KR100954886B1 - Method and apparatus for recycling sewage and waste water by highly oxidative treatment - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus equipped with a reaction tank including an ozone oxidation unit, an ultraviolet oxidation unit, and a catalyst unit, and a wastewater treatment method using the same. In addition, the present invention is further provided with a collecting tank immersing the separator on top of the reaction tank to remove particulate matter by the separator, and then passed through the reaction tank equipped with ozone oxidation unit, ultraviolet oxidation unit and the catalyst unit to contain harmful substances contained in the waste water. The present invention provides a wastewater treatment apparatus and a wastewater treatment method for removing an excessive amount of active groups such as ozone and radical hydroxide generated in a reaction tank.

The present invention is a hybrid advanced treatment technology using membrane / ozone / ultraviolet / catalyst combining these methods from ozone treatment method, membrane separation method, activated carbon treatment method, and advanced oxidation method which are used in the existing wastewater advanced treatment method. Membrane separation removes fine particles, and ozone, OH radicals and activators generated by ozone, ultraviolet rays and catalysts decompose and remove molecular organic compounds, so treated water can be used as recycled water to reduce environmental pollution load. Can be.

Advanced Oxidation, Wastewater Treatment, Ozone, Ultraviolet Lamp, Catalyst, AOP

Description

Method for treating sewage and waste water by highly oxidative treatment

The present invention relates to a method for treating sewage, sewage, and wastewater, which are environmental pollutants. More specifically, a hollow fiber membrane is installed in front of a treatment facility to remove particulate matter, and a catalyst containing ozone, an ultraviolet lamp, and titanium dioxide at a rear end thereof. The present invention relates to a method for removing harmful organic substances contained in waste water by using an excessive amount of active groups such as radical hydroxide produced by the rear end.

In general, advanced treatment methods for wastewater and purified water are classified into ozone treatment, membrane separation, activated carbon treatment, and advanced oxidation.The membrane separation methods include MF (Microfiltration), UF (Ultrafiltration), RO (Reverse Osmosis), NF (Nanofiltration, Nanofiltration), electrodialysis, etc. The activated carbon treatment method is divided into powder activated carbon, granular activated carbon, and bio activated carbon. Ozone / high pH using ozone and ozone, ozone / hydrogen peroxide, ozone / UV, and hydrogen peroxide / UV.

The ozone oxidation method is a method of dissolving ozone in wastewater to decompose molecular organic compounds contained in wastewater. It is effective in removing THM (trihalomethane) precursors, color or odorous substances, and ozone has excellent sterilization effect. It kills all bacteria of water and does not produce chlorine-based organic compounds such as THM that can be generated during chlorine sterilization. However, ozone generators are expensive and decomposition of organic compounds by ozone is selective.

Membrane separation method is a method of removing contaminants by filtration using semi-permeable polymer membrane. It was developed around RO (reverse osmosis filtration) for desalination of industrial water.In developed countries, wastewater treatment standards and water treatment standards are gradually strengthening. Applicability of MF, UF, RO, NF, etc. to the water treatment process is being developed as a method for making it suitable for the process. However, in Korea, membrane method is used for domestic water purifier combining MF, UF, RO and activated carbon as water treatment technology, and it is not practical to use due to expensive facility investment cost for mass treatment of waste water and purified water. .

Activated carbon treatment is a porous activated carbon that removes and adsorbs trace amounts of adsorbable organic compounds in raw water. Because it contains a lot of capacity, the capacity of the treatment facility is large, and the activated carbon exchange cycle is short, so it is rarely used for wastewater treatment.

The advanced treatment method produces OH radicals with high oxidizing power by using chemicals such as ozone, hydrogen peroxide, ultraviolet rays, iron salts and titanium dioxide alone, or generates excess OH radicals in ozone / high pH and ozone. / Ozone / Hydrogen Peroxide, Ozone / UV, Hydrogen Peroxide / UV are produced by the combined method to completely decompose molecular organic compounds in waste water into carbon dioxide and water. However, the single treatment method is difficult to produce a sufficient amount of OH radicals to decompose the molecular organic compounds contained in the wastewater, or it can react with a large number of organic compounds to reduce the treatment efficiency. In order to inject excessive chemicals, high initial investment and operation and management costs are required. In addition, the combined treatment method has better treatment efficiency in a small treatment facility than a single treatment method, but when treating a large capacity, only a part of the combined treatment method has been put to practical use due to the increase in initial investment cost, high maintenance cost, and problems of treatment efficiency.

Therefore, the present invention has been made in order to solve the problems that may occur during the advanced treatment of wastewater and water as described above, the treatment apparatus can be treated to a large amount of wastewater, the initial investment cost and maintenance costs are general high processing method It is an object of the present invention to provide a wastewater treatment apparatus and a wastewater treatment method capable of inexpensively and effectively decomposing organic compounds.

In addition, it is an object of the present invention to provide a wastewater and water treatment facility having a superior treatment efficiency, lower initial investment and maintenance costs than the existing advanced treatment method according to the characteristics of the wastewater generated.

In order to achieve the above object, the present inventors have developed an apparatus and method for installing an ultrafiltration membrane in a wastewater collection tank, and highly treating wastewater and wastewater through a reaction tank including an ozone oxidation unit, an ultraviolet oxidation unit, and a catalyst unit.

The present invention relates to a wastewater treatment apparatus equipped with a reaction tank including an ozone oxidation unit, an ultraviolet oxidation unit, and a catalyst unit, and a wastewater treatment method using the same. In addition, the present invention is further provided with a collecting tank immersing the separator on top of the reaction tank to remove particulate matter by the separator, and then passed through the reaction tank equipped with ozone oxidation unit, ultraviolet oxidation unit and the catalyst unit to contain harmful substances contained in the waste water. The present invention provides a wastewater treatment apparatus and a wastewater treatment method for removing an excessive amount of active groups such as ozone and hydroxylated radicals generated in a reaction tank.

The present invention is a wastewater treatment device comprising a sewage tank and sedimentation tank, a collection tank, a reaction tank, and a treatment tank, the waste water having a separator in the water collection tank to remove particulate matter to remove the particulate matter ozone oxidation unit, UV oxidation unit And it is to provide a wastewater treatment apparatus that flows into the reaction tank having a catalyst unit to effectively decompose organic matter in the wastewater through ozone oxidation, ultraviolet oxidation, catalyst adsorption and oxidation process.

Wastewater treatment apparatus according to the present invention

A water collecting tank having a separator for removing particulate matter from an inflowing wastewater and an air injector positioned at the bottom of the separator for preventing the membrane from being blocked;

An inlet for introducing the wastewater from which the particulate matter is removed from the separator of the water collecting tank through a suction pump and an ozone oxidizing unit for oxidizing the organic matter of the inflowing wastewater by inflow of ozone generated through the ozone generator are located at the top of the lower portion of the ozone oxidizing unit. A reaction tank sequentially provided with an ultraviolet oxidation unit having an ultraviolet lamp, and a catalyst unit consisting of a porous catalyst; And

A treatment tank for storing the treated water treated in the reactor;

Characterized in that comprises a.

In addition, the reaction tank of the wastewater treatment apparatus according to the present invention may further include an inlet wastewater injector for injecting wastewater and a treated water injector for spraying the treated water circulated from the storage of the reaction tank at the top of the reactor. .

An air compressor for supplying air to the air injector and the ozone generator, and a circulating pump for supplying the treated water stored in the storage unit to the treated water injector, a process for introducing and storing the treated water stored in the storage unit. A water tank may be further provided.

In another aspect, the present invention provides a wastewater treatment method consisting of the following steps.

Introducing wastewater into the sump by the wastewater inflow pipe;

Removing particulate matter from the introduced wastewater through a separator;

Spraying the wastewater from which the particulate matter is removed into the reaction tank through the inlet wastewater injector by a suction pump;

An organic decomposition step of spraying the waste water through the ozone oxidation unit, the ultraviolet oxidation unit, and the catalyst unit in order to decompose organic substances in the waste water; And

Storing the treated water after the organic decomposition step in the storage unit in the reactor.

In addition, the wastewater treatment method according to the present invention may further include the step of circulating the treated water stored in the storage unit and spraying through the treatment water injector at the top of the reaction tank to further proceed to the decomposition of the organic matter, in this case The organic matter content of the treated water can be further reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the invention to those skilled in the art will fully convey. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, lengths, thicknesses, and the like of layers and regions may be exaggerated for convenience. Like numbers refer to like elements throughout.

Conventional systems of the present invention, as shown in Figure 1, the treated wastewater is treated through an oil separation and sedimentation tank, a collecting tank, and a reaction tank, the treated water is stored in the treatment tank to be used as recycled water. An air supply unit (air compressor) may be connected to the water collection tank, and the air introduced from the air supply unit generates ozone through an ozone generator, and the generated ozone is introduced into the reactor.

An example of a wastewater treatment apparatus according to the present invention is shown in FIG. 2. Wastewater that has undergone oil flow separation and sedimentation tank (not shown) flow rate adjustment, oil water separation and sedimentation is introduced into the sump (30). Separation membrane 31 is provided in the sump, and an air injector is provided at the bottom of the sump, so that air flowing from the air compressor is injected from the bottom of the sump to prevent the membrane from being blocked. Separation membrane 31 installed in the sump (30) is a polyamide (PA), poly sulfate (PS), poly propylene (PP), polyacrylonitrile (PAN), cellulose acetate (CA), cellulose triacetate (CTA), polyethersulfone (PES), Polytetrafluoroethylene (PTFE), polyethersulfone / sulfonated polyethersulfone (PES / SPES), and the like may be used, and hollow fiber PP and PES / SPES composite membranes may be more preferable in terms of membrane performance and economy.

The air generated by the air compressor 41 is divided into a water collecting tank 30 having a separator 31 and an ozone generating unit 42, and the air injector 33 sent to the water collecting tank 30 is located somewhere in the water collecting tank 30. Although it may be installed, in order to prevent the particulate matter of 0.1 μm or more included in the wastewater transferred from the oil-water separation and sedimentation tank to be accumulated in the pores of the membrane 31, air bubbles are sprayed by being installed under the separation membrane 31. Preferably, the air introduced into the ozone generator 42 is sent to the reaction tank 50 by adjusting the ozone generation amount from low concentration to high concentration according to the concentration of molecular organic compounds contained in the inflow wastewater. The ozone generating cell in the ozone generator 42 may be glass, stainless steel, aluminum, copper, polyacryl, etc., but after plasma ceramic coating using stainless steel having high oxidation resistance, ozone was made by a silent discharge type. The size of the ozone generating cell was adjusted according to the required amount.

Waste water from which the particulate matter of 0.1 μm or more was removed from the separator 31 in the water collecting tank 30 by using the suction pump 32 was introduced through the inflow wastewater sprayer 52 at the top of the reaction tank 50. The ozone generated from 42 is introduced into the upper part of the reaction tank in which the inflow wastewater injector 52 is installed and contacted with the wastewater introduced from the inflow wastewater injector to oxidize the organic matter in the inflow wastewater by ozone. As for the material of the reaction tank 50, stainless steel strong in corrosion resistance is suitable. The upper portion of the reaction tank may further include a treatment water injector 53 that circulates from the treatment water storage unit 55 at the bottom of the reaction tank to introduce the treatment water.

Ultraviolet lamp 51 is provided below the inflow wastewater injector 52 and the treated water injector 53 to perform ultraviolet oxidation. The ultraviolet lamp is connected to the ultraviolet lamp control device 57 outside the reactor. The UV lamp 51 in the reactor 50 may use a lamp having a wavelength of 180 nm to 380 nm, and an ultraviolet lamp having a 254 nm dominant wavelength having excellent sterilization effect may be more effectively decomposed in an organic substance. . The ultraviolet lamp 51 may determine whether or not to be installed in the reaction tank 50 according to the characteristics of the influent wastewater and the performance of the separation membrane 31, and when the concentration of molecular organic compounds in the influent wastewater is high, You need to increase the number. The ozone generated by the ozone generator 42 passes through the UV lamp 51 layer to make OH radicals and activators having excellent oxidation power, and decomposes organic compounds contained in the introduced wastewater or treated water, and the injected wastewater is ultraviolet rays. After passing through the UV oxidation unit including the lamp 51, the catalyst is introduced into the catalyst unit 54 and adsorbed to the porous catalyst forming the catalyst unit 54. The excess ozone, OH radicals and activators are adsorbed to the catalyst. Decompose organic matter. Organic substances contained in the waste water are oxidized and decomposed while passing through the ozone oxidation unit and the ultraviolet oxidation unit, and the undecomposed organic substances are filled with a porous catalyst containing compounds such as activated carbon, clay, zeolite, titanium dioxide and iron salt. Adsorbed to 54. The porous catalyst is a catalyst composed of 5-20% by weight of activated carbon, 40-60% by weight of clay, 10-20% by weight of zeolite, 5-10% by weight of titanium dioxide, and 3-8% by weight of iron salt. It is prepared by mixing 5-15% by weight of water with respect to the total weight of the ingredients, and then making a circular shape of 2-7mm and firing at 500-900 ° C. The porous catalyst used in the wastewater treatment apparatus according to the present invention contains activated carbon, clay and zeolite to effectively adsorb organic matter, and the adsorbed organic matter is decomposed by OH radicals and activators and excess ozone activated by an ultraviolet lamp. In addition, since the porous catalyst contains titanium dioxide, when ultraviolet rays are irradiated, active groups such as active oxygen and OH radicals are generated by the photocatalytic action of titanium dioxide, and decompose organic substances to which the active groups are adsorbed.

The injected waste water passes through the ozone oxidation unit, the ultraviolet oxidation unit, and the catalyst unit, and the organic matter in the waste water is effectively decomposed, and the treated water in which the organic matter in the waste water is decomposed is stored in the storage unit 55 in the reactor. In order to process the untreated molecular organic compound in the treated water stored in the storage unit, the ozone oxidation unit, the ultraviolet oxidation unit, and the catalyst unit are re-introduced to the upper portion of the reaction tank through the treatment water injector 53 by using the circulation pump 56. By allowing it to pass again, the removal efficiency of organic substance can be further improved, and the density | concentration of a treated water can be made constant.

Some of the treated water collected in the storage unit 55 in the reactor 50 is sent to the treated water tank 60, and the residual ozone concentration measurement is measured and finally used as recycled water.

Wastewater to be treated according to the present invention includes sewage, industrial wastewater, car wash wastewater, livestock wastewater, industrial water, drinking water, leachate, and the like.

As described above, the present invention provides a membrane / ozone / ultraviolet / catalyst that combines these methods rather than the ozone treatment method, membrane separation method, activated carbon treatment method, and advanced oxidation method that are utilized in the existing wastewater advanced treatment method. As a hybrid advanced treatment technology used, membrane separation removes fine particles, and ozone, OH radicals, and active groups generated by ozone, ultraviolet rays, and catalysts decompose and remove molecular organic compounds, so treated water can be used as recycled water. Less pollution load can be achieved.

The initial investment cost of the treatment facility is similar to that of the existing facility, but since there is no additional chemical input and the catalyst can be used semi-permanently, the maintenance cost is lower than that of the existing facility, thereby reducing the economic burden.

In addition, it is a system that can treat leachate, livestock wastewater, hardly degradable wastewater containing low concentration water treatment and high concentration organic compounds.

The following examples are only intended to illustrate the invention, which is not intended to limit the scope of the invention.

EXAMPLE

Embodiment of the present invention was (as only when wash water inlet) 40 tonnes waste water was test using a car wash Wastewater entering the car wash wastewater to 8m ³ water tank through the oil water separator a day, water tank 20 modules were installed in the ultrafiltration membrane made of polypropylene (PP) made of polypropylene (PP) with a pore size of 0.1-0.2 ㎛, membrane thickness of 40-50um, outer diameter of 360um, and porosity of 40-50%. The wastewater from which the particulate matter was removed by suctioning at a flow rate of 1.5m ³ / hour was introduced into the reactor through an inlet wastewater injector on top of a stainless reactor having a size of 1,000 * 1,000 * 2,300 mm. The ozone generated in an amount of 30 g / hr from the ozone generator having a stainless ceramic non-discharge type ozone generating cell was contacted with the injected wastewater to cause the organic matter to be firstly decomposed by the ozone. Ten UV lamps with 254 nm and 64 W dominant wavelength were installed below the inflow wastewater injector, and the injected wastewater and surplus ozone passed through the UV lamp layer and then filled with a porous catalyst 1,000 * under the UV lamp layer. It passed through the catalyst section measuring 1,000 * 700 mm. The porous catalyst was mixed by adding 100 kg of water to 1000 kg of a catalyst material composed of 15% by weight of activated carbon, 55% by weight of clay, 15% by weight of zeolite, 8% by weight of titanium dioxide, and 7% by weight of iron chloride, and then mixed with a diameter of 2m. It was put in a circular miller and used to prepare a catalyst 3-7mm round and calcined at 700 ℃.

<Table 1>

Suspended matter (SS) and organic compounds contained in the incoming wastewater were rapidly decomposed by ozone, ultraviolet rays, OH radicals and activators while passing through the treatment system, and the results are shown in Table 2 below. In Table 2, COD _Mn represents COD by KMnO ₄ , COD _Cr represents COD value by K ₂ Cr ₂ O ₇ , and ABS is an alkylbenzenesulfonate, which includes a surfactant component included in a detergent when washing. It is shown.

<Table 2>

1 is a schematic view of a wastewater treatment apparatus,

2 is a view showing a wastewater treatment apparatus according to the present invention.

Claims (8)

delete delete delete delete delete delete Introducing wastewater into the sump by the wastewater inflow pipe; Removing particulate matter from the introduced wastewater through a separator; Spraying the wastewater from which the particulate matter is removed into the reaction tank through the inlet wastewater injector by a suction pump; An organic decomposition step of spraying the waste water through the ozone oxidation unit, the ultraviolet oxidation unit, and the catalyst unit in order to decompose organic substances in the waste water; Storing the treated water after the organic decomposition step in a storage unit in the reaction tank; Wastewater treatment method comprising a. The method of claim 7, wherein After circulating the treated water stored in the storage unit and introduced into the reaction tank through the treatment water injector at the top of the reaction vessel, waste water treatment method characterized in that the further step of decomposition of the organic matter.

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