KR100728739B1 - Automatic control apparatus in AOP Advanced Oxidation Process using Hydrogen Peroxide-CT control unit and the control method - Google Patents

Abstract

The present invention is to solve the problem that can not implement the control of the oxidation performance of the conventional advanced oxidation process, to measure the residual hydrogen peroxide concentration in real time in the advanced oxidation process (AOP: Advanced Oxidation Process), hydrogen peroxide-CT (oxidation capacity) control The present invention relates to an automatic control apparatus and a control method of the advanced oxidation process (AOP), which is used to continuously measure and control the injection amount of hydrogen peroxide (H ₂ O ₂ ), which is a key operating factor of the advanced oxidation process (AOP). The present invention relates to an automatic control apparatus and a control method of an advanced oxidation process (AOP).

Therefore, according to the present invention, by operating to satisfy the hydrogen peroxide-CT value in the advanced oxidation process (AOP), it is possible to treat the water in response to the water quality change of the influent, to ensure the stability of the treated water quality, and to be linked to the automatic control system. In addition, it can be easily applied to the air-injected ozone process or advanced oxidation process (AOP), and it is possible to precisely calculate the hydrogen peroxide injection amount and always maintain the proper concentration, thereby implementing operational optimization such as energy saving of the hydrogen peroxide injection facility.

Advanced oxidation process (AOP), hydrogen peroxide injection amount determination, real time flow measurement device, OH radical, advanced oxidation process (AOP) control unit, automatic control

Description

Automatic control apparatus in AOP (Advanced Oxidation Process) using Hydrogen Peroxide-CT control unit and the control method}

1 is a schematic configuration diagram of an automatic control apparatus of an advanced oxidation process (AOP) using a real-time hydrogen peroxide-CT control unit according to an embodiment of the present invention.

Figure 2 is a schematic flowchart showing a control method of an advanced oxidation process (AOP) using the hydrogen peroxide measuring device and the flow rate measuring device according to the present invention.

Figure 3 is a detailed configuration of the hydrogen peroxide measuring device according to the present invention.

Figure 4 is a time flow chart showing the various valve opening and closing procedures of the hydrogen peroxide measuring device for real-time hydrogen peroxide concentration measurement according to the present invention.

5 is a chemical formula for the principle of the hydrogen peroxide measuring method applied to the continuous measuring method of the hydrogen peroxide measuring apparatus.

Figure 6 is a schematic layout of the hydrogen peroxide measuring device according to the present invention.

Figure 7 is a graph of the results of the operation for the hydrogen peroxide concentration continuously measured in proportion to the injection ozone concentration as an example of operation according to the hydrogen peroxide-CT control of the advanced oxidation process (AOP) according to the present invention.

Figure 8 is a graph of the treatment efficiency of the UV absorbing material (UV ₂₅₄ ) in the advanced oxidation process (AOP) during hydrogen peroxide-CT control of the advanced oxidation process (AOP) according to the present invention.

* Explanation of symbols for the main parts of the drawings

 1: raw water inflow pipe 2: inflow flow meter

 3: Advanced oxidation process (AOP) contact facility 4: UV lamp

 5: treated water outlet pipe 6: hydrogen peroxide injection pump

 7: hydrogen peroxide storage tank 8: ozone generator

 9: Ozone Occurrence Monitor 10: Hydrogen Peroxide Measuring Device

 11: hydrogen peroxide-CT control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic control apparatus and a control method of an advanced oxidation process (AOP) by continuous measurement of hydrogen peroxide. More specifically, the present invention relates to hydrogen peroxide-CT (Concentration × Contact Time) according to the inflow flow rate and the residual hydrogen peroxide concentration, that is, from the value indicating the oxidation ability of hydrogen peroxide in the AOP contact facility. The present invention relates to an automatic control apparatus and method for an advanced oxidation process (AOP) using a hydrogen peroxide-CT control unit that automatically controls the injection concentration of hydrogen peroxide, which is a key driving factor of the process.

In general, ozone treatment, which is a technology to purify raw water using ozone (O ₃ ), is a water purification method that removes impurities in water with ozone having strong oxidizing power. It uses the reactivity with and is much better than the conventional chlorine treatment.

In addition, ozone has various advantages over other oxidizing agents such as chlorine in process installation and operation, and oxidizing power, and also removes some heavy metals such as iron and manganese, and removes contaminants such as phenol and hardly decomposable substances. It also shows an excellent effect, and is known to be excellent in the removal effect on the organic substances in the water. And best of all, it does not make trihalomethane (THM), a carcinogen that can occur during chlorine disinfection, and tastes good because it does not have a unique smell like chlorine.

As a result, a lot of water purification technologies using oxidizing power of ozone have been studied. Generally, water purification technology using oxidizing power of ozone has more ozone process using ozone alone and more OH radicals affecting oxidation power during ozone treatment. The advanced oxidation process (AOP), which improves the oxidative power by injecting hydrogen peroxide (H ₂ O ₂ ) simultaneously with ozone to produce, is widely used, and is controlled to generate more OH radicals in the advanced oxidation process (AOP). As a factor, pH adjustment and ultraviolet (UV) irradiation may be used.

Among these, ozone process is divided into pre-ozone process and post-ozone process according to the installed position among the whole water treatment system. Advanced oxidation process (AOP) is a water purification technology that is being put into practical use in the world. .

In the ozone process, the purpose is to improve the flocculation and sedimentation efficiency, remove iron and manganese, remove algae, remove taste and odor-causing substances, and remove color. It is introduced to remove substances, increase the biodegradability of hardly degradable organic substances, remove trihalomethane precursors (THMFP), which are carcinogens, and disinfect pathogenic microorganisms.

In general, the ozone control method is based on the results obtained from pilot experiments, and a proportional control method for injecting ozone in proportion to the inflow flow rate and a residual ozone control method for maintaining the residual ozone concentration in the effluent are used. In addition, the ozone injection amount is controlled by the ozone generation concentration of the ozone generator and the air volume of the ozonated air.

On the other hand, in the ozone process, real-time control of ozone injection concentration is not performed according to the change of inflow water quality, and verification of treatment efficiency is insufficient because it is difficult to evaluate the efficiency and operability during ozone treatment. In addition, the impact on the Biological Activated Carbon (BAC) process, which is a successor to the after ozone process, is unclear, and thus, the field workers complain a lot of difficulty in setting an appropriate injection concentration. Control measures for oxidized by-products have not been established.

In addition, the change in inflow flow rate is not reflected, and the ratio of inflow flow rate to ozone injection flow is excessively changed, resulting in the possibility of overinjection of ozone, adverse effects on the subsequent bioactive carbon process, and overproduction of oxidative by-products. The possibility is also very high.

Therefore, the selection of control factors is very important for the construction of the automatic control system in the ozone process and the advanced oxidation process (AOP), and it takes a lot of time and effort for the field application.

In order to solve this problem, changes in inflow flow should be reflected in the control system.In order to construct an automatic control system, the introduction of a real-time water quality analysis device that analyzes water quality automatically and the data derived from these results can be controlled by database. Although the introduction of the expert system is required, the data collection through pilot experiment is essential for reflecting the fluctuations in the inflow flow and optimizing the proportional control method by introducing the automatic water quality analysis device and expert system. It is difficult to expect the optimum driving effect because there is a limit in reflecting the water quality characteristics of raw water analyzed by the automatic water quality analysis device to the control system.

In addition, the advanced oxidation process (AOP) has the biggest purpose for the oxidation of trace organic pollutants, so in order to satisfy the sufficient oxidation conditions for the pollutants, it is necessary to introduce a control method for the oxidation ability. There is a problem in that it is impossible to implement oxidative control.

In order to solve the above problems, first, the change of inflow flow rate and the change of hydrogen peroxide-CT value which can evaluate the radical oxidation ability in the contact facility in the advanced oxidation process (AOP) of the water treatment system should be reflected in the water treatment control system. The hydrogen peroxide-CT value in the AOP contact facility should be set and controlled, but according to the prior art, problems such as real-time hydrogen peroxide measuring device and applicability to control factors cannot be solved.

The present invention has been proposed to solve the above problems, the first object of the present invention is to measure the hydrogen peroxide-CT using a real-time hydrogen peroxide measuring device in the advanced oxidation process (AOP), and reflects this as a driving factor Maintain stable hydrogen peroxide-CT in the contact point of the oxidation process, respond to changes in water quality and quantity in real time, secure the safety of treated water, connect to existing treatment facilities, and analyze the results of the real-time hydrogen peroxide measuring device. The purpose of the present invention is to provide an automatic control apparatus and method for an advanced oxidation process capable of accurate hydrogen peroxide-CT control.

The second object of the present invention is to always satisfy the hydrogen peroxide-CT value set to utilize the residual hydrogen peroxide concentration measured in real time through the on-line hydrogen peroxide measuring device installed at one end of the pipe flowing into the high oxidation process in the water treatment system. An AOP automatic control apparatus for controlling and a method thereof are provided.

The present invention is an advanced oxidation process (AOP) contact facility that raw water is introduced, and ozone and UV lamps or ozone and hydrogen peroxide are selectively supplied and reacted; A hydrogen peroxide measuring device connected to the AOP contact facility to measure residual hydrogen peroxide concentration with respect to the effluent; An ozone generator for supplying ozone to the advanced oxidation process (AOP) contact facility; An inflow flow meter for measuring the flow rate flowing into the advanced oxidation contacting facility; A hydrogen peroxide supply device for supplying hydrogen peroxide to the highly oxidative contact facility; And an advanced oxidation process using a hydrogen peroxide-CT control unit including a hydrogen peroxide CT control unit connected to the inflow flow meter, the hydrogen peroxide measuring device, the hydrogen peroxide supply device, and the ozone generator to control the supply amount of hydrogen peroxide according to each measured value. AOP) provides automatic control device.

In addition, the present invention measures the inflow flow rate of the raw water flowing into the advanced oxidation process (AOP) contact facility through the inflow flowmeter, and the residual hydrogen peroxide concentration of the raw water passing through the advanced oxidation process (AOP) contact facility through the hydrogen peroxide measuring device Measured in real time, the CT value is calculated in the hydrogen peroxide-CT control unit by the residual hydrogen peroxide concentration measured in real time through the hydrogen peroxide measuring device and the inflow flow rate measured by the inflow flow meter, and is set by the operator of the water treatment system. Comparing the CT value with the measured residual hydrogen peroxide concentration to determine whether the deviation is less than the predetermined ratio, and if the injection amount of hydrogen peroxide is determined according to the deviation determination, the ozone generator and the hydrogen peroxide injection pump are determined according to the determined injection amount. The hydrogen peroxide measuring device and the flow measuring device that It provides a control method for the advanced oxidation process (AOP).

If the CT value is different from the CT value set by the measured residual hydrogen peroxide concentration or more than the predetermined ratio, the CT value set by the measured inflow flow rate and the residual hydrogen peroxide concentration is obtained, and the hydrogen peroxide injection amount is requested to the database. It is desirable to determine. Moreover, it is preferable that the predetermined ratio of the deviation of the CT value by the set CT value and the measured residual hydrogen peroxide concentration is 10%.

The present invention made as described above is to measure the flow rate of the inflow water flowing into the advanced oxidation process (AOP) of the water treatment system and the residual hydrogen peroxide concentration in real time to calculate the proper injection concentration of hydrogen peroxide and to control the hydrogen peroxide supply pump to automatically inject the appropriate amount Therefore, the water quality to be treated is controlled constantly, so that it can respond in real time to the inflow of raw water and changes in the water quality, thereby making the water treatment safe and reliable.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention for realizing the above objects will be described with reference to the accompanying drawings so that those skilled in the art can 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 schematic configuration diagram of an automatic control apparatus for an advanced oxidation process (AOP) using a real-time hydrogen peroxide-CT control unit according to an embodiment of the present invention. As shown in the drawing, the automatic control apparatus according to the present invention is a circle. Water inlet pipe (1), inflow flowmeter (2), advanced oxidation process (AOP) contact facility (3), UV lamp (4), treated water outlet pipe (5), hydrogen peroxide injection pump (6), hydrogen peroxide storage tank (7) , An ozone generator 8, an ozone generator 9, a hydrogen peroxide measuring device 10, and a hydrogen peroxide-CT control unit 11.

The advanced oxidation process (AOP) contact facility (2) is for supplying and reacting ozone and UV lamps or ozone and hydrogen peroxide to the raw water introduced by the raw water inlet pipe (1), the inflow flowmeter (2) is the crude oil It is mounted on one side of the entrance tube 1. In addition, the hydrogen peroxide measuring device 10 is installed to be connected to the advanced oxidation process (AOP) contact facility (3) to measure the residual hydrogen peroxide concentration in the effluent of the advanced oxidation process (AOP) contact facility in real time. In addition, the hydrogen peroxide injection pump (6) is for supplying hydrogen peroxide stored in the hydrogen peroxide storage tank (7) to the advanced oxidation process (AOP) contact facility (3), the ozone generator (8) generates ozone to the It is for supplying to the advanced oxidation process (AOP) contact facility, the generation ozone monitor (9) is connected to the ozone generator (8) to measure the concentration of ozone supplied to the advanced oxidation process contact facility (3), The hydrogen peroxide-CT control unit 11 is connected to an inflow flowmeter (2), a real-time hydrogen peroxide measuring device (10), a hydrogen peroxide injection pump (6), an ozone generator (8), and an ozone generating monitor (9) to measure the respective measured values. According to control the amount of hydrogen peroxide supplied.

As described above, the operation and operation relationship of the automatic control device of the advanced oxidation process (AOP) using the real-time hydrogen peroxide-CT control unit according to an embodiment of the present invention will be described in detail.

First, when raw water flows into the AOP contact facility (2) by the induction of the raw water inlet pipe (1), the raw water is selectively supplied by treating ozone and UV lamps or ozone and hydrogen peroxide, and the inflow flowmeter ( 2) measures the flow rate of the incoming raw water and transmits the measurement result to the hydrogen peroxide-CT control unit (11).

In addition, in the hydrogen peroxide measuring apparatus 10 connected to the advanced oxidation process (AOP) contact facility 3, the advanced oxidation process (AOP) contact facility 3 passes through the analysis procedure of the real-time hydrogen peroxide continuous measurement device shown in FIG. The residual hydrogen peroxide concentration of the raw water is measured in real time, and the measurement results are transmitted to the CT control unit 11.

The analysis principle of the real-time hydrogen peroxide measuring device according to the present invention is applied to FIA (Flow Injection Analysis) using the fluorescence detection method shown in FIG. The measurement principle of the fluorescence detection method of hydrogen peroxide is a method due to the reduction of hydrogen peroxide. It forms a dihydroxybiphenyl derivative, which is produced exactly stoichiometrically so that the concentration of peroxide can be measured accurately. (λ max (exitation) = 320 nm, λ max (emission) = 400 nm).

The hydrogen peroxide-CT control unit 11 calculates the CT value by using the measured value transmitted from the inflow flow meter 2 and the hydrogen peroxide measuring device 10, and compares the injection concentration of hydrogen peroxide with the CT value set by the driver. Decide

Therefore, in the water treatment system according to the present invention, the raw water is guided through the raw water inflow pipe (1) and supplied to the advanced oxidation process (AOP) contact facility (2), and the inflow flowmeter (2) is installed in the raw water inflow pipe (1). The flow rate of the raw water is measured, and the measured flow rate is transmitted to the hydrogen peroxide-CT control unit 11 and analyzed by the real-time hydrogen peroxide measuring device 10 connected to the advanced oxidation process (AOP) contact facility (3). The residual hydrogen peroxide concentration is transmitted to the hydrogen peroxide-CT control unit 11 to calculate the hydrogen peroxide-CT value by multiplying the residual hydrogen peroxide concentration value by the residence time of the advanced oxidation process (AOP).

This CT value can be abbreviated to the simplified function shown in equation (1).

(Equation 1)

CT (mg / L × min) = ∑ (C × T),

C (mg / L) is the residual hydrogen peroxide concentration in the AOP contact facility,

T (min) is the residence time of the advanced oxidation process (AOP) contact facility.

Therefore, the control value of the real-time hydrogen peroxide measuring device 10 is variably controlled so that the CT value calculated by Equation 1 converges to the CT value set by the driver. That is, for example, when the CT value set by the driver is 1.0 mg / L × min, and the residence time of the AOP contact facility 3 is 10 minutes, the CT control unit 11 is ozone / altitude. The amount of hydrogen peroxide is automatically controlled so that the residual hydrogen peroxide concentration of the treated water measured by the real-time hydrogen peroxide measuring device 5 of the AOP contacting facility 3 becomes 0.1 mg / L, and the inflow of raw water is reduced to When the residence time of the oxidation process (AOP) contacting equipment 3 is increased to 20 minutes, the amount of hydrogen peroxide is automatically controlled so that the residual hydrogen peroxide concentration of the treated water analyzed by the real-time hydrogen peroxide measuring apparatus 10 is 0.05 mg / L.

As described above, the present invention allows optimal CT control by changing the set value of the residual hydrogen peroxide concentration in real time in consideration of the change in residence time according to the change of the inflow flow rate. That is, the hydrogen peroxide injection concentration of the advanced oxidation process (AOP) is set to satisfy the CT value set by the driver to determine and control the hydrogen peroxide injection amount according to Equation 2.

(Equation 2)

Hydrogen peroxide injection rate (mg / min) = inflow flow rate (L / min) x hydrogen peroxide injection concentration (mg / L),

Inflow flow rate (L / min) is a real-time measurement of the inflow flowmeter,

The hydrogen peroxide injection concentration (mg / L) is an injection concentration that satisfies the set CT value.

Therefore, the ozone generator 9 controls the hydrogen peroxide injection pump 7 in the CT control unit 11 according to the ozone injection amount determined by the above equation and automatically injects the ozone generator 9.

In other words, the advanced oxidation process (AOP) plays an important role in the water treatment of OH radicals generated as intermediates in the process of ozone decomposing, and artificially accelerates ozone decomposition using hydrogen peroxide or UV lamps to generate OH radicals. By increasing, organic matter decomposition is promoted. In addition, since most of the advanced oxidation process (AOP) has the biggest purpose for the oxidation of trace organic pollutants, the introduction of hydrogen peroxide-CT control method is required to satisfy the sufficient oxidation conditions for pollutants.

This is because it is not possible to measure the radicals generated in the AOP reaction in real time, and thus it is possible to evaluate the AOP oxidation ability through the real-time analysis of the hydrogen peroxide concentration which directly affects the radical formation.

In addition, a conventional control method for controlling the hydrogen peroxide injection amount in the advanced oxidation process (AOP) is the injection ozone concentration proportional control method. The injection ozone concentration proportional control technique is a technique for controlling the hydrogen peroxide injection concentration at a constant rate with respect to the ozone injection concentration. However, the method of determining ozone injection concentration should be able to measure the amount of inflow water, receive the ozone injection concentration from the ozone control device in real time, control the hydrogen peroxide injection concentration, and establish it in conjunction with the automatic ozone injection control system. As a result, a problem may occur that the hydrogen peroxide injection amount to inject radicals to promote the radical reaction.

Therefore, the hydrogen peroxide-CT control method according to the present invention is implemented by controlling based on the hydrogen peroxide-CT value in the advanced oxidation process (AOP) contact facility obtained through real-time residual hydrogen peroxide concentration and influent flow rate. The hydrogen peroxide-CT control method requires a real-time hydrogen peroxide measuring device separately, but utilizes hydrogen peroxide as a direct control factor to promote radical reaction of the advanced oxidation process (AOP) as compared to the existing control method to change the water quality of raw water. Active and real-time response is possible, and the safety and stability of the treated water can be promoted.

In addition, since the automatic control system can be easily connected, and the required amount of hydrogen peroxide is accurately calculated according to the water quality, the proper concentration can be maintained at all times, so that the energy consumption of the ozone generating facility and the operation of the hydrogen peroxide injection facility can be optimized.

Next, the automatic control method of the advanced oxidation process (AOP) using the hydrogen peroxide-CT control unit according to the present invention will be described in detail with reference to FIG.

First, the raw water flowing into the water treatment system and introduced into the advanced oxidation process (AOP) contact facility 3 through the induction of the raw water inflow pipe 1 measures the inflow flow rate through the inflow flow meter 2 (S10).

Then, the residual hydrogen peroxide concentration of the raw water passing through the advanced oxidation process (AOP) contact facility (2) is measured in real time by the hydrogen peroxide measuring apparatus (5).

The CT value is calculated by the hydrogen peroxide-CT control unit 11 based on the residual hydrogen peroxide concentration measured in real time by the hydrogen peroxide measuring apparatus 10 and the inflow flow rate measured by the inflow flow meter 2 (S30).

Next, the CT value set by the driver of the water treatment system is compared with the CT value of the measured residual hydrogen peroxide concentration, and it is determined whether the deviation is less than the predetermined ratio (S40), and if the deviation of the CT value is less than the predetermined ratio, In consideration of the inflow flow, the injection amount of hydrogen peroxide is determined (S50). It is preferable that the predetermined ratio of the deviation of the CT value set by the CT value set at this time and the measured residual hydrogen peroxide concentration is 10%.

However, if the difference between the CT value set and the CT value due to the measured residual hydrogen peroxide concentration is 10% or more, the CT value set for the residence time of the advanced oxidation process contacting facility 3 determined according to the measured inflow flow rate is determined. The residual hydrogen peroxide concentration value of the real-time hydrogen peroxide measuring device 5 for obtaining is newly set, and in order to satisfy the newly set residual hydrogen peroxide concentration value, the hydrogen peroxide injection amount is requested to the database stored in the CT control unit 11 (S60) to inject hydrogen peroxide. Will be determined.

Next, when the injection amount of hydrogen peroxide is determined, the hydrogen peroxide injection pump 7 is adjusted (S70) according to the determined injection amount, and hydrogen peroxide is injected (S110).

Figure 3 is a detailed configuration of the hydrogen peroxide measuring device of the FIA (Flow Injection Analysis, flow injection method) using the fluorescence detection according to the present invention, Figure 4 is a valve opening and closing of various valves of the hydrogen peroxide measuring device for real-time hydrogen peroxide concentration measurement according to the present invention A time flow chart showing the sequence.

Basically, injection of reagents and samples is controlled by an electrically controlled DC control motor pump to continuously inject two reagents (NaOH, Fluorescence Reagent) and the sample to react at a constant rate. It also has a series of solenoid valves that can be electrically controlled for each reagent and sample mixing sequence and measurement. In addition, in order to prevent interference of residual ozone during the analysis of hydrogen peroxide, Na ₂ S ₂ O ₃ reagent, which is a reducing agent, is continuously provided with a metering pump capable of controlling the flow rate.

Hereinafter, the progress of each step will be described in detail.

First, the continuous measurement “PRECLEANING” step uses distilled water to remove the remaining reaction sample from the previous measurement and zero the fluorescence detector.

In the "SAMPLE INPUT" step, which continuously injects sample water into the pump after the "PRECLEANING" step, the valve is operated to continuously inject sample water to measure hydrogen peroxide.

Next, in the “FLUORESCENCE REAGENT INPUT” step, the valve is operated to inject a fluorescence reagent containing a proportion of potassium hydrogen phtalate, peroxidase and p-hydroxyphenyl acetic acid to form a polymer compound for analysis with a fluorescence detector.

Next, in the “NaOH INPUT” step, the valve was operated to inject NaOH to adjust the pH, and in the “DETECTION” step, the polymer injected by the fluorescence detector was measured at excitation: 320 nm and emission: 420 nm to represent the hydrogen peroxide concentration.

After that, in the ″ RETURN TO BLANK ”step, the sample water injected in the“ PRECLEANING ”step, the fluorescence reagent and NaOH are stopped, and distilled water is injected to check whether it is at zero.

5 is a measurement principle of the fluorescence detection method of hydrogen peroxide, hydrogen peroxide oxidizes p-hydroxyphenylacetic acid by a peroxidase catalyst to form a 2,2-dihydroxybiphenyl derivative in a method due to the reduction of hydrogen peroxide, which is produced exactly stoichiometrically Therefore, the concentration of peroxide can be measured accurately (λ max (exitation) = 320 nm, λ max (emission) = 400 nm).

Figure 6 schematically shows the configuration of the hydrogen peroxide measuring device according to the present invention, Figure 7 is continuously measured in proportion to the injection ozone concentration according to the hydrogen peroxide-CT control unit of the advanced oxidation process (AOP) according to the present invention The operating results for the concentration of hydrogen peroxide are shown.

As a result, it can be seen that the residual hydrogen peroxide was maintained in a stable state after a certain time in the contact tank, and the residual hydrogen peroxide also increased as the amount of ozone injected increased. In addition, hydrogen peroxide-CT control is possible because residual hydrogen peroxide is maintained at a constant concentration according to the ozone injection amount in the advanced oxidation process (AOP).

Figure 8 is a schematic graph of the treatment efficiency of the UV absorbing material (UV ₂₅₄ ) in the advanced oxidation process (AOP) during hydrogen peroxide-CT control of the advanced oxidation process (AOP) according to the present invention, as shown in the graph The UV ₂₅₄ removal efficiency was the highest at 70% when the ozone dose was 0.67 mg / L, and the UV ₂₅₄ removal efficiency did not increase any more even when the ozone dose was increased to 0.67 mg / L or more. In addition, the concentration of residual hydrogen peroxide also increased proportionally as the amount of ozone injection increased to 1.06 mg / L, similar to the trend of UV ₂₅₄ removal efficiency. have. Thus, when ozone injection amount is 0.67-1.06 mg / L, UV ₂₅₄ and residual hydrogen peroxide show a similar tendency, so the residual hydrogen peroxide concentration can be applied as a control factor to maintain the optimum removal efficiency of organic matter at the proper ozone injection concentration. Indicates.

In addition, when the hydrogen peroxide-CT value was calculated by applying the residual hydrogen peroxide concentration, the optimal hydrogen peroxide-CT was determined to be 1.3-1.7 mg / L × min at 10 minutes of contact time. In other words, the result is that by maintaining a constant CT value of hydrogen peroxide, the advanced oxidation process (AOP) can be operated under optimum conditions irrespective of the quality of the raw water and the amount of influent.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, conversions, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention can be controlled in real time by calculating the injection concentration of hydrogen peroxide that satisfies the appropriate hydrogen peroxide-CT value of the advanced oxidation process (AOP) from the hydrogen peroxide concentration and the inflow flow in the advanced oxidation process (AOP), By applying this automatic control device to the advanced oxidation process (AOP) system, it is possible to control the optimized high-purity water treatment and to treat the water in response to changes in the water quality and quantity, thereby ensuring the stability of the treated water quality and automatically controlling the water. Not only can it be linked to the system, but it can be easily applied to the air-introduced ozone process, and it is possible to optimize the energy consumption and operation of hydrogen peroxide by accurately calculating the required amount of hydrogen peroxide injected according to the water quality and maintaining the proper concentration at all times. Automatic control system and control method of advanced oxidation process (AOP) using hydrogen peroxide-CT control unit Has the effect of providing.

Claims (8)

An advanced oxidation process (AOP) contact facility in which raw water is introduced and ozone and hydrogen peroxide are supplied and reacted; A hydrogen peroxide measuring device connected to the advanced oxidation process (AOP) contact facility and equipped with a fluorescence detector for measuring in real time the residual hydrogen peroxide concentration of the effluent by a fluorescence detection method; An ozone generator for supplying ozone to the advanced oxidation process (AOP) contact facility; An inflow flow meter for measuring the flow rate flowing into the advanced oxidation contacting facility; A hydrogen peroxide supply device for supplying hydrogen peroxide to the highly oxidative contact facility; And A hydrogen peroxide CT control unit is connected to the inflow flow meter, the hydrogen peroxide measuring device, the hydrogen peroxide supply device, and the ozone generator to control the supply amount of hydrogen peroxide according to each measured value. Automatic control of advanced oxidation process (AOP) using hydrogen peroxide-CT control unit. The method of claim 1, The advanced oxidation contact equipment Further comprising a UV lamp for providing ultraviolet light Automatic control of advanced oxidation process (AOP) using hydrogen peroxide-CT control unit. The method of claim 1, The hydrogen peroxide measuring device Two reaction reagents are formed to oxidize the effluent and P-hydroxyphenylacetic acid by a peroxidase catalyst to form a 2,2-dihydroxybiphenyl derivative. Metering pump device for continuously injecting NaOH, Fluorescence Reagent (Fluorescence Reagent) at a constant ratio; A continuous reaction module allowing the effluent of the contact equipment and the two reaction reagents to react by the metering pump device; And It includes a fluorescence detector for measuring the hydrogen peroxide concentration by the sample reacted in the continuous reaction module device Automatic control of advanced oxidation process (AOP) using hydrogen peroxide-CT control. The method of claim 1, The ozone generator is connected to the ozone generator further comprises a ozone monitor for measuring the concentration of ozone supplied to the advanced oxidation process (AOP) contact facility Automatic control of advanced oxidation process (AOP) using hydrogen peroxide-CT control. Inflow flow rate of raw water flowing into AOP contact facility is measured by inflow flowmeter, Residual hydrogen peroxide concentration in the raw water passing through the advanced oxidation process (AOP) contact facility is measured in real time through a hydrogen peroxide measuring device by a fluorescence detection method using a fluorescence detector, The CT value is calculated by the hydrogen peroxide-CT control unit by the residual hydrogen peroxide concentration measured in real time through the hydrogen peroxide measuring device and the inflow flow rate measured by the inflow flow meter. The CT value set by the operator of the water treatment system and the CT value based on the measured residual hydrogen peroxide concentration are compared to determine whether the deviation is less than the predetermined ratio, When the injection amount of hydrogen peroxide is determined according to the deviation determination, the ozone generator and the hydrogen peroxide injection pump are adjusted according to the determined injection amount, Injecting hydrogen peroxide Control method of advanced oxidation process (AOP) using hydrogen peroxide measuring device and flow measuring device. The method of claim 5, If the deviation of the CT value between the set CT value and the measured residual hydrogen peroxide concentration is less than the predetermined ratio, the amount of hydrogen peroxide injected is determined in consideration of the inflow flow rate. Control method of advanced oxidation process (AOP) using hydrogen peroxide measuring device and flow measuring device. The method of claim 5, When the deviation between the CT value set by the measured CT value and the measured residual hydrogen peroxide concentration is 10% or more, the real-time hydrogen peroxide measuring device for obtaining the CT value set for the residence time of the AOP contact equipment determined according to the measured inflow flow rate. The residual hydrogen peroxide concentration value is newly set, In order to satisfy the newly set residual hydrogen peroxide concentration value, the hydrogen peroxide injection amount is requested to the database stored in the CT control unit to determine the hydrogen peroxide injection amount. Control method of advanced oxidation process (AOP) using hydrogen peroxide measuring device and flow measuring device. The method according to claim 5 or 6, The predetermined ratio of the deviation of the CT value by the set CT value and the measured residual hydrogen peroxide concentration is 10%. Control method of advanced oxidation process (AOP) using hydrogen peroxide measuring device and flow measuring device.

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