JP4817782B2 - Sewage treatment system - Google Patents

Description

  The present invention relates to a combined sewer system that treats sewage, rainwater, and the like, and more particularly, to a sewage treatment system that optimizes the amount of disinfectant injected not only in good weather but also in rainy weather.

  In the combined sewer system, the injection amount of the disinfectant is adjusted so that the treated water such as sewage and rainwater is determined, for example, the number of coliform bacteria contained in the treated water is less than 3000 / mL. is doing.

At this time, increasing the amount of the disinfectant injected increases the disinfecting effect and reduces the number of coliforms in the treated water. However, if more disinfectant is injected, the unreacted disinfectant is treated together with the treated water. There is a risk of being discharged and adversely affecting the discharged water system. For this reason, the inflow amount of the disinfectant must be an amount necessary and sufficient for the treated water to satisfy the predetermined conditions.
JP-A-2005-131583

  By the way, in such a combined sewer system, the flow rate of rainwater flowing into the confluence pipe in rainy weather is much higher than the flow rate of sewage flowing in clear weather, and the water quality is poor. There was a problem that it was difficult to optimize the injection amount.

  Therefore, as a method for solving such problems, the organic matter concentration in the treated water is measured at the pump station on the site side, and based on the measurement result and the contact time in which the disinfectant and the treated water are mixed, There has been proposed a method of automatically adjusting the injection amount by calculating the injection amount of the disinfectant in the pump station control device (Patent Document 1).

  In addition, as another problem-solving method, the measurement results of radar rain gauges, ground rain gauges, etc. located in various places are transmitted to the pump station control device to predict changes in the flow rate of treated water, changes in pollution load, etc. A method for automatically adjusting the injection amount by determining the injection amount of the disinfectant has also been proposed.

  However, in these problem-solving methods, a high-performance and expensive pumping station control device must be arranged for each site.

  In addition, since the flow rate of treated water varies from site to site depending on the situation of the sewage pipes, the surrounding terrain, and how it rains, the programs installed in each pump station control device are optimized for each site. There is a problem that it must be expensive.

  In view of the above circumstances, the present invention can finely adjust the amount of disinfectant injection corresponding to the situation of the sewage pipes, the surrounding terrain, how to rain, etc., and optimally optimize the number of coliforms, the amount of residual chlorine, etc. It aims at providing the sewage treatment system which can be converted into a sewage.

In order to achieve the above object, the present invention takes in sewage and rainwater and stores the treated water as treated water while measuring the inflow amount of the sewage and rainwater and the water level of the stored treated water, A pump station that generates measurement value data as process data, and a disinfection device that inputs disinfectant injection amount setting value data as control data and injects disinfectant into the treated water based on the input disinfectant injection amount setting value data The discharge flow rate setting value data and the water flow rate setting value data are input as control data, the discharge pump for discharging treated water after disinfection to the river based on the input discharge flow rate setting value data, and the input water flow rate setting value data said process data and the water pump, and sewage treatment facilities equipped with, generated by the sewage treatment facility for water treated water after disinfection to the sewer pipe based on This is a means to calculate multiple disinfectant injection amount setting values, and is suitable for reducing the disinfectant injection amount setting value suitable for reducing the coliform of treated water and the remaining disinfectant amount of treated water. A disinfectant injection amount set value and one or more disinfectant injection amount set values between these disinfectant injection amount set values, and a disinfectant injection amount calculator Based on the disinfectant injection amount setting value selected by the operator from among the plurality of disinfectant injection amount setting values obtained in Step 1, the disinfectant injection amount setting value data is generated, and the discharge flow rate setting value data and Generating water amount set value data, supplying the disinfectant injection amount set value data, the discharge flow rate set value data and the water supply amount set value data to the sewage treatment facility as control data to inject disinfectant into the disinfecting device, Said discharge port Is characterized by comprising a control means for causing the water supply process for effluent treatment and the water pump for the flop, the.

  According to the present invention, it is possible to reduce the cost of the pumping station control device provided on each site side, to keep the equipment cost of the entire system low, and to set a plurality of disinfectant injection amount set values obtained by simulation calculation By selecting the optimal disinfectant injection amount setting value for the operator who knows the situation in detail from among the, in response to the situation of the sewer pipe, the surrounding terrain, how to rain, The amount of disinfectant injection can be finely adjusted, and the number of coliforms and the amount of residual chlorine can be optimized.

<< First Embodiment >>
FIG. 1 is a block diagram showing a first embodiment of a sewage treatment system according to the present invention.

  The sewage treatment system 1 shown in this figure takes in sewage, rainwater, etc., stores it as treated water, measures the inflow amount, the water level, etc., generates process data, and stores the treated water in the sewage pipe. 10 is a process for sending water to 10 and a process for injecting a disinfectant into a river 13 and the like, and a process for fetching process data output from the sewage treatment equipment 2 and sending it to a designated location. The pump station control device 3 that presents the received data to the operator and supplies the sewage treatment facility 2 with a disinfectant injection amount instruction, a discharge flow instruction, a water supply instruction, etc., according to the selection contents of the operator, The process data transmitted from the pump station control device 3 through the communication line 5 such as a telephone line or a dedicated line is taken in, and a plurality of disinfectant injection amounts are obtained based on the process data. Calculating a value, and a service center device 4 to be transmitted such as pumping station control apparatus 3 through the communication line 5.

  Then, the sewage treatment facility 2 side measures the inflow amount and water level of sewage, rainwater, etc., generates process data, and becomes the sewage treatment facility 2 → the pump station control device 3 → the communication line 5 → the service center device 4. The process data is supplied to the service center apparatus 4 through the route. Further, after calculating a plurality of disinfectant injection amount setting values, a plurality of disinfectant injection amount settings are supplied to the pump station control device 3 through the route of the service center device 4 → the communication line 5 → the pump station control device 3. And display. Further, based on the disinfectant injection amount setting selected by the operator, the discharge flow rate instruction set value set by the operator, the water supply amount instruction set value, etc., the disinfectant injection amount instruction and the discharge flow rate instruction from the pump station controller 3 , A water supply amount instruction is output, and a part of the treated water stored in the pump station 8 of the sewage treatment facility 2 is supplied to the sewage pipe 10, and a disinfectant is injected at a specified injection rate, and the river 13 To be released.

  The sewage treatment facility 2 takes in the rainwater collected by the rainwater trough 7 and the sewage discharged from each household through the sewage pipe 6, and measures the inflow and the water level while storing it as treated water. A pump station 8 that outputs process data, a water pump 9 that takes in treated water stored in the pump station 8 and discharges the treated water stored in the pump station 8 based on a water supply amount instruction from the pump station controller 3, and pump station control Based on the discharge flow instruction from the apparatus, the treated water stored in the pump station 8 is taken and discharged into the river 13, the disinfectant is stored, and the disinfectant injection amount instruction from the pump station control apparatus 3 And a disinfecting device 12 for disinfecting treated water discharged into the river 13 by discharging a disinfectant.

  Then, while processing water such as sewage and rainwater is taken in and stored in the pump station 8, the inflow amount of the processing water flowing into the pump station 8, the water level of the pump station 8 and the like are measured to generate process data. Is supplied to the pump station controller 3. Further, based on the water supply amount instruction from the pump station control device 3, the water supply pump 9 is operated to take in the treated water stored in the pump station 8 and supply it to the sewer pipe 10. Further, based on the discharge flow instruction and the disinfectant injection amount instruction from the pump station control device 3, the discharge pump 11 is operated, the treated water stored in the pump station 8 is taken in, and the amount designated from the disinfection device 12 Only after the disinfectant is discharged and injected into the treated water, it is discharged into the river 13.

  Further, the pump station control device 3 takes in process data output from the sewage treatment facility 2 and supplies it to the service center device 4 via the communication line 5. In addition, a plurality of disinfectant injection amount setting values transmitted from the service center device 4 via the communication line 5 are captured and presented to the operator. Then, based on one disinfectant injection amount setting selected by the operator, a discharge flow rate instruction set value set by the operator, a water supply amount instruction set value, etc., a disinfectant injection amount instruction, a discharge flow rate instruction, a water supply amount instruction Is output to control the sewage treatment facility 2.

  In addition, the service center device 4 captures process data transmitted from the pumping station control device 3 via the communication line 5 and performs a simulation calculation based on the process data to set a plurality of disinfectant injection amounts. A value is generated and transmitted to the pump station controller 4 via the communication line 5.

  At this time, as shown in FIG. 2, in general disinfection, when the amount of chlorine injected as a disinfectant increases, the coliform group displayed in logarithmic form decreases linearly, and for a while from the beginning. The residual chlorine increases at "0 mg / L" and then increases linearly.

  Here, if the number of coliforms in the disinfected sewage is regulated to “b1” and the amount of residual chlorine is regulated to “a1”, the reference value “b1” of these coliforms, the reference value of residual chlorine Corresponding to “a1”, the chlorine injection amounts are “b2” and “a2”, respectively.

  When these chlorine injection amounts “b2” and “a2” are, for example, “b2> a2”, the appropriate chlorine injection amount differs depending on which of the coliform group and the residual chlorine amount is important. A plurality of chlorine injection amount setting values are calculated between the chlorine injection amounts “b2” to “a2”. When these chlorine injection amount setting values are selected, the number of coliforms, the difference value indicating how far the residual chlorine amount is from the reference value, and whether these difference values exceed a predetermined threshold A warning message or the like is created and displayed on the pump station control device 3. The operator selects the optimal chlorine injection amount setting value depending on whether the number of coliforms or the amount of residual chlorine is important.

  As described above, in the first embodiment, each process data obtained by the measurement operation of the sewage treatment facility 2 is serviced by a route of the sewage treatment facility 2 → the pump station control device 3 → the communication line 5 → the service center device 4. After supplying to the center device 4 and calculating a plurality of disinfectant injection amount set values, a plurality of disinfectants are supplied to the pump station control device 3 through the route of the service center device 4 → the communication line 5 → the pump station control device 3. Supply and display the agent injection amount setting, let the operator select one disinfectant injection amount setting, and specify the injection rate specified for a part of the treated water pumped from the pump station 8 of the sewage treatment facility 2 In this way, a disinfectant is injected and discharged into the river 13. For this reason, it is possible to reduce the cost of the pump station control device 3 provided on each site side, and to keep the equipment cost of the entire system low. Operators who have a detailed understanding of the situation at the site can finely adjust the amount of disinfectant injected according to the situation of the sewer pipe 6, the surrounding terrain, and how it rains. The amount of residual chlorine can be optimized.

  Further, in the first embodiment, the service center device 4 uses the service center device 4 to set the disinfectant injection amount setting value suitable for reducing the coliform of treated water and the disinfectant suitable for reducing the remaining disinfectant amount of treated water. The agent injection amount set value and one or more disinfectant injection amount set values between these disinfectant injection amount set values are calculated and displayed to the operator of the pump station control device 3. . Therefore, within the range from the disinfectant injection amount setting value suitable for reducing the amount of residual disinfectant in the treated water to the disinfectant injection amount setting value suitable for reducing the coliform of treated water, the operator Can select the optimum disinfectant injection amount setting value, and can optimize the number of coliforms, residual chlorine amount, etc.

<< Second Embodiment >>
FIG. 3 is a block diagram showing a second embodiment of the sewage treatment system according to the present invention.

  A sewage treatment system 21 shown in this figure takes in data transmitted from a radar rain gauge 22, a ground rain gauge 23, and the like arranged at each location via a communication line 24 such as a telephone line or a dedicated line, and rains. Service center device 24 that performs volume prediction, inflow rate prediction, inflow water quality prediction, disinfectant injection amount calculation, and supplies to the pump station side via a communication line 25 such as a telephone line or a dedicated line, and process data on the site side A pump station that captures and displays and presents each data received via the communication line 25 to the operator, and generates a disinfectant injection amount instruction, a discharge amount instruction, a water supply amount instruction, etc. according to the selection contents of the operator The control device 26 and the treated water such as sewage and rainwater are taken in, the inflow amount and the water level are measured, the process data is generated, and supplied to the pump station control device 26. Based on the disinfectant injection amount instruction, the discharge flow instruction, the water supply amount instruction, etc. from the device 26, a process of supplying a part of the treated water to the sewer pipe 32, a process of injecting the disinfectant and discharging it to the river 34, etc. A sewage treatment facility 27 is provided.

  The service center device 24 captures data transmitted from the radar rain gauge 22 and the ground rain gauge 23 arranged at each location via a communication line 24 such as a telephone line and a dedicated line, Applying a preset calculation formula, simulation calculation formula, etc., to generate a precipitation prediction value, an inflow prediction value, an inflow water quality prediction value, a plurality of disinfectant injection amount setting values, a telephone line, The data is transmitted to the pump station control device 26 via a communication line 25 such as a dedicated line.

  At this time, if the number of coliforms in the sterilized sewage is regulated to “b1” and the amount of residual chlorine is regulated to “a1”, the reference value “b1” of these coliforms, the reference value of residual chlorine Corresponding to “a1”, the chlorine injection amounts are “b2” and “a2”, respectively. When these chlorine injection amounts “b2” and “a2” are, for example, “b2> a2”, the appropriate chlorine injection amount varies depending on whether the number of coliforms or the residual chlorine amount is important. When calculating a plurality of chlorine injection amount setting values between the chlorine injection amounts “b2” to “a2”, and selecting each of these chlorine injection amount setting values, the number of coliforms and the residual chlorine amount are A difference value indicating how far from the reference value, a warning message indicating whether or not each of these difference values exceeds a predetermined threshold value, and the like are generated and displayed on the pump station control device 26.

  The pumping station control device 26 takes in process data output from the sewage treatment facility 27, displays the inflow amount and water level of the treated water flowing into the sewage treatment facility 27, and the service center device via the communication line 25. 24, the predicted rainfall amount, the inflow flow rate prediction value, the inflow water quality prediction value, and a plurality of the disinfectant injection amount setting values transmitted from 24 are taken in, and as shown in FIG. One predicted disinfectant injection amount set by the operator, set by the operator while displaying the predicted flow rate, predicted influent water quality, and multiple disinfectant injection amount setting values and recognizing to the operator Based on the discharge flow rate instruction set value, the water supply amount instruction set value, etc., the sewage treatment facility 27 is controlled by outputting the disinfectant injection amount instruction, the discharge flow rate instruction, and the water supply amount instruction.

  The sewage treatment facility 27 takes in the rainwater collected by the rainwater 29 and sewage discharged from each household through the sewage pipe 28, and measures the inflow amount and the water level while storing it as treated water, A pumping station 30 that outputs data, a water supply pump 31 that takes in treated water stored in the pumping station 30 based on a water supply amount instruction from the pumping station control device 26, and supplies the treated water to the sewer pipe 32, and a pumping station control device 26, a discharge pump 33 that takes in treated water stored in the pumping station 30 and discharges it to the river 34, stores a disinfectant, and instructs the injection amount of the disinfectant from the pumping station controller 26. And a disinfecting device 35 for disinfecting treated water discharged to the river 34 by discharging a disinfectant.

  Then, sewage and rainwater are taken in and stored in the pump station 30 as treated water, while the amount of inflow of sewage and rainwater flowing into the pump station 30 and the water level of the pump station 30 are measured to generate process data This is supplied to the pump station controller 26. In addition, based on the water supply amount instruction from the pump station control device 26, the water supply pump 31 is operated, the treated water stored in the pump station 30 is taken in, and is supplied to the sewer pipe 32. Also, based on the discharge flow instruction and the disinfectant injection amount instruction from the pump station control device 26, the discharge pump 33 is operated, and the treatment water stored in the pump station 30 is taken in, and designated by the disinfection device 35. The disinfectant is discharged in an amount, poured into the treated water, disinfected, and then discharged into the river 34.

  As described above, in the second embodiment, the service center device 24 uses the data transmitted from the radar rain gauge 22, the ground rain gauge 23, and the like arranged at each location to calculate the rainfall forecast calculation, the inflow flow rate. A prediction calculation, an inflow water quality prediction calculation, a plurality of disinfectant injection amount calculations, and the like are performed, and a rainfall amount prediction value, an inflow flow rate prediction value, an inflow water quality prediction value, a plurality of values are displayed on the display of the pump station control device 26. The disinfectant injection amount set value of the pump station control device 26 is displayed based on the disinfectant injection amount setting selected by the operator, the discharge flow rate instruction set value set by the operator, the water supply amount instruction set value, and the like. Outputs a disinfectant injection amount instruction, a discharge flow rate instruction, and a water supply amount instruction to control the sewage treatment facility 27 to send water to the sewage pipe 32 and to perform sterilization processing and the like to discharge it to the river 34. There. For this reason, it is possible to reduce the cost of the pump station control device provided at each site side, and to keep the cost of the entire system low. Further, the measurement results of the radar rain gauges 22 arranged in various places or the ground rain gauge 23 Using the measurement results, calculate the rainfall forecast value, inflow flow forecast value, inflow water quality forecast value, and multiple disinfectant injection amount set values, and present these to the operator for detailed situation of the site. The operator who knows can select the optimal disinfectant injection amount setting value. This makes it possible to finely adjust the amount of disinfectant injected in accordance with the situation of the sewage pipe 28, the surrounding terrain, how it rains, etc., and to optimize the number of coliforms, the amount of residual chlorine, etc. .

  In the second embodiment, the service center device 24 uses the service center device 24 to set a disinfectant injection amount setting value suitable for reducing the coliform of treated water and a disinfectant suitable for reducing the amount of residual disinfectant in the treated water. The agent injection amount set value and one or more disinfectant injection amount set values between these disinfectant injection amount set values are calculated and displayed to the operator of the pump station control device 26. . Therefore, within the range from the disinfectant injection amount setting value suitable for reducing the amount of residual disinfectant in the treated water to the disinfectant injection amount setting value suitable for reducing the coliform of treated water, the operator The optimal disinfectant injection amount set value can be selected to optimize the number of coliforms, residual chlorine amount, and the like.

  Further, in the second embodiment, when the disinfectant is injected into the treated water at each disinfectant injection amount setting value by the service center device 24, the number of remaining coliforms and the amount of the disinfectant remaining in the treated water are calculated. Is displayed on the pump station controller 26. For this reason, when determining the optimal disinfectant injection amount setting value for the operator, it is easier to grasp the number of remaining coliforms and the amount of residual disinfectant in the treated water and optimize the number of coliforms and the amount of residual chlorine. can do.

  In the second embodiment, the service center device 24 calculates the number of remaining coliforms and the amount of residual disinfectant when the disinfectant is injected into the treated water at each disinfectant injection amount setting value, and is set in advance. The difference between the number of reference residual coliforms and the amount of reference residual disinfectant is calculated, and when each of these differences exceeds a preset threshold, a warning message is generated and the pump station The information is displayed on the control device 26. For this reason, when the number of remaining coliforms when the disinfectant is injected into treated water at each disinfectant injection amount setting value and the residual disinfectant amount is within the warning range, a warning message is sent to the operator, The number, the amount of residual chlorine, etc. can be optimized.

  In the second embodiment, the service center device 24 predicts the rainfall amount, the inflow rate, and the inflow water quality, and based on these prediction results, the pump station control device 26 predicts the rainfall amount in the trend format and the inflow rate. A predicted value, a predicted value of influent water quality, and a disinfectant injection amount setting value are displayed. For this reason, let the operator know the change in the amount of rainwater flowing into the pump station 30 after several tens of minutes to several hours, and select the optimal disinfectant injection amount setting value, The amount of chlorine can be optimized.

1 is a block diagram showing a first embodiment of a sewage treatment system according to the present invention. FIG. 2 is a schematic diagram for explaining an example of a disinfectant injection amount set value calculation operation of the service center apparatus shown in FIG. 1. The block diagram which shows 2nd Embodiment of the sewage treatment system by this invention. The schematic diagram which shows the data display example of the pump station control apparatus shown in FIG.

Explanation of symbols

1, 2: Sewage treatment system 2, 27: Sewage treatment facility 3, 26: Pump station control device 4: Service center device 5, 24, 25: Communication line 6, 10, 28, 32: Sewage pipe 7, 29: Rainwater 8, 30: Pump station 9, 31: Water pump 11, 33: Discharge pump 12, 35: Disinfection device 13, 34: River 22: Radar rain gauge 23: Ground rain gauge

Claims (5)

A pumping station that takes in sewage and rainwater and stores it as treated water, measures the inflow amount of the sewage and rainwater, and the water level of the stored treated water, and generates inflow amount measurement value data and water level measurement value data as process data; The disinfectant injection amount setting value data is input as control data, and the disinfection device for injecting the disinfectant into the treated water based on the input disinfectant injection amount setting value data, the discharge flow rate setting value data and the water supply amount setting value Input data as control data, discharge pump to discharge treated water to the river based on the input discharge flow set value data, and treated water after disinfection to the sewer pipe based on the input water supply amount set value data A sewage treatment facility comprising a water pump for feeding water ,
A means for calculating a plurality of disinfectant injection amount setting values based on the process data generated by the sewage treatment facility, and a disinfectant injection amount setting value suitable for reducing coliforms of treated water, and processing Disinfectant injection suitable for reducing the amount of residual disinfectant in water and disinfectant injection for calculating one or more disinfectant injection amount set values between these disinfectant injection amount set values. A quantity calculation means;
Based on the disinfectant injection amount setting value selected by the operator from the plurality of disinfectant injection amount setting values obtained by the disinfectant injection amount calculation means , and generating disinfectant injection amount setting value data, Discharge flow rate set value data and water supply amount set value data are generated, and the disinfectant injection amount set value data, discharge flow rate set value data and water supply amount set value data are supplied as control data to the sewage treatment facility, and the disinfection device A control means for performing a disinfectant injection process, a discharge process for the discharge pump, and a water supply process for the water pump;
A sewage treatment system comprising: The sewage treatment system according to claim 1,
The disinfectant injection amount calculation means is
Based on rainfall data obtained by radar rain gauges or ground rain gauges installed at each location, predicting and calculating rainfall, inflow flow rate and inflow water quality flowing into the pump station, multiple disinfectant injections A sewage treatment system characterized by calculating an amount set value . The sewage treatment system according to claim 1 or 2,
When the disinfectant injection amount calculation means injects disinfectant into treated water at each disinfectant injection amount setting value, the disinfectant injection amount calculation means calculates the number of remaining coliform bacteria and the amount of residual disinfectant in the treated water, and A sewage treatment system, characterized in that it is displayed on a display means provided . The sewage treatment system according to claim 1 or 2,
The disinfectant injection amount calculating means calculates the number of remaining coliforms and the amount of residual disinfectant in the treated water when injecting the disinfectant into the treated water at each disinfectant injection amount setting value, and a preset reference The difference between the number of remaining coliforms and the amount of the reference residual disinfectant is calculated, and when each difference exceeds a preset threshold value, a warning message is generated and provided in the pump station control device. A sewage treatment system characterized by being displayed on a display means . The sewage treatment system according to claim 1 or 2,
The disinfectant injection amount calculation means predicts rainfall, inflow rate, inflow water quality, calculates a plurality of disinfectant injection amount setting values, and predicts rainfall amount, inflow rate prediction value, inflow water quality in a trend format. A sewage treatment system , wherein a predicted value and a disinfectant injection amount set value are displayed on a display means provided in the pump station control device .

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