KR100979096B1 - Optimized operation control system and method for membrane process using intermittent aeration - Google Patents

Abstract

The present invention calculates the membrane fouling index by measuring the transmembrane pressure, filtered water temperature, membrane flux (Flux), etc., in order to cope with the rapidly changing characteristics of the raw water quality of the season, the membrane turbidity (Feed Turbidity) and membrane Membrane separation process using intermittent aeration type air cleaning method which controls Aeration Methods and Air Scouring Intensity using pollution index and automatically controls in real time by high efficiency low energy intermittent aeration type air cleaning method It relates to an optimal operation control system and method.

The present invention described above quantified the amount of air cleaning according to the degree of membrane fouling, quantified the energy required for cleaning by differentiating the air cleaning method according to the raw water turbidity change, not only can be linked to the automatic control system, but also stable membrane Maintains filtration characteristics and has the effect of optimizing membrane separation process operation.

Membrane filtration tank, Submerged membrane filtration unit, Online turbidity meter, Membrane influent turbidity, Intermembrane pressure, Membrane contamination index, Membrane separation, Intermittent aeration

Description

Optimalized operation control system and method for membrane process using intermittent aeration}

The present invention relates to a system and method for optimal operation control of a membrane separation process using an intermittent aeration type air cleaning method for efficiently and economically performing an immersion membrane separation process in the field of advanced water treatment technology. In order to cope with the rapidly changing characteristics of raw water quality, the membrane fouling index (Fouling Index) is calculated by measuring the transmembrane pressure, the filtered water temperature, the membrane flux, and the membrane turbidity and the feed turbidity. Optimal operation control system for membrane separation process that can control Aeration Methods and Air Scouring Intensity using pollution index and can automatically control in real time by high efficiency low energy intermittent aeration type air cleaning method And to a method.

In general, the membrane separation process controls the operation by monitoring the change of the interlayer differential pressure after maintaining a constant filtration flow rate and performing backwashing when the predetermined pressure is exceeded or exceeds a predetermined time. These methods can be classified into two types: Continuous Aeration Filtration Methods, which perform air cleaning simultaneously with filtration, and Non Aeration Filtraton Methods, which do not clean air at all during the filtration period. There is this. Both methods are widely used in many water purification systems and have advantages and disadvantages. First, the continuous aeration filtration method can cope with a wider range of influent turbidity material that causes reversible fouling, but the energy loss due to continuous aeration is large. On the other hand, the aeration-free filtration method has a small energy loss, but a relatively small coping range for the influent turbid material. Both of these methods have the advantage of simplicity of operation, but it is difficult to maximize both economic efficiency and efficiency when the water quality changes severely. For example, the aeration-free filtration method requires additional pretreatment facilities such as settling or roughing filters when introduced under conditions of large water quality changes, and the continuous aeration filtration method requires large maintenance costs. It has a downside.

Therefore, the present invention has been proposed to solve the above-mentioned problems, and the characteristics of the domestic surface water with a significant change in raw water quality using Periodic Aeration Filtration Methods using membrane influent turbidity and membrane contamination index. The purpose of the present invention is to provide an optimal operation control system and method for the membrane separation process using the intermittent aeration type air cleaning method that can control the high efficiency low energy membrane separation process by applying the most suitable aeration method and aeration intensity control to the automatic control system. have.

In addition, the present invention quantifies the amount of air cleaning according to the degree of membrane fouling, and quantifies the energy required for cleaning by differentiating the air cleaning method according to the raw water turbidity change, can be linked to the automatic control system, as well as stable membrane filtration It is another object of the present invention to provide an optimal operation control system and method for a membrane separation process using an intermittent aeration type air cleaning method capable of maintaining the characteristics and optimizing the membrane separation process operation.

In addition, the present invention collects, displays and database real-time data on membrane fouling index, turbidity and operating conditions, and enables early warning of membrane fouling, aeration method and aeration volume control according to membrane fouling degree, and energy. It is another object of the present invention to provide an optimal operation control system and method for a membrane separation process using an intermittent aeration air cleaning method that can optimize consumption efficiency.

In order to achieve the above object, the present invention is composed of a plurality of membrane immersion membrane module unit for filtering and settling the incoming water, and installed in the bottom for backwashing to generate air bubbles to minimize adsorption by the turbidity of the membrane surface A membrane filtration tank having an air diffuser for performing filtration and back washing of the separation membrane; An on-line turbidimeter installed at the front end of the membrane filtration tank and measuring the turbidity of pretreated raw water flowing into the membrane; A treatment tank for storing the membrane filtration water passing through the membrane filtration tank and used as backwash water of the separation membrane; A backwashing water tank installed on a drain line of the membrane filtration tank for temporarily storing a backwashing liquid submerged downward after backwashing; A centrifugal pump installed on a piping line of the treatment tank, the centrifugal pump being operated to deliver the treatment water necessary for backwashing the membrane module unit to the treatment tank; A backwash wastewater flow meter for measuring the flow rate of backwash water generated after backwashing for monitoring and control of a constant recovery rate in a continuous aeration; A membrane filtration treated water flow meter installed on a connection pipe between the centrifugal pump and the treated water tank and configured to measure the filtration flux contained in the treated water passing through the centrifugal pump; It is installed on one side of the membrane filtration water flow meter to measure the pH in order to improve the stability of the treated water in accordance with the drinking water quality standards, water temperature and pH meter with a built-in water thermometer to calculate the viscosity of the fluid by measuring the water temperature ; A pressure gauge installed on the discharge line of the membrane module unit and measuring a transmembrane pressure; It is installed on the membrane inlet pipe line of the membrane filtration tank, the filtration pipe line of the treatment tank, and the drain line of the backwash tank for the application of the intermittent aeration backwash method in the filtration and backwash of the separation membrane. An automatic valve turned on / off by; Apply the turbidity signal of the membrane influent water measured by the on-line turbidimeter, the water temperature signal measured by the water temperature and pH meter, the filtration flux measured by the membrane filtration treated water flow meter and the signal for the intermembrane differential pressure measured by the pressure gauge A logic calculation unit which calculates and displays the turbidity increase rate, the filtration flux, and the membrane contamination index; And a control unit configured to send a control signal to the general apparatus by setting an automatic control logic (Logic) for the back washing cycle and the back washing method using the turbidity increase rate and the membrane contamination index calculated by the logic operation unit. It provides an optimal operation control system of membrane separation process using cleaning method.

In addition, the present invention comprises a first step of measuring the turbidity of the membrane influent water flowing into the membrane filtration tank from the outside through an online turbidimeter; Water temperature measurement by a water temperature meter built in a water temperature and pH measurement system, a filtration flux flow rate measurement through a membrane filtration water flow meter, and a transmembrane pressure (TMP) through a pressure gauge step; A third step of calculating a membrane fouling index (MFI) based on the water temperature measured in the second step, the filtration plus flow rate, and the intermembrane pressure difference (TMP); A fourth step of determining the aeration intensity with the membrane contamination index calculated in the third step and performing aeration / intermittent aeration filtration; A fifth step of comparing and determining the magnitude of the membrane contamination index and the magnitude of the first set value, and maintaining the current operating condition if the membrane contamination index is smaller than the first set value and storing the data in a DB; When the membrane fouling index exceeds the first set value in the fifth step, the turbidity of the inflow source water is greater than the second set value by comparing / determining the magnitude of the turbidity of the inflow source and the second set value of the inflow turbidity. A sixth step of converting from the aeration / intermittent air cleaning method to the continuous aeration air cleaning method if large; A seventh step of performing a fourth step if it is determined that the turbidity of the inflowed water is smaller than the second set value after the sixth step; And when the turbidity of the inflowing water is determined to be smaller than the second set value, the membrane separation using the intermittent aeration type air cleaning method including an eighth step of increasing the injection amount of the flocculant according to the increase of the membrane fouling index and storing the data in the DB. It provides an optimal operation control method of the process.

According to the present invention having the above characteristics, the database can be analyzed by real-time analysis of the on-line measurement items, such as turbidity of influent water flowing into the membrane separation system for water treatment, and the membrane contamination index calculated from the rate of increase of the interlayer differential pressure of the membrane module in real time. The operator can control the process by calculating the operation factors of each unit process through the quantified operation data, which has the effect of safe and reliable water treatment.

In addition, there is another effect of automating the operation of the membrane separation process by linking the collected data with the automatic control system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention that can specifically realize the above objects will be described with reference to FIG. 1 so that those skilled in the art may easily implement the present invention.

Preferred embodiments of the invention will be described in detail by way of example only. However, the apparatus and method of the present invention can be similarly applied to other embodiments without departing from the spirit of the present invention.

1 is a process diagram schematically showing an optimal control system of an intermittent aeration type air cleaning method by continuous monitoring of membrane influent turbidity and membrane fouling index in the advanced water treatment process using the membrane separation of the present invention. This is as follows.

The present invention, as shown in the drawings, in the high-purity water treatment system, the flow rate adjustment tank (1) for adjusting the flow rate of the membrane filtration tank to be described later; Submerged membrane module unit (6) installed in the upper part and consisting of a plurality of membranes to filter and settle the raw water, and a backwashing diffuser installed in the lower floor to generate air bubbles to minimize adsorption by the turbidity of the membrane surface ( A membrane filtration tank (2) for performing filtration and back washing of the separation membrane, including 7); A treatment tank (3) for storing the membrane filtration water passing through the membrane filtration tank (2) and used as backwash water for the separation membrane; A backwashing water tank (4) positioned at the bottom of the membrane filtration tank (2) for temporarily storing a backwashing liquid immersed downward after backwashing; A degassing tank (5) installed on the treated water pipe line of the treated water tank (3) to remove air generated in the conduit during filtration of raw water using the separator; A blower (8) for injecting air into the diffuser (7); A centrifugal pump (9) installed on the piping line of the treatment tank (3), the centrifugal pump (9) being operated to deliver the treatment water necessary for backwashing the membrane module unit (6) to the treatment tank (3); An on-line turbidimeter (10) installed on a pipe line connecting the flow control tank (1) and the membrane filtration tank (2) to measure the turbidity of the pretreated inlet source sample flowing into the membrane filtration tank (2); It is installed in the bypass line of the line connecting the membrane filtration tank (2) and the backwash waste water tank (4), the backwash to measure the flow rate of the backwash waste water generated after backwashing for the monitoring and control of the constant recovery rate in a continuous aeration type Wastewater drifting system 11; A membrane filtration treated water flow meter (12) installed on a connection pipe of the centrifugal pump (9) and the treated water tank (3) for measuring the filtration flux contained in the treated water passing through the centrifugal pump (9); Installed on one side of the membrane filtration water flow meter (12) to measure the pH in order to improve the stability of the treated water in accordance with the drinking water quality standards, water temperature with a built-in water thermometer for measuring the water temperature to calculate the viscosity (Viscosity) of the fluid And a pH meter 13; A pressure gauge (14) installed on the discharge line of the membrane module unit (6) for measuring a transmembrane pressure; A water level measuring pressure gauge 15 for adjusting the water level of the membrane filtration tank 2; A defoaming tank level sensor (16) for controlling the level of the degassing tank (5); A valve (17) installed on the discharge line of the flow control tank (1), the valve (17) being opened and closed to automatically adjust the water level of the membrane filter tank (2) in conjunction with the membrane filter pressure gauge (14); Membrane inlet pipe line of the membrane filtration tank (2), filtration pipe line of the treatment tank (3) and drain line of the backwash water tank (4) for application of the intermittent aeration air cleaning method for filtration and backwash of the separation membrane. Automatic valves 18 to 24 installed on and off, respectively; The turbidity signal of the membrane influent water measured by the on-line turbidimeter 10, the water temperature signal measured by the water temperature meter built in the water temperature and pH meter 13, the filtration flux measured through the membrane filtration treated water flow meter (12) and A logic calculation unit 25 which receives a signal for the intermembrane differential pressure measured by the pressure gauge 14 to calculate and display the filtration flux and the membrane contamination index; An automatic control logic (Logic) for the air cleaning method and the intensity is set by using the influent turbidity and membrane contamination index calculated by the logic operation unit 25, and includes a control unit 26 for sending a signal to each control unit. do.
In the above configuration, in the case of the water temperature and pH meter 13 is presented as a built-in water thermometer, a structure in which the water thermometer is separated from the pH meter is also possible.
The reason for the pH measurement through the water temperature and pH measurement system 13 is that in the case of membrane filtration process, because the periodic acid or alkali cleaning, in order to use as drinking water, the pH must be adjusted to the drinking water quality standards, and the treated water through this pH measurement This is to promote the stability of the.

The membrane fouling index (FI), which is a key factor of the present invention, is a reversible membrane fouling index value, which is derived as follows, and the filtration resistance is increased due to the fact that particles present in the membrane influent form a cake on the filter surface. Assuming that the rate of decrease of the permeate flow rate dV with respect to time dt is expressed by Equation 1 below.

[Equation 1]

The membrane filtration resistance is expressed by Equation 2 below by Darcy's Law. Where R _m is the resistance of the membrane itself, R _c is the resistance generated by forming a cake on the surface of the membrane, ΔP is the interlayer differential pressure (TMP), A is the surface area, and μ is the viscosity coefficient (Viscosity). ).

[Equation 2]

In [Equation 1] and [Equation 2], the membrane permeability decrease with respect to the filtration time when the membrane influent concentration is C ₀ is expressed as the following [Equation 3].

&Quot; (3) "

In the above equation, a value representing membrane fouling due to water quality may be expressed as a modified fouling index (MFI). Here, α is a specific resistance value, and V is the total volume filtered during the reference time for calculating the membrane fouling index, that is, the volume measured from time t1 to t1 + n hours.

The MFI is shown in Equation 4 below.

&Quot; (4) "

Here, FI may be expressed as α × C0 as a measure of membrane fouling, and MFI may be defined as in Equation 5 below.

[Equation 5]

Q _i is the initial permeate flow value, that is, the flow rate filtered when the initial operation was performed after backwashing.

Re-expression [Equation 3] to the FI equation is the same as [Equation 6] below.

&Quot; (6) "

Where Q _f represents the final permeate flow, R _i represents the filtration resistance (initial filtration resistance) of the membrane itself, and R _f represents the filtration resistance of the membrane contaminant (pre-filtering resistance). Indicates.

Reversible membrane fouling index (FI) has the same meaning as the specific cake resistance of the contaminant layer formed on the surface of the membrane, so that it can show not only the speed of membrane fouling but also the characteristics of the material causing the membrane fouling. have.

The present invention configured as described above is capable of analyzing in real time the membrane contamination index calculated from the on-line measurement items such as turbidity of influent water flowing into the membrane separation system for water treatment, and the rate of increase of the interlayer differential pressure of the membrane module and collecting data. Database and display. Accordingly, the operator can control the process by calculating the operating factors of each unit process through the quantified operation data, thereby performing safe and reliable water treatment. In addition, the collected data can be linked to an automatic control system to automate the membrane separation process operation.

2 is a control flowchart of the intermittent aeration air cleaning method using the membrane fouling index and the online membrane inflow turbidity according to the present invention.

As shown in the figure, when raw water flows into the membrane filtration tank 2 from the outside, the turbidity of the membrane inflow water is measured through the on-line turbidimeter 10 (S2).

At this time, the membrane influent turbidity is measured in real time to cope with instantaneous water fluctuations. Then, the membrane influent turbidity data collected through the on-line turbidimeter 10 is used by the logic operation unit 25 for control using a 1-minute average value, and this value is higher than 30 second than the second set value to be described later. The air cleaning method is converted, but the membrane fouling index value is calculated once per backwash cycle and controlled so that the air cleaning system changes when the membrane fouling index value changes.

Next, the water temperature measurement by the water temperature meter built in the water temperature and pH measurement system 13 with respect to the treated water passing through the membrane filtration tank 2, the filtration flux flow rate measurement through the membrane filtration treated water flow meter 12, and The inter-membrane pressure difference (TMP) through the pressure gauge 14 is measured (S4).

The membrane fouling index (MFI) is calculated using the water temperature measured in the step S4, the filtration plus flow rate and the intermembrane differential pressure (TMP), and the membrane fouling index is calculated using the above Equation 6 (S6). ). The aeration intensity is determined by the membrane fouling index (MFI) calculated in step S6, and aeration / intermittent aeration type filtration is performed (S8 and S10).

Herein, the water temperature, the filtration plus flow rate and the intermembrane pressure difference (TMP) are measured in real time through the water filtration meter and the pressure gauge of the membrane filtration treated water flow meter, the water temperature and pH meter, and the membrane fouling index value is calculated using the 1 minute average value. The backwashing method by intermittent aeration filtration and air cleaning is determined by comparing the calculated membrane fouling index value and the membrane fouling index set value once in the backwash cycle. The intermittent aeration method and the backwashing method by air cleaning may be determined by displaying the membrane inflow turbidity data and the membrane contamination index data to the plant manager through prediction of the manager or in conjunction with an external process control unit.

After performing step S10, the magnitude of the membrane contamination index and the set value A are compared and judged. If the membrane contamination index is smaller than the set value A, the current operation condition is maintained and the data is stored in the DB (S12, S14, S16). ).

In the step S10, the membrane contamination index set value A sets its initial value to 10, and this value may vary depending on the type of membrane module unit rather than having a fixed value.

When the membrane fouling index exceeds the set value A in step S10, that is, after collecting data through the respective measuring equipment, the membrane influent turbidity set value (initial set value 30NTU) When turbidity of influent water is greater than the set value B by comparing / determining the magnitude of turbidity of influent water, turbid material is considered to be the most influential factor on membrane fouling and is a continuous aeration type air cleaning method in the aeration / intermittent air cleaning method. (S18, S20).

If the continuous aeration type filtration is continuously performed, and it is determined that the turbidity of the inflow source water is smaller than the set value B, the flow returns to step S10 to perform the aeration / intermittent aeration type filtration (S22).

If it is determined that the turbidity of the inflow source water is smaller than the set value B, the amount of flocculant injection increases as the membrane fouling index increases and stores this data in the DB (S24, S26).

The method carried out in the step S20 is effective in excluding solid deposits on the surface of the membrane by increasing the aeration amount and period through the continuous aeration method in a high turbidity period. In this condition, the operation is automatically executed by existing air cleaning methods (no aeration and intermittent aeration) until the raw turbidity becomes below the set value B. In intermittent and continuous aeration methods, the aeration intensity is determined by the membrane fouling index and derived by empirical equations. That is, as the membrane inflow turbidity increases, membrane contamination increases due to the increase in the number of particles deposited on the membrane surface, and the membrane contamination index also increases. At this time, the particles deposited on the surface by the air surface of the membrane is shaken off. If the number of particles by turbidity increases, the air cleaning amount is increased to minimize the membrane contamination by the solids.

3a and 3b show the membrane fouling index for the aeration intensity, it is used in the empirical formula of aeration intensity using the membrane fouling index.

Figures 4a and 4b is a comparison of the membrane fouling index of the low turbidity and high turbidity period for the aeration-free air cleaning method (NAF) and continuous aeration air cleaning (CAF) method, the aeration-free air in the low turbidity period The cleaning method (NAF) shows that during the high turbidity period, the continuous aeration air cleaning method (CAF) is a more efficient air cleaning method.

Figure 5 compares the membrane filtration resistance values of the aeration method (NAF, continuous method (CAF) and intermittent aeration method (PAF)) during the low turbidity period, the membrane for the air cleaning method in the low turbidity period It shows no difference in contamination.

6 shows data operated by applying a real-time intermittent aeration air cleaning method.

7 is a comparison of the energy efficiency of each aeration method (NAF, continuous method (CAF) and intermittent aeration method (PAF)), the intermittent and no aeration method is 70 ~ It shows an 80% increase in energy efficiency.

As described above, the present invention provides the most efficient management of membrane fouling in membrane separation systems targeting domestic constant intake sources with large changes in surface water quality throughout the year by controlling the aeration method and aeration intensity using membrane influent turbidity and membrane contamination index in real time. It can be suppressed.

If the influent turbidity rises below the threshold, the cause is determined by the increase in the number of dissolved organic matter and algae. In order to remove dissolved organic matter and algae, the coagulant agglomeration is controlled by adjusting the coagulant injection amount, and when the coagulant injection amount is determined by the logic operation unit 25 according to the increase and decrease rate of the membrane fouling index, the coagulant injection of the controller 26 is performed. Controlled and injected by control. At the same time, the logic operation unit 25 stores the measured turbidity, the interlude differential pressure, the membrane fouling index, and the operating conditions in a database, and utilizes them to correct the set value. Each set value can be input by the field operator, and may vary depending on the type, material and raw water quality conditions of the water treatment facility and the membrane separation module.

1 is a process diagram schematically showing the configuration of an embodiment of the optimum operation control device of the membrane separation process using the intermittent aeration air cleaning method according to the present invention.

Figure 2 is a control flow chart of the intermittent aeration air cleaning method using the membrane fouling index and online membrane inflow turbidity according to the present invention.

Figure 3a and Figure 3b is a chart showing the membrane fouling index according to the aeration intensity in the present invention.

Figures 4a and 4b is a chart comparing the aeration method according to the membrane inflow turbidity range in the present invention using the membrane fouling index.

5 is a chart comparing the membrane filtration resistance value for each aeration method in the present invention.

Figure 6 is a table showing the real-time control of aeration intensity using the membrane fouling index in the present invention.

Figure 7 is a graph showing the energy saving efficiency of the intermittent aeration type air cleaning method to calculate the energy consumption for each aeration method.

* Explanation of symbols for the main parts of the drawings

1: flow control tank 2: membrane filtration tank

3: treatment tank 4: backwash waste tank

5: defoaming tank 6: membrane module unit

7: diffuser 8: blower

9: filtration / backwash pump 10: online membrane inflow turbidimeter

11: backwash wastewater flowmeter 12: membrane filtration treated water flowmeter

13 water temperature and pH measuring instrument 14 pressure gauge for differential pressure measurement

15: pressure gauge for level control of membrane filtration tank 16: water level sensor for air separation tank

17: Automatic valve for opening and closing control 18 ~ 24: On / Off automatic valve

25: logic operation unit 26: control unit

Claims (8)

Submerged membrane module unit that consists of a plurality of membranes to filter and settle the inflow water, and a backwashing air diffuser that is installed at the bottom to generate air bubbles to minimize adsorption by turbidity on the membrane surface. Membrane filtration bath for washing; An on-line turbidimeter installed at the front end of the membrane filtration tank and measuring the turbidity of the pretreated inlet water flowing therein; A treatment tank for storing the membrane filtration water passing through the membrane filtration tank and used as backwash water of the separation membrane; A backwashing water tank installed on a drain line of the membrane filtration tank for temporarily storing a backwashing liquid submerged downward after backwashing; A centrifugal pump installed on a piping line of the treatment tank, the centrifugal pump being operated to deliver the treatment water necessary for backwashing the membrane module unit to the treatment tank; A backwash wastewater flow meter for measuring the flow rate of backwash water generated after backwashing for monitoring and control of a constant recovery rate in a continuous aeration; A membrane filtration treated water flow meter installed on a connection pipe between the centrifugal pump and the treated water tank and configured to measure the filtration flux contained in the treated water passing through the centrifugal pump; It is installed on one side of the membrane filtration water flow meter to measure the pH in order to improve the stability of the treated water in accordance with the drinking water quality standards, water temperature and pH meter with a built-in water thermometer to calculate the viscosity of the fluid by measuring the water temperature ; A pressure gauge installed on the discharge line of the membrane module unit and measuring a transmembrane pressure; It is installed on the membrane inlet pipe line of the membrane filtration tank, the filtration pipe line of the treatment tank, and the drain line of the backwash tank for the application of the intermittent aeration backwash method in the filtration and backwash of the separation membrane. An automatic valve turned on / off by; The turbidity signal of the membrane influent water measured by the online turbidimeter, the water temperature signal measured by the water temperature meter built in the water temperature and pH meter, the filtration flux measured by the membrane filtration treated water flow meter, and the intermembrane differential pressure measured by the pressure gauge. A logic operation unit which calculates and displays the turbidity increase rate, the filtration flux, and the membrane fouling index by receiving a signal for the signal; And A control unit that transmits a control signal to all devices by setting an automatic control logic (Logic) for the backwash cycle and the backwash method using the turbidity increase rate and the membrane contamination index calculated by the logic operation unit. Optimal operation control system of the membrane separation process using an intermittent aeration air cleaning method comprising a. The method of claim 1, A degassing tank installed on the treated water pipe line of the treated water tank to remove air generated in the conduit when the raw water is filtered using the separator; And Deaeration tank level sensor for controlling the level of the deaeration tank Optimal operation control system of the membrane separation process using an intermittent aeration air cleaning method further comprising. A first step of measuring a turbidity of membrane inflow water introduced into the membrane filtration tank from the outside through an online turbidimeter; Water temperature measurement by a water temperature meter built in a water temperature and pH measurement system, a filtration flux flow rate measurement through a membrane filtration water flow meter, and a transmembrane pressure (TMP) through a pressure gauge step; A third step of calculating a membrane fouling index (MFI) based on the water temperature measured in the second step, the filtration plus flow rate, and the intermembrane pressure difference (TMP); A fourth step of determining the aeration intensity with the membrane contamination index calculated in the third step and performing aeration / intermittent aeration filtration; A fifth step of comparing and determining the magnitude of the membrane contamination index and the magnitude of the first set value, and maintaining the current operating condition if the membrane contamination index is smaller than the first set value and storing the data in a DB; When the membrane fouling index exceeds the first set value in the fifth step, the turbidity of the inflow source water is greater than the second set value by comparing / determining the magnitude of the turbidity of the inflow source and the second set value of the inflow turbidity. A sixth step of converting from the aeration / intermittent air cleaning method to the continuous aeration air cleaning method if large; A seventh step of performing a fourth step if it is determined that the turbidity of the inflowed water is smaller than the second set value after the sixth step; And If it is determined that the turbidity of the inflow source water is less than the second set value, the eighth step of increasing the injection amount of the flocculant according to the increase in the membrane fouling index and stores this data in the DB Optimal operation control method of the membrane separation process using an intermittent aeration air cleaning method comprising a. The method of claim 3, wherein The first step is Optimal operation control method of membrane separation process using intermittent aeration type air cleaning method including measuring membrane influent turbidity in real time to cope with instantaneous water quality fluctuation. The method of claim 4, wherein The turbidity data collected by the on-line turbidimeter is used to control the logic calculation unit using a 1 minute average value. If this value is 30 minutes or more higher than the second set value, the air cleaning method is converted, but the membrane contamination index value is Optimal operation control method of membrane separation process using intermittent aeration type air cleaning method characterized by controlling the air cleaning method to be changed at the time of change of membrane fouling index value. The method according to any one of claims 3 to 5, The fourth step is Water temperature, filtration plus flow rate and inter-membrane differential pressure (TMP) are measured in real time by membrane filtration treated water flow meter, water temperature and pH meter and pressure gauge, respectively. A method for optimal operation control of a membrane separation process using an intermittent aeration type air cleaning method, characterized in that the intermittent aeration type air cleaning method is determined by comparing the calculated membrane contamination index value and the set value of the membrane contamination index value. The method of claim 5, The membrane fouling index is the optimum operation control method of the membrane separation process using the intermittent aeration type air cleaning method characterized in that it is calculated by the following [Equation 1] and [Equation 2]. [Equation 1]

[Equation 2]

Where MFI is the membrane fouling index, V is the total volume filtered during the reference time to calculate the membrane fouling index, ie the volume measured from time t1 to t1 + n hours, and ΔP is the membrane filtration pressure (TMP). Where A is the surface area, μ is the viscosity coefficient, FI is the measure of membrane fouling, Q _i is the initial permeate flow value, i.e. the initial operation after backwashing. When the flow rate is filtered, Q _f is the final permeate flow, R _i is the membrane's own filtration resistance value (superfiltration resistance value), and R _f is the filtration resistance due to the membrane contaminant (filtration before backwashing). Resistance value), Q _i is the initial permeate flow value, V is the total volume of the filtered water (m 3) obtained between the time t and t + n, respectively. The method according to any one of claims 3 to 5, The membrane influent turbidity data calculated in the first step and the membrane contamination index data calculated in the third step are displayed to the plant manager and the intermittent aeration type filtration and backwashing method is determined through the manager's prediction, or the membrane influent turbidity is determined. Optimal operation control method for the membrane separation process using the intermittent aeration type air cleaning method characterized in that the intermittent aeration type filtration and backwashing method is determined by linking the data and the membrane contamination index data with an external process control unit.

Images