JP6845775B2 - Water treatment control device and water treatment system - Google Patents

Description

The present invention relates to a water treatment control device and a water treatment system that control a water treatment device using activated sludge.

At sewage treatment plants, sewage is generally treated according to the following procedure. First, solids are removed in the sand basin and the first settling basin. The solid content separated in the first settling basin is transferred to the sludge treatment as the first settling basin sludge. First, the effluent from the sedimentation basin removes organic matter, nitrogen, and phosphorus by the action of microorganisms (activated sludge) in the biological reaction tank. After that, the activated sludge is settled and separated by gravity sedimentation in the final sedimentation basin, and the supernatant water is discharged into public water areas as effluent water. The activated sludge settled and separated in the final settling basin is returned to the biological reaction tank and used again for sewage treatment.
In a combined sewage system that consolidates sewage and rainwater into a sewage treatment plant with the same pipe, inflow sewage that exceeds the maximum planned sewage amount is generally treated by first removing solids in the settling basin and then disinfecting it. After that, it is released into public water areas. In the simple treatment, the conventional biological treatment is not performed, and the reduction of the environmental load on the discharge destination is an issue.

Therefore, for example, Non-Patent Document 1 has been proposed as a method for increasing the amount of biological treatment and reducing the simple treatment discharge flow rate, and it has been confirmed that the discharge pollution load can be reduced while maintaining good treated water quality. There is.
Further, for example, Patent Document 1 describes a sewage treatment system that can correctly determine whether or not direct discharge can be performed by using an existing system and automatically performs operations such as direct discharge. The technology to be used is proposed. In Patent Document 1, the inflow increase status calculation unit that inputs the total pump water pumping amount and the rainfall amount and outputs the increase status of the inflow amount to the inflow water dilution status calculation unit by executing fuzzy inference, and the inflow increase. Input the output of the status calculation unit, the dissolved oxygen concentration value, and the air flow rate of the reaction tank to determine the dilution status of the inflow water. water treatment system is disclosed that have a flowing water treatment operation unit constituted by the determination / operation instruction section for outputting a command for start / stop of discharge pump.

JP-A-2002-136987

Takahiro Yamamoto et al., Improvement of combined sewerage system using existing facilities in Osaka City, Journal of Environmental System Measurement and Control Society, Vol. 10, No. 2 (2006)

However, in the water treatment system described in Non-Patent Document 1 and the sewage treatment system described in Patent Document 1, the amount that can be accepted into the biological reaction tank is limited to the solid-liquid separation capacity in the first settling basin and the final settling basin. To. Therefore, for example, when the inflow load is high, such as the first flush in which pollutants accumulated in the sewage pipe flow in at once at the start of rainfall, or at the peak of sewage concentration, the amount of inflow to the biological reaction tank depends on the sludge accumulation status of the sedimentation basin. May have to be restricted.
Therefore, the present invention provides a water treatment control device capable of reducing the discharge pollutant load while ensuring the maximum amount of biological treatment even when the inflow flow rate of sewage (water to be treated) suddenly increases. Provide a water treatment system.

In order to solve the above problems, the water treatment control device according to the present invention has at least a first settling pond that sewers and separates solids contained in sewage that is the water to be treated, and a runoff water that flows out from the first settling pond. A water treatment control device that controls a water treatment device having a reaction tank in which a part or all of the reaction tank is treated with activated sludge, and a final settling pond in which the effluent flowing out of the reaction tank is settled and separated into activated sludge and treated water. The first sedimentation is based on the predicted values of the rainfall information acquisition unit that acquires the rainfall information, the inflow sewage amount prediction unit that predicts the inflow amount of the sewage based on the rainfall information, and the inflow sewage amount prediction unit. The sludge withdrawal amount control unit for controlling the sludge withdrawal amount from the pond and / or the sludge withdrawal amount from the final settling pond is provided , and the sludge withdrawal amount control unit is provided by the MLSS measuring unit installed in the reaction tank. Based on the measured activated sludge concentration and the sewage inflow amount predicted based on the rainfall information, the predicted value of the activated sludge inflow amount into the final settling pond is obtained, and the final settling pond measured by the sludge concentration meter. based on the predicted value of the inflow of activated sludge to the activated sludge concentration and the settling tank in extracted sludge from, characterized that you control the extracted sludge amount from the settling tank.
In addition, the water treatment system according to the present invention includes (1) at least a first settling basin that sediments and separates solids contained in sewage that is the water to be treated, and a part of the runoff that flows out from the first settling basin. A reaction tank that treats everything with active sludge, a water treatment device that has a final settling basin that setstles and separates the effluent flowing out of the reaction tank into active sludge and treated water, and (2) rainfall information for acquiring rainfall information. The amount of sludge withdrawn from the first settling basin and / or the final sedimentation based on the acquisition unit, the inflow sewage amount prediction unit that predicts the inflow amount of the sewage based on the rainfall information, and the predicted value of the inflow sewage amount prediction unit. A water treatment control device having a sludge withdrawal amount control unit for controlling the amount of sludge withdrawn from the pond is provided , and the water treatment device includes an MLSS measuring unit installed in the reaction tank and withdrawal from the final settling basin. A sludge concentration meter for measuring the active sludge concentration in sludge is provided, and the sludge withdrawal amount control unit is based on the active sludge concentration measured by the MLSS measuring unit and the inflow amount of sewage predicted based on the rainfall information. The predicted value of the inflow of active sludge into the final settling basin was obtained, and based on the predicted value of the active sludge concentration measured by the sludge concentration meter and the predicted value of the inflow of active sludge into the final settling basin, from the final settling basin. characterized that you control the extracted sludge of.

According to the present invention, a water treatment control device capable of reducing the discharge pollution load while ensuring the maximum amount of biological treatment even when the inflow flow rate of sewage (water to be treated) suddenly increases. It becomes possible to provide a water treatment system.
Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a schematic whole block diagram of the water treatment system of Example 1 which concerns on one Example of this invention. It is a functional block diagram of the water treatment control device shown in FIG. It is a flow rate control flow chart of the first settling basin sludge by the water treatment control apparatus shown in FIG. It is a schematic overall block diagram of the modification of the water treatment system shown in FIG. It is a functional block diagram of the water treatment control device shown in FIG. It is a control flow diagram of the returned sludge by the water treatment control apparatus shown in FIG. It is a schematic overall block diagram of the water treatment system of Example 2 which concerns on another Example of this invention. It is a functional block diagram of the water treatment control device shown in FIG. 7. It is a flow rate control flow chart of the surplus sludge by the water treatment control apparatus shown in FIG.

Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic overall configuration diagram of the water treatment system of Example 1 according to an embodiment of the present invention. In FIG. 1, the solid line shows the piping and the dotted line shows the signal line. The water treatment system 1 according to the present embodiment is a water treatment device 2 for removing organic substances and the like from domestic wastewater or industrial wastewater (water to be treated) using activated sludge in the standard activated sludge method, and water. A processing control device 3 is provided.

(Configuration of water treatment device 2)
As shown in FIG. 1, the water treatment apparatus 2 includes a first settling basin 4, an aerobic tank (reaction tank) 5, and a final settling basin 6 in this order from the inflow side of the sewage to be treated. As shown in FIG. 1, the aerobic tank (reaction tank) 5 is provided in four stages or in series of four tanks. In the following, a case where four aerobic tanks (reaction tanks) 5 are provided in series is shown as an example, but the number of tanks is not limited to this and is appropriately set.

For example, sewage 100, which is water to be treated, flows into the first sedimentation basin 4 from a sand basin (not shown), and the solid content contained in the sewage (water to be treated) 100 in the first sedimentation basin 4 is used as the first sedimentation basin sludge 101. It is settled and separated by gravity sedimentation. The first settling basin sludge 101 is transferred to a sludge treatment (not shown) through the first settling basin sludge pump 7. The first settling basin sludge flow meter 16 installed in the flow path of the first settling basin sludge 101 measures the flow rate of the first settling basin sludge 101 drawn from the first settling basin 4 by the first settling basin sludge pump 7. The measured flow rate of the first settling basin sludge 101 is output to the water treatment control device 3 described later via a signal line. Further, the flow meter 12 installed on the upstream side of the first settling basin 4 measures the flow rate of the sewage (treated water) 100 that first flows into the settling basin 4. The measured flow rate of the sewage 100 is output to the water treatment control device 3 described later via the signal line.

Further, the first settling basin outflow water 102 and the returned sludge 103 that flow out from the first settling basin 4 flow into the aerobic tank (reaction tank) 5 on the most upstream side (first stage), and are aerobic dependent in the activated sludge. Organic matter is oxidized by vegetative bacteria. Further, an air diffuser 8 is installed in the aerobic tank (reaction tank) 5. A blower 9 is connected to the air diffuser 8 to supply air.

The final sedimentation basin 6 is a facility for sedimentation and separation of the supernatant liquid and activated sludge by gravity sedimentation. The supernatant liquid after sedimentation separation is discharged to the outside of the system as treated water 104. Further, a part of the activated sludge 106 settled and separated is returned to the aerobic tank (reaction tank) 5 by the return pump 10 as the return sludge 103, and is subjected to a series of biological treatments again. The other part of the activated sludge 106 settled and separated is transferred as the surplus sludge 105 to the sludge treatment (not shown) by the surplus sludge pump 11.

(Configuration of water treatment control device 3)
FIG. 2 is a functional block diagram of the water treatment control device 3 in FIG. As shown in FIG. 2, the water treatment control device 3 includes a rainfall information acquisition unit 14, an inflow sewage amount prediction unit 15, a sludge extraction amount control unit 17, a communication I / F23, a measured value acquisition unit 24, and a sewage flow rate time change database. 25, the rainfall-inflow water amount correlation database 26, the input I / F27, and the output I / F28 are provided, and these are connected to each other via the internal bus 31. Further, the input I / F 27 is connected to the input unit 29 and takes in the flow rate reference value of the sewage 100 input via the input unit 29. The output I / F 28 is connected to the display unit 30, and the display unit 30 displays desired information on the screen, for example, various set values or precipitation information in the processing area as needed. Although not shown, the water treatment control device 3 also has a function of controlling the blower 9 in order to control the amount of aerated air supplied to the aerobic tank (reaction tank) 5 via the air diffuser 8. There is.

The sewage flow rate time change database 25 stores past actual data, for example, the sewage flow rate according to the time zone in the daily unit, and the time change of the sewage flow rate in each season, for example, in the year unit. Each is stored in association with each other.
Further, the rainfall-inflow water amount correlation database 26 stores the rainfall information such as the rainfall amount in the treatment area measured by the rain gauge 13 in the past and the inflow water amount of the sewage in association with each other. A rainfall radar may be used instead of the rain gauge 13.

The measurement value acquisition unit 24 first acquires the flow rate measurement value of the sewage 100 measured by the flow meter 12 installed on the upstream side of the settling basin 4 via the communication I / F 23 and the internal bus 31. In addition, the measurement value acquisition unit 24 measures the flow rate of the first settling basin sludge 101 drawn from the first settling basin 4 measured by the first settling basin sludge flow meter 16 installed in the flow path of the first settling basin sludge 101. , Acquired via communication I / F23 and internal bus 31. The measured value acquisition unit 24 performs a process such as noise removal on the acquired flow rate measurement value of the sewage 100 and transfers it to the inflow sewage amount prediction unit 15 via the internal bus 31. Further, the measured value acquisition unit 24 performs a process such as noise removal on the acquired flow rate measurement value of the first settling basin sludge 101 and transfers it to the sludge extraction amount control unit 17 via the internal bus 31.
The rainfall information acquisition unit 14 acquires rainfall information such as the amount of rainfall in the processing area measured by the rain gauge 13 via the communication I / F23 and the internal bus 31. Then, the rainfall information acquisition unit 14 transfers the acquired rainfall information such as the amount of rainfall in the processing area to the inflow sewage amount prediction unit 15 via the internal bus 31.

The inflow sewage amount prediction unit 15 includes a flow rate measurement value of the sewage 100 transferred from the measurement value acquisition unit 24 (measured flow rate of the sewage 100), a rainfall amount in the treatment area transferred from the rainfall information acquisition unit 14, and the like. Based on the rainfall information of, the future flow rate of sewage 100 is predicted. The inflow sewage amount prediction unit 15 transfers the predicted future flow rate of the sewage 100 to the sludge extraction amount control unit 17 via the internal bus 31.
Here, the method of predicting the flow rate of the sewage 100 in the inflow sewage amount prediction unit 15 will be outlined. First, the inflow sewage amount prediction unit 15 performs the flow rate measurement value of the sewage 100 transferred from the measurement value acquisition unit 24 (measured flow rate of the sewage 100) and the past actual data stored in the sewage flow rate time change database 25. Based on the time change of the flow rate of the sewage 100, the future flow rate of the sewage 100 is predicted. At the same time, the inflow sewage amount prediction unit 15 uses the rainfall information such as the amount of rainfall in the treatment area transferred from the rainfall information acquisition unit 14 and the rainfall gauge 13 stored in the rainfall-inflow water amount correlation database 26 in the past. The future inflow of rainwater is predicted based on the relationship between the measured rainfall information such as the amount of rainfall in the treatment area and the inflow of sewage. Then, the inflow sewage amount prediction unit 15 totals the predicted future sewage 100 flow rate and the future rainwater inflow amount, and predicts the sewage 100 flow rate.

The sludge withdrawal amount control unit 17 first sets the flow rate of the settling basin sludge 101 based on the future flow rate of the sewage 100 predicted by the inflow sewage amount prediction unit 15 transferred via the internal bus 31. Then, the sludge extraction amount control unit 17 determines the rotation speed of the first settling basin sludge pump 7 so that the value measured by the first settling basin sludge flow meter 16 becomes equal to the set value, and the rotation of the first settling basin sludge pump 7 The flow rate of the first settling basin sludge 101 is controlled by outputting several commands to the first settling basin sludge pump 7 via the internal bus 31 and the output I / F 28. That is, the amount of sludge extracted from the first settling basin 4 is controlled.

The above-mentioned rainfall information acquisition unit 14, inflow sewage amount prediction unit 15, sludge extraction amount control unit 17, and measurement value acquisition unit 24 include, for example, a processor such as a CPU (not shown), a ROM for storing various programs, and a calculation process. It is realized by a storage device such as a RAM or an external storage device that temporarily stores data, and a processor such as a CPU reads and executes various programs stored in the ROM, and the calculation result that is the execution result is stored in the RAM or externally. Store in storage.

(Operation of water treatment control device 3)
Next, the operation of the water treatment control device 3, that is, the flow rate control method of the first settling basin sludge 101 will be described.
FIG. 3 is a flow rate control flow diagram of the first settling basin sludge by the water treatment control device 3 shown in FIG. As shown in FIG. 3, in step S101, the flow rate reference value (Q _{in_up} ) of the sewage 100 is set via the input unit 29 with reference to the planned water volume and the like.
Next, in step S102, the inflow sewage amount prediction unit 15 _{acquires the flow rate measurement value (Q in} (t)) of the sewage 100 by the flow meter 12 from the measurement value acquisition unit 24 via the internal bus 31. Precipitation information such as the amount of rainfall in the processing area is acquired from the rainfall information acquisition unit 14 via the internal bus 31.

In step S103, the inflow sewage amount prediction unit 15 compares the flow rate measurement value (Q _in (t)) of the sewage 100 with the flow rate reference value (Q _{in_up} ) of the sewage 100 set in step S101 described above. As a result of the comparison, if the flow rate measurement value (Q _in (t)) of the sewage 100 _{is equal to or higher than the flow rate reference value (Q in_up} ) of the sewage 100, the process proceeds to step S104, and the predetermined rainy weather treatment (simple treatment discharge) is performed. After that, the process returns to step S102. On the other hand, as a result of comparison, if the flow rate measurement value (Q _in (t)) of the sewage 100 _{is less than the flow rate reference value (Q in_up} ) of the sewage 100, the process proceeds to step S105.

In step S105, the inflow sewage amount prediction unit 15 receives the flow rate measurement value (Q _in (t)) of the sewage 100 transferred from the measurement value acquisition unit 24 via the internal bus 31 and the rainfall information via the internal bus 31. _{The future flow rate of the sewage 100 (Q in} (t + n · Δt)) is predicted based on the rainfall information such as the amount of rainfall in the treatment area transferred from the acquisition unit 14. Here, the predicted future flow rate of the sewage 100 (Q _in (t + n · Δt)) is the flow rate measurement value (Q _in (t)) of the sewage 100 transferred from the measurement value acquisition unit 24 as described above. And the future flow rate of the sewage 100 obtained based on the time change of the flow rate of the sewage 100 as the past actual data stored in the sewage flow rate time change database 25, and the rainfall in the treatment area transferred from the rainfall information acquisition unit 14. Rainfall information such as amount and rainfall-inflow water amount Correlation database 26 The future obtained based on the relationship between rainfall information such as rainfall amount in the treatment area measured by the rain gauge 13 in the past and the inflow water amount of sewage It is the total value of the inflow of rainwater. Here, the future means the time when the sewage 100 affected by the rainfall at the current time reaches the sewage treatment plant.

Next, in step S106, the sludge extraction amount control unit 17 sewage the predicted future sewage 100 flow rate (Q _in (t + n · Δt)) transferred from the inflow sewage amount prediction unit 15 via the internal bus 31. Compare with the flow rate reference value (Q _{in_up) of 100.} As a result of the comparison, if the predicted future flow rate of the sewage 100 (Q _in (t + n · Δt)) is _{equal to or less than the flow rate reference value (Q in_up} ) of the sewage 100, the process proceeds to step S107, and after performing the normal treatment. Return to step S102. On the other hand, as a result of comparison, if the predicted future flow rate of the sewage 100 (Q _in (t + n · Δt)) exceeds the flow rate reference value (Q _{in_up} ) of the sewage 100, the process proceeds to step S108.

In step S108, the sludge withdrawal amount control unit 17 uses the following equation (1) to obtain the flow rate (Q) of the first settling basin sludge 101 in proportion to _{the flow rate (Q in (t + n · Δt)) of the future sewage 100. P} (t + Δt)) is set.

Next, in step S109, the sludge extraction amount control unit 17, as the measurement value by the primary sedimentation sludge flowmeter 16 becomes equal to the set value _{(Q P (t + Δt)} ), the rotational speed of the primary sedimentation sludge pump 7 Is determined, and the rotation speed command of the first settling basin sludge pump 7 is output to the first settling basin sludge pump 7 via the internal bus 31 and the output I / F 28, and the process returns to step S102.

Generally, the flow rate of the first settling basin sludge 101 is constant value operation or proportional to the flow rate measurement value of the sewage 100. On the other hand, in this embodiment, the flow rate of the first settling basin sludge 101 is controlled according to the flow rate of the future sewage 100, which is larger than the current value. Therefore, more initial sedimentation basin sludge 101 can be extracted from the initial sedimentation basin 4 as compared with normal operation. As a result, the abundance of the first settling basin sludge 101 in the first settling basin 4 is reduced to ensure solid-liquid separation performance, the discharge load of suspended substances during simple treatment discharge is reduced, and the disinfection effect is ensured. Can be done.

In this embodiment, the water treatment apparatus 2 in which the standard activated sludge method is introduced is assumed. However, for example, the anaerobic activated sludge method and the circulating nitrification denitrification method are provided with a first settling basin and a final settling basin. Any treatment method using activated sludge can be applied in the same manner.
Further, in this embodiment, the flow meter 12 is initially installed on the upstream side of the settling basin 4, but the present invention is not limited to this. For example, the flow meter 12 may be installed between the first settling basin 4 and the aerobic tank (reaction tank) 5.
In this embodiment, the sludge extraction amount control unit 17 first controls the flow rate of the settling basin sludge 101, but the flow rate of the returned sludge 103 and the flow rate of the excess sludge 105 may be controlled. At that time, the rotation speed of the return pump 10 and the excess sludge pump 11 is controlled. Further, the sludge extraction amount control unit 17 may first control the flow rate of the settling basin sludge 101, and also control the flow rate of the returned sludge 103 and the excess sludge 105.
In this embodiment, the sludge extraction amount control unit 17 first controls the flow rate of the settling basin sludge 101 so as to be proportional to the flow rate of the future sewage 100, but when the future increase in the flow rate of the sewage 100 is predicted. In addition, the function may be such that the flow rate of the settling basin sludge 101 is larger than that in the normal operation. Further, the upper limit value of the flow rate of the first settling basin sludge 101 may be set in consideration of the influence on the sludge treatment (not shown) in the subsequent stage.

Next, a modified example of the water treatment system 1 shown in FIG. 1 will be described. FIG. 4 is a schematic overall configuration diagram of a modified example of the water treatment system 1 shown in FIG. In Example 1 described above, when the predicted flow rate value of the future sewage 100 exceeds the flow rate reference value, the rotation speed of the first settling basin sludge pump 7 is increased so that the flow rate of the first settling basin sludge 101 becomes larger than usual. Controlled. On the other hand, the unsteady operation of the returned sludge 103 and the surplus sludge 105, including the first settling basin sludge 101, affects the biological treatment and sludge treatment, so it is desirable to keep it to the minimum necessary. Therefore, as shown in FIG. 4, in the water treatment system 1a which is a modification of the first embodiment, a UV meter 18 for measuring the organic substance concentration of the sewage 100 is installed as an inflow water quality estimation unit, and for example, a load such as a first flush is particularly applied. Only when a high inflow of sewage is expected, the sludge withdrawal amount from the first settling basin 4 or the final settling basin 6 is controlled to be increased.

In FIG. 4, the same components as those in the first embodiment are designated by the same reference numerals, and the description overlapping with the first embodiment will be omitted below. As shown in FIG. 4, the UV meter 18 is first installed on the upstream side of the settling basin 4 and measures the water quality of the sewage 100. The measured water quality of the sewage 100 is output to the water treatment control device 3a via the signal line. The flow meter 12 measures the flow rate of the sewage (water to be treated) 100 that first flows into the settling basin 4. The measured flow rate of the sewage 100 is output to the water treatment control device 3a described later via the signal line. The return sludge flow meter 19 is installed in the flow path of the return sludge 103 and measures the flow rate of the return sludge 103. The measured flow rate of the returned sludge 103 is output to the water treatment control device 3a via the signal line.

(Configuration of water treatment control device 3a)
FIG. 5 is a functional block diagram of the water treatment control device 3a shown in FIG. As shown in FIG. 5, the water treatment control device 3a includes a rainfall information acquisition unit 14, an inflow sewage amount prediction unit 15, a sludge extraction amount control unit 17a, a communication I / F23, a measured value acquisition unit 24, and a sewage flow rate time change database. 25, the rainfall-inflow water amount correlation database 26, the input I / F27, and the output I / F28 are provided, and these are connected to each other via the internal bus 31. Further, the input I / F 27 is connected to the input unit 29, and takes in the load reference value of the sewage 100 and the like input via the input unit 29. The output I / F 28 is connected to the display unit 30, and the display unit 30 displays desired information on the screen, for example, various set values or precipitation information in the processing area as needed. Although not shown, the water treatment control device 3a also has a function of controlling the blower 9 in order to control the amount of aerated air supplied to the aerobic tank (reaction tank) 5 via the air diffuser 8. There is.

The sewage flow rate time change database 25 stores past actual data, and for example, the sewage flow rate according to the time zone on a daily basis, and the time change of the sewage flow rate for each season on a yearly basis, for example. It is stored in association with each other.
Further, the rainfall-inflow water amount correlation database 26 stores the rainfall information such as the rainfall amount in the treatment area measured by the rain gauge 13 in the past and the inflow water amount of the sewage in association with each other. A rainfall radar may be used instead of the rain gauge 13.

The measurement value acquisition unit 24 first communicates the flow rate measurement value of the sewage 100 measured by the flow meter 12 and the UV meter 18 installed on the upstream side of the settling basin 4 and the measurement value of the concentration of the pollutant which is the water quality. Obtained via / F23 and internal bus 31. Further, the measured value acquisition unit 24 acquires the flow rate measurement value of the return sludge 103 measured by the return sludge flow meter 19 installed in the flow path of the return sludge 103 via the communication I / F 23 and the internal bus 31. The measured value acquisition unit 24 performs a process such as noise removal on the acquired flow rate measurement value of the sewage 100 and transfers it to the inflow sewage amount prediction unit 15 via the internal bus 31. Further, the measured value acquisition unit 24 performs a process such as noise removal on the measured value of the concentration of the polluted substance which is the water quality of the acquired sewage 100, and sends the measured value to the inflow sewage amount prediction unit 15 via the internal bus 31. Forward. Further, the measured value acquisition unit 24 performs a process such as noise removal on the acquired flow rate measurement value of the returned sludge 103 and transfers it to the sludge extraction amount control unit 17a via the internal bus 31.

The rainfall information acquisition unit 14 acquires rainfall information such as the amount of rainfall in the processing area measured by the rain gauge 13 via the communication I / F23 and the internal bus 31. Then, the rainfall information acquisition unit 14 transfers the acquired rainfall information such as the amount of rainfall in the processing area to the inflow sewage amount prediction unit 15 via the internal bus 31.

The inflow sewage amount prediction unit 15 includes a flow rate measurement value of the sewage 100 transferred from the measurement value acquisition unit 24 (measured flow rate of the sewage 100), a rainfall amount in the treatment area transferred from the rainfall information acquisition unit 14, and the like. Based on the rainfall information of, the future flow rate of sewage 100 is predicted. The inflow sewage amount prediction unit 15 transfers the predicted future flow rate of the sewage 100 to the sludge extraction amount control unit 17a via the internal bus 31. In addition, the load, the flow rate, and the water quality have a relationship of load = flow rate × water quality. The inflow sewage amount prediction unit 15 multiplies the measured value of the flow rate of the sewage 100 transferred from the measurement value acquisition unit 24 (the measured flow rate of the sewage 100) by the measured value of the concentration of the pollutant which is the water quality, so that the sewage is sewage. The inflow load of 100 pollutants is calculated, and the concentration of pollutants in future sewage 100 is predicted. Further, the inflow sewage amount prediction unit 15 predicts the inflow load of pollutants in the future sewage 100. The inflow load of pollutants in the future sewage 100 predicted by the inflow sewage amount prediction unit 15 is transferred to the sludge extraction amount control unit 17a via the internal bus 31.

The sludge withdrawal amount control unit 17a of the returned sludge 103 is based on the flow rate of the future sewage 100 predicted by the inflow sewage amount prediction unit 15 transferred via the internal bus 31 and the inflow load of the pollutant substance of the future sewage 100. Set the flow rate. Then, the sludge extraction amount control unit 17a determines the rotation speed of the return pump 10 so that the measured value by the return sludge flow meter 19 becomes equal to the set value, and issues a rotation speed command of the return pump 10 to the internal bus 31 and By outputting to the return pump 10 via the output I / F 28, the flow rate of the return sludge 103 is controlled.

(Operation of water treatment control device 3a)
Next, the operation of the water treatment control device 3a, that is, the flow rate control method of the returned sludge 103 will be described.
FIG. 6 is a control flow diagram of the returned sludge by the water treatment control device 3a shown in FIG. As shown in FIG. 6, in step S201, the load reference value ( _{Lin_up} ) of the sewage 100 is set via the input unit 29 with reference to the planned amount of water and the like.
Next, in step S202, the inflow sewage amount prediction unit 15, the flow rate measurement value of the sewage 100 by the flow meter 12 _(Q in _(t)) and the measured value of the concentration of pollutants in the sewage 100 by UV meter 18 _{(C in} (T)) is acquired from the measured value acquisition unit 24 via the internal bus 31, and precipitation information such as the amount of rainfall in the processing area is acquired from the rainfall information acquisition unit 14 via the internal bus 31.

In step S203, the inflow sewage amount prediction unit 15 adds the acquired flow rate measurement value (Q _{in (t)) of the sewage 100 to the water quality (C in} (t)) which is the measurement value of the concentration of pollutants in the UV meter 18. by multiplying the calculated inflow load of pollutants of the sewage _{100 (L in (t))} .
In step S204, the inflow sewage amount prediction unit 15 compares the inflow load of sewage _{100 (L in (t))} , load value of the sewage 100 that has been set at step S201 described above and _{(L in_up).} As a result of the comparison, the inflow load of sewage 100 _(L in (t)) is in the case of more basic load value of the sewage _{100 (L} in_up) proceeds to step S205, were performed at predetermined rain processing (simple process effluent) The process returns to step S202. On the other hand, as a result of comparison, if the inflow load (L _in (t)) of the sewage 100 _{is less than the load reference value (L in_up} ) of the sewage 100, the process proceeds to step S206.

In step S206, the inflow sewage amount prediction unit 15 receives the flow rate measurement value (Q _in (t)) of the sewage 100 transferred from the measurement value acquisition unit 24 via the internal bus 31 and the rainfall information via the internal bus 31. Based on the rainfall information such as the amount of rainfall in the treatment area transferred from the acquisition unit 14, the flow rate of future sewage 100 (Q _in (t + n · Δt)) and the water quality (C _in (t + n · Δt)) which is the concentration of pollutants. )) Predict.
In step S207, the inflow sewage amount prediction unit 15, flows into the load of pollutants future sewage _{100 (L in (t + n} · Δt)) to predict. _{Specifically, the water quality (C in} (t + n · Δt)), which is the concentration of pollutants in the future sewage 100, is added to the flow rate (Q _in (t + n · Δt)) of the future sewage 100 obtained in step S206. We are multiplying, the inflow load of pollutants in the future of sewage _{100 (L in (t + n} · Δt)) is calculated. Then, the inflow load of pollutants of the sewage 100 in the resulting future _{(L in (t + n ·} Δt)) is transferred through the internal bus 31 to the sludge extraction amount control unit 17a.

In step S208, the sludge extraction amount control unit 17a of which is the inflow load of pollutants of the sewage 100 in the predicted future transferred from the inflow sewage amount prediction unit 15 via the internal bus _{31 (L in (t + n} · Δt _{)) Is} compared with the load reference value (Lin_up) of the sewage 100. Result of the comparison, if the inflow load of pollutants future sewage _{100 (L in (t + n} · Δt)) is less than the load reference value sewage _{100 (L} in_up) proceeds to step S209, and performed normal processing The process returns to step S202. On the other hand, the result of the comparison, if the inflow load of pollutants future sewage _{100 (L in (t + n ·} Δt)) is exceeded load value of the sewage 100 _{(L in_up)} proceeds to step S210.
In step S210, the sludge extraction amount control unit 17a uses the following equation (2) to obtain the flow rate of _{the returned sludge 103 (Q r} (Q r (t + n · Δt)) in proportion to _{the flow rate (Q in (t + n · Δt)) of the future sewage 100.} t + Δt)) is set.

Next, in step S211 the sludge extraction amount control unit 17a determines the rotation speed of the return pump 10 so that the _{value measured by the return sludge flow meter 19 becomes equal to the set value (Qr (t + Δt)), and returns the sludge.} The rotation speed command of the pump 10 is output to the return pump 10 via the internal bus 31 and the output I / F 28, and the process returns to step S202.

Generally, the flow rate of the returned sludge 103 is proportional to the constant value operation or the flow rate measurement value of the sewage 100. On the other hand, the water treatment control device 3a according to the modified example of the first embodiment controls the flow rate of the returned sludge 103 according to the flow rate of the future sewage 100, which is larger than the current flow rate. Therefore, more returned sludge 103 can be transferred from the final settling basin 6 to the aerobic tank (reaction tank) 5 as compared with the normal operation. As a result, although temporarily, the abundance of activated sludge in the final settling basin 6 is reduced, and the concentration of activated sludge in the aerobic tank (reaction tank) 5, especially the aerobic tank (reaction tank) 5 on the upstream side. Can be enhanced. As a result, the risk of activated sludge flowing into the treated water 104 can be reduced, and the biological treatment capacity can be increased.
In addition, the amount of sludge withdrawn from the first settling basin 4 and / or the final settling basin 6 can be controlled to increase only when the inflow of sewage with a particularly high load is expected, and the effect on biological treatment and sludge treatment is minimized. It can be limited.

In the modified example of Example 1, the UV meter 18 was used as the inflow water quality estimation unit, but any device such as a COD meter that can estimate and measure the concentration of organic matter may be used. Further, a database storing the water quality fluctuation of the sewage 100 in fine weather or rainy weather may be utilized. Further, in the modified example of Example 1, an organic substance is used as a pollutant, but nitrogen, phosphorus, or the like may be used as a blade, for example, an ammonia meter may be used as an inflow water quality estimation unit.
In the water treatment control device 3a according to the modified example of the first embodiment, the sludge extraction amount control unit 17a controlled the flow rate of the returned sludge 103 so as to be proportional to the flow rate of the future sewage 100. Any function may be used as long as the flow rate of the returned sludge 103 is larger than that in normal operation when an increase in the flow rate of the sludge is predicted. Further, in the water treatment control device 3a according to the modified example of the first embodiment, the flow rate of the returned sludge 103 was controlled based on the equation (2), but the appropriate range of the activated sludge concentration of the aerobic tank (reaction tank) 5 was set. Then, from the flow rate of the first settling pond runoff water 102 and the activated sludge concentration of the returned sludge 103 so that the activated sludge concentration after mixing the first settling pond runoff water 102 and the returned sludge 103 is within the set appropriate range. The upper and lower limits of the flow rate of the returned sludge 103 may be set.

As described above, according to the present embodiment, even when the inflow flow rate of sewage (water to be treated) suddenly increases, water that can reduce the discharge pollution load while ensuring the maximum amount of biological treatment. It becomes possible to provide a treatment control device and a water treatment system.
Further, according to this embodiment, an increase in the inflow amount of sewage (treated water) is predicted by using rainfall information and the like, and the sludge withdrawal amount from the settling basin is controlled in advance, as compared with the normal operation. More initial sedimentation basin sludge can be withdrawn from the initial sedimentation basin. As a result, the abundance of sludge in the first settling basin in the first settling basin can be reduced to ensure solid-liquid separation performance, the discharge load of suspended substances during simple treatment discharge can be reduced, and the disinfection effect can be ensured. ..
Further, according to this embodiment, an increase in the inflow of sewage (treated water) is predicted by using rainfall information and the like, and the flow rate of the returned sludge is controlled in advance, so that the operation is more than normal operation. A large amount of returned sludge can be transferred from the final settling basin to the aerobic tank (reaction tank). This will temporarily reduce the abundance of activated sludge in the final settling basin and increase the concentration of activated sludge in the aerobic tank (reaction tank), especially in the upstream aerobic tank (reaction tank). Can be done. As a result, the risk of activated sludge flowing into the treated water can be reduced and the biological treatment capacity can be increased.

FIG. 7 is a schematic overall configuration diagram of the water treatment system of the second embodiment according to another embodiment of the present invention, and FIG. 8 is a functional block diagram of the water treatment control device shown in FIG. 7. In the first embodiment described above, the water treatment control device 3 predicts the flow rate of the future sewage 100 based on the rainfall information, and controls the flow rates of the first settling basin sludge 101 and / or the returned sludge 103 and the surplus sludge 105. It was configured. On the other hand, in this example, in addition to the configuration of Example 1, sludge from the final settling basin 6 is based on the measured values of the activated sludge concentration in the aerobic tank (reaction tank) 5 and the returned sludge 103 (surplus sludge 105). The difference from Example 1 is that the withdrawal flow rate is controlled to surely reduce the abundance of activated sludge in the final settling basin 6 prior to the increase in the inflow amount due to rainy weather. The same components as in the first embodiment are designated by the same reference numerals, and a part of the description overlapping with the first embodiment will be omitted below.

As shown in FIG. 7, the water treatment control device 3b according to the present embodiment controls the flow rate of the surplus sludge 105 by controlling the rotation speed of the surplus sludge pump 11.
The MLSS meter 20 is installed in the aerobic tank (reaction tank) 5 on the downstream side of the aerobic tank (reaction tank) 5 as an MLSS measuring unit, in other words, in the final stage aerobic tank (reaction tank) 5, and the aerobic tank (reaction tank) 5 is installed. Measure the concentration of activated sludge inside. The measured activated sludge concentration in the aerobic tank (reaction tank) 5 is output to the water treatment control device 3b described later via the signal line. The returned sludge concentration meter 21 is installed in the flow path from the final settling basin 6 to the aerobic tank (reaction tank) 5 as a drawn sludge concentration estimation unit, and measures the activated sludge concentration of the returned sludge 103. The measured activated sludge concentration of the returned sludge 103 is output to the water treatment control device 3b via the signal line. The activated sludge concentration of the surplus sludge 105 is the same as the activated sludge concentration of the returned sludge 103. That is, the returned sludge 103 and the surplus sludge 105 have the same activated sludge concentration and differ only in the flow rate.
The surplus sludge flow meter 22 is installed in the flow path of the surplus sludge 105 and measures the flow rate of the surplus sludge 105. The measured flow rate of the excess sludge 105 is output to the water treatment control device 3b via the signal line.

(Configuration of water treatment control device 3b)
As shown in FIG. 8, the water treatment control device 3b includes a rainfall information acquisition unit 14, an inflow sewage amount prediction unit 15, a sludge extraction amount control unit 17a, a communication I / F23, a measured value acquisition unit 24, and a sewage flow rate time change database. 25, the rainfall-inflow water amount correlation database 26, the input I / F27, and the output I / F28 are provided, and these are connected to each other via the internal bus 31. Further, the input I / F 27 is connected to the input unit 29 and takes in the flow rate reference value of the sewage 100 input via the input unit 29. The output I / F 28 is connected to the display unit 30, and the display unit 30 displays desired information on the screen, for example, various set values or precipitation information in the processing area as needed. Although not shown, the water treatment control device 3b also has a function of controlling the blower 9 in order to control the amount of aerated air supplied to the aerobic tank (reaction tank) 5 via the air diffuser 8. There is.

The sewage flow rate time change database 25 stores past actual data, and for example, the sewage flow rate according to the time zone on a daily basis, and the time change of the sewage flow rate for each season on a yearly basis, for example. It is stored in association with each other.
Further, the rainfall-inflow water amount correlation database 26 stores the rainfall information such as the rainfall amount in the treatment area measured by the rain gauge 13 in the past and the inflow water amount of the sewage in association with each other. A rainfall radar may be used instead of the rain gauge 13.

The measurement value acquisition unit 24 first acquires the flow rate measurement value of the sewage 100 measured by the flow meter 12 installed on the upstream side of the settling basin 4 via the communication I / F 23 and the internal bus 31. Further, the measured value acquisition unit 24 transmits the activated sludge concentration in the aerobic tank (reaction tank) 5 measured by the MLSS meter 20 installed in the aerobic tank (reaction tank) 5 in the final stage. Obtained via F23 and internal bus 31. Further, the measurement value acquisition unit 24 transmits the flow rate measurement value and the activated sludge concentration of the return sludge 103 measured by the return sludge flow meter 19 and the return sludge concentration meter 21 installed in the flow path of the return sludge 103. Obtained via F23 and internal bus 31. Further, the measured value acquisition unit 24 acquires the flow rate measurement value of the surplus sludge 105 measured by the surplus sludge flow meter 22 installed in the flow path of the surplus sludge 105 via the communication I / F 23 and the internal bus 31. ..
The measurement value acquisition unit 24 performs a process such as noise removal on the acquired flow rate measurement value of the sewage 100 and transfers it to the inflow sewage amount prediction unit 15 via the internal bus 31. In addition, the measurement value acquisition unit 24 has the activated sludge concentration in the acquired aerobic tank (reaction tank) 5, the flow measurement value of the returned sludge 103, the activated sludge concentration of the return sludge 103, and the flow measurement value of the excess sludge 105. On the other hand, for example, it is subjected to processing such as noise removal and transferred to the sludge extraction amount control unit 17b via the internal bus 31.

The rainfall information acquisition unit 14 acquires rainfall information such as the amount of rainfall in the processing area measured by the rain gauge 13 via the communication I / F23 and the internal bus 31. Then, the rainfall information acquisition unit 14 transfers the acquired rainfall information such as the amount of rainfall in the processing area to the inflow sewage amount prediction unit 15 via the internal bus 31.

The inflow sewage amount prediction unit 15 includes a flow rate measurement value of the sewage 100 transferred from the measurement value acquisition unit 24 (measured flow rate of the sewage 100), a rainfall amount in the treatment area transferred from the rainfall information acquisition unit 14, and the like. Based on the rainfall information of, the future flow rate of sewage 100 is predicted. The inflow sewage amount prediction unit 15 transfers the predicted future flow rate of the sewage 100 to the sludge extraction amount control unit 17a via the internal bus 31.

The sludge extraction amount control unit 17b has the activated sludge concentration in the aerobic tank (reaction tank) 5 transferred from the measured value acquisition unit 24, the activated sludge concentration of the returned sludge 103, and the inflow transferred via the internal bus 31. The flow rate of the surplus sludge 105 is set based on the flow rate of the future sewage 100 predicted by the sewage amount prediction unit 15. Then, the sludge extraction amount control unit 17b determines the rotation speed of the surplus sludge pump 11 so that the measured value by the surplus sludge flow meter 22 becomes equal to the set value, and issues a rotation speed command of the surplus sludge pump 11 to the internal bus. The flow rate of the surplus sludge 105 is controlled by outputting to the surplus sludge pump 11 via the 31 and the output I / F 28.

(Operation of water treatment control device 3b)
Next, the operation of the water treatment control device 3b, that is, the flow rate control method of the excess sludge 105 will be described.
FIG. 9 is a flow rate control flow diagram of excess sludge by the water treatment control device 3b shown in FIG. As shown in FIG. 9, in step S301, the flow rate reference value (Q _{in_up} ) of the sewage 100 is set via the input unit 29 with reference to the planned water volume and the like.
Next, in step S302, the inflow sewage amount prediction unit 15 determines the flow rate measurement value (Q _in (t)) of the sewage 100 by the flow meter 12 and the activated sludge concentration in the aerobic tank (reaction tank) 5 by the MLSS meter 20. (X (t)) and the activated sludge concentration (Xr (t)) of the returned sludge 103 (surplus sludge 105) by the returned sludge concentration meter 21 are acquired from the measured value acquisition unit 24 via the internal bus 31 and processed. Rainfall information such as the amount of rainfall in the area is acquired from the rainfall information acquisition unit 14 via the internal bus 31.

In step S303, the inflow sewage amount prediction unit 15 compares the flow rate measurement value (Q _in (t)) of the sewage 100 with the flow rate reference value (Q _{in_up} ) of the sewage 100 set in step S301 described above. As a result of the comparison, if the flow rate measurement value (Q _in (t)) of the sewage 100 _{is equal to or higher than the flow rate reference value (Q in_up} ) of the sewage 100, the process proceeds to step S304, and the predetermined rainy weather treatment (simple treatment discharge) is performed. After that, the process returns to step S302. On the other hand, as a result of comparison, if the flow rate measurement value (Q _in (t)) of the sewage 100 _{is less than the flow rate reference value (Q in_up} ) of the sewage 100, the process proceeds to step S305.

In step S305, the inflow sewage amount prediction unit 15 receives the flow rate measurement value (Q _in (t)) of the sewage 100 transferred from the measurement value acquisition unit 24 via the internal bus 31 and the rainfall information via the internal bus 31. _{The future flow rate of the sewage 100 (Q in} (t + n · Δt)) is predicted based on the rainfall information such as the amount of rainfall in the treatment area transferred from the acquisition unit 14.
Next, in step S306, the sludge extraction amount control unit 17b sewage the predicted future sewage 100 flow rate (Q _in (t + n · Δt)) transferred from the inflow sewage amount prediction unit 15 via the internal bus 31. Compare with the flow rate reference value (Q _{in_up) of 100.} As a result of the comparison, if the predicted future flow rate of the sewage 100 (Q _in (t + n · Δt)) is _{equal to or less than the flow rate reference value (Q in_up} ) of the sewage 100, the process proceeds to step S307, and after performing the normal treatment. Return to step S302. On the other hand, as a result of comparison, if the predicted future flow rate of the sewage 100 (Q _in (t + n · Δt)) exceeds the flow rate reference value (Q _{in_up} ) of the sewage 100, the process proceeds to step S308.

In step S308, the sludge extraction amount control unit 17b determines the future flow rate of sewage 100 (Q _in (t + n · Δt)) and the activated sludge concentration (X (t)) in the aerobic tank (reaction tank) 5 by the MLSS total 20. )) And the flow rate (Qe (t + Δt)) of the surplus sludge 105 is set based on the activated sludge concentration (Xr (t)) of the returned sludge 103 (surplus sludge 105) by the return sludge concentration meter 21. For example, the amount of activated sludge inflow into the final settling basin 6 in the future is the flow rate of sewage 100 in the future (Q _in (t + n · Δt)) and the concentration of activated sludge in the aerobic tank (reaction tank) 5 by the MLSS total 20 (Q in (t + n · Δt)). It is represented by the product of X (t)). Assuming that the amount of activated sludge flowing into the final settling basin 6 in the future and the amount of sludge drawn out from the final settling basin 6 are equal, the following equation (3) holds.

When the flow rate (Qe (t + Δt)) of the surplus sludge 105 is derived from the equation (3), the relationship of the equation (4) is established.

Further, since the predicted flow rate value (Qr (t + n · Δt)) of the returned sludge 103 _{is proportional to the flow rate (Q in} (t + n · Δt)) of the future sewage 100, the following equation (5) holds.

Therefore, the sludge withdrawal amount control unit 17b uses the equations (4) and (5) to make the amount of activated sludge inflow into the final settling basin 6 in the future equal to the amount of sludge withdrawn from the final settling basin 6. The flow rate (Qe (t + Δt)) of the surplus sludge 105 is calculated.

Next, in step S309, the sludge extraction amount control unit 17b determines the rotation speed of the surplus sludge pump 11 so that the value measured by the surplus sludge flow meter 22 becomes equal to the set value (Qe (t + Δt)), and the surplus sludge pump 11. The rotation speed command of the sludge pump 11 is output to the surplus sludge pump 11 via the internal bus 31 and the output I / F 28, and the process returns to step S302.

In general, the surplus sludge 105 is often extracted in a certain amount at regular intervals. On the other hand, in this embodiment, by installing the MLSS meter 20 and the return sludge concentration meter 21, more activated sludge is produced than the amount of activated sludge flowing into the final settling basin 6 when the flow rate of the sewage 100 in rainy weather increases. It can be pulled out from the final settling basin 6. As a result, the risk of activated sludge flowing into the treated water 104 can be reliably reduced.

In this embodiment, the returned sludge concentration meter 21 is installed. For example, the amount of sewage flowing into the aerobic tank (reaction tank) 5, the flow rate of the returned sludge 103, and the aerobic tank (reaction tank) 5 The structure may be such that the activated sludge concentration of the returned sludge 103 is estimated from the activated sludge concentration.
In this embodiment, the flow rate of the surplus sludge 105 was controlled based on the formula (4), but the extraction of the surplus sludge 105 more than necessary reduces the abundance of activated sludge in the water treatment device 2b and the biological treatment capacity. May lead to a significant decrease in. Therefore, an upper limit of the withdrawal amount of the surplus sludge 105 may be set, and the flow rate of the surplus sludge 105 may be controlled based on the set value.

As described above, according to the present embodiment, in addition to the effect of the first embodiment, more active sludge is extracted from the final settling basin than the amount of activated sludge flowing into the final settling basin when the flow rate of sewage increases in rainy weather. However, it is possible to reliably reduce the risk of activated sludge flowing into the treated water.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.

1,1a, 1b ... Water treatment system 2,2a, 2b ... Water treatment device 3,3a, 3b ... Water treatment control device 4 ... First settling basin 5 ... Aerobic tank (reaction tank)
6 ... Final settling pond 7 ... First settling pond sludge pump 8 ... Air diffuser 9 ... Blower 10 ... Return pump 11 ... Excess sludge pump 12 ... Flow meter 13 ... Rain meter 14 ... Rainfall information acquisition unit 15 ... Inflow sewage amount prediction unit 16 ... First settling pond sludge flow meter 17, 17a, 17b ... Sludge extraction amount control unit 18 ... UV meter 19 ... Return sludge flow meter 20 ... MLSS meter 21 ... Return sludge concentration meter 22 ... Excess sludge flow meter 23 ... Communication I / F
24 ... Measured value acquisition unit 25 ... Sewage flow rate time change database 26 ... Rainfall-inflow water amount correlation database 27 ... Input I / F
28 ... Output I / F
29 ... Input unit 30 ... Display unit 31 ... Internal bath 100 ... Sewage 101 ... First settling basin sludge 102 ... First settling basin runoff 103 ... Return sludge 104 ... Treated water 105 ... Surplus sludge 106 ... Settled and separated activated sludge

Claims (4)

At least, a first settling basin that sediments and separates solids contained in sewage that is the water to be treated, a reaction tank that treats part or all of the effluent flowing out of the first settling basin with activated sludge, and the reaction tank. A water treatment control device that controls a water treatment device having a final settling basin that settles and separates the outflow water into activated sludge and treated water.
Precipitation information acquisition department that acquires rainfall information,
An inflow sewage amount prediction unit that predicts the inflow amount of the sewage based on the rainfall information,
A sludge withdrawal amount control unit for controlling the sludge withdrawal amount from the first settling basin and / or the sludge withdrawal amount from the final settling basin based on the predicted value of the inflow sewage amount prediction unit is provided .
The sludge extraction amount control unit determines the activated sludge concentration into the final settling basin based on the activated sludge concentration measured by the MLSS measuring unit installed in the reaction tank and the inflow amount of sewage predicted based on the rainfall information. Find the predicted value of inflow and
Based on the predicted value of the inflow of activated sludge to the activated sludge concentration and the settling tank in extracted sludge from the settling tank which is measured by the sludge concentration meter that controls the extracted sludge amount from the settling tank A water treatment control device characterized by the fact that. In the water treatment control device according to claim 1,
A water treatment control device characterized in that the sludge drawn from the final settling basin is excess sludge and / or returned sludge returned from the final settling basin to the reaction tank. At least, the first sedimentation basin that sediments and separates the solids contained in the sewage that is the water to be treated,
Water treatment having a reaction tank in which part or all of the effluent flowing out of the first sedimentation basin is treated with activated sludge, and a final sedimentation basin in which the effluent flowing out of the reaction tank is settled and separated into activated sludge and treated water. Equipment and
A rainfall information acquisition unit that acquires rainfall information, an inflow sewage amount prediction unit that predicts the inflow of sewage based on the rainfall information, and a sludge extraction from the first settling basin based on the predicted values of the inflow sewage amount prediction unit. A water treatment control device having a sludge withdrawal amount control unit for controlling the amount and / or the amount of sludge withdrawn from the final settling basin.
The water treatment apparatus includes an MLSS measuring unit installed in the reaction tank and a sludge concentration meter for measuring the activated sludge concentration in the sludge drawn from the final settling basin.
The sludge extraction amount control unit is
Based on the activated sludge concentration measured by the MLSS measuring unit and the inflow of sewage predicted based on the rainfall information, the predicted value of the inflow of activated sludge into the final settling basin was obtained.
A water treatment system characterized in that the amount of sludge drawn from the final settling basin is controlled based on the predicted value of the activated sludge concentration measured by the sludge concentration meter and the amount of activated sludge flowing into the final settling basin. In the water treatment system according to claim 3 ,
The final extracted sludge from sedimentation pond, water treatment system, wherein return sludge der Rukoto returned from excess sludge and / or the settling tank to the reaction vessel.

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