KR20050074327A - Apparatus for controlling aeration air volume used in the sewage treatment plant - Google Patents

Abstract

A sewage treatment plant having a plurality of advanced treatment processes provides a device for controlling the amount of aeration air in a sewage treatment plant that can reduce operating costs incurred by aeration and can lower initial costs and maintenance costs.

On the basis of the first target value setting means 41 for setting the ammonia nitrogen concentration target value of the treated water and the dissolved oxygen concentration measurement value by the dissolved oxygen concentration meter of the aerobic tank of the series in which the ammonia system is installed, the other that does not have the ammonia meter installed. The second target value setting means (l32, 232) for setting the dissolved oxygen concentration target values of the series aerobic tanks respectively, and the aeration apparatus in the aerobic tank provided with the ammonia system, measure the ammonia nitrogen concentration to the ammonia nitrogen concentration target value. The controller 40, 130, 230 which calculates the aeration air volume target value which calculates the aeration air volume target value to calculate, and computes the aeration air volume target value which makes the measured value of dissolved oxygen concentration approach the dissolved oxygen concentration target value, respectively, Equipped.

Description

Aeration air volume control device of sewage treatment plant {APPARATUS FOR CONTROLLING AERATION AIR VOLUME USED IN THE SEWAGE TREATMENT PLANT}

The present invention relates to an aeration air volume control device of a sewage treatment plant including an aeration tank each having an aeration device, and having a plurality of series of sewage treatment processes of the same treatment system.

In the conventional sewage treatment plant, organic matters have been mainly removed by a process called activated sludge process, but in recent years, eutrophication is progressing in closed waters such as lakes, swamps, and bays. Increasingly, the demand for sewage treatment is increasing.

FIG. 10 is a flow chart showing a treatment system of this type of sewage treatment plant, and FIG. 11 is a flow chart showing the arrangement of a measuring instrument of the conventional aeration airflow control device applied to this sewage treatment plant together with the treatment system. The sewage treatment plant shown in FIG. 10 consists of three treatment systems of <series 1>, <series 2>, and <series 3>. And the sewage conveyed from the water pipe 50 is pumped into each series by the No. 1 inflow pump 1, the No. 2 inflow pump 101, and the No. 3 inflow pump 201, respectively. Since <series 1>, <series 2>, and <series 3> are comprised similarly, the detailed structure is demonstrated only about <series 1>.

The sewage conveyed from No. 1 inflow pump 1 flows into No. 1 initial sedimentation basin 2, and the suspension precipitates here. The outflow side of the first settling basin 2 is coupled to the inflow side of the first anaerobic tank 10 by a water pipe 51. The first anaerobic tank 11 and the first anaerobic tank 12 are sequentially connected to the first anaerobic tank 10. And the outflow side of the 1st aerobic tank 12 is couple | bonded with the inflow side of the 1st final sedimentation basin 13 by the water pipe 52, and it sends out the treated water to the outflow side of this 1st final sedimentation basin 13. The water pipe 60 is coupled. In addition, a water pipe 53 is coupled to the circulation pipe outlet of the No. 1 aerobic tank 12, and through the water pipe 53, the No. 1 circulation pump 14 supplies circulating water to the No. 1 anoxic tank 11. It is supposed to be done. In addition, the water pipe 54 and the water pipe 55 are coupled to the No. 1 final sedimentation basin 13, of which, the No. 1 conveying pump 15 is the No. 1 final sedimentation basin 13 through the water discharging pipe 54. A portion of the treated water is returned to the No. 1 anaerobic tank 10 and the No. 1 surplus pump 17 discharges the sludge through the water pipe 55. In addition, the No. 1 first settling pump 18 is coupled to the No. 1 first settling basin 2, and the No. 1 second hand drawing pump 18 is a sludge settled in the No. 1 first settling basin 2, the water pipe (58) Through, the discharge with the sludge of the first surplus pump 17.

As shown in FIG. 11, the 1st aeration tank 12 is equipped with the 1st aeration apparatus 9, and the 1st dissolved oxygen concentration meter 25 for control is provided in this. Then, the No. 2 dissolved oxygen concentration meter 125 in the No. 2 aerobic tank (not shown) of <Series 2> and the detailed description of the configuration is omitted, and the No. 3 dissolved oxygen in the No. 3 aerobic tank (not shown) of <Series 3>. Densitometers 225 are provided respectively. On the other hand, the process provided with an anaerobic tank, an anaerobic tank, and an aerobic tank in FIG. 10 is generally called A2O (Anaerobic-Anoxic-0xic) process.

Fig. 12 is a block diagram showing the structure of a conventional aeration amount control device for controlling the aeration devices 9 of <series 1 to 3>, and the dissolved oxygen concentration of the first aerobic tank 12 of <series 1> (hereinafter, , No. 1 control target value setter 31 for setting the target value of " DO ", No. 2 control target value setter 131 for setting the dissolved oxygen concentration target value of the second unit of <Series 2>, No. 3 control target value setting device 231 for setting the dissolved oxygen concentration target value of the No. 3 aerobic tank of <Series 3> is further provided, and the measured value of the dissolved oxygen concentration by the No. 1 dissolved oxygen concentration meter 25 is controlled by No. 1. 1 DO controller 30 for calculating the aeration air volume target value of the first aeration device 9 and the second dissolved oxygen concentration meter 125 so as to follow the dissolved oxygen target value of the target value setter 31. The width of the second aeration device 109 so that the measured value follows the control target value of the second control target value setter 131. No. 3 aeration device so that the measured value of the dissolved oxygen concentration by the No. 2 DO controller 130 and the No. 3 dissolved oxygen concentration meter 225 follow the control target value of the No. 3 control target value setter 231. The 3rd DO controller 230 which calculates the aeration air volume target value of 209 comprises a set of controllers.

11 and 12 show the installation position of the dissolved oxygen concentration meter and the control of the aeration device in the sewage treatment plant shown in FIG. 10, but instead of controlling the dissolved oxygen concentration, ammonia nitrogen The concentration can also be controlled. FIG. 13 shows the installation state of the ammonia system in this case. In the drawings, the same elements as in FIG. 11 are denoted by the same reference numerals and the description thereof will be omitted. In this case, the No. 1 ammonia system 26 is installed in the No. 1 aerobic tank 12, and the No. 2 ammonia system 126 is provided in the No. 2 aerobic tank (not shown) of <Series 2>, which has not been described in detail. No. 3 ammonia system 226 is provided in No. 3 aerobic tank (not shown) of <Series 3>, respectively.

Fig. 14 is a block diagram showing the configuration of the aeration amount control device for controlling the aeration devices 9, 109, and 209 of the <series 1 to 3>, and the ammonia nitrogen concentration of the first aerobic tank 12 of the <series 1>. No. 1 control target value setter 41 for setting the target value of the unit, No. 2 control target value setter 141 for setting the ammonia nitrogen concentration target value of the No. 2 aerobic tank of <Series 2>, and 3 of <Series 3> It is provided with the No. 3 control target value setter 241 which sets the ammonia nitrogen concentration target value of an aerobic tank, and the measured value of the ammonia nitrogen concentration by the No. 1 ammonia system 26 is a No. 1 control target value setter ( The measured value of the ammonia nitrogen concentration by the No. 1 ammonia controller 40 which controls the aeration amount of the No. 1 aeration apparatus 9, and the No. 2 ammonia system 126 so that following the ammonia nitrogen concentration target value of 41) is 2 No. 2 aeration length to follow the control target value of the call control target value setter 141 3 so that the measured value of the ammonia nitrogen concentration by the No. 2 ammonia controller 140 and the No. 3 ammonia system 226 that follow the control target value of the No. 3 control target value setter 241 is controlled. The No. 3 ammonia controller 240 which controls the aeration apparatus 209 comprises a set of controllers.

Here, since each sewage treatment of <series 1>, <series 2>, and <series 3> is the same, the process in <series 1> is demonstrated. The sewage supplied by the No. 1 inflow pump 1 precipitates a part of the sludge in the No. 1 initial sedimentation basin 2, and the settled sludge is the water supply pipe 58 by the No. 1 second hand drawing pump 18. Is sent to the final sludge discharge system. The first anaerobic tank 10, the first anaerobic tank 11, and the first anaerobic tank l2 are configurations of representative anaerobic-oxygen-aerobic (A2O) processes for simultaneously removing organic matter, nitrogen, and phosphorus. Hereinafter, the mechanism for removing nitrogen and phosphorus in this process will be described separately.

(a) removal of nitrogen

In the aerobic tank 12, by using the oxygen supplied from the aeration apparatus 9, the nitrifying bacteria are ammonia nitrogen (NH ₄ -N), nitrite nitrogen (NO ₂ -N), nitrate nitrogen ( NO ₃ -N). The nitrite nitrogen (NO ₂ -N) and the nitrate nitrogen (NO ₃ -N) transferred to the anoxic tank 11 by the circulation pump 14 are vaginal by denitrifying bacteria which nourish the organic matter in the influent sewage under anoxic conditions. It is reduced to nitrogen gas (N ₂ ) by acidic respiration or nitrous acid respiration and removed out of the system.

When the nitrogen removal reaction is expressed by the chemical formula, the nitriding reaction is

^{_{NH 4 + + 2O 2 → NO}} 2 - + 2H 2 O ... (One)

NO₂ ^-+ 1 / 2O₂→ NO₃ ^- … (2)

When the denitrification reaction describes the reaction when methanol is used as the organic substance,

6NO ₃ ⁻ + 5CH ₃ OH → 3N ₂ + 5CO ₂ + 7H ₂ O + 6OH ⁻ . (3)

It becomes

(b) removal of phosphorus

In the anaerobic tank 10 arranged in front of the aeration tank, phosphorus accumulating bacteria in the activated sludge accumulate organic acids such as acetic acid in the body and release phosphoric acid (PO ₄ ). In the aerobic tank 12 arranged at the rear of the aeration tank, the phosphorus in the form of excess phosphorus is discharged from the anaerobic tank 10 to utilize the phosphorus excess intake action. Phosphorus is removed by absorption into activated sludge.

 That is, in order to advance this reaction, organic acids, such as acetic acid, are needed. At the time of rainwater inflow, the concentration of organic acid decreases and the amount of organic matter available to the phosphorus accumulating bacteria decreases, so that the phosphorus discharge reaction is not sufficiently performed, so that the subsequent excessive intake reaction of phosphorus may be insufficient. You may not be able to get the quality of the water.

Therefore, to compensate for this, a coagulant storage tank for storing coagulants such as polyaluminum chloride, aluminum sulfate, and iron sulfate is provided, and the coagulant is injected to precipitate the phosphorus component in the form of aluminum phosphate or iron phosphate to remove phosphorus. There is also a way. The chemical formula in this case is expressed as follows.

A1 ³⁺ + PO ₄ ^3- → AlPO ₄ ... (4)

In the sewage treatment plant, nitrogen, phosphorus and phosphorus are managed by appropriately operating the conveying pumps, circulation pumps, surplus sludge drawing pumps, and aeration apparatuses of each series to appropriately manage the return flow rate, circulation flow rate, surplus sludge draw amount, and aeration air volume. It is necessary to operate so that organic matter does not exceed the regulation of each discharge water quality.

Among these, the aeration device 9 supplies dissolved oxygen required when removing nitrogen, phosphorus and organic matter by microorganisms, and accounts for 40 to 60% of the operating cost of the sewage treatment plant. If the amount of dissolved oxygen supplied from the aeration device 9 is too small, the water quality deteriorates. On the other hand, when supply volume increases, operation cost will be high. That is, by appropriately controlling the aeration apparatus, it is possible to achieve maintenance of water quality and reduction of operating costs.

The conventional aeration air volume control device shown in Figs. 11 and 12 uses the measured values of the dissolved oxygen concentration meters 25, 125, and 225 installed in the aerobic tanks of each series to the control target values set in the control target value setters 3l, 131, and 231. The aeration apparatus 9, 109, and 209 are comprised so that each may be controlled (for example, Unexamined-Japanese-Patent No. 11-244894). On the other hand, the another aeration air volume control device shown in Figs. 13 and 14, the measurement value of the ammonia-based (26, 126, 226) installed in each arc tank of each series is set in the control target value setter (41, 141, 241) The aeration devices 9, 109, and 209 are configured to be controlled so as to be the control target values (see, for example, Japanese Patent Laid-Open No. 2003-200190).

The aeration air volume control apparatus shown in FIG. 11 and FIG. 12 uses a dissolved oxygen concentration meter which is inexpensive and easy to maintain compared to the ammonia system, and has a low initial cost and easy maintenance, while indirectly called dissolved oxygen. Since the control is performed based on the surface of the surface, it is necessary to operate at a high dissolved oxygen target value in order to maintain the discharge water quality at all times, which increases the operating cost of aeration.

On the other hand, compared with the apparatus shown in FIG. 11 and FIG. 12, the aeration air volume control apparatus shown in FIG. 13 and FIG. 14 has a high initial cost, and it is difficult to maintain and maintain a sensor. On the other hand, the nitriding rate of nitride is slower than the removal rate of organic matter and phosphorus absorption rate. Therefore, if oxygen required for nitriding is supplied, the amount of air required to remove organic matter, phosphorus and nitrogen can be secured. Since aeration is controlled using the ammonia nitrogen concentration as an index, the running cost of the aeration can be reduced while maintaining the discharge water quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in a sewage treatment plant having a plurality of advanced treatment processes, it is possible to reduce operating costs incurred in aeration compared to an aeration air volume control device that uses a dissolved oxygen concentration meter to control dissolved oxygen. It is also an object of the present invention to provide an aeration air volume control device of a sewage treatment plant that can reduce the initial cost and the maintenance cost lower than the aeration air volume control device that controls ammonia nitrogen concentration using each ammonia system of each series. It is done.

The first invention of the present application,

In the aeration air volume control device of a sewage treatment plant, each containing an aeration tank having an aeration device operating according to the aeration air volume target value, and having a plurality of series of sewage treatment processes of the same treatment method,

Flow control means for controlling the flow rate of sewage flowing into all the series to be the same;

An ammonia system for measuring the ammonia nitrogen concentration in the aerobic tank of any one of a plurality of series;

Dissolved oxygen concentration meter which measures dissolved oxygen concentration of aerobic tank of all series of plural series,

First target value setting means for setting ammonia nitrogen concentration target value of the treated water;

Second target value setting means for respectively setting the dissolved oxygen concentration target values of the aerobic tanks of the other series in which the ammonia system is not installed, based on the dissolved oxygen measured values of the aerobic tanks of the aerobic tanks of the series in which the ammonia system is installed;

Dissolved oxygen concentration is calculated by calculating the aeration air flow rate target value at which the ammonia-based aeration system is provided with an ammonia nitrogen concentration measurement value approaching the ammonia nitrogen concentration target value. To calculate the aeration air volume target that brings the measured value closer to the dissolved oxygen concentration target.

Aeration air volume control device of the sewage treatment plant characterized in that it comprises a.

 The second invention of the present application,

 In the aeration air volume control device of a sewage treatment plant, each containing an aeration tank having an aeration device operating according to the aeration air volume target value, and having a plurality of series of sewage treatment processes of the same treatment method,

Flow control means for controlling the flow rate of sewage flowing into all the series to be the same;

An ammonia system for measuring the ammonia nitrogen concentration in the aerobic tank of any one of a plurality of series;

Target value setting means for setting ammonia nitrogen concentration target value of the treated water;

Diffuser efficiency input means for inputting diffuser efficiency of the aeration apparatus for each series;

An aerator efficiency ratio calculation means for obtaining an aerator efficiency ratio of each aerobic aeration tank of another series to an aerobic tank of an aerobic tank in which an ammonia system is installed, on the basis of the inputted aerobic efficiency, respectively;

A controller for calculating an aeration air volume target value for bringing the ammonia nitrogen concentration measurement value with the aeration system in the aerobic tank provided with an ammonia system closer to the ammonia nitrogen concentration target value;

 Aeration air volume calculation means for calculating the aeration air volume target value calculated by the controller by multiplying the aeration efficiency ratio by the aerobic efficiency ratio, and calculating the aeration air volume target value of the aerobic aeration apparatus in which no ammonia system is installed;

Aeration air volume control device of the sewage treatment plant characterized in that it comprises a.

The third invention of the present application,

In the aeration air volume control device of a sewage treatment plant, each containing an aeration tank having an aeration device operating according to the aeration air volume target value, and having a plurality of series of sewage treatment processes of the same treatment method,

 Inflow flow meter which measures flow of sewage flowing into every series,

 An ammonia system for measuring the ammonia nitrogen concentration in the aerobic tank of any one of a plurality of series;

Target value setting means for setting ammonia nitrogen concentration target value of the treated water;

Diffuser efficiency input means for inputting the diffuser efficiency of the aerator for each series;

An aerator efficiency ratio calculation means for obtaining an aerator efficiency ratio of each aeration tank of another aerobic tank with respect to an aeration tank of one aerobic tank provided with an ammonia system, on the basis of the respectively entered aerator efficiency;

 A controller for calculating an aeration air flow rate target value for bringing the ammonia-nitrogen aeration device to an ammonia-based aeration device closer to the ammonia nitrogen concentration target value;

 Air magnification calculating means for calculating the air magnification of the series from the flow rate of sewage flowing into the series including an aerobic tank provided with an ammonia system and the aeration air volume of the aeration apparatus;

The aeration air volume target value calculated by the controller is multiplied by the air magnification, and the aeration air volume target value obtained by multiplying this value, the value obtained by multiplying the acid efficiency efficiency ratio by the input acid efficiency, and the measured flow rate of the inflowing sewage, where no ammonia meter is installed. Aeration air volume calculating means for calculating an aeration air volume target value of the aeration apparatus of an aerobic tank,

Aeration air volume control device of the sewage treatment plant characterized in that it comprises a.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on the suitable Example shown in drawing.

Example 1

1 is a system diagram showing a treatment system of a sewage treatment plant to which a first embodiment of the present invention is applied, together with an arrangement of instruments, and the same elements as those in FIG. do. Here, in order to control the aeration apparatus of each aerobic tank of each series, the point which the No. 1 dissolved oxygen concentration meter 25 and the ammonia system 26 are provided differs from a structure with FIG. 1L or FIG. 13, except this FIG. Or it is comprised similarly to FIG. On the other hand, these No. 1 dissolved oxygen concentration meter 25, the ammonia system 26, the No. 2 dissolved oxygen concentration meter 125, and the No. 3 dissolved oxygen concentration meter 225 are provided in the same position in the flow direction of sewage.

Fig. 2 is a block diagram showing the construction of the first embodiment of the present invention applied to the sewage treatment plant. The apparatus is based on the measured value of the No. 1 control target value setter 41 and the No. 1 dissolved oxygen concentration meter 25 which set the ammonia nitrogen concentration target value of the No. 1 aerobic tank 12 of the <Series 1>. Based on the measured values of the No. 2 control target value calculator 132 and the No. 1 dissolved oxygen concentration gauge 25, the dissolved oxygen concentration target value of the No. 3 aerobic tank of <Series 3> is calculated. It is provided with the 3rd control target value calculator 232 which calculates and the measured value of the ammonia nitrogen concentration by the ammonia system 26 follows the target value of the ammonia nitrogen concentration of the 1st control target value setter 41. The measured value of dissolved oxygen concentration by the No. 1 ammonia controller 40 and the No. 2 dissolved oxygen concentration meter 125 which control the aeration amount of the No. 1 aeration apparatus 9 are the The aeration amount of the second aeration device 109 is adjusted so as to follow the control target value. No. 3 aeration device 209 so that the measured DO concentration of the No. 2 DO controller 130 and the No. 3 dissolved oxygen concentration meter 225 follow the control target value of the No. 3 control target value calculator 232. Equipped with a third DO controller 230 for controlling them, they constitute one controller.

In this case, the No. 1 dissolved oxygen concentration meter 25 is connected to each input terminal of the No. 2 control target value calculator 132 and the No. 3 control target value calculator 232 by the signal line 25a. Further, the output terminals of the No. 1 control target value setter 41, No. 2 control target value calculator 132, and No. 3 control target value calculator 232 are connected to the No. 1 ammonia controller 40 by the signal lines 41a, 132a, and 232a. ), 2 DO controller 130 and 3 DO controller 230 are connected to each input terminal of No. 1 ammonia system 26, No. 2 dissolved oxygen concentration meter 125 and No. 3 dissolved oxygen concentration meter 225 The signal lines 26a, 125a, and 225a are connected to the other input terminals of the No. 1 ammonia controller 40, the No. 2 DO controller 130, and the No. 3 DO controller 230. Further, the output terminals of the No. 1 ammonia controller 40, the No. 2 DO controller 130, and the No. 3 controller 230 are connected to the No. 1 aeration apparatus 9 and No. 2 by the signal lines 26b, 125b, and 225b. It is connected to the apparatus 109 and the 3rd aeration apparatus 209.

The operation of the first embodiment configured as described above will be described below, particularly with reference to a portion different from the conventional apparatus. The sewage flowing into the sewage treatment plant is supplied to the <series 1, 2, 3> by the first inflow pump 1, the second inflow pump 101 and the third inflow pump 201 from the water pipe 50. do. The 1st inflow pump 1, the 2nd inflow pump 101, and the 3rd inflow pump 201 are controlled by the control apparatus not shown in figure so that the amount of inflow which flows into each series may be equivalent. The measured value of the No. 1 ammonia system 26 installed in the No. 1 aerobic tank 2 is transmitted to the No. 1 ammonia controller 40 via the signal line 26a. The No. 1 ammonia controller 40 is, for example, by a PI controller as shown in formulas (5) and (6) so as to comply with the ammonia nitrogen concentration target value set in the No. 1 control target value setter 41. The air volume target value of the 1st aeration apparatus 9 is computed.

only,

Qair1 (t): No. 1 aeration air volume target value at time t (m ³ / min)

Qair ₀₁ : No. 1 Aeration Air Flow Rate Initial Value (m ³ / min)

Kp: proportional gain (m ⁶ / g · min)

T _I : integral constant (min)

Δt: control period (min)

e (t): deviation (mg / L)

SV _NH41 (t): No. 1 ammonia nitrogen concentration target (mg / L)

PV _NH41 (t): Ammonia _reading (mg / L)

to be.

The first aeration device 9 adjusts the airflow volume by adjusting the opening degree of the airflow control valve and the inverter control of the aeration device (blower) so as to comply with the airflow target value calculated by the equations (5) and (6). Adjust. In addition, the measured value of the No. 1 aerobic tank dissolved oxygen concentration meter 25 at this time is transmitted to the No. 2 control target value calculator 132 and the No. 3 control target value calculator 232 via the signal line 25a.

The No. 2 control target value calculator and the No. 3 control target value calculator have a fixed period (a period of 5 minutes to 30 minutes), and the values obtained by filtering the measured values of the dissolved oxygen meter 25 by the formula (7) are signal lines 132a, Via the signal line 232a, it transmits to the 2nd DO controller 130 and the 3rd DO controller 230, respectively.

only,

PVf _O2 (t): No. 1 dissolved oxygen concentration filter at time t

PV _O2 (t): No. 1 dissolved oxygen meter reading at time t

n: integer

to be.

The 2nd DO controller 130 and 3rd DO controller 230 are as shown to a formula (8), (9) so that it may comply with the output value from the 2nd control target value calculator and the 3rd control target value calculator. The same quantity of air volume target values of the 2nd aeration apparatus 109 and the 3rd aeration apparatus 209 are computed by the same PI controller.

only,

Qairn (t): n number of aeration air volume targets at time t (m ³ / min)

Qair _On : No. n aeration air volume initial value (m ³ / min)

Kp: proportional gain (m ⁶ / g · min)

T _I : integral constant (min)

Δt: control period (min)

e (t): deviation (mg / L)

SV _O2n (t): n dissolved oxygen concentration target (mg / L)

PV _O2n (t): No. n dissolved oxygen concentration meter (mg / L) (n = 2, 3)

to be.

 The 2nd aeration device 109 and the 3rd aeration device 209 adjust the opening degree of an airflow control valve, and inverter control of an aeration device (blower) so that it may comply with the airflow target value computed by Formula (8), (9), respectively. Adjust the air volume by

According to the first embodiment, compared to the apparatus shown in Figs. 13 and 14, the number of ammonia systems, which are high in initial cost and complicated to maintain, is reduced, and 2 and 3 of <Series 2> and <Series 3> are reduced. Since the air volume of the arc breathing tank is controlled by the variable DO target value, the air volume reduction effect can be expected as compared with the apparatus shown in FIGS. 11 and 12.

Moreover, since control of DO of each series is made equal, it is applicable also when the aeration efficiency of an aeration apparatus differs. In particular, when additional paper is added, an aeration device having a different acid efficiency may be provided, and this control method becomes effective.

Example 2

3 is a system diagram showing a treatment system of a sewage treatment plant to which a second embodiment of the present invention is applied, together with an arrangement of measuring instruments, in which the same elements as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Here, in order to control the aeration apparatus of each aerobic tank of each series, only the ammonia system 26 is installed in the 1st aerobic tank 12 of <Series 1>, and dissolved oxygen is carried out in any aerobic tank of <Series 1, 2, 3>. The structure is different from FIG. 1 in that the densitometer is not provided.

4 is a block diagram showing the configuration of the aeration air volume control device according to the second embodiment. Here, the No. 1 ammonia system 26 is connected to one input terminal of the No. 1 ammonia controller 40 by the signal line 26a, and the No. 1 control target value setter 41 is connected to the No. 1 ammonia controller by the signal line 41a. It is connected to the other input terminal of 40, and the output terminal of this No. 1 ammonia controller 40 is connected to the 1st aeration apparatus 9 by the signal line 26b. Further, the first aeration device diffuser efficiency input section 43, the second aeration device diffuser efficiency input section 143, and the third aeration device diffuser efficiency input section 243, which predetermine respective diffuser efficiency of the <series 1, 2, 3> are set. Is newly added, and the first to second aerator efficiency ratio calculation unit 144 for calculating the aerator efficiency ratio of the second aerator 109 to the first aerator aerator efficiency input unit 43, and the first aerator A unit number one to three unit efficiency ratio calculating unit 244 for calculating the unit efficiency ratio of the three aerators 209 with respect to the apparatus diffuser efficiency input unit 43 is provided. Further, a No. 2 aeration air flow rate calculating unit that calculates the aeration air volume of the No. 2 aeration device 109 by multiplying the aeration air volume output from the No. 1 ammonia controller 40 by the output of the No. 1 to No. 2 aerator efficiency ratio calculating unit 144. No. 3 which calculates the aeration air volume of No. 3 aeration apparatus 209 by multiplying 145 and the aeration volume output from No. 1 ammonia controller 40 by the output of the No. 1 to No. 3 acid efficiency efficiency calculating part 244. An aeration air volume calculating unit 245 is provided, and these output ends thereof are connected to the No. 2 aeration device 109 and the No. 3 aeration device 209 by signal lines, respectively.

The operation of the second embodiment configured as described above will be described below. The sewage flowing into the sewage treatment plant is supplied to the <series 1, 2, 3> by the first inflow pump 1, the second inflow pump 101, and the third inflow pump 201 from the water pipe 50. do. Nos. 1 to 3 inflow pumps are controlled by control means (not shown) so that the inflow amount flowing into each series is the same. The measured value of the ammonia system 26 installed in the 1st aerobic tank 12 is transmitted to the 1st ammonia controller 40 by the signal line 26a. The No. 1 ammonia controller 40 uses a PI controller as shown in equations (10) and (11) so as to comply with the ammonia nitrogen concentration target value set in the No. 1 control target value setter 41, for example. The air volume target value of the aeration apparatus 9 is calculated.

only,

Qair1 (t): No. 1 aeration air volume target value at time t (m ³ / min)

Qair ₀₁ : No. 1 Aeration Air Flow Rate Initial Value (m ³ / min)

Kp: proportional gain (m ⁶ / g · min)

T _I : integral constant (min)

Δt: control period (min)

e (t): deviation (mg / L)

SV _NH41 (t): No. 1 ammonia nitrogen concentration target (mg / L)

PV _NH41 (t): Ammonia _reading (mg / L)

to be.

The first aeration device 9 adjusts the airflow amount by adjusting the opening degree of the airflow control valve and the inverter control of the aeration device (blower) so as to comply with the aeration airflow target values calculated by the equations (10) and (11). In addition, in the 1st to 2nd acidity efficiency ratio calculating part 144 and the 1st to 3rd acidity efficiency ratio calculating part, it calculates to ammonia system by the calculation shown by (12), (13) based on the inputted acidity efficiency. The arithmetic efficiency ratio of the series (<series 1>) and other series which are controlled by the control is calculated.

C ₁₂ = K1 ₂ / Kl ₁ . (12)

C ₁₃ = K _{1 3} / Kl ₁ . (13)

only,

C ₁₂ : 1 to 2 diffuser efficiency ratio

C ₁₃ : 1 to 3 diffuser efficiency ratio

Kl ₁ : No. 1 aeration device

K1 ₂ : No. 2 Aerator Efficiency

K1 ₃ : No. 3 aeration efficiency

to be.

The aerator efficiency ratio calculated here is a No. 2 aeration air volume calculation unit 145 and a No. 3 aeration air volume calculation unit 245, respectively, together with the No. 1 aeration air volume target value at the time t calculated by the equations (10) and (11). Is sent, the aeration air volume target value is calculated by the calculation of the formulas (14) and (15).

Qair2 (t) = C ₁₂ Qairl (t). (14)

Qair3 (t) = C ₁₃ Qair1 (t). (15)

only,

Qairn (t): n-number aeration air volume target value at time t (m ³ / min) (n = 1 to 3)

C ₁₂ : 1 to 2 diffuser efficiency ratio

C ₁₃ : 1 to 3 diffuser efficiency ratio

The number 2 aeration device 109 and the number 3 aeration device 209 adjust the opening degree of the air volume control valve and the inverter of the aeration device (blower) so as to comply with the air volume target values calculated by the equations (14) and (15), respectively. The air volume is adjusted by the control.

According to the second embodiment, it is necessary to set the correct diffuser efficiency in advance in the input unit, but compared with the conventional aeration air volume control apparatus shown in Figs. 13 and 14, the number of ammonia-based systems having a high initial cost and complicated maintenance. The air volume of the No. 2 aeration device 109 of <Series 2> and the No. 3 aeration device 209 of <Series 3> can be controlled. Moreover, unlike Example 1, since it does not use a dissolved oxygen concentration meter for control but controls only by an ammonia system, there is no control abnormality by the abnormality of a dissolved oxygen concentration meter, and stability improves.

Example 3

FIG. 5 is a system diagram showing a treatment system of a sewage treatment plant to which a third embodiment of the present invention is applied, together with an arrangement of measuring instruments. In the drawings, the same elements as in FIG. Here, the No. 1 inflow flow meter 5 is disposed on the effluent sending side of the No. 1 inflow pump 1 of the series (l), and the No. 2 inflow flow meter ( 105 differs from FIG. 3 in that the No. 3 inflow flowmeter 205 is provided on the sewage outflow side of the No. 3 inflow pump 201 of <Series 3>, respectively.

6 is a block diagram showing the configuration of the aeration air volume control device according to the third embodiment. Here, the same elements as in Fig. 4 showing the second embodiment are denoted by the same reference numerals and the description thereof will be omitted. In the 3rd Example shown in FIG. 6, the aeration volume of the 1st aeration apparatus 9 was made into input of the aeration air volume target value of the 1st ammonia controller 40, and the measured value of the 1st inflow flowmeter 5 as another input. The No. 1 air magnification calculating unit 246 for calculating the magnification of the air volume is newly provided, and the No. 2 aeration air volume calculating unit 145 is the No. 1 to No. 2 diffuser efficiency ratio calculating unit 144, No. 2 inflow flow meter 105, and 1 The aeration air volume target value for the 2nd aeration device 109 is calculated based on the angular output of the call air magnification calculation unit 246, and the 3rd aeration airflow rate calculation unit 245 is the 1st to 3rd aerator efficiency ratio calculation unit 244. On the basis of the outputs of the No. 3 inflow flow meter 205 and the No. 1 air magnification calculating unit 246, the points configured to calculate the aeration air volume target values for the No. 3 aeration device 209 are the same as those of the second embodiment shown in FIG. The structure is different and it is comprised similarly to FIG. 4 except this.

The operation of the third embodiment configured as described above will be described below. The sewage flowing into the sewage treatment plant is supplied to the <series 1, 2, 3> by the first inflow pump 1, the second inflow pump 101, and the third inflow pump 201 from the water pipe 50. do. The measured value of the ammonia system 26 installed in the 1st aerobic tank 12 is transmitted to the 1st ammonia controller 40 by the signal line 26a. No. 1 ammonia controller 40 is aerated by the PI controller as shown in equations (16) and (17) so as to comply with the ammonia nitrogen concentration target value set in the No. 1 control target value setter 41, for example. The air volume target value of the device 9 is calculated.

only,

Qair1 (t): No. 1 aeration air volume target value at time t (m ³ / min)

Qair ₀₁ : No. 1 Aeration Air Flow Rate Initial Value (m ³ / min)

Kp: proportional gain (m ⁶ / g · min)

T _I : integral constant (min)

Δt: control period (min)

e (t): deviation (mg / L)

SV _NH41 (t): No. 1 ammonia nitrogen concentration target (mg / L)

PV _NH41 (t): Ammonia _reading (mg / L)

to be.

The first aeration device 9 adjusts the airflow amount by adjusting the opening degree of the airflow control valve and the inverter control of the aeration device (blower) so as to comply with the aeration airflow target values calculated by the equations (16) and (17).

In addition, in the 1st to 2nd acidity efficiency ratio calculating part 144 and the 1st to 3rd acidity efficiency ratio calculating part 244, based on the inputted acidity efficiency, it is based on the calculation shown by (18), (19) formula. The acid efficiency ratios of the series (<series 1>) and other series that are controlled by the ammonia series are calculated.

C ₁₂ = K1 ₂ / Kl ₁ . (18)

C ₁₃ = K _{1 3} / Kl ₁ . (19)

only,

C ₁₂ : 1 to 2 diffuser efficiency ratio

C ₁₃ : 1 to 3 diffuser efficiency ratio

Kl ₁ : No. 1 aeration device

K1 ₂ : No. 2 Aerator Efficiency

K1 ₃ : No. 3 aeration efficiency

to be.

On the other hand, in the No. 1 air magnification calculating unit 246, the No. 1 air is expressed by the equation (20) from the measured value of the No. 1 inflow flowmeter 5 and the no. 1 aeration air volume target value calculated by the equations (16) and (17). The magnification is calculated.

A1 (t) = Qair1 (t) / Qin1 (t)... 20

only,

A1 (t): No. 1 Air Magnification

Qair1 (t): No. 1 aeration air volume target value at time t (m ³ / min)

Qin1 (t): No. 1 inflow flow rate (m ³ / min)

to be.

Here, the calculated No. 1 air magnification is No. 1 to No. 2 acid efficiency efficiency ratio, No. 1 to No. 3 acid efficiency efficiency ratio, No. 2 inflow flowmeter 105 and No. 3 calculated by the formulas (18) and (19). Together with the measured values of the inflow flowmeter 205, the aeration air volume calculation unit 145 and the 3 aeration air volume calculation unit 245 are respectively transmitted, and the aeration air volume target values are calculated by the calculation formulas (21) and (22). do.

Qair2 (t) = C ₁₂ A1 (t) Qin ₂ (t). (21)

Qair3 (t) = C ₁₃ A1 (t) Qin ₃ (t). (22)

only,

Qair2 (t): 2nd aeration air volume target value at time t (m ³ / min)

Qair3 (t): No. 3 aeration air volume target value at time t (m ³ / min)

C ₁₂ : 1 to 2 diffuser efficiency ratio

C ₁₃ : 1 to 3 diffuser efficiency ratio

A1 (t): No. 1 Air Magnification

Qin ₂ (t): No. 2 inflow flow at time t (m ³ / min)

Qin ₃ (t): No. 3 inflow flow at time t (m ³ / min)

to be.

The number 2 aeration device 109 and the number 3 aeration device 209 adjust the opening degree of the air volume control valve and the inverter of the aeration device (blower) so as to comply with the air volume target values calculated by the equations (21) and (22), respectively. The air volume is adjusted by control.

According to the third embodiment, compared with the conventional aeration air volume control devices shown in Figs. 13 and 14, the number of ammonia systems having a high initial cost and complicated maintenance is reduced, and the No. 2 aeration device of <Series 2> ( 109 and the air volume of the 3rd aeration device 209 of <series 3> can be controlled. Moreover, unlike Example 1, since it does not use a dissolved oxygen concentration meter for control, but controls only by an ammonia system, there is no control abnormality by the abnormality of a dissolved oxygen concentration meter, and stability improves. In addition, compared with the first and second embodiments, a new effect can be obtained even when the amount of sewage flowing into each series is different.

Example 4

7 is a system diagram showing a treatment system of a sewage treatment plant to which a fourth embodiment of the present invention is applied, together with an arrangement of measuring instruments, in which the same elements as in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Here, the inflow flowmeter 3 and the nitrogen which flows into the original water pipe which classifies sewage by the 1st inflow pump 1, the 2nd inflow pump 101, and the 3rd inflow pump 201 are shown. A nitrogen ammonia controller 40 (Fig. 1) is obtained by providing an inflow total nitrogen meter 4 to be measured and multiplying the inflow flow meter measurement value with the inflow total nitrogen measurement value by, for example, multiplication means (not shown). Reference), and calculate the air volume target value of the first aeration device by, for example, the formulas (23), (24) and (25). In this way, the calculation of the air volume target value of the aeration apparatus using the nitrogen loading information is not limited to the first embodiment, but can be applied to any of the second and third embodiments.

only,

Qair1 (t): No. 1 aeration air volume target value at time t (m ³ / min)

Aair1 (t): No. 1 nitrogen load air power factor calculation value (m ³ / g)

TN (t): total nitrogen measurement (mg / L)

Qin (t): inflow meter reading (m ³ / min)

Aair ₀₁ : No. 1 Nitrogen Load Air Scale Factor

Kp: proportional gain (m ⁶ / g ² )

T _I : integral constant (min)

Δt: control period (min)

e (t): deviation (mg / L)

SV _NH41 (t): No. 1 ammonia nitrogen concentration target (mg / L)

PV _NH41 (t): Ammonia _reading (mg / L)

to be.

In addition, the measurement of nitrogen before inflow may be provided in the piping of the front end or the rear end of each initial settling basin of <series 1, 2, 3>, and may add each measured value. In Examples 1 to 3, since the inflow flow rate is controlled to be equal to each region, even if it is not a flow meter measuring the total flow rate as in the present embodiment, only the flow rate of each series is measured. All incoming nitrogen can be measured.

According to the fourth embodiment, in addition to the effect that the operating cost of aeration can be reduced, and the initial cost and the maintenance cost can be reduced, the nitrogen load information of the inflowing sewage is taken in. Thus, ammonia nitrogen A new effect of increasing the target value followability of the concentration control is also obtained.

Example 5

FIG. 8 is a system diagram showing a treatment system of a sewage treatment plant to which a fifth embodiment of the present invention is applied, together with an arrangement of instruments, in which the same elements as in FIG. 5 to which the third embodiment is applied are denoted by the same reference numerals. The description is omitted. Here, in the No. 1 aerobic tank 12 of <Series 1>, a No. 1 dissolved oxygen concentration meter 25 is provided in addition to the No. 1 ammonia system 26, and in a No. 2 aerobic tank of <Series 2>, not shown in the drawings. The No. 2 dissolved oxygen concentration meter 125 and the No. 3 dissolved oxygen concentration meter 225 are respectively provided in the No. 3 aerobic tank, in which the illustration of <Series 3> is omitted, and the configuration is different from that in FIG. The same is configured.

9 is a block diagram showing the configuration of the aeration air volume control device according to the fifth embodiment. The same elements as those in Fig. 6 showing the third embodiment are denoted by the same reference numerals and the description thereof will be omitted. In this embodiment, the first DO limiter device is provided at the output terminals of the No. 1 ammonia controller 40, the No. 2 aeration air flow rate calculating unit 145, and the No. 3 aeration air volume calculating unit 245 constituting the third embodiment shown in FIG. (47), the 2nd DO limiter apparatus 147 and the 3rd DO limiter apparatus 247 differ from the structure of FIG. 6, and it is comprised similarly to FIG. 6 except this. On the other hand, No. 1 DO limiter 47, No. 2 DO limiter 147 and No. 3 DO limiter 247 are No. 1 dissolved oxygen concentration meter 25, No. 2 dissolved oxygen concentration meter 125 and 3, respectively. Based on the measured value of the dissolved dissolved oxygen concentration meter 225, a limit is imposed on the air volume target value of the aeration device of each series.

The operation of the fifth embodiment configured as described above will be described below. The lower limit and the upper limit of the dissolved oxygen concentration are set in the first DO limiter device 47, the second DO limiter device 147, and the third DO limiter device 247. When the measured values of the No. 1 dissolved oxygen concentration meter 25, the No. 2 dissolved oxygen concentration meter 125, and the No. 3 dissolved oxygen concentration meter 225 are between the set upper and lower limits, respectively, the same operation as in the third embodiment is performed. However, when the measured values of the No. 1 dissolved oxygen meter 25, the No. 2 dissolved oxygen meter 125 and the No. 3 dissolved oxygen meter 225 deviate from the set upper and lower limits, respectively, the equations (26), (27) and As shown in (29) and (30) Formula 1 DO limiter apparatus 47 and 2 DO limiters so that it may change into dissolved oxygen concentration constant control which made the lower limit or upper limit into target value, and DO does not deviate from the upper and lower limits. The device 147 and the 3 DO limiter device 247 operate. Formulas of the DO limiter are shown in formulas (26) to (30).

only,

Q'airn (t): n-number aeration air volume target output value at time t (m ³ / min)

Q'air _0n : Initial number of aeration aeration volume (m ³ / min)

Qairn (t): No. n aeration air volume target DO limiter device input at time t (m ³ / min)

Kp: proportional gain (m ⁶ / g · min)

T _I : integral constant (min)

Δt: control period (min)

e (t): deviation (mg / L)

DOmin: lower dissolved oxygen concentration (mg / L)

DOmax: upper limit of dissolved oxygen concentration (mg / L)

PV _O2n (t): No. n dissolved oxygen concentration meter (mg / L) (n = 1 to 3)

to be.

According to the fifth embodiment, when the dissolved oxygen concentration is to exceed the lower limit or the upper limit, the dissolved oxygen concentration constant control is set to the lower limit or the upper limit, so that the treated water quality can be maintained in a certain range.

In addition, although each said embodiment was applied to the treatment system of a sewage water treatment plant equipped with an A2O process, this invention is not limited to this, A standard activated sludge process, a cyclic nitridation denitrification process, an AO process, a carrier input Any treatment system can be used as long as it is a sewage treatment process that performs aeration such as a mold process and a step inflow process.

In addition, the number of series is not limited to three series as in the embodiment, and any number of series can be applied as long as it is two or more.

In addition, the aeration device is a device for supplying air from one aeration device to a plurality of series, as in the embodiment described above, and is controlled so as to adjust the amount of aeration air by controlling an air regulating valve on the pipe. You may comprise.

In addition, the installation position of the ammonia system may be any part of the aeration tank performing aeration.

 By constructing as described above, the present invention can reduce the operating cost of aeration compared to the aeration air volume control device that controls the dissolved oxygen using a dissolved oxygen concentration meter in a sewage treatment plant having a plurality of advanced treatment processes. Moreover, the aeration air volume control apparatus of a sewage treatment plant which can suppress initial cost and maintenance cost lower than the aeration air volume control apparatus which controls ammonia nitrogen concentration using each ammonia system of each series is provided.

1 is a system diagram showing a treatment system of a sewage treatment plant to which a first embodiment of the present invention is applied together with an arrangement of a measuring instrument;

Fig. 2 is a block diagram showing the construction of the first embodiment of the present invention.

3 is a system diagram showing a treatment system of a sewage treatment plant to which a second embodiment of the present invention is applied together with an arrangement of a measuring instrument;

4 is a block diagram showing a configuration of a second embodiment of the present invention.

5 is a system diagram showing a treatment system of a sewage treatment plant to which a third embodiment of the present invention is applied, together with an arrangement of a measuring instrument;

Fig. 6 is a block diagram showing the construction of the third embodiment of the present invention.

FIG. 7 is a schematic diagram showing a treatment system of a sewage treatment plant to which the fourth embodiment of the present invention is applied together with an arrangement of a measuring instrument; FIG.

8 is a system diagram showing a treatment system of a sewage treatment plant to which a fifth embodiment of the present invention is applied, together with an arrangement of a measuring instrument;

Fig. 9 is a block diagram showing the construction of the fifth embodiment of the present invention.

10 is a system diagram of a sewage treatment plant removing nitrogen and sidewalks in addition to organic matter.

FIG. 11 is a system diagram showing an arrangement of a measuring instrument of a conventional aeration airflow control device applied to the sewage treatment plant shown in FIG. 10 together with a treatment system; FIG.

FIG. 12 is a block diagram showing the structure of a conventional aeration airflow control device using the measuring instrument of FIG. 10. FIG.

FIG. 13 is a system diagram showing an arrangement of a measuring instrument of another conventional aeration airflow control device applied to the sewage treatment plant shown in FIG. 10 together with a treatment system;

FIG. 14 is a block diagram showing the structure of another conventional aeration air volume control device using the measuring instrument of FIG. 13; FIG.

[Description of Main Code in Drawing]

One… 1 inlet pump, 2... First settling basin, 3... Inlet flow meter, 4... Inlet total nitrogen system, 9... 1 aerator, 10.. 1 anaerobic tank, 11... Anoxic tank 1, 12. Unit 1 Unit 13,... 1 final sedimentation basin, 14... 1 circulation pump, 15... No. 1 conveying pump, 17... 1 surplus pump, 18... No. 1 second hand drawing pump, 25... No. 1 dissolved oxygen meter, 125... No. 2 dissolved oxygen concentration meter, 225... No. 3 dissolved oxygen concentration meter, 26... Ammonia-based, 101. No. 2 inlet pump, 201... No. 3 inlet pump, 109... No. 2 aerator, 209... 3 aerators, 40... No. 1 ammonia controller, 130... No. 2 DO controller, 230... No. 3 DO controller, 43... No. 1 diffuser efficiency input unit, 143... No. 2 diffuser efficiency input unit, 243... No. 3 diffuser efficiency input unit, 144... 1 to 2 diffuser efficiency ratio calculation unit, 244. 1 to 3 diffuser efficiency ratio calculation unit, 246. No. 1 air magnification calculating unit, 145... No. 2 aeration air volume calculating unit, 245... No. 3 aeration air volume calculating section, 47... 1 DO limiter unit, 147... No. 2 DO limiter unit, 247... No. 3 DO limiter device.

Claims (9)

In the aeration air volume control device of a sewage treatment plant, each containing an aeration tank having an aeration device operating according to the aeration air volume target value, and having a plurality of series of sewage treatment processes of the same treatment method, Flow rate control means for controlling the flow rate of sewage flowing into all of the plurality of series to be the same; An ammonia system for measuring the ammonia nitrogen concentration of the aerobic tank in any one of the plurality of series; A dissolved oxygen concentration meter for measuring the dissolved oxygen concentration of the aerobic tank in all of the plurality of series; First target value setting means for setting ammonia nitrogen concentration target value of the treated water in the sewage treatment plant; A target for setting the dissolved oxygen concentration target value of the aerobic tank of the series not provided with the ammonia system based on the dissolved oxygen concentration measurement value of the aerobic tank of the aerobic tank of the series in which the ammonia system in the plurality of series is provided; 2 target value setting means, The aeration apparatus of the aerobic tank in which the ammonia system is installed calculates a first aeration air volume target value for bringing the measured ammonia nitrogen concentration to ammonia nitrogen concentration target value, and the aerobic aeration apparatus in which the ammonia system is not provided. A controller for calculating second to n-th aeration air volume target values, each of which measures a measured oxygen concentration value close to the dissolved oxygen concentration target value, And an aeration air volume control device of the sewage treatment plant, based on the aeration air volume target value calculated by the controller. The method of claim 1, An inflow flow meter for measuring the inflow of the sewage, A total nitrogen system for measuring the total nitrogen concentration of the sewage, And the first aeration air volume target value is calculated using both or both of the measured inflow and total nitrogen concentration of the sewage, respectively, and the aeration air volume control device of the sewage treatment plant. The method of claim 1, Dissolved oxygen concentration meter which measures the dissolved oxygen concentration of all the said multiple series, respectively, A limiter device for setting an upper and lower limit of the dissolved oxygen concentration and controlling the amount of aeration air so that the dissolved oxygen concentration in each of the measured series is not deviated from the upper and lower limits; Aeration air volume control device of the sewage treatment plant characterized in that it comprises a.  In the aeration air volume control device of a sewage treatment plant, each containing an aeration tank having an aeration device operating according to the aeration air volume target value, and having a plurality of series of sewage treatment processes of the same treatment method, Flow rate control means for controlling the flow rate of sewage flowing into all of the plurality of series to be the same; An ammonia system for measuring the ammonia nitrogen concentration in the aerobic tank of any one of the plurality of series; Target value setting means for setting ammonia nitrogen concentration target value of the treated water in the sewage treatment plant; Diffuser efficiency input means for inputting diffuser efficiency of the aeration device for each series in the plurality of sequences; An aerator efficiency ratio calculation means for obtaining an aerator efficiency ratio of each of the aerobic aeration apparatuses of the another series to the aerobic aeration apparatus of the series in which the ammonia system of the plurality of series is provided, based on the inputted aerobic efficiency, respectively; , A controller configured to calculate an aeration air volume target value for attaching a measurement value of ammonia nitrogen concentration to an ammonia nitrogen concentration target value, which is attached to the aeration apparatus of the aerobic tank provided with the ammonia system; Aeration air volume calculating means for calculating an aeration air volume target value of the aeration apparatus in the aerobic tank in which the ammonia system is not provided by multiplying the aeration air volume target value calculated by the controller by the aerobic efficiency ratio between series series in the plurality of series; And controlling the aeration device based on the aeration air volume target value calculated by the aeration air flow rate calculation unit. The method of claim 4, wherein An inflow flowmeter for measuring the inflow of sewage flowing into the sewage treatment plant; A total nitrogen system for measuring the total nitrogen concentration of the sewage, And the first aeration air flow target value is calculated using at least one piece of information of the inflow amount of the sewage and the total nitrogen concentration, respectively, characterized in that the aeration air flow control device of the sewage treatment plant. The method of claim 4, wherein Dissolved oxygen concentration meter which measures the dissolved oxygen concentration of all the said multiple series, A limiter device for setting an upper and lower limit of the dissolved oxygen concentration and controlling the amount of aeration air so that the dissolved oxygen concentration measured from the plurality of series does not deviate from the upper and lower limits; Aeration air volume control device of the sewage treatment plant characterized in that it comprises a. In the aeration air volume control device of a sewage treatment plant, each containing an aeration tank having an aeration device operating according to the aeration air volume target value, and having a plurality of series of sewage treatment processes of the same treatment method, An inflow flow meter for measuring the flow rate of sewage flowing into each of the plurality of series; An ammonia system for measuring the ammonia nitrogen concentration in any one of said plurality of series of said aerobic tanks; Target value setting means for setting ammonia nitrogen concentration target value of the treated water in the sewage treatment plant; Diffuser efficiency input means for inputting diffuser efficiency of the aeration apparatus for each series of the plurality of series; An aerator efficiency ratio calculating means for obtaining an aerator efficiency ratio of each of the aerobic aeration apparatuses of the another series to the aerobic aeration apparatus of one series on which the ammonia system is installed, based on the inputted aerobic efficiency, respectively; A controller for calculating an aeration air volume target value for bringing the ammonia-based aeration apparatus provided with the ammonia system into a measurement value of ammonia nitrogen concentration close to the ammonia nitrogen concentration target value; Air magnification calculating means for calculating an air magnification of the series from the flow rate of sewage flowing into the series including the aerobic tank provided with the ammonia system and the aeration air volume of the aeration apparatus; The ammonia meter is installed on the basis of the aeration air volume target value calculated by the controller, multiplied by the air magnification, the aeration air volume target value obtained by the multiplication, the value obtained by multiplying the input acid efficiency by the acid efficiency ratio, and the measured flow rate of the inflowing sewage. Aeration air volume calculation means for calculating an aeration air volume target value of the aeration apparatus of the aerobic tank which is not present; And controlling the aeration device based on the aeration air volume target value calculated by the aeration air flow rate calculation unit. The method of claim 7, wherein An inflow flow meter for measuring the inflow amount of sewage flowing into the sewage treatment plant; A total nitrogen system for measuring the total nitrogen concentration of the sewage, And the first aeration air flow target value is calculated using at least one piece of information of the inflow amount and the total nitrogen concentration measured, respectively. The method of claim 7, wherein A dissolved oxygen concentration meter for measuring the dissolved oxygen concentration of each of the plurality of series; A limiter device that sets an upper and lower limit of the dissolved oxygen concentration and controls the amount of aeration air so that the dissolved oxygen concentration measured from each of the plurality of series does not deviate from the upper and lower limits;  Aeration air volume control device of the sewage treatment plant characterized in that it comprises a.