KR20060079172A - A water and wastewater treatment system and method using advanced oxidation processes(uv with catalyst, fenton, ozone) and pressurized ozone oxidation(aop-po2) - Google Patents

Abstract

The present invention is a device and method for treating sewage and waste water and a plurality of UV lamps are installed vertically in a sealed container and coated with titanium dioxide (TiO2) between the UV lamp space (STS 316, ceramic, glass Etc.) is filled with high pressure (4 ~ 8 atm) ozone gas in the lower part of the tank, raw water and Fenton's solution is mixed with the high-pressure ozone oxidation flow into the upper part of the contact tank. In this water treatment method, raw water injected with a certain amount of Fenton's liquid is contacted with high pressure-high concentration ozone gas while simultaneously flowing through the surface of the titanium dioxide-coated filling in a high-pressure ozonation contacting tank, and simultaneously coated with titanium dioxide When the UV (ultraviolet) light source is irradiated to the contact surface, photocatalysis, penton oxidation, and high ozone oxidation by photocatalysts occur simultaneously in a high pressure ozone gas reactor. A feature of the present invention is that the listed advanced oxidation reactions occur simultaneously in a single reaction tank in which high concentration-high pressure ozone gas is present, and the oxidative capacity is maximized by synergistic effects in which various advanced oxidations occur at the same time (1-5 minutes). An oxidation reaction takes place. The present invention is used not only for the sterilization of microorganisms used for sewage and waste water treatment, but also for the removal of color of manure (livestock manure), dyeing wastewater and pigment wastewater, and the treatment of hardly degradable organic substances in leachate and chemical wastewater in a landfill.

AOP-PO2 Process, Advanced Oxidation Process, Pressurized Ozone Oxidation, Advanced-Pressure Ozone Oxidation Process, Ozone, Color Removal, Refractory Organic Substance, Microorganism, Sterilization

Description

Water and Wastewater Treatment System and Method Using Advanced Oxidation Processes (UV with Catalyst, Fenton, and others) using titanium dioxide-coated photocatalyst and UV, Fenton oxidation and high concentration of ozone Ozone) and Pressurized Ozone Oxidation (AOP-PO2)}

1 is an explanatory diagram of the main part of a high-level and high-level ozonation water treatment method using titanium dioxide (TiO 2) -coated filler and UV (ultraviolet), and fenton and high-concentration ozone.

100: raw water pressurized pump

200: Fenton liquid injection facility

300: Advanced-Pressure Ozone Oxidation Contact Tank

400: ozone gas pressurization equipment

500: decompression micro bubble generator

Figure 2 is a detailed view of the main part constituting 300: high-pressure ozone oxidation contact bath.

301: UV Lamp

302: titanium dioxide (TiO2) coated filler

303: Constant Pressure Control System

304: water level control system

Fig. 3 is a plan sectional view in detail in a high-pressure ozone oxidation contact tank.

301: UV Lamp

302: titanium dioxide (TiO2) coated filler

4 is a vertical sectional view of FIG. 3A.

5 is a detailed view showing the flow of raw water and the irradiation direction of UV light.

301: UV Lamp

301-1: UV (ultraviolet) light irradiation shape

302: titanium dioxide (TiO2) coated filler

302-1: Filler made of ceramic, STS316, glass

302-2: coating layer of titanium dioxide (TiO2)

302-3: Shape of raw water flowing while applying filler

6 is a schematic diagram of a general ozone contact device.

1: Raw water storage tank

2: ozone generator

3: ozone gas injection device at atmospheric pressure

4: ozone contact tank

5: ozone decomposing device

6: final treated water outlet

Field of the Invention The present invention is in the field of advanced oxidation water treatment technology and is used for advanced purified water treatment, industrial wastewater, manure wastewater, and leachate treatment.

Conventional oxidation techniques include Chemical Oxidation Processes and Advanced Oxidation Processes (AOPs). The general chemical oxidation method refers to the oxidation method using a single oxidant such as ozone, chlorine, UV (ultraviolet), potassium permanganate. In addition, AOP can be classified into two types. Since the reaction medium is liquid when oxidizing contaminants in waste water, it can be divided into homogeneous and heterogeneous systems depending on the presence of solids in addition to liquid phase. Homogeneous systems include O3 / UV, H2O2 / UV, Electron beam, Ultrasonic (US), H2O2 / US, O2 / H2O2, H2O2 / Fe. Heterogeneous systems include TiO2 / O3 / UV, TiO2 / H2O2 / UV, Electro-Fenton, Solid Catalyst (SC) / O3, and SC / H2O2.

Conventional Fenton oxidation technology is a technique to increase the oxidation of hydrogen peroxide by using mixed with hydrogen peroxide (H2O2) by using a ferric iron (Fe2 +) as a catalyst, the PEREXONE method is a technology that uses hydrogen peroxide and ozone at the same time, the two materials interact It is a technology to increase the oxidative power. UV photolysis is a technique that enhances the oxidative power by irradiating UV (ultraviolet) with oxidants such as ozone and hydrogen peroxide to increase the production of OH ^- radicals. In order to increase the UV photolysis efficiency, TiO 2 coated surface has been used as a catalyst.

In other laws such conventional advanced oxidation of the present invention presses the most oxidative high oxidant ozone and OH by using O3 / H2O2 / Fe / UV / TiO2 at the same time in the same reaction vessel to the high concentration of ozone ^{present-generation} efficiency of a radical By increasing the oxidizing power is maximized. Therefore, conventionally, one or two advanced oxidation processes of the Gaza method were used separately, while in the present invention, three advanced oxidation reactions were used at the same time, and the concentration of the reaction ozone was simultaneously increased to maximize the possible oxidation power.

In the past, a method of increasing the contact time of ozone has been used in order to react ozone to waste water at a high concentration. However, the method of increasing the contact time of ozone increases the construction cost by increasing the contact tank of ozone, and the installation cost and maintenance cost of the ozone generator are remarkably increased because excessive ozone should be administered at low contact efficiency. For example, assuming that the electrochemical free energy of the ozone concentration due to the pressure provided by the ozone generator is 1, the electrochemical free energy of the ozone concentration according to the present invention is increased by 2-5 times. Therefore, the decomposition of the hardly decomposable substance is considerably higher than that by the conventional dissolution method.

In addition, in the conventional advanced oxidation method, various advanced oxidation methods are used alone or in a combination of two advanced oxidation methods simultaneously. In the present invention, it is the most advanced oxidation technology because it is composed of a system that can be applied to all of the various advanced oxidation methods at the same time in a high concentration ozone oxidation method.

The present invention includes a technology for safely depressurizing high pressure ozone water through the outflow by micro-bubble, and maximizes the treatment efficiency of wastewater and the utilization efficiency of ozone by increasing the contact area to infinity through the micro-bubble. Technology. In addition, it also has the advantage of removing the suspended solids present in the raw water to be treated by the micro-bubbles. The low pressure dissolved ozone method conventionally used does not need to generate micro bubbles, nor is it possible to generate micro bubbles. Mechanically injecting ozone has a low contact efficiency of ozone, resulting in excessive release of unreacted ozone.

Therefore, the present technology is particularly different from the conventional technology, while the conventional technology can only increase the concentration of ozone to about 40 mg / l, while the present invention can increase the concentration of ozone to the desired concentration of 200 mg / l or more, Since various advanced oxidation technologies are implemented at the same time, the conventional technology has not made a significant contribution to the treatment of livestock wastewater or leachate, but the present technology can treat hardly degradable wastewater such as chemical wastewater, leachate, and livestock wastewater. The framework was laid. In addition, by contacting ozone water through the micro-bubble secondly, it maximizes the treatment efficiency and the use efficiency of ozone, and has a device to safely reduce the high pressure and high concentration ozone water.

AOP (Advanced Oxidation) is a UV (ultraviolet) irradiation device in a pressurized tank so that AOP can be made at the same time in an environment where high concentration of ozone is present under high pressure, and by filling the contact media coated with TiO2 between UV irradiation, etc. Oxidation can be done effectively. In addition, in order to allow the phenton and ozone interactions such as the PEREXONE method, the Fenton oxidation method, and the UV (ultraviolet) photolysis method to occur at the same time, a device for introducing Fenton into the high-pressure ozone oxidation tank is applied.

Another challenge is to increase the concentration of ozone in the sewage or wastewater that enters the high-pressure ozone oxidizer in order for AOP to occur effectively. When ozone is dissolved at atmospheric pressure according to the conventional method, it can only be increased to about 40 mg / l, the solubility level of ozone, so that wastewater requiring high concentration of ozone 100mg / l-200mg / l, such as livestock wastewater, is conventionally used. Has no great effect. However, when ozone gas is applied in a sealed pressurized container, ozone can be added to a much higher concentration of 200 mg / l or more. In this case, the technology of injecting ozone into a high pressure sealed container is to achieve the problem, which is to put the buffer water in the ozone gas and the ozone pressurization portion in the pressurizing device to avoid direct contact between the pressurizing device and the ozone gas, and to avoid the oxidizing material such as ST316. Is done using. In order to increase the use efficiency of the injected ozone is another task to increase the contact efficiency of ozone and wastewater, which is achieved by maximizing the contact area of ozone bubbles and water by flowing high concentration and high pressure ozone water through the micro bubble generator.

The configuration of the present invention consists of a raw water pressurized pump 100 for introducing the raw water to the upper portion of the high-pressure ozone oxidation contact tank in Figure 1 and the Fenton liquid injection facility 200 for adding the Fenton liquid, the Fenton liquid is injected Advanced pressurized ozone oxidation contact tank (300) in which the raw water is introduced and advanced oxidation reaction occurs simultaneously, and ozone gas pressurization facility (400) for injecting ozone gas into the lower portion of the advanced pressurized oxidation contact tank, safely treating the high pressure treated water. It is composed of a pressure-sensitive micro-bubble generating device 500 for generating a micro bubble by reducing the pressure.

As shown in FIG. 2, a filler (material: STS 316, ceramic, glass) 302 coated with titanium dioxide (TiO 2) is filled in the high-pressure ozone oxidation contact tank, and a plurality of UV lamps 301 are provided between the fillers. It is inserted. In addition, a constant pressure control system 303 is installed at the upper part of the contact tank, and a water level control system 304 is provided at the lower part of the contact tank so that the water level in the tank is always lower than the filling material. have.

3 is a plan view of the high-pressure ozone oxidizing tank. In the plan view, 301 is a UV lamp and 302 is a filler coated with a photocatalyst.

4 is a cross-sectional view around a filler coated with a photocatalyst between UV lamps. Ultraviolet rays were irradiated from the UV lamp of 301 and raw water mixed with Fenton's solution flowed between the fillers of 302.

Fig. 5 is raw water 302-3 irradiated with ultraviolet ray 301-1 from the UV lamp 301, and the Fenton liquid is mixed between the filler 302-1 coated with the catalyst material 302-2 around the UV lamp. ), Advanced oxidation of O3 / H2O2 / Fe / UV / TiO2 occurs simultaneously.

6 shows a general ozone contact bath. 6 is a reservoir of raw water to be treated, and 2 is an ozone generating device. When raw water flows into the treatment tank, it is mixed with ozone by the ozone spray device of 3 and reacts in the reaction tank of 4. Unreacted ozone is decomposed by the flue gas cracker of 5 and then discharged, and treated water is discharged to 6.

Sewage and wastewater contain wastewater containing a large amount of harmful microorganisms, and many of them contain high chromaticity, such as dyeing wastewater and pigment wastewater. In addition, many livestock wastewater, manure wastewater, waste landfills and chemical plant wastewater contain hardly decomposable organic substances. Since these wastewaters are not treated well by microorganisms, conventionally, microorganisms are selected in combination with chemical treatments such as ozone or Fenton (H 2 O 2) oxidation.

In the present invention, in order to treat such sewage or wastewater, a system capable of simultaneously applying various oxidized oxidation techniques of AOP to a system capable of applying a high concentration of ozone was maximized. When an appropriate amount of Fenton's liquid is mixed into the sewage or wastewater and introduced into the upper part of the high-pressure ozone reactor, it interacts with the photocatalyst filled between the ultraviolet rays irradiated from the UV lamp inside the reactor and the lamp, and the fenton and ozone, and the Fenton and UV (Ultraviolet rays), various advanced oxidations with the interaction of UV and ozone occur simultaneously in one place. It also maximized the advanced oxidation capacity by supplying enough ozone to generate advanced oxidation.

Although the prior art can only make the concentration of ozone in the treated water up to about 40 mg / l, the present technology can easily make 200 mg / l or more, and by using ozone water having high pressure and high energy as energy to make micro bubbles. Increasing the contact area maximizes treatment efficiency and ensures safe outflow. That is, the amount of ozone required for wastewater treatment can be contacted at a high concentration in a short time, thereby significantly lowering the equipment cost and maintenance cost. In particular, the use efficiency of ozone is maximized to minimize the occurrence of excess ozone.

Currently, at home and abroad, treatment of industrial complex wastes such as dyeing wastewater and pigment wastewater, or hardly degradable organic matters such as livestock wastewater and leachate has become a social problem, but it can be easily treated if the present technology is applied.

Claims (4)

In the high-pressure ozone oxidation treatment apparatus for water treatment, a raw water inflow pump, a Fenton liquid injector, a high-pressure ozone oxidation contact tank, a high pressure ozone injection device, a high pressure ozone water outlet device, a micro bubble generator, a contact tank, a vessel Ozone decomposer, UV lamps installed in high-pressure ozone oxidation tank, fillers coated with TiO ₂ (UVS) such as STS 316, ceramics, glass, etc., water level regulators and pressure regulators of high-pressure ozone reactors Apparatus and method for treating drinking water and sewage or wastewater using Advanced-Pressure Ozone Oxidation (AOP-PO2) The ozone injection apparatus and method for injecting ozone at a high pressure (4 to 8 kgf / cm 2 or more) into a high-pressure ozone oxidation reactor according to claim 1 The microbubble contact tank and high-pressure reaction water of claim 1, wherein the high-pressure ozone oxidation reactor safely depressurizes to normal atmospheric pressure and contacts the unreacted material with micro ozone bubbles to maximize the removal of contaminants. A reduced pressure discharge device and a micro bubble generator and method for reducing the pressure to atmospheric pressure; And an ozone decomposing device for decomposing the ozone; The apparatus of claim 1, further comprising a UV lamp for advanced oxidation, a filler (coated with STS 316, ceramic glass, etc.) coated with TiO ₂ and a pump for introducing Fenton liquid into the feed water line;

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