KR20190032919A - Water treatment apparatus and method using ozone pretreatment - Google Patents

Abstract

The present invention relates to a water treatment apparatus and a water treatment method. More particularly, the present invention relates to a water treatment method using ozone pretreatment which goes through a pretreatment membrane process, a main treatment membrane process, and a biological concentrated water treatment process in order to produce treated water of high quality, and performs ozone treatment before the pretreatment membrane process and the main treatment membrane process to reduce electricity consumption, reduce membrane contamination, enhance permeation performance, and produce treated water of high quality. The concentrated water containing the high concentration of organic matter, nitrogen, phosphorus, and the like produced in the membrane further enhances biological treatment efficiency by discharged ozone treatment of the pretreatment. The concentrated water is treated with a biological filtration process which is high-density biological treatment, so that the final treated water can meet the water quality standard of effluent.

Description

TECHNICAL FIELD [0001] The present invention relates to a water treatment apparatus and a method using ozone treatment,

The embodiment relates to a water treatment apparatus and a method using ozone treatment. More particularly, the present invention relates to a process for producing high-quality treated water, which comprises a pretreatment separation membrane process, a main treatment separation membrane process, and a biological concentrated water treatment process, and reduces power consumption by ozone treatment of raw water before a pretreatment separation membrane process and a main treatment separation membrane process, It improves membrane pollution and permeation performance, produces high quality treated water, and concentrated water containing high concentrations of organic matter, nitrogen, phosphorus, etc. generated in the membrane improves the biological treatment efficiency by pretreatment of ozone treatment, And a biore filtration process which is a high-density biological treatment so that the final treatment water can meet the water quality standard of effluent water.

Recently, water demand is gradually increasing due to population growth, climate change, urbanization, and industrial development, but water supply is limited and technology development for securing sustainable water resources is emerging.

Since wastewater has the advantages of small fluctuation in quantity, it can be used as an alternative water resource because it has a condition to supply stable water resources. When producing high-quality water using a membrane, it can be reused as various kinds of water such as agricultural water, heavy water, indirect drinking water, industrial water, boiler water, etc., thereby alleviating the local imbalance in the supply and demand of water and improving the ecosystem recovery and hydrophilic function.

However, the treated wastewater treatment plants are not completely treated with endocrine disruptors, heavy metals, pharmaceuticals, cosmetics, personal care and hygiene components and persistent organic compounds that are not legally regulated. It is reported to be discharged.

These materials are substances that can threaten human health and must be removed through coagulation, adsorption, oxidation process, or re-used as separation membrane process capable of producing high purity water. Recent separation membrane processes are increasingly being applied in a wider range as techniques for improving permeability, operational protocol factors, physico-chemical cleaning, and membrane fouling reduction are being progressively improved. Membrane process can secure reliable quality of treated water compared to existing process, and it can reduce land area because it has high density compared to existing facilities. It also has the advantage of being able to reduce the use of chemicals, easy to implement automation, and to link with other processes.

Despite the advantages of membrane process technology, however, permeation performance is reduced due to membrane contaminants in the wastewater. Membrane fouling is caused by the deposition of contaminants on the surface of the membrane and formation of a contaminant layer, or adsorption or pore clogging in the pores. When membrane contamination is intensified, high pressure is required due to the increase in resistance. Which leads to a shortening of the lifetime of the membrane.

Various methods such as physical / chemical backwash, cleaning in place (CIP) and maintenance chemical cleaning (MCC) can be applied to reduce membrane contamination, The second problem such as the treatment of waste water for cleaning and lowering the operation rate of the membrane process, and lowering the operational efficiency in terms of maintenance. Therefore, a water treatment process capable of stable filtration is required in order to prevent the entry of such contaminants into the membrane process in advance.

In addition, the concentrated water of the RO process generated during the production process for water reuse includes organic matter and nutrients (nitrogen, phosphorus) and total dissolved solid (TDS) at high concentration, And it is difficult to meet the legal discharge water quality standards because the treatment efficiency is low due to the low concentration of organic matter.

Therefore, it combines ozone oxidation process and separation membrane process to oxidize organic substances harmful to the human body and effectively controls membrane contaminants, thereby effectively separating and removing concentrated wastewater generated in the production process, It is necessary to develop a process that can meet water quality standards.

(Patent Document 1) Korean Patent Publication No. 10-1730978

(Patent Document 2) Korean Patent Publication No. 10-1360020

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an ozone- And to provide a water treatment apparatus and method using ozone, a separation membrane, and biofiltration.

Also, the present invention relates to a method for controlling ozone injection by controlling ozone injection amount by measuring water quality items in real time with respect to variation in raw water load, thereby preventing excessive injection, minimizing power consumption, Another purpose is to provide a water treatment apparatus and method using biofiltration.

In addition, the present invention improves the biological treatment efficiency by changing the characteristics of the degradable organic material due to the ozone oxidation effect, and by applying the granular activated sludge to treat the target material in a single biological filtration tank, The present invention also provides a water treatment apparatus and method using ozone, separation membrane, and biofiltration for water reuse and separation membrane concentrated water treatment.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided an air conditioning system comprising: a raw water tank storing raw water; An ozone generator for generating ozone; An ozone reaction tank receiving raw water of the raw water tank through a raw water supply pump and injecting ozone generated from the ozone generator and reacting; An ozone treatment water tank for receiving ozone treatment water discharged from the ozone reaction tank; A pretreatment separation membrane that receives ozone treatment water from the ozone treatment water tank through a first inflow pump, processes the ozone treatment water, and discharges filtered water and concentrated water; A filtration water tank for receiving filtered water filtered from the pretreatment separation membrane; A main treatment separation membrane for receiving and treating filtered water from the filtration water tank through a second inflow pump to discharge water and concentrated water, respectively; A concentrated water tank which is supplied with concentrated water discharged from the main treatment separation membrane and injects ozone discharged from the ozone reaction tank and reacts; And concentrated water discharged from the concentrated water supply pump is supplied and reacted with the biofiltration and organic carbon source, and the ozone discharged from the ozone reaction tank is injected and reacted together, and then the concentrated water is discharged in accordance with the discharged water quality standard, A water treatment apparatus to which a total ozone treatment including a filtration tank is applied is provided.

Preferably, the water quality measuring unit measures water quality of the raw water in real time and transmits the water quality measurement value. And a controller for controlling the amount of ozone generated by controlling the output value of the ozone generator according to the water quality measured by the water quality measuring unit.

The server may further include a server for receiving the measured water quality value and the output value in real time and collecting data.

Also, the ozone of the ozone reaction tank may be injected into at least one of the concentrating water tank, the biological filtration tank, or an injection pipe to be introduced into the biological filtration tank through a concentrated water supply pump.

In another embodiment of the present invention, in the water treatment method using the water treatment apparatus using the pre-ozone treatment, when the raw water of the raw water tank is supplied to the ozone reaction tank through the raw water supply pump, ozone generated in the ozonizer is supplied and reacted An ozone treatment step of storing ozone treatment water in an ozone treatment water tank; A pretreatment separation membrane process for treating ozone-treated water in the ozone-treated water tank with a pretreatment separation membrane to store filtered water in a filtered water tank and discharging the concentrated water; A main treatment separation membrane process for treating the filtered water of the filtering water tank with the main treatment membrane to store the concentrated water in the concentrated water tank and injecting and reacting the concentrated water and the ozone discharged from the ozone reaction tank to discharge the water; And a biological concentrated water treatment step of storing the concentrated water of the concentrated water tank in a biofilter, reacting the concentrated water with biofiltration and organic carbon source to meet the discharged water quality standard, and discharging the concentrated water. A water treatment method can be provided.

Preferably, in the pre-ozone treatment step, the water quality of the raw water in the raw water tank is measured in real time by the water quality measuring unit, and the control unit controls the output value of the ozone generator through the water quality measurement value to control the amount of ozone generated can do.

Preferably, the biological concentrate water treatment step is a step of increasing the efficiency of the concentrated water treatment when the concentrated water in the concentrated water tank is supplied to the biological filtration tank through the concentrated water supply pump, And ozone is injected.

According to the embodiment, by applying the entire ozone treatment process, membrane fouling can be reduced, and at the same time, the permeation performance can be improved and more raw water can be treated.

In addition, according to the present invention, the output value of the ozone generator can be controlled in real time according to the amount of raw water to minimize the amount of power consumption, to prolong the lifetime of the membrane due to frequent recovery washing prevention, to minimize the amount of secondary treatment to the cleaning waste solution, .

In addition, according to the present invention, the biological treatment efficiency of the granular activated sludge can be improved so that the characteristics of the refractory organic material are changed due to the ozone oxidizing effect to satisfy the discharged water quality standards.

The various and advantageous advantages and effects of the present invention are not limited to the above description, and can be more easily understood in the course of describing a specific embodiment of the present invention.

1 is a block diagram of a water treatment apparatus to which ozone treatment according to an embodiment of the present invention is applied,
FIG. 2 is a view showing a process of controlling the amount of ozone generated in the control unit, which is a component of FIG. 1,
FIG. 3 is a process diagram for explaining a water treatment method applying a pre-AM treatment according to another embodiment of the present invention,
4 is a graph showing changes in transmembrane pressure (TMP) of the pretreatment separation membrane due to ozone oxidation effect according to the present invention,
5 is a graph showing the COD _Mn removal efficiency of the granular activated sludge due to the ozone oxidation effect according to the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the embodiments of the present invention are not intended to be limited to the specific embodiments but include all modifications, equivalents, and alternatives falling within the spirit and scope of the embodiments.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the embodiments, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the description of the embodiments, in the case where one element is described as being formed "on or under" another element, the upper (upper) or lower (lower) or under are all such that two elements are in direct contact with each other or one or more other elements are indirectly formed between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

It will be apparent to those skilled in the art from this disclosure that the present invention is not limited to the embodiments illustrated in the drawings, It does not need to be.

FIG. 1 is a block diagram of a water treatment apparatus to which a total ozone treatment according to an embodiment of the present invention is applied, and FIG. 2 is a view illustrating a process of controlling the amount of ozone generated in a control unit that is a component of the present invention.

1 and 2, a water treatment apparatus 1 to which ozone treatment according to the present invention is applied includes a raw water tank T1, an ozone generator 10, an ozone reaction tank T2, T3, a pretreatment separation membrane 20, a filtration water tank T4, a main treatment separation membrane 30, a concentrated water tank T5, a biological filtration tank T6, a water quality measurement unit 40, and a control unit 50 ).

First, in the raw water tank (T1), raw water to be treated such as wastewater is stored.

Then, the ozone generator 10 controls the output value under the control of the control unit 50 to adjust the amount of generated ozone, and supplies the generated ozone to the ozone reaction tank T2.

The ozone reaction tank T2 is supplied with the raw water of the raw water tank T1 through the raw water supply pump P1 and the ozone generated by the ozone generator 10 is injected into the center of the bottom surface, And the ozone-treated water after completion of the reaction is overflowed and discharged

At this time, the ozone discharged from the ozone reaction tank T2 is supplied to the concentrated water tank T5 and the biological filtration tank T6 for recycling, and the concentrated water of the concentrated water tank T5 is supplied to the biological When it is supplied to the filtration tank T6, it is injected into the pipe.

Then, the ozone treatment water tank T3 receives and stores the ozone treatment water discharged from the ozone reaction tank T2. At this time, the ozone treatment water tank T3 is installed at a lower position so as to store ozone treatment water overflowed from the upper part of the ozone reaction tank T2.

Subsequently, the pretreatment separation membrane 20 receives the ozone-treated water from the ozone treatment tank T3 through the first inflow pump P2 and performs filtration treatment to discharge the filtered water and the concentrated water.

It is preferable that the pretreatment separation membrane 20 is applied with a microfiltration MF or an ultrafiltration UF and the filtration is performed through a reverse cleaning pump P3 and a compressor C Periodically backwashing is performed using filtered water in the water tank T4. At this time, the concentrated water and the backwash water are discharged to the outside.

On the other hand, the filtration water T4 is supplied to the upper portion of the filtered water filtered from the pretreatment separation membrane 20, and is discharged to the lower portion.

The main treatment separation membrane 30 receives filtrate water from the filtration water tank T4 through the second inflow pump P4 and performs filtration treatment to discharge the water and concentrated water. At this time, it is preferable that a nanofiltration (NF) or a reverse osmosis (RO) is applied to the main treatment separator 30, and the water is discharged to the outside.

In the concentrated water tank T5, the concentrated water discharged from the main treatment separation membrane 30 is supplied to the upper part, the ozone discharged from the ozone reaction tank T2 is injected into the central part of the bottom surface and reacted, do.

The biological filtration tank T6 receives the concentrated water discharged from the concentrated water supply pump P5 and reacts with the biofiltration and the organic carbon source. The ozone discharged from the ozone tank T2 is injected and reacted together, The water is discharged according to the discharged water quality standard.

Referring to FIG. 2, the water quality measurement unit 40 measures water quality of raw water in real time and transmits a water quality measurement value. At this time, turbidity, chromaticity, TOC, DOC, COD, UV254 and the like are measured as water quality factors.

In one embodiment, the control unit 50 controls the output value of the ozone generator 10 according to the measured water quality measured by the water quality measurement unit 40 to control the amount of ozone generated.

The control unit 50 sets the respective set values (or concentrations) of turbidity, chromaticity, TOC, DOC, COD and UV254 as the water quality factors measured by the water quality measuring unit 40, The amount of ozone generated in the range is determined.

For example, referring to FIG. 2, when the measured value of one water quality factor measured in the incoming raw water falls within the range of the set value 2 and the set value 3, the ozone injection amount may be determined as the output value 2. The amount of ozone injected can be determined at each water quality factor, and the controller 50 compares the measured ozone injection amount at each water quality factor and determines the highest amount of ozone injected.

The amount of ozone injected for each water quality factor can vary depending on the user's setting.

In another embodiment, the control unit 50 continuously measures the water quality in the water quality measuring unit 40 when the raw water is introduced. At this time, when the water quality standard of the raw water is changed compared to the raw water that has conventionally been introduced, the amount of ozone injected can be determined using a sample test.

In the sample test, samples are taken to determine the amount of ozone to be injected, and then ozone is injected. Then, the control unit may determine the ozone injection amount at which the desired removal rate is generated by measuring the removal rate according to the ozone injection amount and changing the ozone injection amount.

If the amount of ozone injected is excessive, there is a problem that the power is excessively consumed, so that the cost of water treatment can be reduced and efficiency can be increased by determining the optimal range of ozone injection amount.

The water treatment apparatus 1 using ozone, separation membrane, and biofiltration for water reuse and separation membrane concentrated water treatment according to the present invention comprises an oxidant storage tank (not shown) for supplying an oxidant to the ozone tank T2 through an oxidant injection pump P6, An organic carbon source chemical tank T8 for supplying an organic carbon source to the biological filtration tank T6 through a chemical injection pump P7 and a server 60 for collecting data by receiving water quality measurement values and output values in real time, . As the oxidizing agent, a chlorine-based system such as hypochlorite (HOCl) and an oxygen system such as hydrogen peroxide (H2O2) are used. As the organic carbon source, sodium acetate (C2H3NaO2), methanol (CH3OH) and the like are used.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a water treatment method applied with ozone treatment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a process diagram for explaining a water treatment method applying a pre-AM treatment according to another embodiment of the present invention.

Referring to FIG. 3, the water treatment method applying the pre-AM treatment according to another embodiment of the present invention includes a total ozone treatment process S10, a pre-treatment separation membrane process S20, a main treatment membrane process S30, And a processing step (S40).

"All Ozone Treatment Process-S10"

First, the raw water in the raw water tank T1 is supplied to the lower part of the ozone reaction tank T2 through the raw water supply pump P1, and the ozone generated in the ozone generator 10 is supplied to the center of the bottom surface of the ozone reaction tank T2 After the ozone is raised, the ozone-treated water that overflows in the reaction is stored in the ozone-treated water tank T3.

The control unit 50 controls the output value of the ozone generator 10 according to the measured water quality measured by the water quality measurement unit 40 to control the amount of generated ozone.

Further, the oxidizing agent stored in the oxidizing agent storage tank T7 is supplied to the ozone reaction tank T2 via the oxidant injection pump P6 to increase the ozone oxidation effect.

&Quot; Pretreatment separation membrane process-S20 "

Then, when ozone-treated water stored in the ozone treatment tank T3 is supplied to the pretreatment separation membrane 20 through the first inflow pump P2, the ozone-treated water is filtered by the pretreatment separation membrane 20 and the filtered water is supplied to the filtration water tank T4. And discharges the concentrated water.

At this time, in order to control film contamination of the pretreatment separation membrane 20, the backwashing is periodically performed using filtered water of the filtration water tank T4 through the backwash pump P3 and the compressor C.

&Quot; Main process separation membrane process-S30 "

Subsequently, when the filtered water in the filtration tank T4 is supplied to the main treatment separation membrane 30 through the second inflow pump P4, the filtered water is filtered in the main treatment separation membrane 30 to discharge the water and the concentrated water, respectively, And the water is stored in the concentrated water tank T5.

The concentrated water stored in the concentrated water tank T5 is discharged from the ozone reaction tank T2 and reacted with the ozone injected into the central portion of the bottom of the concentrated water tank T5 and the pipe through which the concentrated water flows, To the biological filtration tank T6.

At this time, it is preferable that the ozone discharged from the ozone reaction tank T2 is simultaneously injected into the biological filtration tank T6 through the concentrated water feed pump P5 of the concentrated water tank T5 to maximize the treatment efficiency .

"Biologically Concentrated Water Treatment Process-S40"

Then, the concentrated water flowing into the biological filtration tank (T6) injects the ozone discharged from the ozone reaction tank (T2) into the central portion of the bottom surface of the biological filtration tank (T6) And then discharged. At this time, the organic carbon source stored in the organic carbon source chemical tank T8 is supplied to the biological filtration tank T6 through the chemical injection pump P7.

&Quot; Experimental Example &

According to the water treatment method applied with the pre-AM treatment according to the present invention, the following experiment was conducted.

4 is a graph showing changes in transmembrane pressure (TMP) of the pretreatment separation membrane due to ozone oxidation effect according to the present invention.

Comparing the permeation performance of the pretreatment membrane due to the ozone oxidation effect, the TMP rise of the membrane process with or without ozone injection as an operation example according to the present invention was shown.

In order to compare membrane contamination rates, filtration and backwashing cycles were 29.5 min and 0.5 min, respectively. Periodically backwashing was 29.2 kPa / hr without ozone, while 1.7 kPa / hr, and the ozone oxidation effect has an effect on membrane fouling reduction.

5 is a graph showing COD _Mn removal efficiency of biofiltration due to ozone oxidation effect according to the present invention.

Comparing the organic matter removal efficiency of the granular sludge due to the ozone oxidation effect, the efficiency of removal of organic matter (COD _Mn ) in the concentrated water according to the operation example according to the present invention was shown.

As a result of comparing the removal efficiencies of organic matter (COD _Mn ) in concentrated water 6 times, the removal efficiency was about 9.7% on average without ozone application, but about 55.9% after ozone application It was found that the efficiency of organic matter removal was increased due to the ozone oxidation effect.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: ozone generator 20: pretreatment membrane
30: main treatment separation membrane 40: water quality measurement unit
50: control unit 60: server
T1: Circulating water tank
T2: ozone reaction tank T3: ozone treatment water tank
T4: Filtration tank T5: Condensate tank
T6: Biological filtration tank

Claims (7)

A raw water tank in which raw water is stored;
An ozone generator for generating ozone;
An ozone reaction tank receiving raw water of the raw water tank through a raw water supply pump and injecting ozone generated from the ozone generator and reacting;
An ozone treatment water tank for receiving ozone treatment water discharged from the ozone reaction tank;
A pretreatment separation membrane that receives ozone treatment water from the ozone treatment water tank through a first inflow pump, processes the ozone treatment water, and discharges filtered water and concentrated water;
A filtration water tank for receiving filtered water filtered from the pretreatment separation membrane;
A main treatment separation membrane for receiving and treating filtered water from the filtration water tank through a second inflow pump to discharge water and concentrated water, respectively;
A concentrated water tank which is supplied with concentrated water discharged from the main treatment separation membrane and injects ozone discharged from the ozone reaction tank and reacts; And
The concentrated water discharged from the concentrated water supply pump is supplied and reacted with the biofiltration and the organic carbon source, the ozone discharged from the ozone reaction tank is injected and reacted together, the concentrated water is discharged according to the discharged water quality standard, ;
A water treatment apparatus to which a total ozone treatment is applied. The method according to claim 1,
A water quality measuring unit for measuring water quality of raw water in real time and transmitting the water quality measurement value; And
A controller for controlling an ozone generation amount by controlling an output value of the ozone generator according to a measured water quality value measured by the water quality measurement unit;
Wherein the ozone treatment is applied to the water treatment apparatus. 3. The method of claim 2,
A server for collecting data by receiving the water quality measurement value and the output value in real time;
Further comprising an ozone treatment unit for treating the ozone water. The method according to claim 1,
The ozone of the ozone reaction tank may include,
Wherein the concentrated water, the biofilter, or the concentrated water is injected into at least one of the injection pipes injected into the biological filtration tank through the concentrated water supply pump. A water treatment method using a water treatment apparatus applying the ozone treatment according to any one of claims 1 to 4,
A total ozone treatment step of supplying ozone generated in the ozone generator when the raw water of the raw water tank is supplied to the ozone reaction tank through the raw water supply pump and then reacting and storing the ozone water in the ozonated water tank;
A pretreatment separation membrane process for treating ozone-treated water in the ozone-treated water tank with a pretreatment separation membrane to store filtered water in a filtered water tank and discharging the concentrated water;
A main treatment separation membrane process for treating the filtered water of the filtering water tank with the main treatment membrane to store the concentrated water in the concentrated water tank and injecting and reacting the concentrated water and the ozone discharged from the ozone reaction tank to discharge the water; And
Characterized in that the concentrated water in the concentrated water tank is stored in a biological filtration tank and reacted with biofiltration and organic carbon source to satisfy the discharged water quality standard and then discharged. Method. 6. The method of claim 5,
In the pre-ozone treatment step,
Wherein the water quality of the raw water of the raw water tank is measured in real time by the water quality measuring unit and the output value of the ozone generator is controlled through the water quality measurement value by the control unit to control the amount of generated ozone. 6. The method of claim 5,
The biological concentrate water treatment process comprises:
Wherein the ozonized water in the ozonization tank is injected so as to meet the standard of discharged water quality by increasing the efficiency of the concentrated water treatment when the concentrated water in the concentrated water tank is supplied to the biological filtration tank through the concentrated water supply pump. Applied water treatment method.

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