KR100224642B1 - Injection type reactor for treating wastewater by using an electron beam - Google Patents

Abstract

Disclosed is an injection type reactor for wastewater treatment using an electron beam that can be irradiated to an electron beam in a state in which the wastewater is injected, thereby improving the electron beam reaction efficiency and treating a large amount of wastewater. The disclosed spray reactor includes: a reaction tank installed at the bottom of an electron beam accelerator and introducing the wastewater therein; A nozzle installed at an upper portion of the reaction tank and spraying the wastewater to an appropriate thickness through which the electron beam can pass according to the energy of the electron beam into the reaction tank; And a wastewater discharge port installed at one side of the reactor to discharge the wastewater irradiated to the electron beam. In addition, a ridge-shaped partition plate is installed inside the reaction tank so that the wastewater irradiated with the electron beam can react with the scattered electron beam again, and a bubbling device is provided for blowing ozone generated by the electron beam accelerator into the wastewater inside the reactor. . According to the present invention, the electron beam reaction efficiency and the electron beam utilization rate is increased, it is possible to suppress the ozone emission to the air as much as possible, and it is possible to treat a large amount of wastewater.

Description

Injection reactor for wastewater treatment using electron beam

The present invention relates to a wastewater treatment apparatus for treating various industrial wastewater containing contaminants by electron beam irradiation, and more particularly, to increase the electron beam reaction efficiency by allowing the electron beam to be irradiated in the state in which the wastewater is sprayed. The present invention relates to a spray reactor for wastewater treatment using an electron beam capable of treating wastewater.

Conventional wastewater treatment forms are treated in a complex manner through the basic processes such as purification, precipitation, filtration and chemical and biological treatment steps from the site of generating wastewater, but the reality is that it does not achieve satisfactory results.

In general, a method of treating wastewater containing a large amount of pollutants such as hardly decomposable organic substances is usually performed by chemical treatment and then biological treatment (active sludge treatment). The treatment method is primarily chemical neutralization by acid and alkali chemicals, and absorbs, precipitates, or floats BOD, COD, and other heavy metal substances in wastewater using various organic and inorganic flocculants. Go through the treatment process.

In general, the removal efficiency of BOD, COD and chromaticity is about 60% in the first chemical treatment, and the treatment in the second process, biological treatment (active sludge treatment), is at the emission limit level. Biological treatment is a method of removing organic substances from wastewater by using aerobic or anaerobic microorganisms. However, if it is difficult to comply with the emission limits after biological treatment, the biological treatment process must be repeated or secondary chemical treatment must be performed.

However, such a conventional method requires a large amount of chemicals and takes a long time for biological treatment, and thus, it is difficult to obtain an organic material removal efficiency over a certain limit due to a considerable problem of facility cost and operation burden to reach the emission limit.

In order to solve such a problem of the prior art, various methods have been introduced, and among them, a chemical treatment method by ozone oxidation is used in various wastewater treatment sites for the treatment of wastewater containing hardly decomposable organic substances. The ozone oxidation method is excellent in oxidation and sterilizing power for organic materials, but requires a lot of costs due to the use of ozone.

Recently, industrial wastewater treatment methods using electron beam accelerators have been proposed. The wastewater treatment method by the electron beam accelerator can enhance the wastewater treatment efficiency by irradiating the electron beam to industrial wastewater and effectively decomposing various heavy metals or hardly decomposable substances in the wastewater which have low removal efficiency in the wastewater treatment by the conventional biochemical method. There is an advantage.

1 is a schematic configuration diagram of a wastewater treatment apparatus using the above-described electron beam.

Referring to FIG. 1, the wastewater treatment apparatus includes an electron beam accelerator 130, an electron beam reactor 110 containing wastewater to irradiate an electron beam generated from the electron beam accelerator, and bubbling to bubble the wastewater. The device 120 and a settling tank 140 for basically depositing and removing contaminants in the wastewater.

In the wastewater treatment process using the wastewater treatment device, the wastewater containing contaminants is introduced into the electron beam reactor 110, and the bubbling gas is blown into the wastewater through the bubbling device 120 to bubble the electron beam accelerator. Irradiating the electron beam generated from the 130 is subjected to an electron beam irradiation step of changing the contaminants in the waste water to a state that is easy to remove. Here, the bubbling gas allows the electron beam to be efficiently irradiated deeply into the wastewater, and the electron beam decomposes or oxidizes the contaminants in the wastewater so that it can be easily removed or changed into a harmless component. Will change. Next, the contaminants thus changed are precipitated in the settling tank 140 and subjected to the precipitation removal step of removing the sludge. At this time, a flocculant is generally added before or after the electron beam irradiation step in order to aggregate and quickly settle the pollutants irradiated on the electron beam. In addition, although not shown in some cases, after the electron beam irradiation may be subjected to a filtration process or a biological treatment process.

On the other hand, the electron beam reactor 110 used in the above-described conventional wastewater treatment apparatus using an electron beam has a structure capable of simply flowing the wastewater. That is, after introducing wastewater from one side of the electron beam reactor 110 to flow therein, the wastewater irradiated to the electron beam through the other side or the bottom is discharged. Therefore, when a large amount of wastewater flows into the electron beam reactor 110 to treat a large amount of wastewater, the flow thickness of the wastewater becomes thick. By the way, the electron beam having energy of 1 ~ 2 MeV class for industrial use is about 4 ~ 10mm (about 4mm for 1 MeV, about 8mm for 2 MeV) of wastewater, There is a problem that the electron beam does not reach. Therefore, in the method of bubbling while flowing the wastewater to the electron beam reactor 110, since the depth of the wastewater that can penetrate as an electron beam of 1 MeV is only 4 mm, the wastewater of about 4,000 m 3 per day may be treated with an electron beam accelerator of about 80 KW. To do this, electron beams can be uniformly irradiated on the entire wastewater only by bubbling for several tens of seconds or more.

If the conventional electron beam reactor 110 is irradiated with a high power electron beam for a short time within 1 second, while a large amount of electron beam is irradiated only to the wastewater corresponding to a depth of 4mm above the wastewater, Since the wastewater is not irradiated at all, the continuous bubbling does not simply mean that all wastewater receives the average absorbed dose of energy from the electron beam, and in fact, the amount of wastewater treated by the electron beam will only be a small amount.

In addition, in the conventional electron beam reactor 110, when it is desired to treat a large amount of wastewater, it is difficult to quickly increase the flow rate in addition to simply increasing the thickness of the wastewater flowing into the electron beam reactor 110. The reason for this is the friction between the wastewater and the bottom of the electron beam reactor 110, in which case the electron beam is irradiated only on the surface of the wastewater as described above.

As described above, the efficiency of removing pollutants in the waste water is not satisfactory in the conventional electron beam reactor 110, and the electron beam is directly irradiated on the wall surface of the electron beam reactor 110, so that the electron beam loss occurs. There is a problem that is hard to exceed 70%.

Meanwhile, although not shown, a method of employing a spray reactor has been proposed to compensate for such a problem. The spray reactor is a reactor in which the waste water is made into a small particle spray form and irradiated with electron beams, but the waste water has many opportunities to contact the electron beam and air, but has a disadvantage in that it cannot process a large amount of waste water at once.

The present invention has been made to solve the above problems, wastewater treatment using an electron beam to increase the electron beam reaction efficiency and to treat a large amount of wastewater by being irradiated to the electron beam in the state in which the wastewater is sprayed to a predetermined thickness The purpose is to provide a spray injection reactor.

1 is a schematic configuration diagram of a wastewater treatment apparatus using a conventional electron beam,

2 is a perspective view showing a spray reactor for wastewater treatment according to the present invention;

3 is an exploded perspective view of the bubbling device shown in FIG.

4 is a cross-sectional view of the nozzle shown in FIG.

5 is a cross-sectional view of the spray reactor shown in FIG.

6 is a longitudinal sectional view of the spray reactor shown in FIG. 2;

Explanation of symbols for the main parts of the drawings

110 ... electron reactor 120,220 ... bubbling device

130.Electron Beam Accelerator 131 ... Electron Beam Drawer

140 ... sedimentation tank 210 ... injection reactor

211 Reactor 212 ...

213 Bracket 214 Holder

221 Bubbles 222

223 Supply pipe 250 Nozzle

251 Waste water introduction 252 Nozzle body

253 Nozzle tip 254 Waste water jet

255 Wastewater outlet 261 Wastewater outlet

In order to achieve the above object, the injection reactor for wastewater treatment using an electron beam according to the present invention is installed at a lower portion of the electron beam accelerator at a predetermined interval with a lower end of the electron beam accelerator, and the wastewater is introduced into the inside and irradiated to the electron beam. Reactor; At least one nozzle installed in an upper portion of the reaction tank and spraying the wastewater to an appropriate thickness through which the electron beam penetrates in accordance with the energy of the electron beam; And a wastewater discharge port installed at one side of the reactor to discharge the wastewater irradiated to the electron beam.

And it is provided in the inside of the reactor, and provided with a plate-shaped ridged partition plate inclined to both sides from the center, the waste water sprayed by the nozzle irradiated to the electron beam along the inclined surface of the ridged partition plate It is desirable to be able to react with the scattered electron beam as it flows down.

Two nozzles are provided to face each other at a predetermined distance, and the two nozzles are preferably disposed so that the waste water injected from each of them can meet and fall below the inside of the reactor at a flow rate of approximately 2.5 m / s. .

Here, the nozzle includes a tubular wastewater introduction portion for introducing wastewater, a nozzle tip portion having a narrow and long cross section for injecting the wastewater, and a nozzle body portion connecting the wastewater introduction portion and the nozzle tip portion, and the nozzle It is preferable that the cross-sectional area of the wastewater inlet formed in the wastewater introduction section of is substantially the same as that of the wastewater injection port formed in the nozzle tip.

In addition, a bubbling device is further provided to blow ozone generated by the electron beam accelerator into the wastewater inside the reactor. Here, the bubbling device is a supply pipe for supplying the ozone mixed with air from the outside of the reaction tank to the inside of the reaction tank, and the ozone connected to the supply pipe and installed inside the reaction tank and supplied through the supply pipe It is preferable that the at least one bubbler for bubbling in the wastewater, so that the ozone can be effectively absorbed in the wastewater.

The waste water outlet is installed so as to protrude a predetermined height from the bottom surface of the reaction tank to maintain the waste water inside the reaction tank, it is preferable to be able to effectively absorb the ozone.

Therefore, according to the present invention, the electron beam reaction efficiency and the electron beam utilization rate are increased, the ozone emission to the air can be suppressed as much as possible, and a large amount of wastewater can be treated.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the injection reactor for wastewater treatment using an electron beam according to the present invention.

Figure 2 is a perspective view showing a spray reactor for wastewater treatment according to the present invention, Figure 3 is an exploded perspective view of the bubbling device shown in Figure 2, Figure 4 is a cross-sectional view of the nozzle shown in FIG.

First, according to FIG. 2, the injection reactor 210 for wastewater treatment using an electron beam according to the present invention includes a reaction tank 211, a nozzle 250 installed on an upper portion of the reaction tank 211, and a reaction tank 211. It is provided with a waste water discharge port (not shown) installed on one side. And it is preferable to further provide a ridged partition plate 212 and the bubbling device 220.

The reaction tank 211 is installed at a lower end of the electron beam accelerator, that is, at a predetermined interval with an electron beam drawing window (not shown). A rectangular opening is formed in the upper portion of the reaction tank 211 according to the narrow and long shape of the electron beam extraction window. Waste water containing contaminants is introduced into the reaction tank 211, and the waste water is irradiated by an electron beam generated from an electron beam accelerator (not shown) installed above the reaction tank 211 to oxidize or decompose the pollutants. The reaction will take place.

The nozzle 250 is installed on the upper portion of the reaction tank 211 and serves to spray wastewater into the reaction tank 211. The nozzles 250 are installed one by one on both sides of the upper portion of the reaction tank 211 so as to face each other at a predetermined distance, and are preferably installed to be detachable for easy cleaning. Therefore, the electron beam generated from the electron beam accelerator can be irradiated to both the wastewater sprayed from the two nozzles 250.

The nozzle 250 has a tubular wastewater introduction portion 251 for introducing wastewater, a nozzle tip portion 253 having a narrow and long cross section for spraying the wastewater, the wastewater introduction portion 251 and the nozzle tip portion ( It consists of a nozzle body 252 for connecting the 253. As shown in FIG. 3, the height of the nozzle 250 is gradually lowered from the wastewater introduction portion 251 toward the nozzle tip portion 253 via the nozzle body 252. On the other hand, the length thereof becomes longer and longer toward the nozzle tip portion 253.

Here, it is preferable to make the cross-sectional area of the wastewater inlet 255 formed in the wastewater introduction part 251 equal to the cross-sectional area of the wastewater injection port 254 formed in the nozzle tip portion 253.

Therefore, since the flow rate, pressure, and flow rate of the wastewater introduced into the wastewater inlet 255 are maintained even when sprayed through the wastewater injection port 254, the wastewater injection port (by adjusting the pressure of the wastewater on the wastewater inlet 255 side). It is possible to adjust the flow rate of the waste water sprayed through 254, thereby controlling the desired amount of wastewater treatment, and can also process a large amount of wastewater.

The nozzle 250 sprays the wastewater to an appropriate thickness through which the electron beam can penetrate according to the energy of the electron beam. That is, when the energy of the electron beam is approximately 1 MeV, since the permeable depth of the wastewater is about 4 mm, the thickness of the wastewater sprayed by making the height of the wastewater injection port 254 formed in the nozzle tip portion 253 about 4 mm is about 4 mm. When the energy of the electron beam is about 2 MeV, the permeable depth of the wastewater is about 8 mm, so that the wastewater injection port 254 has a height of about 8 mm, so that the thickness of the waste water is about 8 mm.

Therefore, since the electron beam is irradiated to the entire wastewater sprayed from the nozzle 250, the energy of the electron beam is transmitted to all parts of the wastewater, thereby increasing the reaction efficiency of the electron beam. In this case, the energy absorbed dose of the electron beam irradiated to the wastewater can be regarded as the average radiation dose converted from the output of the electron beam irradiated to the wastewater.

Wastewater discharge port (not shown) is installed on one side, preferably the bottom surface of the reaction tank 211 serves to discharge the wastewater irradiated to the electron beam.

The ridged partition plate 212 is installed inside the reaction tank 211 and has a plate shape inclined to both sides from the center thereof. In more detail, the ridged partition plate 212 has two plate members inclined with each other at one edge thereof to be inclined with each other, and has a shape in which the portion is fixed by the bracket 213. Such a ridged split plate 212 is sprayed by the nozzle 250 and the primary wastewater irradiated to the electron beam flows along the inclined surface of the ridged split plate 212 and the second scattered electron beam To react with

Therefore, the energy of the irradiated electron beam is almost completely absorbed by the wastewater, so that the utilization rate of the electron beam can be more than 90%.

In addition, the ridged partition plate 212 also serves to prevent unabsorbed ozone from directly contacting the wastewater injected from the nozzle 250, as will be described later.

In addition, the ridged partition plate 212 may be installed to be detachable from the inside of the reaction tank 211, for cleaning the inside of the reaction tank 211. To this end, a holder 214 is installed on an inner wall of the reactor 211, and the ridged partition plate 212 is supported by the holder 214.

On the other hand, the cooling air for cooling the electron beam withdrawal window of the electron accelerator accelerator contains a high concentration of ozone generated by the electron beam, and when released into the atmosphere may cause a harmful situation to the human body it needs to be collected and treated separately.

To this end, the present invention is provided with a bubbling device 220 to blow the ozone into the reaction tank 211 to be absorbed in the waste water. The bubbling device 220 that serves as described above is connected to the supply pipe 223 and the supply pipe 223 for supplying ozone mixed with air from the outside of the reaction tank 211 to the inside of the reaction tank 211. It is provided with one or two bubblers 221 installed inside the reactor 211 to bubble the ozone supplied through the supply pipe 223 into the waste water. Referring to FIG. 4, the bubbler 221 is made of a breathable material, and a hollow portion 222 is formed therein, and the supply pipe 223 is inserted into one side of the hollow portion 222.

Therefore, since the ozone introduced into the hollow portion 222 through the supply pipe 223 is uniformly bubbled into the wastewater through the bubbler 221, the amount of ozone effectively absorbed into the wastewater and released into the atmosphere can be minimized. Will be.

However, when the ozone is not absorbed into the wastewater and comes into contact with the wastewater sprayed from the nozzle 250, the ozone-type partition plate 212 may have an adverse effect on the wastewater treatment of the electron beam irradiation process. Unabsorbed ozone in the wastewater is prevented from directly contacting the wastewater sprayed from the nozzle 250.

5 is a cross-sectional view of the spray reactor shown in FIG. 2.

Referring to FIG. 5, the reactor 211 of the spray reactor according to the present invention is installed at a predetermined distance (for example, about 40 cm) from the electron beam withdrawal window 131 of the electron accelerator. The upper part of the reaction tank 211 is installed so as to face each other at a predetermined interval (for example, about 80cm) so that the two nozzles 250 are not directly irradiated on the electron beam, the inside of the reaction tank 211, ridged partition plate 212 ) Is installed about 40 cm below the waste water injection port 254 of the nozzle 250. In the lower portion of the reaction tank 211, a bubbler 221 and a wastewater discharge port 261 are provided.

The waste water outlet 261 is installed to protrude a predetermined height from the bottom surface of the reaction tank 211 to maintain the waste water inside the reaction tank 211 to a predetermined depth. Therefore, the bubbler 221 is installed between the upper end of the wastewater outlet 261 and the bottom surface of the reaction tank 211, and the bubbling ozone can be effectively absorbed in the wastewater, thereby reducing the amount of ozone released into the atmosphere. The amount can be minimized.

5 shows a trajectory according to the flow rate of the wastewater sprayed from the nozzle 250. a1 and a2 represent the trajectories of wastewater with a flow rate of 1.57 m / s, b1 and b2 represent the trajectories of wastewater with a flow rate of 2.5 m / s, and c1 and c2 with a flow rate of 5 m / s. In order to treat 4,000 m3 of wastewater per day with an electron beam having an energy of 1 MeV, the wastewater injection port 254 has a cross-sectional area of 4 mm in height and 2,200 mm in length. The flow rate of the injected waste water will have approximately 2.5 m / s.

The electron beam lead-out window 131 is generally rectangular with a width of 7 cm and a length of 180 cm. The beam width of the electron beam irradiated through the electron beam extraction window 131 proceeds downward and gradually widens. In the case of a general accelerator, the scanning speed of the electron beam is maintained so that the distribution of the electron beam can be maintained even if it is moved to both sides from the centerline in the beam. Is adjusted.

Therefore, in order to treat the wastewater of 4,000 m 3 per day under the above conditions, and to efficiently irradiate the electron beams, the two nozzles 250 are discharged from each of the reactors 211 at a flow rate of approximately 2.5 m / s. It is preferable to be disposed so as to meet at the center portion, that is, directly below the electron beam drawing window 131, and fall down.

6 is a longitudinal cross-sectional view of the spray reactor shown in FIG. 2.

Referring to FIG. 6, as described above, the length of the electron beam extraction window 131 is usually 180 cm. The beam width of the electron beam irradiated through the electron beam extraction window 131 proceeds downward and gradually widens so that the beam width becomes approximately 220 cm at the height of the waste water injection port 254 of the nozzle installed on the upper portion of the reaction tank 211. Therefore, the length of the waste water injection port 254 of the nozzle is also preferably 220cm.

As described above, the injection reactor for wastewater treatment according to the present invention has the following effects. First, since the electron beam is irradiated in the state of spraying the wastewater to a thickness that the electron beam can penetrate, the electron beam can be irradiated to all parts of the wastewater, the electron beam reaction efficiency is increased. Second, the wastewater irradiated to the electron beam can react with the scattered electron beam secondarily by the ridge-shaped partition plate, which increases the electron beam utilization rate. Third, since the harmful ozone generated by the electron beam is sufficiently absorbed in the wastewater, the emission of ozone into the air can be suppressed as much as possible. Fourth, it is possible to adjust the flow rate of the wastewater can be treated a large amount of wastewater.

Claims (8)

In a spray reactor for wastewater treatment using an electron beam for treating wastewater containing contaminants using an electron beam generated from an electron beam accelerator: A reaction tank installed at a lower portion of the electron beam accelerator at a predetermined interval with a lower end of the electron beam accelerator, and the waste water is introduced therein and irradiated to the electron beam; At least one nozzle installed in an upper portion of the reaction tank and spraying the wastewater to an appropriate thickness through which the electron beam penetrates in accordance with the energy of the electron beam; And And a wastewater discharge port installed at one side of the reactor to discharge the wastewater irradiated to the electron beam. The method of claim 1, It is installed detachably in the reaction tank and has a plate-shaped ridge-shaped partition plate which is inclined to both sides from the center thereof, and the waste water sprayed by the nozzle and irradiated to the electron beam is provided on the inclined surface of the ridge-shaped partition plate. Spraying reactor for wastewater treatment using an electron beam, characterized in that it can react with the scattered electron beam while flowing down again. The method of claim 1, The nozzles are positioned to face each other at a distance not exposed to the electron beam emitted from the electron accelerator, and the flow rate of the wastewater is determined so that the wastewater injected from each of them meets at the center of the reactor and falls down. Injection reactor for wastewater treatment using an electron beam. The method according to claim 1 or 3, The nozzle includes a tubular wastewater introduction portion for introducing wastewater, a nozzle tip portion having the same cross section as the wastewater introduction portion for injecting the wastewater, and a nozzle body portion connecting the wastewater introduction portion and the nozzle tip portion. Injection reactor for wastewater treatment using an electron beam. The method of claim 4, wherein When the energy of the electron beam is approximately 1 MeV, the height of the wastewater jetting port formed in the nozzle tip is substantially 4 mm so that the substantial thickness of the wastewater is 4 mm. The method of claim 4, wherein When the energy of the electron beam is approximately 2 MeV, the height of the waste water injection port formed in the nozzle tip is substantially 8mm so that the substantial thickness of the wastewater is 8mm, the injection type reactor for wastewater treatment using an electron beam. The method of claim 1, A supply pipe for blowing ozone generated by the electron beam accelerator into the wastewater inside the reactor, and supplying the ozone mixed with air to the inside of the reactor from the outside of the reactor, and connected to the supply pipe and inside the reactor And a bubbling device comprising a bubbler made of at least one breathable material bubbling the ozone supplied through the supply pipe into the wastewater. The method of claim 7, wherein The waste water outlet is installed so as to protrude a predetermined height from the bottom surface of the reaction tank to maintain the waste water in the reaction tank, the absorption of the ozone is characterized in that the absorption of the ozone can be made effectively. Spray reactor.

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