from the target period. <6> from <9> A water treatment management method described in any one of the following.

[0119] <11> The remaining amount of the drug solution is detected by the drug solution remaining amount detection means. If the power supply to the chemical solution remaining amount detection means is interrupted, the chemical solution remaining amount detected at the time of the interruption shall be set as the chemical solution remaining amount during the calculation period including the time of the interruption. <6> from <10> A water treatment management method described in any one of the following.

[0120] [Contribution to the United Nations-led Sustainable Development Goals (SDGs)] This disclosure includes matters that contribute to achieving Sustainable Development Goals (SDGs) Goal 6, "Clean Water and Sanitation for All," and Goal 9, "Industry, Innovation and Infrastructure." [Explanation of Symbols]

[0121] 1. Water treatment management system 2. Medicinal solution 10 Chemical tanks 20 Drug injection control unit 22 Input amount calculation section 24 Drug Injection Status Judgment Department 26 Replenishment detection unit 28. Defect detection unit 30 Power interruption detection unit 32 Storage section 50 drug injection lines 52 Chemical injection pump 54 Pump control signal 60. Drug solution remaining amount detection unit 110 Boilers F1 Arrow Drug injection action F3 Arrow: Decreased amount of medication remaining L1 Drug level before injection L2 Drug level after drug injection V1 Medication usage amount

Claims

1. The system comprises a chemical solution tank for storing the chemical solution, a chemical solution remaining amount detection unit for detecting the remaining amount of chemical solution in the chemical solution tank, an input amount calculation unit for calculating the amount of chemical solution that would have been injected from the chemical solution tank, and a chemical injection status determination unit for determining whether the chemical injection status is good or bad. The input amount calculation unit calculates the input amount for each calculation period, The drug injection status determination unit determines whether the drug injection status is good or bad by comparing the cumulative amount of drug injected during the target period consisting of one or more calculation periods up to the time of determination with the amount of change in the remaining amount of drug solution during the target period. The aforementioned drug injection status determination unit repeatedly performs the determination over time. If the consecutive judgments mentioned above are considered the previous judgment and the next judgment, A water treatment management device in which a portion of the target period in the current judgment may overlap with a portion of the target period in the previous judgment.

2. The aforementioned drug injection status determination unit determines whether the drug injection status is good or bad when the cumulative calculated input amount exceeds the input amount threshold. The water treatment management device according to claim 1, wherein the chemical injection status determination unit, when it has determined whether the chemical injection status is good or bad, excludes some older calculation periods and makes some calculation periods available for use in the next target period.

3. The system further includes a replenishment detection unit that detects whether or not the chemical solution has been replenished in the chemical solution tank. The water treatment management device according to claim 1 or 2, wherein the chemical injection status determination unit excludes the amount injected during the calculation period in which the replenishment presence / absence detection unit detected the replenishment from the cumulative calculated amount injected.

4. The system further includes a malfunction detection unit for detecting a malfunction in the aforementioned drug solution remaining amount detection unit, The drug injection status determination unit obtains the remaining amount of drug solution at the end of the calculation period from the drug solution remaining amount detection unit, If the calculation period ends while the fault detection unit detects a fault in the remaining amount of chemical solution detection unit, the chemical injection status determination unit excludes the calculation period prior to the calculation period in which the remaining amount of chemical solution was obtained from the target period, as described in claim 1 or 2.

5. The system further includes a power interruption detection unit that detects the interruption of the power supply to the chemical solution remaining amount detection unit, The water treatment management device according to claim 1 or 2, wherein the chemical injection status determination unit, when the power interruption detection unit detects an interruption in the supply of power to the chemical solution remaining amount detection unit, uses the chemical solution remaining amount detected at the time of the interruption as the chemical solution remaining amount during the calculation period including the time of the interruption.

6. A calculation process that calculates the amount of chemical solution to be added for each calculation period, The system includes a determination step that determines whether the drug injection situation is good or bad by comparing the cumulative input amount, which is the sum of the input amounts during the target period consisting of one or more calculation periods up to the time of determination, with the change in the amount of drug solution remaining during the target period. The aforementioned decision-making process is repeated over time. If the consecutive decision steps are referred to as the previous decision step and the current decision step, A water treatment management method in which a portion of the aforementioned target period may overlap with a portion of the aforementioned target period in the previous judgment.

7. The water treatment management method according to claim 6, wherein in the judgment step, if the cumulative input amount exceeds the input amount threshold, the quality of the chemical injection status is determined.

8. The water treatment management method according to claim 7, wherein, in the judgment step, after making a judgment on the quality of the chemical injection status, some older calculation periods are excluded and some calculation periods are made available for use in the next target period.

9. The system further includes a replenishment detection step that detects whether or not the chemical solution has been replenished in the chemical solution tank. The water treatment management method according to claim 6 or 7, wherein the amount of input during the calculation period in which replenishment was detected in the replenishment presence / absence detection step is excluded from the cumulative calculation input amount.

10. The remaining amount of the drug solution is detected by the drug solution remaining amount detection means. The system further includes a defect detection step for detecting whether or not there is a defect in the aforementioned drug solution remaining amount detection means, The water treatment management method according to claim 6 or 7, wherein if the chemical solution remaining amount detection means is faulty when the calculation period ends, the calculation period prior to the calculation period is excluded from the target period.

11. The remaining amount of the drug solution is detected by the drug solution remaining amount detection means. The water treatment management method according to claim 6 or 7, wherein if the power supply to the chemical solution remaining amount detection means is interrupted, the chemical solution remaining amount detected at the time of the interruption is set to the chemical solution remaining amount during the calculation period including the time of the interruption.

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