KR101156592B1 - Apparatus for water treatment filtration facility operation and method thereof - Google Patents

Abstract

PURPOSE: An apparatus and a method for operating a filtering type water treating facility are provided to expand the replacing cycle of membranes and to prevent membrane contamination from being deepen. CONSTITUTION: An apparatus for operating a filtering type water treating facility includes a water treating line(10), a filtering pump part(150), a treated water tank part(17), a washing unit, and a controlling part(100). The filtering pump part includes a pump(151) installed at a water treating line, a power meter(153), and a pump driver(152). The power meter measures the power changing of a pump. The controlling part is in connection with the washing unit and the filtering pump part in order to receive pump power values from the power meter and to determine the washing point of a membrane filtering part(16).

Description

Apparatus and method for operating a filtration type water treatment plant {APPARATUS FOR WATER TREATMENT FILTRATION FACILITY OPERATION AND METHOD THEREOF}

The present invention relates to an apparatus and a method for operating a water treatment plant using a filtration method, and more particularly, to an apparatus for operating a filtration method for controlling a filtration method using a power change of a filtration pump unit including an inverter. It is about a method.

In general, in the low pressure membrane filtration process, the chemical cleaning time is generally determined by the differential pressure, which is the pressure difference between the inlet and the outlet of the membrane, which is calculated based on the maximum pressure that the membrane can withstand.

In addition, in the high pressure membrane filtration process, the chemical cleaning time is usually determined by the rate of increase in pressure at the outlet of the pressurized pump or the rate of decrease in production volume, which is an operation technique focused on production quantity management.

However, in the operation of the membrane filtration process, especially in the case of reverse osmosis membrane filtration process using a high pressure operation, energy saving is one of the most important factors in terms of maintenance costs, it may be necessary to control and operating technology reflecting this.

The method for determining the filtration membrane cleaning cycle according to the prior art has been used by uniformly determining the chemical cleaning cycle using the membrane resistance value with time as shown in FIG.

However, in the prior art, since the chemical cleaning cycle was uniformly determined without considering the water quality characteristics of the fluid to be treated, the chemical cleaning was performed without knowing the degree of contamination of the filtration membrane. There is a disadvantage.

In addition, in the prior art, there has been an attempt to find a cleaning cycle using the interlayer differential pressure. Here, the intermembrane pressure difference may be defined as a difference value between the membrane inlet pressure and the membrane outlet or outlet pressure.

Particularly, in the related art, the determination of the membrane filtration cleaning cycle is to be made by increasing the membrane resistance value or the intermembrane differential pressure or decreasing the flow rate.

That is, in the related art, the change in the differential pressure, such as the interlayer differential pressure, is less sensitive than the change in the power of the pump. Therefore, when the amount of change in the differential pressure that determines a given washing cycle is large, a loss of power may occur and a waste of energy may increase. have.

According to an embodiment of the present invention, a power measurement device is used in real time after the operation of a facility by using a highly sensitive power change for cleaning time (eg, chemical cleaning time) while considering economics in a membrane filtration water treatment facility for water treatment. The present invention provides an apparatus and method for operating a filtration-type water treatment facility capable of performing the cleaning (chemical cleaning) of a membrane filter by measuring the power change of the filtration pump.

According to an aspect of the present invention, a water treatment line supplied with raw water treatment, a filtration pump unit installed in the water treatment line and supplying the water treatment raw water to the membrane filtration unit, and a treatment connected to the rear end of the membrane filtration unit in the water treatment line A water purifying unit installed between the water tank unit, the treated water tank unit and the membrane filtration unit to clean the membrane filtration unit, and calculating an operating loss index based on the power change of the pump provided in the filtration pump unit, and the membrane filtration An apparatus for operating a filtration type water treatment plant may include a controller connected to the rinsing apparatus and the filtration pump to determine and control the rinsing time of the unit as the operating loss index.

In addition, according to another aspect of the present invention, the flow rate meter installed in the water treatment line detects the treated water flow signal value and inputs to the control unit, the control unit controls the pump of the filtration pump unit with an inverter to adjust the treated water flow rate to the target value And inputting the pump power value to the cleaning time calculation algorithm of the control unit when the target value is reached, calculating the operating loss index based on the pump power value by the control unit, and operating loss index calculated by the control unit. A method of operating a filtration-type water treatment plant may include determining a membrane filtration unit cleaning time, and washing the membrane filtration unit at a cleaning time determined by the controller.

The embodiment of the present invention does not uniformly determine chemical cleaning, but it is possible to reasonably determine the cleaning time of the membrane filter through the operating loss index calculated by using the power change of the filtration pump more sensitive than the conventional membrane resistance value. There is an advantage.

That is, since the embodiment of the present invention performs the determination of the membrane filtration cleaning point or cycle through a reasonable economic analysis using the power rise, it is possible to determine and perform the optimal economic operation easily and quickly by the operator or the controller. .

In addition, since the embodiment of the present invention determines the cleaning cycle or period of the membrane filter unit sensitively and economically through the power change of the filtration pump unit, it is possible to prevent the contamination of the membrane of the membrane filter unit in advance, thereby replacing the membrane. The frequency of the membrane can be increased, and the chemical contamination of the membrane at an appropriate level in terms of operating economy or device safety can also increase the useful life of the membrane economically.

In addition, an embodiment of the present invention provides a control unit that can automatically control the rotational speed of the pump of the filtration pump unit according to the production quantity for the operation of the constant flow filtration method, such as an inverter, and measures the amount of loss due to the power rise In order to measure the power of the filtration pump unit is installed a power meter, there is an advantage that can be processed in real time the pump power value of the pump of the filtration pump unit measured by the power meter in the control unit.

In addition, in the embodiment of the present invention, the pump power value of the pump of the filtration pump unit subjected to input processing in real time is input to the controller, and the controller considers the total operating loss amount by using the input pump power value in the washing time calculation algorithm of the controller. By calculating and determining whether to clean at this point, and instead of stopping the filtration pump, the chemical cleaning pump unit and the chemical injection device are operated. Thus, the cleaning step is systematically performed by the chemical cleaning pump unit and the chemical injection device. It is possible to improve the fluid treatment efficiency.

1 is a graph showing how the membrane resistance value of the filtration membrane according to the prior art is changed.
2 is a block diagram of an operating apparatus of a water treatment facility of the filtration method according to an embodiment of the present invention.
3 is a flowchart of a method of operating a filtration type water treatment plant shown in FIG. 2.
4 is a graph illustrating pump power and power loss solution of the filtration pump unit shown in FIG. 2.
5 is a graph showing the washing loss, power loss and total operating loss in the filtration-type water treatment facility.
Figure 6 is a graph showing the actual power change curve in the pump for the filtration pump portion of the filtration water treatment facility.
7 is a graph showing the estimated total operating loss curve and the actual total operating loss curve in the filtration-type water treatment plant.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The basic cleaning correction method of the present embodiment may be implemented through the following background knowledge and developed formulas.

In this embodiment, the filtration type water treatment facility may be described based on the facility of the reverse osmosis membrane filtration process, for example.

The loss costs incurred when cleaning is required at any point, i.e. at any point, after the operation or operation of the filtration-type water treatment plant, is the amount of power loss that is the cumulative energy loss corresponding to the increase in power due to the membrane contamination up to that point. And, it can be divided into cleaning loss liquid generated as a loss as the production is stopped for cleaning.

Here, the power loss amount increases with time, while the cleaning loss amount is lower as the cleaning cycle is longer, and thus may show opposite trends.

Therefore, the sum of the power loss amount and the washing loss amount may be represented by a graph having an inflection point Q as the total operating loss amount (see FIG. 5).

The total operating loss is largely affected by the cleaning loss at the beginning of the operation, but as the effect of the power loss increases over time, an inflection point (Q) can occur, and the inflection point is the most economical chemical cleaning point. Can be determined.

However, these calculations can be estimated only after the facility is actually operated until the maximum pump power is reached, so that each facility has various influence factors such as water quality, membrane condition or membrane contamination condition. For example, it is very difficult to predict the time of cleaning only by the experience of operating the equipment in a pilot state, and the predicted results of the time of cleaning may vary depending on the influence factors.

Hereinafter, inferring a point in time at which the operating cost can be reduced while increasing the service life of the membrane, and thus the operation apparatus and method of the filtration type water treatment plant according to the present embodiment for contributing to the reduction of the operating cost will be described in detail. I will explain.

2 is a block diagram of an operating apparatus of a water treatment facility of the filtration method according to an embodiment of the present invention.

Referring to FIG. 2, the filtration type water treatment facility may be composed of a reverse osmosis membrane filtration process facility.

Reverse osmosis membrane filtration process equipment is not shown or described in detail in the drawings or description, but may basically include a water treatment line 10 is supplied with the raw water treatment, and a water treatment apparatus installed in the water treatment line (10).

The water treatment device may be configured in the form of reverse osmosis membrane filtration process equipment, in this case raw water tank unit 11, supply pump unit 12, chemical input unit 13, strainer 14, filtration pump unit 150 It may include one or more of the membrane filtration unit 16 and the treated water tank unit 17.

Condensate or concentrated water from the membrane filtration unit 16 may be discharged or fed to the reprocessing or recycling facility 19 for treatment.

Membrane filtration unit 16 may have a configuration such as ultrafiltration, reverse osmosis, and the like, its capacity or number of installation may be appropriately configured according to the size of the installation, and may be used as a sterilization facility (not shown).

The treated water tank unit 17 may be connected to the rear end of the membrane filter unit 16 in the water treatment line 10.

Production water from the treated water tank unit 17 is to be supplied to the supply source (18).

In particular, for the present embodiment, the reverse osmosis membrane filtration process of the automatic pumping of the rotation speed of the pump 151 of the filtration pump unit 150 to the inverter 101 according to the production amount for the operation of the constant flow filtration method Or a system 100 for controlling in a systematic manner.

The control unit 100 is composed of a computer device or a system, and the control unit 100 includes a device controller 102 including a signal input / output unit, a cleaning time calculation algorithm, or a memory unit for recording and storing a device control algorithm for each device, and the pump. The rotation speed control inverter 101 of 151 may be provided. The inverter 101 may play a role of controlling the rotation speed of the pump 151 of the filtration pump unit 150 according to the production quantity for the operation of the constant flow filtration method.

In addition, the reverse osmosis membrane filtration process facility may further include a flow meter 110 for detecting the flow rate of the production water or the treated water flowed out of the membrane filtration unit 16 and the electronic circuit to the control unit 100.

The flow meter 110 may be configured as a digital flow meter, and may be installed in the water treatment line 10 between the membrane filtration unit 16 and the treatment water tank unit 17.

In addition, the reverse osmosis membrane filtration process facility may further include a filtration pump unit 150 provided between the strainer 14 and the membrane filtration unit 16.

The filtration pump unit 150 includes a pump 151 installed in the water treatment line 10 between the strainer 14 and the membrane filtration unit 16, and a pump driver for operating the pump 151 using a control signal of the controller 100. 152 may include.

In addition, the filtration pump unit 150 is connected to the pump 151 to measure the power change of the pump 151, and to input the pump power value corresponding to the power change of the pump 151 to the controller 100. It may include a power meter 153 installed in the filtration pump unit 150.

More specifically, the power meter 153 may be connected to the pump driver 152 and used to measure the power change of the pump 151 provided in the filtration pump unit 150. At this time, the power meter 153 may be composed of a Hall sensor and a power measurement circuit for measuring the pump power value of the pump 151 by measuring the power change of the pump 151 through the pump driver 152.

Here, the pump power value is measured or detected through the Hall sensor and the power measurement circuit, and is calculated using the current or voltage value measured by the operating power of the pump 151 input to the controller 100 (eg, measured during pump operation). A power value).

In addition, the reverse osmosis membrane filtration process equipment may include a cleaning device connected between the membrane filtration unit 16 and the treated water tank unit 17 in a known manner.

Here, the washing apparatus may include a chemical cleaning pump unit 20 connected to the treated water tank unit 17. In addition, the cleaning apparatus includes a chemical injection device 21 coupled to the chemical cleaning pump unit 20 and connected to the membrane filtration unit 16 to clean the membrane filtration unit 16 according to the cleaning signal of the controller 100. can do.

The control unit 100 is configured to transmit the cleaning signal according to the cleaning time determination to the filtration pump unit 150, the chemical cleaning pump unit 20 and the chemical injection device 21, accordingly in advance to the control unit 100 Instead of temporarily stopping the filtration pump unit 150 so that a predetermined series of chemical cleaning processes may be performed, the operation of the chemical cleaning pump unit 20 and the chemical injection device 21 may be controlled.

Hereinafter, an operation method of the filtration type water treatment facility will be described.

3 is a flowchart of a method of operating a filtration type water treatment plant shown in FIG. 2.

Referring to FIG. 3, in the method of operating a filtration system according to an exemplary embodiment, a step of inputting a treatment water flow signal value to a control unit (S100), and a pump of a filtration pump unit to adjust the treatment water flow rate to a target value is an inverter. (S120), inputting the pump power value to the cleaning time calculation algorithm of the control unit when the target value is reached (S120), calculating the operating loss index using the pump power value (S130), and calculating Determining the time of cleaning the membrane filter unit by the operating loss index (S140), and the step of cleaning the membrane filter unit at the determined cleaning time (S150).

Such steps S100 to S150 may be performed by the controller mentioned in the device description.

Basically, the control unit may perform the operation of the constant flow filtration method when the filtration system is operated. That is, the control unit is configured to automatically control the operation of the pump through the pump driver as a control signal of the control unit as the rotational speed of the pump of the filtration pump unit in accordance with the production quantity.

For example, in step S100 of inputting the treated water flow rate signal value to the controller during the automatic control, the flowmeter installed in the water treatment line may measure the treated water flow rate.

The flowmeter can input the detected water flow rate signal value corresponding to the measured water flow rate to the controller.

The control unit performs a step (S110) of controlling the pump of the filtration pump unit with an inverter to adjust the treated water flow rate to the target value. That is, the controller controls the rotation speed of the pump of the filtration pump unit according to the production quantity to perform the operation of the constant flow filtration method through the inverter.

Thereafter, when the target value is reached, the input of the pump power value to the cleaning time calculation algorithm of the controller may be performed (S120).

The clean-up calculation algorithm is for deriving the operating loss index, which is an economic index at any point in time. For example, an arbitrary unit time is inferred through the rate of increase in power costs. It can be programmed to calculate, and this can be described in detail through the step (S130) of calculating the operating loss index using the pump power value below.

For the demonstration of this embodiment, the change of pump power according to the operation time during the constant flow filtration operation in the actual sewage reuse pilot process (e.g. production quantity 240m 3 / day) using reverse osmosis membrane (RO) The behavior was identified as shown in FIG.

4 is a graph illustrating pump power and power loss solution of the filtration pump unit shown in FIG. 2.

Referring to FIG. 4, since the membrane contamination of the membrane filter part is not large at the beginning of operation, the power change of the pump of the filtration pump part is insignificant. It is estimated that the amount of power loss is proportionally higher.

In addition, it can be inferred that the pump power change or the pump power change can be changed more sensitively than the differential pressure (proportional to the amount of change in the total head), which is a general membrane fouling index.

It can be seen from the analogous law of the pump that the total head of the pump is proportional to the square of the rotational speed of the pump, and the pump power is proportional to the third square of the rotational speed.

In fact, the pump of the filtration pump part has been operated until the time when the maximum operating power (Lmax) is reached or the operation period (Dmax).

As a result, the actual total operating loss obtained by operating the pump up to the maximum operating power (Lmax) was calculated through Equation 1 below and the graph shown in FIG.

Here, the actual total operating loss amount may be defined as the sum of the washing loss amount and the power loss amount, the tn time point at any point, and the Dmax may be defined as an operation period or time when the maximum operating power (Lmax) is reached.

In addition, the washing loss liquid may be defined as the washing liquid loss at one time tn times the washing count up to the Dmax period when washing. That is, the washing loss liquid is a loss liquid generated during washing, and can also be calculated as a product of washing time, production quantity, and production means price.

In addition, the power loss amount may be defined as a cumulative loss amount due to an increase in power that is increased due to filtration resistance of the membrane at an arbitrary time point tn.

As can be seen in Figure 5, the inflection point (Q) of the exemplary actual total operating loss amount appeared about 55 days, it was found that performing the chemical taxation is the most preferable in terms of operating costs.

However, in order to analyze the economic feasibility as described above in order to find the most economical chemical cleaning point, the unit time (Dmax in the above case) must be determined. It is necessary to know whether this will be done, so that the loss can be estimated.

In view of such a realistic point, the present embodiment may provide a step (S130) of calculating an operating loss index using a pump power value corresponding to a highly sensitive pump power change, which can be described with reference to FIG. 6. have.

Figure 6 is a graph showing the actual power change curve in the pump for the filtration pump portion of the filtration water treatment facility.

Referring to FIG. 6, the calculating of the operating loss index using the pump power value (S130) may include calculating the energy loss amount and the power ratio increase rate of the pump at any point in time.

The energy loss of the pump at any point in time can be defined by Equation 2.

Here, tn may be defined as an arbitrary point as shown in Figure 6, Ln is the power used at any point, Δt is a time increment value, En is the amount of energy loss of the pump, L ₀ may be defined as the initial power value after chemical cleaning. .

The rate of increase in power ratio may be obtained as shown in Equation 3.

Here, Θ n may be defined as a power ratio increase rate obtained by dividing a used power increment value by a time increment value, Ln used power at an arbitrary point in time, and Ln-1 may be defined as used power calculated in a step immediately before an arbitrary point in time.

In addition, the step of calculating the operating loss index by using the pump power value (S130) may further include the step of calculating a predetermined unit time and the estimated number of times of cleaning using the power ratio increase rate calculated in the above process.

Any unit time may be defined by Equation 4.

Here, Tn means an arbitrary unit time as shown in FIG. 6, and an estimated time for reaching the maximum operating power (Lmax) of the pump at any point in time, Ln is the power used at any point in time, and Θn is the rate of increase in power ratio. It can be defined as.

The estimated cleaning frequency can be defined by Equation 5.

Here, Tn may be defined as a numerical value added by assuming that an arbitrary unit time, tn is an arbitrary time, and 1 is an arbitrary point reference cleaning is performed once.

Finally, calculating the operating loss index by using the pump power value (S130) may further include calculating the estimated total operating loss amount and the operating loss index by using the estimated cleaning frequency calculated in the above process.

The estimated total operating loss can be calculated as shown in [Equation 6] using the energy loss amount and the estimated number of times of cleaning.

Here, Cn may be defined as the estimated total operating loss amount at any point, En is the energy loss amount of the pump, the loss ratio due to the cleaning is the cleaning loss amount (cleaning time ㅧ production quantity ㅧ production means), Wn is the estimated cleaning frequency.

The operating loss index can be calculated through Equation 7 corresponding to the cleaning point determination formula.

은 임의 시점에서의 추정 총운영손실액이고,

은 임의 시점 직전단계에서 산출한 추정 총운영손실액이고,

-

의 연산값은 운영손실지수일 수 있다.here,

Is the estimated total operating loss at any point in time,

Is the estimated total operating loss calculated at the stage just before any point in time,

-

The computed value of may be an operating loss index.

The control unit may perform the step (S140) of determining the membrane filter cleaning time using the calculated operating loss index.

That is, the operating loss index may be understood as an estimated inflection point P of the estimated total operating loss when judged from the perspective of the graph shown in FIG. 7.

7 is a graph showing the estimated total operating loss curve and the actual total operating loss curve in the filtration-type water treatment plant.

Referring to FIG. 7, the estimated total operating loss amount, which is a component of the operating loss index, may be distorted at an initial stage. This is because the rate of increase of the power ratio is small, so that the unit time is larger than the actual time.

However, as the power cost increase rate increases, the actual total operating loss amount and the estimated total operating loss amount become almost similar. As a result, in this embodiment, the most economic cleaning point is determined by the operating loss index calculated through inference.

-

의 연산값에 해당하는 운영손실지수가 0과 같거나 큰 값을 갖게 경우의 시점을 추정 변곡점(P)으로 판단하여 세정시점으로 결정하게 된다.That is, the controller

-

When the operating loss index corresponding to the operation value of has a value equal to or greater than 0, the time point is determined as the estimated inflection point P and is determined as the cleaning time point.

As shown in FIG. 5 or FIG. 7, the most economical cleaning time point corresponding to the estimated inflection point P may be similar to the inflection point Q due to the actual total operating loss.

Thereafter, the controller may perform a step of washing the membrane filter unit at the determined cleaning time (S150).

That is, the control unit operates the chemical cleaning pump unit and the chemical injection device, which are cleaning devices, instead of stopping the pump of the filtration pump unit according to the determined cleaning time, so that the cleaning by the chemical cleaning pump unit and the chemical injection device is performed in the membrane filter unit. It can be done.

As a result, the present embodiment was evaluated to reduce the operating cost about 4 won / ㎥, which is equivalent to 1% of the production cost, it was possible to achieve economical equipment operation.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiment of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

11: raw water tank part 12: supply pump part
13: chemical injection unit 14: strainer
16: membrane filter 17: treated water tank
20: chemical cleaning pump unit 21: chemical injection device
100 control unit 110 flow meter
150: filtration pump section 151: pump
152: pump 153: power meter

Claims (13)

A water treatment line to which raw water is supplied;
It is installed in the water treatment line to supply the water treatment raw water to the membrane filtration unit, a pump installed in the water treatment line, a power meter connected to the pump to measure the power change of the pump, to operate the pump as a control signal of the controller A filtration pump unit including a pump driver connected to the pump to
A treatment water tank part connected to the rear end of the membrane filtration part in the water treatment line;
A cleaning device installed between the treated water tank part and the membrane filter part to clean the membrane filter part;
The pump power value corresponding to the power change of the pump is input from the power meter, the operating loss index is calculated by changing the power of the pump provided in the filtration pump unit, and the cleaning time of the membrane filter unit is determined as the operating loss index. And a control unit connected to the washing apparatus and the filtration pump unit to control the same.
Operation apparatus of filtration type water treatment plant.
delete The method of claim 1,
The filtration pump unit,
Further comprising an inverter for controlling the rotational speed of the pump according to the production quantity for the operation of the constant flow filtration method
Operation apparatus of filtration type water treatment plant.
The method of claim 1,
The power meter,
Characterized in that it comprises a Hall sensor and a power measurement circuit for measuring the pump power value of the pump by measuring the power change of the pump through the pump driver
Operation apparatus of filtration type water treatment plant.
The method of claim 1,
A flow meter installed in the water treatment line and connected to the control unit electronically and detecting a flow rate of the treated water corresponding to the flow rate of the produced water exiting the membrane filter unit;
Operation apparatus of filtration type water treatment plant.
(a) a flow meter installed in the water treatment line detecting the treated water flow signal value and inputting it to the control unit;
(b) the control unit controlling the pump of the filtration pump unit to adjust the treated water flow rate to the target value;
(c) inputting the pump power value to the cleaning time calculation algorithm of the controller when the target value is reached;
(d) calculating, by the controller, an operating loss index based on the pump power value;
(e) determining the membrane filter cleaning time using the operating loss index calculated by the controller;
(f) cleaning the membrane filter at the cleaning time determined by the control unit.
Operation method of filtration type water treatment facility.
The method according to claim 6,
The step (d)
Comprising the step of calculating the energy loss amount and power ratio increase rate of the pump at any point in time to calculate the operating loss index based on the pump power value
Operation method of filtration type water treatment facility.
The method of claim 7, wherein
The step (d)
Comprising a step of calculating a predetermined unit time and the estimated number of times of cleaning by using the power ratio increase rate
Operation method of filtration type water treatment facility.
The method of claim 8,
The step (d)
Calculating an estimated total operating loss amount and an operating loss index using the estimated cleaning frequency;
Operation method of filtration type water treatment facility.
The method of claim 9,
The estimated total operating loss is

Characterized in that the equation
Operation method of filtration type water treatment facility.
Where Cn is the estimated total operating loss at any point, En is the energy loss of the pump, the loss ratio due to cleaning is the cleaning loss (cleaning time × number of production × production means), and Wn is the estimated cleaning frequency.
The method of claim 9,
The operating loss index is

Characterized in that it is determined by the cleaning time determination formula such as
Operation method of filtration type water treatment facility.
here,

Is the estimated total operating loss at any point in time,

Is the estimated total operating loss calculated at the stage just before any point in time,

-

The operating value of is the operating loss index.
The method according to claim 6,
In the step (e),
The controller determines a time point when the operation loss index is equal to or greater than 0 as a cleaning time point.
Operation method of filtration type water treatment facility.
The method according to claim 6,
The step (f)
Instead of stopping the pump of the filtration pump unit according to the cleaning time determined by the control unit, the chemical cleaning pump unit and the chemical injection device, which are cleaning devices, are operated so that the cleaning by the chemical cleaning pump unit and the chemical injection device is performed. Characterized in that
Operation method of filtration type water treatment facility.

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