KR100468621B1 - Water treatment system by electrolysis - Google Patents

Abstract

PURPOSE: To provide a water purification system which improves efficiency of electrolysis by minimizing purification of harmful substance and contamination of electrode and improves efficiency of a membrane and a carrier by using the carrier and the membrane containing photocatalyst, thereby photo-decomposing harmful substance separated. CONSTITUTION: The system for purifying water by electrolysis process comprises a reaction tank(100) in which a certain inner space is secured so that raw water or tap water flown in from a catchment tank is stored in the inner space, and an ultraviolet lamp(130) is installed in the inner space, which contains a carrier(110) containing photocatalyst, and in which an ultra-filtration or precision filtration membrane(120) formed of hollow fiber containing photocatalyst is installed; and an electrolyzer(200) in which an ultrasonic device is installed, and which is formed on an electrode part to produce acidic water and alkaline water from treated water passing through a filter unit, wherein the photocatalyst contained in the carrier and the membrane comprises TiO2 as a principal component, and wherein hollow fiber is used as the carrier.

Description

Water treatment system using electrolysis process {Water treatment system by electrolysis}

The present invention relates to a water purification device using a high-efficiency electrolysis process, and more particularly, to purify the water in the co-collecting device using a high oxidation process using a carrier and a separator containing a photocatalyst (rust, pathogenic microorganisms, volatile organics, And carcinogen removal) Designed electrolysis device equipped with ultrasonic device in the electrode part to efficiently remove the scale deposited on the electrode of the electrolysis device to increase the electrolysis efficiency to produce acidic water and alkaline water in each electrode part It is about.

In purifying sewage and drinking water, generally, various sizes of filters or electrolysis are used to remove harmful substances. When water is electrolyzed using the electrolysis process, it is possible to produce acidic water and alkaline water, and acidic water is used for washing or plant feed water and alkaline water is used as drinking water to supply healthy water. However, if a large amount of harmful organics, bacteria, and rust components that are not removed when water is electrolyzed is not possible to be removed by electrolysis alone, and these harmful organic substances or bacteria are fatal to health and must be removed. In particular, water purifiers using commercialized electrolysis currently use water through the old aged water purification pipes, so safety is not guaranteed and must be removed as a pretreatment. In addition, when the electrode is contaminated by harmful organic and inorganic substances during electrolysis, the electrolysis efficiency is reduced.

Korean Patent No. 436982 relates to a water treatment apparatus for inducing a telephone and performing an electrooxidation process using activated carbon. In addition, the Republic of Korea Utility Model No. 221980 relates to a device for producing a functional water by passing through a plurality of water filters to remove harmful substances contained in the tap water and electrolysis and through the ceramic metal and ultraviolet light.

The invention and the invention is to remove the harmful substances by using activated carbon and water purification filter before the electrolysis process, but the removed harmful substances remain in the filter affects the replacement cycle of the filter. In addition, the scale is accumulated on the electrode of the electrolysis device is also reduced electrolysis efficiency.

In addition, Korean Patent Publication Nos. 2001-0026409 and 2004-15928 disclose a process for treating water and hardly decomposable wastewater by combining membrane separation with a photocatalyst and membrane separation. A process for water treatment comprising the step of performing membrane separation to separate the photocatalyst mixed in the treated water after the oxidation of the pretreated treated water into the reaction tank in which the photocatalyst is suspended. For this purpose, the membrane separation process is used. However, since the particles of the photocatalyst are fine, it is difficult to recover and the recovered photocatalyst is required to be re-introduced through a predetermined treatment. In addition, since the photocatalyst cake is accumulated on the surface of the separator after a predetermined time, the efficiency of the process is low and economical because it has to be removed and recovered.

Therefore, in order to solve the above problems, the present invention can pretreat the feed water through a carrier containing a photocatalyst and a separator containing a photocatalyst to reduce contamination of the electrode as much as possible, and the filtered organic material is decomposed by the photocatalyst on the surface of the separator. Since the reaction takes place at the same time, it is an object of the present invention to provide a co-purifying device with improved electrolysis efficiency by allowing the life of the carrier and the separator to be extended.

In addition, it is an object of the present invention to provide a water purifier to prevent the accumulation of scale on the electrode by installing an ultrasonic device in the electrode portion of the electrolysis device.

It is also an object of the present invention to provide high quality water with functionality and safety.

Figure 1 shows a simplified process diagram of the water purifying apparatus of the present invention.

<Description of the symbols in the drawing>

10: inlet pipe 20: discharge water pipe 100: reactor

110: photocatalyst-containing carrier 120: photocatalyst-containing separator

130: ultraviolet lamp 200: electrolysis device 300: suction pump

In order to solve the above problems, the present inventors have carried out an advanced oxidation process using a carrier having a photocatalyst immobilized thereon and a separator containing a photocatalyst, and introduced an ultrasonic device in the electrolysis process to manufacture a water purification device.

Hereinafter, the present invention will be described in detail with reference to FIG. 1.

In the water purifying apparatus, the water purifying apparatus includes a carrier 110 having a constant internal space for storing raw water or tap water introduced from the water collecting apparatus and having an ultraviolet lamp 130 installed therein and containing a photocatalyst. And a reactor 100 in which ultrafiltration or microfiltration membranes 120 made of hollow fiber containing a photocatalyst are installed; It relates to a water purification device using an electrolysis process, including; electrolysis device 200 equipped with an ultrasonic device in the electrode unit for producing the treated water through the filtration device to acidic and alkaline water.

The reactor may be used as a fixed bed by filling the photocatalyst carrier, or may be used as a fluidized bed having an increased surface area by filling only an appropriate amount. Another economical problem occurs when the photocatalyst is used alone without containing the photocatalyst and the expensive photocatalyst is used due to the difficulty of recovery.

The separation membrane is manufactured by the ultrafiltration or microfiltration module in the form of a flat membrane impregnated with photocatalyst particles, so that photocatalytic reactions and bactericidal effects during ultraviolet irradiation are prevented from accumulating cake on the surface of the separator to improve separation efficiency, as in the prior art. The purpose is not to separate the photocatalyst, but to purify the water.

The ultraviolet lamp is a means for simultaneously performing ultraviolet sterilization as well as a light source for photoreaction of the photocatalyst.

In addition, the present invention is characterized in that the photocatalyst contained in the carrier 110 and the separator 120 contains TiO ₂ as a main component. In addition to the TiO ₂ , an organic material or a metal oxide having a bactericidal effect may be further added.

In addition, the present invention is characterized in that using the hollow fiber as the carrier (110). Hollow yarn used as the carrier can be used to manufacture the hollow fiber using the same composition as the hollow fiber membrane used in the filtration device, molded and manufactured in a predetermined length or desired shape.

The advanced oxidation process requires a long residence time in the reaction tank in order to increase the decomposition efficiency and sterilization efficiency of the organic material, which causes the problem that the volume of the water purification device increases due to the increase in the volume of the reaction tank. Therefore, in order to solve this problem, when the membrane combined with the photocatalyst is combined with the reaction tank, the organic decomposition reaction occurs simultaneously by the photocatalyst on the surface of the membrane, and bacteria do not pass through the membrane, thereby maximizing the sterilization effect. .

The advanced oxidation process is a very useful method for removing organic matter, and it can maximize the decomposition rate of organic matter by combining UV and photocatalyst. At this time, if the advanced oxidation process is applied in the form of nanoparticles without immobilizing the photocatalyst, it becomes difficult to recover the photocatalyst after the reaction. The present invention has been applied to manufacture a carrier having superior buoyancy and other performance than commercially supported photocatalyst products in a simple and economical manner.

In addition, by introducing an ultrasonic device in the electrolysis process to prevent contamination of the electrode in advance can reduce the efficiency of the electrolysis device. The existing pretreatment process used in the electrolysis process has a difficulty in frequently replacing the pretreatment apparatus due to contamination easily. It is possible to reduce the efficiency of the electrolysis device due to the contamination of the electrode by decomposing the organic material, which is the main pollutant source by the advanced oxidation process, and by preventing the contamination of the electrode in advance by introducing an ultrasonic device in the electrolysis process. You can increase it.

Thus, by using the advanced oxidation process that simultaneously applies the photocatalyst carrier and the photocatalyst-coupled separator, the water quality to the electrolysis device is good and the contamination of the electrolysis electrode can be minimized, thereby maximizing the efficiency of electrolysis. By extending the life as much as possible, the replacement cost of the electrode can be minimized.

Hereinafter, the present invention will be described in detail with reference to the following Examples, but the present invention is not limited to the Examples.

(Example 1)

Titania nanoparticles were dispersed in a solvent to give a polymer composition having a composition of polysulfone / NMP (N-methyl-2-pyrrolidone) / MC (methyl cellosolve) / PEG 600 (12/34/34 / 20wt%) 6 wt% of the mixture was prepared to prepare a homogeneous polymer solution, and then continuously molded into hollow fiber shapes, and the molded hollow fiber was cut to a predetermined size to prepare a carrier impregnated with titania nanoparticles.

In this example, the resolution of the 4-nitrophenol 10 ppm aqueous solution, which was hardly decomposable, was measured while installing the prepared carrier and the ultraviolet lamp and supplying air. Table 1 shows the results of measuring the concentration of the remaining organic matter over time.

Minutes 0 30 60 120 180 Concentration (ppm) 10 8.1 5.2 3.3 1.2

(Comparative Example 1)

The experiment was performed in the same manner as in Example 1, except that titania nanoparticles were used without immobilizing titania on a carrier. The results are shown in Table 2.

Minutes 0 30 60 120 180 Concentration (ppm) 10 5.2 2.7 1.4 0.3

(Example 2)

In this embodiment, after the hollow fiber membrane is manufactured using the polymer solution used to prepare the carrier in Example 1, the module is manufactured and contained in the raw water while inhaling it under vacuum while irradiating a UV lamp near the surface of the membrane. The concentration of organic matter was observed.

Table 3 shows the concentration change of the organic material with time depending on the use of the carrier containing the photocatalyst.

Minutes Organic matter concentration (ppm) 0 30 60 120 180 Example 1 10 8.1 5.2 3.3 1.2 Separator 10 9.3 8.5 7.3 6.7 Carrier / Membrane 10 7.6 4.1 2.7 0.5

(Example 3)

Table 4 shows the electrolysis efficiency (pH, alkaline water) with time in the electrolysis process of tap water and non-tap water, which has undergone high-efficiency highly oxidative processes using a carrier and a membrane containing titania nanoparticles, which are photocatalysts. Tap water that has undergone advanced oxidation does not significantly reduce electrolysis efficiency over time compared to tap water that has not undergone advanced oxidation, whereas tap water that has not undergone advanced oxidation has significantly reduced electrolysis efficiency.

Time (day) Electrolysis efficiency 0 10 20 40 60 80 100 tap water 6.5 8.3 8.1 7.3 6.5 6.5 6.5 Tap Water / Membrane 6.5 8.3 8.3 8.0 7.4 7.0 6.5 Tap Water / Advanced Oxidation Process 6.5 8.3 8.3 8.1 7.8 7.3 6.8 Tap Water / Advanced Oxidation Process / Membrane 6.5 8.3 8.3 8.3 8.3 7.8 7.4

(Example 4)

The application of tap water after advanced oxidation process to electrolysis process was compared with electrolysis efficiency according to the presence or absence of sonication.

Time (day) Electrolysis efficiency 0 10 20 40 60 80 100 tap water 6.5 8.3 8.3 7.5 7.1 6.5 6.5 Tap Water / Membrane 6.5 8.3 8.3 8.3 7.7 7.2 6.5 Tap Water / Advanced Oxidation Process 6.5 8.3 8.3 8.3 8.3 7.9 7.5 Tap Water / Advanced Oxidation Process / Membrane 6.5 8.3 8.3 8.3 8.3 8.3 8.3

(Example 5)

The ratio of the initial permeate flow rate of the tap water / high oxidation process / separation membrane (A) and the tap water / separation membrane (B) and the general water treatment device (pre-filter / cement filter / activated carbon) (C) used in the water purifier is shown.

Day Electrolysis efficiency 0 10 20 40 60 80 100 A One One One 0.92 0.85 0.8 0.76 B One 0.94 0.83 0.7 0.61 0.55 0.48 C One 0.91 0.82 0.69 0.58 0.49 0.38

As confirmed in the above embodiment, when the advanced oxidation process was applied using the carrier on which the titania nanoparticles were immobilized, the efficiency was greatly improved since the recovery was easy without significantly decreasing the efficiency than the case where the carrier was not used. In addition, by combining the membrane impregnated with nanoparticles in order to minimize the use site of the advanced oxidation process and maximize the efficiency, it was possible to improve the complete removal of bacteria and decomposition of organic matter.

As a result, tap water which has undergone highly oxidation process is minimized contamination of electrode when it is applied to electrolysis process compared to tap water which is not so, electrolysis efficiency can be maximized and electrode replacement cycle can be minimized. Cleaning the electrode by installing a device could minimize contamination of the electrode than otherwise.

As described above, it is possible to provide a water purifying apparatus which improves the efficiency of electrolysis by purifying harmful substances of the present invention and minimizing contamination of electrodes.

In addition, the present invention can provide a very economical water purification device by improving the efficiency of the separation membrane and the carrier since the harmful substances are separated by the photolysis using the carrier and the membrane containing the photocatalyst.

In addition, the present invention can provide a water purification device that can be installed in an apartment, a building, and a multi-unit house to provide water to which functionality is provided.

Claims (3)

In the water purifier, Ultrafiltration or microfiltration manufactured by hollow fiber containing a photocatalyst containing a carrier containing a photocatalyst and having a constant internal space so that raw water or tap water flowing from the water collecting device can be stored therein. A reactor equipped with a separator; And an electrolysis device having an ultrasonic device installed at the electrode to produce treated water through the filtration device into acidic and alkaline water. The water purification device using an electrolysis process according to claim 1, wherein the photocatalyst contained in the carrier and the separator has TiO ₂ as a main component. The water purification device using an electrolysis process according to claim 1 or 2, wherein the support is hollow fiber.