JP2006274577A - Water quality predicting device and water quality control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water quality predicting device capable of accurately predicting the water quality of sewage flowing into an upstream sewerage facility by considering the deviation between a water quality predicted value and a water quality measured value of sewage flowing into a downstream sewerage facility even when a measuring part cannot be provided in the upstream sewerage facility, and to provide a water quality control device for controlling the water quality of sewage utilizing the predicted value of water quality measured by the water quality predicting device. <P>SOLUTION: The water quality predicting device 10 comprises a first water quality predicting part 12 for predicting the water quality of sewage flowing into the upstream sewerage facility, and a second water quality predicting part 22 for predicting the water quality of sewage flowing into the downstream sewerage facility. A correcting part 25 computes a water quality correction value based on the deviation between the water quality predicted value and the water quality measured value in the downstream sewerage facility. The first water quality predicting part 12 corrects the water quality predicted value of sewage flowing into the upstream sewerage facility, predicted by the first water quality predicting part 12, with the water quality correction value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water quality prediction apparatus for predicting the quality of sewage in an upstream sewage system in a sewage system including a sewage system such as a pumping station, a sewage treatment plant, a rainwater storage facility, and a natural spout, and the water quality prediction apparatus. The present invention relates to a water quality control apparatus that controls the quality of sewage using predicted values of measured water quality.

In general, for example, in sewer systems such as combined sewers, BOD (biochemical oxygen demand), SS (floating substances), coliforms, etc. in water discharged into public water areas such as rivers, lakes, and seas when raining Contaminants have a negative impact on the water environment of public water. In particular, the pre-treatment effluent discharged from the pump facility and natural outlet (upstream sewage facility) provided upstream of the sewage treatment facility (downstream sewage facility) in the sewage system is not treated. There is a problem that the pollutant contained in the pre-treatment effluent water has a high concentration.
As a water quality control device for a sewer system that reduces the concentration of such pollutants by measuring the quality of treated sewage such as inflow sewage, for example, the one shown in Patent Document 1 is known.

A conventional water quality control device for a sewer system will be described in detail with reference to FIG.
As shown in FIG. 6, for example, a sewage system including a sewage treatment facility includes a pump facility (upstream sewage facility) 2 and a sewage treatment facility (downstream) provided on the downstream side of the pump facility 2 via a connection line 8. Side sewer equipment) 3. The combined sewage 1 flows into the pump facility 2 from an inflow line 7, and a sewage discharge pump 5 that discharges sewage from the pump facility 2 to public water such as a river is provided. The sewage in the pump facility 2 drawn out by the sewage discharge pump 5 flows out from the pump facility outflow line 9b as pre-treatment discharge water 6 and is finally sent to public water. The sewage discharge pump 5 is connected to a sewage discharge pump control device 14 that controls the sewage discharge pump 5. On the other hand, the treated discharged water 4 subjected to the sewage treatment in the sewage treatment facility 3 flows out from the sewage treatment facility outflow line 9a.

JP 2000-107744 A

  However, in the conventional sewer system as shown in FIG. 6, it is difficult to install a water quality measuring device such as a turbidimeter in the pump facility 2 because the water depth of the pump facility (upstream sewer facility) 2 is deep. It is. In addition, when a measuring device is installed in the pump facility 2, the inflow sewage to be measured by this measuring device has not yet been treated by the sewage treatment facility (downstream sewer facility) 3. There is a problem that the measurement accuracy is deteriorated due to adhesion of dirt on the measuring instrument.

  Therefore, for example, as shown in FIG. 6, a water quality prediction device 80 having an inflow water quality prediction unit 82 is connected to the sewage discharge pump control device 14, and the inflow water quality prediction unit 82 is connected to the pump facility 2 input by the operator. A method for predicting the inflow water quality prediction value of the pump facility 2 based on the inflow amount prediction value 81 (or the rainfall intensity prediction value) is considered. However, even with such a method, there is a large error between the predicted value of the influent water quality by the influent water quality prediction unit 82 and the actual influent water quality, and this error is even greater especially when the operating state of the sewer system changes. There's a problem.

The present invention has been made in consideration of such points, and even if it is not possible to provide a measurement unit for measuring the quality of sewage in the upstream sewage system, it flows into the downstream sewage system. It is an object of the present invention to provide a water quality predicting apparatus that can accurately predict the quality of sewage flowing into an upstream sewer facility by taking into account the deviation between the predicted sewage quality and the measured water quality.
Another object of the present invention is to provide a water quality control device that can accurately control the quality of sewage water by using the predicted value of the quality of sewage water predicted by such a water quality prediction device. .

The present invention provides a water quality prediction apparatus used in a sewer system having an upstream sewer facility and a downstream sewer facility provided in series, and is provided on the inlet side of the downstream sewer facility and flows into the downstream sewer facility. The measurement unit that measures the quality of sewage and the predicted inflow or precipitation intensity of the upstream sewage equipment are input from the outside, and the estimated inflow quality of the upstream sewage equipment is predicted based on these predictions. The second water quality predicts the inflow water quality prediction value of the downstream sewer system based on these prediction values, and the inflow amount prediction value or the rainfall intensity prediction value of the downstream sewer facility from the outside. Connected to the prediction unit, the second water quality prediction unit and the measurement unit, the measured value measured by the measurement unit, and the downstream sewerage facility sent from the second water quality prediction unit A deviation calculation unit that calculates a deviation from the predicted water quality and a deviation calculation unit that is connected to the deviation calculation unit, calculates a water quality correction value based on the deviation calculated by the deviation calculation unit, and uses the water quality correction value as the first correction value. A correction unit for sending to the water quality prediction unit, and in the first water quality prediction unit, the first water quality prediction unit predicted by the first water quality prediction unit based on the water quality correction value sent from the correction unit. It is a water quality prediction apparatus characterized by further correcting the inflow water quality prediction value.
According to such a water quality prediction apparatus, even if it is not possible to provide a measurement unit for measuring the quality of sewage in the upstream sewerage facility, the predicted value of water quality and the measurement of water quality flowing into the downstream sewerage facility. By considering the deviation from the value, the quality of the sewage flowing into the upstream sewerage facility can be predicted with high accuracy.

The present invention is used in a sewage system including the above-described water quality prediction device, and a sewage discharge pump for discharging sewage from the upstream side sewage facility to public water, and a sewage discharge pump control device for controlling the sewage discharge pump. And the inflow water quality prediction value of the upstream sewer system corrected by the first water quality prediction unit of the water quality prediction device is sent to the sewage discharge pump control device, and the sewage discharge pump control device It is a water quality control apparatus characterized by controlling the said sewage discharge pump based on the inflow water quality prediction value of the corrected upstream sewer installation sent from the apparatus.
According to such a water quality control device, the sewage discharge pump control device is configured so that the inflow to the upstream side sewerage facility is estimated in consideration of the deviation between the predicted water quality value and the measured water quality value flowing into the downstream side sewerage facility. Since the predicted quality of sewage is used, it is possible to control the sewage discharge pump more accurately in accordance with the actual operation of the sewage system, and discharge the desired amount of sewage from the upstream sewage system to public water. Therefore, the quality of the sewage can be controlled with high accuracy.

The present invention is used in a sewer system including the above-described water quality prediction device, and further includes a chemical injection pump for injecting chemical into the upstream side sewer facility, and a chemical injection pump control device for controlling the chemical injection pump. The inflow water quality prediction value of the upstream sewer system corrected in the first water quality prediction unit of the water quality prediction device is sent to the chemical injection pump control device, and the chemical injection pump control device sends it from the water quality prediction device. The chemical injection pump is controlled based on the corrected inflow water quality predicted value of the corrected upstream-side sewerage facility.
According to such a water quality control device, the chemical injection pump control device is configured so that the inflow to the upstream sewerage facility is estimated in consideration of the deviation between the predicted water quality value and the measured water quality value flowing into the downstream sewerage facility. Since the predicted value of sewage water quality is used, it is possible to control the chemical injection pump more accurately in accordance with the actual operation of the sewer system, and to inject a desired amount of chemical into the upstream sewage system. Therefore, the quality of the sewage can be controlled with high accuracy.

The present invention is used in a sewer system equipped with the above-described water quality prediction device, and a sewage discharge pump for discharging sewage from the upstream sewage facility to public water, and a screen provided on the downstream side of the sewage discharge pump; And a screen cleaning device for cleaning the screen, and a screen cleaning control device for controlling the screen cleaning device, the inflow water quality prediction of the upstream sewer system corrected in the first water quality prediction unit of the water quality prediction device A value is sent to the screen cleaning control device, and the screen cleaning control device controls the screen cleaning device based on the corrected inflow water quality predicted value of the upstream sewerage facility sent from the water quality prediction device. Is a water quality control device characterized by
According to such a water quality control device, the screen cleaning control device is configured to provide the inflow sewage to the upstream side sewerage facility, which is estimated in consideration of the deviation between the predicted water quality value and the measured water quality value flowing into the downstream sewerage facility. Therefore, it is possible to control the screen cleaner more accurately in accordance with the actual operation of the sewer system.For example, when the predicted water quality is high after correction, Cleaning can be performed in advance or the screen can be cleaned during rain, so that the filtration performance of the screen can be improved, and therefore the quality of sewage can be controlled with high accuracy. .

The present invention is used in a sewer system including the above-described water quality prediction device, and is provided with a storage facility that is branched from between the upstream side sewer facility and the downstream side sewer facility, and a storage facility from the upstream side sewer facility. The inflow water quality prediction value of the upstream sewerage facility is corrected by the first water quality prediction unit of the water quality prediction device, and includes an inflow gate for adjusting the inflow of sewage to the water and an inflow gate control device for controlling the inflow gate. Is sent to the inflow gate control device, and the inflow gate control device controls the inflow gate based on the corrected inflow water quality predicted value of the upstream sewer system sent from the water quality prediction device. This is a water quality control device.
According to such a water quality control device, the inflow gate control device has the inflow sewage to the upstream sewage system estimated in consideration of the deviation between the predicted value of the sewage water flowing into the downstream sewage system and the measured water quality. Therefore, the inflow gate can be controlled in accordance with the actual operation of the sewer system, and the flow rate of the sewage flowing from the upstream sewer system to the storage facility can be adjusted to a desired amount. Therefore, the quality of the sewage can be controlled with high accuracy.

The present invention is used in a sewer system including the above-described water quality prediction device, and is provided with a storage facility that is branched from between the upstream sewer facility and the downstream sewer facility, and the downstream sewer from the storage facility. A return pump for returning the sewage to the facility, and a return pump control device for controlling the return pump, and the inflow water quality prediction value of the upstream sewer facility corrected in the first water quality prediction unit of the water quality prediction device is The return pump control device controls the return pump based on the corrected inflow water quality predicted value of the upstream-side sewer facility sent from the water quality prediction device. It is a water quality control device.
According to such a water quality control device, the return pump control device is configured such that the inflow sewage to the upstream sewerage facility is estimated in consideration of the deviation between the predicted water quality value and the measured water quality value flowing into the downstream sewerage facility. Therefore, the return pump can be controlled in accordance with the actual operation of the sewer system, and the flow rate of the sewage returned from the storage facility to the downstream sewer facility can be adjusted to a desired amount. Therefore, the quality of the sewage can be controlled with high accuracy.

According to the water quality prediction apparatus of the present invention, the water quality prediction apparatus includes a second water quality prediction unit that predicts the quality of sewage flowing into the downstream sewerage facility, and is based on the deviation between the water quality prediction value and the water quality measurement value in the downstream sewerage facility. The water quality correction value is calculated, and the water quality prediction value of the inflow sewage to the upstream sewer system predicted by the first water quality prediction unit is corrected by the water quality correction value. For this reason, even if it is not possible to provide a measurement unit for measuring the quality of sewage in the upstream sewage system, take into account the deviation between the predicted water quality and the measured value of the sewage flowing into the downstream sewage system. This makes it possible to accurately predict the quality of sewage flowing into the upstream sewage system.
Further, according to the water quality control device of the present invention, the quality of sewage can be controlled with high accuracy by using the predicted value of the quality of sewage predicted by such a water quality prediction device.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram showing a configuration of a water quality prediction apparatus and a water quality control apparatus according to the present embodiment.

First, the sewer system of this embodiment will be described.
The sewage system in the present embodiment includes a pump facility (upstream sewage facility) 2 and a sewage treatment facility (downstream sewage facility) 3 provided on the downstream side of the pump facility 2 via a connection line 8. ing. The combined sewage 1 flows into the pump facility 2 from an inflow line 7, and a sewage discharge pump 5 that discharges sewage from the pump facility 2 to public water such as a river is provided. The sewage in the pump facility 2 drawn out from the sewage discharge pump 5 flows out from the pump facility outflow line 9b as pre-treatment discharge water 6 and is finally sent to public water. The sewage discharge pump 5 is connected to a sewage discharge pump control device 14 that controls the sewage discharge pump 5. Here, the sewage discharge pump 5 and the sewage discharge pump control device 14 constitute a water quality control device.
On the other hand, the treated discharged water 4 subjected to the sewage treatment in the sewage treatment facility 3 flows out from the sewage treatment facility outflow line 9a. A turbidity meter (measuring unit) 20 for measuring the turbidity of incoming sewage is installed in, for example, the first sedimentation basin on the inlet side of the sewage treatment facility 3.
In this embodiment, the pump facility 2 is used as the upstream sewage system and the sewage treatment facility 3 is used as the downstream sewage system in the sewage system. It is not limited to the above, and any combination of pump equipment, sewage treatment equipment, rainwater storage equipment, natural outlet, etc. can be used. The side sewerage facility may be a sewage treatment facility.

  As shown in FIG. 1, the sewer system includes a water quality prediction device 10 that predicts the turbidity (water quality) of the sewage flowing into the pump facility 2. As shown in FIG. 1, the water quality prediction apparatus 10 includes the turbidity meter 20 described above, a first water quality prediction unit 12 that predicts turbidity of inflow sewage from the pump facility 2, and inflow sewage from the sewage treatment facility 3. A second water quality prediction unit 22 that predicts the turbidity of the water, a deviation calculation unit 24 connected to the second water quality prediction unit 22 and the turbidimeter 20, a deviation calculation unit 24, and the first water quality prediction unit 12 And a connected correction unit 25.

  The first water quality predicting unit 12 is configured such that, for example, an operator inputs an inflow predicted value 11 (or a rainfall intensity predicted value) of the combined sewage 1 to the pump facility 2, and the inflow predicted value 11 ( Alternatively, the turbidity of the inflow sewage of the pump facility 2 is predicted based on the rainfall intensity prediction value). The first water quality prediction unit 12 further corrects the predicted value of the turbidity of the inflowing sewage predicted by the above-described method using a turbidity correction value sent from the correction unit 25 described later. The predicted value of the turbidity of the incoming sewage is sent to the sewage discharge pump controller 14.

  The second water quality prediction unit 22 is configured such that, for example, an operator inputs a predicted sewage inflow amount 21 (or a predicted rainfall intensity value) to the sewage treatment facility 3, and this inflow predicted value 21 (or The turbidity of the inflow sewage of the sewage treatment facility 3 is predicted based on the rainfall intensity prediction value).

  The deviation calculation unit 24 receives the predicted value of the turbidity of the inflowing sewage from the sewage treatment facility 3 from the second water quality prediction unit 22 and the measured turbidity value measured by the turbidimeter 20. The turbidity measurement value is subtracted from the turbidity prediction value described above.

  The correction unit 25 is configured so that the difference between the turbidity predicted value and the turbidity measured value of the inflow sewage from the sewage treatment facility 3 is sent from the deviation calculating unit 24. The turbidity correction value is calculated based on the value of the difference from the value.

Next, the operation of the present embodiment having such a configuration will be described.
In the water quality prediction device 10, for example, an operator inputs an inflow predicted value 11 (or rainfall intensity predicted value) of the combined sewage 1 flowing into the pump facility 2 into the first water quality prediction unit 12, and this first water quality prediction unit. 12 predicts the turbidity of the inflow sewage of the pump facility 2 based on the input inflow prediction value 11 (or rainfall intensity prediction value).
In addition, for example, an operator inputs an inflow predicted value 21 (or a rainfall intensity predicted value) of sewage flowing into the sewage treatment facility 3 into the second water quality prediction unit 22, and the second water quality prediction unit 22 is input. The turbidity of the inflow sewage of the sewage treatment facility 3 is predicted based on the inflow amount prediction value 21 (or the rainfall intensity prediction value).

  On the other hand, the turbidity meter 20 measures the turbidity of the incoming sewage, for example, in the first sedimentation basin on the inlet side of the sewage treatment facility 3. The turbidity predicted value of the inflowing sewage of the sewage treatment facility 3 predicted by the second water quality prediction unit 22 and the turbidity measurement value measured by the turbidimeter 20 are sent to the deviation calculation unit 24, respectively.

  In the deviation calculation unit 24, the difference value is calculated by subtracting the measured turbidity value from the predicted turbidity value of the sewage flowing into the sewage treatment facility 3. The correction unit 25 calculates a turbidity correction value based on the difference value.

  The turbidity correction value calculated by the correction unit 25 is sent to the first water quality prediction unit 12. In the first water quality prediction unit 12, the turbidity correction value sent from the correction unit 25 further corrects the turbidity prediction value of the inflow sewage of the pump facility 2 described above. The corrected predicted turbidity value is sent to the sewage discharge pump controller 14.

  The sewage discharge pump control device 14 controls the sewage discharge pump 5 based on the corrected turbidity predicted value calculated by the first water quality prediction unit 12 to adjust the flow rate of sewage discharged to public water.

  As described above, according to the water quality prediction device 10 of the present embodiment, the water quality prediction device 10 predicts the turbidity (water quality) of sewage flowing into the sewage treatment facility (downstream sewerage facility) 3. A water quality prediction unit 22 is provided, and a turbidity correction value (water quality correction value) is calculated based on a deviation between a turbidity prediction value (water quality prediction value) and a turbidity measurement value (water quality measurement value) in the sewage treatment facility 3, Based on this turbidity correction value, the turbidity prediction value (water quality prediction value) flowing into the pump facility (upstream sewer facility) 2 predicted by the first water quality prediction unit 12 is corrected. For this reason, even if a turbidity meter (measurement unit) cannot be provided in the pump facility (upstream sewerage facility) 2, the estimated turbidity of the inflow sewage in the sewage treatment facility (downstream sewerage facility) 3 And the turbidity measurement value are taken into account, the turbidity (water quality) of the sewage flowing into the pump facility 2 (upstream sewerage facility) can be accurately predicted.

  Moreover, according to the water quality control apparatus of this Embodiment, the turbidity predicted value (water quality prediction) of the inflow sewage of the pump equipment 2 (upstream sewer equipment) corrected in the 1st water quality prediction part 12 of the water quality prediction apparatus 10. Value) is sent to the sewage discharge pump control device 14, and the sewage discharge pump control device 14 determines the sewage discharge pump 5 based on the corrected turbidity prediction value (water quality prediction value) sent from the water quality prediction device 10. Control is in progress. As described above, the sewage discharge pump control device 14 turbidity of the sewage flowing into the pump facility 2 in consideration of the deviation between the predicted turbidity value of the sewage flowing into the sewage treatment facility 3 and the measured turbidity value. Since the predicted value is used, the sewage discharge pump 5 can be more accurately controlled in accordance with the actual operation of the sewer system, and a desired amount of sewage can be discharged from the pump facility 2 to public water. Therefore, the quality of the sewage can be controlled with high accuracy.

The water quality prediction device and the water quality control device according to the present invention are not limited to the above-described embodiments, and various changes can be made.
For example, the quality of sewage water predicted by a water quality prediction device is not limited to turbidity, but UV (ultraviolet light absorbance), COD (chemical oxygen demand), BOD (biochemical oxygen demand), SS (floating matter), Other types such as the number of coliforms may be used.

As another modification, as shown in FIG. 2, a chemical injection pump 31 for injecting a liquid disinfectant into the pump facility 2 by a chemical injection line 32 and a chemical injection pump control device 33 for controlling the chemical injection pump 31. The turbidity predicted value after correction of the inflow sewage from the pump facility 2 is sent from the first water quality prediction unit 12 to the sewage discharge pump control device 14 instead of the corrected turbidity predicted value to the chemical injection pump control device 33. The predicted turbidity value may be sent.
In this modification, the water quality control device is constituted by the chemical injection pump 31 and the chemical injection pump control device 33.

  According to such a water quality control device, the turbidity prediction value (water quality prediction value) of the inflow sewage of the pump facility (upstream sewer facility) 2 corrected in the first water quality prediction unit 12 of the water quality prediction device 10 is a chemical. The chemical injection pump control device 33 controls the chemical injection pump 31 based on the corrected turbidity prediction value (water quality prediction value) sent from the water quality prediction device 10. Yes. As described above, the chemical injection pump control device 33 predicts the turbidity of the inflow sewage to the pump facility 2 which is predicted in consideration of the deviation between the predicted turbidity value of the inflow sewage of the sewage treatment facility 3 and the measured turbidity value. Since the value is used, the chemical injection pump 31 can be more accurately controlled in accordance with the actual operation of the sewer system, and a desired amount of disinfectant (chemical) can be injected into the pump facility 2. Therefore, the quality of the sewage can be controlled with high accuracy.

As another modification, as shown in FIG. 3, a screen 40 is provided on the downstream side of the sewage discharge pump 5, a screen washer 41 for washing the screen 40, and a screen washing for controlling the screen washer 41. A control device 42 is further provided, and the first water quality prediction unit 12 performs screen cleaning instead of sending the corrected turbidity predicted value of the inflow sewage from the pump facility (upstream sewer facility) 2 to the sewage discharge pump control device 14. The corrected predicted turbidity value may be sent to the control device 42.
In this modification, the water quality control device is constituted by the sewage discharge pump 5, the screen 40, the screen cleaner 41 and the screen cleaning control device 42.

  According to such a water quality control device, the turbidity prediction value (water quality prediction value) of the inflow sewage of the pump facility (upstream sewer facility) 2 corrected in the first water quality prediction unit 12 of the water quality prediction device 10 is displayed on the screen. The screen cleaning control device 42 controls the screen cleaning device 41 based on the corrected predicted turbidity value (water quality predicted value) sent from the water quality prediction device 10. As described above, the screen cleaning control device 42 predicts the turbidity predicted value of the inflowing sewage to the pump facility 2 in consideration of the deviation between the predicted turbidity value of the inflowing sewage of the sewage treatment facility 3 and the measured turbidity value. Therefore, the screen cleaner 41 can be controlled more accurately in accordance with the actual operation of the sewer system. For example, when the predicted turbidity value after correction is high, the contamination of the screen 40 is not so severe. Even at times, the screen 40 can be cleaned in advance by the screen cleaner 41, and the screen 40 can be cleaned during the rain, so that the filtration performance of the screen 40 can be improved. Therefore, the quality of the sewage can be controlled with high accuracy.

As yet another modification, as shown in FIG. 4, rainwater storage is provided by branching from a connection line 8 between a pump facility (upstream sewerage facility) 2 and a sewage treatment facility (downstream sewerage facility) 3. The first water quality prediction unit 12 is further provided with a facility (storage facility) 50, an inflow gate 51 for adjusting the inflow of sewage into the rainwater storage facility 50, and an inflow gate control device 52 for controlling the inflow gate 51. Even if the corrected turbidity predicted value after correction of the inflow sewage from the pump facility 2 is sent from the sewage discharge pump control device 14 to the inflow gate control device 52, the corrected turbidity prediction value is sent to the inflow gate control device 52. Good.
In the present modification, the rainwater storage facility 50, the inflow gate 51, and the inflow gate control device 52 constitute a water quality control device.

  According to such a water quality control device, the turbidity prediction value (water quality prediction value) of the inflow sewage of the pump facility (upstream sewer facility) 2 corrected by the first water quality prediction unit 12 of the water quality prediction device 10 flows. The inflow gate control device 52 controls the inflow gate 51 based on the corrected predicted turbidity value (water quality prediction value) sent from the water quality prediction device 10. As described above, the inflow gate control device 52 predicts the turbidity predicted value of the sewage to the pump facility 2 in consideration of the deviation between the predicted turbidity value of the sewage flowing into the sewage treatment facility 3 and the measured turbidity value. Therefore, the inflow gate 51 can be controlled in accordance with the actual operation of the sewer system, and the flow rate of the sewage flowing from the pump facility (upstream sewer facility) 2 to the rainwater storage facility (storage facility) 50 can be controlled. It can be adjusted to a desired amount, so that the quality of the sewage can be controlled with high accuracy.

As another modification, as shown in FIG. 5, a return pump 53 for returning sewage from the rainwater storage facility 50 to the connection line 8 to the sewer system shown in FIG. 4, and a return for controlling the return pump 53. A pump controller 54, and a return pump instead of the corrected turbidity predicted value of the inflow sewage from the pump facility (upstream sewer facility) 2 from the first water quality prediction unit 12 to the sewage discharge pump controller 14 The corrected predicted turbidity value may be sent to the control device 54.
In this modification, the rain water storage facility 50, the return pump 53, and the return pump controller 54 constitute a water quality control device.

  According to such a water quality control device, the turbidity prediction value (water quality prediction value) of the inflowing sewage of the pump facility (upstream sewerage facility) 2 corrected in the first water quality prediction unit 12 of the water quality prediction device 10 is returned. The return pump control device 54 controls the return pump 53 based on the corrected predicted turbidity value (water quality prediction value) sent from the water quality prediction device 10. As described above, the return pump control device 54 predicts the turbidity predicted value of the inflowing sewage to the pump facility 2 in consideration of the deviation between the predicted turbidity value of the inflowing sewage of the sewage treatment facility 3 and the measured turbidity value. Therefore, the return pump 53 can be controlled in accordance with the actual operation of the sewer system, and the flow rate of sewage returned from the rainwater storage facility (storage facility) 50 to the sewage treatment facility (downstream sewer facility) 3. Can be adjusted to a desired amount, so that the quality of the sewage can be controlled with high accuracy.

It is explanatory drawing which shows the structure of the water quality prediction apparatus and water quality control apparatus of this Embodiment. It is explanatory drawing which shows the structure of the other water quality control apparatus of this Embodiment. It is explanatory drawing which shows the structure of the further another water quality control apparatus of this Embodiment. It is explanatory drawing which shows the structure of the further another water quality control apparatus of this Embodiment. It is explanatory drawing which shows the structure of the further another water quality control apparatus of this Embodiment. It is explanatory drawing which shows the structure of the conventional water quality prediction apparatus and water quality control apparatus.

Explanation of symbols

1 Combined sewage 2 Pump equipment (upstream sewerage equipment)
3 Sewage treatment facilities (downstream sewerage facilities)
4 Treated effluent 5 Sewage effluent pump 6 Untreated effluent 7 Inflow line 8 Connection line 9a Sewage treatment facility effluent line 9b Pump facility effluent line 10 Water quality prediction device 11 Predicted inflow amount of pump facility (upstream sewerage facility) 12 First water quality prediction unit 14 Sewage discharge pump control device 20 Turbidimeter (measurement unit)
21 Predicted inflow amount of sewage treatment facility (downstream sewerage facility) 22 Second water quality prediction unit 24 Deviation calculation unit 25 Correction unit 31 Chemical injection pump 32 Chemical injection line 33 Chemical injection pump controller 40 Screen 41 Screen washer 42 Screen washing control device 50 Rainwater storage equipment (storage equipment)
51 Inflow gate 52 Inflow gate control device 53 Return pump 54 Return pump control device 80 Water quality prediction device 81 Inflow amount prediction value 82 Inflow water quality prediction unit

Claims (6)

In the water quality prediction device used in the sewer system having the upstream sewerage facility and the downstream sewerage facility provided in series,
A measuring unit that is provided on the inlet side of the downstream sewerage system and measures the quality of sewage flowing into the downstream sewerage system;
A first water quality prediction unit that inputs an inflow prediction value or rainfall intensity prediction value of an upstream sewer facility from the outside, and predicts an inflow water quality prediction value of an upstream sewer facility based on these prediction values;
A second water quality prediction unit that receives an inflow prediction value or a rainfall intensity prediction value of a downstream sewer facility from the outside, and predicts an inflow water quality prediction value of a downstream sewer facility based on these prediction values;
A deviation between the measured value measured by the measuring unit and connected to the second water quality predicting unit and the measuring unit, and the inflow water quality predicted value of the downstream sewer system sent from the second water quality predicting unit. A deviation calculating unit to calculate,
A correction unit connected to the deviation calculation unit, calculates a water quality correction value based on the deviation calculated by the deviation calculation unit, and sends the water quality correction value to the first water quality prediction unit;
With
In the first water quality prediction unit, the water quality correction value sent from the correction unit further corrects the inflow water quality prediction value of the upstream sewer facility predicted by the first water quality prediction unit. A water quality prediction device. Used in a sewer system equipped with the water quality prediction device according to claim 1,
A sewage discharge pump that discharges sewage from the upstream sewer facility to public water, and a sewage discharge pump control device that controls the sewage discharge pump;
The inflow water quality prediction value of the upstream sewer facility corrected in the first water quality prediction unit of the water quality prediction device is sent to the sewage discharge pump control device,
The said sewage discharge pump control apparatus controls the said sewage discharge pump based on the inflow water quality prediction value of the upstream sewer facilities after correction | amendment sent from the said water quality prediction apparatus. Used in a sewer system equipped with the water quality prediction device according to claim 1,
A chemical injection pump for injecting chemical into the upstream side sewer facility, and a chemical injection pump controller for controlling the chemical injection pump;
Inflow water quality prediction value of the upstream sewer system corrected in the first water quality prediction unit of the water quality prediction device is sent to the chemical injection pump control device,
The said chemical injection pump control apparatus controls the said chemical injection pump based on the inflow water quality predicted value of the upstream sewer facilities after correction | amendment sent from the said water quality prediction apparatus. Used in a sewer system equipped with the water quality prediction device according to claim 1,
A sewage discharge pump for discharging sewage from the upstream sewer facility to public water, a screen provided on the downstream side of the sewage discharge pump, a screen cleaner for cleaning the screen, and controlling the screen cleaner A screen cleaning control device,
Inflow water quality prediction value of the upstream sewer system corrected in the first water quality prediction unit of the water quality prediction device is sent to the screen cleaning control device,
The said screen washing | cleaning control apparatus controls the said screen washing | cleaning device based on the inflow water quality prediction value of the upstream sewer facilities after correction | amendment sent from the said water quality prediction apparatus. Used in a sewer system equipped with the water quality prediction device according to claim 1,
A storage facility that is branched from between the upstream sewer facility and the downstream sewer facility, an inflow gate that regulates the inflow of sewage from the upstream sewer facility to the storage facility, and the inflow gate is controlled An inflow gate control device,
The inflow water quality prediction value of the upstream sewer facility corrected in the first water quality prediction unit of the water quality prediction device is sent to the inflow gate control device,
The said inflow gate control apparatus controls the said inflow gate based on the inflow water quality prediction value of the upstream sewer facilities after correction | amendment sent from the said water quality prediction apparatus. Used in a sewer system equipped with the water quality prediction device according to claim 1,
A storage facility branched from between the upstream sewer facility and the downstream sewer facility, a return pump for returning sewage from the storage facility to the downstream sewer facility, and a return pump for controlling the return pump A control device,
The inflow water quality prediction value of the upstream sewer facility corrected in the first water quality prediction unit of the water quality prediction device is sent to the return pump control device,
The return pump control device controls the return pump based on the corrected inflow water quality predicted value of the upstream sewer facility sent from the water quality prediction device.

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