Injection control device, injection control method, and injection control program of agent

Abstract

To provide an injection control device, an injection control method, and an injection control program of an agent, capable of determining proper injection rate of an agent.SOLUTION: An injection control device of an agent of the present invention is an injection control device of an agent to be used in a water treatment system and comprises a first model learned so as to output an injection ratio of an agent for injection to water to be treated from a water quality of the water to be treated and a second model learned so as to output water quality of treatment water formed by injection of the agent to the water to be treated based on the injection ratio of the agent calculated by the water quality of the water to be treated and the first model.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a chemical injection control device, an injection control method, and an injection control program for use in a water treatment system. [Background technology]

[0002] In a water treatment system, for example, a coagulant is injected into a chemical mixing tank to mix the turbid matter with the coagulant and form microflocs. Then, in a downstream sedimentation tank, the grown flocs settle and the water is purified. In such a water treatment system, various attempts have been made to determine an appropriate coagulant injection rate. For example, Patent Document 1 proposes predicting the injection rate of chemicals (coagulant, chlorine, activated carbon) using a decision tree learning algorithm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2017-123088 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the actual operation data used as the teacher data in the learning algorithm as described above, there are cases where the chemical is excessively injected in consideration of the safety of the water treatment. Therefore, in this learning algorithm, there is a risk that an excessive injection rate is output as a predicted value, and there is room for improvement. In addition, in such water treatment, the above-mentioned problems exist not only in the injection of the coagulant, but also in the injection of chemicals in general for water treatment. The present invention has been made to solve this problem, and aims to provide a chemical injection control device, an injection control method, and an injection control program that can determine the appropriate injection amount of the chemical. [Means for solving the problem]

[0005] The chemical injection control device of the present invention is a chemical injection control device used in a water treatment system, and is equipped with a first model trained to output an injection rate of a chemical to be injected into the water to be treated based on the water quality of the water to be treated, and a second model trained to output the water quality of treated water generated by injecting the chemical into the water to be treated, based on the water quality of the water to be treated and the injection rate of the chemical calculated by the first model.

[0006] The chemical injection control method of the present invention is a chemical injection control method used in a water treatment system, and includes the steps of: outputting an injection rate of a chemical to be injected into the treated water from the water quality of the water to be treated using a first model trained to output the injection rate of the chemical to be injected into the treated water from the water quality of the water to be treated; and outputting the water quality of the treated water from the water quality of the water to be treated and the injection rate of the chemical calculated by the first model using a second model trained to output the water quality of treated water generated by injecting the chemical into the treated water from the water quality of the water to be treated and the injection rate of the chemical calculated by the first model.

[0007] The chemical injection control program of the present invention is a chemical injection control program used in a water treatment system, and causes a computer to execute the following steps: outputting the injection rate of the chemical to be injected into the treated water from the water quality of the water to be treated using a first model trained to output the injection rate of the chemical to be injected into the treated water from the water quality of the water to be treated; and outputting the water quality of the treated water from the water quality of the water to be treated and the injection rate of the chemical calculated by the first model, using a second model trained to output the water quality of treated water generated by injecting the chemical into the treated water from the water quality of the water to be treated and the injection rate of the chemical calculated by the first model. Effect of the Invention

[0008] According to the present invention, it is possible to determine the appropriate dosage of a drug in a filtration system. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing an example of a rapid filtration system to which a coagulant injection control device according to the present invention is applied. [Diagram 2] 1 is an example of a block diagram showing a hardware configuration of an embodiment of a coagulant injection control device according to the present invention. [Diagram 3] FIG. 2 is an example of a block diagram showing a software configuration of an embodiment of the coagulant injection control device according to the present invention. [Figure 4] 4 is an example of an operation of the determination unit in FIG. 3. [Diagram 5] 4 is an example of an operation of the determination unit in FIG. 3. [Figure 6] 1 is a flowchart showing an example of a method for controlling injection of a flocculant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, in which the chemical injection control device according to the present invention is applied to an injection control device for a coagulant. First, a rapid filtration system in which the injection control device is used will be described, and then the injection control device will be described.

[0011] <1. Filtration system> FIG. 1 is a schematic diagram showing an example of a rapid filtration system. As shown in FIG. 1, this rapid filtration system includes a receiving well 11, a chemical mixing basin 12, a flocculation basin 13, a sedimentation basin 14, and a rapid filtration basin 15, which are arranged from the upstream side to the downstream side, and water is sent in this order. The receiving well 11 receives raw water (water to be treated) taken from a water intake facility installed in a river or the like. The raw water received in the receiving well 11 is sent to the chemical mixing basin 12. In addition, a water quality measuring instrument 16 measures the water quality (turbidity, pH, alkalinity, water temperature, chromaticity, UV, etc.) of the raw water in the receiving well 11. In the chemical mixing basin 12, a flocculant is injected by a flocculant injection device 17 and is quickly stirred. This mixes the turbid matter with the flocculant. In the flocculation basin 13, the microflocs formed in the chemical mixing basin 12 are gently stirred to promote the growth of flocs. Then, in the settling basin 14, the grown flocs settle, and the load of suspended solids is reduced. A turbidity meter 18 measures the turbidity of the water (treated water) discharged from the settling basin 14. In the rapid sand filter basin 15, the water after the flocs have settled is purified through a fine sand layer, and the suspended solids are finally removed. Thereafter, although not shown, chlorine is added to the purified water, and it is sent to a distribution reservoir.

[0012] <2. Hardware configuration of the injection control device> The injection control device 2 according to this embodiment is a device that controls the injection of a coagulant into a rapid filtration system. FIG. 2 shows an example of a hardware configuration of the injection control device 2. The injection control device 2 is a computer to which a control unit 21, a storage unit 22, an external interface 23, and a communication interface 24 are electrically connected. Such a computer may be, for example, a general-purpose personal computer, a dedicated computer, or a tablet computer. The injection control device 2 may also be composed of multiple computers. In FIG. 2, the external interface 23 and the communication interface 24 are described as an "external I / F" and a "communication I / F".

[0013] The control unit 21 includes a CPU, RAM, ROM, etc., and is configured to execute various information processing based on programs and data. The storage unit 22 is configured with an auxiliary storage device such as an HDD, SSD, etc., and stores an injection control program 221, raw water quality data 222, coagulant injection rate data 223, sedimentation water turbidity data 224, control data 225, and various data for driving the injection control device 2.

[0014] The injection control program 221 is a program for controlling the injection of a coagulant, as described below. The raw water quality data 222 is data on the quality of the raw water measured by the water quality measuring instrument 16 over a predetermined period of time. The coagulant injection rate data 223 is data on the injection rate of the coagulant injected into the chemical mixing basin 12 over a predetermined period of time. The settling basin 14 turbidity data 224 is data on the turbidity of the settling basin measured by the turbidimeter 18 over a predetermined period of time. The control data 225 is various data for controlling the rapid sand filtration basin.

[0015] The external interface 23 is an interface for connecting to an external device, and is configured appropriately according to the external device to be connected. In this embodiment, the external interface 23 is connected to a display device 4 and an input device 5. The display device 4 is, for example, a display, and is used to display various data such as input and output. The display is not particularly limited, and a known liquid crystal display or the like can be used. The input device 5 is, for example, a keyboard, a mouse, etc., and is used to perform the above-mentioned input. In addition, various external devices can be connected to the external interface 23 as appropriate. For example, a touch panel display that also serves as the display device 4 and the input device 5 can be used.

[0016] The communication interface 24 is, for example, a wired LAN (Local Area Network) module, a wireless LAN module, etc., and is an interface for performing wired or wireless communication. That is, the communication interface 24 is an example of a communication unit configured to communicate with the water quality measuring instrument 16, the coagulant injection device 17, the turbidity meter 18, and other devices.

[0017] In addition, the specific hardware configuration of the coagulant injection control device 2 can be appropriately omitted, replaced, or added to components according to the embodiment. For example, the control unit 21 may include multiple processors. The control unit 21 may be configured with an FPGA. The storage unit 22 may be configured with a RAM and a ROM included in the control unit 21.

[0018] <3. Software configuration of the drug injection control device> Fig. 3 shows an example of the software configuration of a drug injection control device. The following processing is performed in the injection control device 2. That is, when the control unit 21 of the injection control device 2 loads the injection control program 221 stored in the storage unit 22 into the RAM, the control unit 21 interprets and executes the injection control program 221 by the CPU, and functions as a first model 211, a second model 212, and a determination unit 213 as shown in Fig. 3.

[0019] The first model 211 is a trained model trained to input the quality of raw water and output the injection rate of the coagulant injected into the chemical mixing tank 12. That is, the first model 211 is trained by machine learning using the quality of raw water measured by the water quality measuring instrument 16 during a predetermined period and the injection rate of the coagulant injected into the raw water as teacher data. As a result, when the quality of raw water measured by the water quality measuring instrument 16 is input to the first model 211, the corresponding injection rate of the coagulant is output. The above-mentioned predetermined period is not particularly limited, and may be any period during which teacher data required for machine learning can be collected. In addition, it is not necessary to use all of the above-mentioned parameters such as turbidity for the quality of raw water as an input, and at least one of them may be used. This is also true for the second model 212.

[0020] The second model 212 is a trained model trained to input the coagulant injection rate and the water quality of the raw water output by the first model 211 and output the turbidity of the precipitated water. That is, the second model 212 is machine-trained using the coagulant injection rate and the water quality of the raw water output by the first model 211 for a predetermined period and the corresponding turbidity of the precipitated water measured by the turbidimeter 18 as teacher data. As a result, when the coagulant injection rate output by the first model 211 and the water quality of the raw water measured by the water quality measuring instrument 16 are input to the second model 212, the corresponding turbidity of the precipitated water is output.

[0021] The machine learning used in constructing the first model 211 and the second model 212 is not particularly limited, and a machine learning model with teacher data as described above can be used. For example, a neural network, a Light GBM (Light Gradient Boosting Machine), etc. can be used, but is not limited to these.

[0022] The determination unit 213 outputs an appropriate injection rate of the flocculant based on the turbidity of the sedimentation water output by the second model 212. For example, as shown in FIG. 4, when the target value of the turbidity is set to 1.0 degrees and the appropriate range is set to within 0.1 degrees (0.9 to 1.0 degrees) from the target value, if the turbidity of the sedimentation water output through the first model 211 and the second model 212 is 0.5 degrees (the injection rate at this time is 30 mg / L), it is considered that the turbidity is excessively reduced. Therefore, in this case, the determination unit 213 can determine that the flocculant is excessively injected. When the determination unit 213 determines in this way, the injection rate of the flocculant injected into the second model 212 is reduced. In the example of FIG. 4, 90% of the injection rate of the flocculant calculated by the first model 211 is input into the second model 212 as the second injection rate, and the turbidity of the sedimentation tank 14 is output. As a result, if the turbidity is 0.7 degrees, the determination unit 213 determines that it is still outside the appropriate range.

[0023] Therefore, the determination unit 213 inputs 80% of the injection rate of the flocculant output by the first model 211 into the second model 212 as the third injection rate, and outputs the turbidity of the settling basin 14. If the turbidity is 0.9 degrees as a result, the determination unit 213 determines that the turbidity is appropriate, and outputs 24 mg / L, which is the injection rate at this time, as the appropriate injection rate. Therefore, the injection control device 2 drives the flocculant injector 17, and injects the flocculant into the chemical mixing basin 12 according to this injection rate.

[0024] In the example of FIG. 4, the injection rate of the flocculant is reduced by 10%, but this is only an example, and the setting of the reduction in the injection rate of the flocculant from the second time onwards can be changed as appropriate. In other words, the rate of reduction of the injection rate does not have to be constant and can be changed as appropriate. In addition, it is not limited to the rate of injection rate, and the amount of reduction of the injection rate itself can be adjusted, such as reducing by 1 mg / L. The amount of reduction of the injection rate does not have to be constant and can be changed as appropriate. Furthermore, depending on the output turbidity, the injection rate can be increased. For example, if the appropriate turbidity is exceeded by the third injection of the flocculant (for example, if the turbidity becomes greater than 1.0), the injection rate of the flocculant can be increased from the third injection (for example, an injection rate between the second and third injection rates, such as 25 mg / L, is adopted) and the flocculant can be injected again. In addition, the target value and appropriate range of turbidity described above are also only an example, and can be set as appropriate.

[0025] Moreover, when the turbidity of the settling basin output by the second model 212 is higher than the target value, the opposite process to that of Fig. 4 is performed as shown in Fig. 5. That is, the injection rate of the coagulant is increased by a predetermined value (for example, by 10%) until the turbidity of the settling basin becomes equal to or lower than the target value. This makes it possible to obtain an appropriate injection amount even when the output turbidity is higher than the target value.

[0026] In addition to the above controls, the injection control device 2 can also perform various controls of the rapid filtration system, such as controlling the stirring intensity and rotation speed in the flocculation basin 13.

[0027] <4. Operation of the injection control device> Next, the operation of the coagulant injection control device 2 configured as above will be described with reference to the flow chart of FIG.

[0028] As shown in FIG. 6, first, the injection control device 2 measures the water quality of the raw water, inputs it to the first model 211, and outputs the coagulant injection rate (step S1). Next, the injection control device 2 inputs the coagulant injection rate and the water quality of the raw water output by the first model 211 to the second model 212, and outputs the turbidity of the precipitated water (step S2). Next, if the determination unit 213 determines that the output turbidity is equal to or lower than the target value (YES in step S3), and further determines that the turbidity is lower than the target value by a predetermined value or more (YES in step S4), the coagulant injection rate is reduced by a predetermined percentage (for example, reduced by 10%) as described above, and a new coagulant injection rate is set (step S5). Then, the injection control device 2 inputs the newly set coagulant injection rate to the second model 212, and outputs the turbidity of the precipitated water (step S6). If the judgment unit 213 judges that the turbidity of the output sedimentary water is lower than the target value by a predetermined value or more (YES in step S4), the flocculant injection rate is further reduced by a predetermined percentage (for example, by a further 10%) and a new flocculant injection rate is set (step S5).

[0029] In this manner, steps S4 to S6 are repeated, and if it is not determined that the output turbidity is lower than the target value by a predetermined value or more (NO in step S4), the coagulant injection rate is deemed appropriate, and coagulant is injected from the coagulant injection device 17 into the chemical mixing pond 12 (step S7).

[0030] On the other hand, if the judgment unit 213 judges that the output turbidity is higher than the target value (NO in step S3), the flocculant injection rate is increased by a predetermined percentage (e.g., increased by 10%) and a new flocculant injection rate is set (step S8). Then, the injection control device 2 inputs the newly set flocculant injection rate into the second model 212 and outputs the turbidity of the settled water (step S9). If the judgment unit 213 judges that the output turbidity of the settled water is higher than the target value (YES in step S10), the flocculant injection rate is further increased by a predetermined percentage (e.g., increased by another 10%) and a new flocculant injection rate is set (step S8).

[0031] In this manner, steps S8 to S10 are repeated, and if the output turbidity is not determined to be higher than the target value (NO in step S10), the flocculant injection rate is deemed appropriate, and flocculant is injected from the flocculant injection device 17 into the chemical mixing pond 12 (step S7).

[0032] <5.Features> As described above, according to this embodiment, the following effects can be obtained. (1) In this embodiment, the appropriate injection amount of the coagulant can be determined by combining the first model 211 and the second model 212. In the first model 211, the injection rate of the coagulant corresponding to the water quality of the raw water can be predicted by constructing a relationship between the water quality of the raw water and the injection rate of the coagulant for that water quality. In addition, the reason for combining the second model 212 is as follows.

[0033] In the operation of the rapid filtration system, the injection rate of the coagulant may be set high for safety reasons. Therefore, the first model 211, which is learned using actual operation data, may output an injection rate that is higher than necessary. Therefore, by predicting the turbidity of the settling tank using the second model 212, it is possible to determine whether the injection rate is appropriate. As described above, for example, when the predicted turbidity is lower than the target value by a predetermined value or more, it is possible to determine that the injection rate is higher than necessary. Based on this, a decision can be made to reduce the injection rate, and therefore the cost of the coagulant can be reduced. Therefore, according to the injection control device 2 of this embodiment, it is possible to achieve both improvement of water quality and reduction in costs.

[0034] (2) By providing the determination unit 213 as described above, when the turbidity of the settling tank is lower than a predetermined value, an injection rate of the coagulant that automatically results in an appropriate turbidity can be obtained.

[0035] <6. Variations> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. In addition, the following modified examples can be appropriately combined. In addition, the following modified examples can be combined with the above-mentioned embodiment.

[0036] (1) In the above embodiment, the injection control device 2 has the determination unit 213 as a software configuration, but the determination unit 213 is not necessarily required. For example, the injection control device 2 can be configured to output the turbidity of the settling water. In this case, the user of the injection control device 2 can determine whether the output turbidity of the settling tank is appropriate, and can determine the amount of coagulant to be injected based on the determination.

[0037] (2) In general, when a rapid filtration system is in normal operation, the water quality of the receiving well 11 is often below a predetermined value (when the water quality is not bad), and a lot of operation data can be obtained. In addition, since jar tests can be performed at a predetermined frequency, it is also possible to add supplementary operation data. In such a case, as described above, the injection rate of the coagulant tends to be set high, and therefore the first model 211 and the second model 212 are used in combination as described above.

[0038] On the other hand, in the case of non-normal operation such as rainy weather, that is, when the water quality of the receiving well 11 is higher than a predetermined value (when the water quality is poor), there is not much operation data and there is also little jar test data, so it is considered that the prediction accuracy of the turbidity of the settled water with the injection rate of the coagulant varied is low. Also, when the water quality fluctuates in this way, the operation is often performed with emphasis on the quality of the treated water, and it is considered that there is little need to consider the appropriateness of the cost of the coagulant. In such a case, the injection rate of the coagulant can be calculated using only the first model 211, and the coagulant can be injected using this. In other words, it is also possible to perform an operation that reproduces the past operating state without using the second model 212.

[0039] (3) The configuration of the rapid filtration system is not limited to that shown in FIG. 1, and may be modified as appropriate as long as the above-mentioned first model 211 and second model 212 can be constructed.

[0040] In the above embodiment, the present invention is applied to an injection control device for injecting a coagulant into a rapid filtration system, but the present invention is not limited to coagulants and can be applied to any water treatment system for improving the water quality of the water to be treated by injecting chemicals such as chlorine, activated carbon, and chemicals for removing mold odors. Therefore, when applying the injection control device of the present invention to such a water treatment system, the location where the chemicals are injected into the water to be treated and the location where the water quality of the treated water improved by the chemicals are evaluated can be appropriately changed depending on the type of chemical.

[0041] (4) In the above embodiment, the turbidity of the sedimentation basin is output in the second model, but the water quality of the sedimentation basin and the filtration basin can also be output. For example, the sedimentation water color, the filtrate water turbidity, the filtrate water UV, etc. can be used as the water quality of the sedimentation basin and the filtration basin.

[0042] (5) In the first model 211 and the second model 212, the injection rate of the flocculant is used as the output or input, but a value equivalent to the injection rate of the flocculant, for example, the injection amount of the flocculant, can also be used. Therefore, in the present invention, the injection rate of the flocculant can be considered to be equivalent to the injection amount of the flocculant. [Explanation of symbols]

[0043] 2: Coagulant injection control device 211: First model 212: 2nd model 213: Judgment section

Claims

1. A chemical injection control device for use in a water treatment system, comprising: A first model that is trained to output an injection rate of a chemical to be injected into the water to be treated based on the water quality of the water to be treated; A second model that is trained to output the water quality of treated water generated by injecting the chemical into the water to be treated based on the water quality of the water to be treated and the injection rate of the chemical calculated by the first model; A drug injection control device comprising:

2. Further comprising a judgment unit for judging suitability of the water quality of the treated water calculated by the second model. The drug injection control device according to claim 1 .

3. The determination unit is When it is determined that the water quality of the precipitated water calculated by the second model is better than a target value, a first step of reducing the injection rate of the chemical input to the second model according to a regulation and outputting the water quality of the treated water by the second model; A second step of determining whether the water quality of the output treated water is closer to the target value than the predetermined value; Execute The drug injection control device according to claim 2 .

4. The determination unit is The first step and the second step are performed at least once until it is determined in the second step that the water quality of the output treated water is closer to the target value than the predetermined value. The drug injection control device according to claim 3.

5. 2. The chemical injection control device according to claim 1, wherein when the water quality of the water to be treated is deteriorated, the chemical injection rate is determined using only the first model.

6. 1. A method for controlling chemical injection for use in a water treatment system, comprising: A step of outputting an injection rate of a chemical to be injected into the water to be treated based on the water quality of the water to be treated using a first model trained to output the injection rate of the chemical to be injected into the water to be treated based on the water quality of the water to be treated; A step of outputting the water quality of the treated water from the water quality of the water to be treated and the injection rate of the chemical calculated by the first model using a second model that has been trained to output the water quality of the treated water generated by injecting the chemical into the water to be treated from the water quality of the water to be treated and the injection rate of the chemical output by the first model; A method for controlling drug injection comprising:

7. A chemical injection control program for use in a water treatment system, comprising: On the computer, A step of outputting an injection rate of a chemical to be injected into the water to be treated based on the water quality of the water to be treated using a first model trained to output the injection rate of the chemical to be injected into the water to be treated based on the water quality of the water to be treated; A step of outputting the water quality of the treated water from the water quality of the water to be treated and the injection rate of the chemical calculated by the first model using a second model that has been trained to output the water quality of the treated water generated by injecting the chemical into the water to be treated based on the water quality of the water to be treated and the injection rate of the chemical calculated by the first model; A drug injection control program that executes the above.

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