KR101007564B1 - Equipment and method for potable water treatment using catalytic dynamic membrane - Google Patents

Abstract

The present invention relates to an apparatus and method for treating water using a catalytic dynamic membrane, comprising: an integrated water treatment apparatus for removing trace contaminants and particulate contaminants present in influent water by combining a catalytic oxidation process and a low pressure membrane filtration process; It is about a method. Water purification apparatus using a catalytic dynamic membrane according to the present invention is raw water supply means for supplying raw water; Membrane filtration means for removing organic contaminants and particulate contaminants in the raw water received from the raw water supply means; Chemical supply means for supplying chemicals to the membrane filtration means; Treated water discharge means for discharging the treated water from the membrane filtration means; Concentrated water discharge means for discharging the concentrated raw water after discharge of the treated water; And aeration means for providing air to the membrane filtration means.

Endocrine disruptors, particulate contaminants, oxidation catalyst particles, dynamic membranes

Description

Water treatment system and method using catalytic dynamic membrane {EQUIPMENT AND METHOD FOR POTABLE WATER TREATMENT USING CATALYTIC DYNAMIC MEMBRANE}

The present invention relates to a water treatment apparatus and method using a catalytic dynamic membrane. Specifically, the present invention is to remove trace contaminants such as endocrine disruptors, pharmaceuticals and particulate contaminants such as colloids, bacteria, etc. in a water treatment facility, combined with a catalytic oxidation process and a low pressure membrane filtration process An integrated water treatment apparatus and method for removing trace contaminants and particulate contaminants present in raw water.

In addition, the present invention relates to a nanocatalyst for decomposing endocrine disruptors and pharmaceuticals contained in water, and more particularly, by forming a nanostructure between the transition metal-tetraphthalocyanine-based compound and the support It is a heterogeneous catalyst which is used as a catalyst in the decomposition reaction of endocrine disrupting substances and pharmaceuticals using hydrogen peroxide as an oxidant, and has a high reaction activity and a nano catalyst which enables selective decomposition of organic substances having a benzene ring. It is about.

Endocrine Disrupting Chemicals (EDCs) are substances that interfere with the normal functioning of the endocrine system. They are called environmental hormones because they enter the body and act like hormones. The endocrine system obstacles raise the awareness that the reproductive function of the ecosystem and humans, malformations, growth disorders, cancer, etc. can pose a threat to all species, such as ozone layer destruction, global warming, etc. It is a problem. Pharmaceutically active compounds (PHACs) are known to have potential toxic effects on the ecosystem and the human body as substances that have medicinal activity. In particular, with the rapid development of the pharmaceutical industry, the types and amounts of pharmaceutical substances flowing into the natural world are increasing dramatically.

Most substances classified as endocrine disruptors and pharmaceuticals are chemically stable in their structure and are concentrated in the body continuously without being easily degraded in nature. Therefore, humans at the end of the consumer's position in the ecosystem will consume foods that have already been enriched and ultimately concentrated in the human body to cause health risks such as cancer or reproductive dysfunction. Will result. Many compounds known to cause endocrine disruption are materials that are used in a relatively large amount in the actual industry, and their range of use is also enormous, which is difficult to fundamentally reduce the use or finally prohibit production. Therefore, the fundamental management and harmless technology for this is urgently required.

Various methods have been tried to remove endocrine obstructions and medicinal substances in aquatic systems, but existing techniques do not provide a fundamental solution. Nanofiltration, a membrane filtration process, has been of particular interest in recent years and is effective in treating endocrine disruptors and pharmaceuticals because it can exclude substances having a molecular weight of 200 to 400 Da or more. However, due to the nature of the nanofiltration process, which is based on physical filtration, endocrine obstructions excluded by the nanomembrane are not decomposed but continuously concentrated. In addition, nanofiltration processes have very limited coverage due to cost concerns. Adsorption processes with activated carbon have been used relatively early to remove trace organics. Many studies have been attempted to remove endocrine obstructions or pharmaceutical substances in water by treating with granular activated carbon immediately before disinfection step or by adding powdered activated carbon with flocculation. However, treatment with activated carbon is not a fundamental treatment because it is simply physically removed. In addition, considering that the main cause of endocrine obstructions and pharmaceuticals is urban sewage or industrial wastewater, activated carbon adsorption is limited to water treatment.

Therefore, in recent years, research has been conducted at home and abroad to artificially decompose endocrine barriers through chemical oxidation as well as physical treatment of endocrine barriers and weak substances. These processes, called the Advanced Oxidation Process (AOP), are the ideal treatment in terms of fundamental removal of hazardous substances. However, ozone reaction or UV / H2O photolysis is relatively expensive process, Fenton process causes the problem of iron sludge generation, homogeneous catalytic process is difficult to separate reaction product and catalyst, catalyst deactivation occurs quickly, pH Has a disadvantage in that the reaction occurs only under acidic conditions of 4 or less.

In addition, in the water treatment process, not only trace pollutants but also particulate pollutants must be removed at the same time to supply high quality drinking water. Particulate matter includes suspended solids, colloids, bacteria, pathogenic protozoa, etc., and must be removed during the purification process because it can have a harmful effect on the human body. Water quality standards for particulate matter are usually expressed in turbidity, and treatment turbidity of less than 0.1 NTU is recommended to maintain high treatment efficiency for pathogenic protozoa. Therefore, a low pressure membrane filtration process for meeting these requirements has recently attracted attention. However, when the low pressure membrane filtration process is introduced, there is a problem in that the productivity of the membrane is continuously reduced due to the problem of membrane contamination caused by organic substances, and thus a technique for solving the problem is required.

Therefore, in view of the above-mentioned problems, the present invention can not only decompose endocrine obstructions or pharmaceutical substances in the membrane filtration process by forming a dynamic membrane on the surface of the low pressure membrane module using catalyst particles using hydrogen peroxide as an oxidizing agent. In addition, the filtration function of the membrane module can be used to remove floating contaminants such as bacteria with high efficiency, and at the same time, to form a protective layer on the surface of the membrane module to prevent irreversible contamination of the membrane module. The purpose is to provide a processing device.

Water purification apparatus using a catalytic dynamic membrane according to the present invention is raw water supply means for supplying raw water; Membrane filtration means for removing organic contaminants and particulate contaminants in the raw water received from the raw water supply means; Chemical supply means for supplying chemicals to the membrane filtration means; Treated water discharging means for discharging the treated water from the membrane filtration means; Concentrated water discharge means for discharging the concentrated raw water after discharge of the treated water; And aeration means for providing air to the membrane filtration means.

The raw water supply means includes a raw water supply unit for collecting and supplying raw water and a raw water supply pump for introducing raw water into the membrane filtration means from the raw water supply unit.

The medicine supply means includes a medicine storage tank in which the medicine is stored and a medicine supply pump for introducing the medicine from the medicine storage tank into the membrane filtration means, and the medicine may be hydrogen peroxide as an oxidizing agent.

The membrane filtration means includes a membrane reaction tank in which raw water is introduced and treated, a membrane module positioned in the membrane reaction tank to filter the introduced raw water, and an oxidation catalyst particle reacting with the membrane module.

The treated water discharge means is a treated water valve for opening and closing the discharge of the treated water from the membrane filtration means, a pressure reducing pump located downstream of the treated water valve, located upstream of the treated water valve to reverse the flow of fluid. And a backwash valve, a backwash pump, and a treated water storage tank for storing the treated water.

The concentrated water discharge means includes a concentrated water valve for opening and closing the discharge of the concentrated water after the discharge of the treated water treated by the membrane filtration means, a concentrated water storage tank for storing the concentrated water discharged from the concentrated water valve, and the concentrated water It includes a partition provided on one side in the membrane reaction tank to prevent the oxidation catalyst particles from moving to the valve.

The aeration means includes a diffuser and a compressor for providing air in the membrane reaction tank.

The oxidation catalyst particles are formed by adsorbing tetraphthalocyanine molecules combined with iron to a spherical or powdered anion exchange resin having a size between 0.05 mm and 1 mm.

In the membrane module, the oxidation catalyst particles are deposited on the surface of the membrane module by the decompression pump to form a dynamic membrane, and during the filtration process, hydrogen peroxide is used as the oxidant by the dynamic membrane to decompose contaminants in raw water by oxidation. do.

The dynamic membrane may be formed on the surface of the membrane module to prevent the membrane module from being contaminated.

In the dynamic membrane, the oxidation catalyst particles are formed on the surface of the membrane module in the filtration process, and the oxidation catalyst particles are separated from the surface of the membrane module by the aeration means in the backwashing process by the backwash valve and the backwash pump. By repeating, the filtering function can be maintained continuously.

The pollutant may be a material having a benzene ring, water-soluble, molecular weight of 1,000 Da or less, pKa 4-10, pKow 0.5-3.5.

Water treatment method using the catalytic dynamic membrane according to the present invention raw water is introduced into the membrane filtration means by the raw water supply means; An oxide catalyst particle is deposited on the surface of the membrane module in the membrane filtration means to form a dynamic membrane; Decomposing organic contaminants and particulate contaminants in raw water by an oxidation reaction using hydrogen peroxide introduced into the membrane filtration means as an oxidant; Discharging the treated water and the untreated concentrated water by the membrane filtration means; In the membrane filtration means, the oxidation membrane is separated from the surface of the membrane module by the aeration means in the backwashing process by the backwash valve and the backwash pump; This includes repeating all the above steps continuously.

As described above, the apparatus and method for treating water by the catalytic dynamic membrane according to the present invention can not only continuously remove a small amount of organic contaminants and particulate contaminants in one apparatus, but also integrate a multi-step process. It has high field applicability and has an effect of preventing membrane module contamination.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects, features and advantages will become more apparent through the following examples in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a water purification apparatus using a catalytic dynamic membrane according to the present invention, Figure 2 is a view showing a process of forming a dynamic membrane in the membrane module according to the present invention, Figure 3 is a dynamic according to the present invention A perspective view showing the membrane in detail.

As shown in Figures 1 to 3, the purified water treatment apparatus using the catalyst dynamic membrane according to an embodiment of the present invention comprises a raw water supply means 100 for supplying raw water; Membrane filtration means (300) for removing organic contaminants and particulate contaminants in the raw water received from the raw water supply means (100); Chemical supply means for supplying the chemical to the membrane filtration means 300; Treatment water discharge means 500 for discharging the treated water from the membrane filtration means 300; Concentrated water discharge means 400 for discharging the concentrated raw water after the discharge of the treated water; And aeration means 600 for providing air to the membrane filtration means 300.

Here, the trace amount of the pollutant may be a material having a benzene ring, water-soluble, molecular weight of 1,000 Da or less, pKa 4-10, pKow 0.5-3.5.

The raw water supply means 100 is a raw water supply unit 110 for collecting and supplying raw water and a raw water supply pump 110 for introducing raw water from the raw water supply unit 130 to the membrane reaction tank 330 through the supply pipe 120. It includes, The drug supply means 200 includes a drug supply tank 220 for introducing the drug storage tank 210 and the drug storage tank 210 to the membrane reaction tank 330 in which the drug is stored, The drug may be hydrogen peroxide, which is an oxidizing agent, but is not limited thereto and may be another drug.

The membrane filtration means 300 is a membrane reaction tank 330 in which raw water is introduced and processed, a membrane module 310 positioned in the membrane reaction tank 330 to filter the introduced raw water, and an oxidation catalyst reacting with the membrane module. Particles 320, the oxidation catalyst particles 320 adsorbs tetrasulfophthalocyanine molecules combined with iron to the spherical or powdered anion exchange resin having a size of 0.05 mm ~ 1 mm To form.

As shown in FIG. 2 (a), in the membrane module 310, the oxidation catalyst particles 320 are deposited on the surface of the membrane module 310 by the pressure reducing pump 510 to form the dynamic membrane 350. 3, the contaminants in the raw water are decomposed by the oxidation reaction using hydrogen peroxide as the oxidant by the dynamic membrane 350 in the filtration process.

Since the dynamic membrane 350 is formed on the surface of the membrane module 310 to filter organic matter or colloidal material that may contaminate the membrane module, the membrane module 310 is contaminated (non-reversible contamination). Can be prevented.

The treatment water discharge means 500 is a treatment water valve 530 for opening and closing the discharge of the treated water from the dynamic membrane 350, a pressure reducing pump 510 located downstream of the treatment water valve 530, A backwash valve 540 and a backwash pump 520 positioned upstream of the treated water valve 530 to reverse the flow of the fluid, and a treated water storage tank 540 for storing the treated water.

The concentrated water discharge means 400 is a concentrated water valve 420 for opening and closing the discharge of the concentrated water after the discharge of the treated water treated by the dynamic membrane 350, the concentrated water discharged from the concentrated water valve 420 Concentrated water storage tank for storing the 430, and is provided on one side (for example, the concentrated water valve side) in the membrane reaction tank 330 to prevent the oxidation catalyst particles 320 to move to the concentrated water valve The partition 410 is included.

The aeration means 600 is to provide air in the membrane reaction tank 330, in the dynamic membrane formed in the membrane module 310, the acid to shake off the oxidation catalyst particles from the membrane module 310 Engine 620 and compressor 610.

As shown in FIGS. 2 and 3, the dynamic membrane 350 has the oxidation catalyst particles 320 formed on the surface of the membrane module 310 during filtration, and the backwash valve 540 and the backwash pump 520. By repeating the process of separating the oxidation catalyst particles 320 from the surface of the membrane module 310 by the aeration means 600 in the backwash process by) it is possible to continuously maintain the filtration function.

Hereinafter, the operation and operation of the water treatment device according to an embodiment of the present invention will be described in detail.

As shown in FIG. 1, first, raw water is collected by the raw water supply unit 130 and is introduced into the membrane reaction tank 330 through the supply pipe 120 in the purified water treatment device by a weight input of the raw water supply pump 110.

The raw water stays in the membrane reaction tank 330 for a certain residence time, and in this process, the oxidation catalyst particles 320 in the membrane reaction tank 330 and the chemical supply pump 220 are automatically supplied from the chemical storage tank 210. Hydrogen peroxide, a chemical injected into the plant, decomposes trace organic contaminants present in the raw water. At this time, the oxidation catalyst particles 320 is a dynamic membrane 350 (see FIG. 3) on the surface of the membrane module 310 as shown in FIG. 2 by a drag force provided by the decompression pump 510. ).

Accordingly, the catalytic oxidation reaction does not occur in the membrane reactor 330 but occurs in the dynamic membrane 350 layer formed on the surface of the membrane module 310. In addition, the dynamic membrane 350 serves to filter organic matter or colloidal material that may contaminate the membrane module 310, thereby preventing contamination of the membrane module. Since the filtration by the membrane module 310 proceeds simultaneously with the reaction, the particulate matter in the raw water is also removed and the treated water is continuously produced.

After a certain time of reaction, the pressure reducing pump 510 is stopped and the treated water valve 530 is closed, and the backwash valve 540 is operated so that the backwash valve 540 is opened so that the fluid flowing in the membrane module 310 is opened. The direction of is reversed. At the same time, the compressor 610 is operated to provide air from the diffuser 620 positioned at the bottom of the membrane reactor 330 to shake off the membrane module 310. Accordingly, as shown in FIG. 2B, the dynamic membrane 350 formed on the surface of the membrane module 310 is separated and floated as the oxidation catalyst particles 320. Thereafter, after stopping the compressor 610 to induce precipitation of the oxidation catalyst particles 320, the concentrated water is transferred to the concentrated water treatment tank 430 via the concentrated water valve 420. At this time, the membrane reaction tank ( The partition wall 410 located at one side in the 330 is installed to prevent the oxidation catalyst particles 320 from moving toward the brine valve 420.

As the above process is repeated, the dynamic membrane 350 is continuously formed and separated on the surface of the membrane module 310, thereby continuously removing the trace organic contaminants and particulate contaminants present in the raw water. can do.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is an overall configuration diagram of a water treatment apparatus using a catalytic dynamic membrane according to the present invention.

2 is a view showing a process of forming a dynamic membrane in the membrane module according to the present invention.

3 is a perspective view specifically showing a dynamic membrane according to the present invention.

* Description of the symbols for the main parts of the drawings *

110: raw water supply pump 130: raw water supply

210: chemical reservoir 220: chemical supply pump

310: membrane module 320: oxidation catalyst particles

330: membrane reactor 350: dynamic membrane

420: concentrated water valve 510: pressure reducing pump

520: backwash pump 530: treated water valve

540: backwash valve 620: diffuser

Claims (14)

Raw water supply means for supplying raw water; Membrane filtration means for removing organic contaminants and particulate contaminants in the raw water received from the raw water supply means; Chemical supply means for supplying chemicals to the membrane filtration means; Treated water discharge means for discharging the treated water from the membrane filtration means; Concentrated water discharge means for discharging the concentrated raw water after discharge of the treated water; And Aeration means for providing air to said membrane filtration means, The treated water discharge means is a treated water valve for opening and closing the discharge of the treated water from the membrane filtration means, a pressure reducing pump located downstream of the treated water valve, located upstream of the treated water valve to reverse the flow of fluid. To include a backwash valve and backwash pump to store, and a treated water storage tank for storing the treated water Water treatment system using catalytic dynamic membrane. The method of claim 1, The raw water supply means includes a raw water supply unit for collecting and supplying the raw water and a raw water supply pump for introducing the raw water into the membrane filtration means from the raw water supply unit Water treatment system using catalytic dynamic membrane. The method of claim 2, The chemical supply means includes a chemical storage tank in which the chemical is stored and a chemical supply pump for introducing the chemical from the chemical storage tank into the membrane filtration means, wherein the chemical agent is hydrogen peroxide as an oxidant. Water treatment system using catalytic dynamic membrane. The method of claim 3, The membrane filtration means includes a membrane reaction tank in which raw water is introduced and treated, a membrane module positioned in the membrane reaction tank to filter the introduced raw water, and an oxidation catalyst particle reacting with the membrane module. Water treatment system using catalytic dynamic membrane. delete The method of claim 1, The concentrated water discharge means includes a concentrated water valve for opening and closing the discharge of the concentrated water after the discharge of the treated water treated by the membrane filtration means, a concentrated water storage tank for storing the concentrated water discharged from the concentrated water valve, and the concentrated water Comprising a partition provided on one side in the membrane reaction tank to prevent the oxidation catalyst particles from moving to the valve Water treatment system using catalytic dynamic membrane. The method of claim 6, The aeration means includes a diffuser and a compressor for providing air in the membrane reaction tank. Water treatment system using catalytic dynamic membrane. The method of claim 4, wherein The oxidation catalyst particles are formed by adsorbing tetraphthalocyanine molecules combined with iron to a spherical or powdered anion exchange resin having a size between 0.05 mm and 1 mm. Water treatment system using catalytic dynamic membrane. The method of claim 4, wherein In the membrane module, the oxidation catalyst particles are deposited on the surface of the membrane module by the decompression pump to form a dynamic membrane, and during the filtration process, hydrogen peroxide is used as the oxidant by the dynamic membrane to decompose contaminants in raw water by oxidation. doing Water treatment system using catalytic dynamic membrane. 10. The method of claim 9, The dynamic membrane is formed on the surface of the membrane module to prevent the membrane module from being contaminated Water treatment system using catalytic dynamic membrane. The method of claim 10, In the dynamic membrane, the oxidation catalyst particles are formed on the surface of the membrane module in the filtration process, and the oxidation catalyst particles are separated from the surface of the membrane module by the aeration means in the backwashing process by the backwash valve and the backwash pump. To keep the filtration function Water treatment system using catalytic dynamic membrane. The method of claim 1, The pollutant has a benzene ring and is water soluble, has a molecular weight of 1,000 Da or less, and has a property between pKa 4-10 and pKow 0.5-3.5. Water treatment system using catalytic dynamic membrane. Raw water is introduced into the membrane filtration means by the raw water supply means; An oxide catalyst particle is deposited on the surface of the membrane module in the membrane filtration means to form a dynamic membrane; Decomposing organic contaminants and particulate contaminants in raw water by an oxidation reaction using hydrogen peroxide introduced into the membrane filtration means as an oxidant; Discharging the treated water and the untreated concentrated water by the membrane filtration means; In the membrane filtration means, the oxidation membrane is separated from the surface of the membrane module by the aeration means in the backwashing process by the backwash valve and the backwash pump; To repeat all of the above Water treatment method using catalytic dynamic membrane. The method of claim 13, The oxidation catalyst particles are formed by adsorbing tetraphthalocyanine molecules combined with iron to a spherical or powdered anion exchange resin having a size between 0.05 mm and 1 mm. Water treatment method using catalytic dynamic membrane.

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