JP2021013891A - Operation support device of water treatment plant - Google Patents

Abstract

To provide an operation support device of a water treatment plant which estimates a time (time passage of treatment) from an inflow of water to be treated into the water treatment plant to an outflow of the water to be treated from the water treatment plant and displays an operation history to an operation manager.SOLUTION: An operation support device of a water treatment plant according to the present invention is an operation support device of a water treatment plant with a treatment step of treating water to be treated. The operation support device uses an estimation value of: an inflow water amount estimation unit which estimates a flow rate of inflow water flowing into the treatment step; an operation index estimation unit which estimates an operation index for the treatment step; and a treated water quality estimation unit which estimates water quality of outflow water flowing out of the treatment step (including a middle (course) of the treatment step. The same applies hereinafter.). The operation support device comprises an operation information display unit which displays the estimation value of the treated water quality estimation unit and the estimation value of the operation index estimation unit in a predetermined period (in a past) calculated on the basis of the estimation value of the inflow water amount estimation unit, with the estimation values of the treated water quality estimation unit and the operation index estimation unit being associated with each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to an operation support device for a water treatment plant.

Water purification plants and sewage treatment plants are the infrastructure that supports the city's water cycle.

At water purification plants, water is generally taken from rivers, etc., and after coagulation sedimentation, filtration, and disinfection, it is supplied to customers as tap water. On the other hand, at the sewage treatment plant, solid content removal in sand basins and first sedimentation basins, removal of organic substances and nitrogen by activated sludge in biological reaction tanks, sedimentation separation of activated sludge in final sedimentation basins, and effluent flowing out from final sedimentation basins. After each treatment of disinfection, it is discharged to public water areas such as rivers.

In such water purification plants and sewage treatment plants, in addition to satisfying water quality standards, these treatments are required to suppress excessive energy consumption and excessive chemical consumption. However, as the number of skilled driving managers decreases, driving assistance technology is required to realize stable and efficient driving. In particular, it is important to deal with abnormalities such as deterioration of treated water quality.

As a background technology in this technical field, there is Japanese Patent Application Laid-Open No. 2018-118184 (Patent Document 1). This Patent Document 1 includes a first settling pond, a reaction tank for treating the water to be treated flowing from the first settling pond with activated sludge, a final settling pond, and a flow control valve, and the flow rate of the water to be treated flowing into the reaction tank. The upper limit of the flow rate of the water to be treated flowing into the reaction tank is calculated based on the measured values of the activated sludge concentration measured by the flow meter, the MLSS meter that measures the activated sludge concentration in the reaction tank, and the MLSS meter. A water treatment system (water treatment plant) having a flow rate upper limit value calculation unit and a water treatment control device having a flow rate adjustment valve opening control unit that controls the opening degree of the flow rate adjustment valve so as not to exceed the flow rate upper limit value. , Described (see summary).

JP-A-2018-118184

Patent Document 1 describes a water treatment plant having a first settling basin, a reaction tank for treating the water to be treated flowing from the first settling basin with activated sludge, and a final settling basin.

However, Patent Document 1 does not describe a water treatment plant that displays an operation history to an operation manager in consideration of a time delay (elapsed time of treatment) of the water to be treated flowing into the water treatment plant.

Therefore, the present invention estimates the time until the water to be treated that has flowed into the water treatment plant flows out of the water treatment plant (elapsed time of treatment), and displays the operation history to the operation manager to support the operation of the water treatment plant. Provide the device.

In order to solve the above problems, the operation support device of the water treatment plant of the present invention is an operation support device of a water treatment plant having a treatment process for treating the water to be treated, and the flow rate of the inflow water flowing into the treatment process. The inflow water amount estimation unit that estimates the inflow water amount, the operation index estimation unit that estimates the operation index related to the treatment process, and the water quality of the outflow water that flows out from the treatment process (including the middle (process) of the treatment process. The same applies hereinafter). Using the estimated values in the treated water quality estimation unit, the estimated values in the treated water quality estimation unit correspond to the estimated values in the operation index estimation unit for a predetermined period (past) calculated based on the estimated values in the inflow water volume estimation unit. It is characterized by having an operation information display unit to be attached and displayed.

According to the present invention, the operation support of a water treatment plant that estimates the time until the water to be treated that has flowed into the water treatment plant flows out of the water treatment plant (elapsed time of treatment) and displays the operation history to the operation manager. Equipment can be provided.

Issues, configurations and effects other than those described above will be clarified by the following description of Examples.

It is a block diagram explaining the structure of the water treatment plant described in Example 1. FIG. FIG. 5 is a determination flow chart for determining an operation abnormality or a sign of an operation abnormality described in the first embodiment. It is explanatory drawing explaining the display example in the operation information display part 17 described in Example 1. FIG. It is a block diagram explaining the structure of the water treatment plant described in Example 2. It is explanatory drawing explaining the display example in the operation information display part 17 described in Example 2. FIG.

Hereinafter, examples of the present invention will be described with reference to the drawings. In addition, substantially the same or similar configurations are designated by the same reference numerals, and when the explanations are duplicated, the explanations may be omitted.

First, the configuration of the water treatment plant described in Example 1 will be described.

FIG. 1 is a configuration diagram illustrating the configuration of the water treatment plant described in the first embodiment.

The water treatment plant described in Example 1 has a treatment step for treating water to be treated, and is a sewage treatment plant that uses a standard activated sludge method as a water treatment method, and uses activated sludge. To remove organic substances and nitrogen.

The water treatment plant described in Example 1 has a first settling basin 1, an aerobic tank 2 which is a form of a reaction tank, and a final settling basin 3.

First, the sewage 100 flows into the settling basin 1, the solid content of the sewage 100 is settled and separated, and a part or all of the supernatant water flows into the aerobic tank 2 as the aerobic tank inflow water 101. A part of the supernatant water may be discharged into a public water area such as a river after being treated as a simple treated water 102 by disinfection or the like.

The aerobic tank inflow water 101 and the returned sludge 103 flow into the aerobic tank 2, and the organic matter is oxidized by the aerobic heterotrophic bacteria in the activated sludge, and the nitrifying bacteria in the activated sludge are ammonialic. Nitrification is performed in which nitrogen is oxidized to nitrate nitrogen. Further, an air diffuser 4 is installed in the aerobic tank 2, a blower 5 is connected to the air diffuser 4, and air is supplied to the air diffuser 4.

The final sedimentation basin 3 sediments and separates the supernatant water and the activated sludge. The supernatant water after sedimentation separation is treated as treated water 104 and is discharged to a public water area such as a river after undergoing treatment such as disinfection. Further, a part of the activated sludge after sedimentation separation is returned to the aerobic tank 2 by the return pump 6 as the return sludge 103, and is used again for biological treatment. The remaining activated sludge after sedimentation separation is transferred to sludge treatment by the surplus sludge pump 7 as surplus sludge 105.

In Example 1, a water treatment plant using the standard activated sludge method is targeted. However, in the case of a water treatment plant having a reaction tank and a final settling basin 3, such as a water treatment method such as an anaerobic aerobic activated sludge method or a circulating nitrification denitrification method, the technique described in Example 1 can be applied. Can be used.

Further, in Example 1, the aerobic tank 2 in the sewage treatment is targeted. However, for example, the technique described in Example 1 can also be used in the final settling basin 3 in the sewage treatment and the subsequent disinfection treatment step.

In Example 1, the treatment step is a water treatment step in the aerobic tank 2, but it may be a series of water treatment steps in the first settling basin 1, the aerobic tank 2, and the final settling basin 3. The water treatment steps in the first settling basin 1, the aerobic tank 2, and the final settling basin 3 may be performed, or in the water treatment step before the first settling basin 1 or the water treatment step after the final settling basin 3. There may be.

The operation support device of the water treatment plant described in the first embodiment is composed of an inflow water amount estimation unit that estimates the flow rate of the inflow water flowing into the treatment process, an operation index estimation unit that estimates an operation index related to the treatment process, and a treatment process. It has a treated water quality estimation unit that estimates the quality of the outflow water, and uses these estimated values.

In the flow path connecting the first settling basin 1 and the aerobic tank 2, a flow meter 8 for measuring the flow rate of the aerobic tank inflow water 101 and a first ammonia meter 9 for measuring the ammonia concentration of the aerobic tank inflow water 101 And are installed. That is, the flow meter 8 measures the flow rate of the aerobic tank inflow water 101, and the first ammonia meter 9 measures the ammonia concentration of the aerobic tank inflow water 101.

Further, in the aerobic tank 2, a DO total 10 for measuring the DO (Dissolved Oxygen) concentration of the aerobic tank 2 and a second ammonia total 11 for measuring the ammonia concentration of the aerobic tank 2 are installed. Will be done. That is, the DO concentration of the aerobic tank 2 is measured by the DO meter 10, and the ammonia concentration of the aerobic tank 2 is measured by the second ammonia meter 11.

Further, a return flow meter 12 for measuring the flow rate of the return sludge 103 is installed in the flow path of the return sludge 103. That is, the return flow meter 12 measures the flow rate of the return sludge 103, which is an operation amount related to the processing process.

Further, in the flow path connecting the blower 5 and the air diffuser 4, an air volume meter 13 for measuring the air volume of the air supplied to the aerobic tank 2 is installed. That is, the air volume meter 13 measures the air volume of the air supplied to the aerobic tank 2, which is the operation amount related to the processing process.

In the first embodiment, the flow meter 8 is used as the inflow water amount estimation unit, the first ammonia meter 9, the DO total 10, the return flow rate meter 12, and the air volume meter 13 are used as the operation index estimation unit, and the second ammonia is used as the treated water quality estimation unit. A total of 11 will be installed.

Further, as a treated water quality estimation unit, an SS (Suspended Solid) concentration meter 19 is installed on the downstream side of the final settling basin 3 to measure the SS concentration of the treated water 104.

In Example 1, as the treated water quality estimation unit, a second ammonia meter 11 for measuring the ammonia concentration (water quality item) of the aerobic tank 2 and an SS concentration meter 19 for measuring the SS concentration of the treated water 104 are used. Although it is installed, a measuring instrument for measuring other water quality items (for example, the total nitrogen concentration of the treated water 104) may be installed.

In the first embodiment, the flow meter 8 is first installed in the flow path connecting the settling basin 1 and the aerobic tank 2, and the flow rate of the aerobic tank inflow water 101 is measured. However, for example, a flow meter is installed on the upstream side of the first settling basin 1 to measure the flow rate of the sewage 100, and the amount of drawn sludge (solid content) drawn from the first settling basin 1 and the flow rate of the simple treated water 102. The flow rate of the aerobic tank inflow water 101 may be estimated (calculated) from the flow rate of the sewage 100, the amount of drawn sludge, and the flow rate of the simple treated water 102.

That is, the inflow water amount estimation unit measures the flow rate of the aerobic tank inflow water 101, or estimates the flow rate of the aerobic tank inflow water 101.

In the first embodiment, the first ammonia meter 9 is first installed in the flow path connecting the settling basin 1 and the aerobic tank 2, and the ammonia concentration of the aerobic tank inflow water 101 is measured. However, for example, even if the first ammonia meter is installed in the aerobic tank 2 on the upstream side of the second ammonia meter 11 and the ammonia concentration in the aerobic tank 2 on the upstream side of the second ammonia meter 11 is measured. Good. Further, in the case of a water treatment system in which an anaerobic tank or anoxic tank is installed on the upstream side of the aerobic tank 2, the first ammonia meter is installed in the anaerobic tank or the oxygen-free tank, and the anaerobic tank or the oxygen-free tank is installed. The ammonia concentration in the tank may be measured.

In Example 1, the first ammonia total 9, the DO total 10, the return flow rate meter 12, and the air volume meter 13 were used to determine the ammonia concentration of the aerobic tank inflow water 101, the DO concentration of the aerobic tank 2, and the flow rate of the return sludge 103. , The air volume of the air supplied to the aerobic tank 2 is measured respectively, but these may be estimated by a predetermined method. That is, the driving index estimation unit estimates these driving indexes.

The operation index estimated by the operation index estimation unit includes the water quality of the water to be treated (inflow water) (for example, the ammonia concentration of the aerobic tank inflow water 101) and the operation amount related to the treatment process (for example, the flow rate of the returned sludge 103). , The air volume of the air supplied to the aerobic tank 2, the calculated value by a model that reproduces the treatment process (for example, a sludge sedimentation model, an activated sludge model, etc.), the amount of rainfall, and the like.

In the first embodiment, the second ammonia meter 11 is installed in the aerobic tank 2 and the ammonia concentration in the aerobic tank 2 is measured. However, for example, a second ammonia meter may be installed on the downstream side of the aerobic tank 2 to measure the ammonia concentration of the effluent flowing out of the aerobic tank 2.

In Example 1, the ammonia concentration in the aerobic tank 2 is measured by the second ammonia meter 11, but these may be estimated by a predetermined method. That is, the treated water quality estimation unit estimates the treated water quality.

The operation support device of the water treatment plant described in the first embodiment preferably has an operation abnormality detection unit 14, an operation abnormality period estimation unit 15, an operation information storage unit 16, and an operation information display unit 17.

The operation abnormality detection unit 14 is connected to the second ammonia meter 11, and is connected to the ammonia concentration of the aerobic tank 2 (measured value: estimated value in the treated water quality estimation unit) and a preset reference value of the ammonia concentration of the aerobic tank 2. Compare with (control standard value) and detect driving abnormality or signs of driving abnormality.

In the first embodiment, the operation abnormality detection unit 14 compares the measured value measured by the second ammonia meter 11 with the control reference value to determine the presence or absence of an operation abnormality or a sign of the operation abnormality. However, the time change amount of the measured value measured by the second ammonia meter 11 may be compared with the control reference value, or other measured water quality items may be used for comparison.

The operation abnormality period estimation unit 15 is connected to the flow meter 8, the return flow meter 12, and the operation abnormality detection unit 14. Then, the time when the operation abnormality detection unit 14 detects an operation abnormality or a sign of the operation abnormality, the flow rate of the aerobic tank inflow water 101 (estimated value in the inflow water amount estimation unit), and the flow rate of the returned sludge 103 (operation index estimation unit). Estimated value in) and, based on, the abnormal operation arrival period is estimated.

Here, the abnormal operation arrival period is, for example, when an operation abnormality in which the ammonia concentration of the aerobic tank 2 exceeds the control reference value is detected, the aerobic tank inflow water 101 flowing into the aerobic tank 2 is aerobic. It is a period between the time when the water flows into the tank 2 and the time when the aerobic tank inflow water 101 reaches the installation position of the second ammonia meter 11 (the time when the second ammonia meter 11 detects an operation abnormality). ..

The operation information storage unit 16 includes a flow meter 8, a first ammonia meter 9, a DO meter 10, a second ammonia meter 11, a return flow meter 12, an air volume meter 13, an abnormal operation period estimation unit 15, and the like. Be connected. Then, the operation information in the abnormal operation arrival period estimated by the abnormal operation period estimation unit 15 is stored together with the operation abnormality information (for example, the information of the operation abnormality in which the ammonia concentration of the aerobic tank 2 exceeds the control reference value). .. The operation information storage unit 16 also stores operation information in a normal operation period other than the abnormal operation period as operation normal information.

Further, the operation support device of the water treatment plant described in the first embodiment has an operation abnormality detection unit 14 that detects an operation abnormality or a sign of an operation abnormality in the treatment process based on an estimated value in the treated water quality estimation unit, and an operation abnormality detection unit. When the unit 14 detects an operation abnormality or a sign of an operation abnormality, the operation abnormality period estimation unit 15 that estimates the operation abnormality arrival period in the processing process based on the estimated value in the inflow water amount estimation unit, and the operation abnormality period estimation unit 15 It has a driving information storage unit 16 that stores driving information included in the driving abnormality arrival period (estimated period) estimated in the above.

The operation information display unit 17 is connected to the operation information storage unit 16, and among the operation information stored in the operation information storage unit 16, the water quality item estimated by the treated water quality estimation unit (in the first embodiment, the aerobic tank 2). Ammonia concentration), an appropriate item (in Example 1, the ammonia concentration of the aerobic tank inflow water 101, the air volume of the air supplied to the aerobic tank 2) is selected and displayed.

When the treated water quality estimation unit measures water quality items other than the second ammonia meter 11 that measures the ammonia concentration in the aerobic tank 2, the operation information display unit 17 corresponds to the measured water quality items. Can automatically select display items.

That is, the operation information display unit 17 selects and displays the display items related to the operation index estimation unit according to the water quality items estimated by the treated water quality estimation unit.

Further, the operation information display unit 17 is the operation information stored in the operation information storage unit 16, and is a treated water quality estimation unit for at least one of the estimated value in the inflow water amount estimation unit and the estimated value in the operation index estimation unit. The relationship with the estimated value in.

Further, the operation information display unit 17 displays the start time of the abnormal operation period in order to compare the normal operation state and the abnormal operation state (the state of detecting the operation abnormality or the sign of the operation abnormality), and displays the abnormal operation period and the abnormality. The water quality items and the appropriate items to be selected in the normal operation period (the period retroactive from the start time of the abnormal operation period) other than the operation period are displayed.

The predetermined time is either a fixed value, a value obtained by multiplying the abnormal operation period by a constant magnification, or a value obtained by multiplying the average residence time (hydraulic residence time or solid matter residence time) by a constant magnification. is there.

That is, the operation support device of the water treatment plant described in the first embodiment has an inflow water amount estimation unit (flow meter 8) for estimating the flow rate of the aerobic tank inflow water 101 and an operation index (ammonia of the aerobic tank inflow water 101). Operation index estimation unit (first ammonia total 9, DO total 10, return flow rate meter 12) that estimates the concentration, DO concentration of the aerobic tank 2, the flow rate of the returned sludge 103, the air volume of the air supplied to the aerobic tank 2. , Estimated value (measured value) in the air volume meter 13) and the treated water quality estimation unit (second ammonia meter 11) that estimates the water quality of the effluent flowing out of the aerobic tank 2 (ammonia concentration in the aerobic tank 2). To use.

The operation support device for the water treatment plant described in Example 1 includes an estimated value (ammonia concentration in the aerobic tank 2) in the treated water quality estimation unit (second ammonia meter 11) and an inflow water amount estimation unit (flow meter 8). ) Is calculated based on the estimated value (flow rate of the aerobic tank inflow water 101), and the operation index estimation unit (first ammonia meter 9, DO total 10, return flow meter 12, air volume meter 13) in a predetermined period (operation abnormality arrival period). ) (Ammonia concentration of aerobic tank inflow water 101, DO concentration of aerobic tank 2, flow rate of returned sludge 103, air volume of air supplied to aerobic tank 2) are displayed in association with each other. It has an operation information display unit 17.

As described above, in a water treatment plant, in particular, the residence time in the treatment process, that is, the passage of time from inflow to outflow is greatly affected by the amount of inflow water, so it is necessary to consider fluctuations in the amount of inflow water.

According to the first embodiment, the time delay of the water to be treated (elapsed time of treatment) flowing into the water treatment plant is estimated based on the amount of inflow water, and the operation history of the water treatment plant is displayed to the operation manager. Equipment can be provided.

In other words, the relationship between the quality of the water to be treated flowing into the water treatment plant, the operation history such as the cumulative value of the chemical injection amount and the blower air volume, and the treatment result such as the treated water quality is considered in consideration of the abnormal operation arrival period. The normal operation period and the abnormal operation period are displayed so that they can be compared. As a result, the operation manager can grasp the improvement points of the operation conditions such as the insufficient amount of the chemical injection amount and the blower air flow amount.

Moreover, in Example 1, sewage treatment is targeted. However, the technique described in Example 1 can also be used for water purification treatment in the water supply. For example, the water purification treatment has a coagulation / precipitation treatment step, and the treated water quality estimation unit in the water purification treatment estimates the turbidity after the coagulation / precipitation as water quality, and the operation amount in the treatment step is the injection amount of the coagulant. ..

Next, the determination flow for determining the operation abnormality or the sign of the operation abnormality described in the first embodiment will be described.

FIG. 2 is a determination flow diagram for determining an operation abnormality or a sign of an operation abnormality described in the first embodiment.

The flow of determining the operation abnormality or the sign of the operation abnormality in the operation abnormality detection unit 14 will be described. In Example 1, the excess of the control standard value of the ammonia concentration in the aerobic tank 2, that is, the poor removal of ammonia is defined as an operation abnormality.

First, in S101, a control reference value ( _CN2s ) for the ammonia concentration in the aerobic tank 2 is set.

Next, in S102, the measured value ( _CN2m ) of the ammonia concentration in the aerobic tank 2 by the second ammonia meter 11 is acquired.

Next, in S103, compares control reference value of the ammonia concentration in the aerobic tank 2 _{(C N2s)} and the measured value and _{(C N2m).} When the measured value ( _CN2m ) is equal to or higher than the control reference value ( _CN2s ) (YES), it is determined that there is an operation abnormality or a sign of an operation abnormality (S104). On the other hand, when the measured value ( _CN2m ) is smaller than the control reference value ( _CN2s ) (NO), it is determined that there is no sign of operation abnormality or operation abnormality (S105).

In the case of S105, it is verified whether or not there is an operation abnormality or a sign of an operation abnormality for other measured water quality items.

Further, a method of estimating the abnormal operation arrival period in the abnormal operation period estimation unit 15 will be described.

The time from the inflow to the aerobic tank 2 to the outflow can be calculated based on the cumulative value of the total value of the flow rate of the aerobic tank inflow water 101 and the flow rate of the returned sludge 103. The conditional expression related to the calculation is shown in equation (1).

In the formula (1), the cumulative value from the past of the total value of the flow rate of the aerobic tank inflow water 101 and the flow rate of the returned sludge 103 is added, and the minimum k that is equal to or larger than the volume of the aerobic tank 2 is abnormal. Estimate the start time of the driving arrival period.

The time t is the time when the operation abnormality detection unit 14 detects the operation abnormality or the sign of the operation abnormality, and is the end time of the abnormal operation arrival period estimated by the abnormality operation period estimation unit 15.

Qin (tn · Δt) (m ³ / h) is the flow rate of the aerobic tank inflow 101 at time tn · Δt, and Qr (tn · Δt) (m ³ / h) is The flow rate of the returned sludge 103 at time tn · Δt, Δt (h) is the calculation cycle, V (m ³ ) is the volume of the aerobic tank 2, and n and k are variables.

Thereby, the abnormal operation arrival period can be estimated.

Next, a display example in the operation information display unit 17 described in the first embodiment will be described.

FIG. 3 is an explanatory diagram illustrating a display example in the operation information display unit 17 described in the first embodiment.

The operation information display unit 17 displays operation information in a normal operation period other than the abnormal operation period and the abnormal operation period.

That is, the operation information display unit 17 abnormally changes the water quality item (in the first embodiment, the ammonia concentration of the aerobic tank 2) estimated by the treated water quality estimation unit among the operation information stored in the operation information storage unit 16. Display the normal operation period other than the operation period and abnormal operation period.

Then, the operation information display unit 17 sets an appropriate item (in Example 1, the ammonia concentration of the aerobic tank inflow water 101) according to the displayed water quality item (in Example 1, the ammonia concentration of the aerobic tank 2). , The amount of air supplied to the aerobic tank 2) is selected and displayed for the abnormal operation period and the normal operation period other than the abnormal operation period.

That is, in Example 1, since the operation abnormality is defined as poor removal of ammonia, the ammonia concentration in the aerobic tank 2 is displayed as the treatment result, and the inflow water 101 in the aerobic tank is used as a factor influencing the removal of ammonia. The ammonia concentration and the air volume of the air supplied to the aerobic tank 2 are displayed.

As other factors affecting the removal of ammonia, the DO concentration of the aerobic tank 2, the activated sludge (MLSS: Mixed Liquor Suspended Solids) concentration of the aerobic tank 2, and the water temperature of the aerobic tank 2 may be displayed. ..

The displayed water quality item (in Example 1, the ammonia concentration in the aerobic tank 2) is the current value, and among the appropriate items, the ammonia concentration in the aerobic tank inflow water 101 is the aerobic tank inflow water. 101 is a value at a time when it flows into the aerobic tank 2, and among appropriate items, the air volume of air supplied to the aerobic tank 2 is a cumulative value (total value).

That is, the measured value (inflow to the aerobic tank) measured by the first ammonia meter 9 is based on the measurement time of the measured value (ammonia concentration in the aerobic tank 2) measured by the second ammonia meter 11 displayed as the processing result. Regarding (ammonia concentration of water 101), the value at the time when the aerobic tank inflow water 101 flows into the aerobic tank 2 is displayed, and the measured value measured by the air volume meter 13 (the air supplied to the aerobic tank 2). For (air volume), the cumulative value of the air volume of the air supplied to the aerobic tank 2 in a predetermined period (operation abnormality arrival period) is displayed.

Here, the predetermined period (operation abnormality arrival period) is a favorable period in which the aerobic tank inflow water 101 flows into the aerobic tank 2 from the time when the aerobic tank 2 flows into the aerobic tank 2 (supply time to the aerobic tank 2). It is until the arrival time until the air tank inflow water 101 reaches the installation position of the second ammonia meter 11.

In addition, the estimated values (ammonia concentration of aerobic tank inflow water 101, DO concentration of aerobic tank 2, return sludge) in the operation index estimation unit (1st ammonia total 9, DO total 10, return flow meter 12, air volume meter 13). A predetermined period (operation abnormality reached) calculated based on the estimated value (flow rate of the aerobic tank inflow water 101) by the inflow water amount estimation unit (flow meter 8) for the flow rate of 103 and the air volume of the air supplied to the aerobic tank 2. Period), at least one of the total value in any period or the average value in any period and the value at any time.

In the first embodiment, in the operation information display unit 17, the measured value by the air volume meter 13 is the cumulative value of the air volume of the air supplied to the aerobic tank 2, but the air volume is distributed according to the position of the aerobic tank 2. If the ratios are different, the cumulative value of the air volume may be calculated based on the distribution ratio of the air volume and the assumed position of the aerobic tank inflow water 101 flowing into the aerobic tank 2.

In this way, by considering the period from the start time to the arrival time, the time until the treated water flowing into the water treatment plant flows out of the water treatment plant (elapsed treatment time) is estimated, and the operation manager The operation history can be displayed on.

The estimation of the period from the start time to the arrival time is the same as the estimation of the abnormal operation arrival period in the abnormal operation period estimation unit 15.

Further, the time zone in which the measured value measured by the second ammonia meter 11 exceeds the control reference value is displayed as an abnormal operation period.

As a result, the operation manager can see that the cumulative value of the air volume of the air supplied to the aerobic tank 2 is low even though the ammonia concentration of the aerobic tank inflow water 101 is high during the abnormal operation period.

This is because the blower 5 is controlled according to the ammonia concentration of the aerobic tank inflow water 101, and the air volume of the air supplied to the aerobic tank 2 is adjusted, but the air supplied to the aerobic tank 2 is adjusted. Indicates that the air volume (cumulative value) is insufficient and the treated water quality deteriorates.

That is, by displaying the relationship between the operation history and the treatment result such as the treated water quality so that the normal operation period and the abnormal operation period can be compared in consideration of the abnormal operation arrival period, the operation manager can compare. It is possible to grasp the improvement points of the operating conditions such as insufficient blower air volume.

In addition to real-time trend data (measured value measured by the second ammonia meter 11), the water quality at the time of inflow of the inflow water flowing into the treatment process (aerobic tank 2), and the cumulative amount of operation in the treatment process. By displaying the value, the processing history from the inflow to the outflow can be tracked, the factors of the change in the treated water quality can be efficiently grasped, and the improvement points of the operating conditions can be grasped.

Further, the operation support device of the water treatment plant described in the first embodiment has an operation condition setting unit for setting at least one control set value or control reference value among the operation amounts in the treatment process.

By having an operation condition setting unit for setting a control set value or a control reference value, it is possible to determine an appropriate and efficient operation condition for avoiding a processing abnormality. In addition, control settings such as the amount of operation and driving support information such as management standards can be derived.

As described above, according to the first embodiment, the water quality of the water to be treated at the time of inflow into the water treatment plant, the operation history such as the cumulative value of the chemical injection amount and the blower air flow amount, and the treatment result such as the treated water quality. Can be compared and displayed between the normal operation period and the abnormal operation period.

As a result, the operation manager can grasp the improvement points of the operation conditions such as the insufficient amount of the chemical injection amount and the blower air flow amount.

Then, in a water treatment plant whose treatment characteristics greatly change depending on the flow rate and water quality of the inflow water, the operation history can be displayed and the operation support information can be provided in consideration of the time delay from the inflow to the outflow.

Next, the configuration of the water treatment plant described in Example 2 will be described.

FIG. 4 is a configuration diagram illustrating the configuration of the water treatment plant described in the second embodiment.

In the water treatment plant described in Example 2, an MLSS concentration meter 18 is installed in the aerobic tank 2 as an operation index estimation unit as compared with the water treatment plant described in Example 1, and the MLSS concentration in the aerobic tank 2 is installed. To measure.

Then, the operation abnormality detection unit 14 is connected to the SS concentration meter 19 and inputs the SS concentration of the treated water 104. The operation information storage unit 16 is connected to the MLSS concentration meter 18 and inputs the MLSS concentration of the aerobic tank 2, and is connected to the SS concentration meter 19 and inputs the SS concentration of the treated water 104.

That is, in the second embodiment, as compared with the first embodiment, the operation abnormality detection unit 14 inputs the SS concentration of the treated water 104 instead of inputting the ammonia concentration of the aerobic tank 2, and the operation information storage unit 16 Instead of inputting the blower air volume, the DO concentration of the aerobic tank 2, and the ammonia concentration of the aerobic tank 2, the MLSS concentration of the aerobic tank 2 and the SS concentration of the treated water 104 are input.

In Example 2, a sludge settling step in the final settling basin 3 is assumed as a treatment step.

That is, in Example 2, an abnormality or a sign of an abnormality in the SS concentration of the treated water 104 is detected. The flow of the same flow as in Example 1 (FIG. 2) is followed for the determination of the poor sedimentation property of the activated sludge in the final sedimentation basin 3.

Next, a display example in the operation information display unit 17 described in the second embodiment will be described.

FIG. 5 is an explanatory diagram illustrating a display example in the operation information display unit 17 described in the second embodiment.

In the first embodiment, the operation information display unit 17 showed trend data of the water quality at the time of inflow and outflow in the aerobic tank 2 and the operation amount from the inflow to the outflow. In the second embodiment, in particular, the display is performed to support the state determination by comparison with the past driving information and the setting of the management reference value.

Hereinafter, the differences from the first embodiment will be described.

In the second embodiment, among the operation information stored in the operation information storage unit 16, the relationship between the cumulative value of the inflow water amount of the treated water from the inflow to the outflow of the final settling basin 3 and the SS concentration of the treated water 104 is the latest. The operation information of the above and the past operation information in the same range as the latest MLSS concentration are shown.

The reason for extracting the operation data in the same range as the latest MLSS concentration is that the MLSS concentration is a factor that affects the sedimentation property of the activated sludge, and the comparison is made in the range in which the sedimentation property of the activated sludge is the same. Because.

The operation information may be extracted on the condition of the water temperature of the final settling basin 3 and SVI (activated sludge capacity index), which are factors that affect the sedimentation property of other activated sludge. Further, a plurality of types of information such as MLSS concentration, water temperature, and SVI may be classified by a clustering method, and past operation information corresponding to the same cluster as the latest may be extracted and displayed.

In FIG. 5, it can be seen that the SS concentration of the treated water 104 increases with a smaller amount of inflow water as compared with the past operation. For example, when setting the control reference value of the inflow water amount, the inflow water amount is managed. The operation manager can understand the necessity of lowering the reference value, and can set appropriate operation conditions. In addition, emergency measures such as increasing the injection amount of the coagulant or suppressing the amount of water flowing into the final settling basin 3 (aerobic tank 2) to improve the settling capacity of activated sludge can be adopted. ..

The present invention is not limited to the above-mentioned examples, and includes various modifications. For example, the above-described embodiment has been specifically described in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with a part of the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace a part of the other configurations with respect to a part of the configurations of each embodiment.

100 ... sewage, 101 ... aerobic tank inflow water, 102 ... simple treated water, 103 ... returned sludge, 104 ... treated water, 105 ... surplus sludge, 1 ... first settling basin, 2 ... aerobic tank, 3 ... final settling basin , 4 ... Air diffuser, 5 ... Blower, 6 ... Return pump, 7 ... Excess sludge pump, 8 ... Flow meter, 9 ... 1st ammonia meter, 10 ... DO meter, 11 ... Second ammonia meter, 12 ... Return flow rate Total, 13 ... Air volume meter, 14 ... Operation abnormality detection unit, 15 ... Operation abnormality period estimation unit, 16 ... Operation information storage unit, 17 ... Operation information display unit, 18 ... MLSS densitometer, 19 ... SS densitometer.

Claims (7)

The inflow water amount estimation unit that estimates the flow rate of the inflow water that flows into the treatment process for treating the water to be treated, the operation index estimation unit that estimates the operation index related to the treatment process, and the water quality of the outflow water that flows out from the treatment process. Using the estimated value in the treated water quality estimation unit to be estimated,
It has an operation information display unit that displays the estimated value of the treated water quality estimation unit in association with the estimated value of the operation index estimation unit for a predetermined period calculated based on the estimated value of the inflow water amount estimation unit. A water treatment plant operation support device characterized by. Having an operation information storage unit that stores the estimated value in the treated water quality estimation unit and the operation index estimation unit in a predetermined period calculated based on the estimated value in the inflow water amount estimation unit in association with each other. The operation support device for a water treatment plant according to claim 1, which is characterized. The operation index estimated by the operation index estimation unit is at least one of the water quality of the inflow water, the operation amount related to the treatment process, the calculated value by the model reproducing the treatment process, and the rainfall amount. The operation support device for the water treatment plant according to claim 1. The water treatment according to claim 1, further comprising an operation abnormality detection unit that compares the estimated value in the treated water quality estimation unit with a preset management reference value and detects an operation abnormality or a sign of the operation abnormality. Plant operation support device. Operation that estimates the abnormal operation arrival period based on the time when the operation abnormality detection unit detects an operation abnormality or a sign of an operation abnormality, the estimated value in the inflow water amount estimation unit, and the estimated value in the operation index estimation unit. The operation support device for a water treatment plant according to claim 4, further comprising an abnormal period estimation unit. The operation information display unit is characterized in that at least one of the estimated value in the inflow water amount estimation unit and the estimated value in the operation index estimation unit is displayed with respect to the estimated value in the treated water quality estimation unit. The operation support device for the water treatment plant according to claim 1. The water treatment plant according to claim 1, wherein the operation information display unit selects and displays display items related to the operation index estimation unit according to the water quality items estimated by the treated water quality estimation unit. Driving support device.

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