KR100808607B1 - Method for automatic injection of coagulant in water purification plant and apparatus thereof - Google Patents

Abstract

A method and an apparatus for automatically injecting flocculant are provided to determine the flocculant injection rate suitable for the quality of raw water inputted into a purification pond, by using one of SCD(Streaming Current Detector) feedback control and table utilization. A table database is constructed by considering previous data(S10). If automatic injection of condensing agent is possible, a target flocculant injection rate is automatically determined by using one of SCD feedback control and table utilization, based on data obtained from an SCD measurer and a water quality measurer installed in a purification plant(S70,S120). The determined target flocculant injection rate is transmitted to a flocculant injector, thereby injecting flocculant into raw water according to the determined target flocculant injection rate(S80,S130). Data associated with automatic injection of flocculant are transmitted to at least one of an alarm generator, manager, and a worker terminal in a voice type or a character type(S150). Data associated with water quality factors obtained from the water quality measurer are analyzed to predict data to be received.

Description

Method for automatic injection of coagulant in water purification plant and its apparatus {Method for automatic injection of coagulant in water purification plant and apparatus

1 is a block diagram schematically showing the configuration of a flocculant automatic injection device of a water purification plant according to the present invention,

2 is a block diagram showing in detail the configuration of the operating server of FIG.

Figure 3 is a flow chart showing in detail the operation of the flocculant automatic injection method of the purification plant according to the present invention,

4 is a diagram illustrating the turbidity change for using the SCD feedback control and the drug lookup table applied to the present invention,

5 is a view showing an example of a drug lookup table applied to the present invention.

Explanation of symbols on the main parts of the drawings

100: operation server 110: control variable register

120: state detection unit 130: target injection rate determination unit

140: target injection rate transmission unit 150: alarm broadcasting transmission unit

160: prediction unit 200: flocculant injector

300: SCD 400: manager and worker terminal

The present invention relates to a coagulant autoinjection method and apparatus therefor.

More specifically, it checks whether the measuring instruments, sensors, etc. installed in the water purification plant are operating normally, and automatically determines the injection rate of flocculant suitable for the quality of raw water flowing into the water purification plant through the SCD (Streaming Current Detector) feedback control method and the use of the look-up table. It relates to a coagulant auto-injection method and a device for water purification plant to be injected.

In general, the rapid filtration process, which accounts for more than 90% of Korea in the coagulation process of water treatment plants, is continuously injecting and using coagulants, which accounts for a considerable amount of maintenance costs among the operating costs of the water purification plant.

Proper coagulant injection will have an absolute impact on water quality as well as maintenance costs. If the coagulant is excessively injected, there are problems such as an increase in chemical cost, generation of flocs with poor settleability, and excessive sludge generated in subsequent processes. If too little coagulant is injected, flocs may not be properly formed and not properly removed from the sedimentation basin, and the turbidity may be transferred to the filter, causing a strain on the filter and causing water deterioration.

Therefore, the estimation of the proper injection rate of the flocculant is the most important part in the water treatment process.

Currently, the method used for supervisory control of the flocculation process in the existing water treatment plant only performs jar-test on raw water once or twice a day, and selects flocculant injection amount accordingly.

However, since self-testing is a time-consuming task, it is almost impossible to take immediate action whenever the water quality of the raw water changes. There was a problem that can not flexibly cope with changes in the water quality occurs. In addition, even when an abnormality occurred in the flocculant injection system, it was impossible to immediately identify the abnormality.

Accordingly, in order to effectively monitor the flocculation process, foreign countries use devices such as SCD and zetameter that can be measured in real time. Currently, the method of using look-up table, SCD feedback control method, and polynomial regression method have been proposed and used in Korea. .

First, the method of using the look-up table is to extract the drug injection rate from the pre-prepared drug lookup table using water quality factors (eg, turbidity, PH, alkalinity, temperature, etc.) measured in real time as parameters. Injecting and reading the SCD response value after a certain time has elapsed. The method of injecting and reducing the injection rate of the flocculant is rapidly achieved during the high turbidity of the summer, but it is necessary to continuously correct the lookup table. There are disadvantages.

Second, the SCD feedback control method maintains the current target injection rate if the SCD value measured in real time without using the lookup table is between the predetermined upper limit value and the lower limit value, and if the SCD value exceeds or falls below the upper and lower limit values, It is a method to control the convergence between the upper and lower limits by adding or subtracting the injection rate, and it is possible to judge the proper injection of the flocculant immediately after the injection of the flocculant, the on-line control and monitoring of the flocculation process, and the change of water quality of raw water. Although the automatic injection of the flocculant is possible, there is a disadvantage in that it is not possible to quickly determine the target injection rate during instantaneous high turbidity in summer.

Third, the polynomial regression method determines the reference value (upper and lower limit value) of the SCD and adds or subtracts the injection rate when the SCD value of the raw water injected by the injection rate calculated by the following polynomial regression method exceeds or falls below the reference value. It is a way.

y = [(a ₁ · TB) + (a ₂ · Te) + (a ₃ · Al) + (a ₄ · PH) + (a ₅ · EC)] + C

y: coagulant injection rate (ppm)

TB: Turbidity (NTU)

Te: water temperature

Al: alkalinity

PH: potential hydrogen

EC: electrical conductivity

a ₁ , a ₂ , a ₃ , a ₄ , a ₅ : constant

C: intercept

However, the method using the conventional look-up table as described above, SCD feedback control method, polynomial regression method, etc., because there are disadvantages as described above, online monitoring and automatic injection of flocculant according to the climate characteristics of Korea, and real-time turbidity It is necessary to introduce a system that satisfies all of the rapid determination of instantaneous high concentration target injection rate through measurement.

An object of the present invention is to check whether the measuring instrument, sensor, etc. installed in the water purification plant is operating normally, so as to solve the above-mentioned problems, the injection rate of the coagulant suitable for the quality of the raw water flowing into the water purification plant through the SCD feedback control method and the look-up table method The present invention provides a method and apparatus for automatically injecting a flocculant in a purification plant to automatically determine and inject therein.

Another object of the present invention, if the instrument, sensor, etc. installed in the water purification plant does not operate normally, after switching to the manual mode by outputting the information about the cause to the terminal possessed by the manager and the worker, the manager and the worker manually The present invention provides a method and an apparatus for automatic injection of flocculant in a water treatment plant for quickly identifying and acting on the cause of the change.

Another object of the present invention, if the raw water turbidity is above a certain reference value, and the slope of the raw water turbidity is suddenly changed to a certain reference value or more, the injection rate of the flocculant is calculated through the method of using the look-up table and injected into the raw water, It is an object of the present invention to provide a coagulant autoinjection method and apparatus for water purification plant in which a target injection rate of coagulant is calculated through the SCD feedback control method and injected into raw water.

Another object of the present invention, by changing the flocculant target injection rate in accordance with the rapid increase in the raw water turbidity gradient, by outputting a high turbidity expected alarm, injection rate change information, etc. to the terminal possessed by the manager and worker, The present invention provides a method and apparatus for automatically injecting a flocculant in a water treatment plant to prepare for possible chemical accidents.

Another object of the present invention, when the target injection rate of the flocculant is calculated and injected into the raw water through the use of the look-up table in accordance with the rapid increase in the raw water turbidity gradient, the coagulant automatic injection of the purification plant to automatically update and manage the corresponding data A method and apparatus are provided.

Automatic coagulant injection method of water purification plant according to the present invention for achieving this object, (a) to build a lookup table as a database with reference to the past data from the operation server, the upper limit value, the lower limit value, decrement value, lookup table injection reference value, lookup table injection The step of inputting the slope and the combination of these parameters from the manager or worker of the water purification plant, and (b) the coagulant through the flocculant injector by checking the normal operation state of the SCD meter, water quality meter, coagulant injector installed in the water purification plant in the operation server If the automatic injection of the flocculant through the flocculant injector is determined, and the (c) step (b) determines whether the automatic injection is possible, input from the SCD meter and the water quality meter installed in the water purification plant in the operation server Injection of flocculant targets using either SCD feedback control method or lookup table based on data Determining the determination method automatically, determining the target injection rate of the flocculant to be injected into the raw water according to the determined SCD feedback control method or using the look-up table, and (d) the flocculant target injection rate determined in step (c) described above Changing the coagulant target injection rate during the step of injecting the coagulant into the raw water by transferring to the feeder, and (e) changing the coagulant target injection rate during the steps (a) to (d) Sending an alarm broadcast in the form of voice or text to any one or more of an alarm generator or a manager or worker's terminal so that a manager or worker can recognize information, data related to the moving average slope of a water purification plant, and data related to the coagulant auto-injection combining them. And (f) turbidity, PH, temperature, alkalinity of the water purification plant received from the water quality measuring instrument of the water purification plant, Analyzing the data according to a predetermined period to calculate the moving average gradient, characterized in that it comprises the step of predicting the data to be received in the future.

And, the step (b) described above, (b1) receiving the status information from the state detection sensor of the SCD measuring instrument in the operating server and determining whether or not the SCD measuring instrument is in a normal operation, (b2) the operating server Receiving water turbidity, PH, temperature, alkalinity, and water quality meter status information including a combination thereof to determine whether the water quality meter is capable of normal operation; and (b3) a coagulant injector from the state sensor at the operation server. Determining whether or not the coagulant injector is in a normal operation state by receiving the state information of (b4) In the above (b1) step, the SCD meter is in a state in which normal operation is not possible, or (b2) If the water quality meter is in a state where normal operation is not possible in the step, or the state of the coagulant injector is normal in step (b3). If one or more of these conditions are not met, the current coagulant injection mode is changed from the automatic operation mode to the manual operation mode to indicate that the automatic operation mode release alarm signal and the released cause information are displayed. It is preferable to configure to perform the alarm broadcast in the form of voice or text to the terminal or worker terminal.

In addition, the method of automatically determining the coagulant target injection rate of the above-mentioned step (c), the raw turbidity value exceeds the reference table injection reference value input in the step (b) and the moving average slope of the raw turbidity is ( b) In case of rising or falling to a value larger than the tilt table input slope input in step b), the flocculant target injection rate is determined by using the look-up table. Otherwise, the flocculant target injection rate is determined by the SCD feedback control method. It is preferable.

In the method of automatically determining the coagulant target injection rate in the above-mentioned step (c), the SCD feedback control method uses the coagulant target injection rate when the SCD value is less than the lower limit value input in step (b). If the SCD value is greater than the lower limit value or lower limit value and less than the upper limit value or upper limit value, the flocculant target injection rate is maintained at the 'current injection rate', and the SCD value exceeds the upper limit value input in step (b). In this case, it is preferable to configure the coagulant target injection rate to determine the 'current injection rate-decrease value'.

In the method of automatically determining the coagulant target injection rate in the above-mentioned step (c), the method of using the look-up table includes turbidity, PH, temperature, alkalinity, and a combination of water quality factors received from the water quality measuring instrument installed in the water well of the water purification plant. The target injection rate of the coagulant corresponding to the coagulant is extracted from the look-up table input in step (a) and determined and injected, and the coagulant target injection rate is adjusted so that the current SCD value is larger than the lower limit or the lower limit and smaller than the upper limit or the upper limit. Preferably, the adjustment table is configured to correct the look-up table with the injected coagulant target injection rate when the current SCD value is larger than the lower limit or the lower limit and smaller than the upper limit or the upper limit.

In addition, when the coagulant target injection rate determined in step (d) above is not normally transmitted to the coagulant injector, or when the coagulant injector fails to normal injection according to the received target injection rate, the current injection mode is manually operated in the automatic operation mode. It is preferable to configure the automatic release alarm signal and the release cause information to inform the alarm generator, the administrator terminal or the worker terminal in the form of voice or text to the operation mode and switch to the manual operation mode.

In addition, the alarm generator or the manager so that the manager or worker always recognizes the current injection rate of the coagulant currently injected in step (e), the current raw water quality status and change trend, the current purified water quality status and change trend, and a combination thereof. And it is preferable to configure to transmit the alarm broadcast in the form of voice or text to any one or more of the worker terminal.

And among the predicted data calculated by analyzing the data received from the water quality meter of the water purification plant of step (f) mentioned above, the raw water turbidity prediction alarm, the purified water turbidity prediction alarm, and a combination thereof that need to be recognized by the manager or worker It is preferable that the predictive data of one water quality factor is configured to transmit an alarm broadcast in the form of voice or text to at least one of an alarm generator, a manager, and a worker terminal.

In addition, the coagulant automatic injection device of the water purification plant according to the present invention, by building the lookup table as a database with reference to the past data from the operation server, the upper limit value, the lower limit value, the subtraction value, the lookup table injection reference value, the lookup table injection slope and a combination of these parameters The control variable register that performs the function of receiving the input from the manager or worker of the water purification plant, and the operation server checks the normal operation status of the SCD measuring instrument, water quality measuring instrument, and coagulant injector installed in the water purification plant to check whether the coagulant automatic injection is possible through the coagulant injector. If the state detection unit performing the function of judging whether the state detection unit and the coagulant automatic injection through the coagulant injector is possible, based on the data input from the SCD meter and the water quality meter installed in the water purification plant in the operation server How to use SCD feedback control or lookup table The target injection rate determination unit which automatically determines the method of determining the coagulant target injection rate and determines the target injection rate of the coagulant to be injected into the raw water according to the determined SCD feedback control method or the use of the look-up table, and the target injection rate determination A target injection rate transmission unit which transfers the coagulant target injection rate determined by the Ministry to a coagulant injector to inject coagulant into raw water, change information when the coagulant target injection rate is changed, change information when the coagulant target injection rate determination method is changed, This function transmits alarm broadcasting in the form of voice or text to any one or more of an alarm generator or a manager or worker's terminal so that a manager or worker can recognize data related to the moving average slope of a water purification plant and the data related to the coagulant auto-injection. Clean water received from alarm broadcast sending part to say and water quality measuring instrument of water purification plant It is characterized in that it comprises a predictor for analyzing the turbidity, pH, temperature, alkalinity of the intestine and water quality factor data combining them according to a predetermined period to calculate the moving average gradient and then predict the data to be received in the future.

In addition, the above-described state detection unit receives the state information from the state detection sensor of the SCD measuring device and determines whether the SCD measuring device is in a normal operation, turbidity, PH, temperature, alkalinity of the water purification plant and a combination thereof Receiving water quality meter status information to determine whether the water quality meter is in a normal operation state, and receiving the status information of the flocculant injector from the state detection sensor to determine whether the coagulant injector is capable of normal operation If the SCD meter is in a state where normal operation is not possible, the water meter is in a state where normal operation is not possible, or the coagulant injector is in a state where normal operation is not possible. If one or more of the following conditions exist, the current coagulant injection mode The automatic operation mode release alarm signal and the released cause information indicating the change to the manual operation mode by switching to the manual operation mode from the alarm broadcast transmitter to the alarm generator or administrator terminal or worker terminal in the form of voice or text broadcast It is desirable to.

And, the target injection rate determination unit, the raw turbidity value exceeds the look-up table injection reference value input from the control variable register and the moving average slope of raw turbidity rises to a value larger than the look-up table injection slope input from the control variable register. In case of descending, it is preferable to configure the target concentration of flocculant by using the look-up table. Otherwise, it is preferable to configure the target concentration of flocculant by the SCD feedback control method.

And, the SCD feedback control method determined by the target injection rate determination unit described above, if the SCD value is less than the lower limit value input from the control variable register, the flocculant target injection rate is determined as the 'current injection rate + deceleration value', SCD value If this value is higher than the lower limit or lower limit and less than the upper limit or upper limit, the flocculant target injection rate is maintained at the 'current injection rate'. If the SCD value exceeds the upper limit input from the control variable register, the flocculant target injection rate is set to 'current It is preferable to configure so as to determine the injection rate-decrease value.

In addition, the method of using the look-up table determined by the target injection rate determination unit described above includes a target injection rate of a coagulant corresponding to turbidity, PH, temperature, alkalinity, and water quality factor values thereof, which are received from a water quality measuring instrument installed in a water well of a water purification plant. Is extracted from the look-up table inputted from the control variable register and determined and injected, and adjusts the value of the coagulant target injection rate so that the current SCD value is greater than the lower limit or the lower limit and less than the upper limit or the upper limit, similar to the SCD feedback control method. It is preferable that the adjustment is made to correct the look-up table with the injected coagulant target injection rate when the current SCD value is larger than the lower limit or the lower limit and less than the upper limit or the upper limit as a result of the adjustment.

In addition, the target injection rate transmission unit described above, when the coagulant target injection rate determined by the target injection rate determination unit is not normally transmitted to the coagulant injector, or when the coagulant injector does not normal injection in accordance with the target injection rate received, the current injection The mode is changed from the automatic operation mode to the manual operation mode, and the automatic operation release alarm signal and the canceled cause information indicating that the mode has been switched to the manual operation mode are transmitted to the alarm generator, the administrator terminal, or the worker terminal in the form of voice or text. It is preferable to configure to broadcast an alert.

In addition, the above-mentioned alarm broadcasting transmitting unit periodically alerts the administrator or worker to recognize the current injection rate of the coagulant currently injected, the current raw water quality state and change trend, the current purified water quality state and change trend, and a combination thereof. (B) It is preferable to configure an alarm broadcast in the form of voice or text to any one or more of the administrator and the worker terminal.

In addition, the predictor described above, the raw water turbidity predicted alarm, the purified water turbidity predicted alarm, and a combination of these water quality predictions that the worker or the worker need to recognize among the predicted data calculated by analyzing the data received from the water quality measuring instrument of the water purification plant The predictive data of the factor is preferably configured to transmit the alarm broadcast in the form of voice or text to any one or more of the alarm generator, the administrator and the worker terminal through the alarm broadcast transmitter.

Hereinafter, with reference to the accompanying drawings will be described in detail the flocculating agent automatic injection method and apparatus of the water purification plant of the present invention.

First, prior to the detailed description of the present invention will be described in detail the main terms used in the present invention.

The parameter used in the present invention includes an upper limit value, a lower limit value, a decrement value, a lookup table injection reference value, a lookup table inclination, etc., which are input in advance and registered from a worker working at a water purification plant, a manager working at a control center, or the like.

The upper limit value is a parameter used to determine the coagulant target injection rate by the SCD feedback control method.If the average value of the SCD value measured is large, the coagulant autoinjection system determines the coagulant target injection rate as 'current injection rate-decrement value'. Boundary value.

The lower limit value is a parameter used to determine the flocculant target injection rate by the SCD feedback control method.If the average value of the currently measured SCD value is smaller than the value input as the lower limit value, the coagulant auto-injection system sets the flocculant target injection rate to 'current injection rate +'. It is a boundary value determined by 'decrement value'.

The acceleration / decrease value is a parameter used in determining the flocculant target injection rate by the SCD feedback control method, and is a value that the flocculant autoinjection system is used as a reference when the flocculant target injection rate is added or decreased.

The reference table injection reference value and the reference table injection slope are the standard values that convert the method of determining the coagulant target injection rate from the coagulant auto-injection system from the SCD feedback control method to the use of the look-up table.In the coagulant auto-injection system, the raw water turbidity value exceeds the reference table injection standard value. Only when the moving average slope of raw turbidity rises or falls above the table injection slope value, the coagulant target injection rate is determined by using the table.

1 is a block diagram schematically showing the configuration of a flocculant automatic injection device of a water purification plant according to the present invention.

As shown, the coagulant auto-injection apparatus of the present invention includes an operation server 100, a coagulant injector 200, an SCD 300, a manager and a worker terminal 400, and the like.

The operation server 100 constructs a lookup table that summarizes the relationship between the basic water quality factors and the coagulant injection rate by referring to the past data (data for two or three years from the present), and is installed in the water purification plant. Data input from each instrument and sensors (e.g. water level meter, inflow flow meter, outlet flow meter, intake pump, water pump, pressurization pump, pump condition sensor, check valve sensor, discharge valve sensor, etc.) Leading water quality factor of raw water on the basis, and high turbidity predicted alarm signal when the slope of raw water turbidity exceeds the preset value (i.e., the degree of turbidity rapidly increases or decreases) based on the raw water quality factor of raw water. After generating and transmitting to the manager and worker terminal 400 to alert the occurrence of high turbidity, based on the lookup table established in the database to determine the target injection rate of the flocculant It controls the input of the coagulant through the coagulant injector 200, and fine-tuning according to the coagulation state of the raw water based on the data input from the SCD 300 after a predetermined time (for example, 5 minutes) (that is, injection of the coagulant) Adjustment to increase or decrease the rate.

In addition, if the slope of the raw water turbidity does not exceed a preset value (that is, the degree of turbidity gradually increases or decreases), the operation server 100 does not use the look-up table as described above and according to the SCD feedback control. The target injection rate of the coagulant is determined to control the coagulation of the coagulant through the coagulant injector 200, and the fine adjustment according to the coagulation state of the raw water is controlled based on the data input from the SCD 300 after a predetermined time.

At this time, the basic water quality factor of the raw water described above is data including turbidity, alkalinity, PH, and water temperature.

In addition, the operation server 100 described above, after controlling the coagulant injection according to the target injection rate determined based on the look-up table when high turbidity occurs, the coagulant injection rate is made according to the coagulation state of the raw water based on the data input from the SCD (300) Correct the lookup table by further updating the tweaking data.

In addition, the operation server 100 described above, if the normal operation is not possible on the basis of the operation state information input from each of the measuring instruments and sensors, the reason for the manual switching to the manual operation mode after switching to the manual operation mode Information is transmitted to the manager and worker terminal 400 by voice and / or text, and automatically completed when an action completion signal is input from the manager and worker terminal 400 that has completed the action for the reason for manual conversion based on the information. Switch to mode.

The coagulant injector 200 inputs a corresponding amount of coagulant into the raw water based on the target injection rate or the fine adjustment data input from the operation server 100.

SCD (300) is installed in front of the flocculating paper, and through the coagulant injector 200 obtains information on the coagulation state of the raw water moved from the mixed paper to which the flocculant is put and transmits to the operation server (100).

The manager and worker terminal 400 is provided with a high turbidity predictive alarm signal from the operation server 100 in voice and / or text so that the manager or worker immediately check the current situation.

FIG. 2 is a block diagram illustrating in detail the configuration of the operation server 100 of FIG. 1.

As shown, the operation server 100 is a control variable register 110, state detection unit 120, target injection rate determination unit 130, target injection rate transmission unit 140, alarm broadcast transmitter 150 , The prediction unit 160, and the like.

The control variable registration unit 110 constructs a lookup table as a database by referring to the historical data in the operation server 100, and sets the upper limit value, the lower limit value, the decrement value, the lookup table injection reference value, the lookup table injection slope, and a combination of these parameters in the water treatment plant manager. Or performs a function to receive input from the worker.

The state detecting unit 120 checks the normal operation state of each measuring instrument, sensor, and coagulant injector installed in the water purification plant in the operation server 100 to determine whether the coagulant autoinjection through the coagulant injector is possible. .

In addition, the state detection unit 120 receives the state information from the state detection sensor of the SCD measuring unit 300 and determines whether the SCD measuring unit 300 is in a state in which normal operation is possible, and the turbidity and PH of the water purification plant. , The temperature, alkalinity, and the water quality measuring instrument status information combinations thereof to determine whether or not the water quality measuring instrument is a normal operation, and receives the state information of the coagulant injector 200 from the state sensor, the coagulant injector ( 200 is further performed to determine whether or not the normal operation is possible, the SCD measuring instrument 300 is a state in which normal operation is not possible, or when the water quality instrument is in a state in which normal operation is not possible or , When the coagulant injector 200 corresponds to any one or more of the states in which normal operation is not possible, the current coagulant injector After the mode is changed from the automatic operation mode to the manual operation mode, the alarm generator, the manager and the worker are provided through the alarm broadcasting transmitter 150 for information such as the automatic operation mode release alarm signal and the cause of the release. Alert broadcast to the terminal 400 in the form of voice or text.

If the target injection rate determination unit 130 is a state in which the coagulant auto-injection through the coagulant injector is possible as a result of the determination of the state detection unit 120, the data input from each measuring instrument and sensor installed in the water purification plant in the operation server 100 Based on this, the method of determining the coagulant target injection rate is automatically determined based on the SCD feedback control method or the look-up table method, and the target coagulant injection rate to be injected into the raw water is determined according to the determined SCD feedback control method or the look-up table method. .

Then, the target injection rate determination unit 130, the look-up table received the raw average turbidity value exceeds the reference table injection reference value input from the control variable registration unit 110 and the moving average gradient of the raw turbidity is input from the control variable registration unit 110 In the case of rising or falling to a value larger than the inclination slope, the flocculant target injection rate is determined by using the look-up table. Otherwise, the flocculant target injection rate is determined by the SCD feedback control method.

In the SCD feedback control method determined by the target injection rate determination unit 130, when the SCD value is less than the lower limit value input from the control variable register, the target coagulant injection rate is determined as 'current injection rate + deceleration value', and the SCD. If the value is higher than the lower limit or the lower limit and less than the upper limit or the upper limit, the coagulant target injection rate is maintained at the 'current injection rate'. If the SCD value exceeds the upper limit input from the control variable register, the coagulant target injection rate is set to ' Current injection rate-decrement value.

In addition, the look-up table using method determined by the target injection rate determination unit 130, the target injection of the coagulant corresponding to the turbidity, PH, temperature, alkalinity and the water quality factor value of the combination of the turbidity received from the water quality measuring instrument installed in the water well of the water purification plant The rate of the coagulant injection rate is determined by extracting the rate from the look-up table input by the control variable register 110 and determining the current SCD value to be greater than the lower limit or the lower limit and smaller than the upper limit or the upper limit, as in the SCD feedback control method. And adjust the look-up table with the injected coagulant target injection rate when the current SCD value is greater than the lower limit or the lower limit and less than the upper limit or the upper limit as a result of the adjustment.

The target injection rate transmission unit 140 transmits the coagulant target injection rate determined by the target injection rate determination unit 130 to the coagulant injector 200 to perform a function of injecting a coagulant into the raw water.

And, the target injection rate transmission unit 140, the target injection rate of the flocculant target injection rate determined by the target injection rate determination unit 130 is not normally transmitted to the coagulant injector 200, or the target injection rate received by the coagulant injector 200 If the normal injection is not possible, the current injection mode is changed from the automatic operation mode to the manual operation mode, and then the alarm broadcast transmitting unit (information such as the automatic operation release alarm signal and the release cause indicating that the operation mode has been switched to the manual operation mode) 150 through the alarm generator or manager and the worker terminal 400 to broadcast the alarm in the form of voice or text.

The alarm broadcasting transmitting unit 150 changes the information when the coagulant target injection rate is changed, the change information when the coagulant target injection rate determination method is changed, the moving average slope of the water quality factor of the water purification plant, and the data related to the coagulant auto-injection by combining them. It performs the function of transmitting the alarm broadcast in the form of voice or text to any one or more of the alarm generator or administrator and the worker terminal 400 to recognize.

Then, the alarm broadcast transmitting unit 150, the alarm generator so that the manager or worker always recognizes the current injection rate of the coagulant currently injected, the current raw water quality and change trend, the current purified water quality and change trend, and a combination thereof (B) transmits an alarm broadcast in the form of voice or text to any one or more of the manager and worker terminal 400.

The prediction unit 160 analyzes the turbidity, PH, temperature, alkalinity, and water quality factor data of the water purification plant received at the water purification plant according to a predetermined period, calculates a moving average slope, and then predicts data to be received in the future. To perform.

The prediction unit 160 analyzes the data received from the water quality measuring instrument of the water purification plant, and calculates the raw water turbidity predicted alarm, the purified water turbidity predicted alarm, and a combination thereof, which are required to be recognized by the worker or the worker. The alarm broadcast transmitter 150 transmits the alarm data in the form of voice or text to any one or more of the alarm generator, the manager, and the worker terminal 400 through the alarm broadcast transmitter 150.

Next, an embodiment of the coagulant automatic injection method of the purification plant according to the present invention configured as described above will be described in detail with reference to FIGS.

Figure 3 is a flow chart showing in detail the operation of the flocculant automatic injection method of the purification plant according to the present invention, Figure 4 is a diagram illustrating the turbidity change for the use of SCD feedback control and look-up table applied to the present invention, Figure 5 is Figure 1 shows an example of a lookup table applied to the present invention.

First, referring to the historical data for two or three years on the basis of the present time, the operation server 100 constructs a drug lookup table that summarizes the relationship between the infusion rate of the basic water quality factor and the coagulant (S10). )

After building the lookup table as a database, the operation server 100 checks the operation state of each measuring instrument and sensors installed in the water purification plant to determine whether the normal coagulation operation is possible (S20).

As a result of determination, if each of the measuring instruments and sensors installed in the water purification plant operates normally, the operation server 100 based on the data input from each measuring instrument and sensors installed in the water purification plant (turbidity, alkalinity, PH, water temperature) Etc.) are read (S30).

Then, it is determined whether the gradient of raw water turbidity exceeds a preset look-ahead gradient value based on the read basic water quality factor (S40). In other words, it is determined whether the degree of turbidity increases or decreases rapidly (see Fig. 4).

As a result of the determination, when the slope of raw turbidity exceeds a preset lookup table inclination value, the operation server 100 applies the lookup table using a high turbidity predicted alarm signal to the manager and worker terminal 400 by voice and / or text. It is transmitted (S50), it is determined whether the raw water turbidity value exceeds the preset lookup table injection reference value (S60).

As a result of the determination, if the raw water turbidity value exceeds the preset reference table injection reference value, the target injection rate of the flocculant is determined according to the method of using the lookup table with reference to the query table constructed as a database (S70), and the determined target injection rate is determined by the coagulant injector (200). ) To be added to the raw water to the flocculant according to the injection rate (S80).

Then, the operation server 100 determines whether the current SCD value is appropriate by identifying the aggregation state based on the data input from the SCD 300 (that is, whether the current SCD value is greater than the lower limit or the lower limit, and is smaller than the upper limit or the upper limit). Determination (S90), and if the current SCD value is not appropriate, an adjustment is made to increase or decrease the target injection rate (S100), and then the current SCD value is greater than the lower limit value or the lower limit value, and the upper limit value or the upper limit value is adjusted. When it becomes smaller and updated to the injected flocculant target injection rate to correct the lookup table (S110).

On the other hand, when the determination result of step S40 described above does not exceed the preset gradient table inclination value, or if the raw water turbidity value is less than the preset reference table injection reference value, the operation server ( In 100), after determining the target injection rate of the flocculant by applying the SCD feedback control method (S120), the determined target injection rate is provided to the flocculant injector 200 to inject the flocculant into the raw water (S130).

On the other hand, if the normal operation is not possible as a result of the determination of step S20 of determining whether the normal operation of the coagulant automatic injection is possible, the operation server 100 to release the automatic operation mode to switch to the manual operation mode (S140) ), The information on the reason for the manual conversion is transmitted to the manager and worker terminal 400 in the form of voice and / or text so that the immediate action can be performed (S150).

In addition, it is determined whether the action completion signal is input from the manager 400 and the worker terminal 400 that have completed the action for the reason of manual switching (that is, whether the action for restarting the autonomous driving mode is completed) to switch to the autonomous driving mode. (S160).

As described above, according to the coagulant automatic injection method and apparatus of the present invention, the target injection rate of the coagulant is calculated and injected into the raw water through the SCD feedback control method and the look-up table using the raw water turbidity gradient. On-line monitoring and automatic injection, as well as real-time measurement of turbidity, help to quickly determine instantaneous high turbidity target injection rates.

In addition, if the measuring instrument, sensor, etc. installed in the water purification plant does not operate normally or the slope of raw water turbidity increases rapidly, the manager and worker are manually switched because the alarm signal is provided to the terminal possessed by the manager and worker. It is possible to quickly identify and take measures, as well as to prepare for drug accidents that may occur when information on the injection rate changes due to high turbidity.

In addition, when the feed rate of flocculant is calculated and injected into raw water according to the rapid increase of the raw water turbidity gradient, since the changed injection rate information is automatically updated and managed, the continuous management of the lookup table is effective. have.

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

Claims (16)

(a) constructing a look-up table into a database by referring to historical data in the operation server, and receiving input of an upper limit value, a lower limit value, a decrement value, a look-up table injection reference value, a look-up table inclination, and a combination thereof from a manager or worker of a water treatment plant; (b) determining whether the automatic coagulant injection through the coagulant injector is possible by checking the normal operation state of the SCD measuring instrument, the water quality measuring instrument, and the coagulant injector installed in the water purification plant in the operation server; (c) If the determination result of step (b) indicates that the coagulant auto-injection is possible through the coagulant injector, using the SCD feedback control method or the lookup table based on the data input from the SCD meter and the water quality meter installed in the water purification plant in the operation server. Automatically determining a coagulant target injection rate determination method of one of the methods, and determining a coagulant target injection rate to be injected into the raw water according to the determined SCD feedback control method or a look-up table use method; (d) transferring the coagulant target injection rate determined in step (c) to a coagulant injector to inject coagulant into raw water; (e) Change information when changing the coagulant target injection rate, change information when changing the coagulant target injection rate determination method, the moving average slope of the water treatment plant water quality factor in the process of performing steps (a) to (d) and the coagulant combining them Transmitting an alarm broadcast in the form of voice or text to any one or more of an alarm generator or a manager and a worker terminal so that a manager or worker recognizes data related to automatic injection; And (f) analyzing the turbidity, PH, temperature, alkalinity, and combination of water quality factors data received from the water quality meter of the water purification plant according to a predetermined period to calculate a moving average slope, and then predict the data to be received in the future. Coagulant automatic injection method of water purification plant comprising a. According to claim 1, wherein the step (b) described above, (b1) receiving the state information from the state detection sensor of the SCD measuring instrument in the operation server and determining whether the SCD measuring instrument is in a normal operation state; (b2) receiving the turbidity, PH, temperature, alkalinity, and a combination of water quality meter status information of the water purification plant from the operation server to determine whether the water quality meter is in a normal operation state; (b3) receiving the state information of the coagulant injector from the state sensor in the operation server and determining whether the coagulant injector is in a normal operation state; And (b4) when the SCD meter is in a state where normal operation is not possible in step (b1), or when the water quality meter is in a state where normal operation is not possible in step (b2), or (b3) If the state of the coagulant injector is at least one of the normal operation state is not possible to switch the current coagulant injection mode from the automatic operation mode to the manual operation mode to release the automatic operation mode indicating that the switch to the manual operation mode A method for automatically injecting a flocculant in a water purification plant, comprising: alarming the alarm signal and released cause information to an alarm generator, a manager terminal, or a worker terminal in the form of voice or text. The method of claim 1, wherein the method of automatically determining the coagulant target injection rate in the step (c), If the raw turbidity value exceeds the look-up table injection criterion input in step (b) and the moving average slope of the raw turbidity increases or decreases to a value larger than the look-up table injection slope input in step (b), use the look-up table. Method to determine flocculant target injection rate, Otherwise, the flocculant automatic injection method of the purification plant, characterized in that the flocculant target injection rate is determined by the SCD feedback control method. According to claim 1, SCD feedback control method of the method of automatically determining the flocculant target injection rate of the step (c), When the SCD value is less than the lower limit value input in step (b), the flocculant target injection rate is determined as 'current injection rate + decrement value'. If the SCD value is higher than the lower limit or lower limit and less than the upper limit or upper limit, the flocculant target injection rate is maintained at the 'current injection rate'. When the SCD value exceeds the upper limit value input in step (b), the flocculant target injection rate is determined as 'current injection rate-decrease value', characterized in that the flocculent automatic injection method of water purification plant. According to claim 1, Method of using the lookup table of the method of automatically determining the flocculant target injection rate of step (c), The turbidity, PH, temperature, alkalinity received from the water quality meter installed in the water purification plant of the water purification plant and the target injection rate of the coagulant corresponding to the water quality factor combination thereof are extracted from the lookup table input in step (a), and then injected. , Adjust the value of the flocculant target injection rate so that the current SCD value is greater than the lower limit or the lower limit and less than the upper limit or the upper limit. A coagulation agent automatic injection method for a purification plant, characterized in that the look-up table is corrected by the injected coagulant target injection rate when the current SCD value is larger than the lower limit value or the lower limit value and smaller than the upper limit value or the upper limit value. The method of claim 1, wherein the coagulant injection rate determined in step (d) is not normally transmitted to the coagulant injector, or when the coagulant injector cannot be injected normally according to the target injection rate. The current injection mode is changed from the automatic operation mode to the manual operation mode, and the automatic operation release alarm signal and the released cause information indicating that the mode has been switched to the manual operation mode are broadcasted in the form of voice or text to the alarm generator, administrator terminal, or worker terminal. Automatic injection method of flocculant in the water purification plant, characterized in that. The method of claim 1, wherein the manager or worker is always alerted to the current injection rate of the flocculant currently injected in step (e), the current raw water quality status and change trend, the current purified water quality status and change trend, and a combination thereof. An automatic coagulant injection method for a water purification plant, characterized by transmitting an alarm broadcast in the form of voice or text to at least one of a generator, a manager, and a worker terminal. According to claim 1, the raw water turbidity predicted alarm, purified water turbidity predicted alarm that the worker or worker needs to be aware of the predicted data calculated by analyzing the data received from the water quality meter of the water purification plant in step (f). And an alarm broadcast in the form of voice or text to at least one of an alarm generator, a manager, and a worker terminal. Controls to build a lookup table as a database by referring to the historical data on the operation server, and receive the upper limit value, the lower limit value, the decrement value, the lookup table injection reference value, the lookup table inclination, and a combination of these parameters from the manager or worker of the water treatment plant. Variable register; A state sensing unit that checks the normal operation state of the SCD measuring instrument, the water quality measuring instrument, and the coagulant injector installed in the water purification plant to determine whether the coagulant automatic injection through the coagulant injector is possible; If the state detection unit judges that the coagulant auto-injection through the coagulant injector is possible, the coagulant of the SCD feedback control method or the method of using the look-up table based on the data input from the SCD meter and the water quality meter installed in the water purification plant in the operation server. A target injection rate determination unit for automatically determining a target injection rate determination method and determining a target injection rate of a flocculant to be injected into raw water according to the determined SCD feedback control method or a look-up table using method; A target injection rate transmission unit for transmitting a flocculant target injection rate determined by the target injection rate determination unit to a coagulant injector to inject coagulant into raw water; Change information when changing the coagulant target injection rate, change information when changing the coagulant target injection rate determination method, alarm generator or manager and worker to recognize the data related to the moving average slope of water quality factor of water purification plant An alarm broadcasting transmitter for transmitting an alarm broadcasting in the form of voice or text to any one or more of the terminals; And Prediction that analyzes turbidity, PH, temperature, alkalinity, and water quality factor data of the water treatment plant received from the water purification equipment of the water treatment plant according to the set period to calculate moving average slope, and then predict the data to be received in the future. Coagulant automatic injection device of a water purification plant, characterized in that it comprises a portion. The method of claim 9, wherein the state detection unit, Receiving status information from the state detection sensor of the SCD meter and determining whether the SCD meter is in a normal operation state; Receiving water turbidity, PH, temperature, alkalinity of the water purification plant, and water quality meter state information including a combination thereof to determine whether the water quality meter is in a normal operation state; And receiving the state information of the coagulant injector from the state detection sensor and determining whether the coagulant injector is in a state in which normal operation is possible. At least one of when the SCD meter is in a state where normal operation is not possible, when the water quality meter is in a state where normal operation is not possible, or when the state of the coagulant injector is in a state where normal operation is not possible. If applicable, the current coagulant injection mode is changed from the automatic operation mode to the manual operation mode, and the automatic operation mode release alarm signal indicating that the mode has been switched to the manual operation mode and the cause information released through the alarm broadcaster, the alarm generator or the manager terminal or worker The coagulant automatic injection device of the water purification plant characterized in that the alarm broadcast in the form of voice or text to the terminal. The method of claim 9, wherein the target injection rate determination unit, If the raw turbidity value exceeds the look-up table injection criterion input from the control variable register and the moving average slope of the raw turbidity rises or falls to a value larger than the look-up table injection slope input from the control variable register, the method of using the look-up table is used. The flocculant target injection rate is determined, otherwise the flocculant automatic injection device of the purification plant characterized in that the flocculant target injection rate is determined by the SCD feedback control method. 10. The method of claim 9, wherein the SCD feedback control method determined by the target injection rate determination unit, If the SCD value is less than the lower limit value input from the control variable register, the coagulant target injection rate is determined as 'current injection rate + decrement value'. If the SCD value is higher than the lower limit or lower limit and less than the upper limit or upper limit, the flocculant target injection rate is maintained at the 'current injection rate'. When the SCD value exceeds the upper limit input from the control variable register, the flocculant target injection rate is determined as the 'current injection rate-decrease value', characterized in that the flocculant automatic injection device of the purification plant. The method of claim 9, wherein the lookup table using method determined by the target injection rate determining unit is as follows. The turbidity, PH, temperature, alkalinity received from the water quality measuring instrument installed in the water purification plant of the water purification plant, and the target injection rate of the coagulant corresponding to the water quality factor value combining them are extracted from the look-up table input from the control variable register, and then injected. As in the SCD feedback control method, the value of the coagulant target injection rate is adjusted so that the current SCD value is larger than the lower limit or the lower limit and smaller than the upper limit or the upper limit. A coagulant autoinjection apparatus for a water purification plant, characterized in that the table is corrected by the injected coagulant target injection rate when the current SCD value is larger than the lower limit value or the lower limit value and smaller than the upper limit value or the upper limit value. The method of claim 9, wherein the target injection rate transmission unit, If the coagulant target injection rate determined by the target injection rate determination unit is not normally transmitted to the coagulant injector, or the coagulant injector does not perform normal injection according to the received target injection rate, the current injection mode is changed from the automatic operation mode to the manual operation mode. To switch to the automatic operation mode alarm signal indicating that the switch to the manual operation mode and the release cause information through the alarm broadcast transmitting unit to the alarm generator or administrator terminal or worker terminal in the form of voice or text alarm broadcast Coagulant automatic injection device of water purification plant. The method of claim 9, wherein the alarm broadcast transmitting unit, At least one of the alarm generator or manager and worker terminal periodically so that the manager or worker is always aware of the current injection rate of the coagulant being injected, the current raw water quality and change trend, the current water quality and change trend, and a combination thereof Automatic coagulant injection device of a water purification plant characterized in that the alarm broadcast in the form of voice or text. The method of claim 9, wherein the prediction unit, Among the predicted data calculated by analyzing the data received from the water quality measuring instrument of the water treatment plant, the alarm of raw water turbidity expected alarm, purified water turbidity predicted alarm which need to be recognized by the manager or worker, and the predicted data of the combined water quality factor are alerted. A coagulant automatic injection device for a water purification plant, characterized in that for sending out the alarm broadcast in the form of voice or text to any one or more of the alarm generator, manager and worker terminal through the broadcast transmission unit.

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