JPH11244889A - Biological phosphorous removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure good water quality by providing a biological reaction vessel, into which sewage flow and which is constituted of an anaerobic vessel and an aerobic vessel, and controlling the quantity of aeration in the aerobic vessel corresponding to the difference between the detected value and the target value of phosphorus concentration in the anaerobic vessel to constantly and excellently removed a phosphorus component in sludge. SOLUTION: The sewage is introduced into the anaerobic vessel in the biological reaction vessel through a pipe line (a). In the anaerobic vessel 1, phosphorus is discharged from phosphorus-accumulating microorganisms and in the aerobic vessel 2, phosphorus is excessively taken in the microorganisms, Next, a mixed solution containing the microorganisms, in which phosphorus is taken, is sent to a precipitating pond 4, where the microorganisms are precipitated and the supernatant water is discharged from a pipe line (c). A part of the microorganisms is taken out of the system through the pipe line (e) and the other microorganisms are returned to the anaerobic vessel through a pipe line (f). In such a case, a phosphoric acid based phosphorus concentration meter 7 is provided to detect the quantity of phosphorus to be discharged from the phosphorus-accumulating microorganisms and the output of the aeration device 3 is controlled corresponding to the deviation between the measured value and the target value setted in a setting instrument 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control apparatus for a biological phosphorus removing apparatus for removing phosphorus in water to be treated by the biological action of phosphorus accumulating bacteria.

[0002]

2. Description of the Related Art When phosphorus contained in sewage continues to flow into lakes and marshes and strongly closed bays, the concentration eventually becomes excessive,
Harmful phytoplankton such as blue-green algae and red tide are generated. This is called the eutrophication phenomenon and has become a serious social problem in recent years. As described in "Water Treatment Engineering (edited by Tetsuo Ide, Technical Hall)", there is an activated sludge method as a general method for treating municipal sewage and organic wastewater.
Activated sludge method is a group of microorganisms that have a purification function (activated sludge).
Is stored in a biological reactor, and aerated while sufficiently mixing and contacting the wastewater with the sewage to oxidatively decompose organic substances, which are the main polluting components in the sewage. The mixed solution after the aeration treatment is separated into supernatant water and activated sludge in the sedimentation basin, the supernatant water is discharged out of the system, and the concentrated activated sludge is returned to the biological reaction tank again.

The activated sludge method is a treatment method whose main purpose is to oxidatively decompose organic substances, and phosphorus cannot be sufficiently removed as it is. Therefore, a modified activated sludge method utilizing the function of certain microorganisms has been developed (Advanced Treatment Facility Design Manual (draft), Japan Sewer Association, 1994).

For example, there is a biological phosphorus removal method called an anaerobic aerobic activated sludge method. When a certain group of microorganisms is put in a state free of oxidizing substances such as oxygen and nitrate nitrogen, so-called anaerobic state, phosphoric acid phosphorus is discharged from the body into a liquid phase. When this state is continued for a certain period of time and then put in a state of oxygen, that is, a so-called aerobic state, on the contrary, more phosphoric acid phosphorus released into the liquid phase is taken into the body. As a result, the concentration of phosphoric acid in the liquid phase can be reduced below the initial concentration and finally reduced to a concentration close to zero. Microorganisms having such an excessive phosphorus intake function are collectively referred to as "phosphorus accumulating bacteria", and a modified activated sludge method utilizing this is called an anaerobic aerobic activated sludge method. It is generally known that the larger the amount of phosphorus discharged in an anaerobic state, the larger the intake amount in an aerobic state.

FIG. 14 is a block diagram showing a conventional example of a biological phosphorus removing apparatus using an anaerobic aerobic activated sludge method. In the figure, a is a pipe through which sewage flows, and is connected to a biological reaction tank. The biological reaction tank is divided into two parts, 41 is an anaerobic tank for discharging phosphorus from the phosphorus accumulating bacteria, and 42 is an aerobic tank for letting the phosphorus accumulating bacteria ingest phosphorus. 43 is an aerator for supplying air to the aerobic tank 42.

Reference numeral 44 denotes a sedimentation basin for precipitating a mixed solution containing microorganisms, and is connected to the aerobic tank 42 via a pipe b. c is a pipe for discharging the supernatant water after the sedimentation treatment, and is connected to the sedimentation tank 44. Reference numeral 45 denotes a pump for discharging surplus microorganisms out of the system.
Is connected to the sedimentation basin 44. The pipe e is a pipe connected to the pump 45. Reference numeral 46 denotes a pump for returning the microorganisms to the biological reaction tank. The pump 46 is connected to the sedimentation tank 44 via a pipe d and to the anaerobic tank 41 via a pipe f.

Next, the operation will be described. Sewage is pipe a
Is introduced into the biological reactor via In the anaerobic tank 41, phosphorus is discharged from the phosphorus accumulating bacteria, and in the aerobic tank 42, phosphorus is excessively taken into the phosphorus accumulating bacteria. The mixture containing the microorganisms that have taken in phosphorus is sent to the sedimentation basin 44 via the pipe b. In the sedimentation basin 44, after separating and separating the microorganisms, the supernatant water is discharged through the pipe c. Some of the microorganisms are pump 45,
It is pulled out of the system via the pipe e. Other microorganisms are returned to the anaerobic tank 41 via the pump 46 and the pipe f.

[0008]

Since the conventional biological phosphorus removing apparatus is configured as described above, the operation manager refers to the dissolved oxygen concentration in the biological reaction tank and transfers the biological phosphorus to the biological reaction tank. The amount of aeration, the amount of living organisms in the biological reactor, and the amount of sludge returned to the biological reactor were adjusted. However, general sewage, mainly domestic sewage, has remarkable fluctuations in flow rate and properties.According to these fluctuations, the aerobic state of the aerobic tank and the anaerobic state of the anaerobic tank are appropriately balanced, and always good water quality is maintained. There was a problem that it was difficult to secure

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes an aeration amount of a biological phosphorus removing device to a biological reaction tank, a biological amount of the biological reaction tank, and a return to the biological reaction tank. It is an object of the present invention to obtain a control device of a biological phosphorus removing device capable of always properly removing a phosphorus component in a pollutant and ensuring good water quality by appropriately controlling sludge amount and the like. .

[0010]

A biological phosphorus removing device according to a first aspect of the present invention comprises: a biological reaction tank including an anaerobic tank and an aerobic tank into which sewage flows, and an aerobic tank. A biological phosphorus removal device having an attached aeration device, wherein a means for measuring a phosphorus concentration in an anaerobic tank, a means for setting a target value of the phosphorus concentration, and a method for determining a difference between the phosphorus concentration and the target value. Means for adjusting the aeration amount accordingly.

According to a second aspect of the present invention, there is provided a biological phosphorus removing apparatus, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank while receiving sewage; and an aeration apparatus attached to the aerobic tank. A means for measuring an oxidation-reduction potential in an anaerobic tank, a means for setting a target value of the oxidation-reduction potential, and aeration according to a difference between the oxidation-reduction potential and the target value. Means for adjusting the amount.

According to a third aspect of the present invention, there is provided a biological phosphorus removing device, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank while sewage flows therein; and an aeration apparatus attached to the aerobic tank. A biological phosphorus removing device having means for measuring the phosphorus content of phosphorus accumulating bacteria in an anaerobic tank, means for setting a target value of the phosphorus content, and a difference between the phosphorus content and the target value. Means for adjusting the amount of aeration according to the conditions.

According to a fourth aspect of the present invention, there is provided a biological phosphorus removing apparatus, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank while sewage flows therein; and an aeration apparatus attached to the aerobic tank. A biological phosphorus removing device having a means for determining a difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the inflow sewage, a means for setting a target value of the difference, and a phosphorus concentration in the anaerobic tank. Means for adjusting the amount of aeration in accordance with the difference between the concentration of phosphorus in the incoming sewage and the target value is provided.

According to a fifth aspect of the present invention, there is provided a biological phosphorus removing apparatus, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank, into which sewage flows, and a mixed solution flowing out of the biological reaction tank. A sedimentation basin for sedimentation treatment, a biological phosphorus removal device having means for returning the settled sludge to the biological reaction tank, and means for measuring the phosphorus concentration in the anaerobic tank,
Means for setting a target value of the phosphorus concentration and means for adjusting the amount of returned sludge according to the difference between the phosphorus concentration and the target value are provided.

According to a sixth aspect of the present invention, there is provided a biological phosphorus removing apparatus, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank, into which sewage flows, and a mixed solution flowing out of the biological reaction tank. A biological phosphorus removing device having a sedimentation tank for performing a sedimentation treatment and a means for extracting precipitated excess sludge, wherein a means for measuring the phosphorus concentration in an anaerobic tank and a target value of the phosphorus concentration are set. And means for adjusting the amount of excess sludge withdrawn according to the difference between the phosphorus concentration and the target value.

According to a seventh aspect of the present invention, there is provided a biological phosphorus removing apparatus, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank while sewage flows therein; and an aeration apparatus attached to the aerobic tank. A means for determining the difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the aerobic tank, a means for setting a target value for the difference, and a phosphorus concentration in the anaerobic tank. Means for adjusting the amount of aeration in accordance with the difference between the target value and the difference between the concentration of phosphorus and the concentration of phosphorus in the incoming sewage.

The biological phosphorus removal apparatus according to claim 8 of the present invention is a biological reaction tank comprising an anaerobic tank and an aerobic tank while sewage flows therein, and an aeration apparatus attached to the aerobic tank. A means for measuring the amount of phosphorus flowing out or inflowing from the biological phosphorus removing apparatus; a means for setting a target value of the amount of phosphorus flowing out; and Means for measuring the oxidation-reduction potential in the tank,
Means for adjusting the amount of aeration in accordance with the difference between the outflow or inflow phosphorus amount and the target value and the oxidation-reduction potential is provided.

According to a ninth aspect of the present invention, there is provided a biological phosphorus removing device, comprising: a biological reaction tank including an anaerobic tank and an aerobic tank while sewage flows therein; and an aeration apparatus attached to the aerobic tank. A means for measuring the amount of phosphorus flowing out or inflowing from the biological phosphorus removing apparatus, and a means for setting a target value of the amount of phosphorus flowing out. Means for measuring the oxidation-reduction potential in the air tank;
Means for adjusting the amount of aeration in accordance with the difference between the outflow or inflow phosphorus amount and the target value and the oxidation-reduction potential is provided.

A biological phosphorus removing apparatus according to a tenth aspect of the present invention is provided with a corrector for correcting the output of the adjusting means according to a change tendency of the amount of effluent water or the amount of inflow water.

A biological phosphorus removing apparatus according to an eleventh aspect of the present invention is provided with a means for estimating a measured value at an arbitrary time using a measured value obtained by the measuring means.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a control device of the biological phosphorus removing device according to the first embodiment. In the drawing, a is a pipe for flowing sewage, which is connected to a biological reaction tank. 2 biological reactors
1 is an anaerobic tank for discharging phosphorus from phosphorus accumulating bacteria, and 2 is an aerobic tank for letting phosphorus accumulating bacteria ingest phosphorus. Reference numeral 3 denotes an aerator for supplying air to the aerobic tank 2.

Reference numeral 4 denotes a sedimentation basin for precipitating a mixed solution containing microorganisms, which is connected to the aerobic tank 2 via a pipe b. Reference numeral c denotes a pipe for discharging the supernatant water after the settling treatment, and is connected to the settling basin 4. Reference numeral 5 denotes a pump for discharging surplus microorganisms out of the system, and is connected to the sedimentation basin 4 via a pipe d. The pipe e is a pipe connected to the pump 5. Reference numeral 6 denotes a pump for returning microorganisms to the biological reaction tank, which is connected to the sedimentation tank 4 via a pipe d and to the anaerobic tank 1 via a pipe f.

Next, the operation will be described. Sewage is pipe a
Is introduced into the biological reactor via In the anaerobic tank 1, phosphorus is discharged from the phosphorus accumulating bacteria, and in the aerobic tank 2, phosphorus is excessively taken into the phosphorus accumulating bacteria. The mixture containing the microorganisms that have taken in phosphorus is sent to the sedimentation basin 4 via the pipe b. Settling basin 4
Then, after sedimentation and separation of the microorganisms, the supernatant water is discharged through the pipe c. Some of the microorganisms are drawn out of the system via the pump 5 and the pipe e. Other microorganisms are returned to the anaerobic tank 1 via the pump 6 and the pipe f.

In this embodiment, a phosphoric acid phosphorus concentration meter for measuring the concentration of phosphoric acid in the anaerobic tank 1 is provided as means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria. The apparatus is configured to adjust the aeration amount as an operation set value. Reference numeral 7 denotes a phosphoric acid phosphorus concentration meter for measuring the concentration of phosphoric acid in the anaerobic tank 1, and reference numeral 8 denotes a setting device for setting a target value of the phosphoric acid concentration.

Reference numeral 9 denotes a controller for adjusting the output of the aeration apparatus 3 in accordance with the deviation between the measured value of the phosphoric acid phosphorus concentration meter 7 and the target value of the phosphoric acid phosphorus concentration set in the setting device 8. Phosphoric acid concentration meter 7 via line 7a and signal line 8a
The setting device 8 is connected to the aerator 3 via a signal line 9a. In the present embodiment, the position of the phosphoric acid phosphorus concentration meter 7 is not limited at all, and the phosphoric acid phosphorus concentration meter 7 may be installed in another place and water may be collected from the anaerobic tank 1. .

Next, the operation will be described. The phosphoric acid phosphorus concentration in the anaerobic tank 1 is measured by a phosphoric acid phosphorus concentration meter 7, and the measured value is transmitted to a controller 9 via a signal line 7a. Further, the target value of the phosphoric acid phosphorus concentration set in the setting unit 8 is transmitted to the controller 9 via the signal line 8a. In the controller 9, the aeration amount is calculated, for example, according to the formula (1. 1) according to the deviation between the measured value of the phosphoric acid phosphorus concentration and a predetermined target value.
Output according to 1).

Qair = Qair0 + Kair1 (CPO4ana-CPO4ana *) (1.1) where, Qair: aeration amount Qair0: constant Kair1: constant (> 0) CPO4ana *: target of phosphoric acid phosphorus concentration in anaerobic tank 1 Value CPO4ana: Measured value of phosphoric acid phosphorus concentration in anaerobic tank 1 The output of controller 9 is transmitted to aeration device 3 via signal line 9a.

Thus, the measured value C of the phosphoric acid phosphorus concentration is obtained.
If PO4ana is smaller than the target value CPO4ana *, the aeration amount Qair decreases, and the anaerobic degree of the anaerobic tank 1 increases. That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria increases. Conversely, if the measured value CPO4ana of the phosphoric acid phosphorus concentration is larger than the target value CPO4ana *, the aeration amount Qa
Ir increases, and the anaerobic degree of the anaerobic tank 1 decreases. That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria decreases. By the above operation, the amount of phosphorus discharged from the phosphorus accumulating bacteria in the anaerobic tank 1 is kept constant, so that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

Embodiment 2 FIG. 2 is a configuration diagram illustrating a control device of the biological phosphorus removing device according to the second embodiment,
In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the present embodiment, an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the anaerobic tank 1 is provided as a means for detecting the amount of phosphorus discharged from the phosphorus-accumulating bacteria, and aeration is set as the operation set value of the biological phosphorus removal device. The device is configured to adjust the volume.

Reference numeral 10 denotes an oxidation-reduction potential meter for measuring the oxidation-reduction potential of the anaerobic tank 1, and reference numeral 11 denotes a setting device for setting a target value of the oxidation-reduction potential. Reference numeral 19 denotes an adjuster for adjusting the output of the aeration apparatus 3 in accordance with the deviation between the measurement value of the oxidation-reduction potentiometer 10 and the target value of the oxidation-reduction potential set in the setting device 11, and oxidized via the signal line 10a. The reduction potentiometer 10, the setting device 11 via a signal line 11a, and the aeration apparatus 3 via a signal line 9a. In the present embodiment, the position of the oxidation-reduction potentiometer 10 is not limited at all, and the oxidation-reduction potentiometer 10 is installed in another place,
Water may be collected from the anaerobic tank 1.

Next, the operation will be described. The oxidation-reduction potential in the anaerobic tank 1 is measured by an oxidation-reduction potentiometer 10, and the measured value is transmitted to a controller 9 via a signal line 10a. The target value of the oxidation-reduction potential set in the setting device 11 is as follows:
The signal is transmitted to the controller 9 via the signal line 11a. Controller 9
Then, the aeration amount is output in accordance with, for example, equation (2.1) according to the deviation between the measured value of the oxidation-reduction potential and a predetermined target value.

Qair = Qair0 + Kair2 (Vana-Vana *) (2.1) where, Qair: aeration amount Qair0: constant Kair2: constant (<0) Vana *: target value of oxidation-reduction potential of anaerobic tank 1 Vana : Measured value of oxidation-reduction potential of anaerobic tank 1 The output of controller 9 is transmitted to aeration device 3 via signal line 9a.

Thus, the measured value of the oxidation-reduction potential Van
If a is larger than the target value Vana *, the aeration amount Qai
r decreases, and the anaerobic degree of the anaerobic tank 1 increases. That is,
The amount of phosphorus discharged from phosphorus accumulating bacteria increases. Conversely, if the measured value Vana of the oxidation-reduction potential is smaller than the target value Vana *, the aeration amount Qair increases, and the anaerobic degree of the anaerobic tank 1 decreases. That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria decreases. By the above operation, the amount of phosphorus discharged from the phosphorus accumulating bacteria in the anaerobic tank 1 is kept constant, so that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

Embodiment 3 FIG. 3 is a configuration diagram showing a control device of the biological phosphorus removing device according to the third embodiment. In the drawing, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts. In the present embodiment, a means for measuring the phosphorus content of the phosphorus accumulating bacteria in the anaerobic tank 1 is provided as means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria, and the operation setting of the biological phosphorus removing device is provided. The apparatus is configured to adjust the aeration amount as a value.

Reference numeral 12 denotes a measuring instrument for measuring the phosphorus content of the phosphorus accumulating bacteria in the anaerobic tank 1, and reference numeral 13 denotes a setting device for setting a target value of the phosphorus content. Reference numeral 9 denotes an adjuster for adjusting the output of the aeration apparatus 3 in accordance with the deviation between the measured value of the phosphorus content measuring device 12 and the target value of the phosphorus content set in the setting device 13, via a signal line 12a. The phosphorus content measuring device 12, the setting device 13 via a signal line 13a, and the aeration apparatus 3 via a signal line 9a. In the present embodiment, the position of the phosphorus content measuring device 12 is not limited at all, and the phosphorus content measuring device 12 may be installed in another place and water may be collected from the anaerobic tank 1. .

Next, the operation will be described. The phosphorus content of the phosphorus accumulating bacteria in the anaerobic tank 1 is measured by a phosphorus content measuring device 12, and the measured value is transmitted to a controller 9 via a signal line 12a. Further, the target value of the phosphorus content set in the setter 13 is transmitted to the controller 9 via a signal line 13a. In the controller 9, the aeration amount is calculated, for example, according to the formula (3.3.) According to the deviation between the measured value of the phosphorus content and a predetermined target value.
Output according to 1).

Qair = Qair0 + Kair3 (Pacmana-Pacmana *) (3.1) where, Qair: aeration amount Qair0: constant Kair3: constant (<0) Pacmana *: phosphorus content of phosphorus accumulating bacteria in anaerobic tank 1 Target value of amount Pacmana: measured value of phosphorus content of phosphorus accumulating bacteria in anaerobic tank 1 The output of controller 9 is transmitted to aeration device 3 via signal line 9a.

Thus, the measured value of the phosphorus content Pacm
If ana is larger than the target value Pacmana *, the aeration amount Qair decreases, and the anaerobic degree of the anaerobic tank 1 increases.
That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria increases. Conversely, the measured value Pacmana of the phosphorus content is the target value Pacma.
If it is smaller than ana *, the aeration amount Qair increases,
The anaerobic degree of the anaerobic tank 1 decreases. That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria decreases. By the above operation, the amount of phosphorus discharged from the phosphorus accumulating bacteria in the anaerobic tank 1 is kept constant, so that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

Embodiment 4 FIG. 4 is a configuration diagram showing a control device of the biological phosphorus removing device according to the fourth embodiment. In the drawing, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts. In this embodiment, a device for detecting the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the incoming sewage is provided as means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria. The apparatus is configured to adjust the amount of aeration as an operation set value of the chemical phosphorus removal apparatus.

14 is the concentration of phosphoric acid phosphorus in the inflow sewage,
Reference numeral 15 denotes a phosphorus concentration meter that measures the concentration of phosphoric acid in the anaerobic tank 1. Numeral 16 denotes a calculator for calculating the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the inflowing sewage, and connects the phosphoric acid concentration meter 14 and the signal line 15a via a signal line 14a. It is connected to the phosphoric acid phosphorus concentration meter 15 through the above.

Reference numeral 17 denotes a setting device for setting a target value of the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the incoming sewage. This is a controller for adjusting the output of the aeration apparatus 3 in accordance with the difference between the concentration of the phosphoric acid phosphorus in the sewage and the target value set in the setter 17, and the arithmetic unit 16 through a signal line 16a.
And the setting device 17 via a signal line 17a, and the aeration apparatus 3 via a signal line 9a. In this embodiment, the positions of the phosphoric acid phosphorus concentration meters 14 and 15 are not limited at all, as in the other embodiments.

Next, the operation will be described. The concentration of phosphoric acid in the incoming sewage is measured by a phosphoric acid concentration meter 14, and the measured value is transmitted to a computing unit 16 via a signal line 14a. The phosphoric acid phosphorus concentration in the anaerobic tank 1 is measured by a phosphoric acid phosphorus concentration meter 15, and the measured value is represented by a signal line 15a.
To the computing unit 16 via The computing unit 16 computes the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the incoming sewage according to, for example, equation (4.1).

DPO4anain = CPO4ana−CPO4in (4.1) where DPO4anain: Difference between the phosphoric acid phosphorus concentration of the anaerobic tank 1 and the phosphoric acid phosphorus concentration of the inflow sewage CPO4ana: the phosphoric acid phosphorus concentration of the anaerobic tank 1 CPO4in: Inflow sewage The output of the arithmetic unit 16 is transmitted to the controller 9 via a signal line 16a. The target value of the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the incoming sewage set in the setting device 17 is transmitted to the controller 9 via a signal line 17a. The controller 9 calculates the aeration amount according to, for example, an equation (Eq. (3)) according to a deviation between a measured value of a difference between the phosphoric acid phosphorus concentration in the anaerobic tank 1 and the phosphoric acid phosphorus concentration in the inflowing sewage and a predetermined target value. Output according to 4.2).

Qair = Qair0 + Kair4 (DPO4anain-DPO4anain *) (4.1) where, Qair: aeration amount Qair0: constant Kair4: constant (> 0) DPO4anain *: Phosphorus in the anaerobic tank 1 The output of the controller 9 is transmitted to the aeration device 3 via a signal line 9a. Thus, in addition to the effect of the first embodiment, even when the concentration of phosphorous phosphorus in the inflowing sewage rises or falls, the substantial amount of discharged phosphorus can be accurately detected, so that the amount of phosphorus flowing out of the biological phosphorus removing device can be detected. This has the effect that the amount can be more reliably reduced.

Embodiment 5 FIG. FIG. 5 is a configuration diagram showing a control device of the biological phosphorus removing device according to the fifth embodiment,
In the drawings, the same reference numerals as those in FIGS. 1 to 4 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured to estimate the phosphoric acid phosphorus concentration in the anaerobic tank 1 in consideration of the time required for analyzing the phosphorus concentration.

Reference numeral 18 denotes a storage circuit for storing the data of the phosphoric acid phosphorus concentration in the anaerobic tank 11, which is connected to the phosphoric acid phosphorus concentration meter 7 via a signal line 7a. Numeral 19 denotes an arithmetic unit for estimating the phosphoric acid phosphorus concentration of the anaerobic tank 1 using the data of the phosphoric acid phosphorus concentration accumulated in the storage circuit 18, and the storage circuit 18 and the signal line 19a via the signal line 18a. Is connected to the controller 9 via the.

Next, the operation will be described. The phosphoric acid phosphorus concentration in the anaerobic tank 1 is measured by a phosphoric acid phosphorus concentration meter 7, and the measured value is transmitted to a storage circuit 18 via a signal line 7a. The arithmetic unit 19 estimates the phosphoric phosphorus concentration CPO4anaest of the anaerobic tank 1 at an arbitrary time using the phosphoric phosphorus concentration data stored in the storage circuit 18. This can be easily performed using a statistical analysis method such as the least square method.

Data on the concentration of phosphoric acid required for the analysis is transmitted from the storage circuit 18 via the signal line 18a. The estimated value CPO4anaest is transmitted to the controller 9 via the signal line 19a. Hereinafter, the operation is performed in the same manner as in the first embodiment. Thus, in addition to the effects of the first embodiment, even when analysis of the phosphorus concentration requires time, it is possible to estimate the phosphoric acid phosphorus concentration of the anaerobic tank 1 in consideration of the fluctuation during the analysis, and to remove the biological phosphorus. This has the effect of reliably reducing the amount of phosphorus flowing out of the system.

In this embodiment, a storage circuit is added so that the phosphoric acid phosphorus concentration in the anaerobic tank 1 can be estimated in consideration of the time required for phosphorus analysis. The apparatus may be configured to add a storage circuit to the second to fourth embodiments so that each value can be estimated in consideration of the time required for analysis.

Embodiment 6 FIG. FIG. 6 is a configuration diagram showing a control device of the biological phosphorus removing device according to the sixth embodiment. In the drawing, the same reference numerals as those in FIGS. 1 to 5 indicate the same or corresponding parts. In the present embodiment, a means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria is provided with a phosphoric acid phosphorus concentration meter for measuring the concentration of phosphoric acid in the anaerobic tank 1, and the operation set value of the biological phosphorus removing device is provided. The apparatus is configured to adjust the amount of returned sludge.

Reference numeral 9 denotes a controller for adjusting the output of the return sludge pump 6 according to the deviation between the measured value of the phosphoric acid phosphorus concentration meter 7 and the target value of the phosphoric acid phosphorus concentration set in the setting device 8. It is connected to a phosphoric acid phosphorus concentration meter 7 via a line 7a, a setting device 8 via a signal line 8a, and a return sludge pump 6 via a signal line 9b. In this embodiment, the position of the phosphoric acid phosphorus concentration meter 7 is not limited at all, as in the other embodiments.

Next, the operation will be described. The phosphoric acid phosphorus concentration in the anaerobic tank 1 is measured by a phosphoric acid phosphorus concentration meter 7, and the measured value is transmitted to a controller 9 via a signal line 7a. Further, the target value of the phosphoric acid phosphorus concentration set in the setting unit 8 is transmitted to the controller 9 via the signal line 8a. The controller 9 outputs the amount of returned sludge in accordance with, for example, equation (6.1) according to the deviation between the measured value of the phosphoric acid phosphorus concentration and a predetermined target value.

Qret = Qret0 + Kret6 (CPO4ana−CPO4ana *) (6.1) Where, Qret: Returned sludge amount Qret0: Constant Kret6: Constant (> 0) CPO4ana *: Phosphoric acid phosphorus concentration of anaerobic tank 1 Target value CPO4ana: Measured value of phosphoric acid phosphorus concentration in anaerobic tank 1 The output of controller 9 is transmitted to aeration device 3 via signal line 9b.

Thus, the measured value C of the phosphoric acid phosphorus concentration is obtained.
If PO4ana is smaller than target value CPO4ana *, the amount of returned sludge Qret decreases, and the anaerobic degree of anaerobic tank 1 increases. This is because the return amount of oxides such as nitrate nitrogen generated in the aerobic tank 2 is reduced. Anaerobic tank 1
As the anaerobic degree of P increases, the amount of phosphorus discharged from phosphorus accumulating bacteria increases.

Conversely, the measured value of the phosphoric acid phosphorus concentration CPO4
If ana is larger than the target value CPO4ana *, the return sludge amount Qret increases, and the anaerobic degree of the anaerobic tank 1 decreases. That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria decreases. By the above operation, the amount of phosphorus discharged from the phosphorus accumulating bacteria in the anaerobic tank 1 is kept constant, so that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

Embodiment 7 FIG. FIG. 7 is a configuration diagram showing a control device of the biological phosphorus removing device according to the seventh embodiment. In the drawing, the same reference numerals as those in FIGS. 1 to 6 indicate the same or corresponding parts. In the present embodiment, a means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria is provided with a phosphoric acid phosphorus concentration meter for measuring the concentration of phosphoric acid in the anaerobic tank 1, and the operation set value of the biological phosphorus removing device is provided. The apparatus is configured to adjust the amount of excess sludge drawn out.

Reference numeral 9 denotes a controller for adjusting the output of the excess sludge pump 5 in accordance with the deviation between the value measured by the phosphoric acid phosphorus concentration meter 7 and the target value of the phosphoric acid phosphorus concentration set in the setting device 8. The phosphoric acid phosphorus concentration meter 7 is connected via a line 7a, the setting device 8 via a signal line 8a, and the excess sludge pump 5 via a signal line 9c. In this embodiment, the position of the phosphoric acid phosphorus concentration meter 7 is not limited at all, as in the other embodiments.

Next, the operation will be described. The phosphoric acid phosphorus concentration in the anaerobic tank 1 is measured by a phosphoric acid phosphorus concentration meter 7, and the measured value is transmitted to a controller 9 via a signal line 7a. Further, the target value of the phosphoric acid phosphorus concentration set in the setting unit 8 is transmitted to the controller 9 via the signal line 8a. The controller 9 outputs a surplus sludge withdrawal amount according to, for example, equation (7.1) according to a deviation between the measured value of the phosphoric acid phosphorus concentration and a predetermined target value.

Qdrw = Qdrw0 + Kdrw7 (CPO4ana−CPO4ana *) (7.1) Where, Qdrw: excess sludge withdrawal amount Qdrw0: constant Kdrw7: constant (> 0) CPO4ana *: target value of phosphoric acid phosphorus in anaerobic tank 1 CPO4ana: Measured value of the concentration of phosphoric acid and phosphorus in the anaerobic tank 1 The output of the controller 9 is supplied via the signal line 9c to the excess sludge pump
Conveyed to.

Thus, the measured value C of the phosphoric acid phosphorus concentration is obtained.
If PO4ana is smaller than the target value CPO4ana *, the surplus sludge withdrawal amount Qdrw is reduced, and the biomass in the system is increased. That is, the total amount of phosphorus discharged from the phosphorus accumulating bacteria increases. Conversely, if the measured value CPO4ana of the phosphoric acid phosphorus concentration is larger than the target value CPO4ana *, the excess sludge withdrawal amount Qdrw increases, and the amount of organisms in the system decreases. That is, the total amount of phosphorus discharged from the phosphorus accumulating bacteria decreases. By the above operation, the anaerobic tank 1
Therefore, the amount of phosphorus discharged from the phosphorus accumulating bacteria is kept constant, so that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

Embodiment 8 FIG. In the sixth embodiment, as a means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria, a phosphoric acid phosphorus concentration meter 7 for measuring the concentration of phosphoric phosphorus in the anaerobic tank 1 is provided. The apparatus is configured to adjust the amount of returned sludge as a set value. However, as described in the second to fourth embodiments, other phosphorus discharge amount detecting means, for example, an oxidation reduction method for measuring an oxidation reduction potential of the anaerobic tank 1. Embodiment 6 Even if a configuration including an electrometer is provided, Embodiment 6
It has the same effect as. Further, similarly to the fifth embodiment,
A storage circuit can be added to the apparatus so that the phosphoric acid phosphorus concentration in the anaerobic tank 1 can be estimated in consideration of the time required for phosphorus analysis.

In the seventh embodiment, the phosphoric acid phosphorus concentration meter 7 for measuring the concentration of phosphoric phosphorus in the anaerobic tank 1 is provided as means for detecting the amount of phosphorus discharged from the phosphorus accumulating bacteria.
Further, the apparatus is configured so as to adjust the excess sludge withdrawal amount as an operation set value of the biological phosphorus removing apparatus. However, as described in Embodiments 2 to 4, other phosphorus discharge amount detecting means, for example, an anaerobic tank The same effect as that of the seventh embodiment can be obtained even if a configuration including an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of No. 1 is provided. Further, similarly to the fifth embodiment, the apparatus can be configured by adding a storage circuit so that the phosphoric acid phosphorus concentration of the anaerobic tank 1 can be estimated in consideration of the time required for phosphorus analysis.

Embodiment 9 FIG. FIG. 8 is a configuration diagram showing a control device of the biological phosphorus removing device according to the ninth embodiment. In the drawing, the same reference numerals as those in FIGS. 1 to 7 indicate the same or corresponding parts. In this embodiment, means for measuring the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the aerobic tank 2 is provided as means for detecting the amount of phosphorus taken up by the phosphorus accumulating bacteria. The apparatus is configured to adjust the amount of aeration as an operation set value of the target phosphorus removal apparatus.

Reference numeral 7 denotes the concentration of phosphoric acid in the anaerobic tank 1
Is a phosphoric acid phosphorus concentration meter for measuring the phosphoric acid phosphorus concentration in the aerobic tank 2. Numeral 21 denotes an arithmetic unit for calculating the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the aerobic tank 2, and a phosphoric acid concentration meter 7 via a signal line 7a.
Is connected to the phosphoric acid phosphorus concentration meter 20 via a signal line 20a.

Reference numeral 22 denotes a setting device for setting a target value of the difference in the phosphoric acid concentration, and reference numeral 23 denotes an output of the aeration device 3 in accordance with a deviation between the difference in the phosphoric acid phosphorus concentration and the target value set in the setting device 22. Is connected to the arithmetic unit 21 via a signal line 21a, the setting unit 22 via a signal line 22a, and the aeration apparatus 3 via a signal line 23a. In addition,
In the present embodiment, the positions of the phosphoric acid phosphorus concentration meters 7 and 20 are not limited at all, as in the other drawings.

Next, the operation will be described. The phosphoric acid phosphorus concentration in the anaerobic tank 1 is measured by a phosphoric acid phosphorus concentration meter 7, and the phosphoric acid phosphorus concentration in the aerobic tank 2 is measured by a phosphoric acid phosphorus concentration meter 20, and the measured values are signal line 7a and signal line 7, respectively. 20a
To the computing unit 21 via The arithmetic unit 21 calculates the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the aerobic tank 2 according to, for example, equation (9.1).

DPO4anaaer = CPO4ana−CPO4aer (9.1) where, DPO4anaaer: difference between the phosphoric acid phosphorus concentration of the anaerobic tank 1 and the phosphoric acid phosphorus concentration of the aerobic tank 2 CPO4ana: the phosphoric acid phosphorus concentration of the anaerobic tank 1 Measured value CPO4aer: Measured value of the concentration of phosphoric acid and phosphorus in the aerobic tank 2 The output of the calculator 21 is sent to the controller 23
Conveyed to.

The target value of the difference between the concentrations of the phosphoric acid and phosphorus set in the setting unit 22 is adjusted via the signal line 22a.
It is conveyed to 3. In the controller 23, according to the deviation between the measured value of the difference in the concentration of the phosphoric acid phosphorus and a predetermined target value,
The aeration amount is output, for example, according to equation (9.2). Qair = Qair0 + Kair9 (DPO4anaerer-DPO4anaerer *) (9.2) Where, Qair: aeration amount Qair0: constant Kair9: constant (> 0) DPO4anaerer *: Difference in phosphoric acid phosphorus concentration controller The output is transmitted to the aeration device 3 via the signal line 23a.

Thus, if the difference between the phosphoric acid and phosphorus concentrations is smaller than the target value, the aeration amount Qair decreases and the anaerobic degree of the anaerobic tank 1 increases. That is, an increase in the amount of phosphorus discharged from the phosphorus accumulating bacteria increases the amount of phosphorus intake. Conversely, if the difference between the phosphoric acid phosphorus concentrations is larger than the target value, the aeration amount Qair increases, and the anaerobic degree of the anaerobic tank 1 decreases. That is, the amount of phosphorus discharged from the phosphorus accumulating bacteria decreases. By the above operation, the amount of phosphorus taken up by the phosphorus accumulating bacteria is kept constant, so that there is an effect that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

In the above description, the apparatus is provided with means for measuring the difference between the concentration of phosphoric acid in the anaerobic tank 1 and the concentration of phosphoric acid in the aerobic tank 2 as means for detecting the amount of phosphorus taken up by the phosphorus accumulating bacteria. The second and third embodiments
As described above, the same effect can be obtained by providing another detecting means, for example, a means for measuring the difference between the oxidation-reduction potential of the anaerobic tank 1 and the oxidation-reduction potential of the aerobic tank 2. Further, similarly to the fifth embodiment, the apparatus may be configured by adding a storage circuit so that the phosphoric acid phosphorus concentration in the anaerobic tank 1 or the aerobic tank 2 can be estimated in consideration of the time required for phosphorus analysis. it can.

In the above description, the apparatus is configured to adjust the amount of aeration as the operation set value of the biological phosphorus removing apparatus. However, as described in the sixth and seventh embodiments, the other operation set values are set. For example, the same effect can be obtained even if the apparatus is configured to adjust the amount of returned sludge or the amount of excess sludge withdrawn. Further, similarly to the fifth embodiment, the apparatus may be configured by adding a storage circuit so that the phosphoric acid phosphorus concentration in the anaerobic tank 1 or the aerobic tank 2 can be estimated in consideration of the time required for phosphorus analysis. it can.

Embodiment 10 FIG. FIG. 9 shows Embodiment 10
1 is a block diagram showing a control device of a biological phosphorus removing device according to the present invention, and the same reference numerals in FIGS. 1 to 8 denote the same or corresponding parts. In the present embodiment, an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the anaerobic tank 1 is provided as means for detecting excess or deficiency of the amount of phosphorus discharged from the phosphorus accumulating bacteria, and the operation set value of the biological phosphorus removal device The apparatus is configured to adjust the amount of aeration.

Reference numeral 24 denotes a flow meter for measuring the flow rate of the treated water discharged from the biological phosphorus removing device, and reference numeral 25 denotes a total phosphorus concentration meter for measuring the total phosphorus concentration in the treated water. When the amount of phosphorus other than the phosphoric acid phosphorus contained in the treated water can be ignored, a phosphoric acid phosphorus concentration meter may be used instead of the total phosphorus concentration meter. Numeral 26 denotes an arithmetic unit for calculating the amount of phosphorus flowing out of the biological phosphorus removing device per unit time, and the flow meter 24 and the signal line 2 are connected via a signal line 24a.
It is connected to the total phosphorus concentration meter 25 via 5a.

Reference numeral 10 denotes an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the anaerobic tank 1, and 27 denotes a setting device for setting a target value of the amount of phosphorus flowing out. Reference numeral 28 denotes the amount of phosphorus discharged and the setting device 2
7 is an adjuster for adjusting the output of the aeration apparatus 3 in accordance with the deviation from the target value of the amount of phosphorus discharged out of the anaerobic tank 1 and the oxidation-reduction potential of the anaerobic tank 1. The oxidation-reduction potentiometer 10 and the signal line 27 are connected via the signal line 10a.
The setting device 27 is connected to the aerator 3 via a, and the aerator 3 is connected to the setting device 27 via a signal line 28a.

In this embodiment, the flow meter 24
The positional relationship of the total phosphorus concentration meter 25 is not limited at all, and there is no problem even if the total phosphorus concentration meter 25 is on the downstream side and the flow meter 24 is on the upstream side. In addition, total phosphorus concentration meter 25
May be installed in another place, and water may be collected from the aerobic tank 2, the pipe b, the sedimentation tank 4, or the pipe c, and the flow meter 24 may be installed in the pipe a. Further, the position of the oxidation-reduction potentiometer 10 is not limited to the anaerobic tank 1, but may be installed in another place to collect water from the anaerobic tank 1.

Next, the operation will be described. The flow rate of the treated water flowing out of the biological phosphorus removal device is measured by a flow meter 24.
The total phosphorus concentration in the treated water is measured by a total phosphorus concentration meter 25, and the respective measured values are represented by a signal line 24a and a signal line 25.
It is transmitted to the arithmetic unit 26 via a. In the arithmetic unit 26,
For example, the amount of phosphorus flowing out of the biological phosphorus removing device per unit time is calculated according to the equation (10.1).

Pout = Qout × CTPout (10.1) where, Pout: the amount of phosphorus flowing out of the biological phosphorus removal device per unit time. Qout: the flow rate of the treated water. CTPout: the total phosphorus concentration in the treated water. The output of the controller 26 is transmitted to a controller 28 via a signal line 26a. Further, the oxidation-reduction potential of the anaerobic tank 1 is measured by the oxidation-reduction potentiometer 10, and the measured value is transmitted to the controller 28 via the signal line 10a. The target value of the amount of phosphorus discharged from the setter 27 is transmitted to the controller 28 via a signal line 27a.

The controller 28 adjusts the amount of aeration according to the deviation between the measured value of the amount of phosphorus flowing out and a predetermined target value. The arithmetic expressions are, for example, Expressions (10.2) to (10.
The value is changed according to the oxidation-reduction potential of the anaerobic tank 1 as in 3). Qair = Qair0 + Kair101 (Pout-Pout *) (Vana <Vana *) (10.2) Qair = Qair0 + Kair102 (Pout-Pout *) (Vana ≧ Vana *) (10.3) Quantity Qair0: constant Kair101: constant (> 0) Kair102: constant (<0) Pout *: target value of the amount of phosphorus discharged The output of the controller 28 is transmitted to the aeration apparatus 3 via a signal line 28a.

That is, when the oxidation-reduction potential of the anaerobic tank 1 is lower than a predetermined reference value, sufficient phosphorus is discharged from the anaerobic tank 1, and the more the aeration amount in the aerobic tank 2, the more phosphorus is added. Is assumed to be consumed in a large amount, and the aeration amount is adjusted according to the equation (10.2). On the other hand, when the oxidation-reduction potential of the anaerobic tank 1 is higher than a predetermined reference value, the discharge of phosphorus in the anaerobic tank 1 is insufficient, and phosphorus must be squeezed in the aerobic tank 2 if the amount of aeration is not reduced. Assuming that ejection is not performed, the equation (10.
Adjust the amount of aeration according to 3). By the above operation,
Since the required amount of aeration can be provided without excess and deficiency, there is an effect that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

In the above description, the amount of phosphorus flowing out of the biological phosphorus removing device per unit time is determined from the product of the flow rate of the treated water discharged from the biological phosphorus removing device and the total phosphorus concentration in the treated water. Although the apparatus is configured to obtain the same, when the fluctuation of the flow rate of the treated water is small, the same effect can be obtained even if the flow meter is omitted and the apparatus is configured to be used for a necessary calculation as a predetermined value. .

In the above description, the apparatus is configured to include an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the anaerobic tank 1 as means for detecting the excess or deficiency of the amount of phosphorus discharged from the phosphorus-accumulating bacteria. Similar effects can be obtained by providing other phosphorus discharge amount detecting means shown in the first, third, and fourth embodiments, for example, a measuring device for measuring the phosphorus content of the phosphorus accumulating bacteria in the anaerobic tank 1. Further, similarly to the fifth embodiment, the apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for analyzing phosphorus.

Further, in the above description, the apparatus is configured so that the aeration amount is adjusted as the operation set value of the biological phosphorus removing apparatus. However, as described in the sixth and seventh embodiments, the other operation set values are set. For example, even if the apparatus is configured to adjust the amount of returned sludge or the amount of excess sludge withdrawn, the same effect as described above can be obtained. Also, in this case, similarly to Embodiment 5,
The apparatus can also be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for phosphorus analysis.

Embodiment 11 FIG. FIG. 10 shows Embodiment 1
FIG. 10 is a configuration diagram showing a control device of the biological phosphorus removing device according to No. 1 and in the figures, the same reference numerals as those in FIGS. In the present embodiment, an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the aerobic tank 2 is provided as means for detecting excess or deficiency of the phosphorus intake from the phosphorus accumulating bacteria, and the operation setting of the biological phosphorus removal device is provided. The apparatus is configured to adjust the aeration amount as a value.

Reference numeral 24 denotes a flow meter for measuring the flow rate of the treated water discharged from the biological phosphorus removing device, and reference numeral 25 denotes a total phosphorus concentration meter for measuring the total phosphorus concentration in the treated water. When the amount of phosphorus other than the phosphoric acid phosphorus contained in the treated water can be ignored, a phosphoric acid phosphorus concentration meter may be used instead of the total phosphorus concentration meter. Numeral 26 denotes an arithmetic unit for calculating the amount of phosphorus flowing out of the biological phosphorus removing device per unit time, and the flow meter 24 and the signal line 2 are connected via a signal line 24a.
It is connected to the total phosphorus concentration meter 25 via 5a.

Reference numeral 29 denotes an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the aerobic tank 2, and reference numeral 27 denotes a setting device for setting a target value of the amount of phosphorus flowing out. Reference numeral 28 denotes the amount of phosphorus discharged and the setting device 2
7 is a controller for adjusting the output of the aeration apparatus 3 in accordance with the deviation of the amount of phosphorus discharged from the target value set in 7 and the oxidation-reduction potential of the aerobic tank 2, and the arithmetic unit 26 through a signal line 26a. , A redox potentiometer 29 via a signal line 29a and a signal line 27
The setting device 27 is connected to the aerator 3 via a, and the aerator 3 is connected to the setting device 27 via a signal line 28a.

In this embodiment, the flow meter 24
The positional relationship of the total phosphorus concentration meter 25 is not limited at all, and there is no problem even if the total phosphorus concentration meter 25 is on the downstream side and the flow meter 24 is on the upstream side. In addition, total phosphorus concentration meter 25
May be installed in another place, and water may be collected from the aerobic tank 2, the pipe b, the sedimentation tank 4, or the pipe c.
May be installed in the pipe a. In addition, the oxidation-reduction potentiometer 29
The position is not limited to the aerobic tank 2 but may be installed in another location to collect water from the aerobic tank 2.

Next, the operation will be described. The flow rate of the treated water flowing out of the biological phosphorus removal device is measured by a flow meter 24.
The total phosphorus concentration in the treated water is measured by a total phosphorus concentration meter 25, and the respective measured values are represented by a signal line 24a and a signal line 25.
It is transmitted to the arithmetic unit 26 via a. In the arithmetic unit 26,
For example, according to the equation (10.1), the output of the calculator 26 for calculating the amount of phosphorus flowing out of the biological phosphorus removing device per unit time is transmitted to the controller 28 via a signal line 26a.

The oxidation-reduction potential of the aerobic tank 2 is measured by an oxidation-reduction potentiometer 29, and the measured value is transmitted to a controller 28 via a signal line 29a. The target value of the amount of phosphorus discharged from the setter 27 is transmitted to the controller 28 via a signal line 27a. The controller 28 adjusts the amount of aeration according to the deviation between the measured value of the amount of phosphorus flowing out and a predetermined target value. The arithmetic expressions are, for example, Expressions (11.2) to (11.
The value is changed according to the oxidation-reduction potential of the aerobic tank 2 as in 3). Qair = Qair0 + Kair111 (Pout-Pout *) (Vaer ≧ Vaer *) (11.2) Qair = Qair0 + Kair112 (Pout-Pout *) (Vaer <Vaer *) (11.3a) where: The oxidation-reduction potential Vaer * of the gas tank 2: a reference value of the oxidation-reduction potential Kair111: a constant (<0) Kair112: a constant (> 0) The output of the controller 28 is transmitted to the aeration device 3 via a signal line 28a.

That is, when the oxidation-reduction potential of the aerobic tank 2 is higher than a predetermined reference value, phosphorus is sufficiently taken in the aerobic tank 2, and the smaller the amount of aeration in the aerobic tank 2, the more phosphorus Is assumed to be discharged in a large amount, and the aeration amount is adjusted according to the equation (11.2). Conversely, when the oxidation-reduction potential of the aerobic tank 2 is lower than a predetermined reference value, the intake of phosphorus in the aerobic tank 2 is insufficient, and the amount of aeration in the aerobic tank 2 must be increased. Assuming that phosphorus is not taken, the formula (11.3)
Adjust the amount of aeration according to. With the above operation, the required amount of aeration can be provided without any excess or shortage, so that there is an effect that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

In the above description, the amount of phosphorus flowing out of the biological phosphorus removing device per unit time is determined from the product of the flow rate of the treated water discharged from the biological phosphorus removing device and the total phosphorus concentration in the treated water. Although the apparatus is configured to obtain the same, when the fluctuation of the flow rate of the treated water is small, the same effect can be obtained even if the flow meter is omitted and the apparatus is configured to be used for a necessary calculation as a predetermined value. .

In the above description, the device is configured to include an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the aerobic tank 2 as a means for detecting the excess or deficiency of the phosphorus intake from the phosphorus-accumulating bacteria. Other phosphorus intake detecting means shown in the ninth embodiment, for example, the concentration of phosphoric acid phosphorus in the anaerobic tank 1 and the aerobic tank 2
The same effect as described above can be obtained by providing a means for measuring the difference between the phosphoric acid and the phosphoric acid concentration. Further, similarly to the fifth embodiment, the apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for analyzing phosphorus.

Further, in the above description, the apparatus is configured so that the aeration amount is adjusted as the operation set value of the biological phosphorus removing apparatus. However, as described in the sixth and seventh embodiments, the other operation set values are set. For example, even if the apparatus is configured to adjust the amount of returned sludge or the amount of excess sludge withdrawn, the same effect as described above can be obtained. Also, in this case, similarly to Embodiment 5,
The apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for phosphorus analysis.

Embodiment 12 FIG. FIG. 11 shows Embodiment 12
1 is a block diagram showing a control device of a biological phosphorus removing device according to the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 10 denote the same or corresponding parts. In this embodiment, an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the anaerobic tank 1 is provided as means for detecting excess or deficiency of the amount of phosphorus discharged from the phosphorus-accumulating bacteria, and the operation set value of the biological phosphorus removal device is provided. The apparatus is configured to adjust the amount of aeration.

Reference numeral 30 denotes a flow meter for measuring the flow rate of the water to be treated flowing into the biological phosphorus removing device, and 31 denotes a total phosphorus concentration meter for measuring the total phosphorus concentration in the water to be treated. When the amount of phosphorus other than the phosphoric acid phosphorus contained in the water to be treated can be ignored, a phosphoric acid phosphorus concentration meter may be used instead of the total phosphorus concentration meter. Numeral 32 denotes an arithmetic unit for calculating the amount of phosphorus flowing into the biological phosphorus removing device per unit time, and the flow meter 30 and the signal line 3 are connected via a signal line 30a.
It is connected to the total phosphorus concentration meter 31 via 1a. Reference numeral 10 denotes an oxidation-reduction potential meter for measuring the oxidation-reduction potential of the anaerobic tank 1, and reference numeral 27 denotes a setting device for setting a target value of the amount of phosphorus flowing out.

Reference numeral 28 denotes a controller for adjusting the output of the aerator 3 in accordance with the deviation between the inflowing phosphorus amount and the target value of the outflowing phosphorus amount set in the setting device 27, and the oxidation-reduction potential of the anaerobic tank 1. , The arithmetic unit 32 via the signal line 32a and the signal line 10
a, the setting device 27 via a signal line 27a, and the aerator 3 via a signal line 28a.

In this embodiment, the flow meter 30
The positional relationship of the total phosphorus concentration meter 31 is not limited at all, and there is no problem even if the total phosphorus concentration meter 31 is on the upstream side and the flow meter 30 is on the downstream side. In addition, total phosphorus concentration meter 31
May be installed in another place and water may be collected from the pipe a, or the flow meter 30 may be installed in the pipe c. Further, the position of the oxidation-reduction potentiometer 10 is not limited to the anaerobic tank 1, and it is needless to say that water may be collected from the anaerobic tank 1 by being installed in another place.

Next, the operation will be described. The flow rate of the water to be treated flowing into the biological phosphorus removing device is measured by a flow meter 30,
The concentration of total phosphorus in the water to be treated is measured by a total phosphorus concentration meter 31, and the measured values are represented by a signal line 30a and a signal line 3 respectively.
It is transmitted to the arithmetic unit 32 via 1a. The calculator 32 calculates the amount of phosphorus flowing into the biological phosphorus removing device per unit time according to, for example, equation (12.1).

Pin = Qin × CTPin (12.1) where, Pin: amount of phosphorus flowing into the biological phosphorus removing device per unit time Qin: flow rate of water to be treated CTPin: total phosphorus concentration in water to be treated The output of the calculator 32 is transmitted to the controller 28 via the signal line 32a. Further, the oxidation-reduction potential of the anaerobic tank 1 is measured by the oxidation-reduction potentiometer 10, and the measured value is transmitted to the controller 28 via the signal line 10a. The target value of the amount of phosphorus discharged from the setter 27 is transmitted to the controller 28 via a signal line 27a.

The controller 28 adjusts the aeration amount according to the deviation between the measured value of the inflowing phosphorus amount and a predetermined target value of the outflowing phosphorus amount. The arithmetic expression is, for example, the expression (12.2).
The value is changed according to the oxidation-reduction potential of the anaerobic tank 1 as in (12.3). Qair = Qair0 + Kair121 (Pin-Pout *) (Vana <Vana *) (12.2) Qair = Qair0 + Kair122 (Pin-Pout *) (Vana ≧ Vana *) (12.3) Quantity Qair0: constant Kair121: constant (> 0) Kair122: constant (<0) Pout *: target value of the amount of phosphorus discharged The output of the controller 28 is transmitted to the aeration apparatus 3 via a signal line 28a.

That is, when the oxidation-reduction potential of the anaerobic tank 1 is lower than a predetermined reference value, phosphorus is sufficiently discharged in the anaerobic tank 1, and as the aeration amount in the aerobic tank 2 increases, the phosphorus increases. Adjust the aeration according to equation (12.2), assuming a large intake. On the other hand, when the oxidation-reduction potential of the anaerobic tank 1 is higher than a predetermined reference value, the discharge of phosphorus in the anaerobic tank 1 is insufficient, and phosphorus must be squeezed in the aerobic tank 2 if the amount of aeration is not reduced. Assuming that ejection is not performed, the equation (12.3)
Adjust the amount of aeration according to. With the above operation, the required amount of aeration can be given as soon as possible, so that there is an effect that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

In the above description, the amount of phosphorus flowing into the biological phosphorus removing device per unit time is determined by multiplying the flow rate of the water flowing into the biological phosphorus removing device by the total phosphorus concentration in the water. However, if the fluctuation in the flow rate of the water to be treated is small, the same effect can be obtained even if the flow meter is omitted and the device is configured to be used for necessary calculations as a predetermined value. To play.

In the above description, the apparatus is configured to include an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the anaerobic tank 1 as means for detecting the excess or deficiency of the amount of phosphorus discharged from the phosphorus-accumulating bacteria. The same effects as described above can be obtained by providing another means for detecting the amount of discharged phosphorus shown in the first, third, and fourth embodiments, for example, a measuring device for measuring the phosphorus content of the phosphorus-accumulating bacteria in the anaerobic tank 1. Further, similarly to the fifth embodiment, the apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for analyzing phosphorus.

Further, in the above description, the apparatus is configured so that the aeration amount is adjusted as the operation set value of the biological phosphorus removing apparatus. However, as described in the sixth and seventh embodiments, the other operation set values are set. For example, even if the apparatus is configured to adjust the amount of returned sludge or the amount of excess sludge withdrawn, the same effect as described above can be obtained. Also in this case, as in the case of the fifth embodiment, the apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for analyzing phosphorus.

Embodiment 13 FIG. FIG. 12 shows Embodiment 1.
FIG. 13 is a configuration diagram showing a control device of the biological phosphorus removing device according to No. 3, in which the same reference numerals as those in FIGS. 1 to 11 indicate the same or corresponding parts. In the present embodiment,
An oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the aerobic tank 2 is provided as means for detecting the excess or deficiency of the phosphorus intake from the phosphorus accumulating bacteria, and a device for adjusting the aeration amount as the operation set value of the raw device. It is what constituted.

Numeral 30 is a flow meter for measuring the flow rate of the water to be treated flowing into the biological phosphorus removing device, and 31 is a total phosphorus concentration meter for measuring the total phosphorus concentration in the water to be treated. When the amount of phosphorus other than the phosphoric acid phosphorus contained in the water to be treated can be ignored, a phosphoric acid phosphorus concentration meter may be used instead of the total phosphorus concentration meter. Numeral 32 denotes an arithmetic unit for calculating the amount of phosphorus flowing into the biological phosphorus removing device per unit time, and the flow meter 30 and the signal line 3 are connected via a signal line 30a.
It is connected to the total phosphorus concentration meter 31 via 1a. Reference numeral 29 denotes an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the aerobic tank 2, and reference numeral 27 denotes a setting device for setting a target value of the amount of phosphorus flowing out.

Reference numeral 28 denotes a controller for adjusting the output of the aeration device 3 in accordance with the deviation between the inflowing phosphorus amount and the target value of the outflowing phosphorus amount set in the setting device 27, and the oxidation-reduction potential of the aerobic tank 2. The operation unit 32 is connected to the signal line 29 via the signal line 32a.
The redox potentiometer 29 is connected via a, the setting device 27 via a signal line 27a, and the aeration apparatus 3 via a signal line 28a.

In this embodiment, the flow meter 30
The positional relationship of the total phosphorus concentration meter 31 is not limited at all, and there is no problem even if the total phosphorus concentration meter 31 is on the upstream side and the flow meter 30 is on the downstream side. In addition, total phosphorus concentration meter 31
May be installed in another place and water may be collected from the pipe a, or the flow meter 30 may be installed in the pipe c. Further, the position of the oxidation-reduction potentiometer 29 is not limited to the aerobic tank 2, and it goes without saying that water may be collected from the aerobic tank 2 at another location.

Next, the operation will be described. The flow rate of the water to be treated flowing into the biological phosphorus removing device is measured by a flow meter 30,
The concentration of total phosphorus in the water to be treated is measured by a total phosphorus concentration meter 31, and the measured values are represented by a signal line 30a and a signal line 3 respectively.
It is transmitted to the arithmetic unit 32 via 1a. The calculator 32 calculates the amount of phosphorus flowing out of the biological phosphorus removing device per unit time according to, for example, equation (12.1). The output of the arithmetic unit 32 is sent to the controller 2 via a signal line 32a.
It is conveyed to 8.

The oxidation-reduction potential of the aerobic tank 2 is measured by an oxidation-reduction potentiometer 29, and the measured value is transmitted to a controller 28 via a signal line 29a. The target value of the amount of phosphorus discharged from the setter 27 is transmitted to the controller 28 via a signal line 27a. The controller 28 adjusts the aeration amount according to the deviation between the measured value of the inflowing phosphorus amount and a predetermined target value of the outflowing phosphorus amount. The arithmetic expression is, for example, Expression (13.2).
To (13.3), depending on the oxidation-reduction potential of the aerobic tank 2.

Qair = Qair0 + Kair131 (Pin-Pout *) (Vaer ≧ Vaer *) (13.2) Qair = Qair0 + Kair132 (Pin-Pout *) (Vaer <Vaer *) (13.3) Qair: aeration amount Qair0: constant Kair131: constant (<0) Kair132: constant (> 0) Pout *: target value of the amount of phosphorus discharged The output of the controller 28 is transmitted to the aeration apparatus 3 via a signal line 28a.

That is, when the oxidation-reduction potential of the aerobic tank 2 is higher than a predetermined reference value, phosphorus is sufficiently taken in the aerobic tank 2 and the smaller the aeration amount in the aerobic tank 2, Assuming that a lot of phosphorus is discharged, the aeration amount is adjusted according to the equation (13.2). Conversely, when the oxidation-reduction potential of the aerobic tank 2 is lower than a predetermined reference value, the intake of phosphorus in the aerobic tank 2 is insufficient, and the amount of aeration in the aerobic tank 2 must be increased. Assuming that phosphorus is not taken, the formula (13.
Adjust the amount of aeration according to 3). By the above operation,
Since the required amount of aeration can be given earlier, there is an effect that the amount of phosphorus flowing out from the biological phosphorus removing device can be surely reduced.

In the above description, the amount of phosphorus flowing into the biological phosphorus removing device per unit time is calculated by multiplying the flow rate of the water flowing into the biological phosphorus removing device by the total phosphorus concentration in the water. However, if the fluctuation in the flow rate of the water to be treated is small, the same effect can be obtained even if the flow meter is omitted and the device is configured to be used for necessary calculations as a predetermined value. To play.

In the above description, the apparatus is configured to include an oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the aerobic tank 2 as a means for detecting the excess or deficiency of the amount of phosphorus discharged from the phosphorus accumulating bacteria. The other phosphorus discharge amount detecting means shown in the ninth embodiment, for example, a means for measuring the difference between the phosphoric acid phosphorus concentration in the anaerobic tank 1 and the phosphoric phosphorus concentration in the aerobic tank 2 may be provided. A similar effect is achieved. Further, similarly to the fifth embodiment, the apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for analyzing phosphorus.

Further, in the above description, the apparatus is configured so as to adjust the aeration amount as the operation set value of the biological phosphorus removing apparatus. However, as described in the sixth and seventh embodiments, other operation set values are set. For example, even if the apparatus is configured to adjust the amount of returned sludge or the amount of excess sludge withdrawn, the same effect as described above can be obtained. Also, in this case, similarly to Embodiment 5,
The apparatus can be configured so that the total phosphorus concentration in the treated water can be estimated in consideration of the time required for phosphorus analysis.

Embodiment 14 FIG. FIG. 13 shows a fourteenth embodiment.
1 is a configuration diagram showing a control device of a biological phosphorus nitrogen removal device according to the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 12 indicate the same or corresponding parts. In the present embodiment, the apparatus is configured to detect the change tendency of the inflow water amount from the inflow water amount and correct the output of the controller.

Reference numeral 30 denotes a flow meter for measuring the flow rate of the water to be treated flowing into the biological phosphorus removing device, and reference numeral 31 denotes a total phosphorus concentration meter for measuring the total phosphorus concentration in the water to be treated. When the amount of phosphorus other than the phosphoric acid phosphorus contained in the water to be treated can be ignored, a phosphoric acid phosphorus concentration meter may be used instead of the total phosphorus concentration meter. Numeral 32 denotes an arithmetic unit for calculating the amount of phosphorus flowing into the biological phosphorus removing device per unit time, and the flow meter 30 and the signal line 3 are connected via a signal line 30a.
It is connected to the total phosphorus concentration meter 31 via 1a. Reference numeral 10 denotes an oxidation-reduction potential meter for measuring the oxidation-reduction potential of the anaerobic tank 1, and reference numeral 27 denotes a setting device for setting a target value of the amount of phosphorus flowing out.

Numeral 28 denotes an adjuster for adjusting the output of the aerator 3 in accordance with the deviation between the inflowing phosphorus amount and the target value of the outflowing phosphorus amount set in the setting device 27 and the oxidation-reduction potential of the anaerobic tank 1. , The arithmetic unit 32 via the signal line 32a and the signal line 10
The redox potentiometer 10 is connected to the setting device 27 via a signal line 27a. 33 is a controller 28
Is a corrector for correcting the output from the
The flow controller 30 is connected to the regulator 28 via a, the signal line 30b, and the aeration apparatus 3 via the signal line 33a.

In this embodiment, the flow meter 30
The positional relationship of the total phosphorus concentration meter 31 is not limited at all, and there is no problem even if the total phosphorus concentration meter 31 is on the upstream side and the flow meter 30 is on the downstream side. In addition, total phosphorus concentration meter 31
May be installed in another place and water may be collected from the pipe a, or the flow meter 30 may be installed in the pipe c. Further, the position of the oxidation-reduction potentiometer 10 is not limited to the anaerobic tank 1, but may be installed in another place to collect water from the anaerobic tank 1.

Next, the operation will be described. The flow rate of the water to be treated flowing into the biological phosphorus removing device is measured by a flow meter 30,
The concentration of total phosphorus in the water to be treated is measured by a total phosphorus concentration meter 31, and the measured values are represented by a signal line 30a and a signal line 3 respectively.
It is transmitted to the arithmetic unit 32 via 1a. The arithmetic unit 32 calculates the amount of phosphorus flowing into the biological phosphorus removing device per unit time according to, for example, equation (12.1), and outputs the arithmetic unit 32 to the controller 28 via the signal line 32a. Reportedly.

The oxidation-reduction potential of the anaerobic tank 1 is measured by the oxidation-reduction potentiometer 10, and the measured value is transmitted to the controller 28 via the signal line 10a. The target value of the amount of phosphorus discharged from the setter 27 is transmitted to the controller 28 via a signal line 27a. The controller 28 calculates the aeration amount in accordance with the deviation between the measured value of the inflowing phosphorus amount and a predetermined target value of the outflowing phosphorus amount. The arithmetic expression is, for example, Expression (12.2).
The value is changed according to the oxidation-reduction potential of the anaerobic tank 1 as in (12.3). At the same time, the flow rate of the inflow water is
And transmitted to the compensator 33 via the signal line 30b. In the compensator 33, according to the change tendency of the inflow water amount,
A calculation value for correcting the output of the controller 28 is calculated, and is calculated according to, for example, Expression (14.1).

H = H0 + Khosei (Qin−Qin−1) (14.1) where, H: correction value H0: constant Khosei: constant Qin: current inflow water Qin−1: inflow water before one step Here, One step before refers to about 30 minutes to a few hours ago. The output from the controller 28 is corrected in the corrector 33 according to, for example, equation (14.2). QairH = Qair × H (14.2) The output from the corrector 33 is transmitted to the aeration apparatus 3 via the signal line 33a.

Accordingly, when the amount of inflow water increases or decreases, the amount of phosphorus discharged from the anaerobic tank 1 depends on
The aeration amount is increased or decreased, and the aeration amount is appropriately adjusted. That is, even when the amount or concentration of sewage flowing into the biological water treatment apparatus fluctuates, the necessary aeration amount is more quickly and appropriately supplied to the aerobic tank 2 by considering the change tendency of the flow rate of the inflow water. The effect is that the total amount of phosphorus flowing out can be maintained at a predetermined value.

In this embodiment, the correction value is calculated based on the change tendency of the flow rate of the inflow water. However, instead of the flow rate of the inflow water, the oxidation-reduction potential value of the anaerobic tank 1, the dissolved oxygen value, the MLSS
Value or oxidation-reduction potential value of the aerobic tank 2, dissolved oxygen value, M
It is also possible to adopt a configuration in which the correction value is calculated based on the LSS value or the like. A similar compensator may be attached to the devices shown in FIGS. 9, 10, and 12.

As described above, the output of the adjusting means is corrected by using the plant data such as the increasing tendency of the water to be treated, so that the amount of sewage flowing into the biological water treatment apparatus is corrected. Even if the concentration fluctuates, the operation set values for phosphorus discharge and phosphorus intake can be adjusted appropriately as soon as possible, and the amount of phosphorus flowing out from the biological phosphorus removing device can be reliably reduced.

Embodiment 15 FIG. Embodiments 10 to 1
In No. 4, a flow meter is provided to measure the amount of inflow water or the amount of discharge water. However, when the fluctuation of the amount of inflow sewage is small, this is omitted, and a predetermined flow rate is set and used for necessary calculations. The device can also be configured as follows.

Further, in each of the above embodiments, an example is shown in which a time-continuous analog type is used, but a time-discontinuous analog type (sample value type) or digital type may be used.
The same effects as in the above embodiment can be obtained.

In each of the above embodiments, the control circuit configuration is shown. However, even if the control circuit configuration is programmed in a computer and mounted, the same effects as those of the above embodiments can be obtained.

In each of the above embodiments, the control circuit is configured as a closed loop, but may be configured as a driving support system that presents a control target value to an operator.

[0129]

According to the biological phosphorus removing device according to the first aspect of the present invention, the biological reaction tank which is composed of an anaerobic tank and an aerobic tank while sewage flows therein, and is attached to the aerobic tank. A biological phosphorus removal device comprising:
Means for measuring the phosphorus concentration in the anaerobic tank, means for setting a target value of the phosphorus concentration, and means for adjusting the amount of aeration according to the difference between the phosphorus concentration and the target value are provided. Even when the amount or concentration of sewage flowing into the treatment device fluctuates, the operation setting value for phosphorus discharge is appropriately adjusted, and the effect of reliably reducing the amount of phosphorus flowing out from the biological phosphorus removal device is exhibited. .

According to the biological phosphorus removing apparatus according to the second aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while the sewage flows therein, and the aeration attached to the aerobic tank A biological phosphorus removing device having a device, a means for measuring an oxidation-reduction potential in an anaerobic tank, a means for setting a target value of the oxidation-reduction potential, and a device for determining a difference between the oxidation-reduction potential and the target value. A means for adjusting the amount of aeration by means of water, so that even when the amount or concentration of sewage flowing into the biological water treatment apparatus fluctuates, the operation set value for phosphorus discharge is appropriately adjusted, and the biological phosphorus is adjusted. This has the effect of reliably reducing the amount of phosphorus flowing out of the removing device.

According to the biological phosphorus removing apparatus according to the third aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while the sewage flows in, and the aeration tank attached to the aerobic tank A biological phosphorus removing device having a device, means for measuring the phosphorus content of phosphorus accumulating bacteria in an anaerobic tank, means for setting a target value of the phosphorus content, and a phosphorus content and a target value. Since means for adjusting the aeration amount according to the difference between the two are provided, even when the amount or concentration of sewage flowing into the biological water treatment apparatus fluctuates, the operation setting value for phosphorus discharge is appropriately adjusted, This has the effect of reliably reducing the amount of phosphorus flowing out of the biological phosphorus removing device.

According to the biological phosphorus removing apparatus according to the fourth aspect of the present invention, the biological reaction tank comprising the anaerobic tank and the aerobic tank while the sewage flows therein, and the aeration tank attached to the aerobic tank A biological phosphorus removal device having a device for determining a difference between a phosphorus concentration in an anaerobic tank and a phosphorus concentration in inflow sewage, a means for setting a target value of the difference, and a phosphorus in the anaerobic tank. A means is provided for adjusting the amount of aeration in accordance with the difference between the target concentration and the difference between the concentration and the phosphorus concentration in the incoming sewage, so that when the amount or concentration of sewage flowing into the biological water treatment device fluctuates This also has the effect of appropriately adjusting the operation setting value for phosphorus discharge and reliably reducing the amount of phosphorus flowing out of the biological phosphorus removal device.

According to the biological phosphorus removing apparatus according to the fifth aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while the sewage flows in, and the mixing reaction flowing out of the biological reaction tank. A sedimentation basin for sedimentation of a liquid, and a biological phosphorus removing device having means for returning the settled sludge to the biological reaction tank, wherein a means for measuring the phosphorus concentration in the anaerobic tank; Since the means for setting the target value and the means for adjusting the amount of returned sludge according to the difference between the phosphorus concentration and the target value are provided, when the amount or concentration of the sewage flowing into the biological water treatment apparatus fluctuates. This also has the effect of appropriately adjusting the operation setting value for phosphorus discharge and reliably reducing the amount of phosphorus flowing out of the biological phosphorus removal device.

According to the biological phosphorus removing apparatus according to the sixth aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while receiving the sewage, and the mixing reaction flowing out of the biological reaction tank. A biological phosphorus removing device having a sedimentation basin for performing a sedimentation treatment on a liquid, and a means for extracting precipitated excess sludge, a means for measuring a phosphorus concentration in an anaerobic tank, and a target value of the phosphorus concentration. Means, and means for adjusting the amount of excess sludge withdrawal according to the difference between the phosphorus concentration and the target value, so that even if the amount or concentration of sewage flowing into the biological water treatment apparatus fluctuates. In addition, it is possible to appropriately adjust the operation set value relating to the phosphorus discharge and to surely reduce the amount of phosphorus flowing out from the biological phosphorus removing device.

According to the biological phosphorus removing apparatus according to the seventh aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while the sewage flows therein, and the aeration tank attached to the aerobic tank. A biological phosphorus removal device having a device for determining a difference between a phosphorus concentration in an anaerobic tank and a phosphorus concentration in an aerobic tank; a means for setting a target value of the difference; Means for adjusting the amount of aeration according to the difference between the phosphorus concentration and the difference between the phosphorus concentration in the incoming sewage and the target value was provided, so that the amount and concentration of the sewage flowing into the biological water treatment equipment fluctuated. Also,
The effect is obtained that the operation set value relating to the phosphorus discharge is appropriately adjusted and the amount of phosphorus flowing out from the biological phosphorus removing device can be reliably reduced.

According to the biological phosphorus removing apparatus according to the eighth aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while the sewage flows in, and the aeration tank attached to the aerobic tank A biological phosphorus removing device having a device for measuring the amount of phosphorus flowing out or flowing in from the biological phosphorus removing device, and a device for setting a target value of the amount of phosphorus flowing out. , Means for measuring the oxidation-reduction potential in the anaerobic tank, and means for adjusting the aeration amount according to the difference between the amount of phosphorus discharged or inflowed and the target value and the oxidation-reduction potential, so that biological water treatment Even if the amount or concentration of sewage flowing into the device fluctuates, the operation setting values for phosphorus discharge and intake can be appropriately adjusted, and the effect of reliably reducing the amount of phosphorus flowing out from the biological phosphorus removal device can be obtained. Play.

According to the biological phosphorus removing apparatus according to the ninth aspect of the present invention, the biological reaction tank including the anaerobic tank and the aerobic tank while the sewage flows in, and the aeration tank attached to the aerobic tank A biological phosphorus removing device having a device for measuring the amount of phosphorus flowing out or flowing in from the biological phosphorus removing device, and a device for setting a target value of the amount of phosphorus flowing out. A means for measuring the oxidation-reduction potential in the aerobic tank, and a means for adjusting the aeration amount according to the difference between the outflow or inflow phosphorus amount and the target value and the oxidation-reduction potential. Even if the amount and concentration of sewage flowing into the treatment equipment fluctuates, the operation setting values for phosphorus discharge and intake can be appropriately adjusted, and the amount of phosphorus flowing out of the biological phosphorus removal device can be reliably reduced. To play.

According to the biological phosphorus removing apparatus according to the tenth aspect of the present invention, the compensator for compensating the output of the adjusting means according to the change tendency of the effluent water amount or the inflow water amount is provided.
Even if the amount or concentration of sewage flowing into the biological water treatment equipment fluctuates, the operation setting values for phosphorus discharge and phosphorus intake should be adjusted appropriately as soon as possible to reduce the amount of phosphorus flowing out from the biological phosphorus removal equipment. This has the effect of being able to reliably reduce.

According to the biological phosphorus removing apparatus according to the eleventh aspect of the present invention, a means for estimating a measured value at an arbitrary time using the measured value obtained by the measuring means is provided.
Even in the case where it takes time to analyze the phosphorus concentration and the like, it is possible to estimate the phosphorus concentration and the like in consideration of the fluctuation during this time, and it is possible to reliably reduce the amount of phosphorus flowing out from the biological phosphorus removing device. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a biological phosphorus removing device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a biological phosphorus removing device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a biological phosphorus removing device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a biological phosphorus removing device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a biological phosphorus removing device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a biological phosphorus removing device according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a biological phosphorus removing device according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram showing a biological phosphorus removing apparatus according to Embodiment 9 of the present invention.

FIG. 9 is a configuration diagram showing a biological phosphorus removing apparatus according to Embodiment 10 of the present invention.

FIG. 10 is a configuration diagram showing a biological phosphorus removing device according to Embodiment 11 of the present invention.

FIG. 11 is a configuration diagram showing a biological phosphorus removing apparatus according to Embodiment 12 of the present invention.

FIG. 12 is a configuration diagram showing a biological phosphorus removing apparatus according to Embodiment 13 of the present invention.

FIG. 13 is a configuration diagram showing a biological phosphorus removing apparatus according to Embodiment 14 of the present invention.

FIG. 14 is a configuration diagram showing a conventional biological phosphorus removing device.

[Explanation of symbols]

1 anaerobic tank, 2 aerobic tank, 3 aeration device, 4 sedimentation basin,
5 Excess sludge pump, 6 Return sludge pump, 7, 14, 1
5,20,25,31 Phosphorus concentration meter, 9,23,28
Controller, 10,29 Redox potential meter, 12 Phosphorus content measuring device, 18 Storage circuit, 24,30 Flow meter, 33
Compensator.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiji Furukawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Junji Hirotsuji 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 2-3 Ryo Denki Co., Ltd.

Claims (11)

[Claims] 1. A biological phosphorus removal device comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aeration apparatus attached to the aerobic tank.
Means for measuring the phosphorus concentration in the anaerobic tank, means for setting a target value of the phosphorus concentration, and means for adjusting the amount of aeration according to the difference between the phosphorus concentration and the target value. And biological phosphorus removal equipment. 2. A biological phosphorus removing apparatus comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aerator attached to the aerobic tank.
Means for measuring the oxidation-reduction potential in the anaerobic tank, means for setting the target value of the oxidation-reduction potential, and means for adjusting the amount of aeration according to the difference between the oxidation-reduction potential and the target value are provided. A biological phosphorus removing device, characterized in that: 3. A biological phosphorus removal apparatus comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aeration apparatus attached to the aerobic tank.
Means for measuring the phosphorus content of the phosphorus accumulating bacteria in the anaerobic tank, means for setting a target value of the phosphorus content, and means for adjusting the amount of aeration according to the difference between the phosphorus content and the target value And a biological phosphorus removing device. 4. A biological phosphorus removing apparatus comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aeration apparatus attached to the aerobic tank.
Means for determining the difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the incoming sewage; means for setting the target value of the difference; and the difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the incoming sewage. Means for adjusting the amount of aeration according to the difference between the target value and the target value. 5. A biological reaction tank including an anaerobic tank and an aerobic tank into which sewage flows, a sedimentation tank for performing a sedimentation treatment on a mixed solution flowing out of the biological reaction tank, and the settled sludge. In a biological phosphorus removing device having means for returning to a biological reaction tank, means for measuring the phosphorus concentration in the anaerobic tank, means for setting a target value of the phosphorus concentration, and the phosphorus concentration and the target value. A means for adjusting the amount of returned sludge according to the difference in the amount of sludge. 6. A biological reaction tank including an anaerobic tank and an aerobic tank into which sewage flows, a sedimentation tank for performing a sedimentation treatment on a mixed solution flowing out of the biological reaction tank, and an excess sludge that has settled. In a biological phosphorus removing device having a means for extracting, a means for measuring a phosphorus concentration in the anaerobic tank, a means for setting a target value of the phosphorus concentration, and a difference between the phosphorus concentration and the target value. Means for adjusting the amount of excess sludge withdrawal according to the requirement. 7. A biological phosphorus removal apparatus comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aeration apparatus attached to the aerobic tank.
Means for determining the difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the aerobic tank, and means for setting a target value for the difference,
A biological phosphorus removing device provided with means for adjusting the amount of aeration according to a difference between the phosphorus concentration in the anaerobic tank and the phosphorus concentration in the inflow sewage and the target value. 8. A biological phosphorus removing device comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aeration apparatus attached to the aerobic tank.
Means for measuring the amount of phosphorus flowing out or inflowing from the biological phosphorus removing device, means for setting a target value of the amount of phosphorus discharged, and means for measuring the oxidation-reduction potential in the anaerobic tank. The difference between the outflow or inflow phosphorus amount and the target value,
And a means for adjusting the amount of aeration according to the oxidation-reduction potential. 9. A biological phosphorus removal device comprising: a biological reaction tank into which sewage flows and an anaerobic tank and an aerobic tank; and an aeration apparatus attached to the aerobic tank.
Means for measuring the amount of phosphorus flowing out or flowing in from the biological phosphorus removing apparatus, means for setting a target value of the amount of phosphorus discharged, and means for measuring the oxidation-reduction potential in the aerobic tank And the difference between the outflow or inflow phosphorus amount and the target value,
And a means for adjusting the amount of aeration according to the oxidation-reduction potential. 10. The biological phosphorus removing apparatus according to claim 8, further comprising a corrector for correcting an output of the adjusting means according to a change tendency of the amount of outflow water or the amount of inflow water. 11. The organism according to claim 1, further comprising means for estimating a measured value at an arbitrary time using a measured value obtained by the measuring means. Phosphorus removal device.