JP4358101B2 - Sewage inflow water quality prediction method and rainwater drainage support system - Google Patents

Description

  The present invention relates to a water quality prediction method and a rainwater drainage support system for predicting the quality of sewage inflow water flowing into a pumping station or the like during rainfall and controlling the drainage operation using the predicted water quality.

  Generally, in a combined sewer system, when there is rainfall in the sewer pipe installation area, rainwater flows into the sewer pipe. A pump station and a sewage treatment plant having rainwater pump wells and sewage pump wells are installed at the end of the sewer pipe through inflow dredges, and inflow water containing rainwater is retained in these rainwater pump wells and sewage pump wells. After that, it is drained to a predetermined drainage destination.

  The inflow water from the sewer pipe to the inflow trough is stored in the rainwater pump well or the sewage pump well through the sand basin as described above. Normally, rainwater pump wells have higher inflow weirs than sewage pump wells, so normal inflow water flows into sewage pump wells, drained into sewage treatment facilities by sewage pumps, and treated by sewage treatment facilities, Drained into rivers. On the other hand, when a large amount of inflow water containing rainwater flows due to rain, the water level of the inflow trough rises and the inflow water flows into the rainwater pump well. The inflow water stored in the rainwater pump well is discharged into a river by a rainwater pump.

  In such a sewerage system, when it is discharged directly from a rainwater pump well into a river, measures must be taken to minimize the contamination of the river. That is, it is necessary to appropriately control the storage in the pipe and the discharge into the river according to the inflow water amount and the inflow water quality. In addition, when it rains, so-called first flush occurs, in which sludge accumulated in the sewage pipe basin flows out into the inflow basin. It is necessary to catch the occurrence of this first flash and deal with it appropriately.

Conventionally, regarding this type of sewerage equipment, an invention has been proposed in which the quality of inflow water is predicted from the amount of rainfall and the operation amount of the pollutant component removing means is controlled (see, for example, Patent Document 1). In addition, an invention for predicting the amount of inflow water from a rainfall amount using a nonlinear model has also been proposed (see, for example, Patent Document 2).
JP 2004-249200 A JP 2000-56853 A

  However, in the invention of Patent Document 1, since the method for predicting the influent water quality is formulated from the water quality model formula, there is a problem that the formula becomes complicated. Further, the invention of Patent Document 2 is a method for predicting only the influent water amount from the rainfall, and the influent water quality is not predicted, and appropriate control combined with the influent water quality cannot be performed.

  An object of the present invention is to provide a method for predicting the water quality of sewage inflow water that can easily and accurately predict the quality of the inflow water associated with the rain, and to use the predicted water quality or the water quality and the amount of inflow water during rainfall. The object is to provide a rainwater drainage support system that can appropriately control the storage and drainage of inflow water and reduce the impact on the environment.

A method for predicting water quality of sewage inflow water according to the present invention is a method for predicting water quality of inflow water from a sewer pipe to an inflow trough, measuring rainfall in a set basin of the sewer pipe at a predetermined period, and The quality of the inflow water flowing into the dredging is measured at a predetermined cycle, and among the measured values, the current inflow water quality, some past inflow water quality, some past rainfall, and some past rainfall It is characterized by predicting the future influent water quality by the system identification method using nonlinear Hammerstein model using the power value of quantity.

The rainwater drainage support system according to the present invention is lower than the rainwater pump between the rainwater pump well provided with an inflow weir of a predetermined height between the inflow fence provided at the terminal portion of the sewer pipe and the inflow well. The sewage pump well provided with the inflow weir, the overflow weir provided between the sewage pump well and the rainwater catchment basin provided with the gate between the inflow dredging basin, or either A rainwater drainage support system in a sewer facility for flowing inflow water from a sewer pipe and draining the inflow water to a predetermined drainage destination, measuring means for measuring rainfall in the basin where the sewer pipe is installed, and the inflow A measuring means for measuring the quality of the inflow water flowing into the dredging,
Data collection and storage means for periodically collecting and storing the rainfall and inflow water quality measured by each of the measurement means, and the current inflow water quality and the past number of data stored in the storage means. A prediction means for predicting the inflow water quality by a system identification method using a nonlinear Hammerstein model using some inflow water quality, several past rainfalls, and power values of several past rainfalls. Operation for each of the sewage pump that sends water from the sewage pump well to the sewage treatment plant, the storm water pump that drains water from the storm water pump well, and the storm water pond pump that sends water from the storm water pond to the sewage pump well And a driving support means for generating a command to open the gate to the rainwater reservoir .

Further, the rainwater drainage support system of the present invention is measured by the measuring means for measuring the rainfall in the basin where the sewer pipe is installed, the measuring means for measuring the amount of inflow water and the quality of the inflow water into the inflow trough, and the measurement means. Data collection and storage means for periodically collecting and storing rainfall, inflow water quantity and inflow water quality, and among the data stored in the storage means, current inflow water quantity and some past inflow water quantity, Predicting the influent water volume by the system identification method using the nonlinear Hammerstein model using some past rainfalls and the power values of several past rainfalls, as well as the current influent water quality and the past influent water quality, some rainfall in the past, the inflow water by system identification technique by nonlinear Hammerstein model using the exponential value of a number of rainfall in the past Prediction means for measuring, using the inflow water amount and the inlet water quality predicted by the prediction means, sewage pump water from the sewage pump well to the sewage treatment plant, rainwater pump for draining the rainwater pump well, from said rainwater ponding pond A configuration may be provided that includes an operation command for each of the rainwater reservoir pumps that send water to the sewage pump well, and an operation support means that generates an instruction to open the gate to the rainwater reservoir .

In the rainwater drainage support system of the present invention, the water quality measuring means is also provided in the sewer pipe, the data collection and storage means periodically collects and stores the water quality measured in the sewer pipe, and the prediction means The water quality in the sewer pipe and the water quality in some past sewer pipes, some past rainfall, and the power value of some past rainfall, it flows into the inflow trough by the system identification method by nonlinear Hammerstein model The sewage pump has a function of predicting the water quality in the sewer pipe before the operation, and the operation support means uses the water quality in the sewer pipe before flowing into the predicted inflow trough to send water from the sewage pump well to the sewage treatment plant. , Rainwater pumps that drain from rainwater pump wells, operation commands for rainwater reservoir pumps that send water from rainwater reservoirs to the sewage pump wells, and rainwater traps It may be configured to cause opening command of the gate to the pond.

In the rainwater drainage support system of the present invention, the flow rate measuring means is provided in the sewer pipe, the data collection and storage means periodically collects and stores the flow rate measured in the sewer pipe, and the prediction means Using the non-linear Hammerstein model system identification method , the flow rate in the sewer pipe and the past flow in the sewer pipe, the past rainfall, and the power values of the past rainfalls flow into the inflow trough. Combined with the function of predicting the flow rate in the previous sewer pipe, the operation support means also uses the flow rate in the sewer pipe before flowing into the predicted inflow trough, and sends the sewage pump from the sewage pump well to the sewage treatment plant, Operational instructions for each of a storm water pump that drains from a storm water pump well, a storm water pond pump that sends water from a storm water pond to the sewage pump well, and storm water Opening command of the gate to may be configured to produce.

In the rainwater drainage support system of the present invention, the water level measuring means is provided in the sewer pipe, and the data collection and storage means periodically collects and stores the water level measured in the sewer pipe, and further from the weather information system. The forecasting means obtains the water level in the sewer pipe on a clear day from the data storage means, obtains the height of earth and sand or contaminants in the sewer pipe, and in the rainy day The structure which further has a function which estimates the flow volume and water quality of the first flush water which flows into an inflow trough from the flow volume prediction value and water quality prediction value in a sewer pipe may be sufficient.

  Further, in the rainwater drainage support system of the present invention, the operation support means, when the predicted water quality of the influent water is worse than a predetermined threshold, the rainwater pump well is within the range that does not exceed the upper limit threshold of rainfall. An operation instruction is given so that the sewage pump provided in the sewage pump well is operated without operating the provided rainwater pump.

  Furthermore, in the rainwater drainage support system of the present invention, the operation support means discriminates the first flush from the predicted inflow water amount, stores the first flush water in the rainwater retention pond, and the rainwater retention occurs when the rainfall falls below a predetermined value. An operation command is given to return the accumulated water to the sewage pump well by the pond pump.

  According to the present invention, since the inflow water quality is predicted by the system identification method (nonlinear Hammerstein model) based on the measured value of the inflow water quality, the past rainfall, etc., it is easy to predict by the same method as the prediction of the inflow water amount. Can do. Moreover, since the storage and drainage of inflow water can be appropriately controlled based on these prediction results, operation with reduced environmental impact is possible.

  Hereinafter, an embodiment of a water quality prediction method and rainwater drainage support system according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows the overall configuration of this embodiment. First, a sewer system to which the present invention is applied will be described. In FIG. 1, reference numeral 11 denotes a confluent sewer pipe, and rainwater that has fallen into the basin flows together with domestic wastewater and industrial wastewater in the installation area. Reference numeral 12 denotes an inflow trough, which is provided in a pump station or a sewage treatment plant, and temporarily stores the inflow water from the sewer pipe 11.

13 rainwater pump well, 14 sewage pump well 15 in rain water bearing ponds, influent from sewer pipe 11, flows through the sand basin (not shown) from the flow dock 12. Usually, the rainwater pump well 13 has an inflow weir higher than the sewage pump well 14 between the inflow trough 12 and the inflow water in the normal time flows into the sewage pump well 14 having a lower inflow weir. On the other hand, when a large amount of inflow water containing rainwater flows in during the rain, the water level of the inflow trough 12 rises, overflows the high inflow weir and flows into the rainwater pump well 13. Rain water bearing reservoir 15 is intended to stay the sewage pump well 14 overflowing flowing water, not shown and overflow weir is provided between the sewage pump well 14, or (not shown) provided between the inflow channel 12 Incoming water is received through the gate.

The rainwater pump well 13 is provided with a rainwater pump 16, and the inflow water (rainwater) flowing into and stored in the rainwater pump well 13 is discharged into the river 18 or the like by the rainwater pump 16. Further, the sewage pump well 14 is provided with a sewage pump 17, and the inflow water (sewage) flowing into and stored in the sewage pump well 14 is sent to a sewage treatment facility (not shown) by the sewage pump 17. After being treated with water, it is drained into rivers. At this time, since the sewage exceeding the treatment amount of the sewage treatment plant overflows from the sewage pump well 14 as it is, it is provided between the overflow weir provided between the sewage pump well 14 and the inflow trough 12. sent to rain water bearing pond 15 from the gate, they are retained. The rain water bearing reservoir 15 and rain water bearing pond pump 19 is provided, standing water is returned by the rainwater ponding pond pump 19 to sewage pump well 14 at the timing at which the influent water is sufficiently reduced to flow into sewer 12 Is done.

  That is, the inflow water from the sewer pipe 11 is either or each of the rainwater pump well 13, the sewage pump well 14, and further the rainwater retention basin 15 through the inflow trough 12 provided at the end portion thereof or a sand basin (not shown). Then, it is drained to a predetermined drainage destination.

  21 is a ground rain gauge, and 22 is a radar rain gauge, which are used as measuring means for measuring the rainfall in the installation basin of the sewer pipe 11. 23 is a water level meter, and 24 is a water quality meter, which are provided on the inflow trough 12 and are used as measuring means for measuring the amount of inflow water and the inflow water quality to the inflow trough 12.

  Next, the arithmetic and control unit 31 that provides rainwater drainage support based on the measurement values from these measuring means will be described. The arithmetic control device 31 is configured by a computer system, and includes a data collection unit 32, a data storage unit 33, a prediction unit 34, a calculation unit 35, a driving support unit 36, and a controller unit 37. In addition, the weather mode prediction means 38 may be provided.

  The data collecting means 32 includes the rainfall measured by the measuring means (the ground rainfall 21a and the radar rainfall 22a), the inflow water level 23a and the inflow water quality 24a for obtaining the inflow water amount, and the pumps 16, 17, 19 described above. The pump information 41 relating to the operation state of the pump and the discharge amount 42 of each of the pumps 16, 17, and 19 are periodically collected. The data storage unit 33 stores various data periodically collected by the data collection unit 32.

  The predicting means 34 predicts the influent water quality and the influent water amount by using a non-linear Hammerstein model using various data stored in the data storage means 33. The system identification method (nonlinear Hammerstein model) is simply expressed by the following model expression. That is, the influent water quality is obtained by the following equation (1), and the influent water amount is obtained by the equation (2).

Predicted influent quality = Current (t) influent quality x α1 + past (t-1) influent quality x α2 + past (t-2)
Inflow water quality x α3 + ・ ・ ・
+ Past (t-1) rainfall xβ1 + Past (t-2) rainfall xβ2 + ...
+ (Past (t-1) rainfall) ² x γ1 + (Past (t-2) rainfall) ² x γ2 + ...
+ (Past (t-1) rainfall) ³ x δ1 + (Past (t-2) rainfall) ³ x δ2 +
・
・
(1)
Predicted influent water = Current inflow (t) Inflow water x α11 + Past inflow (t-1) Inflow water x α12 + Past (t-2)
Inflowing water amount × α13 + ...
+ Past (t-1) rainfall x β11 + Past (t-2) rainfall x β12 ...
+ (Past (t-1) rainfall) ² x γ11 + (Past (t-2) rainfall) ² x γ12 + ...
+ (Past (t-1 rainfall)) (rainfall of the past ^{(t-2)) 3 ×} δ11 + 3 × δ12 + ···
・
・
(2)
In the above equations (1) and (2), t represents the present time, t-1 represents the first past, t-2 represents the second past,..., Α11, α2, α3,. , Α12, α13, ···, β1, β2, ···, β11, β12, ···, γ1, γ2, ···, γ11, γ12, ···, δ1, δ2, ···, δ11, δ12, ··· Each coefficient is set for each facility according to the size and characteristics of the sewer pipe 11 and the inflow trough 12.

  In other words, since the influent water quality and the influent water volume follow the past rainfall in a predetermined non-linear relationship, the current influent water quality, the past several influent water qualities, the past several rainfalls, the past several Using the power value of rainfall, the future influent water quality is predicted by the model equation (1). Similarly, by using the current inflow, some past inflows, some past rainfall, and the power of some past rainfall, the future inflow is calculated by the above model equation (2). Ask.

  The calculating means 35 calculates the operation amounts (operating number and rotational speed) of the pumps 16, 17 and 19 according to the influent water quality and the influent water amount predicted by the predicting means 34. The operation support means 36 generates an operation / stop command relating to the storage and drainage of the inflow water to the sewage pump well 14, the rainwater pump well 13, and the stormwater reservoir 15 based on the inflow water amount and the inflow water quality predicted by the prediction means 34. . The controller unit 37 generates a control output to the corresponding device based on the operation command. The weather mode prediction means 38 predicts a weather mode such as a normal rainfall mode or a heavy rain mode from the amount of rainfall, and can correct the value obtained by the calculation means 35 based on the predicted weather mode.

  Next, the operation will be described. In general, the first flash in the early stage of rainfall is a problem in sewerage facilities. The first flush occurred during the initial rainfall, but it was not known when the sludge accumulated in the sewer pipes would flow out and reach the pump station. Therefore, the present invention is configured to appropriately cope with the first flush by predicting the inflow water quality and the inflow water amount including the sludge accumulated during the rain. For example, for the first flush, the wastewater is stored in the sewer pipe or in the rainwater reservoir as much as possible, the discharge into the river is suppressed as much as possible, and the water is sent to the sewage treatment facility. Like to do.

  Here, the method for predicting the quality of sewage inflow water according to the present invention obtains the inflow water quality from the amount of rainfall. The input is the amount of rainfall or rainfall intensity, and the output is the inflow water quality (E. coli, COD, BOD, phosphorus, nitrogen, etc.). Inflow water quality prediction value is provided by system identification method. That is, according to the above-described model equation (1), the regression calculation is performed using the current inflow water quality measurement value and the past several inflow water quality measurement values, and the multiple regression using the past several rainfall measurement values. An inflow water quality that has a non-linear relationship with rainfall is predicted by performing calculation and further considering some past power (for example, square and third power) values.

  Thus, since the quality of the inflow water to the inflow trough 12 can be predicted, appropriate control can be performed by the operation support means 36 for the storage and drainage of the inflow water according to the predicted inflow water quality. In addition, since the prediction means 34 can predict the amount of inflow water to the inflow trough 12 by the model equation (2), more appropriate operation control can be performed by using the predicted inflow water amount and the predicted inflow water quality. . This will be described in detail below.

  In the sewer system, when there is rainfall in the installation area of the sewer pipe 11, the rain water flows into the sewer pipe 11, and, as described above, from the inflow trough 12 provided at the end portion thereof, through a sand basin (not shown). And stored in the rainwater pump well 13, the sewage pump well 14, and the rainwater reservoir 15. Since the storm water pump well 13 has a higher inflow weir than the sewage pump well 14, the normal inflow water flows into the sewage pump well 14 and is drained to the sewage treatment facility by the sewage pump 17 and processed by the sewage treatment facility. Drained into rivers. Moreover, the sewage exceeding the treatment amount of the sewage treatment plant is sent from the sewage pump well 14 to the rainwater retention pond 15 and stays there.

  When a large amount of inflowing water containing rainwater flows in during rainfall, the water level of the inflow trough 12 rises and the inflowing water also flows into the rainwater pump well 13. Rainwater stored in the rainwater pump well 13 is discharged to the river 18 and the like by the rainwater pump 16. However, since the inflowing water by the first flush at the time of rainfall, etc., the accumulated sludge accumulated in the sewer pipe 11 flows out, when this flows into the rainwater pump well 13 and is discharged into the river 18 by the rainwater pump 16, Rainwater with poor water quality containing sedimented sludge will be discharged, which is undesirable in the environment. Therefore, the inflow water quality including the first flush is predicted from the rain condition, and the sewage inflow amount is predicted to judge whether the water is stored or discharged, and the control is performed in a safe and environmentally friendly manner.

  In FIG. 1, during rainfall, the rainfall is measured by the ground rainfall 21 or the radar rainfall 22, and the data 21 a and 22 a are collected by the data collecting means 32 and recorded by the data storage means 33. Similarly, the water level data 23 a is collected from the water level gauge 24 provided in the inflow trough 12, and the inflow water quality data 24 a is collected from the water quality gauge 23 and stored in the data storage means 33. Data collection by these data collection means 32 is performed in a predetermined cycle, and the data storage means 33 stores the data collected in each cycle.

  The predicting means 34 predicts and calculates the influent water quality and the influent water quantity from the rainfall and inflow water quality data recorded in the data storage means 33 by the above-described nonlinear Hemmerstein model equations (1) and (2). The non-linear Hemmerstein model is a model that focuses on the non-linear relationship between rainfall and inflow water quality or inflow water volume. When the rainfall increases, the inflow water quality and the inflow water volume are proportional to the power of the rainfall (for example, the second power or the third power). The mechanism was applied to influent quality and quantity.

  Based on the predicted value of the influent water quality thus predicted, the operation support means 36 stores the rainwater in the rainwater reservoir 15, the storage in the pipe including the inflow trough 12, the stoppage of the rainwater pump 16, and the number of units operated. The operation stop of the sewage pump 17 and the number of operating units are determined. For example, if the predicted water quality of the influent water is worse than a predetermined threshold, the sewage pump is not operated without operating the rainwater pump 16 provided in the rainwater pump well 13 within a range not exceeding the upper limit threshold of rainfall. The sewage pump 17 provided in the well 14 is instructed to operate. In addition, if it is predicted that the quality of the influent water is deteriorating, it may be operated as a feed forward such as accelerating the operation of sewage treatment plant facilities (advanced treatment, standard activated sludge method, oxidation ditch method, etc.). it can.

Thus, since the inflow water quality and the inflow water amount can be predicted from the rainfall amount by either or both of the ground rain gauge 21 and the radar rain gauge 22, it is possible to predict the occurrence of the first flash. That is, the driving support unit 36 determines the first flush from the predicted inflow water amount, the pump 19 of the first flush water is stored in water reservoir 15 residence rainwater, when rainfall is below a predetermined value rainwater water bearing pond 15 Thus, the operation command can be given to return the accumulated water to the sewage pump well 14. For example, in the case of the first flush, a gate (not shown) from the inflow trough 12 to the rainwater reservoir 15 is opened, and the first flush water is stored in the rainwater reservoir 15 from the beginning. The retained first flush water is used when the rainwater reservoir 15 is used by using the rainwater reservoir pump 19 when the inflow water amount is sufficiently reduced, for example, when the rainfall cannot be measured by the ground rain gauge 21 or the radar rain gauge 22. To the sewage pump well 14. The sewage pump well 14 can be sent to a sewage treatment facility (not shown) by a sewage pump 17 and subjected to sewage treatment (advanced treatment, standard activated sludge method, oxidation ditch method, etc.) and then discharged into the river 18 and the environment. it is possible to perform a little luck rolling of the adverse effects on.

Next, the embodiment shown in FIG. 2 will be described. In this embodiment, a water quality meter 45, a flow meter 46, and a water level meter 47 are newly provided in the sewer pipe 11 as means for measuring water quality, flow rate, and water level, compared to the embodiment shown in FIG. measurement data 45a, 46a, 47a is collected at a predetermined period by the data acquisition unit 3 2, and to remember this collected data to the data storage means 33. The data acquisition unit 3 3 and the data storage means 33, may have been obtained by storing weather information from the weather information system, not shown.

In addition to the prediction of the inflow water quality and the inflow amount to the inflow trough 12 described above, the predicting means 34 also includes the water quality in the sewer pipe 11, the flow rate in the sewer pipe 11, and the earth and sand flowing into the inflow trough 12 from Alternatively, the amount of contaminants is predicted, that is, the predicting means 34 is configured so that the water quality in the current sewer pipe 11 and the water quality in some past sewer pipes 11, some past rainfall, and some past rainfall. The water quality at the installation point of the water quality meter 45 in the sewer pipe 11 before flowing into the inflow trough 12 is predicted by the model equation (1) using the power value of.

  Further, the prediction means 34 uses the current flow rate in the sewer pipe 11 and the flow rate in the past several sewer pipes 11, some past rainfall amounts, and the power value of some past rainfall amounts, From the model equation (2), the flow rate at the installation point of the flow meter 46 in the sewer pipe 11 before flowing into the inflow trough 12 is predicted.

  Further, the predicting means 34 obtains the water level in the sewer pipe 11 on a sunny day from the data storage means 33, obtains the height of earth and sand or contaminants in the sewer pipe 11, and the flow rate in the sewer pipe 11 on a rainy day. And the flow quality of the first flush water flowing into the inflow trough 12 and the water quality are predicted from the water quality.

  In this embodiment, a water quality meter 45, a flow meter 46, and a water level meter 47 are newly provided in the sewer pipe 11, and these measurement data 45a, 46a, 47a are collected and stored at a predetermined cycle. By obtaining the rainfall amount from either or both of the ground rain gauge 21 and the radar rainfall amount 22, it is possible to predict the flow rate and water quality at the installation position of the measuring means in the sewer pipe 11. That is, the flow rate and water quality before flowing into the inflow trough 12 can be predicted. For this reason, it is possible to more reliably and accurately perform storage in the rainwater reservoir 15, stop operation of the rainwater pump 16, support / control of operation / stop of the sewage pump 17.

  Also, the number of consecutive days on a clear day is calculated from the ground rain gauge data 21a, the radar rain gauge data 22a, or a weather information system such as a weather forecast, and the water level 47a in the sewer pipe 11 on the day when the sunny day continues is measured. The height of earth and sand or impurities stored in the sewer pipe 11 is measured. And the inflow water quantity and inflow water quality which flow into the inflow trough 12 from the flow rate 45a in the sewer pipe 11 and the pipe | tube water quality 46a in a rainy day are estimated. Normally, if the sunny day continues, impurities tend to adhere and accumulate in the sewer pipe 11, and the impurities flow into the inflow trough 12 on a rainy day. In this way, the amount of inflow water and the quality of the inflow water of the first flush water can be accurately predicted.

  The BOD-SS load (inflow load of organic pollutant BOD per treatment plant weight) may be calculated from the influent water quality.

1 is a system configuration diagram showing an embodiment of a rainwater drainage support system according to the present invention. It is a system block diagram which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Sewer pipe 12 Inflow trough 13 Rainwater pump well 14 Sewage pump well 15 Rainwater retention pond 23,24 Inflow water quality and inflow measuring means 32,33 Data collection and storage means 34 Prediction means 36 Operation support means 45,46 , 47 Sewer pipe water quality, flow rate, water level meter means

Claims (8)

A method for predicting the quality of inflow water from a sewer pipe to an inflow basin,
While measuring the amount of rainfall in the installation basin of the sewer pipe at a predetermined cycle, and measuring the quality of the inflow water flowing into the inflow trough at a predetermined cycle,
Of these measured values, system identification using the nonlinear Hammerstein model using the current influent quality and several past influent qualities, several past rainfalls, and the power values of several past rainfalls A method for predicting the quality of sewage inflow water, characterized by predicting the future inflow water quality using a method. A storm water pump well provided with an inflow weir of a predetermined height between the inflow basin provided at the end portion of the sewer pipe, and a sewage pump well provided with an inflow dam lower than the storm water pump between the inflow basin Inflow water from the sewer pipe is allowed to flow into each or one of the rainwater reservoirs provided with overflow weirs between the sewage pump wells and gates provided between the wells. , A rainwater drainage support system in a sewer facility that drains the inflow water to a predetermined drainage destination,
A measuring means for measuring rainfall in an installation basin of the sewer pipe,
Measuring means for measuring the quality of the inflow water flowing into the inflow trough;
Data collection and storage means for periodically collecting and storing the rainfall and influent water quality measured by each of the measurement means;
Of the data stored in this storage means, the current inflow water quality, some past inflow water quality, some past rainfall, and some power of past rainfall are calculated using the nonlinear Hammerstein model. Predictive means for predicting influent water quality by system identification method ,
Using the influent water quality predicted by this predicting means, the sewage pump that feeds water from the sewage pump well to the sewage treatment plant, the storm water pump that drains water from the storm water pump well, and the storm water pond that feeds water from the storm water reservoir to the sewage pump well A rainwater drainage support system , comprising: an operation command for each of the pumps, and an operation support means for generating an instruction to open the gate to the rainwater reservoir . A storm water pump well provided with an inflow weir of a predetermined height between the inflow basin provided at the end portion of the sewer pipe, and a sewage pump well provided with an inflow dam lower than the storm water pump between the inflow basin Inflow water from the sewer pipe is allowed to flow into each or one of the rainwater reservoirs provided with overflow weirs between the sewage pump wells and gates provided between the wells. , A rainwater drainage support system in a sewer facility that drains the inflow water to a predetermined drainage destination,
A measuring means for measuring rainfall in an installation basin of the sewer pipe,
Measuring means for measuring the amount of inflow water and the quality of the inflow water to the inflow trough;
Data collection and storage means for periodically collecting and storing the rainfall, inflow water quantity and inflow water quality measured by each of the measurement means;
Among the data stored in the storage unit, inflow water amount and number of the inflow water amount of past time, some rainfall in the past, due to the nonlinear Hammerstein model using the exponential value of a number of rainfall in the past A system identification method is used to predict the influent water volume, and the current influent water quality, past influent water quality, past past rainfall, and the past several rainfall power values using a nonlinear Hammerstein model. Predictive means for predicting influent water quality by system identification method ,
Using the inflow water amount and the inflow water quality predicted by the predicting means, the sewage pump that feeds water from the sewage pump well to the sewage treatment plant, the storm water pump that drains water from the storm water pump well, and the sewage pump well that feeds water from the storm water reservoir. A rainwater drainage support system , comprising: an operation command for each of the rainwater reservoir pumps, and an operation support means for generating an instruction to open the gate to the rainwater reservoir . A water quality measuring means is also provided in the sewer pipe, and the data collection and storage means periodically collects and stores the water quality measured in the sewer pipe,
The prediction method is a system identification method based on the nonlinear Hammerstein model using the current water quality in the sewer pipe and the water quality in the past several sewer pipes, some past rainfall, and the power values of some past rainfall Has the function of predicting the water quality in the sewer pipe before flowing into the inflow trough,
The operation support means also uses the water quality in the sewer pipe before flowing into the predicted inflow basin, using the sewage pump that sends water from the sewage pump well to the sewage treatment plant, the storm water pump that drains from the storm water pump well, and the rainwater reservoir. The rainwater drainage support system according to claim 2 or 3, wherein an operation command for each of the stormwater pond pumps that send water to the sewage pump well and an instruction to open the gate to the stormwater pond are generated. . The flow rate measuring means is provided in the sewer pipe, and the data collection and storage means periodically collects and stores the flow rate measured in the sewer pipe,
The prediction means is a system identification method using a non-linear Hammerstein model using the current flow in the sewer pipe and the flow in the past several sewer pipes, some past rainfall, and the power value of some past rainfall Has the function of predicting the flow rate in the sewer pipe before flowing into the inflow trough,
The operation support means also uses the flow rate in the sewer pipe before flowing into the predicted inflow trough, from the sewage pump well that sends water from the sewage pump well to the sewage treatment plant, from the rainwater pump that drains from the rainwater pump well, from the rainwater reservoir. The rainwater drainage support system according to claim 4, wherein an operation command for each of the stormwater pond pumps that send water to the sewage pump well and an instruction to open the gate to the stormwater pond are generated. In the sewer pipe, water level measurement means in the pipe is provided, and the data collection and storage means periodically collects and stores the water level measured in the sewer pipe, and further obtains and stores weather information from the weather information system. Can
The prediction means obtains the water level in the sewer pipe on a clear day from the storage means, obtains the height of earth and sand or contaminants in the sewer pipe, and flows into the inflow trough from the predicted flow rate and water quality in the sewer pipe on a rainy day. The rainwater drainage support system according to claim 5, further comprising a function of predicting a flow rate and water quality of the first flush water.   If the predicted influent water quality is worse than a predetermined threshold value, the operation support means does not operate the rainwater pump provided in the rainwater pump well within a range not exceeding the upper limit threshold of rainfall. The rainwater drainage support system according to any one of claims 2 to 6, wherein an operation command is given to operate a sewage pump provided in a pump well. Driving assistance means discriminates the first flush from the predicted inflow water amount, the first flush water is stored in the rainwater water bearing ponds, sewage pump well the accumulated water when the rainfall is below a predetermined value by the pump rainwater retention pond The rainwater drainage support system according to any one of claims 3 to 6, wherein an operation command is issued so as to be returned to the vehicle.

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