KR101071709B1 - Photo-Fenton oxidation reactor to remove 1,4-dioxane and method to remove 1,4-dioxane by Photo-Fenton oxidation - Google Patents

Abstract

An object of the present invention is to provide a 1,4-dioxane-containing wastewater generated in a polyester manufacturing process and rapidly remove 1,4-dioxane concentration with high efficiency in a Fenton reactor equipped with UV lamps. And 4-dioxane-containing wastewater treatment apparatus and method.

The present invention is a wastewater inlet for introducing a 1,4-dioxane-containing wastewater; A conveying pump and a conveying pipe for conveying the introduced wastewater into and out of the apparatus; UV lamp for ultraviolet irradiation; And it provides a 1,4-dioxane photolysis device by the photo-Fenton oxidation comprising a diffuser for producing fine compressed air.

The present invention also provides a 1,4-dioxane photolysis method by the Fenton oxidation process, wherein the contact of 1,4-dioxane-containing wastewater with Fenton's reagent and ultraviolet rays is generated actively by continuously applying compressed air during the Fenton oxidation process. Simultaneously dissolving oxygen contained in air into the wastewater to increase the production of OH radicals by reaction with divalent iron to promote decomposition of 1,4-dioxane; And simultaneously increasing the contact of the Fenton's reagent with 1,4-dioxane and ultraviolet light in the wastewater by continuously returning the reaction solution to the outside of the reactor and recycling the inside of the reactor. Provided is a dioxane photolysis method.

1,4-dioxane, fenton oxide, polyester

Description

Photo-Fenton oxidation reactor to remove 1,4-dioxane and method to remove 1,4-dioxane by Photo-Fenton oxidation}

The present invention relates to an apparatus and method for removing 1,4-dioxane using airflow circulation and ultraviolet-Fenton oxidation.

More specifically, the present invention is in the manufacturing process of cellulose acetate, ethyl cellulose, benzel cellulose, lacquer, plastic, varnish, paint, dye, resin, oil, fat, wax, grease, polymer vinyl, etc. The present invention relates to an apparatus for effectively treating 1,4-dioxane using Fenton oxidation under ultraviolet irradiation using air aeration and a 1,4-dioxane removal method.

Normally 1,4-dioxane introduced with wastewater is acetaldehyde, ethanol, 1,3-dioxolane, 2-methyl-1,3-dioxolane, 2,3-dihydro-1,4 It exists in mixed with various contaminants such as dioxin, 1,4-dioxane, 2-ethenyl-2-butenal, and COD shows 13000-23000 mg / l, so it is easy to efficiently process 1,4-dioxane. Not.

1,4-dioxane was degassed by activated carbon and air is not removed it is also the contaminants are difficult to handle with conventional biological treatment method according to ^1). According to Stefan and Bolton ¹⁾ , 1,4-dioxane in aqueous solution cannot be efficiently removed by adsorption by activated carbon and air stripping. Because of the high solubility of 1,4-dioxane (Henry's constant: 2.8 × 10 ^-6 atm / m ³ / mol) ³⁾ and the low vapor pressure (30 mmHg at 20 ° C) ^{4 )} . The activated carbon particles are injected into a solution in which an organic solute is present, and then the slurry is stirred or mixed to adsorb the solute when proper contact is made. If the contact time is maintained sufficiently, the solute concentration will decrease from the initial concentration C ₀ to the equilibrium concentration C _e . Usually such equilibrium occurs within 1-4 hours ^2). But recently AOP _S Treatment under aerobic conditions using (Advanced Oxidation Processes) continues to be studied, and UV / H ₂ O ₂ is a field of advanced oxidation. Method By the oxidation process using ultraviolet light has been found to be effective in the removal of recalcitrant organic contaminants found in water-based ^{one, 5,6,7,8).} Parales et al. ^{9 )} used CB 1190 to remove 1,4-dioxane and Stefan and Bolton ¹⁾ decomposed 1,4-dioxane using UV / H ₂ O ₂ . Kelley et al. ^{10 )} also degraded 1,4-dioxane using plants.

Details of the footnotes of each cited document in the above are as follows.

Footnote 1: Stefan, MI, Bolton, JR, "Mechanism of the degradation of 1,4-dioxane in dilute aqueous solution using the UV / hydrogen peroxide process," Environ . Sci . Technol . , 32 , 1588-1595 (1998).

Footnote 2: Yang Byeong-su, "Water and Wastewater", assimilation technology, 188-207 (1998).

Footnote 3: Budavari, S., O'Neil, MJ, Smith, A., Heckelman, PE, Kinneary, JF, "The Merck Index, 12th. Ed.," Merck & Co., Inc .: Whitehouse Station, NJ , (1996).

Footnote 4: Verschueren, K., Handbook of environmental data on organic chemicals, 2nd Ed., Van Northern Reinhold Co., New York, 578-580 (1983).

Footnote 5: McGrane, W., In proceedings of the sixth International symposium on chemical oxidation technology for the nineties, Vanderbilt University: Nashville, TN, (1996).

Footnote 6: Adams, CD, Scanlan, PA, Secrist, ND, "Oxidation and biodegradability enhancement of 1,4-dioxane using hydrogen peroxide and ozone," Environ . Sci . Technol . , 28, 1812-1818 (1994).

Footnote 7: Hill, RR, Jeffs, GE, Roberts, DR, "Photocatalytic degradation of 1,4 dioxane in aqueous solution," Journal of Photochemistry and Photobiology A: Chemistry , 108, 55-58 (1997).

Footnote 8: Maurino, V., Calza, P., Minero, C., Pelizzetti, E., Vincenti, M., “Light-assisted 1,4-dioxane degradation,” Chemosphere , 35 (11), 2675-2688 (1997).

Footnote 9: Parales, RE, Adamus, JE, White, N. & May, HD, "Degradation of 1,4-dioxane by an actinomycete in pure culture," Appl . and Environ. Microbiol , 60, 4527-4530 (1994).

Footnote 10: Kelley, SL, Aitchison, EW, Deshpande, M., Schnoor, JL, Alvarez, PJ, "Biodegradation of 1,4-dioxane in planted and unplanted soil: effect of bioaugmentation with amycolata sp. CB 1190," Wat . Res . 35 (16), 3791-3800 (2001).

In the technique disclosed in Japanese Patent Application Laid-Open No. 2001-029966, 2001-121163 and 2000-202466, only a few hundred mg as a decomposable water treatment method having a low concentration of 1,4-dioxane of 10 ug / L or less There is a problem that it is not applicable to the polyester wastewater treatment amounting to / L.

On the other hand, in Japanese Patent Laid-Open No. 2005-58854, the concentration of organic matter in wastewater containing 1,4-dioxane is biodegraded through biological pretreatment and the concentration is reduced to 1.5 or less than 1,4-dioxane concentration. A device and method for reducing the concentration of 1,4-dioxane by using a separation device and divalent iron, ozone, hydrogen peroxide, UV, and the like in combination. In case of membrane separation, membrane fouling and oxidation during operation causes frequent replacement cycles, excessive cleaning chemicals during membrane cleaning, and shortening of membrane life due to frequent membrane cleaning. In addition, even after such a complicated multi-step process, the concentration of 1,4-dioxane in the final effluent can be treated only up to 0.1 mg / L.

Japanese Laid-Open Patent Publication No. 2005-103401 discloses a method and apparatus for treating 1,4-dioxane-containing wastewater of 50 mg / L or more. In other words, ozone and UV are irradiated to remove the concentration of 1,4-dioxane up to 0.1 mg / L. That is, the first stage is a continuous, two stage using a two-stage 1,4-dioxane decomposer. The stage is designed to treat 1,4-dioxane in a batch configuration. Post-treatment concentrations are reported to be removed to 0.1 mg / L. However, the treatment time is 140 minutes in total, and even UV irradiation takes a long time over 140 minutes and requires close maintenance up to two stages of treatment.

Korean Application No. 10-2005-0027501 describes a method and a device for removing the same through a variety of processes for treating 1,4-dioxane contained in polyester wastewater. In case of 1,4-dioxane, high concentration organic wastewater (COD _Cr 8000-12000) containing 50-1000mg / L concentration range was treated by Fenton oxidation after a series of treatments such as anoxic tank, aeration tank, ultrafiltration membrane, bioreactor and reverse osmosis membrane. Disclosed is a device and method for treating 1,4-dioxane up to 1-60 mg / L after a final treatment. In general, however, the decomposition of hardly decomposable organic substances is used by using highly oxidative treatment alone or in combination of one or two systems, but in the case of the above technology, five or more treatment processes are combined, which requires excessive initial investment and operating costs. There is a disadvantage. On the other hand, the treatment efficiency is very high, 1-4-mg dioxane concentration in the final effluent water, far exceeding the legal acceptance standards promoted by the Ministry of Environment.

As described above, the conventional methods have many problems in terms of economics and technical aspects, and thus have limitations in their application.

MEANS TO SOLVE THE PROBLEM The present inventor made the research in order to solve the above-mentioned all the problems of the conventional method, and based on the result, the present invention is directed to an apparatus and method for treating 1,4-dioxane-containing high concentration organic wastewater. Batch circulating process that induces Fenton reaction by adding hydrogen peroxide and divalent iron salt while injecting compressed air through the diffuser, and accelerates decomposition reaction of 1,4-dioxane by UV irradiation. It is an object of the present invention to provide a 1,4-dioxane photolysis apparatus and a 1,4-dioxane treatment method capable of reducing treatment of dioxane with high efficiency, for example, to 0.01 mg / L or less within a reaction time of 15 minutes.

The present invention for the above purpose is a wastewater inlet for introducing 1,4-dioxane-containing wastewater; A conveying pump and a conveying pipe for conveying the introduced wastewater into and out of the apparatus; UV lamp for ultraviolet irradiation; And it provides a 1,4-dioxane photolysis device comprising an air diffuser for producing fine compressed air.

The 1,4-dioxane photolysis device may further include an H ₂ O ₂ inlet, a FeSO ₄ inlet, and a sampling port.

On the other hand, the present invention is a 1,4-dioxane photolysis method by the Fenton oxidation process, by contacting the 1,4-dioxane-containing waste water, Fenton's reagent and ultraviolet light by continuously applying compressed air during the Fenton oxidation process Actively generating and simultaneously dissolving oxygen contained in the air into the wastewater to increase the production of OH radicals by reaction with divalent iron to promote decomposition of 1,4-dioxane; And simultaneously increasing the contact of the Fenton's reagent with 1,4-dioxane and ultraviolet light in the wastewater by continuously returning the reaction solution to the outside of the reactor and recycling the inside of the reactor. Provided is a dioxane photolysis method.

Compressed air is injected into the wastewater to increase the treatability of the wastewater containing the high concentration hardly decomposable COD, and iron salt and hydrogen peroxide solution are injected at an appropriate ratio under ultraviolet irradiation to induce Fenton oxidation to oxidatively decompose 1,4-dioxane. 1,4-dioxane in the wastewater treated in this way shows removal efficiency up to 100%. To treat wastewater containing 1,4-dioxane containing high concentrations of hardly decomposable organic substances, dihydric iron salts and hydrogen peroxide while maintaining the pH at acidity (pH 2-3) while supplying air at a constant flow rate to an external and closed reactor Water (35%) is injected at a constant rate to treat 1,4-dioxane in the wastewater with high efficiency. At this time, the reaction solution supported in the reaction tank increases the chance of contact with the ultraviolet rays generated by the ultraviolet lamp continuously at a constant flow rate by the circulation conveying pump, thereby oxidizing 1,4-dioxane by the generation of OH radicals generated by ultraviolet irradiation. Decomposition is also accelerated at the same time.

Compressed air circulation type 1,4-dioxane advanced treatment apparatus and 1,4-dioxane advanced treatment method according to the present invention is 1,4-dioxane and acetaldehyde, ethanol, 1,3-dioxolane, 2 To decompose highly decomposable organic substances such as -methyl-1,3-dioxolane, 2,3-dihydro-1,4-dioxin, 1,4-dioxane, 2-ethenyl-2-butenal with high efficiency During the Fenton oxidation process, compressed air was continuously applied to actively generate contact between organic substances and ultraviolet rays in the wastewater, thereby promoting the decomposition of 1,4-dioxane and increasing the contact between divalent iron and hydrogen peroxide. Promote the production to increase the oxidation efficiency of 1,4-dioxane. In addition, oxygen contained in the air is also dissolved in the waste water, thereby increasing the generation of OH radicals by reaction with divalent iron, further increasing the resolution of 1,4-dioxane.

The 1,4-dioxane photolysis apparatus and the 1,4-dioxane photolysis method according to the present invention can preferably treat the 1,4-dioxane treatment concentration in the wastewater to 0.01 ppm or less within 15 minutes of the start of the wastewater treatment.

The 1,4-dioxane-containing wastewater which can be removed by the aeration type photo-Fenton oxidation in the present invention includes various industrial wastewaters containing 200-1,000 mg / l of 1,4-dioxane. Waste water containing 4-dioxane typically contains 13,000 to 23,000 mg / l of COD _Cr contaminants.

In a preferred embodiment, the UV lamp for ultraviolet irradiation in the 1,4-dioxane photolysis device is preferably a hanging top attachment UV lamp. Preferred UV lamps used in the present invention have a length of 845 mm, a diameter of 15 mm, a power of 80 W and UV intensity of 12 mW / cm ² to be. Two UV lamps per 1 ton of 1,4-dioxane-containing wastewater are installed vertically inside a reactor with a diameter of 22 mm in diameter and 1,000 mm in length, and are irradiated horizontally into the waste water during the Fenton reaction. As the Fenton reagent and air bubbles collide actively inside the reactor, the decomposition of 1,4-dioxane is promoted, thereby promoting the photolysis of 1,4-dioxane by continuous transmission of UV.

Further, in a preferred embodiment, the diffuser producing the fine compressed air in the 1,4-dioxane photolysis device is preferably a two stage rod diffuser. In the present invention, the diffuser, which is a compressed air distribution device supplied into the reactor, is preferably made of a double rod porous porous acid-resistant ceramic material, and has a standard airflow of 60-120 L / min, porosity of 25-35%, The pore diameter is 60 um, the oxygen absorption efficiency is 29.2%, the depth of use is 5m and the ventilation resistance is made of 140mmH ₂ O. As such, during the Fenton reaction in the reactor, the pentene reagent and the 1,4-dioxane and the COD-inducing substance are actively contacted at the same time and contribute to the generation of additional OH radicals, thereby enhancing the oxidative decomposition of the 1,4-dioxane. .

Furthermore, the present invention provides a 1,4-dioxane photolysis apparatus which is a batch compressed air circulation type 1,4-dioxane treatment apparatus comprising the following components.

A reservoir for storing 1,4-dioxane wastewater;

A pump for transferring and circulating the stored wastewater to the photooxidation reactor;

A compressed air generator for promoting internal oxidation of the reaction liquid in the reactor;

An air diffuser for supplying air generated from the compressed air generator evenly inside the reactor;

Reactor for Fenton decomposition reaction according to the injection of divalent iron and hydrogen peroxide water;

UV lamps to promote Fenton oxidation; And

Quartz tube for promoting oxidative decomposition reaction of 1,4-dioxane by transmitting only ultraviolet light of specific wavelength from ultraviolet lamp

According to the 1,4-dioxane photolysis apparatus and the 1,4-dioxane removal method according to the present invention, decomposition of 1,4-dioxane is promoted by induction of the Fenton reaction and UV irradiation, such as 1,4- within 15 minutes of reaction time. Dioxane concentrations can be treated up to 0.01 mg / L.

That is, the present invention promotes the reaction with Fenton's reagent and the high concentration organic wastewater containing 1,4-dioxane under UV irradiation, and simultaneously returns the reaction liquid to the outside of the reactor and recycles the reactor to the inside of the reactor. Increased contact with contaminants and ultraviolet light in the wastewater, effectively reducing the concentration of 1,4-dioxane to less than or equal to 0.01 ppm below the limit of detection concentration within 15 minutes of the reaction, effectively treating 1,4-dioxane in high concentration organic wastewater. It is a compact economic apparatus and method that can be used, and has the effect of treating wastewater quickly.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a plan view of a 1,4-dioxane photooxidation decomposition apparatus according to the present invention. As illustrated in FIG. 1, the photocatalytic decomposition device according to the present invention includes an inlet port 1 for supplying a high concentration of organic wastewater containing 1,4-dioxane to a reaction tank; An inlet (2) of H ₂ O ₂ used for the Fenton reaction of the wastewater introduced; Similarly, infusion tube 3 of FeSO ₄ used in the Fenton reaction; UV lamps (4) spaced apart at regular intervals; Sampling wells for periodic sampling over reaction time (5); In order to promote the reaction, the reaction liquid is circulated through the inner conveying pipe 6 at a constant flow rate.

On the other hand, through the rod-shaped diffuser 7 mounted on the bottom of the reactor to promote the OH radical generation reaction, fine air bubbles having a diameter of 60 μm or less are aerated into the reactor at a flow rate of 2-4 l / min.

That is, a high concentration of organic wastewater containing 1,4-dioxane is introduced into the photooxidation device through the inlet port 1, and the introduced wastewater is discharged at a constant rate through the H ₂ O ₂ supply part 2 and the FeSO ₄ supply part 3. It is introduced into the reactor at a concentration to generate a Fenton reaction under the irradiation of the UV lamp (4) and periodically sampled through the sampling well (5) to evaluate the treatment efficiency according to the reaction time.

At the same time, the reaction liquid is returned at a constant flow rate through the internal return pipe 6 in order to improve contact between the wastewater and the Fenton reagent. Through this process, the contact between the reaction solution and the ultraviolet ray is also enhanced to increase the treatment efficiency. Meanwhile, in order to enhance the OH production reaction between divalent iron and hydrogen peroxide solution, micro air bubbles having a diameter of 60 μm or less are formed through the rod-shaped diffuser 7 at a flow rate of 2-4 l / min. To feed into the reactor.

Figure 2 is a schematic view showing a front view of the 1,4-dioxane photooxidation decomposition apparatus according to the present invention. That is, the wastewater injected into the reactor at a constant flow rate through the wastewater inlet 1 is mixed with Fenton's reagent by the compressed air supplied at a constant flow rate and at the same time promotes the OH radical generating reaction. Photolysis of 1,4-dioxane is also induced by irradiation of ultraviolet rays generated in the UV lamp 4 during this reaction. On the other hand, the wastewater to be treated is continuously circulated from the lower outlet portion 9 to the upper inlet portion 10 through the conveying pump 8 in the upstream of the reaction tank. This process increases the exposure time of wastewater, Fenton's reagent, and ultraviolet light to increase the removal of 1,4-dioxane from the wastewater.

3 is a schematic view showing a UV lamp holder according to the present invention. Preferably, the UV lamp is installed inside the quartz tube and the upper and lower portions of the quartz tube are sealed using an acid-resistant consolidation material to prevent oxidation by the strongly acidic reaction solution. In addition, the upper portion penetrates the lid of the hermetic reactor by using a quartz tube holder (FIG. 3) connected to the upper and lower portions of the quartz tube using acid resistant synthetic resin to position the quartz tube in the upper predetermined range from the tank bottom. To fix it.

Example

Wastewater was injected into the reactor according to the invention after stabilizing pH, DO, temperature. Polymerization wastewater was colorless before Fenton's reagent injection, but turned brown when iron (II) sulfate was injected. At this time, bubbles are generated during the reaction.

Example  One

Figure 4 shows the concentration change in the treated water of 1,4-dioxane for each reaction time in the photochemical process of the H synthesis company. The concentration of 1,4-dioxane in the polymerization wastewater was 380-450 ppm and the concentration of COD _Cr was 28,000-30,000 mg / l. A reaction precipitate formed after the reaction, and no obvious color change was observed. The injection amounts of hydrogen peroxide and iron (II) fenton reagent were 100: 100, 100: 200, 200: 200, and 200: 300 ppm. That is, as the concentration of Fenton's reagent increased, the concentration of 1,4-dioxane in the treated water decreased, and the lowest concentration of 1,4-dioxane was 0.05 ppm at 15 minutes after the start of the reaction at a ratio of 200: 300.

Example  2

Figure 5 shows the results of the photolysis of the S synthesis company. The concentration of 1,4-dioxane ranged from 350 to 420 ppm and the concentration of COD _Cr was 13,000-15,000 mg / l. The injection amounts of hydrogen peroxide and iron (II) sulfate were 100: 100, 100: 200, 200: 200, and 200: 300 ppm.

In the case of the S-synthesis company, 1,4-dioxane in the treated water was found to be below the detection concentration limit (less than 0.01 ppm) within 15 minutes of the reaction when reacted at a ratio of 100: 200, showing the highest treatment efficiency.

1 is a schematic plan view of a 1,4-dioxane treatment apparatus according to the present invention;

2 is a schematic front view of a 1,4-dioxane treatment apparatus according to the present invention;

3 is a schematic view showing a UV lamp holder according to the present invention;

4 is a graph showing the test results of the first embodiment according to the present invention; And

5 is a graph showing the test results of the second embodiment according to the present invention.

<Description of the symbols for the main parts of the drawings>

1 Waste water inlet 2 H ₂ O ₂ Inlet

3 FeSO ₄ Inlet 4 UV Lamp

5 Sample Collection 6 Internal Return Pipe

7 double rod diffuser 8 conveying pump

9 Lower outlet 10 Upper inlet

Claims (14)

1,4-dioxane photolysis apparatus by photo-Fenton oxidation, A wastewater inlet 1 for introducing 1,4-dioxane containing wastewater; A conveying pump and conveying pipe (8) for conveying the introduced wastewater into and out of the apparatus; UV lamp for ultraviolet irradiation (4); And A two stage rod diffuser 7 which produces fine compressed air; 1,4-dioxane photolysis device by photo-Fenton oxidation comprising a The method of claim 1, The 1,4-dioxane photolysis device further comprises 1,4-dioxane by photo-Fenton oxidation, characterized in that it further comprises a H ₂ O ₂ inlet (2), FeSO ₄ inlet (3) and the sample collection port (5) Photolysis device. 3. The method of claim 2, The pH in the device is maintained at an acidic pH of 2 to 3, characterized in that through the H ₂ O ₂ inlet (2), FeSO ₄ inlet is injected with divalent iron salt FeSO ₄ and hydrogen peroxide (35% by weight of hydrogen peroxide in the total) 1,4-dioxane photolysis apparatus by photo-Fenton oxidation. The method of claim 1, The 1,4-dioxane-containing wastewater is an industrial wastewater containing 200-1,000 mg / l of 1,4-dioxane. The method of claim 1, The 1,4-dioxane photolysis device by photo-fenton oxidation, wherein the 1,4-dioxane-containing wastewater is an industrial wastewater containing 13,000 to 23,000 mg / l of COD _Cr contaminants. The method of claim 1, 1,4-dioxane photolysis device by photo-Fenton oxidation, characterized in that the UV lamp (4) for the ultraviolet irradiation is a suspended top-attached UV lamp. The method of claim 6, UV lamp (4) for the ultraviolet irradiation is 845mm in length, 15mm in diameter, power is 80W, UV intensity is 12mW / cm ² 2 to 1 to 1,4-dioxane-containing wastewater, which is installed inside a reactor with a diameter of 22 mm and a diameter of 1,000 mm in length, vertically inside the reactor, is irradiated horizontally into the wastewater during the Fenton reaction. 1,4-dioxane photolysis device. delete The method of claim 1, The diffuser 7 for producing fine compressed air is made of a double rod-type porous acid-resistant ceramic material and has a standard air flow rate of 60-120 L / min, porosity of 25-35%, pore diameter of 60 um, 1,4-dioxane photolysis device by photo-Fenton oxidation, characterized in that the oxygen absorption efficiency is 29.2%, the use depth is 5m and the ventilation resistance is 140mmH ₂ O. The method of claim 1, The diffuser 7 for producing fine compressed air is mounted on the bottom of the reactor to aeration of fine air bubbles having a diameter of 60 μm or less into the reactor at a flow rate of 2-4 l / min. 1,4-dioxane photolysis device. 1,4-dioxane photolysis apparatus by photo-Fenton oxidation, A reservoir for storing 1,4-dioxane wastewater; A pump for transferring and circulating the stored wastewater to the photooxidation reactor; A compressed air generator for promoting internal oxidation of the reaction liquid in the reactor; An air diffuser for supplying air generated from the compressed air generator evenly inside the reactor; Reactor for Fenton decomposition reaction according to the injection of divalent iron and hydrogen peroxide water; UV lamps to promote Fenton oxidation; And Quartz tube for promoting oxidative decomposition reaction of 1,4-dioxane by transmitting only ultraviolet light of specific wavelength from ultraviolet lamp 1,4-dioxane photolysis device by photo-Fenton oxidation comprising a. The method according to any one of claims 1 to 7, and 9 to 11, Wherein said device is capable of treating 1,4-dioxane treatment concentration in wastewater to less than 0.01 ppm within 15 minutes of the start of the reaction. Using a 1,4-dioxane photolysis apparatus by photo-Fenton oxidation according to any one of claims 1 to 7, By continuously applying compressed air during the Fenton oxidation process, active contact between 1,4-dioxane-containing wastewater, Fenton's reagent and ultraviolet light is generated. At the same time, oxygen contained in air is dissolved into the wastewater, Increasing the production of OH radicals by reaction to promote decomposition of 1,4-dioxane; And At the same time, 1,4-dioxane by photo-Fenton oxidation, comprising the step of continuously returning the reaction solution to the outside of the reactor and recycle to the inside of the reactor to increase the contact of Fenton's reagent with 1,4-dioxane and ultraviolet in wastewater Photolysis method. In the 1,4-dioxane photolysis method by the Fenton oxidation process, By continuously applying compressed air during the Fenton oxidation process, active contact between 1,4-dioxane-containing wastewater, Fenton's reagent and ultraviolet light is generated. At the same time, oxygen contained in air is dissolved into the wastewater, Increasing the production of OH radicals by reaction to promote decomposition of 1,4-dioxane; And At the same time, 1,4-dioxane by photo-Fenton oxidation comprising the step of continuously returning the reaction liquid to the outside of the reactor and recycling to the inside of the reactor to increase the contact of Fenton's reagent with 1,4-dioxane and ultraviolet light in the wastewater. Photolysis method.

Images