KR200359162Y1 - Waste Water Filtering System Using Ozone Oxidation - Google Patents

Abstract

The present invention relates to a wastewater filtration treatment system using ozone which minimizes the amount of effluent and improves the wastewater treatment efficiency. The sediment separation and separation of inorganic material having a predetermined gravity or more from the raw water passing through the screen is performed. A sedimentation tank, a flow rate adjusting tank for collecting raw water from which minerals of a predetermined specific gravity or more are separated from the settling tank, an oil-water separator for separating oil from raw water introduced from the flow rate adjusting tank, and collecting and removing the separated oil, and separating the oil-water An ozone oxidizer for ozone oxidizing primary treated water from which oil has been separated and removed by the apparatus, and after mixing the secondary treated water ozonated by the ozone oxidizer with pressurized water, it is used to generate microbubbles using a pressure difference. Scum separating apparatus for separating and treating scum by raising contaminants below a certain specific gravity by And a treated water tank for filtering and adsorbing tertiary treated water separated by a scum, and a treated water tank for collecting the final treated water filtered by the filter. According to the configuration as described above, there is an advantage that the processed discharged material can be minimized and the final treated water can be used immediately.

Description

Waste Water Filtering System Using Ozone Oxidation

The present invention relates to a wastewater treatment system. Particularly, the influent wastewater is removed from the wastewater by a multi-stage process such as the removal of contaminants, sedimentation, oil and water separation, ozone oxidation, scum scrubbing, filtration and adsorption. The present invention relates to a wastewater filtration treatment system using ozone that is minimal and suitable for direct reuse of the final treated water.

In general, the method of treating car wash waste water includes physical methods such as screening, precipitation, flotation, and filtration, and chemical treatment methods such as neutralization, redox, flocculation and adsorption, and purification according to microbial culture. Biological methods that occur.

In addition, the most important point in a device or method for separating and removing detergent, oil particles or debris contained in the car wash waste water is treated in consideration of the characteristics of the oil particles and the degree of mixing of the suspension.

And, according to the size of the oil particles contained in the car wash waste water, the characteristics of the oil, first, the oil when the diameter of the oil particles is 150㎛ or more free oil (oil), when the diameter of the oil particles is 60㎛ or less It is divided into emulsion oil (emulsion oil), and adherent oil (oil wet soild) that is attached to certain particles.

On the other hand, when looking at the apparatus for treating according to the size of the oil particles, a simple gravity separation oil-water separator suitable for separating the free oil, and a pressure floating separator suitable for treating the emulsion oil and the adhesive oil is used.

However, at present, the oil-containing car wash wastewater treatment apparatus mostly uses a simple gravity separation oil / water separator without considering the size of the oil particles contained in the car wash wastewater. Is being raised.

In addition, the efficiency of installation and operation of the pressurized flotation separator is falling, and the reason for this is a problem that the efficiency of separation and collection of oil particles is lowered due to the deterioration of the technology of generating the dissolved air introduced into the car wash wastewater containing oil. .

In the pressurized flotation method using the microbubbles used in the related art, microbubbles are simply generated and introduced into the treated water. In this case, the microbubbles and the treated water do not mix well. As a result, the microbubbles are scattered on the floc. There was a problem that is not attached well.

The present invention was created to solve the problems of the prior art as described above, an object of the present invention, a multi-stage treatment system, such as oil and water separation treatment, ozone oxidation treatment, pressure flotation treatment, depending on the characteristics of the pollutants contained in the waste water The present invention provides a wastewater filtration treatment system using ozone that enables the final treated water to be directly reused without discharge.

Another object of the present invention is to provide a wastewater filtration treatment system using ozone which minimizes sludge generation by oxidizing organic substances contained in treated water by ozone oxidation without using chemicals.

Still another object of the present invention is to provide a wastewater filtration treatment system using ozone equipped with an oil / water separator that can continuously and automatically remove oil separated from raw water in the oil / water separation treatment step.

Another object of the present invention is to allow the scum to float efficiently by mixing the pressurized water and the treated water by a mixer in advance during the scum treatment by the pressure floating so that the fine bubbles adhere to the contaminants smoothly. To provide a suitable wastewater filtration treatment system using ozone.

Still another object of the present invention is to provide a wastewater filtration treatment system using ozone equipped with a scum separation device capable of dissolving air in a pressurized tank and generating microbubbles by dissolved air without using a separate microbubble generator. There is.

1 is a block diagram of a wastewater filtration treatment system using ozone according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of FIG. 1.

3 is a cross-sectional view of the internal configuration of the mixer of FIG.

4 is a flowchart of a process of filtering wastewater by the wastewater treatment filtration system of FIG. 1.

Explanation of symbols on the main parts of the drawings

110; Screen tank 120; Tide

130; Flow adjustment tank 140; Oil-water separator

150; Ozone oxidizer 160; Scum separator

170; Filter 180; Treated water tank

200; Collecting tank 212; screen

310; Oil / water separator 320; Waste Oil Storage Tank

330; Oil remover 331; Oil collector

331a; Inlet groove 332; Oil feed pipe

340; Separation water flow control membrane 350; Water level control

410; Ozone oxidizer 420; Ozone generator

430; Ozone ejector 440; Ozone remover

510; Pressurized floatation tank 520; Air ejector

530; Pressurized tank 540; Mixer

541a; A first mixing member 541b; Second mixing member

541c; Third mixing member B1; septum

P1; Raw water feed pump P2; Primary Treatment Water Transfer Pump

P3; Pressurized pump P4; Filtration Pump

P5; Reuse pump P6; Backwash pump

L1; Raw water feed pipe L2; 1st treatment water transfer pipe

L3; Secondary treated water feed pipe L4; Pressurized Water Transfer Pipe

L5; Third treatment water feed pipe L6; Final treated water pipe

L8; Backwash water feed pipe D1; 1st return pipe

D2; Second conveying pipe D3; 3rd return pipe

Wastewater filtration treatment system using ozone according to the present invention for achieving the above object, in the wastewater treatment system, the screen for filtering the contaminants of a predetermined size or more in the waste water, the gravity of inorganic matters of a certain specific gravity or more from the raw water passing through the screen A sedimentation tank for solid-liquid separation by sedimentation, a flow control tank for collecting raw water from which minerals of a predetermined specific gravity or more are separated from the sedimentation tank, oil is separated from raw water introduced from the flow control tank, and the separated oil is automatically collected and removed. After the oil-water separator for storing, the ozone oxidizer for ozone oxidation treatment of the primary treatment water from which the oil is separated and removed by the oil-water separator, the air is dissolved in the secondary treatment water ozonated by the ozone contact device After mixing with pressurized water, a specific specific gravity is generated by the generation of microbubbles due to the pressure drop of the mixed secondary treated water. A scum separator for separating and treating scum due to the following contaminants, a filter for filtering and adsorption of the tertiary treated water separated by the scum separator, and a final treatment filtered by the filter It characterized in that it comprises a treated water tank for collecting water.

Next will be described in detail with reference to the accompanying drawings, a preferred embodiment of the wastewater filtration treatment system using the present invention.

The present invention relates to a wastewater filtration treatment system for filtering filtration for general wastewater including, for example, car wash wastewater, home wastewater, factory wastewater, etc. do.

1 is a block diagram of a wastewater filtration treatment system using ozone according to an embodiment of the present invention.

As shown in Figure 1, the wastewater filtration treatment system using ozone according to an embodiment of the present invention, the screen tank 110, the sedimentation tank 120, the flow rate adjustment tank 130 and the oil-water separator 140 and The ozone oxidizer 150, the scum separator 160, the filter 170, and the treated water tank 180 are configured to be included.

The screen tank 110 is provided with a screen 212 to be described later, to filter out impurities of a predetermined size or more contained in the car wash wastewater introduced by the screen (212).

The sedimentation tank 120 stores the raw water in which the contaminants are filtered by the screen tank 110, and the raw water stored in the sedimentation tank 120 has a specific gravity more than a predetermined specific gravity, for example, soil, sand, and other inorganic materials. Gravitational sedimentation.

The flow adjustment tank 130 collects raw water from which inorganic matters are separated by the sedimentation tank 120.

The oil / water separator 140 separates oil from raw water introduced from the flow adjustment tank 130, collects and removes the separated oil, and stores the oil.

The ozone oxidizer 150 oxidizes ozone (O ₃ ) to the primary treated water from which oil is removed by the oil / water separator 140.

The scum separator 160 mixes the secondary treated water ozone-oxidized by the ozone oxidizer 150 with the pressurized water containing dissolved air, and then the pressure of the mixed pressurized water and the secondary treated water. Due to the drop of microbubbles due to the drop, contaminants below a certain specific gravity are floated, and the floating scum is separated.

The filter 170 filters and adsorbs tertiary treated water from which scums are separated by the scum separator 160.

The treated water tank 180 collects the final treated water filtered by the filter 170.

2 shows a detailed configuration diagram of FIG. 1. Based on Figure 2 will be described in detail the configuration of the wastewater filtration treatment system using ozone according to an embodiment of the present invention.

First, the screen tank 110 is fixedly installed on one side of the upper portion of the collection tank 200, the screen tank 212 is provided with an inclination to filter the impurities.

The collection tank 200 includes the sedimentation tank 120 and the flow rate adjustment tank 130, and the sedimentation tank 120 and the flow rate adjustment tank 130 are partitioned by the partition B1. The partition B1 adjusts the maximum height of the raw water collected in the sedimentation tank 120.

The flow rate adjustment tank 130 and the oil water separator 140 are connected by a raw water feed pipe (L1). A raw water feed pump P1 for smoothly transferring the raw water collected by the flow rate adjusting tank 130 to the raw water feed pipe L1 is installed at the start end of the raw water feed pipe L1.

The oil-water separator 140 includes an oil-water separator tank 310, a waste oil storage tank 320, an oil remover 330, a separator water flow control membrane 340, and a water level control membrane 350.

The oil and water separation tank 310 collects the raw water introduced from the raw water transport pipe (L1), the raw water introduced into the oil and water separation tank 310, the oil, for example free oil is separated by the specific gravity difference.

The oil remover 330 collects and transfers free oil separated in an upper layer from the oil / water separation tank 310.

The waste oil storage tank 320 stores the oil transferred from the oil remover 330.

The separation water flow control membrane 340 is spaced apart from the bottom surface of the oil and water separation tank 310 by a predetermined interval to block the flow of the separated oil, the oil separated in the separated water (oil-water separation tank 310) The remaining raw water, except for the oil separated by gravity from among the introduced raw water, is referred to as 'separated water', which is used throughout the present specification to control the flow of the same).

In addition, the water level control membrane 350 is spaced apart from the separation water flow control membrane 340 by a predetermined space and is installed in close contact with the bottom surface of the oil / water separation tank to adjust the water level of the separation water.

In addition, the oil remover 330 is composed of an oil collecting container 331 and an oil transfer pipe 332. The oil collecting vessel 331 collects oil, for example, free oil, which is gravity-separated by the oil / water separation tank 310, and the oil transfer pipe 332 collects the free oil captured by the oil collecting vessel 331. Transfer without power.

The oil collecting container 331 is formed with an opening so that the specific gravity separated, for example, free oil can flow therein. Preferably, the oil collecting container 331 is formed with an inlet groove 331a into which the free oil separated from the specific gravity is introduced.

The oil collecting container 331 is provided with a rotating shaft 331b, it is preferable that the rotating shaft 331b is fixed to the oil-water separation tank 310. In addition, the rotation shaft 331b is preferably installed at the same height as the height of the water level control film 350.

The oil-water separation tank 310 and the ozone oxidizer 150 are connected by a primary treatment water transfer pipe L2. The primary treatment is performed by treating the primary treatment water separated by oil by the oil-water separation tank 310. The primary treatment water transfer pump P2 for smoothly transferring the water transfer pipe L2 is installed in the primary treatment water transfer pipe L1.

The ozone oxidizer 150 ozone oxidation to ozone oxidize the primary treated water by contacting the ozone generator 420 for generating ozone and ozone introduced from the ozone generator 420 to the primary treated water. Group 410, an ozone remover 530 for removing residual ozone, and an ozone ejector 430 for inducing ozone.

The scum separating device 160 is composed of an air ejector 520, a pressure pump P3, a pressure tank 530, a mixer 540, and a pressure float tank 510.

The air ejector 520 introduces external air, and the pressure pump P3 pumps the pressurized water introduced from the pressure levitation tank 510 together with the external air introduced from the air ejector 520 to pressurize the tank. Transfer to 530.

The pressure tank 530 maintains a predetermined pressure or more to dissolve external air introduced from the pressure pump P3 in pressurized water.

The mixer 540 mixes pressurized water in which external air introduced from the pressure tank 530 is dissolved with secondary treated water introduced from the ozone contactor 410.

The pressurized floatation tank 510 receives the secondary treated water mixed with the pressurized water in which air is dissolved from the mixer 540, and the pressure difference (pressure in the pressurized tank 530 and in the pressurized floatation tank 510). The scum is separated by floating contaminants (e.g., emulsion oil, etc.) below a predetermined specific gravity by the microbubbles generated by the difference from the atmospheric pressure.

One embodiment of the mixer 540 configuration is shown in FIG. 3. As shown in FIG. 3, the internal configuration of the mixer may be spaced apart from the first mixing member 541a and the first mixing member 541a vertically protruding at a predetermined height from the inner bottom surface, and disposed on the inner upper surface. A second mixing member 541b protruding vertically downward in a predetermined length, and a third mixing member 541c spaced vertically from the second mixing member 541b at a predetermined height and spaced vertically at a predetermined height. Each of the above configurations (first mixing member, second mixing member, third mixing member) has a zigzag structure so that the pressurized water dissolved in the secondary treated water and the outside air can be smoothly mixed.

The pressurized floatation tank 510 and the filter 170 are connected by the third treatment water transfer pipe (L3). The third treatment water transfer pump P3 for smoothly transferring the third treatment water separated by the scum separation device 160 to the third treatment water transfer pipe L3 is the third treatment water transfer pipe. It is installed at (L3).

The final treated water filtered and adsorbed by the filter 170 is connected to the treated water tank 180 by the final treated water transport pipe L6.

The following describes the return line system of the processing result. The waste oil storage tank 320 and the sedimentation tank 120 are connected by the first conveying pipe D1, and the pressurized floatation tank 510 and the sedimentation tank 120 are connected to the second conveying pipe D2. The filter 170 and the sedimentation tank are connected by a third conveying pipe D3, but the first conveying pipe D1, the second conveying pipe D2, and the third conveying pipe D3 are connected to each other. Is a transfer pipe that drains the treated water for reprocessing the treatment result (oil, scum, and foreign matter filtered by the filter) at each stage.

The following describes a process for treating wastewater by an embodiment of the present invention having the configuration as described above.

4 is a flowchart illustrating a process of filtering wastewater by the wastewater filtration treatment system using ozone according to an embodiment of the present invention.

First, when the car wash and waste water flows into the screen tank 110, the contaminants such as coarse contaminants, giant contaminants and the like are filtered by the screen net 212 inclined in the screen tank 110 (step S1).

Raw water of the car wash waste water from which the contaminants are separated and removed as described above is introduced into the sedimentation tank 120 by natural descent. Raw water introduced into the sedimentation tank 120 is, for example, soil, sand and other inorganic logistics having a specific gravity or more is gravity sedimentation due to the specific gravity difference is separated from the raw water and solid-liquid (S2 step).

When the flow rate of the raw water in which the soil, the day after tomorrow, and the other inorganic logistics flowed into the sedimentation tank 120 has a height greater than or equal to the partition wall B1, the flow rate flows through the partition wall B1 and flows into the flow rate adjustment tank 130. do.

The fresh water capacity of the flow adjustment tank 130 is large enough to be discharged by the raw water transfer pump P1 irrespective of the flow rate of the raw water flowing from the sedimentation tank 120.

By the pumping of the raw water feed pump (P1), the raw water of the flow rate adjustment tank 130 flows out to the oil-water separation tank 310 along the raw water feed pipe (L1).

Raw water introduced into the oil / water separation tank 310 from the flow regulating tank 130 is separated by specific gravity while oil such as free oil is stratified to the upper layer due to the difference in specific gravity.

At this time, the water level of the raw water except for the oil separated from the specific gravity maintains the height of the level control membrane 350. In addition, the specific gravity separated oil may not pass through the separation water flow control membrane 340 at the same time the flow is blocked by the separation water flow control membrane 340. Therefore, the gravity-separated oil cannot go beyond the water level control membrane 350, and only raw water except oil may flow through the water level control membrane 350 through the bottom of the separation water flow control membrane 340. The flow in the oil / water separation tank 310 of the separated water except for the oil separated by gravity is shown by an arrow in FIG. 2.

The oil separated by gravity from the oil / water separation tank 310 as described above is collected in the oil collecting container 331 while flowing into the inflow groove 331a of the oil collecting container 331.

The oil collected in the oil collecting container 331 is transferred through the oil transfer pipe 332 and flows into the waste oil storage tank 320. The oil collected in the oil collecting container 331 is transferred to the waste oil storage tank 320 through the oil conveying pipe 332 by gravity.

As described above, raw water having a low specific gravity among the oil stored in the waste oil storage tank 320 is separated from the free oil collected and transported again to form a lower layer, and the raw water thus formed is immersed through the first conveying pipe D1. Drained to thread 120 and repeat the car wash waste water treatment process again.

The primary treated water treated with the free oil separated from the oil / water separation tank 310 is pumped by the primary treated water pump P2 to the ozone oxidizer 410 through the primary treated water transfer pipe L2. Inflow.

In the ozone oxidizer 410, the introduced primary treated water and the ozone introduced by the ozone ejector 430 contact each other, so that the primary treated water is ozonated (step S5).

The process of ozone oxidation of the primary treated water as described above is one of the technical gist of the present invention, by performing the ozone oxidation treatment on the primary treated water can lower the COD (Chemical Oxygen Demand) value, by removing the organic matter Sludge generation can be minimized.

As a result of performing ozone oxidation treatment on the primary treated water, there is also a side effect of increasing the porosity of activated carbon (not shown), which is a filter medium of the filter 170.

The ozone oxidized secondary treatment water in the ozone oxidizer 410 is introduced into the mixer 540. In the mixer 540, pressurized water in which the secondary treated water introduced and the external air introduced from the pressure tank 530 are dissolved is mixed.

The process of mixing the secondary treated water and the pressurized water in which the outside air is dissolved is described in more detail. Pressurized water from the pressurized floatation tank 510 (this pressurized water is the same as the actual tertiary treated water) and external air introduced from the air ejector 520 are mixed and transferred to the pressurized tank 530 by the pressurized pump P3. do.

The pressurized tank 530 maintains a pressure of about 3 kg / cm 2, for example, so that the introduced outside air is dissolved in pressurized water, which is a solvent, in the pressurized tank 530. The pressurized water in which the outside air is dissolved is introduced into the mixer 540 and mixed with the secondary treated water.

The pressurized water and the secondary treated water introduced by the internal configuration as shown in FIG. 3 are smoothly mixed and flowed out to the pressurized floatation tank 510.

The secondary treated water mixed with the pressurized water is placed in the atmospheric pressure state at the moment it flows into the pressurized floatation tank 510, and since the pressure drop occurs, the external air dissolved in the pressurized water generates fine bubbles. .

The fine bubbles thus generated are attached to contaminants having a predetermined specific gravity or less, such as emulsion oil, which are present in the secondary treated water and are floated (step S7).

Scum that emerged in the above process is drained back to the immersion tank 120 through the second conveying pipe (D2) to undergo a reprocessing process.

A part of the tertiary treated water from which the scum is separated as described above is used as pressurized water as described above, and a part of the tertiary treated water is transferred to the tertiary treated water transfer pipe L5 by pumping the filtration pump P4. Since the closed loop of the pressurized pump P3, the pressurized tank 530, the mixer 540, and the pressurized floatation tank 510 is formed, the quantity of the tertiary process water used as pressurized water is constant.

The third treated water introduced through the third treated water conveying pipe (L5) is collected into the treated water tank 180 through the final treated water conveying pipe (L6) as the final treated water through a process such as filtration adsorption in the filter. do.

The final treated water collected in the treated water tank 180 is treated as a non-discharged reused water which can be directly used for the next washing process because the washed wastewater is treated by the above-described multistage treatment process and ozone oxidation treatment.

The foreign matter filtered in the filtration adsorption process in the filter 180 is subjected to periodic backwashing by pumping the backwash pump P6 to be drained to the immersion tank 120 through the third conveying pipe D3 and then re-received. Will be processed.

Therefore, all the treatment results to be taken out during the precession of wastewater treatment according to one embodiment of the present invention are all stored in the waste oil storage tank.

The internal structure of the mixer 540 according to an embodiment of the present invention is illustrated in FIG. 3, but the internal structure of the mixer 540 is not limited thereto, and the second treatment water flowing from the ozone contactor 410 is provided. And if the configuration that can smoothly mix the solvent flowing from the pressure tank 530 belongs to the technical scope of the mixer according to the present invention, of course.

The embodiment of the present invention is just one embodiment of the technical idea of the present invention, and in the person skilled in the art, other modified embodiments are possible within the technical idea of the present invention.

Wastewater filtration treatment system using ozone according to the present invention having the configuration and operation process as described above has the following effects.

First, the sewage wastewater treatment efficiency is increased by treating the car wash wastewater by the multi-stage process such as the separation of contaminants, gravity sedimentation, oily water separation, ozone oxidation treatment, scum flotation after filtration of pressurized water and treated water, and filtration treatment. There is an effect that can be reused immediately without releasing the final treated water.

Second, by providing an oil remover in the oil and water separator, there is an effect that can automatically remove the oil separated from the raw water in real time.

Third, the ozone oxidation treatment of the secondary treated water, there is an effect that the sludge generation is minimized.

Fourth, by the mixing of the treated water and pressurized water by the mixer, the fine bubbles adhere to the oil of the treated water more smoothly, and as a result, the amount of scum that rises is increased, resulting in an overall system treatment efficiency. have.

Fifth, by increasing the pressure by the pressure tank and not by a separate micro bubble generator, by exposing to atmospheric pressure, there is an effect that the generation efficiency of the fine bubbles is better.

Sixth, by reprocessing the processed matter generated in each step, it is possible to minimize the amount of the final discharge, the system processing efficiency is increased.

Claims (11)

In wastewater treatment systems: A screen for filtering contaminants of a predetermined size or more from the wastewater; A sedimentation tank for solid-liquid separation of inorganic substances having a predetermined specific gravity or more from raw water passing through the screen by gravity settling; A flow rate adjusting tank for collecting raw water from which the inorganic material having a predetermined specific gravity or more is separated from the sedimentation tank; An oil and water separator for separating oil from raw water introduced from the flow rate adjustment tank, and automatically collecting and removing the separated oil; An ozone oxidizer for ozone oxidizing primary treated water from which oil is separated and removed by the oil / water separator; After mixing the secondary treatment water ozone-oxidized by the ozone contact device with the pressurized water in which air is dissolved, contaminants below a predetermined specific gravity are floated due to the generation of microbubbles due to the pressure drop of the mixed secondary treatment water. A scum separating apparatus for separating and processing scum; A filter for filtering and adsorbing tertiary treated water separated by a scum by the scum separator; Wastewater filtration treatment system using ozone, characterized in that it comprises a treated water tank for collecting the final treated water filtered by the filter. According to claim 1, wherein the oil-water separator, An oil-water separation tank for collecting the raw water introduced from the flow control tank and separating the oil by specific gravity; An oil remover for collecting and transporting the oil separated from the oil / water separation tank; A waste oil storage tank storing oil transferred from the oil remover; A separation water flow control membrane installed to be spaced apart from the bottom surface of the oil / water separation tank to block the flow of the oil and to control the flow of the separation water separated by the oil by the oil remover; And, Wastewater using ozone, characterized by comprising a water level control membrane spaced apart from the separated water flow control membrane and in close contact with the bottom surface of the oil-water separation tank to adjust the level of the separated water oil separated by the oil remover. Filtration treatment system. The oil and water separator of claim 2, An oil collecting unit for collecting the oil separated from the oil / water separation tank; Wastewater filtration treatment system using ozone, characterized in that consisting of an oil conveying pipe for conveying the oil collected by the oil collecting unit. The method of claim 3, wherein the oil collecting unit, Wastewater filtration treatment system using ozone, characterized in that the inlet groove is formed that is an inlet for oil. The method of claim 4, wherein the oil collecting unit, And a rotation shaft, wherein the rotation shaft is fixed to the oil / water separation tank at the same position as the height of the water level control membrane. The method of claim 1, wherein the ozone oxidizer, An ozone generator that generates ozone; And ozone oxidizer for ozone oxidizing the primary treated water by bringing ozone introduced from the ozone generator into contact with the primary treated water. The scum separator according to any one of claims 1 to 6, An ejector for introducing external air; A pressurizing pump configured to transfer external air introduced from the ejector together with pressurized water; A pressurized tank which maintains a predetermined pressure or more to dissolve external air introduced from the pressurized pump in the pressurized water; A mixer for mixing the pressurized water and the secondary treated water in which external air introduced from the pressurized tank is dissolved; And, The secondary treatment water mixed with the pressurized water dissolved in the air is supplied from the mixer, and the scum is separated by floating contaminants below a predetermined specific gravity by generating microbubbles due to the pressure drop of the mixed secondary treatment water. Wastewater filtration treatment system using ozone, characterized in that comprising a pressurized floatation tank. The method of claim 7, wherein the mixer, A first mixing member vertically protruding from the inner bottom surface at a predetermined height; A second mixing member spaced apart from the first mixing member by a predetermined interval, the second mixing member protruding vertically downward on the inner upper surface by a predetermined length; And, And a third mixing member spaced apart from the second mixing member by a predetermined distance and vertically protruding from the second mixing member at a predetermined height on the inner bottom surface. According to claim 2, The waste oil storage tank, The wastewater filtration treatment system using ozone, characterized in that the first conveying pipe for connecting the treated water separated by oil by the oil / water separator to the sedimentation tank is connected. The method of claim 7, wherein the pressure float tank, A waste water filtration treatment system using ozone, wherein a second conveying pipe for conveying the scum to the sedimentation tank is connected. The method of claim 10, wherein the filter, A wastewater filtration treatment system using ozone, characterized in that a third conveying pipe for conveying the foreign matter filtered by the backwashing treatment with backwashing water to the settling tank is connected.