KR100664557B1 - Water treatment equipment using pulsed ultraviolet lamp - Google Patents

Abstract

A water treatment apparatus by using a pulse ultraviolet lamp is provided to decompose peroxide usefully at the waste water having the high turbidity. The water treatment apparatus includes a UV(Ultraviolet) reaction cistern(12). A waste water inflow member(10) transmits the waste water toward the reaction cistern. A waste water discharge member(15) discharges the waste water. A medicine injection device(11) injects sulfuric acid, sodium hydroxide and hydrogen peroxide so that the injected substances decompose the organic matters by the UV. A power supply(13) supplies the pulse type power into a UV lamp. A control member(14) controls entirely the devices.

Description

WATER TREATMENT EQUIPMENT USING PULSED ULTRAVIOLET LAMP}

1 is a block diagram of a water treatment apparatus using a pulse UV lamp according to the present invention,

2 is a detailed view of the water treatment apparatus of FIG.

Explanation of Signs of Major Parts of Drawings

10: wastewater inlet 11: chemical injection equipment

12: UV reactor 13: power supply

14: control equipment 15: wastewater outlet

31: lamp fixing device

The present invention relates to a water treatment apparatus using a pulsed ultraviolet lamp, and more particularly, to a water treatment apparatus using a pulsed ultraviolet lamp that emits high power, high permeability pulse ultraviolet light.

Due to the diversification of industrial structure, the generation of hardly decomposable industrial wastewater is increasing, and the necessity of treatment techniques for effectively treating it is increasing. As part of chemical treatment technology for the treatment of hardly decomposable substances, an oxidation process combining hydrogen peroxide and UV has been developed.

UV and UV light has a wavelength of about 100 nm to 400 nm that is longer than X-ray and shorter than visible light in the wavelength range. Vacuum, short wave UV (UVC), middle wave UV (UVB), can be classified as long wave UV (UVA). (See picture below)

<Wavelength distribution by type of UV>

In the case of Vacuum UV, most of the process is blocked by air or water, and permeation is performed only in the vacuum, so it reacts with oxygen to generate ozone. Due to the limitation of transmission, the application is extremely limited. UVC has a wavelength of 253.7nm, which is known to be the most effective for sterilization, and it is the most widely used UV area for water treatment because it contains a wavelength of 180 ~ 280nm which is useful for decomposing hydrogen peroxide to generate hydroxyl radicals. can do. Particularly, in the case of 253.7 nm, most of the ultraviolet disinfection lamps use lamps that emit 253.7 nm. UVB and UVA are rarely applied directly to water treatment and are sometimes used with photocatalysts that are active in such long wavelengths of UV.

As a method of treating water or wastewater using such UV, a water treatment method using a low pressure mercury lamp and a water treatment method using a medium pressure mercury lamp are used. Water treatment technology using low pressure mercury lamps uses lamps that fill mercury gas at low atmospheric pressures of about 0.007 torr (standard lamps) to 0.76 torr (low pressure high powers) and generate up to about 40% of 254 nm light. One of the most commonly used lamps is also called a standard lamp. In general, mercury lamps have a power output of about 15-60 W and a low power range, which is extremely limited in applications such as homes or experiments, which limits their commercialization. Has been. As a result, many lamp manufacturers and application companies are gradually increasing the power output. Currently, low-voltage high-power lamps of more than 120W are generally used for sterilization, and have been shown as lamps capable of outputting up to 320W. The length of the lamp varies from about 1.2 to 2 m, and there is a disadvantage that a separate cooling device is required at high power because the surface temperature of the lamp reaches 120 to 200 ° C.

In the case of medium pressure mercury lamps, the filling gas is the same as mercury, but the lamp is manufactured to produce several hundred-thousands of thousands of W, which is much higher than the low pressure mercury lamp by greatly increasing the filling pressure to 300 torr or more. However, due to the UV reabsorption of mercury gas, the generation efficiency of UVC is greatly reduced, and the overall UVC generation efficiency including sterilization wavelength is 15% or less. In addition, since the surface temperature of the lamp is 600-800 ℃, a facility for supplying a large amount of cooling water to cool the lamp is added to increase the cost of the facility, there is a problem that the maintenance cost also increases as the lamp life is short.

In addition, although the medium-pressure mercury lamp has an increased output compared to the low-pressure mercury lamp, the transmission length is still short and there is a limit to commercialization. The reason is that the UV penetration rate is proportional to the UV lamp output, but it is difficult to secure a transmission distance of more than 10 cm by the medium pressure mercury lamp. In this case, enormous equipment costs are required, and the cooling devices that need to be installed for each lamp also increase.

Therefore, there is a continuing need for new systems that provide much higher lamp output than medium pressure mercury lamps and also require no cooling.

It is an object of the present invention to provide a system for treating wastewater by decomposing peroxides using pulsed ultraviolet light.

It is still another object of the present invention to provide a system for treating wastewater by decomposing peroxides using a UV lamp that emits short-wavelength pulsed ultraviolet radiation.

It is still another object of the present invention to provide a system for treating wastewater by decomposing peroxides using a UV lamp that emits short-wavelength pulsed ultraviolet rays but does not have reabsorption of UV.

Still another object of the present invention is to provide a wastewater treatment system capable of spontaneous cooling while decomposing peroxides by emitting pulsed ultraviolet rays using a UV lamp.

In order to achieve the above object, the present invention provides a method of treating wastewater by decomposing peroxide by radiating pulsed ultraviolet rays.

In the present invention, the pulsed ultraviolet light is generated by applying a pulse wave power to the ultraviolet lamp. The pulse waveform power source can be generated using a method known to those skilled in the art. In one embodiment of the invention, the pulse type power is generated after the electrical energy supplied by the DC power supply is accumulated in the capacitor, the current of high energy stored in the capacitor is converted into a pulse waveform by a pulse generator, Pulsed ultraviolet rays are generated by being applied to the ultraviolet lamp. In another embodiment of the present invention, the pulse wave power may be generated by driving a power supply capable of generating pulse wave power to an ultraviolet lamp. Power supplies capable of generating pulse wave power can be purchased and used commercially, and can be purchased and used through customized production according to required characteristics.

In the present invention, it is preferable that the pulse wave power applied to the ultraviolet lamp is configured to increase the intensity of light generated from the lamp and to increase the generation rate of short wavelength ultraviolet rays, preferably ultraviolet rays of 180 to 250 nm. Do. Although not limited in theory, when the output of the lamp is increased, a lot of short-wavelength UV light is generated, and thus it is easy to act on the decomposition of peroxide and / or wastewater.

In the present invention, when the pulse wave power is applied to the ultraviolet lamp, when the voltage is high, it may generate a larger output than when using a low voltage, it is recommended to use the voltage up within the limit that the lamp can withstand desirable. In the practice of the invention, it is preferable to use a voltage of 1000V to 3000V so that the voltage can provide a sufficient output. If the power is lowered, the output will be lowered to obtain a sufficient output. If the power is too high, the lamp used will be overloaded. In one preferred embodiment of the invention, the voltage is preferably to use a voltage of 1000V or more, more preferably 1500V or more.

In the present invention, when a pulse waveform power is applied to the ultraviolet lamp, a large output can be generated when the current increases, so it is preferable to use a momentary peak current as large as the power supply can generate. It is desirable to use a current between 1000 and 1500 A to provide sufficient power for wastewater treatment in the generated UV to increase the amount of useful UVC. In a preferred embodiment of the invention, it is preferable that the current is a momentary peak current of about 1200 A.

In the pulsed power supply according to the present invention, when the width of the pulse is narrow, the peak value of the pulse is increased at the same energy, and the efficiency of the UV is increased to serve to increase the distribution of the UVC. In the practice of the invention, it is desirable to maintain a pulse width of 100 mW-250 mW to provide sufficient power for wastewater treatment in the generated UV to increase the amount of useful UVC. If the pulse width is too wide, the efficiency decreases. If the pulse width is too narrow, the output decreases. In one preferred embodiment of the invention, the width of the pulse is preferably about 150 Hz.

In the pulsed power supply according to the present invention, the frequency of the pulse can be adjusted in consideration of the environment in which the ultraviolet lamp is used, it is preferable to use in the range that the temperature of the lamp can be naturally cooled. In one preferred embodiment of the invention, the pulse is preferably adjusted to about 10 times per second.

In the present invention, the UV lamp is preferably made of a material having good transmission efficiency, preferably quartz or sapphire, and can be molded in various forms according to the use environment. In the practice of the present invention, the ultraviolet lamp is filled with an inert gas to prevent the reabsorption of the generated UV to generate a large amount of UV. In one embodiment of the invention, the preferred inert gas is preferably prepared by filling xenon or krypton. In the present invention, the xenon or krypton gas filled in the ultraviolet lamp can increase the filling pressure because there is no reabsorption phenomenon even if the amount of the filling gas is increased, but in order to achieve the same ultraviolet efficiency when the filling pressure is high Since a large output power supply is required, it is preferable to use it at a pressure of about 500-1000 Torr.

In the present invention, the peroxide is not particularly limited as long as it can be decomposed by ultraviolet light to form radicals and react with organic substances to decompose the pollutant. Preferably hydrogen peroxide. In the practice of the invention, when irradiated with ultraviolet light in the waste water the hydrogen peroxide and a proton is added to the waste water react in a molar daemol the OH radical of 2 moles is generated, the generated OH radical is hydrogen _{^{peroxide, HCO 3 -, CO 3 2}} - , O ₂ ^-, it is a chain of organic material and the reaction with the oxidation reaction to be up to the chain decomposition of organic matter.

In another aspect, the present invention provides a method in which pulsed ultraviolet light directly decomposes and removes a pollutant. Peroxide is easily decomposed by UV and can be used as a medium for decomposing pollutants, but ultraviolet light itself can decompose pollutants.

 The present invention provides a system for treating wastewater by decomposing peroxides by generating pulsed ultraviolet rays in another aspect.

The wastewater treatment system according to the present invention includes a UV reactor equipped with a UV lamp, and the UV reactor is installed with an entrance through which wastewater flows in and the treated wastewater flows out. The UV reactor may be equipped with a pulsed UV lamp, and one or more lamps may be installed in consideration of the length of the ultraviolet ray transmitted and the size of the UV reactor. Preferably, it is preferable to install one lamp in the center so that UV is irradiated to the UV reactor as a whole.

The wastewater treatment system according to the present invention is preferably provided with a pH controller to adjust the pH of the wastewater flowing into the UV reactor or the treated wastewater discharged. The pH adjusting agent may be made of a combination of acidic and basic drugs, it is preferable to adjust the pH using a strong acid and a strong base. In a preferred embodiment, the pH adjusting agent is sulfuric acid and sodium hydroxide.

In the present invention, the wastewater treatment system includes a device for introducing peroxide, preferably hydrogen peroxide, which is decomposed by pulsed ultraviolet rays. The dosage of hydrogen peroxide can be determined according to the concentration of the waste water.

The wastewater treatment system according to the present invention can treat wastewater in a batch, semibatch, or continuous manner, and it is preferable to use a continuous wastewater treatment method to treat a large amount of wastewater.

In the wastewater treatment system according to the present invention, it is preferable that a power supply for applying pulse power to a UV lamp installed in a UV reactor is installed.

The wastewater treatment system according to the present invention preferably further includes a control unit capable of adjusting the amount of wastewater flowing into the UV reactor, the amount of wastewater flowing out, the UV lamp, the power supply, the pH, and the amount of peroxide.

Hereinafter, the contents of the present invention will be described in detail with reference to the accompanying drawings. 1 shows a system for applying a high power pulsed ultraviolet lamp according to the invention to wastewater or sewage treatment.

The system shown in FIG. 1 is provided with a UV reactor 12, a wastewater inlet 10 for introducing wastewater into the reactor and a wastewater outlet 15 for discharging wastewater. Supplying pulse type power to chemical input equipment 11 and UV lamp for inputting chemicals for controlling pH of wastewater discharged therein, for example, sulfuric acid, hydrogen peroxide and hydrogen peroxide to decompose organic matter. The power supply 13 and the control unit 14 for controlling them are included.

According to the detailed view shown in FIG. 2, when the UV reactor is examined in detail, the hydrogen peroxide is mixed and the wastewater in which the pH is adjusted to an appropriate range is introduced (20) and introduced into the reactor through the inlet baffle 21 installed at the bottom of the reactor. . Hydrogen peroxide is decomposed by ultraviolet rays irradiated around the point 22 where the pulsed UV lamp is installed, and a large amount of OH radicals are generated to oxidize and remove the organic material. In one reactor, the number of lamps can be adjusted according to the type and characteristics of the wastewater, and the number of reaction tanks through which the wastewater introduced once can be adjusted according to the required residence time. The wastewater treated via the UV reactor is passed back through the upper baffle 23 into the next reactor or through the outlet 26 back into the next process or discharged. The power supply 40 for operating the lamp installed in the reactor may be attached to the upper part of the reactor or may be arranged in a separate space. The power supply to the lamp is supplied to the lamp via the power line 42 through the discharge portion 41 at the rear of the power supply. The shape and structure of the reactor are designed for the operation of the pulsed UV lamp, and the number of lamps and the specifications of the reactor can be varied depending on the installation location and the characteristics of the target wastewater.

Example 1

In the device shown in the drawings, a pulse wave power source is maintained at about 1,800 V, instantaneous current about 1,000 A, 150 μsec operating time, and 10 operating cycles per second using a pulsed power supply in a UV lamp filled with xenon. Was applied.

Example 1 is shown in Table 1 below as an experimental result of applying the water treatment apparatus according to the present invention to D steelmaking wastewater.

Table 1

division COD-Mn (mg / L) COD-Cr (mg / L) Influent 62.2 128 Runoff 6.1 11.2 Removal efficiency (%) 90.2 91.2

As shown in Table 1, the removal rate was about 90.1% for COD-Mn and about 91.2% for COD-Cr.

Example 2

Example 2 is to apply the D semiconductor wastewater to the water treatment apparatus according to the present invention, the test results are shown in the following table.

division COD-Cr (mg / L) Influent 141 Runoff 19.3 Removal efficiency (%) 86.3

As shown in the table above, about 86.3% of the COD-Cr was removed through the device. The above embodiment is not merely limited to a specific wastewater as an application example of this water treatment apparatus.

According to the present invention, there is provided a system for treating wastewater using pulsed ultraviolet rays or for treating wastewater by decomposing peroxides using pulsed ultraviolet rays. Such a system provides a high power output compared to the medium pressure mercury lamp and provides a wastewater treatment system that does not require separate cooling equipment because of natural cooling during operation.

Also provided by the present invention is a UV lamp that emits pulsed ultraviolet radiation containing a large amount of UVC. These lamps show a high amount of UVC generation, which is a useful area for wastewater treatment, and shows high wastewater treatment efficiency even under the same conditions.

In addition, the present invention reduces the number of lamps required per unit volume of wastewater or sewage to be treated, and also eliminates the need for a cooling device, thereby reducing the cost of treating the same wastewater, thereby competing with other wastewater treatment methods. This was secured.

Claims (12)

Pulsed power is applied to a UV lamp to generate pulsed ultraviolet light, and the wastewater is treated by decomposing peroxide in the wastewater using the same. delete The method of claim 1, wherein the power of the pulse waveform is generated using a pulsed power supply. The water treatment method according to claim 1 or 3, wherein the power supply of the pulse waveform uses a voltage of 1000V to 3000V. The water treatment method according to claim 1 or 3, wherein the pulse wave power source uses an instantaneous peak current of 1000 A to 1500 A. The water treatment method according to claim 1 or 3, wherein the pulse waveform has a width of 100 Hz to 250 Hz. The water treatment method according to claim 1, wherein the ultraviolet lamp is filled with an inert gas. 8. The water treatment method according to claim 7, wherein the inert gas is xenon or krypton. The method of claim 7 or 8, wherein the inert gas is 500-1000 Torr. Wastewater entry and exit, UV reactor, UV lamp, power supply for providing pulsed wave power to the lamp, peroxide and pH regulating agent and control, wherein the power supply is 1000 V to 3000 v voltage, 1000 A to 1500 A A water treatment system that provides a peak current pulse waveform power supply. The water treatment system of claim 10, wherein the ultraviolet lamp is filled with a gas of xenon or krypton at a pressure of 500-1000 torr. The water treatment system according to claim 10, wherein the peroxide is hydrogen peroxide.

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