KR20200025264A - A wastewater treatment system by using photocatalysis - Google Patents

Abstract

The present invention provides a water treatment device using a photocatalyst. According to the present invention, when using a photocatalyst device having a double tube membrane structure including a nano filter coated with photocatalyst particles, it is possible to prevent problems such as the production of secondary carcinogenic organic contaminants. In addition, a separate device for recovering and reusing the photocatalyst is not additionally required, thereby realizing cost reduction.

Description

Water treatment device using photocatalyst {A WASTEWATER TREATMENT SYSTEM BY USING PHOTOCATALYSIS}

The present invention relates to a wastewater treatment apparatus using a filter containing a photocatalyst.

Recently, due to rapid industrial development, environmental pollution has become a big problem. In order to solve the environmental pollution problem, various alternatives have been proposed. In particular, it is becoming increasingly difficult to supply hard-decomposable organic substances into the contaminated water due to the increase of domestic waste and industrial wastewater, which gradually intensifies water pollution.

Therefore, the demand for a water treatment apparatus capable of effectively treating water pollution is increasing day by day. Among the water treatment methods developed so far, there are advantages such as using microorganisms because they are environmentally friendly and do not cause secondary pollution and do not destroy the ecosystem, but they are limited in decomposing pollutants in the water system. There are problems in that huge financial costs such as treatment costs and maintenance costs are required to meet the discharged water quality standards.

On the other hand, the water treatment method using chlorine-based chemicals can achieve the purpose of discoloration or sterilization, but may react with organic substances in water to cause secondary pollution such as carcinogens, and the treated water is discharged to the stream after chlorine treatment. Chlorine content remaining in the treated water causes various problems such as damaging the ecosystem by lethal action on various microorganisms in the river basin.

Therefore, there is a need for a water treatment apparatus capable of efficiently treating wastewater, sewage, and sewage while overcoming the limitations of the aforementioned water treatment methods.

Accordingly, an aspect of the present invention is to provide a water treatment apparatus including a photocatalyst capable of effectively treating various organic contaminants present in an aqueous system using a nanofilter coated with a photocatalyst to solve the above problems.

According to one aspect of the invention,

A reactor 1 comprising a predetermined space;

An inlet pipe 2 through which raw water flows into the reactor;

Located inside the reactor, the cross section is a donut-shaped, a double-walled tube membrane consisting of the inner wall (9) and the outer wall (8), comprising a nano filter layer (7) coated with photocatalyst particles on the porous support At least one photocatalyst device (3) installed so that at least part of the raw water comes into contact;

At least one ultraviolet irradiation device (4) located inside the reactor and irradiating at least a portion of the photocatalyst particles with ultraviolet rays;

An air blower (5) located in a direction facing the inlet pipe (2) and injecting air to flow the raw water introduced into the reactor (1); And

It provides a water treatment apparatus using a photocatalyst to send the treated water from the reactor (1), located in the direction facing the inlet pipe (2), including a discharge pipe (6) connected to the passage of the inner wall.

The ultraviolet irradiation device 4 has a photocatalyst particle coated on the nanofilter layer of the inner wall when the treated water passing through the nanofilter layer 7 of the outer wall 8 passes through the nanofilter layer 7 of the inner wall 9. It may be further located in the inner wall and the outer space of the tube film so as to be irradiated by ultraviolet light.

The air blower 5 may recirculate the raw water of the remainder not treated by the photocatalyst 3 to the inside of the reactor 1 to resupply the remaining raw water to the photocatalyst 3.

The water treatment apparatus using the photocatalyst according to the present invention can reduce the possibility of secondary contamination, which is not only environmentally friendly, but can also increase the efficiency of the water treatment. Furthermore, it is possible to solve financial problems in terms of processing cost and maintenance cost by not requiring additional devices such as a photocatalyst inflow and recovery device.

1 is a view showing an embodiment of a water treatment apparatus including a photocatalyst of the present invention.
2 is a view showing an embodiment in which the ultraviolet irradiation device 4 is included in a predetermined space outside the inner wall of the photocatalyst device of the present invention.

1 is a cross-sectional view showing the configuration of a water treatment apparatus using a photocatalyst according to an embodiment of the present invention.

According to a preferred embodiment of the present invention, as shown in FIG. 1, the reactor 1 includes a predetermined space, an inlet pipe 2 through which raw water flows into the reactor, and is located inside the reactor, the cross section having a donut shape, A double-walled tube membrane consisting of an inner wall and an outer wall, and including a nano-filter layer coated with photocatalytic particles on a porous support, the at least one photocatalyst device 3 installed in contact with at least a portion of raw water, and located inside the reactor At least one ultraviolet irradiation device (4) for irradiating at least a portion of the photocatalyst particles with ultraviolet light, located in the direction facing the inlet pipe, the air blower for flowing the raw water introduced by injecting air in the reactor (5) ) And sending the treated water from the reactor, located in the direction facing the inlet pipe, connected to the passage of the inner wall It may be a structure including a discharge pipe (6).

In more detail, the water treatment apparatus according to the present invention may include an inlet pipe 2 through which external raw water is introduced into the reactor. The inlet pipe (2) can be appropriately adjusted according to the flow rate if the raw water can flow.

The photocatalyst 3 included in the reactor 1 may have a donut-shaped cross section as shown in the enlarged view of FIG. 1, and may have a double-walled tube membrane formed of an inner wall 9 and an outer wall 8.

Specifically, the photocatalyst device has a tube membrane structure consisting of an inner wall 9 and an outer wall 8, and the double wall structure may be formed of a porous support. Furthermore, the photocatalyst particles are coated on the porous support so that the double wall may be formed of the nano filter 7. In this case, the size of the photocatalyst may be appropriately selected according to the capacity of the reactor and the amount of raw water introduced.

Meanwhile, the method of coating the photocatalytic particles on the porous support is not particularly limited, and may be coated in a thin film form, for example. In this case, the photocatalyst component is not supplied in a powder form, but is coated on a porous support in a thin film to form a film, thereby preventing the problem of adhesion stability or loss during water treatment, and separately recovering or posttreating the photocatalyst. Or no device is required, which maximizes the efficiency of the process.

The photocatalyst 3 is located inside the reactor 1, for example, is located in close contact with the inner side of the reactor or at a constant distance from the inner side such that at least a portion of the photocatalyst 3 can come into contact with the introduced raw water. It can be located at a distance. At this time, the distance between the inner surface and the constant distance is not particularly limited and may be appropriately selected according to the reactor size.

When at least one photocatalyst device is present as described above, the number and size of the photocatalyst may be adjusted according to the amount of raw water to be treated and the space in the reactor for accommodating the same, and the present invention is not particularly limited thereto.

On the other hand, the ultraviolet irradiation device 4 included in the reactor 1 is installed so as to irradiate the ultraviolet light to the photocatalyst particles coated on the photocatalyst, and is not particularly limited as long as it is a lamp capable of light irradiation. For example, a high pressure mercury lamp can be used.

The ultraviolet irradiation device 4 may be located inside the reactor 1, and the location thereof is not particularly limited as long as it is capable of irradiating at least a part of the photocatalyst device, and the number thereof is a flow rate and the number of the photocatalyst devices. It can select suitably according to.

In this case, ultraviolet rays in a wavelength range of 200 to 400 nm may be irradiated to the photocatalyst device, and hydroxy radicals may be formed by irradiating ultraviolet rays in the wavelength range, and thus, sewage such as wastewater may be treated.

Photocatalyst particles react by irradiation of ultraviolet rays as described above, and the sewage such as wastewater passing through the nanofilter coated with the photocatalyst particles may be purified. In more detail, the raw water introduced through the inlet pipe may be primarily subjected to water treatment through the nano filter forming the outer wall of the photocatalyst device.

Meanwhile, the ultraviolet irradiation device 4 may be further located in the inner space of the tube membrane as shown in FIG. 2. Therefore, when the first treated water passing through the nanofilter layer 7 of the outer wall 8 passes through the nanofilter layer 7 of the inner wall 9, photocatalytic particles coated on the nanofilter layer of the inner wall are positioned in the inner space of the tube membrane. The secondary water treatment may be further made by reacting with the ultraviolet irradiation device, thereby maximizing the efficiency of the water treatment.

The treated water passing through the inner wall may be sent to a discharge pipe connected to the inner wall passage of the photocatalyst device.

Meanwhile, an air blower may be included in the reactor to introduce the raw water and contact the photocatalyst device. The air blower 5 may be located in a direction facing the inlet pipe into which the raw water is introduced, thereby securing the fluidity of the raw water introduced into the reactor, thereby performing a highly efficient water treatment.

Furthermore, the air blower may serve to recycle the raw water of the remainder not processed by the photocatalytic reaction in the reactor, and the raw water of the remaining residue which has passed through the nano-filter 7 by the recirculation may be further treated with water. Efficiency in reducing energy and pressure losses in water treatment can be achieved.

1: reactor
2: inlet pipe
3: photocatalyst device
4: ultraviolet irradiation device
5: air blower
6: delivery pipe
7: Nano filter layer
8: outer wall
9: interior wall

Claims (3)

A reactor 1 comprising a predetermined space;
An inlet pipe 2 through which raw water flows into the reactor;
Located inside the reactor, the cross section is a donut-shaped, a double-walled tube membrane consisting of the inner wall (9) and the outer wall (8), comprising a nano-filter layer (7) coated with photocatalyst particles on the porous support At least one photocatalyst device (3) installed so that at least part of the raw water comes into contact;
At least one ultraviolet irradiation device (4) located inside the reactor and irradiating at least a portion of the photocatalyst particles with ultraviolet rays;
An air blower (5) located in a direction facing the inlet pipe (2) and injecting air to flow the raw water introduced into the reactor (1); And
The treatment water is sent from the reactor (1), located in the direction facing the inlet pipe (2), including a discharge pipe (6) connected to the passage of the inner wall, water treatment apparatus using a photocatalyst. The method of claim 1,
The ultraviolet irradiation device 4
When the treated water passing through the nanofilter layer 7 of the outer wall 8 passes through the nanofilter layer 7 of the inner wall 9, the photocatalytic particles coated on the nanofilter layer of the inner wall may be irradiated by ultraviolet rays. The water treatment device using a photocatalyst, which is further located in the inner wall and the inner space of the tube membrane. The method of claim 1,
The air blower (5)
The raw water of the remainder not treated by the photocatalytic device (3) is recycled inside the reactor (1) to re-supply the raw water of the remainder to the photocatalyst (3).

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