JP2021109139A - Information processing device, information processing method, and program - Google Patents

Abstract

To provide an information processing device which can automatically control a ratio between ammonia nitrogen and nitrite nitrogen contained in wastewater.SOLUTION: An information processing device 20 comprises a CPU 21. The CPU 21 derives a regression equation in which a concentration difference value ΔN obtained by subtracting a nitrite nitrogen concentration from an ammonia nitrogen concentration is defined as an objective variable, and pH and electric conductivity are defined as explanatory variables, calculates the concentration difference value ΔN using the derived regression equation and values of the pH and the electric conductivity, determines whether or not the calculated concentration difference value ΔN is a value within a predetermined range, and controls an amount of air supplied by an air diffuser 11 to control the nitrite nitrogen concentration according to a result of determination made as to whether or not the concentration difference value ΔN is the value within the predetermined range.SELECTED DRAWING: Figure 4

Description

The present invention relates to an information processing apparatus, an information processing method and a program used for wastewater treatment.

Conventionally, a wastewater treatment device used for removing a nitrogen component contained in wastewater, specifically, ammoniacal nitrogen constituting ammonia from the wastewater (hereinafter referred to as "raw water") has been known. (See, for example, Patent Document 1.). The wastewater treatment apparatus of Patent Document 1 includes a first treatment tank and a second treatment tank. The first treatment tank has an air diffuser and ammonia-oxidizing bacteria, and the second treatment tank has anamox bacteria. In the first treatment tank, the air diffuser supplies air to the raw water, and the ammonia-oxidizing bacteria oxidize ammonia based on the ammonia contained in the raw water and the air supplied to the raw water to produce nitrite. Therefore, the wastewater that fills the first treatment tank has ammoniacal nitrogen and nitrite nitrogen that constitutes nitrite.

When the ratio of ammoniacal nitrogen and nitrite nitrogen contained in the wastewater is 1.5: 1 to 1: 1.5, the wastewater that constitutes that ratio (hereinafter, the ratio is referred to as the "appropriate ratio", and the wastewater is the wastewater. Is referred to as "appropriate intermediate wastewater") is sent to the second treatment tank. In the second treatment tank, the anamox bacteria convert the ammoniacal nitrogen and nitrite nitrogen contained in the proper intermediate wastewater into nitrogen gas according to the anamox reaction (Equation 1), and the ammoniacal nitrogen and nitrite nitrogen from the proper intermediate wastewater. To remove.

By the way, whether or not the ratio of ammoniacal nitrogen and nitrite nitrogen contained in wastewater is an appropriate ratio is determined by, for example, measuring the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen. When the manager of the wastewater treatment equipment measures the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen and the ratio of ammoniacal nitrogen and nitrite nitrogen is an appropriate ratio, the wastewater is the second appropriate intermediate wastewater. Water is sent to the treatment tank.

On the other hand, the manager of the wastewater treatment equipment measures the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen, and when the ratio of ammoniacal nitrogen and nitrite nitrogen is larger than the appropriate ratio, it is supplied from the air diffuser. Increase the amount of air and decrease the amount of air supplied from the air diffuser when the ratio of ammoniacal nitrogen and nitrite nitrogen is smaller than the proper ratio. As a result, the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen change, and the ratio of ammoniacal nitrogen and nitrite nitrogen is adjusted to an appropriate ratio.

Japanese Patent Application No. 2019-138985

However, the measuring instrument for measuring the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen must be calibrated in order to measure the accurate concentration, and the burden of calibrating the measuring instrument is heavy. In addition, after a certain period of use, each measuring instrument cannot measure an accurate concentration even if it is calibrated frequently, and therefore must be replaced regularly. In general, each measuring instrument is expensive, and if regular replacement is required, the financial burden of maintaining the wastewater treatment equipment increases. That is, there is a problem that the burden of maintenance of each measuring instrument is large.

Correspondingly, the wastewater treatment equipment manager may adjust the amount of air supplied from the air diffuser based on his intuition and experience, and adjust the ratio of ammoniacal nitrogen and nitrite nitrogen. be. In this case, only the manager of a specific wastewater treatment device can adjust the ratio of ammoniacal nitrogen and nitrite nitrogen, and cannot automatically adjust the ratio of ammoniacal nitrogen and nitrite nitrogen. There's a problem.

An object of the present invention is to provide an information processing apparatus, an information processing method, and a program capable of automatically controlling the ratio of ammoniacal nitrogen and nitrite nitrogen contained in waste water.

In order to achieve the above object, the information processing apparatus of the present invention is an information processing apparatus used for wastewater treatment for removing ammoniacal nitrogen and nitrite nitrogen contained in wastewater from the wastewater, and information on the wastewater. An acquisition means for acquiring relationship verification data having a plurality of information groups including the concentration of the ammoniacal nitrogen, the concentration of the nitrite nitrogen, the first information, and the second information collected at the same timing. By using the relationship verification data, the difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen, and the relational expression showing the relationship between the first information and the second information can be obtained. The derivation means to be derived, the third information used as the first information constituting the relational expression, and the fourth information used as the second information constituting the relational expression are acquired, and the third information is obtained. And the calculation means for calculating the difference value between the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen related to the fourth information using the relational expression, and according to the calculated difference value. It is characterized by comprising a control means for controlling the concentration of the nitrite nitrogen.

In order to achieve the above object, the information processing method of the present invention is an information processing method used for wastewater treatment for removing ammoniacal nitrogen and nitrite nitrogen contained in wastewater from the wastewater, and information on the wastewater. Acquiring the relationship verification data having a plurality of information groups including the concentration of the ammoniacal nitrogen, the concentration of the nitrite nitrogen, the first information, and the second information collected at the same timing as By using the relationship verification data, the difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen, and the relational expression showing the relationship between the first information and the second information can be obtained. The derivation step to be derived, the third information used as the first information constituting the relational expression after the relationship verification data is acquired, and the second information used as the second information constituting the relational expression. With the calculation step of acquiring the information of 4 and calculating the difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen related to the third information and the fourth information using the relational expression. It is characterized by having a control step for controlling the concentration of the nitrite nitrogen according to the calculated difference value.

In order to achieve the above object, the program of the present invention is a program for causing a computer to execute an information processing method used for wastewater treatment for removing ammoniacal nitrogen and nitrite nitrogen contained in wastewater from the wastewater. The information processing method includes a plurality of information groups including the concentration of the ammoniacal nitrogen, the concentration of the nitrite nitrogen, the first information, and the second information collected at the same timing as the information of the wastewater. The acquisition step for acquiring the relationship verification data to have, the difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen, and the relational expression showing the relationship between the first information and the second information. , The derivation step derived by using the relationship verification data, the third information used as the first information constituting the relational expression after acquiring the relationship verification data, and the relational expression. The fourth information used as the second information is acquired, and the difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen related to the third information and the fourth information is obtained. It is characterized by having a calculation step calculated by using a relational expression and a control step of controlling the concentration of the nitrite nitrogen according to the calculated difference value.

According to the present invention, the ratio of ammoniacal nitrogen and nitrite nitrogen contained in wastewater can be automatically controlled.

It is a block diagram which shows schematic structure of the wastewater treatment apparatus used when treating wastewater in embodiment of this invention. FIG. 5 is a block diagram schematically showing a configuration of an information processing apparatus used for investigating the relationship between a plurality of information obtained from wastewater treated using the wastewater treatment apparatus of FIG. 1. It is a flowchart which shows the procedure of the regression type derivation process executed by the information processing apparatus of FIG. It is a flowchart which shows the procedure of the control processing executed by the information processing apparatus of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram schematically showing the configuration of a wastewater treatment apparatus 10 used when treating wastewater in the embodiment of the present invention.

The wastewater treatment apparatus 10 of FIG. 1 is used to perform a nitrogen removal treatment for removing ammoniacal nitrogen contained in wastewater, and includes a treatment tank 10a and a treatment tank 10b. The treatment tank 10a has an air diffuser 11, pumps P1, and columns 12 and 13, and also has an ammonia-oxidizing bacterium (not shown) that converts ammoniacal nitrogen into nitrite nitrogen in the presence of oxygen, and the pump P1 has. It is connected to column 12, and column 13 is connected to column 12. The treatment tank 10b has a pump P2 and a nitrogen removing region 14, and an anamox bacterium (not shown) is present in the nitrogen removing region 14.

When the raw water is filled in the treatment tank 10a, the air diffuser 11 is driven. The air diffuser 11 supplies air to the raw water, and the ammonia-oxidizing bacteria oxidize the ammonia contained in the raw water to produce nitrite. As a result, the raw water is changed to wastewater containing ammoniacal nitrogen and nitrite nitrogen (hereinafter referred to as "intermediate wastewater").

Next, when the pump P1 is driven, the intermediate wastewater circulates in the treatment tank 10a, and the intermediate wastewater is supplied from the pump P1 to the column 12. The column 12 is, for example, a cylindrical tube, one end of the column 12 is closed by being fixed to the bottom of the treatment tank 10a, and the other end of the column 12 protrudes from the water surface of the intermediate drainage filling the treatment tank 10a. It is open. Therefore, the column 12 has a fixing portion 12a fixed to the bottom of the treatment tank 10a and an opening 12b protruding from the water surface of the intermediate drainage.

Further, the column 12 is supplied to the inside of the column 12 from the supply unit 12c around the opening 12b and the supply unit 12c for supplying the intermediate drainage from the pump P1 to the inside of the column 12 around the fixed portion 12a. It is provided with a discharge unit 12d for discharging intermediate wastewater. The intermediate drainage is supplied from the supply unit 12c to the inside of the column 12, forms an upward flow 12e flowing in the direction from the fixing portion 12a to the opening 12b inside the column 12, and is discharged from the discharge unit 12d to the outside of the column 12. NS. The intermediate wastewater discharged to the outside of the column 12 is supplied to the inside of the column 13.

The column 13 is, for example, a cylindrical tube, one end of the column 13 is closed by being fixed to the bottom of the treatment tank 10a, and the other end of the column 13 protrudes from the water surface of the intermediate drainage filling the treatment tank 10a. It is open. Therefore, the column 13 has a fixing portion 13a fixed to the bottom of the treatment tank 10a and an opening 13b protruding from the water surface of the intermediate drainage.

Further, the column 13 has a supply unit 13c for supplying the intermediate drainage discharged to the outside of the column 12 to the inside of the column 13 around the fixed portion 13a, and a supply unit 13c to the column 13 around the opening 13b. It is provided with a discharge unit 13d for discharging the intermediate wastewater supplied to the inside. The intermediate drainage is supplied from the supply unit 13c to the inside of the column 13, forms an upward flow 13e flowing in the direction from the fixing portion 13a to the opening 13b inside the column 13, and is discharged from the discharge unit 13d to the outside of the column 13. NS.

By the way, activated sludge containing various bacteria such as anamox bacteria (hereinafter, referred to as "bacterial-containing sludge") exists in the treatment tank 10a. Ammonia nitrogen and nitrite nitrogen contained in the intermediate wastewater pass through the activated sludge constituting the fungus-containing sludge and reach the anamox bacteria located at the center of the sludge. Anamox bacteria produce nitrogen gas based on ammoniacal nitrogen and nitrite nitrogen that have passed through activated sludge to remove ammoniacal nitrogen and nitrite nitrogen from intermediate wastewater.

The fungus-containing sludge is classified according to the linear velocity of the upward flow 12e passing through the inside of the column 12. Specifically, the fungus-containing sludge is classified into the retained sludge that stays inside the column 12 and the discharged sludge that is discharged from the discharge unit 12d when the upward flow 12e is formed inside the column 12. The discharged sludge is discharged to the outside of the column 12 from the discharge unit 12d together with the intermediate wastewater passing through the inside of the column 12 and is supplied to the column 13.

The discharged sludge is classified according to the linear velocity of the upward flow 13e passing through the inside of the column 13. Specifically, the discharged sludge is classified into residual sludge remaining inside the column 13 and column external sludge discharged from the discharge unit 13d when the upward flow 13e is formed inside the column 13. The column external sludge is discharged to the outside of the column 13 from the discharge unit 13d together with the intermediate drainage passing through the inside of the column 13, and is discharged to the outside of the column 13. That is, when the upward flow 12e is formed inside the column 12 and the upward flow 13e is formed inside the column 13, the fungus-containing sludge existing inside the column 12 is retained sludge, and the column 13 has. The fungus-containing sludge existing inside is residual sludge.

Since the fungus-containing sludge is classified by the upward flow 12e and 13e, for example, the lighter the fungus-containing sludge is more likely to be discharged to the outside of the columns 12 and 13, and the heavier the fungus-containing sludge is present inside the columns 12 and 13. Cheap. Therefore, in the column 12, the specific density of the retained sludge is larger than the specific density of the discharged sludge, and in the column 13, the specific density of the residual sludge is larger than the specific gravity of the external sludge of the column. Since the specific gravity of the fungus-containing sludge is usually determined by the amount of activated sludge containing anamox bacteria, in most cases, the amount of activated sludge constituting the retained sludge is larger than the amount of activated sludge constituting the discharged sludge and remains. The amount of activated sludge that constitutes sludge is larger than the amount of activated sludge that constitutes column external sludge.

Generally, anamox bacteria are inactivated by exposure to high concentrations of nitrite, eg, 20 mg-N / L or more of nitrite. However, even if a high concentration of nitrite is exposed to the fungus-containing sludge containing the anamox bacteria, the anamox bacteria in the fungus-containing sludge are protected by the activated sludge and are therefore difficult to inactivate. Further, the larger the amount of activated sludge containing anamox bacteria, the more difficult it is for the anamox bacteria in the bacterium-containing sludge to be inactivated.
That is, by arranging the column 12 having the retained sludge inside and the column 13 having the residual sludge inside in the treatment tank 10a, the anamox bacteria are appropriately protected from nitrite by the activated sludge and thus inactivated. The nitrogen removal process can be performed efficiently without any problem.

In the present embodiment, the linear velocities of the upward currents 12e and 13e are controlled by the pump P1, but a control means such as a pump for independently controlling the linear velocities of the upward currents 12e and 13e is provided. You may. Further, in the present embodiment, it is assumed that the upward currents 12e and 13e have different linear velocities, and for example, the linear velocity of the upward current 12e is controlled within the range of 100 m / day or more and 1000 m / day or less. The linear velocity of the upward flow 13e should be controlled within the range of 50 m / day or more and 500 m / day or less.

When the raw water is filled in the treatment tank 10a and a certain time elapses after the air diffuser 11 and the pump P1 are driven, the intermediate wastewater is sent to the treatment tank 10b as appropriate intermediate wastewater. In the present embodiment, it is premised that the appropriate intermediate wastewater satisfies a predetermined standard, and the predetermined standard is determined based on the concentration of an inorganic nitrogen compound such as ammoniacal nitrogen and nitrite nitrogen. That is, when the ammoniacal nitrogen is reduced so that the ratio of the ammoniacal nitrogen and the nitrite nitrogen in the intermediate wastewater becomes an appropriate ratio, the intermediate wastewater satisfies a predetermined standard and is treated as an appropriate intermediate wastewater from the treatment tank 10a. Water is sent to the treatment tank 10b. The appropriate ratio can be appropriately set according to the treatment performed in the treatment tank 10b, and generally, the ratio of ammoniacal nitrogen to nitrite nitrogen is 1.5: 1 to 1: 1.5. Set in range. Considering the stable nitrogen removal treatment, a more preferable appropriate ratio is in the range of 1.5: 1 to 1: 1.

When the treatment tank 10b is filled with the proper intermediate wastewater, the pump P2 of the treatment tank 10b is driven, and the proper intermediate wastewater circulates in the treatment tank 10b. The proper intermediate wastewater has ammoniacal nitrogen and nitrite nitrogen and passes through the nitrogen removal region 14 when circulating in the treatment tank 10b. The nitrogen removal region 14 has, for example, a carrier to which anamox bacteria are attached. As the carrier to which the anamox bacterium is attached, for example, a resin molded product, activated carbon, a non-woven fabric, or the like is used. In the nitrogen removal region 14, the anamox bacteria produce nitrogen gas according to the anamox reaction (Equation 1) based on the ammoniacal nitrogen and the nitrite nitrogen contained in the proper intermediate wastewater. Nitrogen gas is released from the proper intermediate effluent, so that ammoniacal nitrogen and nitrite nitrogen are removed from the proper intermediate effluent.

By the way, conventionally, a plurality of information regarding intermediate wastewater, for example, pH, electrical conductivity, redox potential, temperature, and dissolved oxygen amount are automatically measured by a commercially available general-purpose sensor, and these measurement results are obtained in real time. It can be confirmed at, and its reliability is high. On the other hand, other information about intermediate effluents, such as inorganic nitrogen compound concentrations such as ammoniacal nitrogen concentration, nitrite nitrogen concentration, or nitrate nitrogen concentration, must be used with expensive and maintenance-intensive sensors. Must be. Therefore, the concentrations of these inorganic nitrogen compounds cannot be confirmed in real time, and can be confirmed gradually by the administrator of the wastewater treatment apparatus manually measuring the concentrations on a regular basis such as daily or weekly. Then, it is not easy to control the ratio of ammoniacal nitrogen and nitrite nitrogen in the proper intermediate wastewater to the proper ratio.

In the following, the relationship between the concentration of inorganic nitrogen compounds manually measured by the manager of the wastewater treatment equipment and each information related to intermediate wastewater such as pH and electrical conductivity automatically measured by a general-purpose sensor will be determined in the future. A mechanism for predicting the concentration of an inorganic nitrogen compound for a short period of time, for example, one month or one week ahead, and easily controlling the ratio of ammoniacal nitrogen to nitrite nitrogen in the intermediate wastewater will be described.

FIG. 2 is a block diagram schematically showing a configuration of an information processing device 20 used for investigating the relationship of a plurality of information obtained from waste water treated using the waste water treatment device 10 of FIG. 1.

The information processing device 20 of FIG. 2 includes a CPU 21 (acquisition means, derivation means, calculation means, control means), RAM 22, ROM 23, HDD 24, and data input unit 25, which are connected to each other via an internal bus 26. There is. The CPU 21 expands the program stored in the ROM 23 or the HDD 24 into the RAM 22 which is the work memory of the CPU 21 and executes the program. Further, a plurality of information regarding the intermediate wastewater, for example, measured values of ammoniacal nitrogen concentration, nitrite nitrogen concentration, pH, electrical conductivity, oxidation-reduction potential, temperature, and dissolved oxygen amount are input from the data input unit 25. It is stored in the ROM 23 or the HDD 24. The CPU 21 executes multiple regression analysis using the measured values of each information regarding the intermediate drainage stored in the HDD 24, and derives a regression equation (relational expression) that predicts any of the information using the other information.

FIG. 3 is a flowchart showing a procedure of the regression equation derivation process executed by the information processing apparatus 20 of FIG. In the present embodiment, the CPU 21 executes the multiple regression analysis in advance using the measured values of each information regarding the intermediate wastewater. By the way, the concentration difference value ΔN obtained by simply subtracting the concentration of nitrite nitrogen from the concentration of ammoniacal nitrogen in the intermediate wastewater is set as the objective variable to be predicted, and the pH and electrical conductivity of the intermediate wastewater are causally related to the objective variable. The function used as an explanatory variable is not derived as a linear relationship (linear function) because the electrical conductivity used for the explanatory variable is strongly influenced by all the ions contained in the intermediate wastewater and fluctuates drastically. On the other hand, the function obtained from the concentration difference value ΔN based on the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen in the intermediate wastewater constituting the appropriate ratio and the pH and electrical conductivity of the intermediate wastewater is a linear function. It was experimentally confirmed that they were similar. Therefore, it is premised that the regression equation derivation process of FIG. 3 is executed to obtain a regression equation having the concentration difference value ΔN as the objective variable and pH and electrical conductivity as the explanatory variables for the intermediate wastewater constituting the appropriate ratio. And.

In FIG. 3, first, it is composed of the concentration of ammoniacal nitrogen, the concentration of nitrite nitrogen, pH (first information), and electrical conductivity (second information) of the intermediate wastewater collected at the same timing. _{Relationship verification data D 1} (see, for example, Table 1) having a plurality of set data (information groups) is stored in the HDD 24. CPU21 refers to the relationship verification data D ₁ (S31, acquisition step), to calculate the density difference ΔN by subtracting the concentration of nitrite nitrogen from the concentration of ammonium nitrogen per set data (S32), calculates _{New relationship verification data D 2} (see, for example, Table 2) having a plurality of set data composed of the obtained concentration difference values ΔN, pH, and electrical conductivity is acquired (S33).

Then, CPU 21 performs a multiple regression analysis using the new relationship verification data D ₂ (S34), the regression equation for the and pH and conductivity as the objective variable and the explanatory variable density difference .DELTA.N (formula 2) is derived (S35, derivation step), and this process is completed.

Concentration difference value ΔN = coefficient β ₀ + coefficient β ₁ × electrical conductivity + coefficient β ₂ × pH ・ ・ ・ (Equation 2)

_{In the present embodiment, for example, the relationship verification data D 1} (hereinafter, the relationship verification data D ₁₎ composed of a plurality of set data collected in 190 days before the day when the multiple regression analysis is executed is referred to as “relationship verification”. Data D _{190 ”), or relationship verification data D 1} consisting of a plurality of set data collected 90 days before the day when the multiple regression analysis was performed (hereinafter, the relationship verification data D _{1 is referred} to as“ relationship ”. The regression equation of Equation 2 above was derived using the verification data D _{90 ”).}

When the CPU 21 _{derives the regression equation of the above equation 2 using the relationship verification data D 190} and D ₉₀ , the coefficient of determination of each regression equation of the derived equation 2 is 0.84 and 0.94, respectively. rice field. In addition, the concentration difference value Δ calculated using the respective values of the ammoniacal nitrogen concentration and the nitrite nitrogen concentration among the set data constituting the relationship verification data D ₁₉₀ and D _{90 (hereinafter, “actual measurement difference”).} The concentration difference value Δ (referred to as the value Δ _m ”) and the concentration difference value Δ (referred to from each regression equation of the above equation 2) using pH and electrical conductivity of the set data constituting the relationship verification data D ₁₉₀ and D _90. hereinafter, the called.) "calculated difference value delta _C", the absolute value of the error of, 30 mg-N / L or less, respectively, was equal to or less than 20 mg-N / L.

That is, the regression equation of the above equation 2 for the and pH and conductivity as the objective variable and the explanatory variable density difference ΔN has a high coefficient of determination, also the absolute error of the measured difference value delta _m and the calculated difference value delta _C The value is also small. Therefore, it was found that the calculated difference value delta _C calculated from the regression equation of the above formula 2 may be used as a value indicating the measured difference value delta _m.

Further, the coefficient of determination of the regression equation derived using the relationship verification data D ₉₀ is higher than the coefficient of determination of the regression equation derived using _{the other relationship verification data D 190, and the relationship verification data} absolute value of the error of the measured difference value delta _m and the calculated difference value delta _C based on D _90, rather than the absolute value of the error of the measured difference value delta _m and the calculated difference value delta _C based on other relevant verification data D ₁₉₀ small. Thus, for example, pH and electric conductivity of the intermediate effluent calculated difference value delta _C is specific date and time, and, when it is calculated using the regression equation above equation 2, the regression equation of the equation 2 is the particular time and date timing not far from, for example, it was found that it is preferable are derived based on the relationship verification data D ₁ relates to an intermediate drainage within March from that particular time.

FIG. 4 is a flowchart showing a procedure of control processing executed by the CPU 21 in FIG.

The control process of FIG. 4 is executed to control the ratio of the ammoniacal nitrogen concentration and the nitrite nitrogen concentration of the intermediate wastewater to an appropriate ratio. In the following, the procedure of the control process executed when controlling the ratio of the ammonia nitrogen concentration and the nitrite nitrogen concentration of the intermediate wastewater to 1: 1 will be described, and it will be derived using the _{relationship verification data D 90.} It is assumed that the regression equation of the above equation 2 is stored in the HDD 24.

In FIG. 4, the CPU 21 first receives an instruction regarding a date on which the concentration difference value ΔN should be calculated based on the regression equation of the above equation 2 (hereinafter referred to as “ΔN calculation date”) (S41), and inputs data. The values of pH (third information) and electrical conductivity (fourth information) collected on the ΔN calculation date input from the unit 25 are stored in the HDD 24 (S42).

Next, the CPU 21 calculates the concentration difference value ΔN using the regression equation stored in the HDD 24 and the values of pH and electrical conductivity collected on the ΔN calculation date (S43, calculation step). Subsequently, the CPU 21 determines whether or not the calculated concentration difference value ΔN is within a predetermined range (S44). The concentration difference value ΔN may be, for example, -100 mg-N / L or more and 100 mg-N / L or less, but here, the concentration difference value ΔN is a regression equation derived using the _{relationship verification data D 90.} Since it is calculated based on the above, the CPU 21 determines whether the calculated concentration difference value ΔN is −20 mg-N / L or more and 20 mg-N / L or less.

As a result of the determination in S44, the CPU 21 assumes that the ratio of the ammoniacal nitrogen concentration and the nitrite nitrogen concentration in the intermediate wastewater is 1: 1 when the calculated concentration difference value ΔN is within a predetermined range. When the amount of air supplied from the air diffuser 11 is maintained (S45) and this process is completed and the calculated concentration difference value ΔN is not within a predetermined range, the calculated concentration difference value ΔN is a predetermined value. It is determined whether or not it is less than the lower limit of the range (S46).

As a result of the determination in S46, when the calculated concentration difference value ΔN is less than the lower limit of the predetermined range, the CPU 21 reduces the amount of air supplied from the air diffuser 11 and returns to (S47) S44 for calculation. When the concentration difference value ΔN is not less than the lower limit of the predetermined range, it is determined that the calculated concentration difference value ΔN exceeds the upper limit of the predetermined range (S48), and the air supplied from the air diffuser 11 is supplied. (S49) and return to S44.

According to the control process of FIG. 4, _{the regression equation of the above equation 2 derived using the relationship verification data D 90} is stored in the HDD 24 in advance, and the regression equation of the above equation 2 and the ΔN calculation date are collected. The concentration difference value ΔN is calculated using the values of pH and electrical conductivity (S43), and it is determined whether or not the concentration difference value ΔN is within a predetermined range (S44). As a result, when the concentration difference value ΔN is within a predetermined range (YES in S44), the concentration difference value ΔN is approximately 0 mg-N / L, and the ammonia nitrogen concentration and the nitrite nitrogen concentration of the intermediate wastewater. It is evaluated that the ratio with and is 1: 1 and the amount of air supplied from the air diffuser 11 is maintained (S45).

On the other hand, when the concentration difference value ΔN is not within a predetermined range (NO in S44), it is determined whether or not the concentration difference value ΔN is less than the lower limit of the predetermined range (S46). When the concentration difference value ΔN is less than the lower limit of the predetermined range, the concentration of nitrite nitrogen is evaluated to be higher than the concentration of ammoniacal nitrogen, and the amount of air supplied from the air diffuser 11 is reduced (S47). ). On the other hand, when the concentration difference value ΔN is not less than the lower limit of the predetermined range, it is determined that the concentration difference value ΔN exceeds the upper limit of the predetermined range (S48), and the concentration of nitrite nitrogen is that of ammoniacal nitrogen. It is evaluated to be lower than the concentration, and the amount of air supplied from the air diffuser 11 is increased (S49).

Therefore, the amount of air supplied from the air diffuser 11 is adjusted according to the concentration difference value ΔN, and the concentration of nitrite nitrogen is controlled (S44 to S49, control step). As a result, the ratio of the ammonia nitrogen concentration and the nitrite nitrogen concentration of the intermediate wastewater is controlled to 1: 1 so that the ratio of the ammonia nitrogen and the nitrite nitrogen contained in the waste water is automatically controlled. Can be done.

The concentration difference value ΔN is calculated using the regression equation and the pH and electrical conductivity values collected on the ΔN calculation date (S43). Since the values of pH and electrical conductivity are easily measured, if the regression equation is stored in the HDD 24 in advance, the concentration difference value ΔN related to the measured pH and electrical conductivity can be easily and quickly grasped. .. Therefore, the concentration difference value ΔN can be easily grasped without using a measuring instrument for measuring the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen. As a result, the frequency of calibrating each measuring instrument can be reduced, and thus the burden of maintenance of each measuring instrument can be reduced.

The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device read the program. It can also be realized by the processing to be executed, and it can also be realized by the circuit that realizes one or more functions.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

10 Wastewater treatment device 10a, 10b Treatment tank 11 Air diffuser 20 Information processing device 21 CPU21

Claims (10)

An information processing device used for wastewater treatment that removes ammoniacal nitrogen and nitrite nitrogen contained in wastewater from the wastewater.
Relationship verification data having a plurality of information groups including the concentration of the ammoniacal nitrogen, the concentration of the nitrite nitrogen, the first information, and the second information collected at the same timing as the wastewater information. The acquisition method to acquire and
The difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen, and the relational expression showing the relationship between the first information and the second information are derived by using the relationship verification data. Derivation means and
The third information used as the first information constituting the relational expression and the fourth information used as the second information constituting the relational expression are acquired, and the third information and the fourth information are acquired. A calculation means for calculating the difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen related to the information of the above using the relational expression.
An information processing apparatus comprising: a control means for controlling the concentration of the nitrite nitrogen according to the calculated difference value. The wastewater treatment is carried out by supplying air to the wastewater, and the concentration of the nitrite nitrogen is controlled by adjusting the amount of air supplied to the wastewater. 1. The information processing apparatus according to 1. The information processing apparatus according to claim 1 or 2, wherein when the calculated difference value is a value in a predetermined range, the control means maintains the amount of air supplied to the wastewater. When the calculated difference value is larger than the upper limit value of the predetermined range, the control means increases the amount of air supplied to the wastewater, and when the calculated difference value is smaller than the lower limit value of the predetermined range. The information processing apparatus according to any one of claims 1 to 3, wherein the control means reduces the amount of air supplied to the wastewater. The difference value is a value obtained by subtracting the concentration of the nitrite nitrogen from the concentration of the ammoniacal nitrogen, and the predetermined range is ± 100 mg-N / L according to claim 3 or 4. Information processing equipment. The information processing apparatus according to any one of claims 1 to 5, wherein the relational expression is derived by performing multiple regression analysis using the relational verification data. The information processing apparatus according to any one of claims 1 to 6, wherein the relational expression has a difference value between the concentration of ammoniacal nitrogen and the concentration of nitrite nitrogen as an objective variable. Claims 1 to 1, wherein the first information and the third information are values of the pH of the wastewater, and the second information and the fourth information are the electrical conductivity of the wastewater. The information processing apparatus according to any one of 7. An information processing method used for wastewater treatment for removing ammoniacal nitrogen and nitrite nitrogen contained in wastewater from the wastewater.
Relationship verification data having a plurality of information groups including the concentration of the ammoniacal nitrogen, the concentration of the nitrite nitrogen, the first information, and the second information collected at the same timing as the wastewater information. Get step to get and get
The difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen, and the relational expression showing the relationship between the first information and the second information are derived by using the relationship verification data. Derivation step and
After acquiring the relationship verification data, the third information used as the first information constituting the relational expression and the fourth information used as the second information constituting the relational expression are acquired. A calculation step of calculating the difference between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen related to the third information and the fourth information using the relational expression.
An information processing method comprising: a control step for controlling the concentration of the nitrite nitrogen according to the calculated difference value. A program that causes a computer to execute an information processing method used for wastewater treatment that removes ammoniacal nitrogen and nitrite nitrogen contained in wastewater from the wastewater.
The information processing method is
Relationship verification data having a plurality of information groups including the concentration of the ammoniacal nitrogen, the concentration of the nitrite nitrogen, the first information, and the second information collected at the same timing as the wastewater information. Get step to get and get
The difference value between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen, and the relational expression showing the relationship between the first information and the second information are derived by using the relationship verification data. Derivation step and
After acquiring the relationship verification data, the third information used as the first information constituting the relational expression and the fourth information used as the second information constituting the relational expression are acquired. A calculation step of calculating the difference between the concentration of the ammoniacal nitrogen and the concentration of the nitrite nitrogen related to the third information and the fourth information using the relational expression.
A program comprising: a control step for controlling the concentration of the nitrite nitrogen according to the calculated difference value.

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