KR20110046589A - System and method purifying water using biological activated carbon and granular activated carbon - Google Patents

Abstract

PURPOSE: A water purification system and a water purification method using thereof are provided to remove harmful dissolved organic materials and microorganisms from water without removing minerals. CONSTITUTION: A water purification system(1) comprises the following: a biological water purifying unit(20) including a biological activated carbon processing unit(200) for digest-decomposing and removing organic compounds inside water using microorganisms; a physical-chemical adsorption water purifying unit(30) including a granular activated carbon processing unit(300) for removing the organic compounds inside the water using granular activated carbon with pores; an ozone injection unit(100) injecting ozone into the water; and an ozone reservoir(110) removing the ozone, and volatile organic compounds from the water.

Description

System and method purifying water using biological activated carbon and granular activated carbon}

The present invention relates to a water purification system and a water purification method, and more particularly, to a water purification system and a water purification method using biological activated carbon and granular activated carbon.

Even if water is purified and supplied to a drinking water treatment plant, a lot of people's disbelief about the safety of tap water pollution has increased greatly due to the increase in the pollution concentration of raw water and the pollution concentration of raw water, especially organic matter. Recently, with increasing interest in clean drinking water and distrust in tap water, there is an increasing tendency to drink purified water using a water purifier instead of drinking tap water directly. Although there are several types of water purifiers, the water purifier may be classified into a hollow fiber membrane method and a reverse osmosis method, which are largely assembled with granular activated carbon layers. Reverse osmosis water purifier is excellent in the removal of contaminants, such as dissolved organic contaminants in water, but the purified water is almost the level of distilled water has a limit to remove the minerals beneficial to the human body. Hollow fiber membrane type water purifier is generally assembled with granular activated carbon layer. This method is insufficient to remove dissolved organic contaminants in water and functions as a water purifier in which microorganisms propagate in contaminated filter when filter management is poor. There is a risk of losing.

The technical problem to be achieved by the present invention is to provide a water purification system capable of removing dissolved organic matter and microorganisms harmful to the human body without removing the mineral component beneficial to the human body.

In addition, another technical problem to be achieved by the present invention is to provide a water purification method capable of removing dissolved organic matter and microorganisms harmful to the human body without removing the mineral component beneficial to the human body.

Purification system according to the present invention for achieving the above technical problem, the biologically activated carbon treatment unit, by using the microorganisms contained in the biological activated carbon treatment unit by ingesting and removing dissolved organic matter in the water, the first water purification treatment Biological purified water treatment unit; And granular activated carbon treatment unit, and absorbing and removing the organic matter dissolved in the water by using granular activated carbon included in the granular activated carbon treatment unit and including porous pores, thereby removing the water firstly purified by the biological water treatment unit. It includes; physical and chemical adsorption water purification treatment unit for the second purification.

In addition, the water purification method according to the present invention for achieving the above another technical problem, the step of injecting ozone into the water introduced into the ozone injection unit; Removing dissolved ozone, volatile organics, or both injected into the water introduced into the ozone reservoir; Firstly purifying the water introduced into the biological activated carbon treatment unit by decomposing and removing the organic matter dissolved in the water using microorganisms included in the biological activated carbon treatment unit; Performing secondary water purification by further removing the water introduced into the granular activated carbon treatment unit by adsorbing the dissolved organic substance in the water by using the granular activated carbon included in the granular activated carbon treatment unit; And disinfecting the water introduced into the disinfection unit. It includes.

The water purification system and the water purification method of the present invention can remove dissolved organic matter and microorganisms harmful to the human body without removing the mineral component beneficial to the human body. In addition, the physical and chemical adsorption properties of granular activated carbon are obtained from primary purified water using bio-activated carbon that decomposes organic substances that are readily available for feeding microorganisms in water-dissolved organic substances, and degradable organic substances that are easily adsorbed by degradable organic substances. Since water is purified by sequentially performing the second purified water used, various kinds of organic substances that are difficult to remove can be easily removed using only granular activated carbon which is commonly used in homes, thereby improving water quality and It can extend the life of activated carbon.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to the Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

1 is a schematic diagram illustrating a water purification system 1 according to some embodiments of the present invention. Referring to FIG. 1, the water purification system 1 includes a pretreatment unit 10, a biological water treatment unit 20, a physical chemical adsorption water treatment unit 30, and a post-treatment unit 40. Water introduced into the water purification system 1 is purified by passing through the pretreatment unit 10, the biological water purification unit 20, and the physical chemical adsorption water purification unit 30 sequentially. In addition, the water may be disinfected in the aftertreatment unit 40 after the water treatment in the physical chemical adsorption purified water treatment unit 30.

The pretreatment unit 10 includes an ozone injection unit 100 and an ozone storage unit 110. The ozone injector 100 may further include an ozone generator (not shown) that generates ozone, and injects the ozone into the inflowed water to decompose the hardly decomposable organic matter in the dissolved organic matter by the microorganism. Degradable organics can change. The ozone reservoir 110 may include a heating device and a stirring device. The ozone reservoir 110 removes volatile organic carbon (VOC), for example, THM (trihalomethane, trihalomethane), which is a water disinfection by-product from the dissolved ozone and the dissolved organic matter. In addition, by maintaining the water at an appropriately warmed temperature to increase the activity of the microorganisms in the biological water treatment unit 20, which is a subsequent process.

The biological purified water treatment unit 20 firstly treats the introduced water by biological purified water treatment. The biological purified water treatment unit 20 includes a biological activated carbon treatment unit 200. Here, the biological purified water treatment means treating the water introduced by ingesting and decomposing organic substances dissolved in water using microorganisms grown and inhabited on the surface of the biological activated carbon included in the biological activated carbon processing unit 200. The biological activated carbon processing unit 200 may include a biological activated carbon (BAC) including microorganisms such as bacteria that can decompose the dissolved organic matter in the water. The biologically activated carbon may have a structure filled with granular activated carbon including carbon and porous pores of various sizes. Porous pores contained in the granular activated carbon are composed of numerous pores with an area of about 1000 m ² per 1g. The microorganism may inhabit the surface of the activated carbon having the porous pores. The microorganisms ingest and decompose the degradable organic substances adsorbed in the porous pores on the principle of concentration diffusion by the concentration gradient in the pores. Subsequently, when organic matter is adsorbed again into the empty pores, the microorganisms reacquire and decompose the adsorbed organic matter on the principle of concentration diffusion as described above. By repeating this process, the degradable organic material is removed from the biological activated carbon processing unit 200. The microorganism may include bacteria, fungi, protozoa, and welfare animals, and may include all microorganisms capable of decomposing organic substances dissolved in water.

The physical chemical adsorption water treatment unit 30 performs the second water purification process on the water subjected to the primary water treatment by the biological water treatment unit 20 by physical chemical adsorption water treatment. Here, the physical chemical adsorption water treatment means that the water dissolved in the pores of the porous activated carbon is adsorbed by the organic and physical adsorption and chemical adsorption methods, rather than biologically. Physical adsorption means adsorption without changing the material of the organic matter, and chemical adsorption means adsorption accompanied with chemical changes caused by the reaction of the organic material with various functional groups on the surface of the activated carbon in the pores. Physical adsorption and chemical adsorption of the organics may occur separately or together.

The physical chemical adsorption purified water treatment unit 30 includes a granular activated carbon treatment unit 300. The granular activated carbon processing unit 300 may have a structure filled with granular activated carbon (GAC) including carbon and having pores of various sizes. The granular activated carbon may further remove organic dissolved in water remaining in the water without being decomposed in the biological activated carbon processing unit 200. For example, the organic material may be adsorbed and removed by pores included in the granular activated carbon. The granular activated carbon included in the granular activated carbon processing unit 300 may be the same material or different materials as the granular activated carbon included in the biological activated carbon processing unit 200, and may have the same inner circumferential structure such as pore size, distribution, and arrangement. Or they may be different.

The aftertreatment unit 40 disinfects the water purified by the biological purified water treatment unit 20 and the physical chemical adsorption purified water treatment unit 30. The aftertreatment unit 40 may include a disinfection unit 400, and the disinfection unit 400 may include an ozone generator (not shown) or an ultraviolet generator (not shown). The water may be disinfected by ozone generated by the ozone generator or ultraviolet rays generated by the ultraviolet generator, and in particular, may kill microorganisms transferred from the biological purified water treatment unit 20.

2 is a flowchart showing a water purification method using the water purification system 1 of FIG. Referring to FIG. 2, water introduced into the water purification system 1 of FIG. 1 may be purified through the following steps.

Generally, water is a deodorant such as Natural Organic Matter, Geosmin or 2-Methyl isoborneol (2-MIB), or detergents, phenols, pesticides, or disinfection by-products. Organic materials such as various artificial organic materials such as and the like. These organics may be present as dissolved organic carbon (hereinafter referred to as DOC) in water. In addition, the DOC may be classified into an organic material decomposed by a microorganism (Biodegradable Dissolved Organic Carbon, hereinafter referred to as BDOC) and an organic material decomposable by a microorganism (Non-Biodegradable Dissolved Organic Carbon, hereinafter referred to as NBDOC).

First, water flows into the pretreatment section 10 of the water purification system 1 from the outside. Herein, the water may be raw water supplied from a water source, but the present invention is not limited thereto. In addition, before the water of the pretreatment unit 10 is selectively introduced, impurities of the water may be aggregated and precipitated by performing a conventional agglomeration and precipitation process to remove the water from the water first. The water introduced into the pretreatment unit 10 sequentially passes through the ozone injection unit 100 and the ozone storage unit 110.

In the ozone injection unit 100, ozone (O ₃ ) is injected into the introduced water (S10). The ozone may be generated from a conventional ozone generator (not shown), and the ozone generator may generate ozone through electric discharge by sucking air or oxygen gas therein. Since the ozone is a strong oxidant, the organic matter dissolved in the water may be oxidized to facilitate the decomposition of the organic material by the microorganisms included in the biological activated carbon processing unit 200, and in particular, the NBDOC does not decompose by the microorganism. Can be transformed into BDOC which can be degraded by microorganisms. In addition, ozone can supply oxygen necessary for the metabolism of microorganisms, thereby increasing the activity of the microorganisms. Subsequently, the water injected with the ozone from the ozone injector 100 flows into the ozone reservoir 110.

Subsequently, the ozone and the volatile organic substances dissolved in the water are injected into the water introduced into the ozone storage unit 110 (S20). In addition, the ozone reservoir 110 is a heating device (not shown) for maintaining the water at an appropriate temperature, a temperature in the range of about 20 ℃ to about 40 ℃, preferably in the range of about 25 ℃ to about 35 ℃ And it may further include a stirring device (not shown) for stirring the water. As described above, since ozone is a strong oxidizing agent, if the concentration remaining in water is too high, it may kill or reduce the activity of microorganisms inhabiting the biological activated carbon in a subsequent biological activated carbon treatment process. Thus, the ozone and volatile organics remaining in the water need to be removed or adjusted as appropriate concentration and temperature. Therefore, when the water is treated by the ozone reservoir 110, the activity of the microorganisms can be increased in the subsequent biological activated carbon treatment process. The ozone reservoir 110 stores the water without flow, or generates a flow in the water by using a stirring device including a rotating member such as a screw to remove the ozone and the volatile organics from the water. May be removed or the desired concentration and temperature may be maintained. The time for which the water is treated in the ozone reservoir 110 may be, for example, in a range of about 30 minutes to about 60 minutes. Part of the ozone removed may be converted to oxygen to increase the amount of dissolved oxygen in the water, in which case the activity of the microorganism may be rather increased. Subsequently, the water from which the ozone is removed from the ozone reservoir 110 flows into the biological activated carbon treatment unit 200.

Subsequently, the water introduced into the biological activated carbon processing unit 200 is subjected to the first purified water using the microorganisms included in the biological activated carbon processing unit 200 (S30). The dissolved organic matter in the water, for example, BDOC, which is easily ingested and decomposed by the microorganism in the BDOC, may be ingested and decomposed by the microorganism. Empty bed contact time (EBCT) in which the water is processed in the biological activated carbon treatment unit 200 may be, for example, about 10 minutes to about 20 minutes, for example about 15 minutes (± 2 minutes) have. It is preferable that the total amount of the BDOC is degraded by the microorganism, but some BDOCs may not be degraded. In addition, when the microorganism reaches the end of its life, it may accumulate in the granular activated carbon included in the biological activated carbon processing unit 200, thereby reducing the porosity of the granular activated carbon, thereby reducing the water purification efficiency of the water. . In order to prevent this, the biological activated carbon processing unit 200 may further include a backwash device (not shown). The backwashing apparatus can remove microorganisms accumulated in the granular activated carbon at the end of their lifespan by forcibly flowing water in the reverse direction with respect to the water treatment direction described above. Accordingly, young microorganisms having good activity can be included in the granular activated carbon, thereby maintaining or increasing water treatment efficiency. Subsequently, the first water purified by the biological activated carbon treatment unit 200 flows into the physical chemical adsorption purified water treatment unit 30.

Subsequently, the water introduced into the physical chemical adsorption water treatment unit 30, for example, the granular activated carbon processing unit 300, is subjected to secondary water purification using granular activated carbon included in the granular activated carbon processing unit 300 (S40). The granular activated carbon may be further removed by adsorbing the dissolved organic matter in the water to pores contained therein, and the dissolved organic matter in the water may be BDOC or NBDOC remaining without being degraded by the microorganism. The tower stay time (EBCT) of the water treated in the granular activated carbon treatment unit 300 may be, for example, about 5 minutes to about 15 minutes, for example, about 10 minutes (± 2 minutes). In addition, as the water purification treatment is performed, solid particles may accumulate as the microorganisms are introduced from the granular activated carbon included in the granular activated carbon processing unit 300 from the particulate matter or the biological activated carbon processing unit 200. Porosity of the granular activated carbon may be reduced, which may reduce the water treatment efficiency of the water. In order to prevent this, the granular activated carbon processing unit 300 may further include a backwashing device (not shown). The backwashing apparatus can remove impurities accumulated in the granular activated carbon by forcing the water flow in the reverse direction with respect to the above-described water treatment direction. Accordingly, by increasing the number of pores capable of adsorbing the granular activated carbon, it is possible to maintain or increase the water treatment efficiency. Subsequently, the second purified water in the granular activated carbon treatment unit 300 may flow out. The water flowing out from the physical chemical adsorption purified water treatment unit 30 preferably has a DOC concentration of 0.2 ppm or less. However, when the concentration of the water is 0.2 ppm or more, or when the microorganisms may remain in the water, the water may flow into the aftertreatment unit 40.

After the treatment unit 40, for example, disinfecting the water introduced into the disinfection unit 400 (S50). This step can be omitted. The disinfecting unit 400 performs disinfection treatment such as killing microorganisms remaining in the water by ozone or ultraviolet rays. Subsequently, the water sterilized by the aftertreatment unit 40 flows out. The water flowing out from the aftertreatment unit 40 preferably has a DOC concentration of 0.2 ppm or less.

FIG. 3 is a schematic diagram showing the water purification device 1a implementing the water purification system 1 of FIG. 1. Referring to FIG. 3, the water purification device 1a includes an ozone injection tower 100a, an ozone storage tower 110a, a biological activated carbon treatment tower 200a, and a granular activated carbon treatment tower 300a sequentially connected by a water supply pipe 120a. ), And a disinfection tower 400a. The ozone injection tower 100a, the ozone storage tower 110a, the biological activated carbon treatment tower 200a, the granular activated carbon treatment tower 300a, and the disinfection tower 400a are respectively the ozone injection unit 100 and ozone storage of FIG. The unit 110, the biological activated carbon processing unit 200, the granular activated carbon processing unit 300, and the disinfection unit 400 may be respectively performed.

Water to be purified is first introduced into the ozone injection tower (100a). In the ozone injection tower 100a, ozone generated by the ozone generator 102a is injected into the introduced water. The ozone may react with the organics dissolved in the water and, for example, convert NBDOCs dissolved in the water into BDOCs. In addition, the ozone may be dissolved in the water. The waste gas generated by the reaction with the ozone or the organic material not dissolved in the water may be discharged to the outside through the first exhaust part 104a installed in the ozone injection tower 100a as indicated by the dotted arrow.

Subsequently, the water flows into the ozone storage tower 110a through a water supply pipe 120a and removes the ozone and volatile organic substances dissolved in the water. The ozone storage tower 110a may further include a heating device 114a for maintaining the water at an appropriate temperature and a stirring device 116a for stirring the water. It is to be understood that the screw-shaped stirring portion in the illustrated stirring device 116a is exemplary, and the present invention is not limited thereto, and all devices capable of stirring the water are possible. Accordingly, the water can be maintained at an appropriate temperature to increase the activity of the microorganisms in the subsequent biological activated carbon treatment process. The temperature of the water maintained in the ozone storage tower 110a using the heating device 114a may be, for example, in the range of about 20 ° C to about 40 ° C, or in the range of about 25 ° C to about 35 ° C, for example. have. The time for which the water is treated in the ozone storage tower 110a may be, for example, in a range of about 30 minutes to about 60 minutes. The ozone dissolved in the water may be converted into oxygen or discharged to the outside as waste gas, and the waste gas is indicated by a dotted arrow through the second exhaust 112a installed in the ozone storage tower 110a. It can be released to the outside.

Subsequently, the water maintained in the range of about 20 ° C. to about 40 ° C., for example, or in the range of about 25 ° C. to about 35 ° C., as the ozone storage tower 110a may be used to supply the water supply pipe 120a. Through the biological activated carbon treatment tower 200a. The biological activated carbon treatment tower 200a is filled with biological activated carbon 210a. The biological activated carbon 210a may include, for example, granular activated carbon and microorganisms. The water passes along the water purification direction from the top of the biological treatment tower (200a) to the lower direction, thereby removing the BDOC dissolved in the water by the microorganism decomposes. In addition, the water is pressurized by a pump (not shown) or the like may change the water purification direction, for example, the upper direction may be the water purification direction. The tower stay time (EBCT) for which the water is treated in the biological activated carbon treatment tower 200a may be, for example, about 10 minutes to about 20 minutes, for example, about 15 minutes (± 2 minutes). In addition, as described above, the biological activated carbon treatment tower 200a may include a first backwashing device 220a that performs backwashing. The first backwashing device 220a supplies additional water to or pressurizes the biological activated carbon 210a to advance water to the biological activated carbon 210a in a reverse direction to the water treatment direction, thereby cleaning the biological activated carbon 210a. Backwashing can be performed. Wastewater generated by the backwashing is discharged to the outside through the first wastewater pipe 230a.

Subsequently, the water flows into the granular activated carbon treatment tower 300a through the water supply pipe 120a. The granular activated carbon treatment tower 300a is filled with granular activated carbon 310a. The water passes from the upper portion to the lower portion of the granular activated carbon treatment tower 300a along the water purification direction, thereby removing the organic matter dissolved in the water, for example, BDOC and NBDOC by adsorbing the granular activated carbon 310a. Can be. In addition, the water is pressurized by a pump (not shown) or the like may change the water purification direction, for example, the upper direction may be the water purification direction. The tower stay time (EBCT) for which the water is treated in the granular activated carbon treatment tower 300a may be, for example, about 5 minutes to about 15 minutes, for example, about 10 minutes (± 2 minutes). In addition, as described above, the granular activated carbon treatment tower 300a may include a second backwashing device 320a that performs backwashing. The second backwashing device 320a supplies additional water to or pressurizes the granular activated carbon 310a to advance water to the granular activated carbon 310a in the opposite direction to the water treatment direction, thereby cleaning the granular activated carbon 310a. Backwashing can be performed. Wastewater generated by the backwashing is discharged to the outside through the second wastewater pipe 330a.

Subsequently, the water flows into the disinfection tower 400a through the water supply pipe 120a. In the disinfection tower 400a, ozone generated by the ozone generator 410a is injected into the introduced water. The ozone generator 410a generates an ozone to perform disinfection treatment such as killing microorganisms remaining in the water. Waste gas generated from the ozone may be discharged to the outside through the second exhaust portion 420a installed in the disinfection tower 400a as indicated by the dotted arrow. Alternatively, the disinfection tower 400a may include an ultraviolet generator in place of the illustrated ozone generator 410a. In this case, the ultraviolet generator can generate ultraviolet rays to disinfect the water. Disinfection of the water by the disinfection tower 400a is optional. Subsequently, the purified water is discharged to the outside using the water supply pipe 120a.

Table 1 is an experimental result showing the water purification efficacy of the water purification device (1a) according to the present invention. Table 1 shows the DOC concentration of the water obtained immediately after performing the first purified water treatment using biological activated carbon using the water purification device 1a according to the present invention, and the first purified water treatment using biological activated carbon and the second purified water treatment using granular activated carbon. The DOC concentrations of water immediately after performing all are shown separately. In addition, as a comparative example, the DOC concentration of water immediately after performing water treatment using only granular activated carbon was shown. The data in Table 1 shows five or more individual water samples for each case, and the data obtained from 10 concentration analyzes for each sample are taken into account in terms of average and standard deviation.

Initial DOC Concentration of Tap Water (ppm) According to the invention, the DOC concentration (ppm) of water after performing the bioactive carbon treatment According to the present invention, the DOC concentration in water after the biological activated carbon treatment and granular activated carbon treatment (ppm) As a comparative example, the DOC concentration in water after only granular activated carbon treatment was performed (ppm) 1.3 to 1.4 0.7 to 0.9 0.15 to 0.22 0.28 to 0.35 1.7 to 1.8 1.0 to 1.2 0.2 to 0.35 0.4 to 0.5

Referring to Table 1, when the DOC concentration of the tap water is 1.3 ppm to 1.4 ppm, the DOC concentration after the bioactive carbon treatment is 0.7 ppm to 0.9 ppm, and then the DOC concentration after the granular activated carbon treatment is 0.15. ppm to 0.22. On the other hand, as a comparative example, the DOC concentration after performing granular activated carbon treatment was 0.28 ppm to 0.35 ppm. When the DOC concentration of the tap water is 1.7 ppm to 1.8 ppm, the DOC concentration after the bioactive carbon treatment is 1.0 ppm to 1.2 ppm, and the DOC concentration after the granular activated carbon treatment is 0.2 ppm to 0.35. Indicated. On the other hand, as a comparative example, the DOC concentration after performing granular activated carbon treatment was 0.4 ppm to 0.5 ppm.

According to Table 1, when water was purified using the water purifying apparatus 1a according to the present invention, a DOC concentration of 0.2 ppm suitable as drinking water was achieved. In addition, as the DOC concentration of the tap water increased, the DOC concentration of the purified water also increased. In addition, the bioactive carbon treatment and the granular activated carbon treatment were combined with the lower DOC concentration than the granular activated carbon treatment, and the same result was obtained for the DOC concentration of the other tap water. In addition, as described above, it was found that maintaining the water at an appropriate temperature and stirring the ozone reservoir 110a facilitates low DOC concentration. In addition, when the bioactive carbon treatment was first performed, the DOC concentration of the raw water could be reduced by 30 to 50%, which reduces the DOC concentration load to be removed by the granular activated carbon.

Granular activated carbon can have a lifespan of about 3 months to 6 months because the organic matter is adsorbed in the pores, the life is shortened as the DOC concentration increases. However, biologically activated carbon can have a long life of 10 years or more when properly controlled to microorganisms. Therefore, the purified water system according to the present invention is to reduce the DOC concentration by first treating the water using biological activated carbon in the biological activated carbon treatment unit, and then treated the water by using granular activated carbon in the granular activated carbon treatment unit, Can increase lifespan. Therefore, the water purification system according to the present invention can very effectively reduce the cost of granular activated carbon required per period. In addition, unlike the conventional reverse osmosis method, the water purification system according to the present invention does not remove the dissolved mineral components in the water, and thus can provide water containing minerals beneficial to the human body.

Table 2 shows the DOC concentration and DOC removal rate of the effluent from the ozone reservoir 110a and the effluent from the bioactive carbon treatment tower 200a at different temperatures by maintaining the water in the ozone reservoir 110a with stirring. The table compares DOC concentration and DOC removal rate. In this case, the DOC concentration of the fed raw water was 1.72 ppm.

Temperature 15 ℃ 30 ℃ DOC Concentration of Ozone Reservoir Effluent 1.62 ppm 1.36 ppm DOC removal rate of ozone storage tower 5.8% 21% DOC Concentration of Biological Activated Carbon Treatment Tower Effluent 1.38 ppm 1.05 ppm DOC removal rate of biological activated carbon treatment tower 14.8% 22.8% DOC Removal Rate of Raw Water Based Biological Activated Carbon Treatment Tower 20% 39%

Referring to Table 2, when the temperature of the ozone storage tower 110a is maintained at 30 ° C, the DOC removal rate of the raw water-based biological activated carbon treatment tower 200a was about 2 times higher than that at 15 ° C. In addition, when the temperature of the ozone storage tower 110a is maintained at 25 ° C to 35 ° C, the DOC removal rate of the raw water reference biological activated carbon treatment tower 200a was 21% to 39%, and the temperature of the ozone storage tower 110a was increased. When it is maintained at 12 ° C to 18 ° C, the DOC removal rate of the raw water-based biological activated carbon treatment tower 200a was 6% to 20%. Therefore, it was found that maintaining the temperature of the ozone storage tower 110a at 25 ° C to 35 ° C is more efficient for DOC removal. Considering the above results, it is preferable to maintain the temperature of the ozone storage tower (110a) in the range of 25 ℃ to 35 ℃, especially in the season when the temperature of the water, such as winter, should pay attention to the water temperature maintenance. On the other hand, if the temperature of the water is higher than 40 ℃, there is a fear that the activity of the microorganisms is suppressed or killed.

In addition, the ozone storage tower 110a may stir the water using the stirring device 116a to uniformly distribute the water temperature of the water. This agitation of water can easily remove volatile organics dissolved in water, such as harmful ozone and residual ozone, such as THM, which is a disinfection byproduct of tap water. In addition, the uniform water temperature by the stirring of the water allows the microorganisms to effectively operate in the biological activated carbon treatment tower 200a, and consequently increases the removal efficiency of the DOC.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

1 is a schematic diagram illustrating a water purification system according to some embodiments of the present invention.

FIG. 2 is a flowchart illustrating a water purification method using the water purification system of FIG. 1.

FIG. 3 is a schematic diagram illustrating a water purification device implementing the water purification system of FIG. 1.

Claims (7)

A biological purified water treatment unit including a biological activated carbon treatment unit and performing primary water treatment on water by ingesting and removing the organic matter dissolved in water using microorganisms included in the biological activated carbon treatment unit; And It includes a granular activated carbon treatment unit, by adsorbing and removing the dissolved organic matter in the water by using the granular activated carbon contained in the granular activated carbon treatment unit and the porous pores, 2 A physical chemical adsorption water purification treatment unit for performing differential water treatment; Integer system comprising a. The method of claim 1, An ozone injection unit for injecting ozone into the water in order to change the dissolved organic matter in the water so as to be decomposable by the microorganism; And An ozone reservoir that removes the ozone, volatile organic carbon (VOC), and both that are dissolved and remain in the water; Water purification system further comprises. The method of claim 1, The ozone storage unit, A stirring device for stirring the water; And A heating device for maintaining the water temperature in the range of 20 ° C to 40 ° C; Water purification system further comprises. The method of claim 1, And a post-treatment unit for disinfecting the water subjected to the second purified water by the physical chemical adsorption water treatment unit using ozone or ultraviolet rays. The method of claim 1, wherein the biologically activated carbon treatment comprises granular activated carbon having porous pores, The microorganisms inhabit the surface of the porous granular activated carbon. Injecting ozone into water introduced into the ozone injection unit; Removing dissolved ozone, volatile organics, or both injected into the water introduced into the ozone reservoir; Firstly purifying the water introduced into the biological activated carbon treatment unit by decomposing and removing the organic matter dissolved in the water using microorganisms included in the biological activated carbon treatment unit; Performing secondary water purification by further removing the water introduced into the granular activated carbon treatment unit by adsorbing the dissolved organic substance in the water by using the granular activated carbon included in the granular activated carbon treatment unit; And Disinfecting the water introduced into the disinfection unit; Integer method comprising a. The method of claim 6, Removing from the ozone reservoir, Stirring the water; And Maintaining the temperature of the water in the range of 20 ℃ to 40 ℃; Water purification method further comprises.

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