JP2017113725A - Operation support system and operation support method of sewage treatment plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation support system and an operation support method of a sewage treatment plant which stably maintain excellent water quality and can reduce an aeration air quantity.SOLUTION: A water treatment facility 10 includes a flow meter 41 that measures an amount of sewage flowing in a water treatment facility 10, a COD concentration meter 142 and an ammonia nitrogen concentration meter 143 that measure water quality of sewage flowing in reactors 112 and 212, and MLSS meters 145 and 245 and dissolved oxygen concentration meters 146 and 246 for measuring water quality of reactor tank aerobic tanks 114 and 214, in which means 121 for calculating an oxygen amount necessary for removing an organic material and nitrogen contained in the sewage flowing in the reactor tank based on measurements by the flow meter 41 and the concentration meter, and means for feed-back adjusting the oxygen amount based on a deviation of a target value of the dissolved oxygen concentration and a measurement value of the dissolved oxygen concentration after determining in advance a target value of the dissolved oxygen concentration necessary for satisfying the target value of the ammonia nitrogen concentration in the reactor tank aerobic tank.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an operation support apparatus and an operation support method for a sewage treatment plant.

  A conventional operation support device for a sewage treatment plant will be described with reference to FIG. The water treatment facility 10 in the sewage treatment plant is divided into two series, series 1 and series 2. Since series 1 and series 2 have the same configuration, only the configuration of series 1 will be described in detail. The series 1 includes a first sedimentation tank 111, a reaction tank 112, and a final sedimentation tank 115, and sewage is settled and removed in the first sedimentation tank 111 by relatively coarse suspended matters. In the reaction tank 112, sewage is mixed with activated sludge and aerated by air sent from the aeration apparatus 116 via the aeration apparatus 117, and organic substances are removed by the metabolic action of microorganisms contained in the activated sludge. The activated sludge mixed liquid is purified in the final sedimentation basin 115 as the activated sludge settles.

  In order to remove nitrogen from the sewage, the reaction tank 112 is divided into a part that performs aeration (hereinafter referred to as an aerobic tank) and a part that does not perform aeration (hereinafter referred to as an oxygen-free tank). Nitrogen compounds such as ammonia are oxidized to nitric acid (hereinafter referred to as nitrification reaction). The nitric acid produced in the aerobic tank 114 is sent from the aerobic tank 114 to the anoxic tank 113 through the return sludge. In the anoxic tank 113, as a result of nitric acid respiration of the activated sludge, it becomes nitrogen gas and is removed to the atmosphere. .

  FIG. 14 is a block diagram showing a signal flow in FIG. Based on the deviation between the measured value of the DO meter 146 that measures the dissolved oxygen concentration (hereinafter referred to as DO) installed in the aerobic tank 114 and the DO set value set in the parameter setting unit 122 by the operator, the DO controller 128 Calculate the required aeration volume. The aeration air volume control device 130 uses the aeration air volume calculated by the DO controller 128 as a target value, and controls the aeration apparatus 116 so that the aeration air volume matches this (hereinafter referred to as DO control).

  In FIG. 13, a return line having a return sludge pump 119 is provided between the final sedimentation tank 115 and the reaction tank 112.

  An operation support apparatus for a sewage treatment plant shown in FIG. 15 is described in JP 2012-135717 A.

  The water treatment facility 10 in the sewage treatment plant is divided into two series, series 1 and series 2. Since series 1 and series 2 have the same configuration, only the configuration of series 1 will be described in detail. Series 1 includes a flow meter 141, a COD concentration meter 142, an ammonia nitrogen concentration meter 143 in the water channel into which the sewage flows, an MLSS meter 145, a DO meter 146, and an ammonia nitrogen concentration meter 147 in the reaction tank. A nitrate nitrogen concentration meter 148 and a water temperature meter 149 are installed.

  FIG. 16 is a block diagram showing a signal flow in FIG. Based on the measured values of the flow meter and the concentration meter and various parameters set by the operator in the parameter setting unit 122, the required oxygen amount calculation unit 123 removes organic substances and nitrogen contained in the sewage flowing into the reaction tank. After calculating the required amount of oxygen, the feedback calculation unit 124 performs feedback adjustment of the required oxygen amount based on the deviation between the target value of the reaction tank aerobic tank ammonia nitrogen concentration and the measurement value of the ammonia nitrogen concentration meter 147. Based on the calculated oxygen amount and the performance curve of the diffuser, the aeration air amount calculation unit 125 calculates the aeration air amount. The aeration air volume control device 130 controls the aeration apparatus 116 so that the aeration air volume coincides with the aeration air volume calculated by the aeration air volume calculation unit 125 as a target value (hereinafter referred to as OR control).

JP 2012-135717 A

  In the conventional technology, in DO control, control is performed based on the DO signal from the DO meter installed at the end of the reaction tank. As a result, the removal of organic matter and nitrogen tends to be incomplete, so it is difficult to stably maintain good treated water quality. In addition, if the operator sets the DO target value higher than necessary in consideration of these problems, the amount of energy required for aeration may be excessive with respect to the amount of energy originally required. The cost required for this will increase.

  Furthermore, since the optimal DO target value at a certain point in time is not known, the DO target value is set based on past experience and intuition based on water quality analysis data of influent and treated water. Therefore, it is difficult to stably maintain good treated water quality, and it is necessary to make a setting with some allowance in consideration of fluctuations in the amount of incoming sewage water and the quality of the incoming water. It often becomes a thing.

  On the other hand, in the OR control, control is performed based on the amount and quality of sewage flowing into the reaction tank and the quality of the reaction tank, so that a good treated water quality can be stably maintained. In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control. However, in order to apply OR control, it is necessary to install a COD concentration meter and ammonia nitrogen concentration meter in the water channel into which sewage flows, and an ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, and water temperature meter in the reaction tank for each series. Therefore, the introduction cost and maintenance cost are higher than DO control.

  The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce a sewage treatment plant operation support apparatus and operation support method capable of stably maintaining good treated water quality and reducing the amount of aeration air. The purpose is to provide at a cost.

  The operation support device of the sewage treatment plant according to claim 1 is a water having a plurality of series by an activated sludge method including a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device. For the aeration air volume control device that controls the aeration apparatus so that the aeration air volume matches the control target value of the aeration air volume at the treatment facility, calculate the aeration air volume necessary for processing the sewage for each series. In the operation support device of the sewage treatment plant equipped with means for transferring the aerated air volume as a control target value for each series, a flow meter for measuring the amount of sewage flowing into the water treatment facility is provided, and the sewage flowing into the reaction tank is provided. At least one COD densitometer, SS densitometer, or turbidity meter that measures water quality is installed in at least one of the multiple series, and an ammonia nitrogen concentration meter that measures the quality of sewage flowing into the reaction tank is used. Installed in at least one of the series, MLSS meter and dissolved oxygen concentration meter for measuring water quality of reaction tank aerobic tank are provided for each series, and the above flow meter, COD concentration meter, SS concentration meter, turbidity meter The oxygen amount required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured value of at least one of the concentration meter, ammonia nitrogen concentration meter, MLSS meter The calculation means of 1 is provided, and the relationship between the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter, or the reaction tank aerobic tank in advance. Based on the relationship between the ammonia nitrogen concentration analysis value of the water sample and the measurement value of the dissolved oxygen concentration meter, the dissolved oxygen concentration required to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration Series target values A second calculation that feedback-adjusts the necessary oxygen amount calculated by the first calculation means based on a deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration Means is provided for each series, and third calculation means is provided for calculating the required aeration air volume for each series based on the oxygen amount calculated by the second calculation means and the performance curve of the diffuser, and third calculation means The aeration air volume calculated by the above is transferred for each series as a control target value of the aeration air volume control device.

  Here, the aeration apparatus supplies air necessary for removing organic matter and nitrogen by microorganisms, and includes a blower and an air volume adjusting valve that adjusts the amount of air supplied to the reaction tank by the blower. means. The diffuser is an apparatus that efficiently supplies oxygen to the reaction tank by miniaturizing the air supplied from the blower, and the apparatus shown in FIG. 17 is generally used.

  Further, feedback adjustment refers to performing adjustment by returning the output result to the input side.

  Concentration meters that measure inflow water quality are prone to error due to contamination, but even if the required oxygen amount calculated by the concentration meter error is too large or too small compared to the necessary oxygen amount, this feedback adjustment Thus, correction can be performed.

  In addition, this feedback adjustment functions effectively and can correct for errors caused by causes such as aged deterioration of the diffuser / aeration apparatus.

  In the operation support device configured as described above, it is necessary to remove BOD and Kjeldahl nitrogen from the amount of sewage flowing into the water treatment facility, the quality of sewage flowing into the reaction tank, and the quality of the reaction tank aerobic tank. Calculate the amount of oxygen, and in advance, the relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter, or water sampling in the reaction tank aerobic tank The target of dissolved oxygen concentration required to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the measured value of the ammonia nitrogen concentration of the sample and the measured value of the dissolved oxygen concentration meter. After the value is determined, the oxygen amount is feedback-adjusted based on a deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration. And the performance curve of the diffuser, the required aeration air volume can be calculated.By transferring this aeration air volume to the aeration air volume setting unit of the aeration air volume controller, it matches the set aeration air volume. Since the treatment of organic matter and nitrogen can be effectively performed by the aeration air volume control device controlling the aeration device, it is possible to stably maintain good treated water quality.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of the sewage flowing into the reaction tank for each series, whereas in the operation support device of the sewage treatment plant shown in claim 1, Installation of only one system is necessary, and installation of ammonia nitrogen concentration meters, nitrate nitrogen concentration meters, and water temperature meters in reaction tanks for each system, which is necessary for OR control, is unnecessary. Costs and maintenance costs can be reduced.

  The operation support device for a sewage treatment plant according to claim 2 is a water having a plurality of lines by an activated sludge method comprising a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device. For the aeration air volume control device that controls the aeration apparatus so that the aeration air volume matches the control target value of the aeration air volume at the treatment facility, calculate the aeration air volume necessary for processing the sewage for each series. In the operation support device of the sewage treatment plant equipped with means for transferring the aerated air volume as a control target value for each series, a flow meter for measuring the amount of sewage flowing into the water treatment facility is provided, and the sewage flowing into the reaction tank is provided. At least one COD densitometer, SS densitometer, or turbidimeter that measures water quality is installed in at least one of a plurality of series, and ammonia that measures the water quality in a reaction tank anaerobic tank or reaction tank anoxic tank A nitrogen concentration meter is installed in at least one of the multiple systems, and an MLSS meter and dissolved oxygen concentration meter for measuring the water quality of the reaction tank aerobic tank are installed for each series. The above flow meter, COD concentration meter, SS concentration Of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of at least one concentration meter, ammonia nitrogen concentration meter, and MLSS meter The first calculating means is provided for each calculation, the relationship between the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measured value of the dissolved oxygen concentration meter, or the reaction tank Necessary for satisfying the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the analytical value of ammonia nitrogen concentration of the sample collected in the aerobic tank and the measured value of the dissolved oxygen concentration meter. Dissolved oxygen concentration The target oxygen amount is determined for each series, and the necessary oxygen amount calculated by the first calculating means is fed back based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration. A second calculating means for adjusting is provided for each series, and a third calculating means for calculating the necessary aeration air volume for each series based on the oxygen amount calculated by the second calculating means and the performance curve of the diffuser is provided. The aeration air volume calculated by the third calculation means is transferred for each series as a control target value of the aeration air volume control device.

  In the operation support apparatus configured as described above, the amount of sewage flowing into the water treatment facility, the quality of the sewage flowing into the reaction tank, the quality of the reaction tank anaerobic tank or oxygen-free tank, and the quality of the reaction tank aerobic tank The amount of oxygen required to remove BOD and Kjeldahl nitrogen is calculated, and the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measured value of the dissolved oxygen concentration meter The target value of the reaction tank aerobic tank ammonia nitrogen concentration is calculated based on the relationship between the analysis value of the ammonia nitrogen concentration of the sample collected in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter. After determining the target value of the dissolved oxygen concentration necessary for satisfying, the oxygen amount is feedback adjusted based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration. Furthermore, since the required aeration air volume can be calculated from the feedback-adjusted oxygen amount and the performance curve of the diffuser, it is set by transferring this aeration air volume to the aeration air volume setting unit of the aeration air volume controller. Since the aeration air volume control device controls the aeration device so as to match the aeration air volume, the organic matter and nitrogen can be effectively treated, so that the quality of the treated water can be stably maintained.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of the sewage flowing into the reaction tank for each series, whereas in the operation support device of the sewage treatment plant shown in claim 2, Installation of only one system is necessary, and installation of ammonia nitrogen concentration meters, nitrate nitrogen concentration meters, and water temperature meters in reaction tanks for each system, which is necessary for OR control, is unnecessary. Costs and maintenance costs can be reduced.

  In addition, the measurement target of the ammonia nitrogen concentration meter is changed from the sewage flowing into the reaction tank to the reaction tank anaerobic tank or reaction tank anoxic tank, thereby reducing the influence of pollutants on the ammonia nitrogen concentration meter. Thus, the maintenance cost can be further reduced.

  The operation support device for a sewage treatment plant according to claim 3 is a water having a plurality of lines by an activated sludge method including a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device. For the aeration air volume control device that controls the aeration apparatus so that the aeration air volume matches the control target value of the aeration air volume at the treatment facility, calculate the aeration air volume necessary for processing the sewage for each series. In the operation support device of the sewage treatment plant provided with means for transferring the aerated air volume as a control target value for each series, a flow meter for measuring the amount of sewage flowing into the water treatment facility is provided, and the sewage flowing into the reaction tank, An ammonia nitrogen concentration meter that measures at least one of the reaction tank anaerobic tank and reaction tank anaerobic tank is installed in at least one of the multiple series to measure the water quality of the reaction tank aerobic tank. A dissolved oxygen concentration meter is provided for each series, and the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of the above flow meter and ammonia nitrogen concentration meter for each series. The first calculation means is provided for calculating the relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter, or the reaction tank preference. Necessary to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the analytical value of ammonia nitrogen concentration of the sample collected in the tank and the measured value of the dissolved oxygen concentration meter. Necessary amount of oxygen calculated by the first calculation means based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration after determining the target value of the dissolved oxygen concentration for each series Feedback A second calculating means for adjusting is provided for each series, and a third calculating means for calculating the necessary aeration air volume for each series based on the oxygen amount calculated by the second calculating means and the performance curve of the diffuser is provided. The aeration air volume calculated by the third calculation means is transferred for each series as a control target value of the aeration air volume control device.

  In the operation support device configured as described above, BOD and Kjeldahl nitrogen are obtained from at least one water quality of the amount of sewage flowing into the water treatment facility, the sewage flowing into the reaction tank, the reaction tank anaerobic tank, and the reaction tank anoxic tank. The amount of oxygen required to remove oxygen is calculated, and the relationship between the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measured value of the dissolved oxygen concentration meter, or the reaction Necessary to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the analytical value of ammonia nitrogen concentration of the sample collected in the tank aerobic tank and the measured value of the dissolved oxygen concentration meter. A target value of the dissolved oxygen concentration to be determined, and feedback adjustment of the oxygen amount based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, In addition, since the required aeration volume can be calculated from the feedback-adjusted oxygen volume and the performance curve of the diffuser, it can be set by transferring this aeration volume to the aeration volume setting unit of the aeration volume controller. Since the aeration air volume control device controls the aeration device so as to coincide with the aeration air volume, the treatment of organic matter and nitrogen can be performed effectively, so that good treated water quality can be stably maintained.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of sewage flowing into the reaction tank for each series, whereas in the operation support device of the sewage treatment plant shown in claim 3, It is only necessary to install an ammonia nitrogen concentration meter in one line, and it is not necessary to install an ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, or water temperature meter in the reaction tank for each line, which is required for OR control. Therefore, it is possible to reduce these introduction costs and maintenance costs.

  In addition, if the measurement target of the ammonia nitrogen concentration meter is a reaction tank anaerobic tank or reaction tank anoxic tank, the influence of pollutants on the ammonia nitrogen concentration meter will be reduced, and maintenance costs will be reduced. Further reduction is possible.

  The operation support device for a sewage treatment plant according to claim 4 is a water having a plurality of series by an activated sludge method including a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device. For the aeration air volume control device that controls the aeration apparatus for each series so that the aeration air volume matches the control target value of the aeration air volume at the treatment facility, the aeration air volume necessary for processing the sewage is calculated for each series. In the operation support apparatus for a sewage treatment plant provided with means for transferring the calculated aeration air volume as a control target value for each series, one of the plurality of series is designated as a representative series, and the representative series is designated as a reaction tank. At least one of a flow meter that measures the amount of sewage that flows in, a COD concentration meter that measures the quality of sewage that flows into the reaction tank, an SS concentration meter, and a turbidity meter, and the quality of sewage that flows into the reaction tank Ammo to A nitrogen concentration meter, MLSS meter that measures the water quality in the reaction tank aerobic tank, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, and water temperature meter are installed. A dissolved oxygen concentration meter for measuring the water quality of the tank is provided for each series. The representative series includes the above flow meter, COD concentration meter for measuring the quality of sewage flowing into the reaction tank, SS concentration meter, and turbidity meter. At least one concentration meter, ammonia nitrogen concentration meter, MLSS meter that measures the water quality of the reaction tank aerobic tank, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, flow into the reaction tank based on the measured value of the water temperature meter The first calculation means for calculating the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage is provided, and the target value of the ammonia nitrogen concentration in the reaction tank aerobic tank and the measured value of the ammonia nitrogen concentration The first calculation hand based on the deviation of The second calculation means for feedback adjustment of the required oxygen amount calculated by the above is provided, and the other series includes the BOD in the sewage flowing into the reaction tank based on the oxygen amount calculated by the first calculation means. A third calculation means for calculating the amount of oxygen necessary to remove Kjeldahl nitrogen for each series is provided, and the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the dissolved The reaction tank aerobic tank based on the relationship between the measured value of the oxygen concentration meter or the relationship between the ammonia nitrogen concentration analysis value of the sample collected in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter. The target value of the dissolved oxygen concentration required to satisfy the target value of the ammonia nitrogen concentration is determined for each series, and the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration is determined. System based For each column, there is provided a fourth calculation means for feedback adjustment of the required oxygen amount calculated by the third calculation means, and the oxygen amount calculated by the second calculation means and the fourth calculation means and the performance curve of the diffuser A fifth calculating means for calculating the required aeration air volume for each series based on the above, and transferring the aeration air volume calculated by the fifth calculation means for each series as a control target value of the aeration air volume control device. To do.

  In the operation support device configured in this way, in the representative series, the amount of aeration air necessary to remove BOD and Kjeldahl nitrogen from the amount of sewage water flowing into the reaction tank, the water quality, and the water quality of the reaction tank are calculated, and the reaction is performed. Based on the deviation between the target value of ammonia nitrogen concentration in the tank aerobic tank and the measured value of ammonia nitrogen concentration, the calculated required oxygen amount is feedback-adjusted, and the feedback-adjusted oxygen amount and the performance curve of the diffuser The necessary aeration air volume is calculated based on the above, and the calculated aeration air volume is transferred for each series as the control target value of the aeration air volume control device.In other series, the aeration air volume of the sewage flowing into the reaction tank calculated in the representative series is transferred. Based on the amount of oxygen required to remove BOD and Kjeldahl nitrogen, the acid needed to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank for each series The amount was calculated in advance, the relationship between the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter, or water was collected in the reaction tank aerobic tank Based on the relationship between the ammonia nitrogen concentration analysis value of the sample and the measured value of the dissolved oxygen concentration meter, the target value of the dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration Is determined for each series, and based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, the calculated required oxygen amount is feedback-adjusted, and the oxygen amount after feedback The required aeration air volume is calculated for each series based on the performance curve of the diffuser, and the calculated aeration air volume is transferred as a control target value for the aeration air volume control apparatus for each series, thus matching the set aeration air volume. Yo Aeration amount control device it is possible to effectively carry out the processing of organic matter and nitrogen by controlling the aeration device, it is possible to maintain a good quality of treated water stably in.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to install a COD meter and an ammonia nitrogen concentration meter that measure the quality of the sewage flowing into the reaction tank for each series, whereas in the operation support device of the sewage treatment plant shown in claim 4, the COD It is only necessary to install the concentration meter and the ammonia nitrogen concentration meter only in the representative series, and it is possible to reduce the introduction cost and the maintenance cost.

In addition, installation of nitrate nitrogen concentration meters, ammonia nitrogen concentration meters, and water temperature meters in reaction tanks other than the representative series, which is required for OR control, is no longer necessary, reducing installation costs and maintenance costs. It becomes possible to do.

  The operation support method for a sewage treatment plant according to claim 5 is an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple series. Measure the amount of sewage water to flow with a flow meter, measure the quality of the sewage water flowing into the reaction tank with at least one of the COD concentration meter, SS concentration meter, and turbidity meter in at least one of the series. The quality of sewage flowing into the tank is measured with at least one of the multiple series using an ammonia nitrogen concentration meter, and the water quality of the reaction tank aerobic tank is measured for each series with an MLSS meter and dissolved oxygen concentration meter. Based on the measured values of at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter, ammonia nitrogen concentration meter, MLSS meter, BOD and Kel in the sewage flowing into the reaction tank Calculate the amount of oxygen required to remove dart nitrogen for each series, and in advance, the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter The target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the analysis value of the ammonia nitrogen concentration of the sample collected in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter The target value of the dissolved oxygen concentration required to satisfy the conditions is determined for each series, and the necessary oxygen amount calculated based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration is fed back After adjustment, the required aeration air volume is calculated for each series based on the oxygen amount after feedback adjustment and the performance curve of the diffuser.

  In the operation support method configured as described above, it is necessary to remove BOD and Kjeldahl nitrogen from the amount of sewage flowing into the water treatment facility, the quality of the sewage flowing into the reaction tank, and the quality of the reaction tank aerobic tank. Calculate the amount of oxygen, and in advance, the relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter, or water sampling in the reaction tank aerobic tank The target of dissolved oxygen concentration required to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the measured value of the ammonia nitrogen concentration of the sample and the measured value of the dissolved oxygen concentration meter. After the value is determined, the oxygen amount is feedback-adjusted based on a deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration. And since it is possible to calculate the aeration amount required from the performance curve of the diffuser, since it is possible to perform the processing of organic matter and nitrogen effectively, it is possible to maintain good quality of treated water stably.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of sewage flowing into the reaction tank for each series, whereas in the operation support method of the sewage treatment plant shown in claim 5, Installation of only one system is necessary, and installation of ammonia nitrogen concentration meters, nitrate nitrogen concentration meters, and water temperature meters in reaction tanks for each system, which is necessary for OR control, is unnecessary. Costs and maintenance costs can be reduced.

  The operation support method for a sewage treatment plant according to claim 6 is an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple series. Measure the amount of sewage water to flow with a flow meter, measure the quality of the sewage water flowing into the reaction tank with at least one of the COD concentration meter, SS concentration meter, and turbidity meter in at least one of the series. Water quality in tank anaerobic tank or reaction tank anaerobic tank is measured by ammonia nitrogen concentration meter in at least one of the multiple series, and water quality in reaction tank aerobic tank is measured by series using MLSS meter and dissolved oxygen concentration meter. And flow into the reaction tank based on the measured value of at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter, ammonia nitrogen concentration meter, MLSS meter Calculate the amount of oxygen necessary to remove BOD and Kjeldahl nitrogen in the sewage for each series, and measure the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the dissolved oxygen concentration Based on the relationship between the measured value of the meter or the analysis value of the ammonia nitrogen concentration of the sample collected in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter The target value of the dissolved oxygen concentration required to satisfy the target value of the nitrogen concentration is determined for each series, and calculated based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration In addition, the amount of necessary aeration air is calculated for each series on the basis of the amount of oxygen after the feedback adjustment and the performance curve of the air diffuser, after adjusting the amount of oxygen in a feedback manner.

  In the operation support method thus configured, the amount of sewage flowing into the water treatment facility, the quality of the sewage flowing into the reaction tank, the quality of the reaction tank anaerobic tank or reaction tank anoxic tank, the reaction tank aerobic tank Calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen from the water quality, and measure the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter The target of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the analysis value of the ammonia nitrogen concentration of the sample collected in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter After determining the target value of the dissolved oxygen concentration necessary to satisfy the value, the oxygen amount is fed back based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration. In addition, since the necessary aeration air volume can be calculated from the feedback-adjusted oxygen amount and the performance curve of the air diffuser, it is possible to effectively perform the treatment of organic matter and nitrogen. The treated water quality can be kept stable.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of sewage flowing into the reaction tank for each series, whereas in the operation support method of the sewage treatment plant shown in claim 6, Installation of only one system is necessary, and installation of ammonia nitrogen concentration meters, nitrate nitrogen concentration meters, and water temperature meters in reaction tanks for each system, which is necessary for OR control, is unnecessary. Costs and maintenance costs can be reduced.

  In addition, the measurement target of the ammonia nitrogen concentration meter is changed from the sewage flowing into the reaction tank to the reaction tank anaerobic tank or reaction tank anoxic tank, thereby reducing the influence of pollutants on the ammonia nitrogen concentration meter. Thus, the maintenance cost can be further reduced.

  The operation support method for a sewage treatment plant according to claim 7 is an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple series. Measure the amount of sewage water using a flow meter, and at least one of the sewage flowing into the reaction tank, the reaction tank anaerobic tank, and the reaction tank anaerobic tank using an ammonia nitrogen concentration meter Measure the water quality of the reaction tank aerobic tank for each series with the dissolved oxygen concentration meter, and the BOD and Kjeldahl in the sewage flowing into the reaction tank based on the measured values of the above flow meter and ammonia nitrogen concentration meter Calculate the amount of oxygen necessary to remove nitrogen for each series, and measure the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the dissolved acid The reaction tank aerobic tank based on the relationship between the measured value of the element concentration meter or the analysis value of the ammonia nitrogen concentration of the sample collected in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter The target value of the dissolved oxygen concentration required to satisfy the target value of the ammonia nitrogen concentration is determined for each series, and is calculated based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration. After the necessary oxygen amount is feedback-adjusted, the necessary aeration air amount is calculated for each series based on the oxygen amount after the feedback adjustment and the performance curve of the diffuser.

  In the operation support method configured as described above, BOD and Kjeldahl nitrogen are obtained from at least one water quality of the amount of sewage flowing into the water treatment facility, the sewage flowing into the reaction tank, the reaction tank anaerobic tank, and the reaction tank anoxic tank. The amount of oxygen required to remove oxygen is calculated, and the relationship between the measured value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measured value of the dissolved oxygen concentration meter, or the reaction Necessary to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the analytical value of ammonia nitrogen concentration of the sample collected in the tank aerobic tank and the measured value of the dissolved oxygen concentration meter. A target value of the dissolved oxygen concentration to be determined, and feedback adjustment of the oxygen amount based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, In addition, since the required aeration air volume can be calculated from the feedback-adjusted oxygen amount and the performance curve of the diffuser, it is possible to effectively treat organic matter and nitrogen, so that the quality of the treated water is stable. Can be kept.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of sewage flowing into the reaction tank for each series, whereas in the operation support method of the sewage treatment plant shown in claim 7, It is only necessary to install an ammonia nitrogen concentration meter in one series, and there is no need to install a nitrate nitrogen concentration meter, ammonia nitrogen concentration meter, or water temperature meter in the reaction tank for each series, which is required for OR control. Therefore, it is possible to reduce these introduction costs and maintenance costs.

  In addition, if the measurement target of the ammonia nitrogen concentration meter is a reaction tank anaerobic tank or reaction tank anoxic tank, the influence of pollutants on the ammonia nitrogen concentration meter will be reduced, and maintenance costs will be reduced. Further reduction is possible.

  The operation support method of the sewage treatment plant shown in claim 8, in the operation support method of the sewage treatment plant that calculates the aeration air amount required to treat sewage in a water treatment facility having a plurality of sequences, One series is a representative series. In the representative series, the amount of sewage flowing into the reaction tank is measured with a flow meter, the quality of the sewage flowing into the reaction tank is measured with an ammonia nitrogen concentration meter, and the reaction tank is an aerobic tank. Water quality is measured with an MLSS meter, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, and water temperature meter, and in other systems, the water quality of the reaction tank aerobic tank is measured for each series with a dissolved oxygen concentration meter. In the representative series, at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter to measure the quality of sewage flowing into the reaction tank, ammonia nitrogen concentration meter, reaction tank Necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of MLSS meter, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, and water temperature meter that measure water quality in the aerobic tank Calculate the amount of oxygen, feedback adjust the necessary amount of oxygen calculated based on the deviation between the target value of ammonia nitrogen concentration in the reaction tank aerobic tank and the measured value of ammonia nitrogen concentration, Necessary aeration air volume is calculated based on the performance curve of the diffuser, and in the other series, the oxygen quantity required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank calculated in the representative series is calculated. Based on this, the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank for each series is calculated, and the ammonia installed temporarily in the reaction tank aerobic tank in advance. Relationship between the measured value of the near nitrogen concentration meter and the measured value of the dissolved oxygen concentration meter, or the analysis value of ammonia nitrogen concentration of the sample collected in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter The target value of the dissolved oxygen concentration required to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series, and the target value of the dissolved oxygen concentration Based on the deviation from the measured value of the dissolved oxygen concentration, the calculated required oxygen amount is feedback adjusted, and the necessary aeration air volume is calculated for each series based on the oxygen amount after feedback and the performance curve of the diffuser. It is characterized by doing.

  In the operation support method configured in this way, the representative system calculates the amount of aeration air necessary to remove BOD and Kjeldahl nitrogen from the amount of sewage flowing into the reaction tank, the quality of the sewage, and the quality of the reaction tank. Based on the deviation between the target value of ammonia nitrogen concentration in the tank aerobic tank and the measured value of ammonia nitrogen concentration, the calculated required oxygen amount is feedback-adjusted, and the feedback-adjusted oxygen amount and the performance curve of the diffuser In order to remove BOD and Kjeldahl nitrogen for each series based on the amount of oxygen required to remove BOD and Kjeldahl nitrogen calculated in the representative series. The necessary oxygen amount is calculated, and the calculated required oxygen amount is feedback-adjusted based on the deviation between the target value of dissolved oxygen concentration and the measured value of dissolved oxygen concentration. By calculating the required aeration air volume for each series based on the oxygen amount after drubbing and the performance curve of the diffuser, it is possible to effectively treat organic matter and nitrogen. Can keep.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of sewage flowing into the reaction tank for each series, whereas in the operation support method of the sewage treatment plant shown in claim 8, The COD concentration meter and the ammonia nitrogen concentration meter need only be installed in the representative series, and it is possible to reduce the introduction cost and the maintenance cost.

  In addition, the installation of nitrate nitrogen concentration meters, ammonia nitrogen concentration meters, and water temperature meters in reaction tanks other than the representative series, which are required for OR control, is no longer necessary, reducing installation costs and maintenance costs. It becomes possible.

  FIG. 23 shows the analysis value of ammonia nitrogen concentration in the final sedimentation basin treated water in series 1 using the operation support apparatus shown in FIG. 1 configured according to the present invention, and the series using the operation support apparatus shown in FIG. 2 is a comparison diagram of measured values by an ammonia nitrogen concentration meter at a reaction tank end in FIG. The ammonia nitrogen concentration at the end of the reaction tank used to determine the target value of dissolved oxygen at the end of the reaction tank in Series 1 and the ammonia nitrogen concentration at the end of the reaction tank targeted in Series 2 are both 0.5 mg / L. It is. Here, the series 1 and the series 2 are completely different from the shape of the reaction tank and the type of the diffuser. The maximum daily nitrogenous ammonia concentration was 0.7 mg / L for Series 1 and 0.8 mg / L for Series 2. From this, it was proved that a good quality of treated water can be achieved by using the driving support device constructed according to the present invention.

  As described above, according to the present invention, the amount of sewage flowing into a water treatment facility, the quality of sewage flowing into a reaction tank, the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen from the quality of a reaction tank aerobic tank The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank and the measurement value of the dissolved oxygen concentration meter, or the sample collected in the reaction tank aerobic tank in advance Based on the relationship between the analysis value of the ammonia nitrogen concentration of the sample and the measured value of the dissolved oxygen concentration meter, the target value of the dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is calculated. After the determination, the oxygen amount is feedback-adjusted based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, and the feedback-adjusted oxygen amount and the characteristics of the diffuser Since the necessary aeration air volume can be calculated from the curve, the aeration air volume control device transfers the aeration air volume to the aeration air volume setting unit of the aeration air volume control device so that it matches the set aeration air volume. Since the organic substance and nitrogen can be effectively treated by controlling the apparatus, it is possible to stably maintain good treated water quality.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, in the OR control, it is necessary to provide a COD concentration meter and an ammonia nitrogen concentration meter that measure the quality of the sewage flowing into the reaction tank for each series, whereas in the operation support device of the sewage treatment plant shown in claim 1, Installation of only one system is necessary, and installation of ammonia nitrogen concentration meters, nitrate nitrogen concentration meters, and water temperature meters in reaction tanks for each system, which is necessary for OR control, is unnecessary. Costs and maintenance costs can be reduced.

Schematic showing the first embodiment of the present invention Schematic showing a state in which an ammonia nitrogen concentration meter is temporarily installed in the first embodiment of the present invention Block diagram showing signal flow in Figure 1 Schematic showing the second embodiment of the present invention Schematic showing a state in which an ammonia nitrogen concentration meter is temporarily installed in the second embodiment of the present invention Block diagram showing signal flow in FIG. Schematic showing the third embodiment of the present invention Schematic showing a state in which an ammonia nitrogen concentration meter is temporarily installed in the third embodiment of the present invention Block diagram showing signal flow in FIG. Schematic showing the fourth embodiment of the present invention Schematic showing a state in which an ammonia nitrogen concentration meter is temporarily installed in the fourth embodiment of the present invention Block diagram showing signal flow in FIG. Diagram showing a conventional driving support device (DO control) Block diagram showing signal flow in FIG. Diagram showing a conventional driving support device (OR control) Block diagram showing signal flow in FIG. Examples of efficiency of various diffusers Examples of performance curves for diffusers Diagram showing an example of the correlation between the COD densitometer measurement value and the BOD analysis value Figure showing an example of correlation between ammonia nitrogen concentration meter measurement value and Kjeldahl nitrogen analysis value Diagram showing the relationship between DO and ammoniacal nitrogen concentration Diagram showing the relationship between ammonia nitrogen concentration and BOD concentration of sewage flowing into the reaction tank Comparison chart of ammonia nitrogen concentration in treated water

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of the present invention.

  In FIG. 1, the water treatment facility 10 in the sewage treatment plant is divided into two series, series 1 and series 2. The configuration is the same except for the presence or absence of a densitometer that measures the quality of the sewage that flows into the reaction tank, so the detailed configuration will be explained for Series 1, and only the parts that are different from Series 1 will be explained. explain. Series 1 includes a first settling basin 111 into which sewage flows, a reaction tank 112, and a final settling basin 115. An aeration device 117 is installed in the reaction tank, and an aeration device 116 is installed in the aeration device 117. Is connected.

  First, a flow meter 41 for measuring the amount of sewage flowing into the water treatment facility 10 upstream of the settling basin 111, a COD concentration meter 142 for measuring the quality of sewage flowing into the reaction tank 112 at the reaction tank inlet, and the reaction tank 112 An ammonia nitrogen concentration meter 143 that measures the ammonia nitrogen concentration in the sewage that flows into the tank is provided, and an MLSS meter 145 that measures the MLSS concentration in the reaction tank 112 and a DO meter 146 that measures the DO concentration.

Series 2 is not equipped with a densitometer that measures the quality of the sewage flowing into the reaction tank.

  In FIG. 1, a return line having a return sludge pump 119 is provided between the final sedimentation tank 115 and the reaction tank 112.

  FIG. 3 is a block diagram showing a signal flow in FIG.

  In FIG. 3, the operation support device 121 is installed at a parameter setting unit 122 for setting a parameter necessary for calculating a necessary aeration air volume, a flow meter 41 installed at an upstream portion of the first sedimentation basin 111, and a reaction tank inlet. Necessary to remove BOD and Kjeldahl nitrogen in sewage flowing into the reaction tank based on signals from COD concentration meter 142, ammonia nitrogen concentration meter 143, MLSS meter 145 installed in reaction tank 112, DO meter 146 Between the measurement value of the required oxygen amount calculation unit 123 for calculating a necessary oxygen amount and the measurement value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter 146 The target value of the dissolved oxygen concentration required to meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the Based on the required acid A feedback calculation unit 124 that performs feedback adjustment of the oxygen amount calculated by the amount calculation unit 123, and calculates a necessary aeration air volume based on the oxygen amount after the feedback adjustment and the performance curve of the diffuser 117, and the aeration air volume control device 130 An aeration air volume calculation unit 125 that transfers to the aeration air volume setting unit 131 is provided.

  On the other hand, an aeration air volume control device 130 having an aeration air volume setting unit 131 and an aeration air volume control unit 132 is connected to the aeration device 116, and the aeration air volume control device 130 matches the aeration air volume for which the aeration air volume answer value 150 is set. Thus, the aeration apparatus 116 is controlled.

  Here, the aeration air volume answer value is the aeration air volume actually supplied to the aeration apparatus by the aeration apparatus.

  Hereinafter, the parameter setting unit 122, the required oxygen amount calculation unit 123, the feedback calculation unit 124, and the aeration air amount calculation unit 125 will be described.

  In the parameter setting unit 122, the inflow distribution ratio, the oxygen amount required per removal BOD, the removal rate of the inflow BOD, the nitrification rate of the inflow Kjeldahl nitrogen, the endogenous respiration coefficient, aerobic, which are necessary for calculating the aeration air volume Partial reaction tank volume, MLVSS / MLSS ratio, multiplier and constant for calculating BOD from measured value of COD concentration meter, multiplier and constant for calculating Kjeldahl nitrogen concentration from measured value of ammonia nitrogen concentration meter, feedback Parameters such as the initial value of the aeration coefficient, proportional gain, integral constant, target value of dissolved oxygen concentration, and performance curve of the diffuser required for the calculation are set by the operator.

  Based on the parameters set by the parameter setting unit 122 and the measured values of the flow meter 41, the COD concentration meter 142, the ammonia nitrogen concentration meter 143, and the MLSS meter 145, the required oxygen amount calculation unit 123 The amount of oxygen necessary to remove nitrogen is calculated.

  Here, in series 2, the required oxygen amount calculation unit 223 uses the parameters set by the parameter setting unit 222 and the measured values of the flow meter 41, the COD concentration meter 142, the ammonia nitrogen concentration meter 143, and the MLSS meter 245. Based on this, the amount of oxygen required to remove organics and nitrogen in the influent water is calculated.

  If the inflow distribution ratio is equal and the initial sedimentation basin removal rate is the same, the quality of the sewage flowing into the reaction tank 112 of the series 1 and the quality of the sewage flowing into the reaction tank 212 of the series 2 are equal. Inflow distribution rate and initial sedimentation basin removal rate differ from series to series, and as a result, the quality of sewage flowing into the reaction tank is often different.

  Therefore, when calculating the required oxygen amount in series 2, if the COD concentration meter 142 and ammonia nitrogen concentration meter 143 installed in series 1 are used, the calculated required oxygen amount is the reaction of series 1 and series 2. It includes errors due to differences in the quality of sewage flowing into the tank.

  In the present embodiment, such an error is dealt with by the action of the feedback calculation unit 224.

  The feedback calculation unit 124 performs feedback adjustment of the required oxygen amount based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the DO meter 146.

  The aeration air volume calculation unit 125 calculates a necessary aeration air volume based on the oxygen amount after the feedback adjustment and the performance curve of the diffuser 117, and transfers it to the aeration air volume setting unit 131 of the aeration air volume controller 130.

  In the aeration air volume control unit 132 of the aeration air volume control device 130, the aeration air volume answer value 150 is set based on the deviation between the aeration air volume set in the aeration air volume setting unit 131 and the aeration air volume answer value 150 from the aeration device 116. The aeration apparatus 116 is controlled so as to coincide with the amount of aeration air input to 131.

  Next, the operation in this embodiment will be described.

  The sewage is first settled and removed in the sedimentation basin 111. In the reaction tank 112, sewage is mixed with activated sludge and aerated by air sent from the aeration apparatus 116 via the aeration apparatus 117, and organic substances are removed by the metabolic action of microorganisms contained in the activated sludge. The activated sludge mixed liquid is purified in the final sedimentation basin 115 as the activated sludge settles.

  In order to remove nitrogen from sewage, the reaction tank 112 is divided into an aerobic tank 114 and an oxygen-free tank 113. In the aerobic tank 114, nitrogen compounds such as ammonia in sewage are oxidized to nitric acid. The nitric acid produced in the aerobic tank 114 is sent from the aerobic tank 114 to the anoxic tank 113 through the return sludge. In the anoxic tank 113, as a result of nitric acid respiration of the activated sludge, it becomes nitrogen gas and is removed to the atmosphere. .

  During this time, in the required oxygen amount calculation unit 123 of the operation support apparatus 121, various parameters set by the operator in the parameter setting unit 122 of the operation support apparatus 121, the flow meter 41 installed at the reaction tank inlet, the COD concentration meter 142, Based on the signals from the ammonia nitrogen concentration meter 143 and the MLSS meter 145 installed in the reaction tank 112, the amount of oxygen necessary for removing organic substances and nitrogen is calculated.

  A method for calculating the necessary aeration air volume will be further described.

  The required oxygen amount calculation unit 123 calculates the amount of oxygen required for the oxidation of BOD, the amount of oxygen required for the nitrification reaction, and the amount of oxygen required for endogenous respiration, and sums them to enter the reaction tank. There is provided a first calculating means for calculating the amount of oxygen necessary for removing organic substances and nitrogen in the sewage.

  In the first calculation means, a BOD that is oxidized by activated sludge in the reaction tank 112 from a value obtained by multiplying the BOD load calculated based on the measured values of the flow meter 41 and the COD concentration meter 142 by the BOD removal rate in the reaction tank. The amount is calculated, and the amount of oxygen necessary for the oxidation of BOD is calculated from the amount of BOD.

  In addition, the amount of Kjeldahl nitrogen oxidized by activated sludge in the reaction tank 112 is reduced by subtracting the Kjeldahl nitrogen removal amount by excess sludge from the Kjeldahl nitrogen load calculated based on the measured values of the flow meter 41 and the ammoniacal nitrogen concentration meter 143. The amount of oxygen necessary for the nitrification reaction is calculated from the amount of Kjeldahl nitrogen.

  Further, based on the measurement value of the MLSS meter 145, the amount of oxygen necessary for endogenous respiration is calculated.

  In addition, in order to remove the organic matter and nitrogen in the sewage flowing into the reaction tank by adding up the amount of oxygen required for BOD oxidation, the amount of oxygen required for the nitrification reaction, and the amount of oxygen required for endogenous respiration. The amount of oxygen required for the calculation is calculated.

  The first calculation means can be expressed by equations (1) to (3)

In order to calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank, it is necessary to know the amount of sewage flowing into the reaction tank, but the sewage flowing into the water treatment facility Although it is common to install a flow meter that measures the amount of water, a flow meter that measures the amount of sewage flowing into the reaction tank is rarely installed for each series.

Therefore, the amount of sewage flowing into the reaction tank is calculated based on the measured value of the flow meter that measures the amount of sewage flowing into the water treatment facility, but the amount of sewage flowing into the reaction tank is evenly distributed. However, in order to calculate the inflow amount to the reaction tank for each series from the amount of sewage flowing into the water treatment facility, it is necessary to use a unique inflow distribution ratio for each series.

The inflow distribution ratio can be calculated by measuring the amount of sewage flowing into the reaction tank with a temporary flow meter and dividing this by the measured value of the flow meter that measures the amount of sewage flowing into the water treatment facility. However, since the inflow distribution ratio is not unchanged and often changes depending on the amount of sewage flowing into the water treatment facility, the duration of measurement of the amount of sewage flowing into the reaction tank with a temporary flow meter is 24 hours or more. Is desirable.

  In equation (1), the BOD concentration BODin is the correlation between the BOD analysis value and the COD densitometer measurement value on the basis that the measurement value of the COD densitometer and the BOD analysis result show a high correlation as shown in FIG. Based on the relationship, the turbidimeter measurement value CODin is calculated by the following formula.

であり、これらの値は下水処理場によって、また、同じ下水処理場においても季節変動等により変化するものであることから、反応タンクに流入する下水の水質分析を行い、図１９の例に示すような相関式を算出することにより定める。

Since these values vary depending on the sewage treatment plant and the seasonal variation in the same sewage treatment plant, the water quality analysis of the sewage flowing into the reaction tank is performed and shown in the example of FIG. It is determined by calculating such a correlation equation.

Further, the Kjeldahl nitrogen concentration KjNin is based on the fact that the ammoniacal nitrogen concentration meter measurement value and the Kjeldahl nitrogen analysis value show a high correlation as shown in FIG.
Based on the correlation between the Kjeldahl nitrogen analysis value and the ammonia nitrogen concentration meter measurement value, it is calculated from the ammonia nitrogen concentration meter measurement value NHin by the following equation.

であり、これらの値は下水処理場によって、また、同じ下水処理場においても季節変動等により変化するものであることから、反応タンクに流入する下水の水質分析を行い、図20の例に示すような相関式を算出することにより定める。

Since these values vary depending on the sewage treatment plant and also seasonal variations in the same sewage treatment plant, the water quality analysis of the sewage flowing into the reaction tank was conducted and shown in the example of FIG. It is determined by calculating such a correlation equation.

  In the second calculation means, the required oxygen amount OR is calculated based on the deviation e (t) between the target value SV_DO (t) of the dissolved oxygen concentration and the measured value PV_DO (t) of the DO meter 45 by (4) to (6). Correct (t).

  The target value of the dissolved oxygen concentration is determined based on the relationship between the measured value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank and the measured value of the dissolved oxygen concentration meter 146 in advance. It is determined based on meeting the target value of ammonia nitrogen concentration.

  A method for setting the target value of the dissolved oxygen concentration will be further described.

  FIG. 2 shows a state where an ammonia nitrogen concentration meter 147 is temporarily installed in the reaction tank aerobic tank 114 in the first embodiment.

  The measurement value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank 114 is input to the feedback calculation unit 124 of the operation support device 121, and the date, time, and dissolved oxygen concentration meter 146 are measured at regular intervals. It is recorded in a form that can be referred to together with the measurement value.

  As shown in FIG. 21, the target value of the dissolved oxygen concentration is temporarily set in the reaction tank aerobic tank 114 in advance based on the high correlation between the dissolved oxygen concentration in the reaction tank aerobic tank and the ammonia nitrogen concentration. On the basis of the relationship between the measured value of the ammonia nitrogen concentration meter 147 and the measured value of the dissolved oxygen concentration meter 146, the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined as a reference.

  In the reaction tank, the closer to the inlet side, the higher the organic component concentration and the nitrogen component concentration, and the greater the amount of oxygen required to process them, so in general, DO is lower the closer to the inlet side, the lower the outlet side. It is distributed with a gradient in the flow direction in the tank so that it becomes higher as it approaches. The gradient of DO is not constant, but varies depending on the amount of influent water and the water quality. When the load is low, the gradient is gentle, and the gradient becomes steeper as the load increases.

  On the other hand, in sewage treatment plants that mainly handle domestic wastewater, the amount and quality of influent water often show periodic fluctuations depending on the life patterns of people.

  Therefore, it is desirable that the relationship between the measurement value of the ammonia nitrogen concentration meter and the measurement value of the dissolved oxygen concentration meter is determined based on at least the measurement value for a period exceeding one week.

  The oxygen amount necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank calculated by the equation (1) is corrected by this method, and the corrected required oxygen amount and the performance curve of the diffuser 117 are calculated. Based on the above, the required aeration air volume is calculated.

  After calculating the required amount of oxygen in this way, the required amount of aeration air is calculated by the third calculation means based on the required amount of oxygen and the performance curve of the diffuser 117. The calculating means is represented by the following equation.

The oxygen transfer efficiency E _{A1 with} respect to the mixed solution decreases as the aeration air volume increases as shown in the example of the performance curve of the air diffuser in FIG. Therefore, the value of the oxygen transfer efficiency E _{A1 with} respect to the mixed solution is not a fixed value, but is calculated by the following equation as a value that varies depending on the aeration air volume.

である。

It is.

  The aeration air volume calculated in this way is transferred to the aeration air volume setting unit 131 of the aeration air volume control device 130.

  Based on the deviation between the aeration air volume set in the aeration air volume setting unit 131 and the aeration air volume answer value 150 from the aeration device 116, the aeration air volume control unit 132 of the aeration air volume control device 130 determines the aeration air volume answer value as the aeration air volume setting unit 131. The aeration apparatus 116 is controlled so as to coincide with the aeration air volume input to.

  Thus, according to the present embodiment, the amount and quality of sewage flowing into the reaction tank, the amount of oxygen necessary to remove BOD and Kjeldahl nitrogen from the water quality of the reaction tank aerobic tank are calculated, and the reaction is performed in advance. To meet the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the tank aerobic tank and the measurement value of the dissolved oxygen concentration meter. After determining the target value of the required dissolved oxygen concentration, the oxygen amount is feedback-adjusted based on the deviation between the measured value of the dissolved oxygen concentration and the target value. Since the required aeration air volume can be calculated from the performance curve of the aeration apparatus, by transferring this aeration air volume to the aeration air volume setting unit of the aeration air volume control device, exposure is performed so as to match the set aeration air volume. Air volume control device organics and processing of nitrogen it is possible to effectively perform by controlling the aeration device, it is possible to maintain a good quality of treated water stably.

  In addition, the calculated aeration air volume is based on the measured amount of sewage water and water quality at that time, so unlike operating settings based on experience and intuition, this setting allows for a margin for unexpected fluctuations. Since it is not necessary to perform the operation, it is possible to operate with an aeration air volume smaller than that when the operation is performed by DO control.

  Furthermore, installation of an ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, and water temperature meter in the reaction tank, which is required for OR control, is no longer necessary, and these introduction costs and maintenance costs can be reduced. Become.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In FIG. 4, the water treatment facility 10 of the sewage treatment plant is divided into two series, series 1 and series 2. The configuration is the same except for the presence or absence of a densitometer that measures the quality of the sewage that flows into the reaction tank, so the detailed configuration will be explained for Series 1, and only the parts that are different from Series 1 will be explained. explain.

  In the second embodiment shown in FIG. 4, an ammonia nitrogen concentration meter 143 for measuring the ammonia nitrogen concentration is installed in the reaction tank anoxic tank 113, and the others are the same as those in the first embodiment shown in FIG. The form is the same.

  In FIG. 4, the same parts as those of the first embodiment shown in FIG.

  FIG. 6 is a block diagram showing a signal flow in FIG.

  In FIG. 6, the same parts as those in the block diagram showing the signal flow in FIG. 1 shown in FIG.

  In the parameter setting unit 122, a multiplier and a constant for calculating the Kjeldahl nitrogen concentration in the reaction tank anoxic tank 113 from the sludge return ratio, the measurement value of the ammonia nitrogen concentration meter 143 installed in the reaction tank anoxic tank 113 are implemented. It is set by the operator as a parameter specific to the form.

  Based on the parameters set by the parameter setting unit 122 and the measured values of the flow meter 41, the COD concentration meter 142, the ammonia nitrogen concentration meter 143, and the MLSS meter 145, the required oxygen amount calculation unit 123 First calculation means for calculating the amount of oxygen necessary for removing nitrogen is provided.

  Here, in series 2, the required oxygen amount calculation unit 223 uses the parameters set by the parameter setting unit 222 and the measured values of the flow meter 41, the COD concentration meter 142, the ammonia nitrogen concentration meter 143, and the MLSS meter 245. Based on this, the amount of oxygen required to remove organics and nitrogen in the influent water is calculated.

  The feedback calculation unit 124 includes second calculation means for performing feedback adjustment of the required oxygen amount based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the DO meter 146.

  The target value of the dissolved oxygen concentration is determined based on the relationship between the measured value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank 114 and the measured value of the dissolved oxygen concentration meter 146 in advance. It is determined on the basis that the tank ammoniacal nitrogen concentration target value is satisfied.

  FIG. 5 shows a state where the ammonia nitrogen concentration meter 147 is temporarily installed in the reaction tank aerobic tank 114 in the second embodiment.

  The measurement value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank 114 is input to the feedback calculation unit 124 of the operation support device 121, and the date, time, and dissolved oxygen concentration meter 146 are measured at regular intervals. It is recorded in a form that can be referred to together with the measurement value.

  The aeration air volume calculation unit 125 calculates a required aeration air volume based on the oxygen amount after the feedback adjustment and the performance curve of the aeration device 117, and transfers it to the aeration air volume setting unit 131 of the aeration air volume control device 130. Means.

  In the aeration air volume control unit 132 of the aeration air volume control device 130, the aeration air volume answer value 150 is set based on the deviation between the aeration air volume set in the aeration air volume setting unit 131 and the aeration air volume answer value 150 from the aeration device 116. The aeration apparatus 116 is controlled so as to coincide with the amount of aeration air input to 131.

  Next, the operation in this embodiment will be described.

  In order to remove nitrogen from sewage, the reaction tank 112 is divided into an aerobic tank 114 and an oxygen-free tank 113. In the aerobic tank 114, nitrogen compounds such as ammonia in sewage are oxidized to nitric acid. The nitric acid produced in the aerobic tank 114 is sent from the aerobic tank 114 to the anoxic tank 113 through the return sludge. In the anoxic tank 113, as a result of nitric acid respiration of the activated sludge, it becomes nitrogen gas and is removed to the atmosphere. .

  During this time, since the nitrification reaction does not occur in the anaerobic tank 113, the amount of oxygen necessary for nitrification in the aerobic tank 114 can be calculated based on the measured value of the ammonia nitrogen concentration meter 143 installed in the anoxic tank 113. it can.

  In general, a densitometer that measures the quality of influent water tends to cause errors due to contamination. This is because oil and fat, calcium, and the like contained in sewage adhere to the detection unit. In order to prevent such a phenomenon, it is possible to add cleaning functions such as water cleaning, air cleaning, and ultrasonic cleaning, but such measures were taken in the concentration meter for measuring the influent water quality. Even in this case, it is difficult to prevent the influence of dirt, and regular maintenance is required.

  In the present embodiment, an ammonia nitrogen concentration meter is installed in the oxygen-free tank for the purpose of suppressing adhesion of fats and oils and calcium contained in sewage to the detection unit. In the anaerobic tank, the concentration of oils and fats, calcium, and the like decreases due to the dilution effect by the return sludge, the initial adsorption effect of the activated sludge, and the like, so that the adhesion of dirt to the detection unit is suppressed.

  In the second embodiment, the first calculation means for calculating the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank is expressed by the equations (9) to (11). Can do.

  In equation (9), the BOD concentration BODin is the correlation between the BOD analysis value and the COD densitometer measurement value on the basis that the measurement value of the COD densitometer and the BOD analysis result show a high correlation as shown in FIG. Based on the relationship, the turbidimeter measurement value CODin is calculated by the following formula.

The Kjeldahl nitrogen concentration KjN _AN is based on the fact that the measured values of ammonia nitrogen concentration meter and Kjeldahl nitrogen analysis value are highly correlated as shown in FIG. Based on the correlation, the reaction tank anoxic tank ammonia nitrogen concentration meter measured value NH _{AN is} calculated by the following equation.

  In the second calculation means, the reaction tank aerobic tank is based on the relationship between the measurement value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank 114 and the measurement value of the dissolved oxygen concentration meter 146. After determining the target value of the dissolved oxygen concentration required to satisfy the target value of the ammonia nitrogen concentration, based on the deviation between the measured value of the dissolved oxygen concentration and the target value, the equations (9) to (9) 11) Feedback adjustment of the amount of oxygen required to remove the BOD and Kjeldahl nitrogen calculated in step 11), and then, using the third calculation means, the required amount of oxygen and the performance curve of the diffuser 117 are required. The aeration air volume is calculated, and this aeration air volume is transferred to the aeration air volume setting unit 131 of the aeration air volume controller 130.

  According to this embodiment, in addition to the same effect as the driving support device shown in the first embodiment, the reaction tank anaerobic tank or reaction tank can be obtained from the sewage flowing into the reaction tank as the measurement target of the ammonia nitrogen concentration meter. By adopting the oxygen-free tank, the influence of the pollutant on the ammonia nitrogen concentration meter is reduced, and the maintenance cost can be further reduced.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In FIG. 7, the water treatment facility 10 of the sewage treatment plant is divided into two series, series 1 and series 2. The configuration is the same except for the presence or absence of a densitometer that measures the quality of the sewage that flows into the reaction tank, so the detailed configuration will be explained for Series 1, and only the parts that are different from Series 1 will be explained. explain.

  The third embodiment shown in FIG. 7 excludes the COD concentration meter 142 that measures the COD concentration of sewage flowing into the reaction tank 112 and the MLSS meter 145 that measures the MLSS concentration in the reaction tank aerobic tank 112. Others are the same as those of the first embodiment shown in FIG.

  In FIG. 7, the same parts as those of the first embodiment shown in FIG.

  FIG. 9 is a block diagram showing a signal flow in FIG.

  9, the same parts as those in the block diagram showing the signal flow in FIG. 1 shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the parameter setting unit 122, a multiplier for calculating the BOD in the sewage flowing into the reaction tank 112 from the measurement value of the ammonia nitrogen concentration meter 143 that measures the ammonia nitrogen concentration in the sewage flowing into the reaction tank 112, and The constant is set by the operator as a parameter specific to the present embodiment.

  Based on the parameters set by the parameter setting unit 122 and the measured values of the flow meter 41 and the ammonia nitrogen concentration meter 143, the required oxygen amount calculation unit 123 is configured to remove oxygen necessary for removing organic substances and nitrogen from the influent water. First calculating means for calculating the quantity is provided.

  Here, in the series 2, the required oxygen amount calculation unit 223 flows in based on the parameters set by the parameter setting unit 222 and the measured values of the flow meter 41, the COD concentration meter 142, and the ammonia nitrogen concentration meter 143. Calculate the amount of oxygen required to remove water organics and nitrogen.

  The feedback calculation unit 124 includes second calculation means for performing feedback adjustment of the required oxygen amount based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the DO meter 146.

  The target value of the dissolved oxygen concentration is determined based on the relationship between the measured value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank 114 and the measured value of the dissolved oxygen concentration meter 146 in advance. It is determined on the basis that the tank ammoniacal nitrogen concentration target value is satisfied.

  FIG. 8 shows a state where an ammonia nitrogen concentration meter 147 is temporarily installed in the reaction tank aerobic tank 114 in the third embodiment.

  The measurement value of the ammonia nitrogen concentration meter 147 temporarily installed in the reaction tank aerobic tank 114 is input to the feedback calculation unit 124 of the operation support device 121, and the date, time, and dissolved oxygen concentration meter 146 are measured at regular intervals. It is recorded in a form that can be referred to together with the measurement value.

  The aeration air volume calculation unit 125 calculates a required aeration air volume based on the oxygen amount after the feedback adjustment and the performance curve of the aeration device 117, and transfers it to the aeration air volume setting unit 131 of the aeration air volume control device 130. Means.

  In the aeration air volume control unit 132 of the aeration air volume control device 130, the aeration air volume answer value 150 is set based on the deviation between the aeration air volume set in the aeration air volume setting unit 131 and the aeration air volume answer value 150 from the aeration device 116. The aeration apparatus 116 is controlled so as to coincide with the amount of aeration air input to 131.

  Next, the operation in this embodiment will be described.

  In sewage, mainly domestic sewage, the organic matter concentration and nitrogen concentration in sewage generally exhibit almost the same behavior, although there is a slight time lag. In other words, it begins to rise from the beginning of the day when people start their activities, temporarily decreases from noon to evening, then rises again from evening to midnight, and then decreases again when the day changes.

  Therefore, as shown in FIG. 22, when the BOD and Kjeldahl nitrogen in the sewage are plotted on a scatter diagram, it is common that a high correlation is obtained.

  Therefore, in the third embodiment, the first calculation means for calculating the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank is expressed by the equations (12) to (14). Can show.

  In equation (12), the BOD concentration BODin is based on the fact that the ammonia nitrogen concentration meter measured value of sewage flowing into the reaction tank and the BOD analysis value are highly correlated as shown in FIG. Based on the correlation between the measured value and the BOD analysis value, the ammonia nitrogen concentration meter measured value NHin is calculated by the following equation.

  The Kjeldahl nitrogen concentration KjNin is based on the fact that the measured value of ammonia nitrogen concentration meter and the measured value of Kjeldahl nitrogen show a high correlation as shown in FIG. Based on the correlation, it is calculated by the following equation from the measured value NHin of an ammonia nitrogen concentration meter that measures the quality of sewage flowing into the reaction tank.

  In this embodiment, the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen is calculated by the first calculation means, and the ammonia temporarily installed in the reaction tank aerobic tank in advance by the second calculation means. Target value of the dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration based on the relationship between the measured value of the reactive nitrogen concentration meter 147 and the measured value of the dissolved oxygen concentration meter 146 And adjusting the amount of oxygen feedback based on the deviation between the measured value of the dissolved oxygen concentration and the target value, and the required amount of oxygen calculated by the third calculating means and the diffuser. After calculating the necessary aeration air volume from the performance curve 117, the aeration air volume is transferred to the aeration air volume setting unit 131 of the aeration air volume controller 130.

  According to this embodiment, the same effect as the driving support device shown in the first embodiment can be obtained, and the installation cost and the maintenance management cost can be further reduced because the installation of the COD concentration meter is unnecessary. Is possible.

In addition, if the measurement target of the ammonia nitrogen concentration meter is a reaction tank anaerobic tank or reaction tank anoxic tank, the influence of pollutants on the ammonia nitrogen concentration meter will be reduced, further increasing the maintenance cost. Reduction is possible.
MLSS meter [Example 4]

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  In FIG. 10, the water treatment facility 10 of the sewage treatment plant is divided into two series, series 1 and series 2. Whether there is a flow meter that measures the amount of sewage flowing into the reaction tank, a concentration meter that measures water quality, an ammonia nitrogen concentration meter, a nitrate nitrogen concentration meter, a water temperature meter, and a DO meter that measures the water quality of the reaction tank Since the other configuration is the same, the detailed configuration of the series 1 will be described, and the series 2 will be described only in parts different from the series 1.

  In the fourth embodiment shown in FIG. 10, in series 1, a flow meter 141 that measures the flow rate of sewage flowing into the reaction tank is used instead of the flow meter that measures the flow rate of sewage flowing into the water treatment facility 10. In place of the DO meter that measures the water quality of the reaction tank aerobic tank 114, an ammonia nitrogen concentration meter 147, a nitrate nitrogen concentration meter 148, and a water temperature meter 149 that measure the water quality of the reaction tank aerobic tank 114 are provided. In series 2, the MLSS meter for measuring the water quality of the reaction tank aerobic tank 214 is excluded, and the others are the same as those in the first embodiment shown in FIG.

  In FIG. 10, the same parts as those of the first embodiment shown in FIG.

  FIG. 12 is a block diagram showing a signal flow in FIG.

  In FIG. 12, the same parts as those in the block diagram showing the signal flow in FIG. 1 shown in FIG.

  In the parameter setting unit 122, the BOD amount of sewage consumed by denitrification, the sludge return ratio, the endogenous respiration coefficient at the reference temperature, the water temperature correction coefficient, and the like are set by the operator as parameters specific to the present embodiment.

  The required oxygen amount calculation unit 123 includes the parameters set by the parameter setting unit 122, the flow meter 141, the COD concentration meter 142, the ammonia nitrogen concentration meter 143, the MLSS meter 145, the ammonia nitrogen concentration meter 147, and the nitrate nitrogen concentration. Based on the measured values of the meter 148 and the water temperature meter 149, there is provided a first calculation means for calculating the amount of aeration air necessary for removing the organic matter and nitrogen of the influent water.

  The feedback calculation unit 124 is a second calculation unit that feedback-adjusts the necessary oxygen amount based on the deviation between the target value of the ammonia nitrogen concentration in the reaction tank aerobic tank 114 and the measurement value of the ammonia nitrogen concentration meter 147. Is provided.

  Here, in series 2, the organic matter and nitrogen in the influent water are removed based on the parameters set by the parameter setting unit 222 and the required oxygen amount calculated by the required oxygen amount calculation unit 123 of the driving support device 121. Therefore, the required oxygen amount calculation unit 223 is provided with a third means for calculating the oxygen amount necessary for this.

  In series 2, the feedback calculation unit 224 includes fourth calculation means for performing feedback adjustment of the required oxygen amount based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the DO meter 246.

  The target value of the dissolved oxygen concentration is determined in advance based on the relationship between the measured value of the ammonia nitrogen concentration meter 247 temporarily installed in the reaction tank aerobic tank 214 and the measured value of the dissolved oxygen concentration meter 246. It is determined on the basis that the tank ammoniacal nitrogen concentration target value is satisfied.

  FIG. 11 shows a state where an ammonia nitrogen concentration meter 247 is temporarily installed in the reaction tank aerobic tank 214 in the fourth embodiment.

  The measurement value of the ammonia nitrogen concentration meter 247 temporarily installed in the reaction tank aerobic tank 214 is input to the feedback calculation unit 224 of the operation support device 221, and the date, time, and dissolved oxygen concentration meter 246 are measured at regular intervals. It is recorded in a form that can be referred to together with the measurement value.

  The aeration air volume calculation unit 125 calculates the required aeration air volume based on the oxygen amount after feedback adjustment and the performance curve of the aeration device 117, and transfers the fifth calculation to the aeration air volume setting unit 131 of the aeration air volume control device 130 Means.

  In the aeration air volume control unit 132 of the aeration air volume control device 130, the aeration air volume answer value 150 is set based on the deviation between the aeration air volume set in the aeration air volume setting unit 131 and the aeration air volume answer value 150 from the aeration device 116. The aeration apparatus 116 is controlled so as to coincide with the amount of aeration air input to 131.

  Next, the operation in this embodiment will be described.

  In order to more accurately calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank, the difference between the target value and the measured value of ammonia nitrogen in the reaction tank aerobic tank Based on this, the amount of oxygen required for nitrification is corrected, the amount of BOD removed by denitrification is calculated based on the nitrate nitrogen concentration in the reaction tank aerobic tank, and endogenous respiration is performed based on the water temperature in the reaction tank aerobic tank. It is effective to correct the required amount of oxygen.

  Therefore, in the fourth embodiment, the first calculation means for calculating the amount of oxygen necessary to remove BOD and Kjeldahl nitrogen in the sewage flowing into the series 1 reaction tank is expressed by the following formula (15) to It can be shown by (18).

  In equation (15), the BOD concentration BODin is the correlation between the BOD analysis value and the COD densitometer measurement value on the basis that the measurement value of the COD densitometer and the BOD analysis result show a high correlation as shown in FIG. Based on the relationship, the turbidimeter measurement value CODin is calculated by the following formula.

  The Kjeldahl nitrogen concentration KjNin is based on the fact that the measured value of ammonia nitrogen concentration meter and the measured value of Kjeldahl nitrogen show a high correlation as shown in FIG. Based on the correlation, it is calculated by the following equation from the measured value NHin of an ammonia nitrogen concentration meter that measures the quality of sewage flowing into the reaction tank.

In the equation (15), the endogenous respiration coefficient B is calculated by the following equation based on the measured value T of the water thermometer 149 installed in the reaction tank aerobic tank 114.

In the second calculation means, the target value _{SV_N} (t) of the ammonia nitrogen concentration at the end of the reaction tank and the measurement value of the ammonia nitrogen concentration meter 147 installed in the reaction tank aerobic tank according to the equations (19) to (21) Based on the deviation e (t) of _{PV_N} (t), the required oxygen amount OR (t) is corrected.

The oxygen amount necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank calculated by the first calculating means is corrected by this method, and the corrected oxygen amount and the performance of the diffuser 117 are corrected. Based on the curve, the required aeration air volume is calculated by the third calculating means.

On the other hand, the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank of the series 2 is based on the required oxygen quantity calculated by the first calculation means in the series 1, Calculated by calculating means. The third calculation means can be expressed by equation (22).

In the fourth calculation means, based on the (23) - the target value of the dissolved oxygen concentration by (25) SV _{_DO} (t) and the DO meter 45 measurements PV deviation e _{_DO} (t) (t), requires oxygen The amount OR (t) is corrected.

  In the present embodiment, in the series 1, the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen is calculated by the first calculation means, and the target value of the ammonia nitrogen concentration at the end of the reaction tank is calculated by the second calculation means. Based on the measured value of the ammonia nitrogen concentration meter 147 installed in the reaction tank aerobic tank, the necessary oxygen amount calculated by the first calculation means is feedback adjusted, and in series 2, the first calculation in series 1 Based on the amount of oxygen required to remove BOD and Kjeldahl nitrogen calculated by the means, calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen in series 2 by the third calculating means, Based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the DO meter 246 by the calculating means, the necessary oxygen amount calculated by the third calculating means is feedback adjusted, and the second calculating means and the second calculating means 4 calculation means After calculating the required aeration air volume for each series from the required oxygen amount calculated from the above and the performance curves of the aeration apparatus 117 and the aeration apparatus 217, the aeration air volume setting unit of the aeration air volume control device 130 calculates these aeration air volumes. 131 and the aeration air volume setting unit 231 of the aeration air volume control device 230.

  According to this embodiment, the same effect as the driving support device shown in the first embodiment can be obtained, and in series 1, the difference between the target value and the measured value of ammonia nitrogen in the reaction tank aerobic tank Based on this, the amount of oxygen required for nitrification is corrected, the amount of BOD removed by denitrification is calculated based on the nitrate nitrogen concentration in the reaction tank aerobic tank, and endogenous respiration is performed based on the water temperature in the reaction tank aerobic tank. Since the required amount of oxygen can be corrected, it is possible to more accurately calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank. The necessary oxygen amount is feedback adjusted based on the deviation between the target value of ammonia nitrogen concentration in the reaction tank aerobic tank and the measurement value of the ammonia nitrogen concentration meter, and the oxygen amount after feedback adjustment and the performance curve of the diffuser Based on The necessary aeration air volume is calculated and transferred to the aeration air volume setting unit of the aeration air volume control device, so that the aeration air volume control device controls the aeration device so that it matches the set aeration air volume. The treatment can be performed more effectively, and the good treated water quality can be kept more stable.

  Also, in Series 2, since the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank calculated in Series 1 is used, the same effect as Series 1 is obtained.

In addition, although each Example mentioned above has one each of the anaerobic tank 113 and the aerobic tank 114, the sewage which flows into the reaction tank was shown about the process in which the whole quantity flows into the anoxic tank 113. And anaerobic tanks 114, a process of dividing the sewage flowing into the reaction tank into each anaerobic tank 113, an anaerobic tank in front of the anaerobic tank 113, and flowing into the reaction tank The sewage is a process in which the entire amount flows into the anaerobic tank, and in this process, any process that performs aeration, such as a process in which the nitrification liquid is circulated from the aerobic tank 114 to the anoxic tank 113, can be used. Can be applied.

Further, the number of sequences is not limited to the two sequences shown in the embodiment, and any number of sequences can be applied as long as the number is two or more.

Further, even if the aeration apparatus is not independent in each series as in the above embodiment, it is an apparatus that supplies air to a plurality of series from one aeration apparatus, and on the piping from the aeration apparatus to the aeration apparatus. The air volume adjusting valve may be controlled to adjust the aeration air volume.

10 ... Water treatment facility
111 ・ ・ ・ No.1 first sedimentation basin
112 ・ ・ ・ No. 1 reaction tank
113 ・ ・ ・ No.1 oxygen-free tank
114 ・ ・ ・ No.1 aerobic tank
115 ・ ・ ・ No. 1 final sedimentation basin
116 ・ ・ ・ No.1 aeration equipment
117 ・ ・ ・ No. 1 diffuser
118 ・ ・ ・ No.1 raw sludge pump
119 ・ ・ ・ No.1 return sludge pump
120 ... No.1 surplus sludge pump
121 ・ ・ ・ No.1 driving support device
122 ・ ・ ・ No.1 parameter setting part
123 ・ ・ ・ No.1 required oxygen calculation section
124 ・ ・ ・ No.1 feedback calculator
125 ・ ・ ・ No.1 aeration air volume calculation unit
128 ・ ・ ・ No.1 DO controller
130 ・ ・ ・ No.1 aeration air volume control device
131 ・ ・ ・ No.1 aeration air volume setting section
132 ・ ・ ・ No.1 aeration air volume control unit
41 ... Flow meter
141 ... No.1 flow meter
142 ... No.1 COD concentration meter
143 ... Ammonia nitrogen concentration meter
145 ... No.1 MLSS meter
146 ... No. 1 DO total
147 ... No.1 ammonia nitrogen concentration meter
148 ・ ・ ・ No.1 nitrate nitrogen concentration meter
149 ... No.1 water temperature gauge
150 ・ ・ ・ No.1 aeration air volume answer value
211 ... No. 2 first sedimentation basin
212 ... No. 2 reaction tank
213 ... No. 2 oxygen-free tank
214 ... No.2 aerobic tank
215 ... No. 2 final sedimentation basin
216 ... No. 2 aeration equipment
217 ... No. 2 diffuser
218 ・ ・ ・ No.2 raw sludge pump
219 ・ ・ ・ No.2 return sludge pump
220 ... No.2 surplus sludge pump
221 ... No. 2 driving support device
222 ・ ・ ・ No.2 parameter setting part
223 ・ ・ ・ No.2 required oxygen calculation unit
224 ・ ・ ・ No.2 feedback calculator
225 ・ ・ ・ No.2 aeration air volume calculator
228 ・ ・ ・ No.2 DO controller
230 ... No. 2 aeration air volume control device
231 ... No.2 aeration air volume setting section
232 ・ ・ ・ No.2 aeration air volume control unit
241 ... No. 2 flow meter
242 ... No. 2 COD densitometer
243 ・ ・ ・ No.2 ammonia nitrogen concentration meter
245 ・ ・ ・ No.2 MLSS meter
246 ... No. 2 DO total
247 ... No.1 ammonia nitrogen concentration meter
248 ... No.2 nitrate nitrogen concentration meter
249 ... No. 2 water temperature gauge
250 ・ ・ ・ Answer value of No. 2 aeration air volume

Claims (8)

In a water treatment facility having a plurality of series by an activated sludge method, comprising a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device,
For the aeration air volume control device that controls the aeration apparatus for each series so that the aeration air volume matches the control target value of the aeration air volume,
Calculate the amount of aeration required for treating sewage for each series,
In the operation support device of the sewage treatment plant having means for transferring the calculated aeration air volume as a control target value for each series,
A flow meter is installed to measure the amount of sewage flowing into the water treatment facility.
At least one COD densitometer, SS densitometer, or turbidimeter that measures the quality of sewage flowing into the reaction tank is installed in at least one of the multiple series, and the quality of sewage flowing into the reaction tank is measured. Ammonia nitrogen concentration meter is provided in at least one of a plurality of series,
An MLSS meter and a dissolved oxygen concentration meter for measuring the water quality of the reaction tank aerobic tank are installed for each series.
BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter, ammonia nitrogen concentration meter, MLSS meter Provided with a first calculating means for calculating for each series the amount of oxygen required to remove
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. In addition,
Provided for each series a second calculation means for feedback adjustment of the required amount of oxygen calculated by the first calculation means based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration,
A third calculating means is provided for calculating the necessary aeration air volume for each series based on the oxygen amount calculated by the second calculating means and the performance curve of the diffuser,
An operation support apparatus for a sewage treatment plant, wherein the aeration air volume calculated by the third calculation means is transferred for each series as a control target value of the aeration air volume control apparatus. In a water treatment facility having a plurality of series by an activated sludge method, comprising a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device,
For the aeration air volume control device that controls the aeration apparatus so that the aeration air volume matches the control target value of the aeration air volume,
Calculate the amount of aeration required for treating sewage for each series,
In the operation support device of the sewage treatment plant having means for transferring the calculated aeration air volume as a control target value for each series,
A flow meter is installed to measure the amount of sewage flowing into the water treatment facility.
At least one of the COD concentration meter, SS concentration meter, and turbidity meter that measures the quality of the sewage flowing into the reaction tank is provided in at least one of a plurality of series,
An ammonia nitrogen concentration meter that measures the water quality of the reaction tank anaerobic tank or reaction tank anaerobic tank is installed in at least one of the multiple series,
An MLSS meter and a dissolved oxygen concentration meter for measuring the water quality of the reaction tank aerobic tank are installed for each series.
BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter, ammonia nitrogen concentration meter, MLSS meter Provided with a first calculating means for calculating for each series the amount of oxygen required to remove
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. In addition,
Provided for each series a second calculation means for feedback adjustment of the required amount of oxygen calculated by the first calculation means based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration,
A third calculating means is provided for calculating the necessary aeration air volume for each series based on the oxygen amount calculated by the second calculating means and the performance curve of the diffuser,
An operation support apparatus for a sewage treatment plant, wherein the aeration air volume calculated by the third calculation means is transferred for each series as a control target value of the aeration air volume control apparatus. In a water treatment facility having a plurality of series by an activated sludge method, comprising a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device,
For the aeration air volume control device that controls the aeration apparatus so that the aeration air volume matches the control target value of the aeration air volume,
Calculate the amount of aeration required for treating sewage for each series,
In the operation support device of the sewage treatment plant having means for transferring the calculated aeration air volume as a control target value for each series,
A flow meter is installed to measure the amount of sewage flowing into the water treatment facility.
An ammonia nitrogen concentration meter that measures at least one of the sewage flowing into the reaction tank, the reaction tank anaerobic tank, and the reaction tank anoxic tank is provided in at least one of the plurality of series,
A dissolved oxygen concentration meter that measures the water quality of the reaction tank aerobic tank is installed for each series.
A first calculation means is provided for calculating the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measurement values of the flow meter and ammonia nitrogen concentration meter. ,
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. In addition,
Provided for each series a second calculation means for feedback adjustment of the required amount of oxygen calculated by the first calculation means based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration,
A third calculating means is provided for calculating the necessary aeration air volume for each series based on the oxygen amount calculated by the second calculating means and the performance curve of the diffuser,
An operation support apparatus for a sewage treatment plant, wherein the aeration air volume calculated by the third calculation means is transferred for each series as a control target value of the aeration air volume control apparatus. In a water treatment facility having a plurality of series by an activated sludge method, comprising a reaction tank, an aeration device installed in the reaction tank, and an aeration device connected to the aeration device,
For the aeration air volume control device that controls the aeration apparatus for each series so that the aeration air volume matches the control target value of the aeration air volume,
Calculate the amount of aeration required for treating sewage for each series,
In the operation support device of the sewage treatment plant having means for transferring the calculated aeration air volume as a control target value for each series,
Of the multiple series, one series is the representative series.
For representative series,
A flow meter for measuring the amount of sewage flowing into the reaction tank;
At least one of a COD densitometer, SS densitometer, and turbidity meter that measures the quality of sewage flowing into the reaction tank,
An ammonia nitrogen concentration meter that measures the quality of sewage flowing into the reaction tank;
MLSS meter to measure water quality in reaction tank aerobic tank, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, water temperature meter,
For the other series, a dissolved oxygen concentration meter that measures the water quality of the reaction tank aerobic tank is provided for each series.
For representative series,
Measure the water quality of at least one of the above flow meter, COD concentration meter, SS concentration meter, and turbidity meter that measures the quality of sewage flowing into the reaction tank, ammonia nitrogen concentration meter, and reaction tank aerobic tank Calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of the MLSS meter, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, and water temperature meter The calculation means of
Provided with a second calculation means for feedback adjustment of the required oxygen amount calculated by the first calculation means based on the deviation between the target value of the ammonia nitrogen concentration in the reaction tank aerobic tank and the measured value of the ammonia nitrogen concentration ,
Other series include
Based on the amount of oxygen calculated by the first calculating means, a third calculating means is provided for calculating the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank for each series,
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. In addition,
Providing a fourth calculation means for feedback adjustment of the required amount of oxygen calculated by the third calculation means for each series based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration;
A fifth calculation means is provided for calculating the required aeration air volume for each series based on the oxygen amount calculated by the second calculation means and the fourth calculation means and the performance curve of the diffuser,
An operation support apparatus for a sewage treatment plant, wherein the aeration air volume calculated by the fifth calculation means is transferred for each series as a control target value of the aeration air volume control apparatus. In an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple lines,
Measure the amount of sewage flowing into the water treatment facility with a flow meter,
The quality of sewage flowing into the reaction tank is measured in at least one of a plurality of series by at least one of a COD densitometer, SS densitometer, and turbidity meter,
The quality of sewage flowing into the reaction tank is measured with at least one of a plurality of series by an ammonia nitrogen concentration meter,
Measure the water quality of the reaction tank aerobic tank for each series with MLSS meter and dissolved oxygen concentration meter,
BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter, ammonia nitrogen concentration meter, MLSS meter Calculate the amount of oxygen required to remove the
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. ,
Based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, and after feedback adjustment of the required amount of oxygen calculated,
An operation support method for a sewage treatment plant, wherein a necessary aeration air volume is calculated for each series based on an oxygen amount after feedback adjustment and a performance curve of a diffuser. In an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple lines,
Measure the amount of sewage flowing into the water treatment facility with a flow meter,
The quality of sewage flowing into the reaction tank is measured in at least one of a plurality of series by at least one of a COD densitometer, SS densitometer, and turbidity meter,
The water quality of the reaction tank anaerobic tank or reaction tank anaerobic tank is measured with an ammoniacal nitrogen concentration meter in at least one of the multiple series,
Measure the water quality of the reaction tank aerobic tank for each series with MLSS meter and dissolved oxygen concentration meter,
BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of at least one of the above flow meter, COD concentration meter, SS concentration meter, turbidity meter, ammonia nitrogen concentration meter, MLSS meter Calculate the amount of oxygen required to remove the
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. ,
Based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, and after feedback adjustment of the required amount of oxygen calculated,
An operation support method for a sewage treatment plant, wherein a necessary aeration air volume is calculated for each series based on an oxygen amount after feedback adjustment and a performance curve of a diffuser. In an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple lines,
Measure the amount of sewage flowing into the water treatment facility with a flow meter,
At least one of the sewage flowing into the reaction tank, the reaction tank anaerobic tank, and the reaction tank anoxic tank is measured with an ammonia nitrogen concentration meter in at least one of a plurality of series,
Measure water quality of reaction tank aerobic tank for each series with dissolved oxygen concentration meter,
Calculate the amount of oxygen necessary for removing BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of the above flow meter and ammonia nitrogen concentration meter for each series,
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. ,
Based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, and after feedback adjustment of the required amount of oxygen calculated,
An operation support method for a sewage treatment plant, wherein a necessary aeration air volume is calculated for each series based on an oxygen amount after feedback adjustment and a performance curve of a diffuser. In an operation support method for a sewage treatment plant that calculates the amount of aeration air required to treat sewage at a water treatment facility having multiple lines,
Of the multiple series, one series is the representative series.
In the representative series,
Measure the amount of sewage flowing into the reaction tank with a flow meter,
Measure the quality of sewage flowing into the reaction tank with at least one of COD concentration meter, SS concentration meter, and turbidity meter,
Measure the quality of sewage flowing into the reaction tank with an ammoniacal nitrogen concentration meter,
Measure the water quality of the reaction tank aerobic tank with MLSS meter, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, water temperature meter,
In other series, the water quality of the reaction tank aerobic tank is measured for each series with a dissolved oxygen concentration meter,
In the representative series,
Measure the water quality of at least one of the above flow meter, COD concentration meter, SS concentration meter, and turbidity meter that measures the quality of sewage flowing into the reaction tank, ammonia nitrogen concentration meter, and reaction tank aerobic tank Calculate the amount of oxygen required to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank based on the measured values of MLSS meter, ammonia nitrogen concentration meter, nitrate nitrogen concentration meter, water temperature meter,
Based on the deviation between the target value of the ammonia nitrogen concentration in the reaction tank aerobic tank and the measured value of the ammonia nitrogen concentration, the calculated required oxygen amount is feedback adjusted,
Calculate the required aeration volume based on the feedback adjusted oxygen volume and the performance curve of the diffuser,
In other series,
To remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank for each series based on the amount of oxygen necessary to remove BOD and Kjeldahl nitrogen in the sewage flowing into the reaction tank calculated in the representative series Calculate the amount of oxygen required for
The relationship between the measurement value of the ammonia nitrogen concentration meter temporarily installed in the reaction tank aerobic tank in advance and the measurement value of the dissolved oxygen concentration meter, or the ammonia nitrogen of the sample collected in the reaction tank aerobic tank Based on the relationship between the concentration analysis value and the measured value of the dissolved oxygen concentration meter, the target value of dissolved oxygen concentration required to satisfy the target value of the reaction tank aerobic tank ammonia nitrogen concentration is determined for each series. In addition,
Based on the deviation between the target value of the dissolved oxygen concentration and the measured value of the dissolved oxygen concentration, the calculated required oxygen amount is feedback adjusted,
An operation support method for a sewage treatment plant, wherein a necessary aeration air volume is calculated for each series based on an oxygen amount after feedback and a performance curve of a diffuser.

Images