JP2007061800A - Flocculant injection controller to be applied to water treatment plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flocculant injection controller in which parameters required to calculate an injection rate of a flocculant are adjusted automatically, so that the flocculant injection can suitably be controlled efficiently on the basis of the quality of raw water. <P>SOLUTION: The flocculant injection controller 20 for controlling a flocculant injection facility 13 is provided with an optimum parameter outputting part 23 for setting parameters for a flocculant injection rate calculating part 24. The optimum parameter outputting part 23 includes a proper data selecting part 231 for extracting actual result value data from a data storage part 22 and a parameter identifying part 232 for identifying parameters on the basis of the extracted actual result value data when a judgement part 230 for judging whether parameters are corrected judges unsuitably. The parameter identifying part 232 sets suitable calculated parameters into the flocculant injection rate calculating part 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flocculant injection control device that is applied to a water treatment plant such as a water purification plant and controls flocculant injection.

  Generally, in a water treatment plant such as a water purification plant, there is a process for settling and removing suspended suspended matters contained in raw water. This process includes an agglomeration process operation in which an agent called a flocculant is injected to form a floc and increase the sedimentation rate to increase removal efficiency.

  In the coagulation process operation, a feedforward control method is employed in which an appropriate coagulant injection rate (ie, injection amount) based on the quality of raw water (turbidity, pH, water temperature, etc.) is calculated and controlled. In this case, a process for identifying a parameter for calculating the injection rate is required.

As a prior art, the future treated water quality is predicted from the raw water quality and the present coagulant injection rate using the neural network method, and the deviation between the target water quality and the predicted treated water quality is calculated. An apparatus for automatically adjusting parameters by executing relearning of a neural network so as to be within a predetermined range has been proposed (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 11-23351

  The agglomeration process operation for calculating an appropriate flocculant injection rate is possible, such as with the prior art described above. However, each time there is a change in water quality (change of intake system) or a change in equipment conditions, it is necessary to adjust the parameter setting value for calculating the injection rate. Adjustment of this parameter is a difficult task because it requires not only a lot of work time but also familiarity with control technology and plant know-how.

  Accordingly, an object of the present invention is to enable the automatic adjustment of parameters necessary for the calculation of the flocculant injection rate so that appropriate flocculant injection control based on the quality of raw water can be efficiently performed. An object of the present invention is to provide an agent injection control device.

  According to the present invention, for example, in a water treatment plant such as a water treatment plant, the adjustment of parameters necessary for the calculation of the coagulant injection rate can be automatically performed, so that appropriate coagulant injection control based on the quality of raw water can be efficiently performed. The flocculant injection control device can be provided.

  A flocculant injection control device according to an aspect of the present invention is a turbidity measuring means for measuring the raw water turbidity processed in the water treatment plant in the flocculant injection control device for controlling the flocculant injection equipment of the water treatment plant. And data storage means for accumulating the flocculant injection rate data and the raw water turbidity measurement value data measured by the turbidity measurement means as actual value data when the flocculant is injected from the flocculant injection facility And, based on the raw water turbidity measured by the turbidity measuring means and the actual value data stored in the data storage means, for calculating the injection rate of the flocculant according to the appropriate value of the raw water turbidity Optimal parameter setting means for identifying appropriate parameters, and calculation means for calculating the injection rate of the flocculant using the parameters set by the optimal parameter setting means, Serial based on the injection rate of the flocculant which is calculated by the calculation means is configured such that and means for controlling the injection of the coagulant from the coagulant injection equipment.

  Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a water purification plant (water treatment plant) 1 and a flocculant injection control device 20 according to the present embodiment.

  The water purification plant 1 is provided with a landing well 3, an activated carbon contact basin 4, a mixing basin 5, a flock formation pond 6, and a settling basin 7, and a plurality of water intake processes, flocculant injection processes, flock formation processes, precipitation filtration processes, and the like. Water purification process is performed.

  In the water intake process, for example, raw water is taken from a plurality of water intake sources A to D and flows into the landing well 3 through pipes. The raw water from each of the water intake sources A to D is measured by flow meters 2a to 2d provided in the respective pipes. Water intake flow rate data from the flow meters 2a to 2d is sent as plant data to a data measuring unit 21 included in the flocculant injection control device 20.

  Raw water taken into the landing well 3 is subjected to treatment such as deodorization by an activated carbon adsorption process in the activated carbon contact pond 4. In the activated carbon contact pond 4, the raw water sample is taken out by the sampling pump 4 a, and the water temperature, turbidity, and PH are measured by the water temperature meter 8, the turbidity meter 9, and the PH meter 10. These measured values are sent to the data measuring unit 21 as plant data.

  From the activated carbon contact basin 4, it flows into the mixing basin 5 through a pipe. The inflow flow rate data measured by the flow meter 11 provided in the pipe is sent to the data measuring unit 21 as plant data. In the mixing basin 5, a flocculant injection process in which the flocculant is injected from the flocculant injection equipment 13 is executed. The flocculant injection facility 13 is controlled by the flocculant injection control device 20 through the injection amount control unit 14 as described later.

  The raw water into which the flocculant has been injected in the mixing basin 5 is sent to the flock formation pond 6. In the flock formation pond 6, a flock formation process is performed in which the turbidity contained in the raw water is flocked. Furthermore, in the sedimentation basin 7, the turbidity of the raw water is removed by a precipitation filtration process.

  At the outlet of the sedimentation basin 7, the raw water sample is taken out by the sampling pump 7a, and the raw water turbidity at the sedimentation basin outlet is measured by the sedimentation basin outlet turbidimeter 12. The measured value data of the raw water turbidity at the outlet of the settling basin is accumulated in the data storage unit 22 as plant data.

  Here, the flocculant injection control device 20 executes injection control of the flocculant appropriate for the raw water to be treated so that the measured value of the raw water turbidity at the settling basin outlet becomes an appropriate value (target value). As the flocculant, for example, polyaluminum chloride (PAC), aluminum sulfate (sulphate) and the like are widely used.

(Configuration of flocculant injection control device)
The flocculant injection control device 20 includes a data measurement unit 21, a data storage unit 22, an optimum parameter derivation unit 23, a flocculant injection rate calculation unit 24, a water temperature correction unit 25, an upper / lower limit correction unit 26, and raw water turbidity at the settling basin outlet. An input unit 27 for inputting an appropriate value of the degree and an input unit 28 for a jar test result are provided. Specifically, the flocculant injection control device 20 is configured with a computer system and software as main elements.

  The data measuring unit 21 collects and processes plant data (measured value data) indicating process state quantities such as the flocculant injection rate and raw water turbidity. The data storage unit 22 accumulates each measurement value data (plant data) output from the data measurement unit 21 as an actual value of the process state quantity. Further, the data storage unit 22 stores measurement value data of the sedimentation tank outlet turbidity measured by the sedimentation tank outlet turbidimeter 12 and the jar test result (flocculating agent injection rate) input from the input unit 28. That is, the data storage unit 22 accumulates actual value data including the flocculant injection rate and each measurement value data.

  The jar test is a test for determining an appropriate flocculant injection rate by measuring an actual flocculant injection rate with respect to a measurement result of raw water turbidity sampled by an operator or the like. The data storage unit 22 stores a jar test result (see FIG. 7) input from the input unit 28 by an operator's operation.

  As will be described later, the coagulant injection rate calculation unit 24 uses the parameters set by the optimum parameter deriving unit 23 to calculate the coagulant injection rate for executing injection control of coagulant appropriate for the raw water. .

  The water temperature correction unit 25 outputs a correction value for correcting the injection rate of the coagulant calculated to the coagulant injection rate calculation unit 24 based on the water temperature measurement value data from the data measurement unit 21. The upper / lower limit correction unit 26 corrects the values exceeding the upper limit and the lower limit with respect to the coagulant injection rate calculated by the coagulant injection rate calculation unit 24 based on a preset reference allowable range. . That is, the upper and lower limit correction unit 26 determines whether or not the injection amount output from the coagulant injection facility 13 is within an allowable range based on the injection rate calculated by the coagulant injection rate calculation unit 24. When the determination result is outside the allowable range, the calculation output of the calculation unit 24 is corrected to be within the allowable range.

  The optimum parameter derivation unit 23 includes a parameter correction availability determination unit 230, an appropriate data selection unit 231, and a parameter identification unit 232. The parameter correction availability determination unit 230 determines whether or not the current parameters and the flocculant injection rate are appropriate based on the appropriate values of the raw water turbidity at the sedimentation basin outlet input from the input unit 27. If the parameter correction availability determination unit 230 determines that the parameter correction is inappropriate, it outputs a parameter correction request to the appropriate data selection unit 231.

  When there is a parameter correction request from the parameter correction availability determination unit 230, the appropriate data selection unit 231 is not an abnormal value such as PH or water temperature among the actual value data stored in the data storage unit 22, In addition, only the actual value data where the raw water turbidity at the outlet of the sedimentation basin is below the appropriate value is extracted.

  The parameter identification unit 232 identifies (or corrects) adjustment parameters a, b, and n, which will be described later, based on the actual value data extracted from the appropriate data selection unit 231. Further, the parameter identification unit 232 uses the coagulant injection rate obtained by removing the correction value output from the water temperature correction unit 25 from the coagulant injection rate included in the actual value data extracted from the appropriate data selection unit 231. Identify the parameters.

(Operation of flocculant injection control device)
The flocculant injection control device 20 controls the injection rate (injection amount) of the flocculant supplied from the flocculant injection equipment 13 when executing the flocculant injection process in the mixing basin 5. In the water purification plant, factors affecting the turbidity of the treated purified water (disturbances) depend on the raw water turbidity, water temperature, raw water PH, stirring intensity in the mixing pond 5 (stirring pond), and the state of the sedimentation basin. It is necessary to inject an appropriate flocculant.

  Here, before the influence (effect) due to the injection of the flocculant from the flocculant injection facility 13 appears in the measured value of the raw water turbidity at the sedimentation tank outlet (output of the turbidimeter 12), Generally, it takes about 3 to 4 hours although it varies depending on the flow rate. For this reason, in the feedback control system which calculates the coagulant injection rate based on the measured value of the raw water turbidity at the settling basin outlet, appropriate coagulant injection cannot be performed. Therefore, the flocculant injection control device 20 calculates the injection rate of the flocculant to be injected from each measurement value (raw water turbidity, water temperature, raw water PH) regarding the raw water quality, and feeds the appropriate flocculant injection control. Execute with forward control.

  In the feedforward control, the control target is a flocculant injection process (from the flocculant injection point (mixing basin 5) to the outlet of the sedimentation basin 7). The control input is the flocculant injection rate, and the control output is the turbidity at the sedimentation tank outlet (measured value of the turbidimeter 12). Examples of the disturbance include raw water turbidity, water temperature, and raw water PH.

(Calculation processing of coagulant injection rate)
In the coagulant injection control device 20, the coagulant injection rate calculation unit 24 derives an appropriate coagulant injection rate based on the raw water turbidity by a general calculation formula as shown in the following formula (1).

  The flocculant injection control device 20 controls the flocculant injection for setting the turbidity of the raw water to an appropriate value by appropriately setting the adjustment parameters a, b, and n. The adjustment parameters a, b, and n are identified by the optimum parameter deriving unit 23 and set in the coagulant injection rate calculating unit 24.

  Hereinafter, the procedure of the parameter identification process of the optimum parameter derivation unit 23 will be described with reference to the flowchart of FIG.

  First, the parameter correction availability determination unit 230 determines whether the parameters and the flocculant injection rate at the current flocculant injection rate calculation unit 24 are appropriate (step S1). If the parameter correction availability determination unit 230 determines that the parameter correction is inappropriate, it outputs a parameter correction request to the appropriate data selection unit 231 (NO in step S1).

  The parameter correction propriety determination unit 230, as a specific determination method, measures the raw water turbidity at the sedimentation basin outlet output from the turbidimeter 12 at the present time, and the raw water turbidity at the sedimentation basin outlet input from the input unit 27. And a parameter correction request is output when the appropriate value is smaller.

  When there is a parameter correction request from the parameter correction availability determination unit 230, the appropriate data selection unit 231 indicates that the raw water PH or the water temperature is not an abnormal value from the actual value data stored in the data storage unit 22, and Only the performance data whose raw water turbidity at the outlet of the sedimentation basin is less than the appropriate value is extracted (step S2).

  Here, the appropriate data selection unit 231 can extract only the actual value data that matches the specified conditions (conditions such as PH, weather, season, etc.) from the data storage unit 22. In addition, the appropriate data selection unit 231 takes into account the retention time of the treated water from the raw water turbidity measurement point (9) to the turbidity measurement point (12) at the settling basin outlet, from the data storage unit 22 It is also possible to extract performance value data obtained by moving the data in time. Furthermore, the appropriate data selection unit 231 can select appropriate actual value data from the data storage unit 22 based on the values of the water intake ratios of a plurality of water intake systems A to D. Furthermore, the appropriate data selection unit 231 can also extract actual value data from which the jar test result is valid from the data storage unit 22.

  The parameter identification unit 232 identifies the adjustment parameters a, b, and n based on the actual value data extracted from the appropriate data selection unit 231 (step S3). As a specific method, there is a method to which the following least square method is applied.

That is, when the logarithm of the model formula shown in the above formula (1) is taken, it can be transformed into the formula shown in the following formula (2).

  The appropriate data selection unit 231 determines parameters a, b, and n based on the extracted actual values P and Tb so that the square error is minimized (YES in step S4, S5).

Here, a parameter identification method when the unknown parameter b is a constant will be described. If “yi = log (Al ₂ O ₃ -b)” and “A = log a, xi = log Tb”, they can be expressed as the following formula (3).

Therefore, the square error J, which is an evaluation criterion, can be calculated by the following equation (4).

Since this is a quadratic form, the least square error can be calculated by differentiating it with respect to the unknown parameter θ.

When this is expanded, the following equation (6) is obtained.

When the calculation is further advanced, a result as shown in the following formula (7) is obtained.

  Therefore, when the unknown parameter b is fixed, the arithmetic expression becomes linear, and therefore the unknown parameters a and n can be uniquely solved by the least square method. When adjusting the parameter b at the same time, the parameter b is changed within an appropriate range, and a, b, and n when the value of J is minimized are output as parameters.

  The flocculant injection rate calculation unit 24 injects the raw water turbidity at an appropriate settling basin outlet based on the parameters (a, b, n) output from the parameter identification unit 232 and the raw water turbidity value. The power coagulant injection rate is calculated by the above equation (1).

  The injection amount control unit 14 controls the amount of coagulant injection from the coagulant injection facility 13 based on the coagulant injection rate calculated by the coagulant injection rate calculation unit 24. That is, the flocculant injection facility 13 injects an appropriate flocculant in consideration of the inflow rate of the mixing basin 5 so that the flocculant injection rate calculated by the flocculant injection rate calculator 24 is obtained.

  However, in general, since the coagulant injection facility 13 has a range in which the coagulant can be injected, the upper and lower limit correction unit 26 is within the range in which the coagulant injection facility 13 can inject, as described above. If it is out of range, correct it to be within range. Specifically, since the maximum and minimum injection amounts of the flocculant injection equipment 13 are often determined, when the injection amount is out of the range, for example, when the maximum injection amount is exceeded, the maximum injection amount To correct the injection.

  In addition, it is known that the aggregation efficiency decreases when the raw water temperature is low. The parameter identification unit 232 determines the water temperature data of the raw water and the coagulant injection rate measured by the data measurement unit 21 when the calculation formula of the coagulant injection rate changes according to the raw water temperature by the water temperature correction unit 25 described above. Based on the output from the calculation unit 24, it is also possible to perform parameter identification after removing the water temperature correction from the actual value data of the coagulant injection rate. Hereinafter, it demonstrates concretely with reference to Formula (8)-(10).

That is, for example, when there is a water temperature correction F (t) as shown in the following equation (8), the parameter identification unit 232 extracts only raw water temperature data and deforms it as shown in the following equation (9). After performing, parameter identification is performed according to the procedure after the formula (2).

Here, there are various functional forms of F (t) as shown in the following formula (10). FIG. 2 shows an example of the function.

  Here, when the raw water temperature t is lower than Tmin (for example, 5 ° C.), the equation (8) increases the injection rate by multiplying the basic term of the flocculant injection rate with respect to the raw water turbidity by F (t). Shows that When the raw water temperature t is equal to or higher than Tmin (for example, 5 ° C.), centering on Tmid (for example, 20 ° C.), when the raw water temperature is lower than Tmid, Fmid and Fmax at a low rate of the water temperature. The flocculant injection rate target value is increased by multiplying a certain value (a value of 1 or more) between the two. In addition, when the raw water temperature is higher than Tmid, it indicates that the target value of the flocculant injection rate is decreased by multiplying a certain value (a value of 1 or less) between Fmid and Fmin at a high rate of the water temperature. Yes. Thereby, stable flocculant injection control with little influence of water temperature can be performed.

  As described above, according to the present embodiment, it is possible to automatically adjust appropriate parameters for calculating the flocculant injection rate in accordance with changes in raw water quality (turbidity change) and changes in equipment conditions. Therefore, based on the calculation result of the coagulant injection rate, the coagulant injection control (feedforward control) of the coagulant injection facility 13 can always be appropriately performed, and the number of work steps required for parameter adjustment can be reduced. Thereby, as a result, it becomes possible to always realize appropriate flocculant injection control by capturing changes in the raw water quality and changes in the aggregation state due to seasonal fluctuations in real time.

[Second Embodiment]
FIG. 4 is a diagram illustrating a configuration of the water purification plant (water treatment plant) 1 and the flocculant injection control device 20 according to the second embodiment.

  In the present embodiment, the optimum parameter derivation unit 23 includes a parameter validity determination unit 233. Since other configurations are the same as those shown in FIG. 1, the same reference numerals are given and description thereof is omitted.

  The parameter validity determination unit 233 determines whether or not the parameter output from the parameter identification unit 232 is appropriate. If this determination result is appropriate, the parameter output from the parameter identification unit 232 is output to the coagulant injection rate calculation unit 24 as it is. On the other hand, when the determination result is inappropriate, the parameter validity determination unit 233 outputs the actual value data extraction request again to the appropriate data selection unit 231.

  Hereinafter, the procedure of the optimum parameter derivation unit 23 of the present embodiment will be described with reference to the flowchart of FIG.

  First, the parameter correction propriety determination unit 230 determines whether the parameters and the coagulant injection rate in the current coagulant injection rate calculation unit 24 are appropriate (step S11). If the parameter correction availability determination unit 230 determines that the parameter correction is inappropriate, it outputs a parameter correction request to the appropriate data selection unit 231 (NO in step S11). When there is a parameter correction request from the parameter correction availability determination unit 230, the appropriate data selection unit 231 indicates that the raw water PH or the water temperature is not an abnormal value from the actual value data stored in the data storage unit 22, and Only the performance data whose raw water turbidity at the outlet of the sedimentation basin is less than the appropriate value is extracted (step S12).

  The parameter identification unit 232 identifies the adjustment parameters a, b, and n based on the actual value data extracted from the appropriate data selection unit 231 (step S13). The appropriate data selection unit 231 determines parameters a, b, and n based on the extracted actual values P and Tb so that the square error is minimized (YES in step S14, YES in steps S15 and S16).

  The parameter validity determination unit 233 determines whether or not the determined corrected parameters a, b, and n are valid (step S17). If the determination result is appropriate, the parameter output from the parameter identification unit 232 is output as it is to the coagulant injection rate calculation unit 24 (YES in step S17). On the other hand, if the determination result is inappropriate, the parameter validity determination unit 233 outputs the actual value data extraction request again to the appropriate data selection unit 231 (NO in step S17).

  The appropriate data selection unit 231 extracts the actual value data from the data storage unit 22 under conditions different from the previous data extraction conditions, and outputs them to the parameter identification unit 232. The parameter validity determination unit 233 compares the error of the calculation result according to the equation (1) when using the parameters before and after correction, and if the corrected value is more accurate, the parameter is appropriate. It is judged that. In this case, accuracy means the rate of increase of the coagulant injection rate, which is the calculation result, and the higher the rate of increase, the higher the accuracy.

  When the determination result is inappropriate, the parameter validity determination unit 233 indicates the parameters before and after parameter correction, and the reason for determining that the parameter is inappropriate, for example, an output device (see FIG. (Not shown). Thereby, the operator can determine whether or not to correct the parameter based on the reason for determining that the output is inappropriate. In this case, instead of the parameter identification unit 232, an operator may set a correction parameter in the coagulant injection rate calculation unit 24 from an input device (not shown).

  As described above, according to the present embodiment, more appropriate coagulant injection control can be realized by determining the validity of the parameter after the parameter correction.

[Third Embodiment]
FIG. 6 is a diagram illustrating a configuration of a water purification plant (water treatment plant) 1 and a flocculant injection control device 20 according to the third embodiment.

  In the present embodiment, the flocculant injection control device 20 includes a display unit 29 for presenting the aggregation state of the raw water to the operator. Other configurations are the same as those shown in FIG. 4, and thus the same reference numerals are given and description thereof is omitted.

  For example, as shown in FIG. 7, the display unit 29 of the present embodiment determines whether the current coagulant injection rate is under-injection or over-injection based on the jar test result input from the input unit 28. The relationship between the current flocculant injection rate and the measurement result of the raw water turbidity is displayed. That is, the display unit 29 can present the current coagulant injection rate and the raw water aggregation state to the operator. As described above, the jar test is a test for measuring an actual coagulant injection rate with respect to the measurement result of the raw water turbidity sampled by an operator or the like and obtaining an appropriate coagulant injection rate.

  Here, the jar test is a test by an operator for appropriately changing the flocculant injection rate injected into the collected treated water within a certain range and determining which injection rate is appropriate. In this case, it is confirmed that the raw water turbidity is increased not only because the flocculant injection rate is low, but also when the injection rate is too high. Accordingly, as shown in FIG. 7, the display unit 29 of the present embodiment displays, for example, a graph indicating the position of the current injection rate in the reaction from the result of the jar test, so that the operator can display the current flocculant. Whether the injection rate is under-injection or over-injection can be determined.

  In short, in the present embodiment, it is possible to grasp the state of aggregation of the raw water with respect to the current coagulant injection rate from the result of the jar test.

  In the first to third embodiments described above, the parameter identification process of the optimum parameter derivation unit 23 has been described as being realized by a computer system. However, the present invention is not limited to this, and the connection is made through a communication line. A configuration realized by a server is also possible. Specifically, for example, parameters obtained by the process model identification calculation are provided by HTML dynamically created from an application service provider (ASP) via the Internet.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure which shows the structure of the coagulant | flocculant injection | pouring control apparatus regarding the 1st Embodiment of this invention. The figure which shows an example of the water temperature correction function regarding this embodiment. The flowchart for demonstrating the procedure of the parameter identification process regarding this embodiment. The figure which shows the structure of the coagulant | flocculant injection control apparatus regarding 2nd Embodiment. The flowchart for demonstrating the procedure of the parameter identification process regarding 2nd Embodiment. The figure which shows the structure of the coagulant | flocculant injection control apparatus regarding 3rd Embodiment. The figure which shows the jar test result regarding 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water purification plant, 13 ... Coagulant injection equipment, 20 ... Coagulant injection control apparatus, 21 ... Data measurement part,
22 ... Data measuring unit, 22 ... Data storage unit, 23 ... Optimal parameter deriving unit,
24 ... flocculant injection rate calculation unit, 25 ... water temperature correction unit, 26 ... upper and lower limit correction unit,
27, 28 ... input unit, 29 ... display unit, 230 ... parameter correction availability determination unit,
231 ... Appropriate data selection unit, 232 ... Parameter identification unit,
233 ... Parameter validity determination unit.

Claims (13)

In the flocculant injection control device that controls the flocculant injection equipment of the water treatment plant,
Turbidity measuring means for measuring raw water turbidity treated in the water treatment plant;
Data storage means for accumulating the flocculant injection rate data and the raw water turbidity measurement value data measured by the turbidity measurement means as actual value data when the flocculant is injected from the flocculant injection facility,
Based on the raw water turbidity measured by the turbidity measuring means and the actual value data stored in the data storage means, an appropriate value for calculating the injection rate of the flocculant according to the appropriate value of the raw water turbidity An optimum parameter setting means for identifying a parameter;
Using the parameters set by the optimum parameter setting means, calculating means for calculating the injection rate of the flocculant,
A flocculant injection control apparatus comprising: means for controlling the injection of the flocculant from the flocculant injection facility based on the injection rate of the flocculant calculated by the calculating means. The optimum parameter setting means includes
It is determined whether or not a predetermined parameter is appropriate based on an appropriate value of the raw water turbidity, and if the determination result is inappropriate, parameter correction availability determination means for outputting a parameter correction request,
In response to a parameter correction request from the parameter correction availability determination means, appropriate data selection means for extracting the actual value data in which the raw water turbidity is not more than the appropriate value from the data storage means,
The flocculant injection control apparatus according to claim 1, further comprising parameter identification means for calculating a correction parameter based on the actual value data selected by the appropriate data selection means.   The flocculant injection control device according to claim 2, wherein the appropriate data selection means extracts the actual value data that matches a specified PH, weather, and season conditions.   In the water treatment plant, the appropriate data selection means considers the residence time of the treated water from the raw water turbidity measurement point to the turbidity measurement point at the settling basin outlet, and the actual value data is stored for the residence time. 3. The flocculant injection control device according to claim 2, wherein the actual value data moved in time is extracted. Outlet turbidity measuring means provided at the outlet of the sedimentation basin included in the water treatment plant;
Input means for inputting an appropriate value of the raw water turbidity at the outlet of the settling pond,
The data storage means stores measurement value data of the raw water turbidity at the sedimentation basin outlet measured by the outlet turbidity measurement means,
The optimum parameter setting means calculates the parameter based on the measured value data of the raw water turbidity at the settling basin outlet stored by the data storage means,
The calculation means is configured to calculate an injection rate of the flocculant based on an appropriate value of the raw water turbidity at the settling basin outlet and the parameter input by the input means. The flocculant injection control device according to any one of claims 1 and 2.   It is determined whether or not the injection amount output from the flocculant injection facility is within an allowable range based on the injection rate of the flocculant calculated by the calculation means, and when the determination result is outside the allowable range The flocculant injection control apparatus according to claim 1, further comprising upper and lower limit correction means for correcting the calculation output of the calculation means so as to be within an allowable range. Water temperature measuring means for measuring the water temperature of the raw water treated in the water treatment plant;
The water temperature correcting means for outputting a correction value for correcting the injection rate of the flocculant calculated by the calculating means based on the water temperature data measured by the water temperature measuring means. The flocculant injection control apparatus according to any one of claims 1 and 2. The optimum parameter setting means includes
The parameter is identified by using the injection rate obtained by removing the correction value output by the water temperature correction means from the injection rate of the flocculant included in the actual value data. The flocculant injection control device according to claim 7. The optimum parameter setting means includes
A parameter that determines whether the parameter that is output from the parameter identification means is appropriate, and if the forbidden result is inappropriate, the parameter that outputs the actual value data extraction request again to the appropriate data selection means Including validation means,
The said appropriate data selection means extracts the said performance value data from the said data memory | storage means on the conditions different from the last data extraction conditions, The result is output to the said parameter identification means, It is characterized by the above-mentioned. The flocculant injection control device described. The parameter validity determination means includes
And a means for outputting each parameter before and after parameter correction and the reason for determining that the parameter is inappropriate when the parameter output from the parameter identification means is inappropriate. The flocculant injection control device according to 9.   Means for displaying a relationship between the current coagulant injection rate and the measurement result of the raw water turbidity in order to determine whether the current coagulant injection rate is under-injection or over-injection based on the result of the jar test The flocculant injection control device according to any one of claims 1 to 10, characterized by comprising: The water treatment plant has a plurality of water intake systems;
The flocculant injection control device according to claim 2, wherein the appropriate data selection means selects appropriate actual value data from the data storage means based on the value of the water intake ratio of each water intake system. An input means for storing the result of the jar test in the data storage means;
The flocculant injection control according to claim 2, wherein the appropriate data selection means extracts actual value data in which the result of the jar test is valid from the data storage means, and outputs the result value data to the parameter identification means. apparatus.

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