KR20120097138A - Plasma deodorizer for waste water treatment - Google Patents

Abstract

PURPOSE: A plasma-based bad odor reducing apparatus for a sewage treating plant is provided to reduce the ozone concentration of exhaust gas and to simplify the structure of the apparatus by omitting an ultraviolet ray lamp. CONSTITUTION: A plasma-based bad odor reducing apparatus for a sewage treating plant includes a main processing module(100). The main processing module includes a container(110) and a blower(120). A sucking path(111) and a discharging path(112) are formed in the container. The blower compulsorily introduces gas in the container and compulsorily discharges the gas through the discharging path. Plasma filtering layers(130) and photo-catalytic filtering layers(140) are alternately stacked in the container. A plurality of arc reaction units(132) are arranged in the plasma filtering layers and generate gliding arc. One or more photo-catalytic filters(142) are arranged in the photo-catalytic filtering layers.

Description

Plasma odor reduction device for sewage treatment plant {Plasma deodorizer for waste water treatment}

The present invention relates to a device for reducing plasma odor for sewage treatment plants, and more particularly, to oxidize / decompose and adsorb odorous substances of harmful odorous gases generated in a sewage treatment process of a sewage treatment plant. The present invention relates to a plasma odor reduction device for sewage treatment plants that is suppressed from being discharged.

In general, a large amount of harmful malodorous gas is generated in the sewage treatment plant, and in this field, various types of malodorous treatment devices are installed in the sewage treatment plant to prevent unauthorized release of gas containing harmful malodorous substances around the sewage treatment plant. .

The odor treatment apparatus typically employs methods of oxidizing / decomposing odorous substances by generating low temperature plasma through DBD or corona discharge.

However, the corona discharge method has a lower discharge intensity than the plasma generation, resulting in long gas residence time, fine dust in the processing gas, or oxide by-products generated during the plasma oxidation / reduction reaction. In this case, it was difficult to have continuity of work because the electrical properties were degraded during continuous work.

In addition, the DBD method has been pointed out a problem that the efficiency is lowered because the gap between the discharge electrodes is narrow, the throughput is limited.

Therefore, the plasma odor reduction apparatus for sewage treatment plants using the conventional plasma has been developed and distributed a new type of odor treatment apparatus that can solve the problem of excessive cost caused by operation due to low efficiency and frequent maintenance. There is a great demand.

The object of the present invention devised by the above-mentioned demands is to realize stable deodorization which can be carried out by alternately performing oxidative decomposition and adsorption of malodorous gas introduced from a sewage treatment plant, and oxidative decomposition and adsorption of malodorous gas are carried out. The present invention provides a plasma odor reduction apparatus for a sewage treatment plant that has a convenience in accordance with future maintenance of a plasma processing unit and an adsorption processing unit.

The above object is achieved by the following constitutions provided in the present invention.

Plasma odor reduction device for sewage treatment plant according to the present invention,

An enclosure having an intake passage and an exhaust passage; Comprising the main processing module including a blower forcibly introducing the gas introduced into the enclosure through the intake, and then forcibly discharged through the discharge path,

In the enclosure, a plasma in which a plurality of arc reaction units are arranged in a hollow of a discharge tube having an inlet formed at a rear thereof and an exhaust hole formed at a front thereof is spaced apart from each other to generate a gliding arc through discharge between the discharge electrodes. Filter layers and a plurality of photocatalyst filter layers on which one or more photocatalyst filters are disposed are alternately stacked in multiple stages,

The gas introduced into the enclosure through the intake passage and discharged through the exhaust passage may be configured to remove odorous substances contained in the gas while sequentially passing through the plasma filter layer and the photocatalyst filter layer which are alternately stacked in multiple stages.

Preferably, the arc reaction units are disposed in the cartridge body to form a plasma filter cartridge, respectively enter the cartridge charging portion formed in the housing to form a plasma filter layer, the photocatalyst filter is fixed to the cartridge body to form a photocatalyst filter cartridge And enter a slot formed in the enclosure to form a photocatalyst filter layer.

More preferably, the arc reaction unit, the discharge tube is formed in the inlet port in the front and the exhaust port in the rear; An arc generating unit in which at least two discharge electrodes having an inclined surface are disposed in the hollow of the discharge tube and spaced apart from each other; It is installed to be accommodated in the hollow of the discharge tube is configured to include an induction member surrounding the outside of the arc generating unit,

The induction member is a reticulated pipe body having a plurality of main exhaust holes formed on a side wall, and an inlet communicating with an inlet of a discharge tube is formed at a rear side thereof, and an induction exhaust hole for discharging a part of the gas introduced through the inlet is formed at a front side thereof.

Of the gas flowing into the arc generating unit through the inlet, some of the gas is discharged to the induction exhaust hole formed in the front while gliding the arc generated between the discharge electrode forward to generate a gliding arc, the remaining gas circulates the arc generating unit and then the side wall It is configured to be discharged by switching the direction of travel through the main exhaust hole formed in the side.

In addition, a gas guide piece is disposed at the rear of the discharge electrode to guide and transport the gas circulated to the outside of the arc generator into the arc generator in which the gliding arc is generated.

As described above, in the present invention, a plasma filter layer having a plurality of arc reaction units and a photocatalyst filter layer having a photocatalyst filter are alternately stacked in the enclosure, so that the gas introduced into the enclosure is each arc reaction unit and the photocatalyst filter layer of the plasma filter layer. While repeatedly passing through, odorous substances are oxidized / decomposed by various active reaction particles including electrons, ions, active atoms, molecules, ultraviolet rays, OH radicals, and deodorized and sterilized and discharged. At this time, the arc reaction unit generates specific ultraviolet rays necessary to generate OH radicals by itself, thereby simplifying the structure by eliminating the ultraviolet lamp.

In addition, in the present invention, the plasma filter layer and the photocatalyst filter layer are configured to be formed through a filter cartridge, so that there is an advantage that rapid maintenance including assembly and disassembly of the plasma filter layer and the photocatalyst filter layer is possible.

In addition, since residual ozone is removed by the adsorption catalyst filter layer added in the enclosure, as a result, gas having an ozone concentration lower than the allowable reference value is released into the atmosphere.

In particular, the arc reaction unit proposed in the present invention is odorous substances contained in the gas through the gliding arc, since the gas is oxidized / decomposed while the gas stays and circulates due to the improved gas induction structure through the induction member. Because of the stable removal of the plasma odor reduction device for sewage treatment plants according to the present invention having them has an improved efficiency.

Figure 1 shows the overall configuration of the plasma odor reduction device for sewage treatment plants proposed as a preferred embodiment in the present invention,
Figure 2 shows the overall configuration of the main treatment module in the plasma odor reduction device for sewage treatment plants proposed as a preferred embodiment in the present invention,
Figure 3 shows the overall configuration of the arc reaction unit in the plasma odor reduction device for sewage treatment plants proposed in the preferred embodiment of the present invention,
Figure 4 shows the operating state of the arc reaction unit shown in FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail the plasma odor reduction device for sewage treatment plants proposed in the preferred embodiment of the present invention.

Figure 1 shows the overall configuration of the plasma odor reduction device for sewage treatment plants proposed as a preferred embodiment in the present invention.

Plasma odor reduction device 1 for a sewage treatment plant proposed as a preferred embodiment of the present invention is to quickly remove and discharge odorous substances such as inorganic compounds and volatile organic compounds in gaseous state contained in the gas discharged from the sewage treatment plant. will be.

The plasma odor reduction apparatus 1 for sewage treatment plant includes an enclosure 110 having an intake passage 111 and an exhaust passage 112 as shown in FIG. 1; It includes a main processing module 100 including a blower 120 for introducing a gas into the enclosure 110 through the suction passage 111 to force the discharge through the exhaust passage 112.

Referring to the drawing, the pretreatment module 200 having the metal filter for oil / moisture removal and the demister filter for dust filtration included in the gas is introduced into the intake passage 111 of the main treatment module 100, and ozone is introduced into the gas. The ozone generating module 400 is installed, respectively, and the exhaust path 112 of the main processing module 100 to remove the fine dust contained in the gas through the water treatment to spray the fine particles in the post-processing module 300 This is installed.

Accordingly, the intake passage 111 of the main processing module 100 removes dust having a large amount of oil / moisture and particles while passing through the pretreatment module 200, and mixes ozone generated in the ozone generating module 400. Is introduced.

At this time, some of the ozone introduced from the ozone generating module 400 is directly oxidized and reacted with some of the odorous substances contained in the gas during the filtration process through the pretreatment module 200, the rest is mixed in the gas main treatment module While passing through the plasma filter layer 130 and the photocatalyst filter layer 140, which are described later, the plasma reaction particles (oxygen atom, OH radicals), reacting instantaneously with malodorous substances entrained in the gas and into harmless or odorless substances.

In addition, the short-lived plasma reactive oxygen particles which are not used to directly remove odorous substances collide with the surrounding oxygen and nitrogen molecules to be converted into long-lived ozone, hydrogen oxide, and nitrogen oxide and pass through the adsorption catalyst filter layer 150. The malodorous substance adsorbed on the adsorption catalyst filter surface layer is further oxidatively decomposed by these ozone, hydrogen oxide and nitrogen oxide.

In addition, the gas discharged through the exhaust passage 112 of the main processing module 100 is discharged in a state in which fine dust is removed through a water treatment process of the aftertreatment module 300, and after the pretreatment module 200. The processing module 300 and the ozone generating module 400 are well known, and those skilled in the art can appropriately select whether or not to adopt them according to working conditions or working environments.

On the other hand, Figure 2 shows the overall configuration of the main treatment module in the plasma odor reduction device for sewage treatment plants proposed as a preferred embodiment in the present invention, the housing 110 of the main treatment module 100 is shown in FIG. 1 and 2, high-energy electrons (1-5 eV, 1 eV = electron temperature 11,500 degrees K) through gliding arc discharge, a plasma filter layer 130 for generating ultraviolet light, and the plasma filter layer 130 Photocatalyst filter layers 140 for generating OH radicals and plasma active reaction particles are respectively disposed by the ultraviolet rays generated from the.

Here, the high-energy electrons generated by the plasma filter layer 130 collide with the water and air contained in the gas and plasma active particles such as active hydrocarbons, active oxygen, active hydrogen, active nitrogen, ozone, OH radicals, hydrogen peroxide and NOx. And the photocatalytic filter layer 140 generates a large amount of active oxygen atoms that decompose malodorous substances by heat of 600-900 ° C. and a large amount of ultraviolet light emitted from the gliding arc discharge. Oxidation / reduction reactions decompose odorous substances in the gas.

In the present exemplary embodiment, the plurality of plasma filter layers 130 and the plurality of photocatalyst filter layers 140 are stacked in alternating layers in the housing 110 of the main processing module 100 in an alternating manner, and are enclosed through the intake air 111. The gas introduced into the 110 alternately passes through the plasma filter layer 130 and the photocatalyst filter layer 140 which are alternately stacked, thereby repeatedly removing the malodorous substance, thereby improving efficiency due to the removal of the malodorous substance.

The photocatalyst filter layer 140 includes a photocatalyst filter 142 coated with TiO ₂ on a carrier on which the filtration holes 142a are formed, and the plasma filter layer 130 is formed with an inlet 132a at the rear and the front thereof. In the hollow of the discharge tube 132 in which the exhaust port 132b is formed, the arc generating unit 133 having the form in which two or more discharge electrodes 134a are spaced apart is accommodated, and the plasma is discharged through the arc discharge between these discharge electrodes 134a. The active reaction particles and the plurality of arc reaction units 132 for generating ultraviolet rays are arranged in a form.

In the present embodiment, the plasma filter layer 130 having a total of 100 arc reaction units 132 arranged in 10 rows and 10 rows and the photocatalyst filter layer 140 including the photocatalyst filter 141 are alternately arranged up and down in the housing 110. It is laminated in multiple stages.

As such, when the plurality of plasma filter layers 130 and the photocatalyst filter layers 140 are alternately stacked in the housing 110, the odorous substances included in the gas are repeatedly filtered while passing through the respective filter layers 130 and 140. Since the odorous substances contained in the gas can be more stably removed, the plurality of main treatment modules can be provided to prevent the bulkiness of the device.

In this embodiment, the arc reaction units 132 are directly fixed in the enclosure 100 so that the plasma filter layer is not integrally formed in the enclosure, but the plurality of arc reaction units 132 and the discharge electrodes of the arc reaction units 132 are provided. Each of the current supply units 135 for supplying a high voltage current to the 134a is fixed to the cartridge body 131 to form a plasma filter cartridge 130 ', and the plasma filter cartridge 130' is placed in the housing 110. A plasma filter layer 130 having a plurality of arc reaction units 132 is formed in the enclosure 100 by entering the formed cartridge charging portion 113.

In addition, the photocatalyst filter layer 140 may also have a photocatalyst filter cartridge 140 ′ by arranging one or more photocatalyst filters 142 having a plurality of filter holes 142a formed in the cartridge body 141, similarly to the plasma filter layer 130. And the photocatalyst filter cartridge 140 'enters the cartridge charging portion 113 formed in the housing 110 to form the photocatalyst filter layer 140, respectively.

As such, when the plasma filter layer 130 and the photocatalyst filter layer 140 are formed in the housing 110 through the filter cartridges 130 'and 140', the discharge electrode 134a of the arc reaction unit 132 is replaced later, or the photocatalyst is formed. The plasma filter layer 130 including the cleaning of the filter 142 and the photocatalyst filter layer 140 may be quickly and easily maintained.

Figure 3 shows the overall configuration of the arc reaction unit in the plasma odor reduction device for sewage treatment plants proposed as a preferred embodiment in the present invention, Figure 4 shows the operating state of the arc reaction unit shown in FIG. will be.

And, in the present embodiment by arranging the improved arc reaction unit 132 in the plasma filter layer 130, by the arc reaction unit 132 a large amount of gas mixed while staying and circulating in the arc generating unit 134 Odor substances are oxidized / decomposed.

The arc reaction unit 132, as shown in Figures 3 and 4, the discharge inlet 133a is formed in the front and the exhaust pipe 133 is formed with an exhaust port 133b in the rear; And an arc generator 134 in which two or more discharge electrodes 134a having an inclined surface are spaced apart in the hollow of the discharge tube 133.

As shown in the drawing, the discharge electrode 134a fixes the terminal portion in an insulating structure to the perforations formed in the discharge tube 133 through the insulator 134c, and receives a high voltage current through the terminal portion exposed to the outside of the discharge tube to prevent the gliding arc. Create

In addition, a gas guide piece 134b is disposed at the rear of the discharge electrode 134a to guide and transport the gas to be transferred to the outside of the arc generator 134 to be guided into the arc generator 134 where the gliding arc is generated. do.

Therefore, the gas transported to the outside of the arc generating unit 134 is guided into the arc generating unit 134 by the guide piece 134b, so that the stable removal of odorous substances is allowed through the arc generating unit 134. Is achieved.

Then, the interval between the discharge electrodes 134a is configured to gradually widen from the rear to the front, so that when the high-voltage current is discharged between the discharge electrodes 134a to generate an arc, the arc is an inlet ( It is glided repeatedly from the rear to the front by the gas forcibly transported from the rear to the front through 133a to form a gliding arc area of a large area.

At this time, the shortest gap distance between the discharge electrodes 134a is 0.2 mm or more and the longest gap distance is set in the range of 0.5 to 2.0 mm, and the thickness of the discharge electrodes 134a is set in the range of 0.5 to 4.0 mm. The gap distance and thickness between them are changed according to high voltage conditions such as applied voltage, current and frequency, ceramics for suppressing arc generation, and insulated connection fittings made of high temperature polymer composite.

On the other hand, in the present embodiment to implement such an arc reaction unit 132, it is installed to be accommodated in the hollow of the discharge tube 133, by adding an induction member 136 surrounding the outside of the arc generating unit 134, this The odor substance is stably removed while the gas is retained and circulated in the arc generator 134 by the induction member 136.

Here, the induction member 136 is composed of a reticulated body formed with a plurality of main exhaust holes (136a) on the side wall, the inlet 136b communicating with the inlet 133a of the discharge tube 133 is formed in the rear and the inlet at the front Partially discharged the gas introduced through 136b, the induction exhaust hole 136c for gliding the arc generated between the discharge electrode (134a) is formed.

In addition, when the main exhaust hole 136a of the induction member 136 is configured in a spiral shape, the gas discharged through the main exhaust hole 136a is quickly discharged while forming a vortex, so that the odorous substance is decomposed through the arc generating unit. The rapid release of can be achieved.

Accordingly, some of the gas introduced into the arc generating unit 134 through the inlet 136b of the induction member 136 is discharged to the induction exhaust hole 135c formed in the front, and the arc generated between the discharge electrodes 134a. Gliding forward to generate a gliding arc, and the rest is circulated through the arc generating unit 134 is discharged to the side through the main exhaust hole (136a) formed in the side wall.

Thus, in the arc reaction unit 132 according to the present embodiment, all the gas introduced from the rear through the inlet 136b by the induction member 136 is not discharged forward, and the gas remains in the arc generating unit 134. And stinks are stably removed while circulating, and then discharged through the main exhaust hole 136a formed in the side wall.

Meanwhile, fine dust, water-soluble intermediate oxidation by-products, and untreated odorous substances may remain in the gas discharged while sequentially passing through the plasma filter layers 130 and the photocatalyst filter layers 140 alternately stacked. have.

In consideration of this, in the present embodiment, the gas passing through the plurality of plasma filter layers 130 and the photocatalyst filter layer 140 in sequence is re-filtered in the enclosure 110, so that the fine dust remaining in the gas and the water-soluble intermediate oxidation by-product And an adsorption catalyst filter layer 150 for decomposing untreated malodorous gas and the like.

Here, the adsorption catalyst filter layer 150 includes an ozone decomposition catalyst filter 152 and a residual pollutant gas decomposition catalyst filter 153 which are formed separately, and serve as a carrier of each of the catalyst filters 152 and 153. Cordierite ceramics, porous fibers, and metals are used.

In this embodiment, the adsorption catalyst filter layer 150 is not integrally formed in the housing 110, and similarly to the above-described plasma filter layer 130 and the photocatalyst filter layer 140, the cartridge body 151 has an ozone decomposition catalyst filter ( 152 and the residual contaminated gas decomposition catalyst filter 153 are fixed to form an adsorption catalyst filter cartridge 150 ', and the adsorption catalyst filter cartridge 150' is formed in the cartridge charging portion 113 formed in the housing 110. It is configured to install, so as to have convenience in future maintenance.

As the catalyst of the ozone decomposition catalyst filter 152, a metal oxide mainly containing 5 to 50% of manganese dioxide, copper, cobalt oxide, or manganese dioxide / copper oxide may be adopted, and a residual pollutant gas decomposition catalyst filter. As the catalyst of 153, oxide catalysts containing Graphite, Zeolite or silica-alumina catalysts, high metals (Pt, Au, Ag) and low metals (Ti, Sn, W) may be adopted.

Accordingly, in the main treatment module 100 of the plasma malodor reduction device 1 for the sewage treatment plant according to the present embodiment, the gas pretreated in the pretreatment module 200 through the blowing operation of the blower 120 includes the housing 110. When introduced into the gas, the gas passes through the arc reaction unit 132 of the plasma filter layer 130 and the filter holes 142a of the photocatalyst filter layer 140 which are alternately stacked in multiple stages, and the active particles generated therefrom. Various odorous substances are oxidized / decomposed by (bond ions such as O, N, C, H), OH, HO _{2 and} NO ₂ radicals.

The residual ozone, NOx and malodorous substances contained in the gas are ozone decomposed at 50 to 150 ° C., and then flow into the adsorption catalyst filter layer 150 which increases the contact time of the active oxygen with the malodorous gas.

At this time, the residual ozone mixed in the gas is removed by the ozone decomposition catalyst filter 152 of the adsorption catalyst filter layer 150, and the fine dust remaining while passing through the residual pollutant gas decomposition catalyst filter 153 and the water-soluble intermediate oxidation by-product. The product, the untreated malodorous gas, etc. are removed and finally flowed into the aftertreatment module 300 through the exhaust passage 112, and the fine dust through the water treatment is filtered and then discharged into the atmosphere.

1. Plasma odor reduction device for sewage treatment plant
100. Main filter module 110. Enclosure
111. With intake 112. With exhaust
113. Cartridge insert 120. Blower
130. Plasma filter layer 130 '. Plasma Filter Cartridge
131. Cartridge body 132. Arc reaction unit
133. Discharge tube 133a. Inlet
133b. Exhaust port 134. Arc generator
134a. Discharge electrode 134b. Judo
134c. Insulator
135. Current supply unit
136. Guide member 136a. Main exhaust hole
136b. Inlet 136c. Induction vent
140. Photocatalyst filter layer 141. Cartridge body
142. Photocatalyst Filter 142a. Filter
150. Adsorption catalyst filter bed 150 '. Adsorption Catalytic Filter Cartridge
151. Cartridge body 152. Ozone decomposition catalyst filter
153. Residual pollutant gas decomposition catalyst filter
200. Pretreatment Module 300. Posttreatment Module
400. Ozone Generating Module

Claims (6)

An enclosure having an intake passage and an exhaust passage; Comprising the main processing module including a blower forcibly introducing the gas introduced into the enclosure through the intake, and then forcibly discharged through the discharge path,
In the enclosure, a plasma in which a plurality of arc reaction units are arranged in a hollow of a discharge tube having an inlet formed at a rear thereof and an exhaust hole formed at a front thereof is spaced apart from each other to generate a gliding arc through discharge between the discharge electrodes. Filter layers and a plurality of photocatalyst filter layers on which one or more photocatalyst filters are disposed are alternately stacked in multiple stages,
The gas introduced into the enclosure through the intake passage and discharged through the exhaust passage is configured to remove odorous substances contained in the gas while sequentially passing through the plasma filter layer and the photocatalyst filter layer alternately stacked in multiple stages. Plasma odor reduction device. The apparatus of claim 1, wherein the arc reaction units are disposed in the cartridge body to form a plasma filter cartridge, and each enters a cartridge charging unit formed in the enclosure to form a plasma filter layer. The apparatus of claim 1, wherein the photocatalyst filter is fixed to the cartridge body to form a photocatalyst filter cartridge, and enters a slot formed in the enclosure to form a photocatalyst filter layer. The apparatus of claim 1, wherein an adsorption catalyst filter layer for re-filtering the gas that has passed sequentially through the plurality of plasma filter layers and the photocatalyst filter layer is added to the enclosure. 5. The plasma odor reduction for sewage treatment plants according to claim 4, wherein the adsorption catalyst filter is fixed to the cartridge body to form an adsorption catalyst filter cartridge, and enters the cartridge charging unit formed in the enclosure to form the adsorption catalyst filter layer. Device. According to claim 1, wherein the arc reaction unit, the discharge pipe is formed in the inlet port in the front and the exhaust port in the rear; An arc generating unit in which at least two discharge electrodes having an inclined surface are disposed in the hollow of the discharge tube and spaced apart from each other; It is installed to be accommodated in the hollow of the discharge tube is configured to include an induction member surrounding the outside of the arc generating unit,
The induction member is a reticulated pipe body having a plurality of main exhaust holes formed on a side wall, an inlet communicating with an inlet of a discharge tube is formed at a rear side, and an induction exhaust hole for discharging a part of the gas introduced through the inlet at the front is formed. Of the gas flowing into the arc generating unit through, some of the gas is moved straight forward and discharged to the induction exhaust hole formed in the front while gliding the arc generated between the discharge electrode to generate a gliding arc, the remaining gas circulates the arc generating unit Then, the odor reduction device for sewage treatment plant, characterized in that configured to be discharged to the main exhaust hole by changing the direction of travel to the side.

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