JP2003053375A - Device for controlling water quality - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for controlling water quality in which proper treatment to remove the water quality component can be efficiently performed at a low cost even when the concentration of the water quality component is remarkably changed in the objective water. SOLUTION: The device 1 for controlling the water quality is equipped with an aeration tank 3 having a treating mechanism 6 for the water quality component to remove the component in the objective water, and a first settling tank 2 is connected to the aeration tank 3. A second settling tank 4 is connected to the aeration tank 3, and a controlling device 5 is connected to the treating mechanism 6 of the water quality component. The first setting tank 2 is provided with an oxidation reduction potential meter 7 and the potential meter 7 is disposed in the preceding stage than the aeration tank 3. The aeration tank 3 is composed of an anaerobic part 3a, a non-oxygen part 3b and an aerobic part 3c. The treating mechanism 6 for the water quality component has a blower 11, an air distribution pipe 15 disposed in the aerobic part 3c, an air pipe 14 to connect the blower 11 and the air distributing pipe 15, an electric valve 12, and an air flow meter 13. The controlling device 5 has an operational part 23 to estimate the quality of the supplied water, an operational part 21 to determine the target value of the airflow, and a controlling part 22 of the airflow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality control device equipped with an aeration tank for removing water components such as nitrogen, phosphorus and organic substances in water to be treated, and more particularly to highly efficient and low cost removal of water components. The present invention relates to a water quality control device that can be performed.

[0002]

2. Description of the Related Art Conventionally, nitrogen in treated water such as sewage,
Water quality components such as phosphorus and organic matter have been removed using a water quality control device having an aeration tank.

FIG. 7 is a block diagram showing a conventional water quality control device.

As shown in FIG. 7, the water quality control device 1 is provided with an aeration tank 3 having a water quality component treatment mechanism 6 for removing water quality components such as nitrogen, phosphorus and organic substances in the water to be treated such as sewage. The first settling tank 2 is connected to the upstream side of the aeration tank 3 via a first water pipe 51, and the second setting tank 4 is connected to the downstream side of the aeration tank 3 via a second water pipe 52. Are connected.

A control device 5 for controlling the water quality component treatment mechanism 6 is attached to the water quality component treatment mechanism 6, and the aeration tank 3 measures the degree of oxidation and reduction of the water to be treated in the aeration tank 3. An oxidation-reduction potentiometer 7 (ORP meter) is provided.

In the aeration tank 3, an anaerobic part 3a for anaerobic treatment of the water to be treated, an anaerobic part 3b and an aerobic part 3c for aerobic treatment of the water to be treated are sequentially arranged from upstream to downstream. Is configured.

The aerobic part 3c and the anoxic part 3b of the aeration tank 3 are connected by a circulating water pipe 53 to which a circulation pump 54 is attached, and the anaerobic part of the second settling tank 4 and the aeration tank 3 are connected. 3a is connected by a return water pipe 55 to which a return pump 56 is attached.

The water quality component treatment mechanism 6 includes a blower 11, an electric valve 12 capable of adjusting the amount of air sent from the blower 11 to the water to be treated in the aeration tank 3, and a blower 11 to control the amount of air in the aeration tank 3. An air flow meter 13 for measuring the amount of air sent to the treated water. An aeration pipe 15 is installed in the aerobic part 3c in the aeration tank 3, and the aeration pipe 15 aerates the air sent from the blower 11 via the air pipe 14 into the water to be treated in the aerobic part 3c. .

The control device 5 is connected to the oxidation-reduction potentiometer 7, predicts the concentration of the water quality component in the water to be treated based on the measurement value of the oxidation-reduction potentiometer 7, and the blower 11 to the air diffuser 15
The air flow target value calculation unit 21 that calculates the amount of air to be sent to the air flow rate target unit 21 and the air flow target value calculation unit 21 are connected, and the motor operated valve 1
2 for adjusting the air volume.

First, nitrogen, phosphorus,
The treatment process for removing water quality components such as organic substances from the water to be treated will be outlined.

The water to be treated supplied to the first settling tank 2 via the supply water pipe 57 flows into the aeration tank 3 via the first water pipe 51. The water to be treated in the aeration tank 3 is subjected to anaerobic treatment in the anaerobic section 3a and aerobically treated in the aerobic section 3b and the aerobic section 3c. In particular, in the aerobic part 3c, the water to be treated is aerated by the air sent from the blower 11 through the air pipe 14 and the diffuser pipe 15.

The amount of air aerated to the water to be treated is calculated based on the value measured by the oxidation-reduction potentiometer 7 and the target air amount calculation unit 2
1 calculates the amount of air required for aeration of the water to be treated, and the air volume control unit 22 adjusts the motor-operated valve 12 based on the calculation place of the air flow target value calculation unit 21 and the measurement value of the air flow meter 13. Is adjusted by. Also, the aerobic part 3c of the aeration tank 3
A part of the untreated water is returned to the oxygen-free portion 3b by the circulation pump 54 through the circulation water pipe 53. As a result, the water to be treated is sufficiently aerated.

The water to be treated which has been aerated in the aeration tank 3 is the second
It flows into the second settling tank 4 via the water pipe 52. A part of the water to be treated which has flowed into the second settling tank 4 is returned by the return pump 56 to the upstream part of the aeration tank 3 via the return water pipe 55.
As a result, the water quality component in the water to be treated is sufficiently removed.

After that, the water to be treated in the second settling tank 4 is sent to a treatment facility at a subsequent stage through a discharge water pipe 58 or supplied as general domestic water.

With such a water quality control device, organic matter having a constant COD or BOD in the water to be treated is aerobically treated, and ammoniacal nitrogen (NH4-N) is subjected to nitrification reaction (NH4-N → NO2-N →). NO3-N) and denitrification reaction (NO3-N → N2) to nitrogen (N2), and further, phosphorus component contained in phosphoric acid phosphorus (PO4-P) which is the main component of phosphorus in the water to be treated. Is removed by the action of the phosphorus accumulating bacteria in the anaerobic part 3a and the action of the phosphorus accumulating bacteria in the aerobic part 3c.

Next, the control of the water quality component processing mechanism 6 by the controller 5 will be outlined.

The redox potential meter 7 measures the degree of oxidation or reduction of the water to be treated. This makes it possible to estimate the degree of promotion of an oxidation reaction such as a nitrification reaction or an excessive intake reaction of phosphorus, or a reduction reaction such as a denitrification reaction or a phosphorus release reaction.

In the air volume target value calculation unit 21, the measurement value deviation of the oxidation-reduction potentiometer 7 is calculated according to the following equations (1) to (3), and PI calculation processing is performed on this measurement value deviation to obtain the air volume. The control target value is calculated. The air volume control target value thus calculated is sent from the air volume target value calculation unit 21 to the air volume control unit 22.

<Air flow control target value calculation unit> (1) ORP deviation calculation [d-ORP] t = ([SV-ORP] t- [PV-ORP] t) (2) Aeration air amount target value calculation [d-Qg] t = Kp × ([d-ORP] t- [d-ORP] t-1) + h / Ti × [d-ORP] t ・ ・ ・ (2 ) Formula (3) Aeration air volume correction calculation [SV-Qg] t = [SV-Qg] t-1 + [d-Qg] t ・ ・ ・ (3) Formula <symbol> [SV-Qg] t: This time Aeration air volume target value [SV-Qg] t-1: Previous aeration air volume target value [d-Qg] t: Current aeration air volume target value correction value [PV-ORP] t: Current ORP measurement value [SV-ORP ] t: Target value of current ORP measurement value [d-ORP] t: Deviation of current ORP measurement value [d-ORP] t-1: Deviation of previous ORP measurement value Kp: Proportional gain Ti: Integration time h : Control cycle t: Time The air volume control unit 22 stores a circuit that adjusts the opening degree of the motor-operated valve 12 that determines the aeration air volume value measured by the air flow meter 13 by an inverter. ,
This circuit controls the opening of the motor-operated valve 12 to adjust the amount of air aerated to the water to be treated.

In this way, the air flow target value calculation unit 21 and the air flow control unit 22 adjust the electric valve 12 to adjust the amount of air sent to the aeration tank 3 based on the measurement value of the oxidation-reduction potentiometer 7. The nitrification reaction of the water quality component and the excessive intake reaction of phosphorus in the aeration tank 3 are controlled, and the removal treatment of the water quality component such as nitrogen and phosphorus is performed.

[0021]

The water quality components such as nitrogen, phosphorus and organic matter in the water to be treated are removed from the water to be treated by the above water quality control device 1.

However, in the case of removing the water quality component in the water to be treated from the water to be treated by the above-mentioned conventional water quality control device 1, the following can be considered.

That is, when the water quality of the water to be treated flowing into the water quality control device 1 suddenly changes, the conventional water quality control device 1 can sufficiently remove the water quality component in the water to be treated from the water to be treated. It is possible that it may not be possible.

The water quality component removal treatment of the water to be treated in the aeration tank 3 is performed via the control device 5 and the water quality component treatment mechanism 6 based on only the measured value of the redox electrometer 7 provided in the aeration tank 3. In this case, when the concentration of each water quality component in the treated water changes rapidly, the water quality control device 1 cannot follow this rapid change in the concentration of water quality component. Therefore, when the water quality component concentration in the water to be treated suddenly changes, the water quality control device 1 performs nitrification treatment, denitrification treatment for removing water components such as nitrogen, phosphorus, and organic substances in the water to be treated,
It is conceivable that the dephosphorization treatment cannot be carried out efficiently and that the water component removal treatment of the water to be treated becomes insufficient.

FIG. 8 shows the values measured by the redox potentiometer 7,
NH4 concentration in the inflow water flowing into the aeration tank 3 and NH in the treated water that has been subjected to the water quality component removal processing in the aeration tank 3
It is a figure which shows the relationship between 4 density | concentration and time.

As shown in FIG. 8, when the NH4 concentration in the inflow water suddenly increases, the NH4 concentration in the treated water deteriorates even if the measurement value of the redox electrometer 7 is stable. On the other hand, when the NH4 concentration in the inflow water suddenly decreases, the NH4 concentration in the water to be treated becomes good, but the amount of air sent to the aeration tank 3 becomes excessive, resulting in an over-aeration state. As a result, for example, in the sewage treatment plant, the operating cost increases because the aeration cost for closing about half of the electric power cost increases. Further, it is considered that the activated sludge flocs formed in the water to be treated are disassembled.

Further, a water quality sensor such as an SS meter or a UV meter is installed in the first settling tank 2 of the water quality control device 1 shown in FIG. A method of responding to a rapid increase in the concentration of the water quality component in the water to be treated may be considered by quickly and accurately obtaining it. However, in this case, the water quality sensor such as the SS meter and the UV meter is easily polluted by the water to be treated in the first settling basin 2, and if the water quality control device 1 is operated for several days, the measurement accuracy of the water quality sensor deteriorates. It may be impossible to use it. Therefore, with such a method, the frequency of maintenance of the water quality control device 1 becomes very high, and it is difficult to use such a water quality control device 1 in an actual sewage treatment plant or the like.

The present invention has been made in view of the above points, and it is possible to perform an appropriate water quality component removal treatment with high efficiency and at low cost even when the water quality component concentration in the water to be treated changes abruptly. An object of the present invention is to provide a water quality control device capable of achieving the above.

[0029]

The present invention is directed to an aeration tank having a water quality component treatment mechanism for removing a specific water quality component in the water to be treated, and an aeration tank installed in front of the aeration tank. An inflow that is connected to a redox electrometer that measures the degree of oxidation or reduction and a redox electrometer that predicts the concentration of the water quality component in the treated water based on the relational expression between the measurement value of the redox potential meter and the water quality component. A water quality control device comprising: a water quality prediction calculation unit; and a control unit that is connected to the inflow water quality prediction calculation unit and controls the water quality component processing mechanism based on the water quality component concentration predicted by the inflow water quality prediction calculation unit.

According to the present invention, since the concentration of the water quality component in the water to be treated is predicted based on the measurement value of the oxidation-reduction potentiometer installed before the aeration tank, before the water to be treated flows into the aeration tank. Moreover, it is possible to predict the concentration of water quality components in the water to be treated. As a result, in the aeration tank, it is possible to appropriately perform the water quality component removal process according to the concentration of the water quality component in the water to be treated.

Preferably, a plurality of oxidation-reduction potentiometers are arranged in the flow direction of the water to be treated, and the inflow water quality prediction calculation unit is
It stores each measurement value measured by each oxidation-reduction potentiometer and the relational expression between the difference between each measurement value and the water quality component.

Preferably, a plurality of oxidation-reduction potentiometers are arranged in a direction that is vertical to the flow direction of the water to be treated, and the inflow water quality prediction calculation unit is measured by each oxidation-reduction potentiometer. The relational expression between each measured value and the difference between each measured value and the water quality component is stored.

Preferably, a filter device is provided on the inlet side of the redox potentiometer.

More preferably, the filtration device has a membrane filtration mechanism.

More preferably, the filtering device has a sand filtering mechanism.

Preferably, a sludge treatment tank for treating sludge,
A sludge treatment tank and an aeration tank are connected, and a return water pipe for returning the water to be treated from the sludge treatment tank to the previous stage of the aeration tank,
The redox potentiometer measures the degree of oxidation or reduction of the water to be treated flowing through the return water pipe.

Preferably, the inflow water quality prediction calculation unit predicts a change in the water quality component concentration in the water to be treated based on the change value of the measured value of the oxidation-reduction potentiometer, and the control unit is the inflow water quality prediction calculation unit. The water quality component treatment mechanism is controlled based on the predicted water quality component concentration and the change in the water quality component concentration.

Preferably, the inflow water quality predicting / calculating section is connected to the inflow flow rate measuring means for measuring the flow rate of the water to be treated flowing into the aeration tank, and is connected to the inflow flow rate measuring means on the basis of the measured value of the inflow flow rate measuring means. And a correction calculation unit that corrects the concentration of the water quality component sent and sends the corrected water quality component concentration to the control unit.

Preferably, the inflowing water solids concentration measuring means for measuring the concentration of solids contained in the treated water flowing into the aeration tank, and the inflowing water solids concentration measuring means are connected to the inflowing water solids concentration measuring means. And a correction calculation unit that corrects the water quality component concentration sent from the inflow water quality prediction calculation unit and sends it to the control unit.

Preferably, it is connected to the inflow water UV value measuring means for measuring the ultraviolet absorption of the water to be treated flowing into the aeration tank and the inflow water UV value measuring means, and based on the measurement value of the inflow water UV value measuring means. And a correction calculation unit that corrects the concentration of the water quality component sent from the inflow water quality prediction calculation unit to the control unit.

Preferably, the inflow water temperature measuring means for measuring the water temperature of the treated water flowing into the aeration tank and the inflow water temperature measuring means are connected, and the inflow water quality is predicted based on the measured value of the inflow water temperature measuring means. And a correction calculation unit that corrects the concentration of the water quality component sent from the calculation unit to the control unit.

Preferably, the inflow water pH measuring means for measuring the pH of the water to be treated flowing into the aeration tank and the inflow water pH measuring means are connected, and the inflow water quality is predicted based on the measured value of the inflow water pH measuring means. And a correction calculation unit that corrects the concentration of the water quality component sent from the calculation unit to the control unit.

Preferably, the water quality component in the treated water to be removed in the aeration tank is any one of ammonia nitrogen, total nitrogen, Kjeldahl nitrogen, phosphoric acid phosphorus, total phosphorus, fermentation products, and easily decomposable organic substances. One or a combination of these.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention. Here, FIG. 1 is a configuration diagram showing a water quality control device 1 for removing water quality components in the water to be treated.

As shown in FIG. 1, the water quality control device 1 is provided with an aeration tank 3 having a water quality component treatment mechanism 6 for removing specific water quality components such as nitrogen, phosphorus and organic substances in the water to be treated such as sewage. There is.

The first settling tank 2 is connected to the upstream side of the aeration tank 3 via a first water pipe 51, and the second settling tank 2 is connected to the downstream side of the aeration tank 3 via a second water pipe 52. The sedimentation tank 4 is connected. A supply water pipe 57 is connected to the upstream side of the first settling basin 2, and a discharge water pipe 58 is connected to the downstream side of the second settling basin 4.

The first settling tank 2 and the second settling tank 4 are each connected to the sludge treatment tank 10 via a sludge water pipe 64. Sludge water containing sludge in the first settling tank 2 and the second settling tank 4 is sent to the sludge treatment tank 10 through a sludge water pipe 64 and is subjected to sludge treatment. Further, the sludge treatment tank 10 and the supply water pipe 57 are connected by a return water pipe 65,
The sludge treatment return water that has been sludge-treated in the sludge treatment tank 10 is returned from the sludge treatment tank 10 through the return water pipe 65 to the supply water pipe 57 installed upstream from the aeration tank 3.

A controller 5 is connected to the water quality component treatment mechanism 6, and the degree of oxidation and reduction of the water to be treated in the first settling tank 2 is measured at the rear stage of the first settling tank 2. An oxidation-reduction potentiometer 7 (ORP meter) is provided. Therefore, the oxidation-reduction potentiometer 7 is installed in the preceding stage of the aeration tank 3 and measures the degree of oxidation or reduction of the water to be treated which flows into the aeration tank 3.

The aeration tank 3 has an anaerobic section 3a for performing anaerobic treatment of the water to be treated, an anaerobic section 3b for performing aerobic treatment of the water to be treated, and an aerobic section 3c arranged in order from the upstream to the downstream. Is configured.

Aerobic part 3c and anoxic part 3b of the aeration tank 3
Is a circulating water pipe 53 to which a circulating pump 54 is attached.
Connected by the second settling tank 4 and aeration tank 3
The anaerobic part 3a is connected by a return water pipe 55 to which a return pump 56 is attached.

The water quality component treatment mechanism 6 has a blower 11, an air diffusing pipe 15 installed in the aerobic section 3c of the aeration tank 3, and an air pipe 14 connecting the blower 11 and the air diffusing pipe 15. Therefore, the air diffuser 15 is connected to the air pipe 14 from the blower 11.
The air sent via the air is aerated into the water to be treated in the aerobic part 3c of the aeration tank 3. In the air tube 14,
A motor-operated valve 12 capable of adjusting the amount of air sent from the blower 11 to the air diffuser 15, and an air diffuser 15 from the blower 11
And an air flow meter 13 for measuring the amount of air sent to.

The control unit 5 has an inflow water quality prediction calculation unit 23.
And an air volume target value calculation unit 21 and an air volume control unit 22. The inflow water quality prediction calculation unit 23 is electrically connected to the oxidation-reduction potentiometer 7, and based on the relational expression between the measurement value of the oxidation-reduction potentiometer 7 and NH4 (water quality component), which will be described later, NH4 ( Water quality component) Concentration is calculated and predicted. The air volume target value calculation unit 21 is electrically connected to the inflow water quality prediction calculation unit 23, and calculates the amount of air sent from the blower 11 to the aeration tank 3 based on the calculation value in the inflow water quality prediction calculation unit 23.
The air volume control unit 22 is electrically connected to the air volume target value calculation unit 21, and also electrically connected to the air flow meter 13 and the motor-operated valve 12. This air volume control unit 22 calculates the air flow rate target value calculation unit 21 and the air flow meter 1
The motor-operated valve 12 is adjusted based on the measurement value in 3 to adjust the amount of air sent from the blower 11 to the aeration tank 3 to control the air amount. The air volume target value calculation unit 21 and the air volume control unit 22 constitute a control unit.

The inflow water quality predicting / calculating section 23 stores the following equation (4) for calculating and predicting the NH4 concentration in the water to be treated flowing into the aeration tank 3. The air volume target value calculation unit 21 also stores equation (5) for calculating and predicting the aeration air volume target value and equation (6) for calculating the aeration air volume target value correction value.

<Inflow Water Quality Prediction Calculation Section> (1) NH4 Concentration Prediction Calculation [NH4in] t = a1 × [PV-ORP] t + b1 ... (4) Equation <Air Volume Control Target Value Calculation Section ＞ (2) Aeration air flow rate target value calculation [d-Qg] t = Kp × ([NH4in] t- [NH4in] t-1) ... (5) Equation (3) Aeration air flow rate correction calculation [ SV-Qg] t = [SV-Qg] t-1 + [d-Qg] t ···· (6) Formula <Symbol> [PV-ORP] t: ORP measurement value of this time [NH4in] t: NH4 predicted value [SV-Qg] t of this time: Target value of aeration air volume [SV-Qg] t-1: Target value of aeration air volume of previous time [d-Qg] t: Target value of aeration air volume correction value of this time a1, b1: Prediction calculation coefficient Kp: Proportional gain t: Time Next, the operation of the present embodiment having such a configuration will be described.

First, the water quality component removal processing by the water quality control device 1 will be outlined.

The water to be treated, which is newly supplied to the water quality control device 1 and requires the removal treatment of the water quality component such as NH 4, flows into the first settling tank 2 through the supply water pipe 57.

The water to be treated which has flowed into the first settling tank 2 is subjected to floc and sludge settling treatment. In addition, the first settling tank 2
The degree of oxidation or reduction of the water to be treated therein is measured by the oxidation-reduction potentiometer 7. The value measured by the oxidation-reduction potentiometer 7 is sent from the oxidation-reduction potentiometer 7 to the inflow water quality prediction calculation unit 23 of the control device 5.

The water to be treated flows into the aeration tank 3 from the first settling tank 2 through the first water pipe 51. The water to be treated that has flowed into the aeration tank 3 is sequentially passed through the anaerobic part 3a, the anoxic part 3b, and the aerobic part 3c of the aeration tank 3, and the water quality component removal process is performed in each part.

In particular, in the aerobic section 3c, the water to be treated is aerated and the aerobic treatment is promoted under the control of the water quality component treatment mechanism 6 by the controller 5 described later.

In such an aeration tank, the organic matter having a constant COD or BOD in the water to be treated is aerobically treated and removed by the heterotrophic bacteria in the anoxic part 3b and the aerobic part 3c.

Further, ammoniacal nitrogen (N
H4-N) is a nitrification reaction (NH4) of nitrifying bacteria in the aerobic part 3c.
Oxidized into nitrate nitrogen (NO3-N) by -N → NO2-N → NO3-N). A part of this nitrifying solution containing a large amount of nitrate nitrogen is sent from the aerobic part 3c to the anoxic part 3b through the circulating water pipe 53 by the circulation pump 54, and the denitrification reaction of heterotrophic bacteria (denitrifying bacteria) is carried out. (NO3-N
→ It is reduced to N2 by N2).

The phosphoric acid phosphorus (PO4-P), which is the main component of phosphorus in the water to be treated, is released by the action of the phosphorus accumulating bacteria in the anaerobic part 3a.
It is ingested and removed by the phosphorus accumulating bacteria in the aerobic part 3c.

The water to be treated is aerated in the aeration tank 3 as described above.
After the water quality component removing process in (1) is performed, it flows into the second settling tank 4 from the aeration tank 3 through the second water pipe 52.

In the second settling basin, flocs and sludge in the water to be treated are removed. A part of the water to be treated that has flowed into the second settling tank 4 is returned by the return pump 56 to the aerobic section 3c of the aeration tank 3 via the return water pipe 55. As a result, the water quality component removing process of the water to be treated supplied to the water quality control device 1 is sufficiently performed.

After that, the water to be treated in the second settling tank 4 is sent to the treatment facility in the subsequent stage through the discharge water pipe 58 or supplied as general domestic water.

The treated water containing flocs and sludge removed in the first settling tank 2 and the second settling tank 4 is sludge treated from the first settling tank 2 and the second settling tank 4 through the sludge water pipe 64. It is sent to the tank 10 and treated with sludge. Also,
The sludge treatment return water that has been sludge-treated in the sludge treatment tank 10 is sent to the supply water pipe 57 via the return water pipe 65, and is supplied to the first settling tank 2 together with the treated water newly supplied to the water quality control device 1. It will flow in.

Next, the control of the water quality component processing mechanism 6 by the controller 5 will be described in detail.

The oxidation-reduction potentiometer 7 shows a positive value on the oxidation side (0 to 300 mV) when the oxidation reaction such as the nitrification reaction or the phosphorus excessive intake reaction is promoted. When a reducing reaction such as a denitrification reaction or a phosphorus release reaction is promoted, a negative value on the reducing side (-500 mV to 0 mV) is shown. Therefore, when the measurement value of the oxidation-reduction potentiometer 7 is low and is on the reduction side, the blower 11 in the control device 5 is
When the air flow rate control target value for controlling the amount of air sent from the air to the aeration tank 3 is increased and set, and when the measurement value of the electrometer is high and is on the oxidation side, the air volume control in the control device 5 is performed. It is necessary to raise and set the target value.

The degree of oxidation or reduction of the water to be treated in the latter part of the first settling tank 2 is measured by such an oxidation-reduction potentiometer 7. Then, the measurement value of the redox electrometer 7 is
It is sent to the inflow water quality prediction calculation unit 23 of the control device 5.

The inflow water quality predicting / calculating section 23 calculates and predicts the NH4 concentration in the water to be treated based on the measurement value of the oxidation-reduction potentiometer 7 according to the above equation (4), and the calculated and predicted NH4
The concentration is sent to the air volume target value calculation unit 21.

The target air flow rate calculation unit 21 calculates the NH4 concentration from the inflow water quality prediction calculation unit 23 and the above equations (5) and (6) based on the equations (5) and (6). The target value of the aeration air amount of the air used for aeration in the aerobic unit 3c of the aeration tank 3 is calculated, and the aeration air amount target value correction value for correcting the aeration air amount target value is calculated.

The aeration air amount target value and the aeration air amount target value correction value calculated by the air amount target value calculation unit 21 are sent to the air amount control unit 22. The air flow rate of the air flowing through the air pipe 14 is measured by the air flow meter 13, and the measured value is sent from the air flow meter 13 to the air volume control unit 22.

The air volume control unit 22 includes an air volume target value calculation unit 21.
Aeration air volume target value and aeration air volume target value correction value from
The electric valve 12 is adjusted based on the measured air amount from the air flow meter 13 to adjust the amount of air sent from the blower 11 to the diffuser pipe 15 via the air pipe 14 to control the air flow. Thereby, the aerobic part 3c of the aeration tank 3 can perform aerobic treatment according to the water quality component concentration in the water to be treated.

As described above, according to the present embodiment, the oxidation-reduction potentiometer 7 is installed before the aeration tank 3, so that the water in the water to be treated before the water to be treated flows into the aeration tank 3. The water quality component concentration can be calculated and predicted. For this reason,
The amount of air sent from the blower 11 to the aerobic part 3c of the aeration tank 3 via the air pipe 14 and the air diffuser 15 is controlled with a time margin. Therefore, the water quality control device 1 can perform efficient aerobic treatment according to the concentration of the water quality component in the water to be treated. As a result, even when the concentration of the water quality component in the water to be treated suddenly changes, the appropriate water quality component removal treatment can be performed with high efficiency and at low cost.

The amount of air sent from the blower 11 to the aerobic part 3c of the aeration tank 3 via the air pipe 14 and the air diffuser pipe 15 is controlled according to the concentration of water quality components such as NH4 in the water to be treated. Since this is ensured, it is possible to reduce the aeration cost, which accounts for a large proportion of the operating cost.

Since only one redox electrometer 7 is installed, the degree of oxidation or reduction of the water to be treated necessary for controlling the amount of air sent from the blower 11 to the aerobic part 3c of the aeration tank 3 is controlled. The measured value is a single measured value. Therefore, the control configuration is simpler than the case where the air volume is controlled by adjusting the air volume based on a plurality of measured values, and the control operation can be made efficient.

In addition, the inflow water quality predicting / calculating unit 23 uses NH4
Since the concentration is calculated and predicted, the water quality control device 1 can control the nitrification reaction accompanying the NH4 removal processing. In addition, since the simple linear form represented by the equation (4) is used as the arithmetic expression for the arithmetic prediction of the NH4 concentration in the inflow water quality prediction arithmetic unit 23, the parameter adjustment of this arithmetic expression becomes easy. The calculation formula used in the calculation calculation of the NH4 concentration in the inflow water quality prediction calculation unit 23 is expressed in a linear format (4).
The index is not limited to the formula, and other indices ((4
Various functions such as a (see a)), logarithm (see (4b) below), exponentiation (see (4c) below), integration (see (4d) below), and the like can be used. Also, a non-linear model formula such as a neural network can be used.

<Inflow Water Quality Prediction Calculation Unit> (1) NH4 concentration prediction calculation [NH4in] t = a7 × [PV-ORP] t ^C7 + b7 ... (4a) Equation [NH4in] t = a8 × ln [PV-ORP] t + b8 ・ ・ ・ ・ ・ ・ (4b) formula [NH4in] t = a9 × exp [PV-ORP] t + b9 ・ ・ ・ ・ ・ ・ ・ (4c) formula [NH4in ] t = a10 × ∫ [PV-ORP] t + b10 ···· (4d) Equation <Symbol> [PV-ORP] t: ORP measurement value of this time [NH4in] t: NH4 predicted value of this time a7, a8, a9, a10, b7, b8, b9, b10: Expected calculation coefficient The location of the redox electrometer 7 is not limited to the latter part of the first settling tank 2 and the aeration tank 3 It can be arranged at any position as long as it is in the preceding stage. For example, in any place of the first settling basin 2, in the first water pipe 51 located between the first settling basin 2 and the aeration tank 3, or in a pump well (not shown) located before the first settling basin 2, Sand pond,
The oxidation-reduction potentiometer 7 can be arranged in an inflow conduit or the like.

The water quality component in the water to be treated, which is calculated and predicted by the inflow water quality prediction calculation unit 23 and which is removed in the aeration tank 3, is not limited to NH4. Other water quality components in the water to be treated include, for example, total nitrogen (TN), Kjeldahl nitrogen (TKN), phosphoric acid phosphorus (PO4-P), total phosphorus (TP), low molecular weight compounds represented by acetic acid. Any one or a combination of a fermentation product (SA) containing an organic acid and a readily degradable organic matter (SF) is considered. The inflow water quality prediction calculation unit 23 can also calculate and predict the concentration of each water quality component based on the measurement value of the redox electrometer 7 for these water quality components in the water to be treated. In this case, it is necessary to use an appropriate calculation formula according to each water quality component to be calculated and predicted.

Further, the water quality component treatment mechanism 6 for removing the water quality component in the water to be treated in the present embodiment is the aeration tank 3
Although the amount of aeration air to be treated water is controlled by adjusting the air sent to, the present invention is not limited to this, and other water quality component treatment mechanism 6 can be controlled. Other control methods of the water quality component processing mechanism 6 include, for example, the following. That is, the aeration ratio control for controlling the aeration ratio by dividing the aeration air amount by the inflow amount to be constant, the DO constant control for calculating the aeration air target value so that the dissolved oxygen concentration DO is constant, and the return flow rate for constant return Amount control, return rate control to control the return ratio to a constant, excess sludge removal timer control to control the excess sludge removal amount by the removal time of the timer, control excess sludge removal amount to keep the solid retention time SRT constant SRT constant control, aeration tank 3 sludge concentration MLSS constant control that controls the return amount or excess sludge withdrawal amount so that the MLSS becomes constant, coagulant inflow control that controls the injection amount of coagulant such as PAC and iron sulfate, It can also be applied to a coagulant injection rate control for controlling the injection ratio of a coagulant such as PAC or iron sulfate.

Second Embodiment FIG. 2 is a diagram showing a second embodiment of the present invention. Here, FIG. 2 is a configuration diagram showing a water quality control device 1 for removing water quality components in the water to be treated.

In the second embodiment shown in FIG. 2, the water quality control device 1 has two (a plurality of) redox electrometers 7, and each redox electrometer 7 is connected to the first settling tank 2. , Is installed in the flow direction of the water to be treated. Further, the inflow water quality prediction calculation unit 23 is a relational expression between each measurement value measured by each oxidation-reduction potentiometer 7 and the difference between each measurement value and the water quality component,
The following expression (7) is stored.

<Inflow Water Quality Prediction Calculation Unit> (1) NH4 Concentration Prediction Calculation [NH4in] t = a2 × {[PV-ORP2] t- [PV-ORP1] t} + b2 ··· (7 ) <Symbol> [PV-ORP1] t: First ORP measurement value [PV-ORP2] t: Second ORP measurement value [NH4in] t: NH4 predicted value a2, b2: Prediction calculation coefficient 7) is the difference between the measured values of the redox electrometers 7, the change value of the NH4 concentration in the flow direction of the treated water in the first settling tank 2, and the treated water flowing into the aeration tank 3. This is an equation that takes into account the correlation between the concentration of water quality components.

The other structure is substantially the same as that of the first embodiment shown in FIG.

In FIG. 2, the same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

The degree of oxidation or reduction of the water to be treated, which has flowed into the first settling tank 2 through the supply and drainage pipes, is measured by each oxidation-reduction potentiometer 7. Each measured value by each redox potential meter 7 is sent from each redox potential meter 7 to the inflow water quality prediction calculation unit 23.

The inflow water quality predicting / calculating section 23 calculates the NH4 in the water to be treated based on the respective measured values from the respective redox electrometers 7.
(Water quality component) Concentration is calculated and predicted. That is, the inflow water quality prediction calculation unit 23 obtains the NH4 concentration based on the difference between the measurement values of the respective redox electrometers 7 and the above equation (7).

NH calculated by the inflow water quality prediction calculation unit 23
The calculated values of the four concentrations are sent from the inflow water quality prediction calculation unit 23 to the air volume target value calculation unit 21, and the air volume target value and the air volume target value correction value are calculated. Then, the air volume control unit 22 receives the air volume target value and the air volume target value correction value, and the air flow meter 1
Adjust the motor-operated valve 12 based on the measured value of 3 and blower 1
The amount of air sent from 1 to the aeration tank 3 is adjusted to control the amount of air.

In this case, the inflow water quality prediction calculation unit 23
The difference value of the measurement values of the respective redox electrometers 7 used in the calculation in 1. is subtracted from the measurement value of the redox electrometer 7 of the raw sludge at the bottom of the first sedimentation tank 2.

Next, a modification of the present embodiment will be described.

As shown in FIG. 2, an oxidation-reduction potentiometer 7 is provided in the return water pipe 65 connecting the sludge treatment tank 10 and the supply water pipe 57, and the oxidation-reduction potentiometer 7 is introduced into the controller 5. It may be electrically connected to the water quality prediction calculation unit 23.

The sludge treated return water which has been sludge treated in the sludge treatment tank 10 is sent to the supply water pipe 57 through the return water pipe 65. At this time, the degree of oxidation or reduction of the sludge treatment return water flowing through the return water pipe 65 is measured by an oxidation-reduction potentiometer 7 provided in the return water pipe 65, and the measured value is measured from the oxidation-reduction potentiometer 7 to a controller. 5 is sent to the inflow water quality prediction calculation unit 23. In the inflow water quality prediction calculation unit 23, similarly to the water quality control device 1 of the second embodiment described above, the calculation prediction of the NH4 concentration is performed based on the measurement value of each oxidation-reduction potentiometer 7, and the air flow target value calculation is performed. The unit 21 obtains the target air amount value and the target air amount correction value. And the air volume control unit 2
2 is based on the air flow rate target value, the air flow rate target value correction value, and the measurement value of the air flow meter 13 from the blower 11 to the aeration tank 3
The air volume is controlled by adjusting the amount of air sent to.

Next, another modification of the present embodiment will be described.

As shown in FIG. 3, two redox electrometers 7 may be arranged in the first settling tank 2 in the direction perpendicular to the flow direction of the water to be treated. . In this modified example as well, similar to the water quality control device 1 of the second embodiment described above, the inflow water quality prediction calculation unit 23 performs the calculation prediction of the NH4 concentration based on the measurement value of each oxidation-reduction potentiometer 7. That is, the air volume target value calculation unit 21 obtains the air volume target value and the air volume target value correction value. And the air volume control unit 2
2 is based on the air flow rate target value, the air flow rate target value correction value, and the measurement value of the air flow meter 13 from the blower 11 to the aeration tank 3
The air volume is controlled by adjusting the amount of air sent to.

In this case, the inflow water quality prediction calculation unit 2
The difference value of the measured values of the respective redox electrometers 7 used in the calculation in 3 is obtained by subtracting and correcting the measured value of the redox electrometer 7 of the raw sludge content at the bottom of the first sedimentation tank 2.

As described above, according to the present embodiment, the motor-operated valve 12 is adjusted based on each measurement value from the plurality of redox electrometers 7 and the air is sent from the blower 11 to the aeration tank 3. By adjusting the air volume and controlling the air volume, 1
Compared to the case based on the measurement value of each redox electrometer 7,
It is possible to perform the water quality component removal treatment according to the property of the water to be treated more sensitively and accurately.

Third Embodiment FIG. 4 is a diagram showing a third embodiment of the present invention. Here, FIG. 4 is a configuration diagram showing a water quality control device 1 for removing water quality components in the water to be treated.

In the third embodiment shown in FIG. 4, the water quality control device 1 is provided with a filtering device 8 on the inlet side of the oxidation-reduction potentiometer 7.

The filtration device 8 is composed of an ultrafiltration membrane 31 connected to a rear part of the first settling tank 2 via a first filtered water pipe 59.
And a filtered water tank 32 connected to the ultrafiltration membrane 31 via a second filtered water pipe 60. The ultrafiltration membrane 31 and the first stage of the first sedimentation tank 2 are connected by a first filtration return pipe 61 to which a filtration pump 63 is attached. Also,
The filtered water tank 32 and the first stage of the first settling tank 2 are connected by a second filtration return pipe 62, and when the water to be treated in the filtered water tank 32 becomes higher than the mounting position of the second filtration return pipe 62, it is filtered. The water to be treated in the water tank 32 is returned by gravity flow to the first settling tank 2 through the second filtration return pipe 62. In this way, the filtering device 8 includes the first filtered water pipe 5
9, ultrafiltration membrane 31, second filtered water pipe 60, filtered water tank 3
2. A membrane filtration mechanism formed by the filtration pump 63, the first filtration return pipe 61, and the second filtration return pipe 62.

Further, in the filtered water tank 32, an oxidation-reduction potentiometer 7
Is provided, and the oxidation-reduction potentiometer 7 includes a filtered water tank 32.
The degree of oxidation or reduction of the water to be treated can be measured.

Further, the inflow water quality prediction calculation section 23 stores the following equation (8) for calculating and predicting the NH4 concentration in the water to be treated flowing into the aeration tank 3.

<Inflow Water Quality Prediction Calculation Unit> (1) NH4 Concentration Prediction Calculation [NH4in] t = a3 × {[PV-d-ORP] t} + b3 (8) Equation <Symbol> [PV-d-ORP] t: Soluble ORP measurement value [NH4in] t: NH4 predicted value a3, b3: Prediction calculation coefficient Other configurations are substantially the same as those of the first embodiment shown in FIG.

In FIG. 4, the same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

The water to be treated in the latter part of the first settling basin 2 is driven by the filtration pump 63 to flow into the ultrafiltration membrane 31 through the first filtered water pipe 59 to be membrane-filtered, and then to be treated. Water is returned from the ultrafiltration membrane 31 to the first stage of the first settling tank 2 via the first filtration return pipe 61. In this way, the water to be treated circulates between the first settling tank 2 and the filtration device 8.

In the process of circulating the water to be treated as described above, a part of the water to be treated which has been membrane-filtered by the ultrafiltration membrane 31 is
Due to the floss flow force on the surface of the ultrafiltration membrane 31, it flows into the filtered water tank 32 through the second filtered water pipe 60.

The degree of oxidation or reduction of the water to be treated flowing into the filtered water tank 32 is measured by the oxidation-reduction potentiometer 7. Therefore, the water to be treated measured by the oxidation-reduction potentiometer 7 is filtered water that has been subjected to membrane filtration to completely remove the solid matter (SS) component.

The measurement value thus measured by the oxidation-reduction potentiometer 7 is sent to the inflow water quality prediction calculation unit 23. The inflow water quality prediction calculation unit 23 calculates and predicts the NH4 concentration in the water to be treated based on the measurement value of the oxidation-reduction potentiometer 7 according to the above equation (8).

Further, the air volume target value calculation unit 21 corrects the target value of the aeration air volume and the aeration air volume target value from the NH4 concentration sent from the inflow water quality prediction calculation unit 23 and the equations (5) and (6). The value is calculated. Then, the air volume control unit 22
Adjusts the motor-operated valve 12 based on the aeration air amount target value and the aeration air amount target value correction value from the air amount target value calculation unit 21 and the air amount measurement value from the air flow meter 13, and the blower 11
The air volume is controlled by adjusting the amount of air sent from the air diffuser 15 to the air diffuser 15 via the air pipe 14.

The water to be treated which has flowed into the filtered water tank 32 is the second
When the position is higher than the mounting position of the filtration return pipe 62, it is returned to the first settling tank 2 through the second filtration return pipe 62 by the gravity flow.

Next, a modification of the present embodiment will be described.

In the water quality control device 1 according to the present invention, the sand filtration device 33 may be used instead of the ultrafiltration membrane 31. In this case, the filtration device 8 has a sand filtration mechanism instead of the membrane filtration mechanism by the sand filtration device 33 and the like. In this case, the water to be treated which has flowed into the sand filter device 33 through the first filtered water pipe 59 is sand-filtered to completely remove the solid matter (SS) component. As a result, the water to be treated measured by the oxidation-reduction potentiometer 7 is filtered water from which solid components have been removed.

If the sand filter 33 is used,
If the sand filter device 33 is disposed below to allow the water to be treated to flow down naturally, a power source such as the filtration pump 63 becomes unnecessary, and the structure can be simplified and the operating cost can be reduced.

As another modification of the present embodiment, the ultrafiltration membrane 31 may be replaced with another filtration membrane such as a microfiltration membrane (MF membrane) or a hollow fiber membrane. Also in this case, the water to be treated measured by the oxidation-reduction potentiometer 7 is filtered through another filtration membrane such as a microfiltration membrane or a hollow fiber membrane through the first filtered water pipe 59 to obtain a solid matter (SS). The filtered water from which the component was removed will be used.

As described above, according to the present embodiment, the water to be treated which is to be measured by the oxidation-reduction potentiometer 7 is filtered water obtained by filtering the solid component by the ultrafiltration membrane 31. Is used. Thereby, the inflow water quality prediction calculation unit 23 can accurately obtain the water quality component concentration in the water to be treated. In particular, when a soluble water quality component is a target of prediction in the inflow water quality prediction calculation unit 23, as in the calculation prediction of NH4 concentration, the solid component in the treated water has a great influence on the measurement of the redox electrometer 7. Therefore, by using the filtered water from which the solid component has been removed for the measurement of the oxidation-reduction potentiometer 7, the inflow water quality prediction calculation unit 23 can more accurately obtain the water quality component concentration in the water to be treated.

Fourth Embodiment In the water quality control device 1 according to the present embodiment, in the inflow water quality prediction calculation unit 23 of the control device 5 shown in FIG. 1, the measured value of the redox potential meter 7 and the redox potential meter are used. The following equation (9) is stored in order to calculate and predict the concentration of the water quality component in the water to be treated and the change in the concentration of the water quality component based on the change value of the measurement value of No. 7 and the change value.

<Inflow Water Quality Prediction Calculation Unit> (1) NH4 concentration prediction calculation [NH4in] t = a4 × {[PV-ORP] t- [PV-ORP] t-1} + b4 ... (9) Formula <Symbol> [PV-ORP] t: Current ORP measurement value [PV-ORP] t-1: Previous ORP measurement value [NH4in] t: Current NH4 predicted value a4, b4: Prediction calculation coefficient Further, the air volume target value calculation unit 21 of the control device 5 obtains the air volume target value and the air volume target value correction value based on the change in the water quality component concentration and the water quality component concentration from the inflow water quality prediction calculation unit 23.

The other structure is substantially the same as that of the first embodiment shown in FIG.

The same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

The degree of oxidation or reduction of the water to be treated which has flowed into the first settling tank 2 via the supply water pipe 57 is measured by the redox electrometer 7, and the measured value of the redox electrometer 7 is the control device. 5 is sent to the inflow water quality prediction calculation unit 23.
The inflow water quality prediction calculation unit 23 calculates the water quality component concentration in the water to be treated based on the measurement value of the oxidation-reduction potentiometer 7, the change value of the measurement value of the oxidation-reduction potentiometer 7, and the above equation (9). Calculate and predict changes in water quality component concentrations. FIG. 5 is a diagram showing the relationship between the measurement time and the measurement value of the redox electrometer, and the relationship between the measurement time and the differential value of the measurement value of the redox electrometer.

The water quality component concentration in the to-be-treated water and the change in the water quality component concentration, which are calculated and predicted by the inflow water quality prediction calculation unit 23, are sent to the air flow target value calculation unit 21, which then calculates the water quality component. The air volume target value and the air volume target value correction value are calculated based on the changes in the concentration and the water quality component concentration.

As described above, according to the present embodiment, in the air volume target value calculation unit 21 of the control device 5, the water quality component concentration and the water quality component concentration in the treated water calculated by the inflow water quality prediction calculation unit 23 are calculated. Based on the change of, the air volume target value and the air volume target value correction value are calculated. As shown in FIG.
When the value of the change in the concentration of the water quality component is negative, the inflow amount of NH4, which is an oxidizing substance, is decreased, and when the value is positive, the inflow amount of NH4 is increased. Therefore, when calculating the air flow target value and the air flow target value correction value in the air flow target value calculation unit 21, by considering not only the water quality component concentration in the treated water but also the change in the water quality component concentration,
Aeration tank 3 from blower 11 required for aeration of treated water
The amount of air sent to the air conditioner can be obtained with higher accuracy, and the control device 5 can perform more accurate air flow rate control.

Fifth Embodiment FIG. 6 is a diagram showing a fifth embodiment of the present invention. Here, FIG. 6 is a configuration diagram showing a water quality control device 1 for removing water quality components in the water to be treated.

In the fifth embodiment shown in FIG. 6, an inflow flow meter 9 (inflow flow rate measuring means) is attached to the first water pipe 51 connecting the first settling tank 2 and the aeration tank 3. . The inflow flow meter 9 flows through the first water pipe 51 and flows into the aeration tank 3
It is possible to measure the flow rate of the water to be treated that will flow into the.

The controller 5 further has an inflow water quality prediction correction calculation unit 24 (correction calculation unit). The inflow water quality prediction correction calculation unit 24 is electrically connected to the inflow water quality prediction calculation unit 23, is electrically connected to the air volume target value calculation unit 21, and is also electrically connected to the inflow flow meter 9. There is. The inflow water quality prediction correction calculation unit 24 calculates the water quality component concentration predicted value, which is the calculated value of the water quality component concentration in the water to be processed, sent from the inflow water quality prediction calculation unit 23, and the processed water sent from the inflow flowmeter 9. A water quality component concentration predicted correction value obtained by correcting the water quality component concentration in the water to be treated based on the water inflow amount is sent to the air volume target value calculation unit 21.

The inflow water quality prediction calculation unit 23 stores the following equation (10) for calculating and predicting the NH4 concentration in the water to be treated flowing into the aeration tank 3.

<Influent Water Quality Prediction Calculation Unit> (2) NH4 Concentration Prediction Correction Calculation [NH4in] t = a5 × [Qin] t × [NH4in] t + b5 ... (10) Equation <Symbol> [PV-ORP] t: Current ORP measurement value [PV-ORP] t-1: Previous ORP measurement value [NH4in] t: Current NH4 predicted value [Qin] t: Current inflow measurement value a1, b1 , a5, b5: Prediction calculation coefficient Other configurations are substantially the same as those of the first embodiment shown in FIG.

In FIG. 6, the same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

The water to be treated which has flowed into the first settling tank 2 via the supply water pipe 57 flows into the aeration tank 3 via the first water pipe 51. At this time, the flow rate of the water to be treated flowing into the aeration tank 3 is measured by the inflow flow meter 9 attached to the first water pipe 51, and the measured value of the inflow flow meter 9 is the control device 5.
Is sent to the inflow water quality prediction correction calculation unit 24.

The degree of oxidation or reduction of the water to be treated in the first settling basin 2 is measured by the oxidation-reduction potentiometer 7, and the inflow water quality prediction calculation unit is based on the measured value of the oxidation-reduction potentiometer 7. The calculated value of the water quality component concentration in the treated water calculated in 23 is sent from the inflow water quality prediction calculation unit 23 to the inflow water quality prediction correction calculation unit 24.

In the inflow water quality prediction correction calculation unit 24, the measured value of the flow rate of the water to be treated flowing into the aeration tank 3 sent from the inflow flow meter 9 and the treated water sent from the inflow water quality prediction calculation unit 23. Calculated value of water quality component concentration and (4) above
The water quality component (NH4) concentration in the water to be treated is corrected based on the equation and the equation (10).

Instead of correcting the concentration of the water quality component in the water to be treated by the inflow water quality prediction calculation unit 24, the inflow water quality prediction calculation unit 23 flows the aeration tank 3 sent from the inflow flowmeter 9 in advance. It is also possible to calculate the water quality component concentration using a mathematical formula that takes into consideration the measured value of the flow rate of the water to be treated. In this case, for example, the following equation (11) can be used.

[0133] <Inflow water quality prediction calculation unit including correction calculation> (1) NH4 concentration prediction calculation   [NH4in] t = a6 × [PV-ORP] t + c6 × [Qin] t + b6 ・ ・ ・ ・ ・ ・ (11)     <Symbol>     [PV-ORP] t: ORP measurement value this time     [PV-ORP] t-1: Previous ORP measurement value     [NH4in] t: NH4 predicted value this time     a6, b6, c6: Expected calculation coefficient Next, a modified example of the present embodiment will be described.

As an inflow measuring means for measuring the flow rate of the water to be treated flowing into the aeration tank 3, a pump well (not shown) is provided in front of the first settling basin 2 and flows the water to be treated inside the water quality control device 1. It is also possible to use the water level gauge provided in).

From the water level H of the pump well measured by the water level gauge, and the QH curve showing the relationship between this water level H and the flow rate Q of the water to be treated flowing into the aeration tank 3, the aeration tank 3 flowing into the aeration tank 3 is shown. The flow rate Q of treated water can be calculated.

The flow rate Q of the water to be treated flowing into the aeration tank 3 calculated in this way is calculated by the inflow water quality prediction correction calculation unit 24.
Is used to correct the water quality component (NH4) concentration in the water to be treated.

Next, another modification of this embodiment will be described.

It is also possible to attach an inflow SS meter (inflow water solids concentration measuring means) to the first water pipe 51 and electrically connect this SS meter to the inflow water quality prediction correction calculation section 24 of the controller 5. .

The solids concentration contained in the water to be treated flowing into the aeration tank 3 is measured by the SS meter, and the measured value of the SS meter is sent from the SS meter to the inflow water quality prediction correction calculation unit 24.

The inflow water quality predicting / calculating unit 24 uses an appropriate arithmetic expression to calculate the inflow water quality based on the solid concentration in the treated water to be treated flowing into the aeration tank 3 sent from the SS meter. The calculated value of the NH4 (water quality component) concentration of the water to be treated sent from the unit 23 is corrected.

When the concentration of the water quality component in the water to be treated is determined from the degree of oxidation or reduction of the water to be treated measured by the oxidation-reduction potentiometer 7, the solid matter concentration in the water to be treated has a great influence. Therefore, by correcting the water quality component concentration in the treated water using the solid matter concentration in the treated water measured by the SS meter, the concentration of the water quality component in the treated water can be accurately obtained.

Further, since the treated water flowing through the first water pipe in which the SS meter is installed undergoes flocculation and sludge sedimentation treatment in the first settling tank, the SS meter should be polluted by the treated water. Is decreasing.

When the inflow water quality prediction correction calculation unit 24 corrects the water quality component concentration, the following measurement values of the measuring instruments can be used.

That is, an inflow turbidity meter (inflow water solids concentration measuring means) is attached to the first water pipe 51, and the inflow turbidity meter and the inflow water quality prediction correction calculation section 24 of the control device 5 are electrically connected. You can also connect. Inflow water quality calculation unit 2
The NH4 concentration calculated and predicted in 3 is corrected by the inflow water quality prediction correction calculation unit 24 using the turbidity component concentration in the treated water flowing into the aeration tank 3 measured by the inflow turbidity meter.

Further, an inflow UV meter (inflow water UV value measuring means) for measuring the ultraviolet absorbance is attached to the first water pipe 51, and this inflow UV meter and the inflow water quality prediction correction calculation section 24 of the control device 5 are electrically connected. You can also connect to each other. The NH4 concentration calculated and predicted by the inflow water quality prediction calculation unit 23 uses the turbidity component concentration in the treated water flowing into the aeration tank 3 measured by this inflow UV meter to calculate the inflow water quality prediction correction calculation unit 2
Corrected in 4. That is, the inflow organic matter concentration in the water to be treated flowing into the aeration tank 3 has a high correlation with the inflow U.
Since it is affected by V, the concentration of the water quality component in the water to be treated can be calculated more accurately by correcting the concentration of the water quality component by the inflow UV.

Further, an inflow water thermometer (inflow water temperature measuring means) for measuring the water temperature of the water to be treated is attached to the first water pipe 51, and the inflow water temperature gauge and the inflow water quality prediction correction calculation unit 24 of the controller 5 Can also be electrically connected. The NH4 concentration calculated and predicted by the inflow water quality prediction calculation unit 23 uses the turbidity component concentration in the treated water flowing into the aeration tank 3 measured by the inflow water thermometer to calculate the inflow water quality prediction correction calculation unit 2
Corrected in 4.

Further, an inflow pH meter (inflow water pH measuring means) for measuring the pH of the water to be treated is attached to the first water pipe 51, and this inflow pH meter and the inflow water quality prediction correction calculation unit 24 of the control device 5 are provided. Can also be electrically connected. The NH4 concentration calculated and predicted by the inflow water quality prediction calculation unit 23 is corrected by the inflow water quality prediction correction calculation unit 24 using the pH of the water to be treated flowing into the aeration tank 3 measured by this inflow pH meter.

As described above, according to the present embodiment, the inflow water quality prediction calculation of the controller 5 is performed using the solid matter concentration in the water to be treated flowing into the aeration tank 3 measured by the inflow flow meter 9. By correcting the water quality component concentration in the water to be treated measured by the unit 23, a more accurate water quality component concentration can be obtained. As a result, the water to be treated can be subjected to a more accurate water quality component removal treatment in the aeration tank 3.

Further, different from the oxidation-reduction potentiometer 7, a water level gauge at the pump well, an inflow SS meter, an inflow turbidity meter, an inflow UV meter,
By correcting the water quality component concentration in the water to be treated on the basis of each measurement value measured by another sensor such as an inflow water thermometer or an inflow pH meter, a more accurate water quality component concentration can be obtained.

[0150]

As described above, according to the present invention,
An oxidation-reduction potentiometer for measuring the degree of oxidation or reduction of the water to be treated, which is used when controlling the water quality component treatment mechanism for removing the water quality component in the water to be treated, is installed in front of the aeration tank. Therefore, in the aeration tank, it is possible to quickly perform the water quality component removal treatment that corresponds to the property of the water to be treated. Therefore, even if the concentration of the water quality component in the water to be treated changes rapidly, the appropriate water quality component removal treatment can be performed with high efficiency and at low cost.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a water quality control device according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of a water quality control device according to the present invention.

FIG. 3 is a configuration diagram showing a modification of the second embodiment of the water quality control device according to the present invention.

FIG. 4 is a configuration diagram showing a third embodiment of a water quality control device according to the present invention.

FIG. 5 shows the relationship between the measurement time and the measurement value of the redox potentiometer,
It is a figure which shows the relationship between measurement time and the differential value of the measured value of an oxidation-reduction potentiometer.

FIG. 6 is a configuration diagram showing a fifth embodiment of a water quality control device according to the present invention.

FIG. 7 is a configuration diagram showing a conventional water quality control device.

FIG. 8 is a diagram showing a relationship between a value measured by an oxidation-reduction potentiometer, an NH4 concentration in inflow water flowing into an aeration tank, an NH4 concentration in treated water subjected to a water quality component removal treatment in the aeration tank, and time. .

[Explanation of symbols]

1 Water quality control device 2 First sedimentation tank 3 aeration tank 3a Anaerobic part 3b Anoxic part 3c Aerobic part 4 second sedimentation tank 5 control device 6 Water quality component treatment mechanism 7 Redox potentiometer 8 Filtration device 9 Inflow meter 10 Sludge treatment tank 11 Blower 12 Motorized valve 13 Air flow meter 14 air tubes 15 Air diffuser 21 Target air volume calculation unit 22 Airflow controller 23 Influent water quality calculation unit 24 Influent water quality prediction correction calculation unit 31 ultrafiltration membrane 32 filtered water tank 33 sand filter 51 First water piping 52 Second water pipe 53 Circulating water piping 54 Circulation pump 55 Return water piping 56 Return pump 57 Supply water piping 58 Discharged water piping 59 First filtered water piping 60 Second filtered water piping 61 First filtration return pipe 62 Second filtration return pipe 63 Filtration pump 64 Sludge water piping 65 Return water piping

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 11/00 C02F 11/00 C 11/14 11/14 B (72) Inventor Osamu Yamanaka Tokyo Fuchu No. 1 in Toshiba Fuchu Works, Toshiba Corporation (72) Inventor Yuio Motoki 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Head Office (72) Inventor Yoshihiro Shibamoto Minato-ku, Tokyo Shibaura 1-1-1 Toshiba Headquarters Office (72) Inventor Hatsuka Kazuo 1-30-1 Oyonaka, Kita-ku, Osaka-shi, Osaka Toshiba Kansai Branch F-term (reference) 4D028 AB00 AC01 AC09 BC01 BC14 BC18 BD08 BD16 BE08 CA01 CA09 CC01 CD01 CE01 4D040 BB05 BB07 BB32 BB57 BB65 BB72 BB92 4D059 AA04 AA05 BE55 CA28 DA16 DA35 EB02 EB11

Claims (14)

[Claims] 1. An aeration tank having a water quality component treatment mechanism for removing a specific water quality component in the water to be treated, and a stage installed before the aeration tank to measure the degree of oxidation or reduction of the water to be treated to the aeration tank. The redox electrometer and an inflow water quality prediction calculation unit that is connected to the redox electrometer and predicts the water quality component concentration in the treated water based on the relational expression between the measured value of the redox electrometer and the water quality component, and the inflow water quality A water quality control device comprising: a control unit that is connected to the prediction calculation unit and that controls the water quality component processing mechanism based on the water quality component concentration predicted by the inflow water quality prediction calculation unit. 2. A plurality of oxidation-reduction potentiometers are arranged in the flow direction of the water to be treated, and the inflow water quality prediction calculation unit measures each measured value by each oxidation-reduction potentiometer and the difference between each measured value and the water quality. The water quality control device according to claim 1, wherein a relational expression with components is stored. 3. A plurality of oxidation-reduction potentiometers are arranged in a direction that is vertical to the flow direction of the water to be treated, and the inflow water quality prediction calculation unit is provided for each of the oxidation-reduction potentiometers. The water quality control device according to claim 1, wherein a relational expression between the measured value and the difference between the measured values and the water quality component is stored. 4. The water quality control device according to claim 1, wherein a filter device is provided on the inlet side of the redox electrometer. 5. The water quality control device according to claim 4, wherein the filtration device has a membrane filtration mechanism. 6. The water quality control device according to claim 4, wherein the filtration device has a sand filtration mechanism. 7. A sludge treatment tank for sludge treatment, and a return water pipe for returning the sludge treatment return water sludge-treated in the sludge treatment tank to a stage preceding the aeration tank. The oxidation-reduction potentiometer is a return water pipe. The water quality control device according to any one of claims 1 to 6, wherein the degree of oxidation or reduction of the sludge treatment return water flowing through the tank is measured. 8. The inflow water quality prediction calculation unit predicts a change in the water quality component concentration in the treated water based on the change value of the measurement value of the redox electrometer, and the control unit predicts the inflow water quality prediction calculation unit. The water quality control device according to claim 1, wherein the water quality component processing mechanism is controlled based on the changed water quality component concentration and the change in the water quality component concentration. 9. An inflow water flow rate measuring means for measuring the flow rate of the water to be treated flowing into the aeration tank, and an inflow water quality predicting and calculating section connected to the inflow flow rate measuring means based on a measured value of the inflow water flow rate measuring means. The water quality control device according to any one of claims 1 to 8, further comprising: a correction calculation unit that corrects the concentration of the water quality component that is sent to the control unit. 10. An inflowing water solids concentration measuring means for measuring a concentration of solids contained in the water to be treated flowing into the aeration tank, and an inflowing waters solids concentration measuring means 9. A correction calculation unit that corrects the concentration of the water quality component sent from the inflow water quality prediction calculation unit based on the measured value and sends it to the control unit, further comprising any one of claims 1 to 8. Water quality control device described in. 11. Inflow water UV value measuring means for measuring the ultraviolet absorption of the water to be treated flowing into the aeration tank, and inflow water UV value measuring means are connected, based on the measurement values of the inflow water UV value measuring means. A correction calculation unit that corrects the concentration of the water quality component sent from the inflow water quality prediction calculation unit and sends it to the control unit,
The water quality control device according to any one of claims 1 to 8, further comprising: 12. An inflow water quality predicting calculation, which is connected to the inflow water temperature measuring means for measuring the water temperature of the treated water flowing into the aeration tank and is connected to the inflow water temperature measuring means based on the measured value of the inflow water temperature measuring means. 9. The water quality control device according to claim 1, further comprising a correction calculation unit that corrects the concentration of the water quality component sent from the unit and sends it to the control unit. 13. Inflow water pH measuring means for measuring the pH of the water to be treated flowing into the aeration tank, and inflow water quality prediction calculation based on the measured value of the inflow water pH measuring means, which is connected to the inflow water pH measuring means. 9. The water quality control device according to claim 1, further comprising a correction calculation unit that corrects the concentration of the water quality component sent from the unit and sends it to the control unit. 14. The water quality component in the water to be treated which is removed in the aeration tank is any one of ammonia nitrogen, total nitrogen, Kjeldahl nitrogen, phosphoric acid phosphorus, total phosphorus, fermentation products and easily decomposable organic substances. The water quality control device according to claim 1, wherein the water quality control device is one or a combination thereof.