JP2013078732A - Operation method, operation control device, and control method for sewage plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation method or the like for a sewage treatment plant capable of reducing electric power consumption required for operating the sewage treatment plant, without deteriorating the level of sewage purification treatment.SOLUTION: In an operation method for a sewage treatment plant including a reservoir chamber storing sewage, a biological treatment tank performing biological treatment of the sewage stored in the reservoir chamber, a pump device sending treatment water to the biological treatment tank from the reservoir chamber, and an aeration device performing aeration of the biological treatment tank, operations are performed so that a first operation state for stopping the pump device and the aeration device and a second operation state for operating the pump device and the aeration device are switched in one day. Upon the transition from the second operation state to the first operation state, a stop timing of the aeration device is delayed more than a stop timing of the pump device, and upon the transition from the first operation state to the second operation state, an operation timing of the pump device is delayed more than an operation timing of the aeration device.

Description

  The present invention relates to a storage tank for storing sewage containing human waste, septic tank sludge, etc., a biological treatment tank for biologically treating the sewage stored in the storage tank, and a pump for feeding sewage from the storage tank to the biological treatment tank The present invention relates to an operation method, an operation control apparatus, and a control method of a sewage treatment plant including an apparatus and an aeration apparatus that aerates the biological treatment tank.

  In general, when a sewage treatment plant for treating human waste, etc. is constructed, the sewage treatment amount required per day is determined as the planned treatment amount from the estimated daily sewage carry-in amount. Designed capacity of sewage storage tanks and biological treatment tanks, aeration capacity to biological treatment tanks, sewage water supply capacity, etc., specifications of pump equipment for feeding sewage from each facility and aeration equipment for aeration to biological treatment tanks, etc. Is determined. And the rated processing amount which is the standard processing amount per day of a sewage treatment plant is determined by these design values.

  The carried-in sewage is subjected to pretreatment such as residue removal, and then temporarily stored in a storage tank and quantitatively sent from the storage tank to the biological treatment tank according to the planned processing amount. And the to-be-processed water by which the biological treatment was carried out is discharged | emitted by the river etc. after advanced treatments, such as activated carbon filtration. Usually, in a sewage treatment plant, an aeration apparatus is operated continuously in a rated operation state for 24 hours in order to treat a sewage of a rated treatment amount. In general, the capacity of the storage tank is designed to be about three times the daily planned throughput, and the designed amount of sewage is quantitatively sent to the biological treatment tank by a pump device.

  Patent Document 1 discloses a method for operating a sewage treatment plant that can efficiently use inexpensive late-night power while continuously operating for 24 hours.

Japanese Patent No. 3763998

  However, in recent years, the amount of septic tank sludge carried into sewage treatment plants has increased due to the spread of septic tanks. However, the amount of urine carried is decreasing with the spread of sewerage, and the amount of sewage carried into sewage treatment plants as a whole. Tend to decrease.

  Even if the amount of sewage carried per day is less than the rated treatment volume at the sewage treatment plant, if the operation is stopped during the biological treatment, the treatment environment conditions in the biological treatment tank will fluctuate significantly. Since there is a possibility that the degree of sewage purification treatment may vary, the aeration amount by the aeration device is reduced from the rated value, and the pumped water amount is less than the rated treated amount of sewage to be fed for 24 hours. It was operating continuously.

  Therefore, not only the power efficiency is poor and the power consumption is increased, but also a certain amount of power is continuously consumed in the time zone when the demand for the commercial power supply is maximum and the time zone when the demand is minimum. In particular, because the pretreatment device operates continuously during the daytime when the amount of sewage carried increases, the power consumption increases further, especially during the time when the demand for commercial power is at its maximum. Therefore, a method for operating a sewage treatment plant that can reduce power consumption has been desired.

  In view of the above-described problems, an object of the present invention is to provide an operation method and operation control device for a sewage treatment plant that can achieve a reduction in power consumption required for operation of the sewage treatment plant without impairing the degree of sewage purification treatment. And providing a control method.

  In order to achieve the above-mentioned object, the first characteristic configuration of the operation method of the sewage treatment plant according to the present invention is a storage tank for storing sewage, a biological treatment tank for biologically processing sewage stored in the storage tank, A method for operating a sewage treatment plant including a pump device for feeding sewage from a storage tank to the biological treatment tank and an aeration device for aeration of the biological treatment tank, wherein the pump device and the aeration device are stopped. The operation state and the second operation state in which the pump device and the aeration apparatus are operated are operated so as to be switched within a day, and the pump is operated at the time of transition from the second operation state to the first operation state. The stop timing of the aeration device is delayed from the stop timing of the device, and the operation timing of the pump device is delayed from the operation timing of the aeration device at the time of transition from the first operation state to the second operation state. There to that point.

  A first operation state in which the pump device and the aeration device with relatively large power consumption are stopped when the actual treatment amount of sewage carried in in a day is smaller than a presumed daily rated treatment amount; and By operating the pump device and the aeration apparatus so as to switch between the second operation states in which the pump device and the aeration apparatus are operated within one day, the pump device and the aeration apparatus can be operated for one day without continuously operating the pump device and the aeration apparatus throughout the day. Since it becomes possible to treat the treated amount of sewage in the second operation state and the pump device and the aeration device can be operated in a state where the power efficiency is good, the power consumption can be reduced.

  When the pump device and the aeration device are immediately stopped during the transition from the second operation state to the first operation state, the inside of the tank shifts to the anaerobic state before the sewage flowing into the biological treatment tank is sufficiently biologically treated. Therefore, the nitrification of ammonia by aerobic microorganisms is inhibited, and there is a risk that unnitrified ammonia will flow out as biological treated water as it is when the second operation state is entered next. By delaying the stop time of the aeration device, the biological treatment tank can be maintained in an aerobic state for a while to promote the nitrification of ammonia, and thereby, the non-nitrified ammonia is transferred to the second operation state. Can be avoided.

  In addition, in the biological treatment tank that has transitioned to the anaerobic state after a certain amount of time in the first operation state, the denitrification process has progressed and the nitrogen gas has been dissolved in the sewage, and the pump device and the aeration device are immediately operated. However, nitrogen gas is sent to the subsequent stage without being sufficiently degassed, and the problem of worsening solid-liquid separation such as precipitation occurs, but by delaying the operation timing of the pump device from the operation timing of the aeration device, Nitrogen gas dissolved in the sewage is quickly degassed. Further, when the pump device and the aeration device are immediately operated at the time of transition from the first operation state to the second operation state, the sewage flowing into the biological treatment tank that has become anaerobic in the first operation state is sufficient as described above. However, unnitrified ammonia may flow out as biologically treated water without being nitrified, but it is preferable to use an anaerobic biological treatment tank by delaying the operation time of the pump device from the operation time of the aeration device. It is possible to shift to an environment that promotes nitrification of ammonia by shifting to a gas state, thereby preventing unnitrified ammonia from flowing out as it is when shifting to the second operation state and promptly steady operation Can be migrated to.

  At the time of transition to the first operation state or the transition to the second operation state, the dissolved oxygen concentration in the biological treatment tank is 2 to 4 times the steady state, for example, about 1 to 2 mg / L in the steady state. It is preferable to increase to a dissolved oxygen concentration of about 3 to 4 mg / L higher than the oxygen concentration. Therefore, after stopping the pump device, measure the dissolved oxygen concentration in the tank and stop the aeration device when the target dissolved oxygen concentration is reached, or set the time when the dissolved oxygen concentration becomes the target value The aeration apparatus can be stopped when the timer counts up after stopping the pump apparatus.

  For example, when a transition is made to the first operating state during a time period during which there is relatively high power demand during the day, and a transition is made to the second operating state during a time period during which there is relatively little power demand during the day, there is a large amount of power demand. It becomes possible to reduce the use of power in the time zone, which can contribute to leveling the power load. And, when the power demand during the day is relatively low at midnight, and the power charge for midnight is set cheaper than in the daytime, the operating cost of the sewage treatment plant is also greatly reduced. It becomes like this.

  The second characteristic configuration of the operation method of the sewage treatment plant includes a pretreatment device that pretreats the introduced sewage and a storage that stores the sewage pretreated by the pretreatment device, as described in claim 2. A sewage treatment system comprising: a tank; a biological treatment tank that biologically treats sewage stored in the storage tank; a pump device that feeds sewage from the storage tank to the biological treatment tank; and an aeration device that aerates the biological treatment tank. A plant operating method, in which a first operation state in which the pretreatment device is operated and the pump device and the aeration device are stopped, and the pretreatment device is stopped and the pump device and the aeration device are operated. The second operation state is operated so as to be switched within a day, and when the transition from the second operation state to the first operation state is performed, the stop time of the aeration apparatus is set to be less than the stop time of the pump device. Cast was, at the time of transition from the first operating state to the second operating state lies in delaying the operation timing of the pump apparatus from operation timing of the aeration device.

  According to the above-described configuration, the following operational effects can be obtained in addition to the operational effects of the first characteristic configuration. Prior to biological treatment of the sewage carried into the sewage treatment plant, it is necessary to remove solid foreign matters such as scum contained in the sewage, and a pretreatment device is provided for this purpose. Examples of the pretreatment device include a bar screen on which fried claws are disposed, a dehydration device that stirs and dewaters sewage to which a flocculant is added, and the like. The pretreatment device operates exclusively when sewage is carried in and does not need to be operated after pretreatment. Therefore, the sewage is switched by operating the pretreatment device in the first operation state in which the pump device and the aeration device are stopped and switching the operation so as to stop the pretreatment device in the second operation state in which the pump device and the aeration device are operated. It is possible to achieve leveling of power consumption in a processing plant in a day.

  The first characteristic configuration of the operation control device of the sewage treatment plant according to the present invention is, as described in claim 3, a pump device that feeds sewage from a storage tank that stores sewage to a biological treatment tank that biologically treats sewage, An operation control apparatus for a sewage treatment plant that controls an aeration apparatus for aeration of the biological treatment tank, wherein the pump apparatus and the aeration apparatus are operated in a first operation state, and the pump apparatus and the aeration apparatus are operated. The second operation state to be controlled is operated so as to be switched within a day, and the stop timing of the aeration apparatus is more than the stop timing of the pump device at the time of transition from the second operation state to the first operation state. Is delayed, and the operation timing of the pump device is delayed from the operation timing of the aeration apparatus when the first operation state is shifted to the second operation state.

  According to the operation control apparatus of the sewage treatment plant described above, the operation method of the sewage treatment plant according to the first characteristic configuration described above can be easily realized.

  The second characteristic configuration of the operation control device of the sewage treatment plant stores a pretreatment device that pretreats the introduced sewage and the sewage pretreated by the pretreatment device, as described in claim 4. An operation control device of a sewage treatment plant that controls a pump device that feeds sewage from a storage tank to a biological treatment tank that biologically treats sewage and an aeration device that aerates the biological treatment tank, and operates the pretreatment device The first operation state for controlling and stopping the pump device and the aeration device and the second operation state for controlling the stop of the pretreatment device and the operation control of the pump device and the aeration device are switched. When the transition from the second operation state to the first operation state, the stop timing of the aeration device is delayed from the stop timing of the pump device, and the first operation state Two when migrating to the operating state lies in the delay control the operation timing of the pump apparatus from operation timing of the aeration device.

  According to the operation control apparatus of the sewage treatment plant described above, the operation method of the sewage treatment plant according to the second characteristic configuration described above can be easily realized.

  The third characteristic configuration of the operation control device of the sewage treatment plant is the operation control device of the sewage treatment plant having the above first or second characteristic configuration as described in claim 5, Based on a target sewage treatment amount and a time for transition to the first or second operation state, and a preset rated sewage treatment amount per unit time, the target sewage treatment amount is set to the pump. The calculation unit that calculates the total time for introducing sewage to be sent to the biological treatment tank by the device, and the transition to the second operation state at the transition time to the second operation state, the aeration apparatus was operated for a second predetermined time A water supply delay control unit that operates the pump device later, and transitions to the first operation state after the sewage charging total time has elapsed from the transition time to the second operation state, and stops the pump device to Predetermined time In that it includes a aeration delay control section for stopping the aeration device after over, the.

  The operation control apparatus of the sewage treatment plant having the first or second characteristic configuration described above includes an input unit that can input a target sewage treatment amount per day and a transition time to the second operation state, and calculates Based on the preset rated sewage treatment amount per unit time, the target sewage treatment amount is calculated by the pump device to calculate the total sewage input time to be sent to the biological treatment tank, and the water supply delay control unit supplies the input unit to the input unit. Transition to the second operation state at the input time to the second operation state, or the transition time to the second operation state calculated from the transition time to the first operation state and the total time of sewage input, and aeration After operating the device for the second predetermined time, the pump device is operated, and the aeration delay control unit shifts to the first operation state after the elapsed time of sewage input from the transition time to the second operation state, and stops the pump device Shi By configuring so as to stop the aeration device after elapse of a first predetermined time, it is possible to easily operation management.

  The first characteristic configuration of the control method of the sewage treatment plant according to the present invention is the sewage treatment executed by the operation control device of the sewage treatment plant having the first or second characteristic configuration as described in claim 6. A plant control method, in which an input step for inputting a target sewage treatment amount per day and a transition time to the first or second operation state, and a preset rated sewage treatment amount per unit time are set. Based on the calculation step of calculating the total amount of sewage input time for supplying the target sewage treatment amount to the biological treatment tank by the pump device, and the transition to the second operation state at the transition time to the second operation state A water supply delay control step in which the pump device is operated after the aeration device has been operated for a second predetermined time, and after the sewage charging total time has elapsed from the transition time to the second operation state. Shifts to the first operating state lies in executing the, and aeration delay control step of stopping the aeration device after elapse of a first predetermined time by stopping the pump device.

  In the second feature configuration, as described in claim 7, in addition to the first feature configuration described above, a dissolved oxygen concentration of the biological treatment tank is input in the input step, and based on the dissolved oxygen concentration. The first and second predetermined times are determined.

  The third characteristic configuration of the operation method of the sewage treatment plant according to the present invention is, as described in claim 8, a storage tank for storing sewage, and a biological treatment tank for biologically processing sewage stored in the storage tank. , A method for operating a sewage treatment plant including a pump device for feeding sewage from the storage tank to the biological treatment tank and an aeration device for aeration of the biological treatment tank, when the aeration apparatus is operated at a rating When the actual sewage treatment amount is smaller than the rated sewage treatment amount that can be biologically treated in a predetermined time, the first operating state in which the aeration apparatus and the pump device are stopped, and the actual sewage treatment amount by operating the pump device. In addition to quantitatively feeding sewage to the biological treatment tank, the operation is performed so that the second operation state in which the aeration apparatus is operated at a rated value is switched within the predetermined time.

  The fourth characteristic configuration of the operation control device of the sewage treatment plant according to the present invention is, as described in claim 9, a pump device that feeds sewage from a storage tank that stores sewage to a biological treatment tank that biologically treats sewage; An operation control device of a sewage treatment plant that controls an aeration device for aeration of the biological treatment tank, and when the aeration device is operated at a rated value, the actual sewage treatment is more than a rated sewage treatment amount that can be biologically treated in a predetermined time. A first operation state in which the aeration apparatus and the pump apparatus are stopped when the amount is small, and the pump apparatus is operated to quantitatively feed the sewage of the actual sewage treatment amount to the biological treatment tank, and the aeration The second operation state in which the device is operated at the rated value is operated so as to be switched within the predetermined time.

  A fifth characteristic configuration of the operation control apparatus for a sewage treatment plant according to the present invention is the operation control apparatus for a sewage treatment plant having the above-described fourth characteristic configuration, as described in claim 10. Based on the target sewage treatment amount per hour and the input unit for inputting the transition time to the first or second operation state, and the preset sewage treatment amount per unit time, the target sewage treatment amount A calculation unit that calculates a total time for charging sewage to be sent to the biological treatment tank by the pump device, and the aeration device and the pump device are transferred to the second operation state at the time of transition to the second operation state. The operating state of the second operating state control unit and the transition to the first operating state after the sewage charging total time has elapsed from the transition time to the second operating state, and the aeration device and the pump device are stopped. In that it includes a As an operating state control unit.

  A sixth characteristic configuration of the operation control apparatus for a sewage treatment plant according to the present invention is the operation control apparatus for a sewage treatment plant having the fourth characteristic configuration described above, as described in claim 11. Among the input unit for inputting the time zone for executing either the first or the second operation state, and processing in the input time zone based on the preset rated sewage treatment amount per unit time. A calculation unit for calculating a total amount of sewage that can be calculated, and a transition to the second operation state at the beginning of a time zone for executing the second operation state, and operating the aeration device and the pump device. A second operating state control unit, a first operating state control unit that shifts to the first operating state at an early stage of the time period for executing the first operating state, and stops the aeration apparatus and the pump device; It is in the point equipped with.

  A seventh characteristic configuration of the operation control device of the sewage treatment plant according to the present invention is the operation control device of the sewage treatment plant having the fourth characteristic configuration described above, as described in claim 12. An input unit for inputting a start time of the first and second operation states, a target sewage treatment amount per day, an operation time of the second operation state calculated from each input start time, and the target sewage treatment amount The first and second operations so that the calculated sewage treatment amount per unit time satisfies the rated sewage treatment amount per unit time set in advance. A warning unit for outputting a warning for adjusting any one of the start times of the states, and a transition to the second operation state at the start time of the second operation state to operate the aeration device and the pump device. Two operating states And control unit, wherein the process moves to the first operating state to the start time of the first operating state, in that it includes a a first operating state control unit for stopping the aeration device and the pump device.

  As described above, according to the present invention, a wastewater treatment plant operation method, an operation control device, and a wastewater treatment plant that can achieve a reduction in power consumption required for the operation of the wastewater treatment plant without impairing the degree of purification of wastewater. A control method can be provided.

Explanatory drawing of the sewage treatment plant containing the control apparatus by this invention Flow chart of control procedure executed by operation control device Explanatory drawing of another embodiment of the sewage treatment plant to which this invention is applicable Explanatory drawing of another embodiment of the sewage treatment plant to which this invention is applicable Explanatory drawing of another embodiment of the sewage treatment plant to which this invention is applicable The flowchart of the control procedure which shows another embodiment and is performed by the operation control apparatus The flowchart of the control procedure which shows another embodiment and is performed by the operation control apparatus

  Hereinafter, an operation method, an operation control device, and a control method of a sewage treatment plant according to the present invention will be described.

  Here, the sewage treatment plant 1 that employs the septic tank sludge compatible denitrification method will be described as an example. As shown in FIG. 1, a sewage treatment plant 1 includes a pretreatment facility 2 that receives carried-in human waste and septic tank sludge and performs pretreatment, a biological treatment facility 3 that purifies the pretreated sewage by biological treatment, A post-treatment facility 4 for post-treating water to be treated after biological treatment to a state suitable for discharge and a sludge treatment facility 5 for treating surplus sludge and the like generated by biological treatment and the like are provided.

  The pretreatment facility 2 includes a receiving tank 21, a pre-storage tank 23, and a storage tank 25, and a removal device 22, which is an example of a pretreatment device, is installed between the receiving tank 21 and the pre-storage tank 23. A pre-dehydration device 24, which is an example of a pretreatment device, is installed between 23 and the storage tank 25.

  Sewage such as human waste and septic tank sludge carried by a human waste collection vehicle is first put into the receiving tank 21 and sent to the removal device 22 while the solid matter is being crushed by the pump P1 with a cutter, and is not suitable for biological treatment. After the solid foreign matter such as is removed by the removal device 22, it is stored in the pretreatment tank 23.

  Further, the sewage in the pretreatment tank 23 is sent to the pre-dehydration device 24 by the pump P2, and is stored in the storage tank 25 after the solid matter is separated. The sewage stored in the storage tank 25 is sent to the biological treatment facility 3 by the pump P3.

  The iron-based inorganic flocculant is introduced from the pump P2 to the path of the pre-dehydration device 24, and the aggregate is removed by the pre-dehydration device 24. In the pre-dehydration device 24, phosphorus and nitrogen are separated from the sewage together with the BOD and SS in the sewage together with the dehydrated sludge to reduce the load to be processed in the biological treatment facility at the subsequent stage. Therefore, it is not necessary to dilute the sewage in the biological treatment facility 3 or to perform advanced treatment for removing phosphorus and COD at the subsequent stage of the biological treatment facility 3.

  The receiving tank 21 has a capacity capable of storing one day from half a day of the rated treatment amount per day when the sewage treatment plant 1 is planned so that stable treatment can be performed even when the amount of sewage carried in varies. The storage tank 25 is set to a capacity capable of storing several days of the rated processing amount.

  In the biological treatment facility 3, a denitrification tank 31, a nitrification tank 32, a secondary denitrification tank 33, and a re-aeration tank 34 are installed in order, and an aeration apparatus 35 that aerates the sewage in each tank is installed. The aeration apparatus 35 includes a blower fan B, an aeration nozzle installed in each tank, piping, and the like.

  The sewage sent from the storage tank 25 by the pump P3 is first guided to the denitrification tank 31 and denitrified, and then transferred to the nitrification tank 32 and nitrified. In the denitrification tank 31 maintained in an anaerobic state, nitrogen is separated from the sewage by anaerobic microorganisms, and the separated nitrogen is deaerated while being stirred by a small amount of bubbles supplied from the aeration apparatus 35 into the tank. The

  In the nitrification tank 32 maintained in an aerobic state by a predetermined amount of bubbles supplied into the tank from the aeration device 35, ammonia is nitrified by an aerobic microorganism, that is, decomposed into nitrate ions and nitrite ions, and positive phosphorus. Acid is taken up. Part of the sewage nitrified in the nitrification tank 32 is circulated and supplied to the denitrification tank 31 by the pump P4, and normal phosphoric acid is discharged, and denitrification treatment, that is, nitrate ions and nitrite ions are reduced to nitrogen. .

  The sewage that has been biologically treated in the nitrification tank 32 is transferred to a secondary denitrification tank 33 that is maintained in an anaerobic state, denitrified, and then transferred to a re-aeration tank 34. In the re-aeration tank 34, a membrane separation device 36 is immersed, and sewage in the tank is sucked by a pump P 5 connected to the membrane separation device 36, and treated water separated into solid and liquid by the membrane separation device 36. Is sent to the post-treatment facility 4. An aeration nozzle of the aeration device 35 is disposed below the membrane separation device 36, and the surface of the separation membrane is washed with bubbles.

  As the separation membrane used in the membrane separation device 36, an ultrafiltration membrane, a microfiltration membrane or the like is employed. As the form of the membrane, a hollow fiber membrane, a flat membrane, a tubular membrane or the like is adopted.

  Part of the sludge accumulated in the re-aeration tank 34 is returned to the denitrification tank 31 as return sludge by the pump P6, and sent to the pre-storage tank 23 as excess sludge by the pump P7.

  The excess sludge sent to the pre-storage tank 23 is separated from the sewage by the pre-dehydration device 24, and the separated sludge is subjected to a reduction treatment by the sludge treatment facility 5. The sludge treatment facility 5 includes a sludge incinerator and a sludge melting furnace.

  In the post-treatment facility 4, a raw filtration tank 41, a treated water tank 43, and a sterilization tank 44 are installed, and an activated carbon adsorption facility 42 is arranged between the raw filtration tank 41 and the treated water tank 43. The treated water that has been fed through the membrane separation device 36 and stored in the raw filtration water tank 41 is fed to the activated carbon adsorption facility 42 through the pump P8 and adsorbed to the treated water tank 43 after COD and coloring components are adsorbed. It is stored and further sterilized with hypochlorous acid or the like in the sterilization tank 44 and then discharged into a river or the like.

  A three-phase induction motor is used for each of the motors constituting the plurality of pumps P1 to P8 and the blower fan B described above. Three-phase induction motors have the characteristic that the efficiency at light load is worse than that at rated load under a constant voltage, and if it is necessary to cope with load fluctuations, a complicated control system such as terminal voltage control is required. I need it. In the present embodiment, it is possible to suppress a decrease in efficiency by suppressing load fluctuation and enabling rated load operation.

  The above-described sewage treatment plant 1 is managed by an operation control device 6 in which a computer is incorporated. Hereinafter, the operation method of the sewage treatment plant 1 controlled by the operation control device 6 will be described in detail.

  As shown in FIG. 1, the operation control device 6 includes an operation device 61, a calculation device 62, a signal input / output device 63, and the like. The operation device 61 includes an input unit composed of a plurality of input keys for inputting operation conditions and the like, and a display unit composed of liquid crystal for displaying the input conditions and control states.

  The signal input / output device 63 is an interface between the arithmetic device 62 and the sewage treatment plant 1, and an output circuit that outputs a control signal to various actuators that operate the sewage treatment plant 1 such as each pump device, and various actuators An input circuit is provided for inputting monitor signals from the sewage treatment plant 1 and detection signals from various sensors installed in the sewage treatment plant 1.

  A computer is incorporated in the arithmetic device 62, and a predetermined value is determined based on a program set in advance based on the operating conditions input via the operation device 61 and the monitor signal and detection signal input via the signal input / output device 63. As a result, a control signal for operating or stopping various actuators is output to the signal input / output device 63.

  The operation control device 6 controls the operation of the removal devices 22 and the pre-dehydration device 24, which are examples of the pumps P1 and P2 and the pre-treatment device, during a time period when the power demand is relatively large during the day, and also performs biological treatment. The pump device that needs to be operated when performing biological treatment in the tank, specifically, the first operation state in which the pumps P3 to P8 and the aeration device 35 are controlled to stop, and the time during which the power demand is relatively small in one day The belt P1 and P2 and the removal device 22 and the pre-dehydration device 24 are controlled to stop, and the pumps P3 to P8 and the aeration device 35 are switched to the second operation state in which operation control is performed in the rated operation state. In the second operation state, it is preferable that at least the aeration apparatus 35 is operated at a rated value, and the pump P3 is operated continuously or intermittently in the rated operation state, and it is preferable that sewage is quantitatively sent to the biological treatment tank.

  Here, operating the pump at the rated value is within a range of about ± 20% of power consumption required for operation at a predetermined flow rate per unit time and at a specification point where water can be fed at the head, preferably ± 15%. The operation with a power consumption within a range of about 10%, more preferably within a range of about ± 10%, is referred to as a rated operating state.

  And the operation control apparatus 6 carries out delay control of the stop timing of the aeration apparatus 35 rather than the stop timing of the pumps P3-P8 at the time of transition from the second operation state to the first operation state, and from the first operation state to the second operation. At the time of transition to the state, the operation timing of the pumps P3 to P8 is delayed from the operation timing of the aeration device 35.

  By controlling in this way, it becomes possible to reduce the use of electric power in the time zone where the demand for electric power is high in the area where the sewage treatment plant 1 is constructed, and the pumps P3 to P8 and the aeration apparatus 35 throughout the day. If the pumps P3 to P8 and the aeration apparatus 35 are operated under the operating conditions corresponding to the rated processing amount, for example, during the operation hours of the pumps P3 to P8 and the aeration apparatus 35, the sewage that is carried in a day Even when the actual processing amount is smaller than the rated processing amount, processing can be performed in this limited time zone.

  In addition, when the pumps P3 to P8 and the aeration device 35 are immediately stopped at the time of transition from the second operation state to the first operation state, the sewage that has flowed into the biological treatment tanks 31 to 34, particularly the nitrification tank 32, is sufficient. Since the inside of the tank shifts to an anaerobic state before biological treatment, the decomposition of ammonia by aerobic microorganisms is hindered, and undecomposed ammonia is discharged into the river as it is when the second operation state is next moved. Although there is such a possibility, by delaying the stop timing of the aeration apparatus 35 from the stop timing of the pumps P3 to P8, the biological treatment tanks 31 to 34 are maintained in an aerobic state for a while, thereby nitrifying ammonia. Thus, it is possible to avoid the inconvenience that undecomposed ammonia is discharged as it is when the operation state is shifted to the second operation state.

  Further, in the biological treatment tanks 31 to 34 that have shifted to an anaerobic state after a certain amount of time in the first operation state, the denitrification process proceeds and the nitrogen gas is dissolved in the sewage, and the pumps P3 to P8 are aerated. Immediately operating the device 35 causes a problem that the nitrogen gas is sent to the subsequent stage without being sufficiently deaerated, but by delaying the operation timing of the pumps P3 to P8 from the operation timing of the aeration device 35, Nitrogen gas dissolved in the sewage is quickly degassed. In particular, the deaeration process of nitrogen in the denitrification tank 31 is advanced.

  Further, when the pumps P3 to P8 and the aeration device 35 are immediately operated at the time of transition from the first operation state to the second operation state, the air flowed into the nitrification tank 32 that became anaerobic in the first operation state as described above. There is a risk that undecomposed ammonia may be discharged as it is without sufficient nitrification of the sewage, but by delaying the operation timing of the pumps P3 to P8 from the operation timing of the aeration apparatus 35, the anaerobic nitrification tank 32 Can be transferred to an aerobic state and an environment in which nitrification of ammonia is promoted can be avoided. Transition to steady operation is possible.

  At the time of transition to the first operation state or transition to the second operation state, the dissolved oxygen concentration in the biological treatment tank is 1.5 to 5 times, preferably 2 to 4 times, more preferably the steady state. Is preferably increased to a dissolved oxygen concentration of about 3 to 4 mg / L, which is higher than a dissolved oxygen concentration of about 2.5 to 3.5 times, for example, about 1 to 2 mg / L in a steady state.

  For this purpose, a sensor for measuring the dissolved oxygen concentration is provided in the tank, preferably in the nitrification tank 32, and after stopping the pumps P3 to P8, the value of the dissolved oxygen concentration measured by the sensor is transmitted via the signal input / output device 63. It is configured to be input to the arithmetic device 62. The arithmetic device controls the aeration device 35 to stop when the target dissolved oxygen concentration is reached based on the input signal value.

  Controls to enter the second operating state during the midnight hours when the electricity demand during the day is relatively late at night and the electricity charges for midnight are set at a lower price than during the day. If it does so, the operating cost of the sewage treatment plant 1, particularly the power charge will be significantly reduced.

  For example, during the day including the time zone from 8:00 am to noon when sewage is carried in, the pretreatment device is mainly operated in the first operation state, and then the first operation state is operated at night. It is preferable to control the processing equipment to operate. However, this is only an example, and the first operation state is set at least during a time period when the power demand is relatively high during one day, and the second operation state is set during a time period when there is relatively low power demand during the day. Anything can be used.

  FIG. 2 shows a control procedure executed by the operation control device 6 described above. Initially, the sewage treatment plant 1 and the operation control device 6 are powered on, and the operator calculates the target sewage treatment amount per day and the transition time to the second operation state via the input unit of the operation device 61. (S1, S2), the operation process is started (S3), and the arithmetic unit 62 biologically treats the target sewage treatment amount with the pump device based on the preset rated sewage treatment amount per unit time. The total time for introducing sewage to be sent to the facility 3 is calculated (S4).

  The total sewage input time is the target sewage treatment volume supplied to the denitrification tank 31 under the same operating conditions as the pump 3 operating condition when the sewage with the rated sewage treatment quantity is sent to the denitrification tank 31 using the pump P3. It is time necessary to do.

  Specifically, the total sewage input time (h / day) is obtained by dividing the target sewage treatment amount (kL / day) by the input flow rate (kL / h), and the input flow rate (kL / h) It is obtained as a value obtained by dividing the rated throughput (kL / day) by 24 hours.

  When it is the first operating state (S5, Y), when the time for transition to the second operating state is reached (S6, Y), the aeration apparatus 35 is operated (S7), and then the dissolved oxygen concentration in the nitrification tank 32 is predetermined. When the value exceeds the value (for example, 4 mg / L or more) (S8, Y), the pumps P3 to P8 are operated to complete the transition to the second operation state (S9).

  In step S5, if it is the second operating state (S5, N), the sewage charging total time has elapsed (S10, Y), the pumps P3 to P8 are stopped (S11), and then the dissolved oxygen in the nitrification tank 32 is reached. When the concentration becomes a predetermined value or more (for example, 4 mg / L or more) (S12, Y), the aeration device 35 is stopped, and the pretreatment device is further operated to complete the transition to the first operation state (S13). ).

  That is, the pump device is operated after the aerating device is operated for the second predetermined time by shifting to the second operating state at the time of shifting to the second operating state by the portion of the arithmetic device 62 that executes Step S7 to Step S9. The water supply delay control unit is configured to shift to the first operation state after elapse of the sewage charging total time from the transition time to the second operation state by the part that executes steps S11 to S13 in the computing device 62, and the pump An aeration delay control unit configured to stop the aeration apparatus after the first predetermined time has elapsed after the apparatus is stopped is configured.

  In addition, it replaces with the sensor which detects the dissolved oxygen concentration of the nitrification tank 32, and the timer which can set the time when dissolved oxygen concentration becomes a target value at the time of transfer to a 1st operation state or the shift to a 2nd operation state is provided. The water supply delay control unit and the aeration delay control unit may be configured to stop the aeration device when the timer counts up after stopping the pump device.

  The target sewage treatment amount per day is a value that varies depending on the season, etc., and is also a value that varies with the passage of time.For example, it may be changed periodically from a few months to a week. The transition time to the second operating state may be appropriately set according to the value. Moreover, when electric power becomes cheap in the midnight time slot | zone, you may provide the function to set automatically so that it may switch to a 2nd driving | running state in such a time slot | zone.

  When a simulation is performed on the sewage treatment plant to which the operation method according to the present invention is applied, the actual treatment amount is about 70% of the rated treatment amount, the first operation state is from 9:00 to 20:00 during the day, and The time was able to be in the second operating state. As a result, the total power consumption per day can be reduced by about 13% compared to the case of continuous operation for 24 hours by reducing the amount of water supplied by the pump device and the amount of aeration by the aeration device. The power consumption from 10:00 to 20:00 was reduced by about 26%.

  In the above-described example, the case where the transition time to the second operation state is input to the arithmetic device 62 in step S <b> 2 has been described, but the transition time to the first operation state may be input to the arithmetic device 62. In this case, what is necessary is just to transfer to a 2nd driving | running state at the transition time to the 2nd driving | running state calculated from the transfer time to the 1st driving | running state input into the input part, and sewage injection total time (S6). .

Next, another embodiment of the sewage treatment plant to which the operation method according to the present invention is applicable will be described.
FIG. 3 shows a sewage treatment plant 1A in which a standard denitrification treatment method is adopted. Here, since the basic configuration is the same as that of the sewage treatment plant 1 adopting the above-described septic tank sludge compatible denitrification method, different points will be described mainly.

  In the biological treatment facility 3A of the sewage treatment plant 1A, a denitrification tank 31A, a nitrification tank 32A, a secondary denitrification tank 33A, a re-aeration tank 34A, and a precipitation tank 37A are sequentially installed.

  The pre-dehydration device 24 that positively removes phosphorus and the like as described above is not provided, but a precipitation tank 37A is provided instead of the membrane separation device 36 provided in the re-aeration tank. And the high processing equipment 38A which removes phosphorus and COD from the supernatant liquid of the sedimentation tank 37A is provided. Part of the sludge accumulated in the settling tank 37A is returned to the denitrification tank 31 as return sludge by the pump P6a, transferred to the dehydrator 39A as excess sludge by the pump P7, dehydrated, and reduced in the sludge treatment facility 5A. Ru

  The advanced treatment equipment 38A includes a mixing tank 38a for adding and stirring an iron-based flocculant, a flocculant tank 38b for adding a flocculant made of a polymer, and agglomerating solids, and a target to be treated in which they are charged. A coagulation sedimentation tank 38c for precipitating water is provided. Part of the sludge accumulated in the coagulation sedimentation tank 38c is returned to the denitrification tank 31A as coagulation sludge by the pump P6b.

  Even in the sewage treatment plant 1A having such a configuration, the above-described operation method, operation control device, and control method can be applied.

  FIG. 4 shows a sewage treatment plant 1B in which a high load denitrification treatment method is adopted. In addition, here, the difference from the sewage treatment plant 1A in which the above-described standard denitrification treatment method is adopted will be mainly described.

  In the biological treatment facility 3B of the sewage treatment plant 1B, a deep reaction tank 31B, a nitrification tank 32B, a denitrification tank 33B, a re-aeration tank 34B, and a precipitation tank 37B are sequentially installed.

  The deep reaction tank 31B is a biological treatment tank having a depth of about 10 m, and a circulation pump tank 31a is continuously provided on the upper part thereof. A part of the sewage extracted from the circulation pump tank 31a by the pump P4B is circulated and supplied to the deep reaction tank 31B, and an ejector mechanism is incorporated in the circulation path so that air is supplied together with the circulated sewage.

  A valve is installed in the air supply path that communicates with the ejector mechanism, and the amount of air supplied together with the circulating sewage is adjusted by periodically controlling the opening of the valve so that an oxygen-free state is obtained in the deep reaction tank 31B. It can be switched between several hours at intervals of several hours. For example, the valve is opened and closed so as to repeat an anaerobic process for 1 hour and an aerobic process for 2 hours, and the anaerobic process and the aerobic process are repeated in a cycle of 3 hours.

  Since the depth of the deep reaction tank 31B is about twice as deep as that of the denitrification tank 31 having a depth of about 5 m, the water pressure is high near the tank bottom and the oxygen dissolution efficiency is high, so that high-efficiency processing can be performed. Therefore, it is not necessary to supply dilution water even if the load of the inflowing sewage is high.

  Even in the sewage treatment plant 1B having such a configuration, the above-described operation method, operation control device, and control method can be applied. In this case, when the deep reaction tank 31B is in an aerobic process (when the valve is open during the operation of the pump P4B), the process proceeds to the first operation state in which the pump P3 and the like are stopped, and the deep reaction tank 31B When the dissolved oxygen concentration exceeds a predetermined value, it is preferable to stop the valve closing and stop the supply of air via the ejector mechanism. At this time, the pump P4B may be stopped simultaneously.

  Further, when the deep reaction tank 31B is in the anaerobic process when the operation is shifted to the second operation state, first, the valve is opened and the supply of air through the ejector mechanism is restarted to dissolve the deep reaction tank 31B. It is preferable that the pump P3 and the like are controlled to operate after the oxygen concentration reaches a predetermined value or more. When the deep reaction tank 31B is aerobic, if the dissolved oxygen concentration in the deep reaction tank 31B is equal to or higher than a predetermined value, the pump P3 or the like may be operated immediately.

  That is, it is preferable to shift to the first operation state or shift to the second operation state when the deep reaction tank 31B is in the aerobic process.

  FIG. 5 shows a sewage treatment plant 1C in which a high load (membrane separation) denitrification treatment method is adopted. In addition, here, the points different from the sewage treatment plant 1B in which the above-described high-load denitrogenation method is adopted will be mainly described.

  In the biological treatment facility 3C of the sewage treatment plant 1C, a deep reaction tank 31C, a nitrification tank 32C, a denitrification tank 33C, and a re-aeration tank 34C are sequentially installed. The sedimentation tank 37B is not provided, and instead, the membrane separation device 36C is immersed in the re-aeration tank 34C.

  The advanced treatment facility 38C includes a mixing tank 38d for adding only an inorganic flocculant and an agglomerated membrane separation tank 38e in which a membrane separator is installed.

  Even in the sewage treatment plant 1C having such a configuration, the above-described operation method, operation control device, and control method can be applied. Also in this case, the control for switching to the first operation state and the second operation state depending on whether the deep reaction tank 31C is in the aerobic process or the anaerobic process is performed by the high load denitrification process described above. It is the same as that for the deep reaction tank 31B of the sewage treatment plant 1B in which the method is adopted.

  In the embodiment described above, in the first operation state in which the aeration apparatus and the pump device are stopped during a time period when the power demand is relatively large during the day, and during the time period when the power demand is relatively small during the day, The example of operating to switch between the second operation state in which the aeration device and the pump device are operated has been described, but when the aeration device and the pump device are operated in the rated operation state regardless of fluctuations in the power demand of the day. When the actual sewage treatment amount carried into the storage tank is smaller than the rated sewage treatment amount that can be biologically treated in a given time, the first operating state in which the aeration device and the pump device are stopped, and the aeration device is operated at the rating, The pump device is operated continuously or intermittently in the rated operation state so as to switch within a predetermined time to the second operation state in which the actual amount of sewage treatment is quantitatively sent to the biological treatment tank. Also good.

  As an operation control device for realizing such an operation method of a sewage treatment plant, an input unit for inputting a target sewage treatment amount per predetermined time and a transition time to the second operation state, and a preset unit time Based on the rated sewage treatment amount, the calculation unit that calculates the total sewage input time for sending the target sewage treatment amount to the biological treatment tank by the pump device, and the pump device is operated by shifting to the second operation state at the transition time What is necessary is just to provide the 2nd operation state control part and the 1st operation state control part which transfers to a 1st operation state after progress of sewage injection | throwing-in total time from a transfer time, and stops a pump apparatus.

  When the second operation state control unit is made to correspond to the above-described water supply delay control unit and the first operation state control unit is made to correspond to the above-described aeration delay control unit, the aeration operation or stop timing for the pump device is controlled in the same manner as described above. More preferred.

  In particular, when the aeration apparatus is operated for a long time without reaching the rating, it is more efficient to drive the aeration apparatus for a short time at the rating, and the power consumption can be reduced.

  Furthermore, as an operation control device that realizes such an operation method of the sewage treatment plant, an input unit that inputs a time zone for executing either the first operation state or the second operation state in one day, Based on a preset rated sewage treatment amount per unit time, a calculation unit that calculates the total amount of sewage that can be treated in the input time zone, and the first time zone in which the second operating state is executed Transition to the second operation state, the second operation state control unit for operating the aeration device and the pump device, the transition to the first operation state at the beginning of the time zone to execute the first operation state, It is also possible to comprise the aeration device and a first operation state control unit that stops the pump device.

  Once the rated sewage treatment amount per unit time and the time zone for executing either the first operating state or the second operating state are determined, the total amount of sewage can be calculated and the necessary processing is performed during the set time zone. Is done. When the total amount of sewage calculated by the calculation unit is less than the actual sewage treatment amount, a warning is displayed on the display unit to prompt resetting, or correction processing for correcting the set time zone to an appropriate time zone It is more preferable that a portion is provided.

  FIG. 6 shows a control procedure executed by the operation control apparatus. Initially, the sewage treatment plant 1 and the operation control device 6 are powered on, and the time period during which the operator performs the second operation state within the day via the input unit of the operation device 61 (this includes the start time) Is input to the computing device 62 (S11), the operation process is started (S12), and the computing device 62 can perform processing from the preset rated sewage treatment amount per unit time and the input time zone. The total amount of sewage is calculated (S13). If the calculated total amount of sewage input is less than the actual sewage treatment amount, it cannot be processed, so a warning message to that effect (for example, “Since the actual sewage treatment amount is large, it cannot be processed in time. Warning message such as “Please set again” and a message prompting the user to input again (S14, S15), and the process returns to step S11.

  When in the first operating state (S16, Y), when the time for transition to the second operating state is reached (S17, Y), the aeration apparatus 35 is operated (S18), and then the dissolved oxygen concentration in the nitrification tank 32 is predetermined. When the value exceeds the value (for example, 4 mg / L or more) (S19, Y), the pumps P3 to P8 are operated to complete the transition to the second operation state (S20).

  In step S16, if it is in the second operation state (S16, N), the passage of the set time zone is waited (S21, Y), the pumps P3 to P8 are stopped (S22), and then the nitrification tank 32 is dissolved. When the oxygen concentration becomes a predetermined value or more (for example, 4 mg / L or more) (S23, Y), the aeration apparatus 35 is stopped, and the pretreatment apparatus is further operated to complete the transition to the first operation state ( S24).

  Furthermore, as another operation control device, the start time of the first operation state and the second operation state, the input unit for inputting the target sewage treatment amount per day, and the second operation state calculated from each input start time The calculation unit that calculates the sewage treatment amount per unit time from the operating time of the plant and the target sewage treatment amount, and the calculated sewage treatment amount per unit time satisfy the preset rated sewage treatment amount per unit time In addition, a warning unit that outputs a warning for adjusting either the first operation state or the start time of the second operation state, the second operation state is shifted to the second operation state at the start time of the second operation state, A second operating state control unit that operates the pump device, and a first operating state control unit that shifts to the first operating state at the start time of the first operating state and stops the aeration device and the pump device. It is also possible to do.

  When the sewage treatment amount per unit time calculated by the calculation unit is different from the preset rated sewage treatment amount per unit time, the time required for the second operation state, which is originally required, may be excessive or insufficient. In such a case, the warning unit gives a warning for adjusting either the first operation state or the start time of the second operation state. The user can be prompted to input the setting again.

  Moreover, you may provide the correction | amendment part which adjusts either the 1st driving | running state and the start time of a 2nd driving | running state automatically so that it may be settled in the time required for the 2nd driving | running state originally required at this time.

  FIG. 7 shows a control procedure executed by the operation control apparatus. Initially, the sewage treatment plant 1 and the operation control device 6 are turned on, and the start times of the first and second operation states are input to the arithmetic device 62 via the input unit of the operation device 61 by the operator. When the target sewage treatment amount is input (S31, S32), the operation process is started (S33), and the calculation device 62 determines the time required for the target sewage treatment amount and the second operation state (the first and second operation states). The sewage treatment amount per unit time is calculated from (calculated from the start time) (S34).

  It is determined whether or not the calculated sewage treatment amount per unit time falls within a preset allowable range of the rated sewage treatment amount per unit time (S35, N). A warning message to that effect and a message prompting the user to input the time again are displayed (S36), and the process returns to step S31. The allowable range is a value set as appropriate, but in the present embodiment, it is set within a range of ± 10%.

  When the calculated sewage treatment amount per unit time falls within a preset allowable range of the rated sewage treatment amount per unit time (S35, Y), when in the first operation state (S37, Y) When the start time of the second operation state is reached (S38, Y), the aeration apparatus 35 is operated (S39), and then the dissolved oxygen concentration in the nitrification tank 32 becomes a predetermined value or more (for example, 4 mg / L or more) (S40). Y), the pumps P3 to P8 are operated to complete the transition to the second operation state (S41).

  In step S37, if it is in the second operation state (S37, N), after waiting for the set start time of the second operation state (S42, Y), the pumps P3 to P8 are stopped (S43), and then the nitrification tank When the dissolved oxygen concentration of 32 becomes a predetermined value or more (for example, 4 mg / L or more) (S44, Y), the aeration device 35 is stopped, and the pretreatment device is further operated to shift to the first operation state. Completion (S45).

  In step S35, when it is determined that the sewage treatment amount per unit time deviates from the preset allowable sewage treatment amount per unit time, a warning is displayed, or instead of the warning display, the unit It may be configured to automatically correct the input start times of the first and second operating states so that the sewage treatment amount per hour falls within a preset allowable range of the rated sewage treatment amount per unit time. Good.

  In this case, it may be configured to automatically correct both the start time of the first and second operation states for adjusting the operation time of the second operation state, or to automatically correct only one of the start times. You may comprise.

  The above-described embodiment is one aspect of the present invention, and the present invention is not limited by the description. Specific configurations and control aspects of each part can be appropriately changed and designed within the scope of the effects of the present invention. Needless to say.

1, 1A, 1B, 1C: Sewage treatment plant 2: Pretreatment equipment 21: Receiving tank 22: Removal apparatus 23: Prestorage tank 24: Predehydration apparatus 25: Storage tank 3: Biological treatment equipment 31: Denitrification tank 32 : Nitrification tank 33: Secondary denitrification tank 34: Re-aeration tank 35: Aeration apparatus 4: Post-treatment equipment 5: Sludge treatment equipment 6: Operation control device 61: Operating device 62: Computing device 63: Signal input / output device

Claims (12)

A storage tank for storing sewage, a biological treatment tank for biological treatment of sewage stored in the storage tank, a pump device for feeding sewage from the storage tank to the biological treatment tank, and aeration for aeration of the biological treatment tank An operation method of a sewage treatment plant including an apparatus,
A first operation state for stopping the pump device and the aeration device and a second operation state for operating the pump device and the aeration device are operated so as to be switched in a day.
At the time of transition from the second operation state to the first operation state, the stop time of the aeration device is delayed from the stop time of the pump device,
An operation method of a sewage treatment plant that delays an operation timing of the pump device from an operation timing of the aeration apparatus at the time of transition from the first operation state to the second operation state. From the pretreatment device for pretreating the sewage carried in, the storage tank for storing the sewage pretreated by the pretreatment device, the biological treatment tank for biologically treating the sewage stored in the storage tank, and the storage tank An operation method of a sewage treatment plant including a pump device for feeding sewage to the biological treatment tank and an aeration device for aeration of the biological treatment tank,
A first operation state in which the pretreatment device is operated and the pump device and the aeration device are stopped, and a second operation state in which the pretreatment device is stopped and the pump device and the aeration device are operated are Drive to switch in the day,
At the time of transition from the second operation state to the first operation state, the stop time of the aeration device is delayed from the stop time of the pump device,
An operation method of a sewage treatment plant that delays an operation timing of the pump device from an operation timing of the aeration apparatus at the time of transition from the first operation state to the second operation state. An operation control device for a sewage treatment plant that controls a pump device that feeds sewage from a storage tank that stores sewage to a biological treatment tank that biologically treats sewage, and an aeration device that aerates the biological treatment tank,
The pump device and the aeration device are operated so as to switch between the first operation state for stopping and controlling the pump device and the aeration device and the second operation state for controlling the operation of the pump device and the aeration device.
At the time of transition from the second operation state to the first operation state, the stop timing of the aeration device is delayed from the stop timing of the pump device,
An operation control device for a sewage treatment plant that delays and controls the operation timing of the pump device from the operation timing of the aeration apparatus when shifting from the first operation state to the second operation state. A pretreatment device that pretreats the sewage that has been carried in; a pump device that feeds the sewage from a storage tank that stores the sewage pretreated by the pretreatment device to a biological treatment tank that biologically treats the sewage; and the biological treatment tank An operation control device for a sewage treatment plant that controls an aeration device for aeration.
A first operation state for controlling the pretreatment device and controlling the stop of the pump device and the aeration device, and a second operation state for controlling the stop of the pretreatment device and controlling the operation of the pump device and the aeration device. Driving to switch between and
At the time of transition from the second operation state to the first operation state, the stop timing of the aeration device is delayed from the stop timing of the pump device,
An operation control device for a sewage treatment plant that delays and controls the operation timing of the pump device from the operation timing of the aeration apparatus when shifting from the first operation state to the second operation state. An operation control device for a sewage treatment plant according to claim 3 or 4,
An input unit for inputting a target sewage treatment amount per day and a transition time to the first or second operation state;
Based on a preset rated sewage treatment amount per unit time, a calculation unit that calculates the total sewage input time for feeding the target sewage treatment amount to the biological treatment tank by the pump device;
A transition to the second operation state at the transition time to the second operation state, and a water supply delay control unit that operates the pump device after operating the aeration device for a second predetermined time;
Aeration delay control for shifting to the first operation state after elapse of the sewage input total time from the transition time to the second operation state, stopping the pump device and stopping the aeration device after elapse of a first predetermined time And
An operation control device for a sewage treatment plant. A control method for a sewage treatment plant executed by the operation control device for a sewage treatment plant according to claim 3 or 4,
An input step for inputting a target sewage treatment amount per day and a transition time to the first or second operation state;
Based on a preset rated sewage treatment amount per unit time, a calculation step for calculating a total sewage input time for feeding the target sewage treatment amount to the biological treatment tank by the pump device;
A water supply delay control step of operating the pump device after operating the aeration device for a second predetermined time after shifting to the second operation state at the transition time to the second operation state,
Aeration delay control for shifting to the first operation state after elapse of the sewage input total time from the transition time to the second operation state, stopping the pump device and stopping the aeration device after elapse of a first predetermined time Steps,
A method for controlling a sewage treatment plant. In the input step, the dissolved oxygen concentration of the biological treatment tank is input,
The control method for a sewage treatment plant according to claim 6, wherein the first and second predetermined times are determined based on the dissolved oxygen concentration. A storage tank for storing sewage, a biological treatment tank for biological treatment of sewage stored in the storage tank, a pump device for feeding sewage from the storage tank to the biological treatment tank, and aeration for aeration of the biological treatment tank An operation method of a sewage treatment plant including an apparatus,
A first operation state in which the aeration apparatus and the pump device are stopped when the actual sewage treatment amount is smaller than the rated sewage treatment amount that can be biologically treated in a predetermined time when the aeration device is operated at a rated time; and the pump The sewage treatment that operates the apparatus so as to quantitatively feed the sewage of the actual sewage treatment amount to the biological treatment tank and to switch the second operation state in which the aeration apparatus is operated at a rated value within the predetermined time. How to operate the plant. An operation control device of a sewage treatment plant that controls a pump device that feeds sewage from a storage tank that stores sewage to a biological treatment tank that biologically treats sewage and an aeration device that aerates the biological treatment tank,
A first operation state in which the aeration apparatus and the pump device are stopped when the actual sewage treatment amount is smaller than the rated sewage treatment amount that can be biologically treated in a predetermined time when the aeration device is operated at a rated time; and the pump The sewage treatment that operates the apparatus so as to quantitatively feed the sewage of the actual sewage treatment amount to the biological treatment tank and to switch the second operation state in which the aeration apparatus is operated at a rated value within the predetermined time. Plant operation control device. An operation control device for a sewage treatment plant according to claim 9,
An input unit for inputting the target sewage treatment amount per predetermined time and the transition time to the first or second operation state;
Based on a preset rated sewage treatment amount per unit time, a calculation unit that calculates the total sewage input time for feeding the target sewage treatment amount to the biological treatment tank by the pump device;
A second operation state control unit that moves to the second operation state at the time of transition to the second operation state and operates the aeration apparatus and the pump device;
A first operation state control unit for shifting to the first operation state after the sewage charging total time has elapsed from the transition time to the second operation state, and stopping the aeration apparatus and the pump device;
An operation control device for a sewage treatment plant. An operation control device for a sewage treatment plant according to claim 9,
An input unit for inputting a time zone for executing either the first or the second operation state in one day;
Based on a preset rated sewage treatment amount per unit time, a calculation unit that calculates a sewage total amount that calculates a sewage total amount that can be treated in an input time zone; and
A second operation state control unit for operating the aeration apparatus and the pump device by shifting to the second operation state at the beginning of the time period for executing the second operation state;
A first operating state control unit that shifts to the first operating state at the beginning of the time period for executing the first operating state, and stops the aeration apparatus and the pump device;
An operation control device for a sewage treatment plant. An operation control device for a sewage treatment plant according to claim 9,
An input unit for inputting the start time of the first and second operation states, and a target sewage treatment amount per day;
A calculation unit that calculates a sewage treatment amount per unit time from the operation time of the second operation state calculated from each input start time and the target sewage treatment amount;
A warning is output to adjust any of the start times of the first and second operating states so that the calculated sewage treatment amount per unit time satisfies a preset rated sewage treatment amount per unit time. A warning section;
A second operation state control unit that moves to the second operation state at the start time or correction time of the second operation state and operates the aeration apparatus and the pump device;
A first operation state control unit that shifts to the first operation state at the start time or correction time of the first operation state and stops the aeration apparatus and the pump device;
An operation control device for a sewage treatment plant.