JP2020110747A - Water treatment system - Google Patents

Abstract

To provide a water treatment system that grasps sludge settling conditions and sludge outflow trends at an earlier stage and provides feedback to operation control.SOLUTION: There is provided a water treatment control device for controlling a water treatment device, including: a reaction tank that treats a part or all of a sewage that is water to be treated with an activated sludge; a final sedimentation tank for settling and separating runoff water from the reaction tank into activated sludge and treated water; a floating sludge concentration estimation unit for estimating a floating sludge concentration in the final sedimentation tank; a sludge concentration estimation unit for estimating a sludge concentration of the treated water flowing out from the final sedimentation tank; and a manipulated variable calculator unit for calculating a manipulated variable of the water treatment device, based on at least one of the estimated value calculated by the floating sludge concentration estimation unit and the estimated value calculated by the treated water sludge concentration estimation unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a water treatment device using activated sludge.

Sewage treatment plants generally treat sewage according to the following procedures. First, the solid content in the sewage is removed in the sand basin/first sedimentation basin. The solids separated in the first settling tank are transferred to the sludge treatment as the first settling tank sludge. First, the effluent of the sedimentation tank removes organic matter, nitrogen, and phosphorus by the action of microorganisms (activated sludge) in the reaction tank. Then, the activated sludge is settled and separated in the final settling tank, and the supernatant water (hereinafter, treated water) is sterilized and discharged to the public water area. The activated sludge settled and separated in the final settling tank is returned to the reaction tank and used again for sewage treatment. In the combined sewer system that consolidates sewage and rainwater to the sewage treatment plant with the same pipe, sewage that exceeds the maximum planned wastewater volume is generally treated as simple treatment by first removing solids in the settling basin and then disinfecting it. After that, it is released to public water bodies.

Since such simple treated water is discharged without being biologically treated, there is a concern that the water quality in the discharge destination water area will deteriorate. Therefore, a method of activated sludge in rainy weather has been proposed in which the biological treatment amount is increased as much as possible and the simple treatment amount is decreased. (Non-patent document 1). In addition, in rainwater sewage treatment, in order to maximize the amount of biological treatment while controlling the outflow of activated sludge from the final settling basin, the sludge concentration of the treated water flowing out from the final settling basin is used to increase the amount of biological treatment. A method of controlling the inflow water amount, the aeration air amount, and the coagulant injection amount has been proposed (Patent Document 1).

JP, 2017-225918, A

Takahiro Yamamoto, 1 person from outside, “Improvement of combined sewer system using existing facilities in Osaka City”, Academic journal EICA, Japan Society for Measurement and Control of Environmental Systems, 2005, Volume 10, Issue 2, P.8-13

In the water treatment process described in Non-Patent Document 1, when the biological treatment amount, that is, the amount of inflow water into the reaction tank is excessively increased, the activated sludge does not sufficiently settle in the final settling tank and the activated sludge is discharged into the discharge water. May be leaked.

Further, in Patent Document 1, the operation of the water treatment process is feedback-controlled based on the sludge concentration measurement value of the treated water flowing out from the final settling basin. Therefore, although it is effective to secure the treated water quality by suppressing the sludge outflow, there is a concern that the sludge outflow risk cannot be reduced depending on the time delay of the feedback control.

The outflow of activated sludge may increase the environmental load on the public water area and may cause a decline in the subsequent treatment function. Therefore, it is an object of the present invention to provide a water treatment system that grasps sludge settling conditions and sludge outflow tendencies at an earlier stage and feeds them back to operation control.

In order to solve the above problems, the present invention is a reaction tank for treating a part or all of sewage to be treated with activated sludge, and the effluent from the reaction tank is separated into activated sludge and treated water. A water treatment control device for controlling a water treatment device having a final settling basin, wherein a floating sludge concentration estimating unit for estimating the floating sludge concentration of the final settling basin, and treated water flowing out from the final settling basin Based on at least one of the treated water sludge concentration estimation unit that estimates the sludge concentration, the estimated value calculated by the floating sludge concentration estimation unit, and the estimated value calculated by the treated water sludge concentration estimation unit, the water It is characterized by comprising an operation amount calculation unit for calculating an operation amount of the processing device.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the water treatment system which makes compatible both sludge outflow control and biological treatment amount increase stably.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is a block diagram which shows the structure of the water treatment apparatus S which concerns on Example 1. 5 is a control flow of the aerobic tank inflow water amount according to the first embodiment. It is a block diagram which shows the structure of the water treatment apparatus S which concerns on the modification of Example 1. FIG. 8 is a screen conceptual diagram of an operation amount display unit according to a modified example of the first embodiment. It is a block diagram which shows the structure of the water treatment apparatus S which concerns on Example 2. 9 is a conceptual diagram of a method of setting a floating sludge concentration upper limit value of a final settling tank 3 according to Example 2. FIG. 9 is a control flow of the aeration air volume to the aerobic tank 2 according to the second embodiment. It is a block diagram which shows the structure of the water treatment apparatus S which concerns on Example 3. FIG. 9 is a conceptual diagram of a method of determining an abnormal value of an estimated value of suspended sludge concentration according to a third embodiment.

Examples of the present invention will be described below. It should be noted that the following is merely an example of the embodiment, and the invention itself is not intended to be limited to the following specific contents.

Example 1 of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a configuration diagram illustrating a configuration of a water treatment system S1 according to the first embodiment. This water treatment system S1 is provided with a water treatment device S2 and a water treatment control device S3, and in the standard activated sludge method, organic matter and the like are removed using activated sludge.

(Structure of water treatment device)
As shown in FIG. 1, the water treatment device S2 includes, in order from the inflow side of the sewage 100, a first settling tank 1, an aerobic tank 2 which is a form of a reaction tank, and a final settling tank 3.

(First settling tank)
When the sewage 100, which is the water to be treated, flows into the first sedimentation basin 1 from, for example, a sand basin (not shown) via an inflow pipe, the solid content of the sewage 100 is separated by sedimentation. All or part of the separated supernatant water flows into the aerobic tank 2 as the aerobic tank inflow water 101. Some of the supernatant water may be discharged as simplified treated water 103 after undergoing a process such as disinfection.

(Aerobic tank)
In the aerobic tank 2, the aerobic tank inflow water 101 and the returned sludge 102 flow in, and the organic matter is oxidized by aerobic heterotrophic bacteria in the activated sludge. Further, an aeration unit 4 is installed in the aerobic tank 2. A blower 5 is connected to the air diffuser 4 to supply air.

(Final settling tank)
The final settling tank 3 is a facility for settling and separating the supernatant liquid and the activated sludge. The supernatant water after sedimentation and separation is discharged as treated water 104 to the outside of the system after disinfection. A part of the activated sludge that has been separated by settling is returned to the aerobic tank 2 by the return pump 6 as the return sludge 102, and is used again for a series of biological treatments.

(Sensor and control unit)
Next, the configurations of the sensor and the control unit according to the first embodiment will be described.

The first flow meter 7 is first installed on the upstream side of the sedimentation tank 1 and measures the flow rate of the sewage 100.

The second flow meter 8 is first installed in the flow path from the sedimentation tank 1 to the aerobic tank 2, and measures the flow rate of the aerobic tank inflow water 101.

The suspended sludge concentration estimation unit 9 is installed in the final settling tank 3. The suspended sludge concentration estimation unit 9 has an image pickup device such as a camera, acquires an image of sludge flocs floating in the upper layer of the final settling basin 3, and calculates the area ratio of the sludge flocs by image analysis. Then, the sludge concentration is estimated from the area ratio of the sludge flocs based on a preset estimation formula.

The SS densitometer 10, which is a treated water sludge concentration estimation unit, is installed downstream of the final settling tank 3 and measures the sludge concentration of the treated water 104.

The water treatment control device S3 includes an operation amount calculation unit 11, a first upper limit setting unit 12, a second upper limit setting unit 13, and an operation control unit 15.

The operation amount calculation unit 11 is connected to the first flow meter 7, the suspended sludge concentration estimation unit 9, and the SS concentration meter 10. Further, the manipulated variable calculating unit 11 sets a first upper limit setting unit 12 that sets an upper limit value of the suspended sludge concentration that is the concentration of the upper layer of the final settling basin 3, and a first upper limit value that sets the upper limit value of the sludge concentration of the treated water 104. 2 is connected to the upper limit setting unit 13. In the manipulated variable calculating unit 11, the estimated value by the suspended sludge concentration estimating unit 9, the measured value by the SS densitometer 10, and the upper limit values respectively set by the first upper limit setting unit 12 and the second upper limit setting unit 13 are set. Based on this, the flow rate of the aerobic tank inflow water 101 is set.

The movable weir 14 is installed in the flow path of the simplified treated water 103 that first flows out from the settling basin 1, and adjusts the flow rates of the aerobic tank inflow water 101 and the simplified treated water 103.

The operation control unit 15 is connected to the second flow meter 8 and the movable weir 14. The operation control unit 15 controls the weir height of the movable weir 14 so that the flow rate measurement value of the aerobic tank inflow water 101 measured by the flow meter 8 becomes the set value calculated by the operation amount calculation unit 11.

FIG. 2 shows a schematic control flow of the aerobic tank inflow water 101 according to the first embodiment.

First, in S101, the first upper limit setting unit 12 sets the suspended sludge concentration upper limit value (SS _{up_1} ) of the final settling tank 3, and the second upper limit setting unit 13 sets the sludge concentration upper limit value (SS _{up_2} ) of the treated water 104. Set. The sludge concentration upper limit value (SS _{up_2} ) of the treated water 104 is set based on the discharged water quality standard. The upper limit value (SS _{up_1} ) of the concentration of suspended sludge in the final sedimentation tank 3 can be _calculated from a preliminary survey to find out how much the suspended sludge concentration decreases from the installation position of the suspended sludge concentration estimation unit 9 to the outflow portion of the final sedimentation tank 3. A value that satisfies the sludge concentration upper limit value (SS _{up_2} ) of the treated water 104 is set using the grasped result.

In S102, the flow rate measurement value (Q(t)) of the sewage 100 measured by the first flow meter 7 is acquired.

In S103, the suspended sludge concentration estimated value (SS ₁ (t)) of the final sedimentation tank 3 calculated by the suspended sludge concentration estimation unit 9 and the sludge concentration measured value (SS _{2 of} the treated water 104 measured by the SS concentration meter 10 (SS ₂ (t)).

Steps S104 to S108 are a flow executed by the operation amount calculation unit 11. First, in S104, regarding the suspended sludge concentration of the final settling basin 3 and the sludge concentration of the treated water 104, the upper limit value set in S101 is compared with the estimated value or measured value acquired in S103, and feedback is performed based on each deviation. The flow rate upper limit value is calculated using the concept of control (PID control) (Q _{in_up_1} (t+Δt), Q _{in_up_2} (t+Δt)). Then, in S105, the flow rate upper limit value (Q _{in_up} (t+Δt)) of the aerobic tank inflow water 101 is calculated by weighted averaging them (see the equation (1)). Next, in S106, the calculated flow rate upper limit value (Q _{in_up} (t+Δt)) of the aerobic tank inflow water 101 is compared with the flow rate (Q(t)) of the sewage 100 acquired in S102 to determine the flow rate upper limit value. If (Q _{in_up} (t+Δt)) is small, the flow rate set value of the aerobic tank inflow water 101 at time t+Δt is set to Q _{in_up} (t+Δt) (S107). On the other hand, if the flow rate upper limit value (Q _{in_up} (t+Δt)) is large, the flow rate set value of the aerobic tank inflow water 101 at time t+Δt is set to Q(t) (S108).

In this example, in addition to the conventional treated water SS concentration, the floating sludge concentration of the final settling basin 3 is used, so that the sludge settling condition in the final settling basin on the upstream side is grasped, and the sludge settling/ The outflow status can be fed back to the operation control. As a result, it is possible to more stably realize the sludge outflow control and the biological treatment amount maximization, which are the problems in the sewage treatment in rainy weather. Further, as the suspended sludge concentration estimation unit 9, instead of the immersion type measuring instrument such as the conventional SS concentration meter, an imaging device such as a camera is used to estimate the sludge concentration in a non-contact manner with the sample to be measured. Compared with the measuring instrument, it is possible to suppress the attachment of dirt to the measuring instrument and reduce maintenance work such as cleaning.

In addition, in the present embodiment, the water treatment apparatus S2 in which the standard activated sludge method is introduced has been described, but the reaction tank and the final sedimentation basin such as the anaerobic aerobic activated sludge method and the circulation type nitrification denitrification method are used. Any processing method can be applied as long as it has it.

In the present embodiment, the first flowmeter 7 was first installed upstream of the settling tank 1, but it was installed between the first settling tank 1 and the flow path branch point of the simplified treated water 103, and the first settling tank outflow. The flow rate of water may be measured.

In the present embodiment, the number of the suspended sludge concentration estimating unit 9 installed is one, but the suspended sludge concentration estimating unit 9 may be installed at a plurality of points in the final settling tank 3. Moreover, you may estimate the floating sludge density|concentration of the multiple places of the final settling tank 3 as an imaging device provided with a swing mechanism and a moving mechanism. In these cases, set the upper limit of suspended sludge concentration at each location and calculate the upper limit of flow rate based on that. Then, the flow rate upper limit value of the aerobic tank inflow water 101 is set by weighting and averaging them.

Although the SS concentration meter 10 is used as the treated water sludge concentration meter in the present embodiment, it may be any as long as it can determine the outflow status of the activated sludge. For example, a mechanism including a sensor for measuring other items such as turbidity, a manual analysis value, and an imaging device like the suspended sludge concentration estimation unit 9 may be used.

In this example, in S104, the upper limit value set in S101 and the estimated value or measured value acquired in S103 are compared for the suspended sludge concentration of the final settling basin 3 and the sludge concentration of the treated water 104, respectively. Although the flow rate upper limit value is calculated based on the idea of feedback control (PID control) based on the deviation of, the calculation method of the flow rate upper limit value is not necessarily limited to this. For example, a correspondence table in which the flow rate upper limit values for the suspended sludge concentration of the final settling tank 3 and the sludge concentration of the treated water 104 are set is prepared, and the estimated value by the suspended sludge concentration estimating unit 9 and the measured value by the SS concentration meter 10 are set. The upper limit value of flow rate may be set.

In this example, in S105, the flow rate upper limit value calculated in S104 was weighted averaged to calculate the flow rate upper limit value of the aerobic tank inflow water 101, but the weighted average ratio does not necessarily have to be constant. Absent. For example, as the SS concentration of the treated water 104 increases, the value of the coefficient α in the equation (1) may be decreased so that the contribution of the flow rate upper limit value based on the SS concentration of the treated water 104 increases.

In the present embodiment, the operation amount calculation unit 11 calculates the aerobic tank inflow amount, but the extraction sludge amount from the final settling tank 3, the aeration air amount from the blower 5, and the coagulant injection amount may be calculated. .. The manipulated variable calculating unit 11 calculates the inflow flow rate and the aeration air flow rate so as to decrease as the floating sludge concentration in the final settling tank 3 and the sludge concentration in the treated water 104 increase. Is calculated to increase. Further, the control based on these calculated values is not limited to a single control, and a plurality of combinations may be combined.

<Modification of Example 1>
In Example 1, the weir height of the movable weir 14 was controlled by the operation control unit 15 based on the flow rate setting value of the aerobic tank inflow water 101 calculated by the operation amount calculation unit 11. However, depending on the equipment specifications of the sewage treatment plant, there is a possibility that the flow rate of the aerobic tank inflow water 101 and the like cannot be automatically controlled, and in that case, the administrator must manually operate. Therefore, in the modified example of the first embodiment, the operation amount of the water treatment process is displayed on the monitoring control screen. Hereinafter, differences from the first embodiment will be described.

The configuration of the water treatment device S2 according to the modification of the first embodiment is shown in FIG.

The operation amount display unit 16 is connected to the second flow meter 8, the suspended sludge concentration estimation unit 9, the SS concentration meter 10, the operation amount calculation unit 11, and the movable weir 14.

FIG. 4 shows an example of a screen display on the operation amount display unit 16. The manipulated variable display unit 16 estimates the floating sludge concentration in the final settling tank 3 by the floating sludge concentration estimating unit 9 and the upper limit value by the first upper limit setting unit, and measures the sludge concentration in the treated water 104 by the SS concentration meter 10. And the upper limit value by the second upper limit setting unit, the measured value by the second flow meter 8 and the upper limit value calculated by the operation amount calculation unit 11 regarding the flow rate of the aerobic tank inflow water 101, and the weir height of the movable weir 14 corresponding thereto. Displays the set value and the current value.

In the modification of the first embodiment, even when the operation amount of the water treatment process cannot be automatically controlled, the operation amount is displayed on the operation amount display unit 16 so that the administrator can appropriately control the water treatment process. Becomes

In Example 1, the floating sludge concentration upper limit value (SS _{up_1} ) of the final settling tank 3 was set as a fixed value, and the upper limit flow rate was calculated based on the deviation from the estimated value by the floating sludge concentration estimating unit 9. On the other hand, if the sludge sedimentation characteristics change compared to when the upper limit value is set, the set value of the suspended sludge concentration upper limit value (SS _{up_1} ) may be too large or too _small . Therefore, in Example 2, the correlation is extracted based on the actual value of the estimated value by the suspended sludge concentration estimation unit 9 and the measured value by the SS densitometer 10, and the suspended sludge concentration upper limit value ( SS _{up_1} ) is corrected.

Example 2 will be described with reference to FIGS. 5 and 6. Hereinafter, the points different from the first embodiment will be described, and the description common to the first embodiment will be omitted.

A configuration diagram of the water treatment device S2 according to the second embodiment is shown in FIG. While the flow rate of the aerobic tank inflow water 101 was controlled in the first embodiment, the second embodiment is characterized in that the aeration air amount to the aerobic tank 2, especially the terminal compartment is controlled.

The air flow valve 17 is installed in a pipe that connects the blower 5 and the end section of the aerobic tank 2, and is connected to the operation amount calculation unit 11.

The manipulated variable calculating unit 11 is connected to the suspended sludge concentration estimating unit 9, the SS densitometer 10, the first upper limit setting unit 12, the second upper limit setting unit 12, and the operation control unit 15. In the manipulated variable calculating unit 11, the estimated value by the suspended sludge concentration estimating unit 9, the measured value by the SS densitometer 10, and the upper limit values set by the first upper limit setting unit 12 and the second upper limit setting unit 13 are set. Based on this, the opening degree of the air volume valve 17 is set, and the operation control unit 15 controls the opening degree of the air volume valve 17.

FIG. 6 shows a conceptual diagram of a method for setting the upper limit value of the suspended sludge concentration in the final settling tank 3. The first upper limit setting unit 12 is connected to the suspended sludge concentration estimating unit 9 and the SS densitometer 10. The first upper limit setting unit 12 builds a correlation equation between the estimated value by the floating sludge concentration estimation unit 9 and the measured value by the SS concentration meter 10 in the past predetermined period, and corresponds to the sludge concentration upper limit value of the treated water 104. Set the upper limit of the concentration of suspended sludge in the final settling tank 3. The correlation equation between the estimated value by the floating sludge concentration estimation unit 9 and the measured value by the SS concentration meter 10 is updated every predetermined period.

FIG. 7 shows an outline of the control flow of the aeration air volume to the aerobic tank 2 according to the second embodiment.

In S201, the first upper limit setting unit 12 sets the upper limit value of suspended sludge concentration (SS _{up_1} ) in the final sedimentation tank 3, and the second upper limit setting unit 13 sets the upper limit value of sludge concentration in the treated water 104 (SS _{up_2} ). .. In addition, the minimum value (V _min ) of the opening of the air volume valve 17 is set.

In S202, the suspended sludge concentration estimation unit 9 obtains the estimated suspended sludge concentration of the final settling tank 3 (SS ₁ (t)) and the SS concentration meter 10 obtains the measured sludge concentration of the treated water 104 (SS ₂ (t)). To do.

In S203, the floating sludge concentration of the final settling tank 3 and the sludge concentration of the treated water 104 are compared with the upper limit value set in S201 and the estimated value or measured value acquired in S202. If either one exceeds the upper limit, the opening of the air volume valve 17 at time t+Δt is set to Vmin to reduce the aeration air volume to the terminal compartment of the aerobic tank 2 (S204). As a result, the activated sludge settles in the aerobic tank 2, and the amount of sludge flowing into the first settling tank 3 can be temporarily reduced. On the other hand, if the upper limit value is not exceeded, the opening degree of the air flow valve 17 is set according to the conventional method (S205).

In the present embodiment, by setting the upper limit value of the suspended sludge concentration of the final settling tank 3 from the relationship between the estimated value by the suspended sludge concentration estimating unit 9 in the past predetermined period and the measured value by the SS densitometer 10, Sludge settling characteristics can be reflected in the set value. When the concentration of suspended sludge in the final settling basin 3 or the concentration of sludge in the treated water 104 exceeds the upper limit value, the amount of aeration air to the end section of the aerobic tank 2 can be reduced and the sludge settling time can be secured. ..

In the present embodiment, in the first upper limit setting unit 12, the relationship between the estimated value by the suspended sludge concentration estimation unit 9 and the measured value by the SS densitometer 10 in the past predetermined period is linear as shown in FIG. Although it is expressed by a function, it is not limited to this. Further, the correlation diagram may be constructed in consideration of the residence time based on the amount of inflow water of the aerobic tank and the amount of sludge to be returned.

In the first and second embodiments, the floating sludge concentration estimating unit 9 including the image pickup device estimates the floating sludge concentration in the final settling basin 3, but an estimation error from the actual sludge concentration is a concern. Therefore, in the third embodiment, the relationship between the estimated value by the suspended sludge concentration estimating unit 9 and the measured value by the SS densitometer 10 is compared with the past and the latest situation, and the estimated value by the suspended sludge concentration estimating unit is calculated early. The presence or absence of abnormality is determined and displayed.

Example 3 will be described with reference to FIGS. 8 and 9.

FIG. 8 is a configuration diagram of the water treatment device S2 according to the third embodiment, and FIG. 9 is a conceptual diagram of an abnormality determination method of the estimated value of the floating sludge concentration estimation unit 9. Hereinafter, differences from the first and second embodiments will be described, and description common to the first and second embodiments will be omitted. In the third embodiment, as in the first embodiment, the aerobic tank inflow amount is controlled according to the flow of FIG.

The abnormality determination/display unit 18 is connected to the suspended sludge concentration estimation unit 9 and the SS densitometer 10, and stores the suspended sludge concentration estimated value of the final settling tank 3 and the sludge concentration measured value of the treated water 104. It The abnormality determination/display unit 17 updates the correlation equation between the concentration of suspended sludge in the final settling basin 3 and the concentration of sludge in the treated water 104 at a constant cycle from the data of the past predetermined period. Then, the calculated values of the sludge concentration of the treated water 104 when the predetermined suspended sludge concentration of the final settling basin 3 is input are compared with the latest correlation equation and the past correlation equation, and when the deviations exceed a certain value, it is determined as abnormal. Judges and displays that there is a possibility of abnormality.

In this embodiment, a decrease in the estimation accuracy of the suspended sludge concentration in the final settling basin 3, which is important input information in operation control, is detected early and displayed on the screen. As a result, the administrator can take appropriate measures such as comparison with the manual analysis value and correction of the estimation formula for the suspended sludge concentration, which contributes to stabilization of the treatment.

In the present embodiment, in the abnormality determination/display unit 18, the correlation formula between the estimated value of the suspended sludge concentration of the final settling tank 3 and the measured value of the sludge concentration of the treated water 104 is larger than the previous formula. Although it is determined as abnormal when there is a divergence, it is not necessarily limited to this. For example, the abnormality of the estimated value may be determined using a statistical analysis method combined with other items such as the flow rate of the aerobic tank inflow water 101 and the concentration of activated sludge in the aerobic tank 2.

S1 Water treatment system S2 Water treatment device S3 Water treatment control device 100 Sewage 101 First settling basin outflow 102 Return sludge 103 Treated water 104 Simple treated water 1 First settling basin 2 Aerobic tank 3 Final settling basin 4 Aeration section 5 Blower 6 Return pump 7 First flow meter 8 Second flow meter 9 Suspended sludge concentration estimation unit 10 SS concentration meter 11 Operation amount calculation unit 12 First upper limit setting unit 13 Second upper limit setting unit 14 Movable weir 15 Operation control unit 16 Operation amount display Part 17 Airflow valve 18 Abnormality judgment/display unit

Claims (9)

A reaction tank that treats part or all of the sewage that is the water to be treated with activated sludge,
A water treatment control device for controlling a water treatment device comprising a final settling tank for settling and separating outflow water from the reaction tank into activated sludge and treated water,
A floating sludge concentration estimation unit for estimating the floating sludge concentration of the final settling tank,
A treated water sludge concentration estimating unit for estimating the sludge concentration of the treated water flowing out from the final settling tank,
Based on at least one of the estimated value calculated by the floating sludge concentration estimation unit and the estimated value calculated by the treated water sludge concentration estimation unit, an operation amount calculation unit for calculating the operation amount of the water treatment device. A water treatment control device comprising: The operation amount calculation unit, the amount of aeration air to the reaction tank, the inflow water amount of the water to be treated, the coagulant injection amount to be introduced into the reaction tank or the final settling tank, the amount of sludge drawn from the final settling tank The water treatment control device according to claim 1, wherein at least one of them is calculated as a manipulated variable. The water treatment control device according to claim 1, wherein the floating sludge concentration estimation unit includes an imaging device. A first upper limit setting unit for setting an upper limit of the concentration of suspended sludge in the final settling tank,
A second upper limit setting unit for setting an upper limit value of the sludge concentration of the treated water flowing out from the final settling tank,
The manipulated variable calculating unit calculates a deviation between the estimated value calculated by the floating sludge concentration estimating unit and the upper limit setting value set by the first upper limit setting unit, and the estimation calculated by the treated water sludge concentration estimating unit. 4. The water according to claim 1, wherein the operation amount is calculated based on at least one of a value and a deviation between the upper limit setting value by the second upper limit setting unit. Processing controller. The first upper limit setting unit, based on the estimated value calculated by the floating sludge concentration estimation unit in the past predetermined period and the estimated value calculated by the treated water sludge concentration estimation unit in the past predetermined period, The water treatment control device according to claim 4, wherein an upper limit value of the suspended sludge concentration in the final settling tank is set. The water treatment control device according to any one of claims 1 to 5, further comprising an operation amount display unit that displays a calculated value calculated by the operation amount calculation unit. The water treatment control device according to any one of claims 1 to 6, further comprising: an operation control unit that controls an operation amount of the water treatment process based on a value calculated by the operation amount calculation unit. Based on the estimated value calculated by the floating sludge concentration estimation unit in the past predetermined period and the estimated value calculated by the treated water sludge concentration estimation unit in the past predetermined period, the floating sludge concentration of the final sedimentation tank The water treatment control device according to any one of claims 1 to 7, further comprising an abnormality determination unit that determines whether or not the estimated value is abnormal. A water treatment device comprising a reaction tank for treating a part or all of sewage to be treated with activated sludge, and a final settling basin for settling and separating outflow water from the reaction tank into activated sludge and treated water. ,
The floating sludge concentration estimation unit that estimates the floating sludge concentration of the final sedimentation tank, the treated water sludge concentration estimation unit that estimates the sludge concentration of the treated water flowing out from the final sedimentation tank, and the floating sludge concentration estimation unit Based on at least one of the estimated value and the estimated value calculated by the treated water sludge concentration estimation unit, a water treatment control device including an operation amount calculation unit that calculates an operation amount of the water treatment device,
A water treatment system comprising:

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