Apparatus and method for wastewater treatment using photocatalyst

Water treatment apparatus and water treatment method using a photocatalyst {Apparatus and method for wastewater treatment using photocatalyst}

The present invention relates to water treatment, and more particularly, to a water treatment apparatus and a water treatment method using a photocatalyst that purifies polluted water by decomposing pollutants in polluted water using a catalytic reaction of a photocatalyst.

Polluted water discharged from homes, factories, and businesses often contains a large amount of toxic or harmful substances, so discharging it as it is will cause serious environmental pollution. Therefore, for water quality conservation in public waters, polluted water discharged from factories or business establishments is purified until it reaches the standards stipulated in the Framework Act on Environmental Policy, the Water Quality Conservation Act, and the Act on the Treatment of Sewage, Excreta and Livestock Contaminated Water, and then discharged. should be To this end, the contaminated water is discharged to the outside after being purified by treatment methods such as solid/liquid separation, physicochemical treatment, and biological treatment while passing through a water treatment device.

Currently, with the development of industry, environmental pollution problems are becoming more and more serious, and regulations on pollutants are also being strengthened. According to this trend, new methods for removing pollutants are being developed, and one of them is the Advanced Oxidation Process (AOP).

The advanced oxidation method generates OH radicals, which have stronger oxidizing power than oxidizing agents used in normal oxidation processes, in the reactor, and these radicals convert organic compounds contained in contaminated water into CO.₂I H₂It is a technology that decomposes into harmless compounds such as O. This advanced oxidation method is a more advanced water treatment technology that mainly treats difficult-to-decompose compounds contained in polluted water.₃) to adjust the pH or hydrogen peroxide (H₂O₂), a complex oxidation method that increases oxidative power by adding additional treatment using ultraviolet (UV) light, etc. The advanced oxidation method using the high oxidizing power of OH radicals reduces organic pollutants in water to CO.₂and H₂Because it decomposes into O, it does not cause secondary pollution and has the advantage of being able to treat biodegradable and difficult-to-decompose pollutants.

The advanced oxidation method uses ozone (O₃) or a method of irradiating ultraviolet light to hydrogen peroxide, a method of adjusting pH, a method of using a semiconductor metal compound as a photocatalyst, and the like. Here, the photocatalyst is a material that causes a catalytic reaction when receiving light, and is a semiconductor material that uses light as an energy source to promote the catalytic reaction to decompose various bacteria and pollutants. Titanium dioxide (TiO) is a material with semiconductor properties that can be used as a raw material for photocatalysts.₂), tin oxide (SnO₂), tungsten oxide (WO₃), zinc oxide (ZnO), cadmium sulfide (CdS), etc., among which titanium dioxide (TiO)₂) is abundant in resources, has excellent durability and abrasion resistance as a photocatalyst, and as a safe and non-toxic material in itself, there is no concern about secondary pollution even when disposed of.

A water treatment device using a semiconductor metal compound such as titanium dioxide as a photocatalyst can efficiently remove difficult-to-decompose organic compounds that are difficult to treat with standard activated sludge methods, is convenient to operate and operate, and is suitable for the treatment process of contaminated water by UV rays. It has advantages such as easy application. A brief look at the photocatalytic oxidation reaction mechanism by titanium dioxide and ultraviolet (UV) light in aqueous solution is as follows.

When the ultraviolet light emitted from the UV lamp supplies light energy (wavelength < 387.5 nm) higher than the band gap energy (3.2 eV) to titanium dioxide, which is the catalyst, the electron-filled valence band of titanium dioxide Electrons are emitted and move to the conduction band, and at the same time, positive holes are created in the valence band of titanium dioxide. In addition, the excited electrons react with oxygen, which is an electron acceptor adsorbed on the surface of the catalyst, to generate superoxide radicals, which react with water molecules to form hydroxyl radicals with high oxidizing power ( hydroxyl radical).

At the same time, holes generated on the surface of titanium dioxide react with water molecules or hydroxyl ions adsorbed on the catalyst to generate hydroxyl radicals, or directly react with organic compounds to decompose organic compounds. In addition, both electrons and holes generated in the photocatalyst generate OH radicals through oxidation and reduction reactions. At this time, the generated OH radicals react with organic matter in various forms to undergo decomposition.

<p>When titanium dioxide is directly used in powder form like a conventional photocatalytic oxidation device, fine particles of titanium dioxide with a particle size of several μm to several nm are suspended in a sol state, making it difficult to separate and recover titanium dioxide from purified water again. have. For this reason, it has been common to use titanium dioxide, which is a photocatalyst, in a coating method such as spray coating, spin coating, or dip coating, on an aluminum plate or glass, etc., rather than in powder form.</p><p>However, a conventional water treatment device in which a plurality of photocatalyst plates coated with a photocatalyst are stacked and contaminated water is passed through the photocatalyst plate to purify the conventional water treatment device increases in volume due to the installation of the photocatalyst plate and has a problem in that the efficiency of treating contaminated water is reduced. </p><p>Recently, a water treatment device having a spiral structure has been introduced to reduce the volume and increase the efficiency of the treatment of contaminated water. The spiral structure of the water treatment device increases the time the contaminated water comes into contact with the photocatalyst plate by flowing the contaminated water along the spiral passage formed by the photocatalyst plate.</p><p>However, such a conventional water treatment device also does not have a smooth contact between the photocatalyst and the contaminants in the contaminated water, so the decomposition efficiency of the contaminants is lowered, and the purification ability is insignificant due to the structure using a single UV lamp. And there are differences in sterilization power, volatile organic compound (VOC) removal efficiency, deodorization power, etc. depending on the wavelength of light irradiated from the UV lamp. In addition, in the conventional water treatment device having a spiral structure, the inner end of the spirally wound photocatalyst plate is in direct contact with the UV lamp.</p><p>The present invention has been devised in view of this point, and the present invention is a water treatment that enables reuse by simply recovering the photocatalyst powder contained in the purified water from which the contaminated water has been purified while increasing the purification efficiency of the contaminated water using the photocatalyst powder. An object of the present invention is to provide an apparatus and a water treatment method. </p>

<p>A water treatment apparatus according to the present invention for achieving the above object includes a treatment tank having a purification chamber, a contaminated water supply pipe connected to the treatment tank to supply contaminated water to the treatment tank, and a magnetic material in the contaminated water flowing into the purification chamber. A photocatalyst input device for inputting magnetic photocatalyst powder bound to a photocatalyst material, a purified water discharge pipe connected to the treatment tank to discharge purified water purified by the magnetic photocatalyst powder from the purification chamber, and the magnetic photocatalyst powder contained in purified water and a photocatalyst collecting device having a magnet disposed on the purified water discharge pipe to collect the magnetic photocatalyst powder to prevent it from being discharged through the purified water discharge pipe. </p><p>The water treatment apparatus according to the present invention comprises a de-collection device for de-collecting the magnetic photocatalyst powder collected by the magnet, and a photocatalyst recovery tank connected to the purified water discharge pipe to recover the magnetic photocatalyst powder de-collected from the magnet. may include more. </p><p>The water treatment device according to the present invention further comprises a transport fluid supply device connected to the purified water discharge pipe to supply a transport fluid for transporting the magnetic photocatalyst powder that has been released from the magnet toward the photocatalyst recovery tank to the inside of the purified water discharge pipe. may include </p><p>The magnet is disposed on the outer surface of the purified water discharge pipe so that the magnetic photocatalyst powder can be attached to the inner surface of the purified water discharge pipe, and the collection release device moves the magnet to separate the magnet from the purified water discharge pipe. may include. </p><p>The magnet is an electromagnet operated by receiving a current, and the collection release device may include a current control device for controlling the current supplied to the magnet. </p><p>In order to filter the magnetic photocatalyst powder passing through the photocatalyst collecting device from the magnetic photocatalyst powder flowing along the purified water discharge pipe together with purified water, the water treatment device according to the present invention is a manure installed downstream of the photocatalyst collecting device of the purified water discharge pipe. It may further include a member. </p><p>The water treatment apparatus according to the present invention may further include a photocatalyst supply pipe connecting the photocatalyst input device and the photocatalyst recovery tank to transport the magnetic photocatalyst powder recovered to the photocatalyst recovery tank to the photocatalyst input device. </p><p>The water treatment apparatus according to the present invention may further include a stirrer installed inside the treatment tank to stir the contaminated water and the magnetic photocatalyst powder injected into the purification chamber. </p><p>The water treatment apparatus according to the present invention includes a polluted water concentration sensor for measuring the concentration of pollutants contained in the polluted water flowing into the treatment tank, and a concentration of pollutants contained in the polluted water flowing into the treatment tank from the polluted water concentration sensor. The control device may further include a control device for controlling the photocatalyst input device to receive information and to inject an appropriate amount of the magnetic photocatalyst powder into the contaminated water flowing into the treatment tank. </p><p>The magnetic material constituting the magnetic photocatalyst powder may include at least one of iron (Fe), cobalt (Co), chromium (Cr), and nickel (Ni). </p><p>The photocatalyst material constituting the magnetic photocatalyst powder is preferably titanium dioxide. </p><p>The photocatalyst material constituting the magnetic photocatalyst powder may be titanium dioxide doped with nitrogen or carbon to exhibit photoresolving power even in a visible light region. </p><p>On the other hand, the water treatment method according to the present invention for achieving the above object, (a) injecting a magnetic photocatalyst powder in which contaminated water and a magnetic material are combined with a photocatalyst material into the treatment tank, (b) the pollution injected into the treatment tank decomposing contaminants in contaminated water by irradiating water and light to the magnetic photocatalyst powder to activate the magnetic photocatalyst powder; (d) collecting the magnetic photocatalyst powder contained in the purified water discharged through the purified water discharge pipe using the magnetic force of a magnet disposed in the purified water discharge pipe, (e) the magnetic photocatalyst captured by the magnet recovering the powder. </p><p>The step (e) includes: (e-1) de-collecting the magnetic photocatalyst powder collected by the magnet; and (e-2) using the magnetic photocatalyst powder de-collected from the magnet as a photocatalyst connected to the purified water discharge pipe. It may include the step of collecting in a recovery tank. </p><p>The step (e) may further include, after the step (e-1), supplying a transport fluid into the purified water discharge pipe to transport the magnetic photocatalyst powder that has been released from the magnet toward the photocatalyst recovery tank. can </p><p>In the water treatment method according to the present invention, after step (d), the magnetic photocatalyst powder that has passed through the photocatalyst collecting device from the magnetic photocatalyst powder flowing along the purified water discharge pipe together with the purified water from the contaminated water further comprises the step of filtering can do. </p><p>The water treatment method according to the present invention may further include, after step (e), transporting the recovered magnetic photocatalyst powder to the photocatalyst input device. </p><p>The step (b) may include agitating the contaminated water introduced into the treatment tank and the magnetic photocatalyst powder. </p>

<p>The water treatment apparatus and the water treatment method according to the present invention can evenly disperse the magnetic photocatalyst powder in the polluted water, thereby increasing the efficiency of decomposition of pollutants in the polluted water by the catalytic reaction of the photocatalyst. </p><p>In addition, the water treatment apparatus and water treatment method according to the present invention collect magnetic photocatalyst powder with magnetism using a magnet for photocatalyst collection during the discharge process of purified water, so that the magnetic photocatalyst powder can be recovered and reused, thereby reducing operating costs and saving resources. waste can be prevented. </p><p>In addition, the water treatment device and the water treatment method according to the present invention use a magnetic photocatalyst powder that reacts not only with ultraviolet light but also with visible light, so that the photocatalytic reaction can be smoothly performed. It can be economical </p><p>In addition, the water treatment apparatus and the water treatment method according to the present invention can be widely used in various water purification apparatuses such as water purifiers as well as treatment of contaminated water discharged from homes, factories, or businesses. </p>

1 schematically shows the configuration of a water treatment apparatus using a photocatalyst according to an embodiment of the present invention. 2 is a block diagram showing a partial configuration of a water treatment apparatus using a photocatalyst according to an embodiment of the present invention. 3 shows a process of discharging purified water and collecting magnetic photocatalyst powder of a water treatment device using a photocatalyst according to an embodiment of the present invention. 4 is a view showing a magnetic photocatalyst powder recovery process of a water treatment device using a photocatalyst according to an embodiment of the present invention. 5 shows a process of re-supplying the recovered magnetic photocatalyst powder of the water treatment apparatus using the photocatalyst according to an embodiment of the present invention. 6 schematically shows the configuration of a water treatment apparatus using a photocatalyst according to another embodiment of the present invention. 7 is a block diagram showing a partial configuration of a water treatment apparatus using a photocatalyst according to another embodiment of the present invention.

Hereinafter, a water treatment apparatus and a water treatment method using a photocatalyst according to the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation.

1 schematically shows the configuration of a water treatment apparatus using a photocatalyst according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a partial configuration of a water treatment apparatus using a photocatalyst according to an embodiment of the present invention.

1 and 2 , in the water treatment apparatus 100 according to an embodiment of the present invention, the treatment tank 110 in which the contaminated water is purified by a photocatalyst, and the contaminated water supplied to the treatment tank 110 . The photocatalyst input device 118 for supplying the magnetic photocatalyst powder (C; see FIG. 3) to the lamp 124 for irradiating light into the treatment tank 110, and the contaminated water supplied into the A stirrer 126 for evenly mixing the magnetic photocatalyst powder (C), a photocatalyst collecting device 140 for collecting the magnetic photocatalyst powder (C) contained in the purified water discharged from the treatment tank 110, a photocatalyst collecting device 140 ) includes a photocatalyst recovery tank 144 for recovering the magnetic photocatalyst powder C collected by ), and a control device 150 for controlling the overall operation of the water treatment device 100 .

Here, the magnetic photocatalyst powder (C) has a structure in which a magnetic material is combined with a photocatalyst material to exhibit magnetism and may be attached to a magnet. That is, the magnetic photocatalyst powder (C) may be used in which a magnetic material is combined with a material used as a conventionally known photocatalyst. As the magnetic material, iron (Fe), cobalt (Co), chromium (Cr), nickel (Ni), etc. may be used.

As the photocatalyst material, any that can be used as a photocatalyst may be used, for example, titanium dioxide (TiO₂), tin oxide (SnO₂), tungsten oxide (WO₃), zinc oxide (ZnO), cadmium sulfide (CdS), and the like may be used.

In particular, titanium dioxide itself or titanium dioxide doped with metals such as Ag, V, and Pt, or titanium dioxide with non-metal elements such as C and N to exhibit optical resolution in the visible region may be used.

The binding of the magnetic material to the photocatalytic material (particularly titanium dioxide) may include: (1) preparing a magnetic material precursor solution by dissolving or dispersing the magnetic material precursor in a solvent; (2) mixing and reacting a photocatalytic material with the solution prepared through the process of 'step (1)'; And (3) through the process of the 'step (2)', the solution prepared in the 'step (1)' and the photocatalyst material in which the reaction has been completed may be subjected to a heat treatment step, and in addition, by various methods can be done

Referring to FIGS. 1 and 2 , a purification chamber 111 in which contaminated water and photocatalyst powder C are accommodated is provided inside the treatment tank 110 . The treatment tank 110 is made of a transparent or translucent material so that light generated from the lamp 124 disposed outside can be transmitted into the treatment tank 110 . A contaminated water supply pipe 113 is connected to one side of the treatment tank 110 , and the contaminated water flows into the treatment tank 110 through the contaminated water supply pipe 113 . Although not shown in the drawings, a concentration sensor for measuring the concentration of contaminants in the contaminated water may be installed in the treatment tank 110 . When the concentration of the pollutants in the polluted water introduced into the treatment tank 110 is measured with the concentration sensor, the status of the polluted water treatment can be confirmed.

The polluted water supply pipe 113 includes a polluted water supply control valve 114 for controlling the inflow of polluted water, and polluted water for measuring the flow rate of polluted water flowing into the treatment tank 110 through the polluted water supply pipe 113 . A flow meter 115 and a polluted water concentration sensor 116 for measuring the concentration of pollutants in the polluted water flowing along the polluted water supply pipe 113 are installed. The measurement signals of the polluted water flow meter 115 and the polluted water concentration sensor 116 are provided to the control device 150 . The control device 150 calculates the input amount of the magnetic photocatalyst powder (C) capable of efficiently purifying the contaminated water introduced into the treatment tank 110 from these measurement signals, and controls the photocatalyst input device 118 to control the magnetic photocatalyst. The powder (C) is put into the treatment tank 110 as much as the output amount.

The photocatalyst input device 118 includes a photocatalyst input pipe 119 connected to the contaminated water supply pipe 113, a photocatalyst storage tank 120 for storing the photocatalyst powder C, and a photocatalyst to control the amount of photocatalyst powder C input. and a photocatalyst input control valve 121 installed in the input pipe 119 . The photocatalyst storage tank 120 is provided with a photocatalyst concentration sensor 122 for measuring the concentration of the photocatalyst powder (C) stored in the photocatalyst storage tank 120 .

Since washing water may be introduced together with the magnetic photocatalyst powder (C) recovered to the photocatalyst recovery tank (144) into the photocatalyst storage tank (120), the concentration of the magnetic photocatalyst powder (C) in the photocatalyst storage tank (120) may vary from time to time. can The photocatalyst concentration sensor 122 measures the concentration of the magnetic photocatalyst powder C in the photocatalyst storage tank 120 in real time and provides the measurement signal to the control device 150 . The control device 150 adjusts the opening amount or opening time of the photocatalyst input control valve 121 according to the concentration of the magnetic photocatalyst powder (C) so that an appropriate amount of the magnetic photocatalyst powder (C) is introduced into the treatment tank 110 . make it possible

The lamp 124 is disposed outside the treatment tank 110 to irradiate light into the treatment tank 110 . An ultraviolet lamp may be used as the lamp 124 , and when the photocatalyst material constituting the magnetic photocatalyst powder C is a visible light responsive type, various light emitting devices capable of irradiating visible light may be used. The lamp 124 may be disposed inside the treatment tank 110 , and when the treatment tank 110 is transparent and the photocatalytic material is a visible light responsive type, it may not be installed or may be used as an auxiliary light source.

The stirrer 126 is disposed inside the treatment tank 110 to evenly stir the contaminated water and the magnetic photocatalyst powder (C), and promote decomposition of the pollutants by the magnetic photocatalyst powder (C). The stirrer 126 includes a plurality of stirring blades 127 disposed in the purification chamber 111 , a rotation shaft 128 to which the stirring blades 127 are coupled, and a motor 129 for rotating the rotation shaft 128 .

Purified water purified by reacting with the photocatalyst powder C in the treatment tank 110 is discharged to the outside through the purified water discharge pipe 131 connected to the treatment tank 110 . In the purified water discharge pipe 131, a first drain control valve 132 and a second drain control valve 133 for controlling the flow of fluid through the purified water discharge pipe 131, filtering the photocatalyst powder (C) contained in the purified water For the filtering member 134 is disposed. The filtering member 134 is disposed downstream of the photocatalyst recovery tank 144 of the purified water discharge pipe 131, and in the magnetic photocatalyst powder (C) flowing along the purified water discharge pipe 131 together with the purified water, the photocatalyst collecting device 140 is disposed in the photocatalyst collecting device 140 . The uncollected magnetic photocatalyst powder (C) or the unrecovered magnetic photocatalyst powder (C) is collected in the photocatalyst recovery tank 144 .

The first drain control valve 132 and the second drain control valve 133 are controlled by the control device 150 to selectively open and close the flow path of the purified water discharge pipe 131 . The first drain control valve 132 is disposed upstream of the photocatalyst collecting device 140 of the purified water discharge pipe 131 , and the second drain control valve 133 is connected to the photocatalyst recovery tank 144 of the purified water discharge pipe 131 and the filter. It is disposed between the members 134 .

A washing water supply pipe 136 is connected between the first drain control valve 132 of the purified water discharge pipe 131 and the photocatalyst collecting device 140 . The washing water supply pipe 136 guides the washing water supplied from the washing water supply device 137 to the purified water discharge pipe 131 . A washing water supply pipe opening/closing valve 138 for opening and closing the flow path of the washing water supply pipe 136 is installed in the washing water supply pipe 136 . The washing water supply device 137 supplies the washing water to the purified water discharge pipe 131 to transport the magnetic photocatalyst powder C, which is collected and released by the photocatalyst collecting device 140 , toward the photocatalyst recovery tank 144 .

It is difficult for the magnetic photocatalyst powder (C) to be captured and released by the photocatalyst collecting device 140 to naturally move toward the photocatalyst recovery tank 144 downstream of the purified water discharge pipe 131 . Therefore, when a carrier fluid such as washing water is supplied to the purified water discharge pipe 131 , the magnetic photocatalyst powder C is swept away by the carrier fluid and can easily move toward the photocatalyst recovery tank 144 . As a transport fluid supply device for providing a transport fluid for transporting the magnetic photocatalyst powder (C), other liquid supply devices capable of supplying various liquids in addition to the washing water supply device 137 as described above, or spraying air or gas Thus, various gas injection devices capable of moving the magnetic photocatalyst powder C toward the photocatalyst recovery tank 144 may be used.

Referring to FIG. 1 , the photocatalyst collecting device 140 includes a photocatalyst collecting magnet 141 and a photocatalyst collecting magnet 141 for attaching photocatalyst powder C contained in purified water discharged through a purified water discharge pipe 131 . It includes a magnet moving device 142 for moving the. The photocatalyst collecting magnet 141 is disposed on the outside of the purified water discharge pipe 131 , and moves forward and backward by the magnet moving device 142 to approach the outer surface of the purified water discharge pipe 131 or away from the purified water discharge pipe 131 . The photocatalyst collecting magnet 141 may be provided in various shapes such as a rod-shaped, plate-shaped, curved surface, etc., and when it is formed in an arc shape corresponding to the outer circumferential surface of the purified water discharge pipe 131, the magnetic photocatalyst powder (C) attachment area is wider can do. When the photocatalyst collecting magnet 141 is in contact with or close to the outer surface of the purified water discharge pipe 131, the magnetic photocatalyst powder (C) contained in the purified water flowing along the purified water discharge pipe 131 is applied to the magnetic force of the photocatalyst collecting magnet 141. It is attached to the inner surface of the purified water discharge pipe 131 by the

The magnet moving device 142 moves the photocatalyst collecting magnet 141 close to the purified water discharge pipe 131 or away from the purified water discharge pipe 131, and the magnetic photocatalyst powder (C) collected by the photocatalyst collecting magnet 141 ) acts as a collection and release device to release the collection. That is, when the magnet moving device 142 moves the photocatalyst collecting magnet 141 away from the purified water discharge pipe 131, the magnetic force exerted by the photocatalyst collecting magnet 141 on the inner surface of the purified water discharge pipe 131 is removed, and the purified water discharge pipe The magnetic photocatalyst powder (C) that was collected on the inner surface of 131 is released. At this time, when the washing water flows into the purified water discharge pipe 131, the de-collected magnetic photocatalyst powder (C) can be easily swept away by the washing water. As the magnet moving device 142 , various devices capable of providing a moving force to the photocatalyst collecting magnet 141 may be used.

Although the drawing shows that two photocatalyst collecting magnets 141 and magnet moving device 142 are disposed, the number of the photocatalyst collecting magnets 141 and magnet moving device 142 can be variously changed. .

The photocatalyst recovery tank 144 is connected to the purified water discharge pipe 131 through the photocatalyst recovery pipe 143 connected to the purified water discharge pipe 131 between the photocatalyst collecting device 140 and the second drain control valve 133 . The photocatalyst recovery pipe 143 is provided with a photocatalyst recovery pipe opening/closing valve 145 for opening and closing the flow path inside the photocatalyst recovery pipe 143 . The photocatalyst recovery pipe opening/closing valve 145 is automatically controlled by the control device 150, and is closed when the purified water is discharged and the magnetic photocatalyst powder (C) is collected, and when the magnetic photocatalyst powder (C) is released and the washing water is introduced. is opened to allow the magnetic photocatalyst powder (C) to flow into the photocatalyst recovery tank (144).

The magnetic photocatalyst powder (C) recovered to the photocatalyst recovery tank 144 is supplied to the photocatalyst storage tank 120 through the photocatalyst supply pipe 147 . A photocatalyst supply pump 148 is installed in the photocatalyst supply pipe 147 to transfer the magnetic photocatalyst powder C from the photocatalyst recovery tank 144 to the photocatalyst storage tank 120 .

In this embodiment, the photocatalyst recovery tank 144 accommodates not only the magnetic photocatalyst powder (C) but also the washing water, so that the magnetic photocatalyst powder (C) together with the washing water is transferred to the photocatalyst storage tank (120) using the photocatalyst supply pump (148). can be transferred to However, when only the magnetic photocatalyst powder C is recovered in the photocatalyst recovery tank 144 , another device that can be used to transport the powder, such as a screw conveyor, may be installed in the photocatalyst supply pipe 147 .

Hereinafter, a process for treating contaminated water of the water treatment apparatus 100 according to an embodiment of the present invention will be described.

First, as shown in FIG. 1 , when the contaminated water treatment process starts, the control device 150 opens the contaminated water supply control valve 114 to allow the contaminated water to enter the treatment tank 110 through the contaminated water supply pipe 113 . to be introduced into At this time, the polluted water flow meter 115 and the polluted water concentration sensor 116 measure the flow rate of the polluted water input to the treatment tank 110 and the concentration of pollutants contained in the polluted water, and provide the measured flow rate to the control device 150 . The control device 150 includes information on the flow rate and concentration of pollutants provided from the polluted water flow meter 115 and the polluted water concentration sensor 116 and the photocatalyst storage tank 120 provided from the photocatalyst concentration sensor 122. Calculate the input amount of the magnetic photocatalyst powder (C) from the concentration of the magnetic photocatalyst powder (C). Then, by controlling the photocatalyst input control valve 121, an appropriate amount of magnetic photocatalyst powder (C) is introduced into the contaminated water.

When a certain amount of contaminated water and magnetic photocatalyst powder (C) are introduced into the treatment tank 110 , the control device 150 shuts off the contaminated water supply control valve 114 , and the stirrer 126 and the lamp 124 . to operate At this time, the magnetic photocatalyst powder (C) dispersed in the contaminated water is activated by the light of the lamp 124 to decompose the contaminants in the contaminated water.

When the purification process by the magnetic photocatalyst powder C in the treatment tank 110 is finished, the control device 150 controls the first drain control valve 132 and the second drain control valve 133 as shown in FIG. 3 . ) to discharge the purified water in the treatment tank 110 through the purified water discharge pipe 131 . When Chirisu flows downstream along the purified water discharge pipe 131 , the magnetic photocatalyst powder C in the purified water is attached to the inner surface of the purified water discharge pipe 131 by the magnetic force of the photocatalyst collecting magnet 141 . And the magnetic photocatalyst powder (C) that is not collected by the photocatalyst collecting magnet 141 is collected in the filtering member 134 downstream of the purified water discharge pipe 131 .

When the discharge of purified water is completed, the control device 150 closes the first drain control valve 132 and the second drain control valve 133 as shown in FIG. 4 , and operates the magnet moving device 142 to The photocatalyst collecting magnet 141 is spaced apart from the purified water discharge pipe 131 . Then, the photocatalyst recovery pipe opening/closing valve 145 and the washing water supply pipe opening/closing valve 138 are opened, and the washing water supply device 137 is operated to introduce the washing water into the purified water discharge pipe 131 . At this time, the magnetic photocatalyst powder (C) collected by the photocatalyst collecting magnet 141 is swept away by the washing water flowing into the purified water discharge pipe 131 and is recovered to the photocatalyst recovery tank 144 through the photocatalyst recovery pipe 143.

When the magnetic photocatalyst powder (C) recovery process is finished, the control device 150 operates the photocatalyst supply pump 148 to transfer the recovered magnetic photocatalyst powder (C) to the photocatalyst recovery tank 144 as shown in FIG. 5 . It is transferred to the photocatalyst storage tank 120 through the photocatalyst supply pipe 147 . The transfer process of the magnetic photocatalyst powder (C) may be performed simultaneously with the recovery process of the magnetic photocatalyst powder (C) as shown in FIG. 4 .

As described above, the water treatment apparatus 100 according to the present invention can increase the efficiency of decomposition of pollutants by the catalytic reaction of the photocatalyst by dispersing the magnetic photocatalyst powder (C) in polluted water. In addition, by collecting the magnetic photocatalyst powder (C) that exhibits magnetism using the magnet 141 for photocatalyst collection during the purification water discharge process, recovery and reuse of the magnetic photocatalyst powder (C) are possible, thereby reducing operating costs and wasting resources. can be stopped

Meanwhile, FIG. 6 schematically shows the configuration of a water treatment device using a photocatalyst according to another embodiment of the present invention, and FIG. 7 is a block diagram showing a partial configuration of a water treatment device using a photocatalyst according to another embodiment of the present invention. .

The water treatment apparatus 200 shown in FIGS. 6 and 7 has the same configuration as the water treatment apparatus 100 according to the embodiment of the present invention, except for the photocatalyst collecting apparatus 210 . Hereinafter, the same reference numerals are given to the same components as those of the water treatment apparatus 100 described above, and a detailed description thereof will be omitted.

6 and 7, the water treatment device 200 according to another embodiment of the present invention includes a treatment tank 110, a photocatalyst input device 118, a lamp 124, a stirrer 126, and a photocatalyst collecting device ( 140 ), a photocatalyst recovery tank 144 , a washing water supply device 137 , a photocatalyst supply pump 148 , and a control device 150 . The magnetic photocatalyst powder (C) has a structure in which a magnetic material is combined with a photocatalyst material as described above, and thus exhibits magnetism.

The photocatalyst collecting device 210 includes a photocatalyst collecting magnet 211 for attaching the photocatalyst powder (C) contained in the purified water discharged through the purified water discharge pipe 131 and a photocatalyst collecting magnet 211 for supplying current to and a current regulator 212 . The photocatalyst collecting magnet 211 is disposed on the outside of the purified water discharge pipe 131, and consists of an electromagnet that operates by receiving a current.

When the current controller 212 supplies current to the photocatalyst collecting magnet 211, magnetic force is generated in the photocatalyst collecting magnet 211, and when the purified water is discharged along the purified water discharge pipe 131, magnetic photocatalyst powder (C) in the purified water ) is collected on the inner surface of the purified water discharge pipe 131 . On the other hand, when the current control device 212 cuts off the current supplied to the photocatalyst collecting magnet 211, the magnetic force of the photocatalyst collecting magnet 211 is removed and the magnetic photocatalyst powder (C) that was collected on the inner surface of the purified water discharge pipe 131 ) is decaptured.

The operation of the water treatment device 200 according to another embodiment of the present invention is mostly the same as that of the water treatment device 100 described above, except that the photocatalyst collecting magnet 211 operates by receiving current and the current control device 212. The only difference is that the collection and release of the magnetic photocatalyst powder (C) is made by blocking the current.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical spirit of the present invention, and the protection scope of the present invention is limited only by the matters described in the claims. Those of ordinary skill in the art of the present invention may improve or change the technical idea of the present invention in various forms, and such improvement and change will fall within the protection scope of the present invention.

100, 200: water treatment device 110: treatment tank 113: polluted water supply pipe 114: polluted water supply control valve 118: photocatalyst input device 120: photocatalyst storage tank 121: photocatalyst input control valve 124: lamp 126: agitator 131: purified water discharge pipe 132, 133: first, second drain control valve 134: filter member 137: washing water supply device 138: washing water supply pipe opening/closing valve 140, 210: photocatalyst collecting device 141, 211: photocatalyst collecting magnet 142: magnet moving device 144: photocatalyst recovery tank 145: photocatalyst recovery pipe opening/closing valve 148: photocatalyst supply pump 150: control device 212: current control device