KR920002810B1 - Waste water treating method and apparatus by ozone - Google Patents

Abstract

The apparatus includes an air compressor (1), an accommodating tank (2), a post-cooler (3), a main filter (4), an air drier (5), a suction type air drier (6), a line filter (7), and an adjustor (8). The air compressor (1) supplies a pure dry air, and an improved ozone generator (9) produces ozone by utilizing a clean air. A pyrex tube includes a second tube for passing the air, and surrounds a first tube, being made of glass. The ozone which is produced in this way passes through an ozone eductor (12) to enter into a reactor (13) in which the ozone and a waste water are mixed together. The waste materials are decomposed through oxidation, and then, the waste water is transferred to a reacting tank (13') where the waste water is further purified at the presence of some chemicals.

Description

Wastewater Treatment System by Ozone

1 is a schematic diagram of a wastewater treatment process utilizing ozone produced from an ozone generator in accordance with the present invention.

2 shows an ozone generator 9 newly designed as a unit of a wastewater treatment apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

1: air compressor (blower) 2: receiving tank

3: after cooler 4: main filter

5: air dryer 6: adsorption type air dryer

7: line filter 8: regulator

9: ozone generator 10: throttle

11: distributor 12: eductor

13 reactor 13 'reactor

14 cooling tower 15 wastewater storage tank

16 flow meter 17 measuring pump

18: heat exchanger 19: sand filter

The present invention relates to a method for treating wastewater by ozone and an apparatus used therein. More particularly, the present invention provides a method for treating wastewater of certain harmful substances (plating wastewater), COD and BOD treatment, treatment of organic and inorganic synthetic wastewater (especially released by pharmaceutical companies) using ozone generated in an ozone generator, Water sterilization and methods for sterilizing and preventing odors and pathogens from livestock, such as barns, cages and pigs.

The present invention also relates to a wastewater treatment apparatus in the form of a package organically combining a series of devices including an ozone generator for generating ozone from pure air in order to carry out the treatment method described above.

Conventional treatment methods include alkali chlorine injection method, reduction precipitation method, ion exchange method, and electrolytic oxidation method, which are summarized as follows.

A. Alkaline Chlorine Injection

CNO^-+2Cl^-+H₂OCN ^- + 2OH ^- + Cl ₂

_{^{CNO - + 2Cl - + H 2}} O

2CO₂+N₂+6Cl^-+2H₂O2CNO ^- + 4OH ^- + 3Cl ₂

^{_{2CO 2 + N 2 + 6Cl -}} + 2H 2 O

A. Problems When Adopting This Method

The effects of effluent from residual chlorine should be considered.

B. It slows down the destruction of CN ^- ions and takes 30-60 minutes. Insoluble heavy metals contain the inhibitors of Cl ions, which form complex ions, which make it difficult to treat heavy metals below the standard. .

N. Reduction Precipitation

Cr⁺³으로의 불용성 처리방법에 한한다.Cr ^{+ 6} is reduced to Cr ⁺ 3 at pH ³ and neutralized with NaOH to treat Cr (OH) ₃ (Ksp = 1 x 10 ^-30 ). This way just Cr

^Limited to insoluble treatment with Cr ⁺³ .

C. Ion exchange method

In general, factory wastewater contains heavy metals of various types and forms, so that the pretreatment is complicated to remove them, and it is not desirable to apply them on site.

D. Electrolytic oxidation

This method is designed for the purpose of recovering and reusing metal ions in waste water, and cyanide is not completely oxidized. In this method, the metal cyanide cannot be used in high concentration wastewater such as containing 50,000 ppm of cyanide or treated below the standard value by the environmental preservation method.

These conventional methods are more difficult in the treatment of the plating shop and the specific hazardous matter discharge shop because the state of containing the specific hazardous materials is almost mixed.

Moreover, while the drain water of heavy metals ^{Cd +2, Pb +2, Hg +2} , Cu +2, Cr +6 , etc. other than CN ^-, such as tartrate, citrate, chloride, hydroxide _{^{-, NH 4 +, F -}} , NO 3 It is contained in a complex. _{^{CN -, Cl -, NH 4}} +, F -, NO 3 - tartrate, citrate, chloride, hydroxide, etc. The presence of metal hameuroseo adult ^{Cd +2, Pb +2, Hg +2} , Cu +2 ... Since the heavy metal is changed to re-solubility by changing to a complex compound or a chelating compound, the conventional treatment method cannot be developed under such a technology and it is impossible to treat it below the standard value by the environmental preservation method.

The object of the present invention is to make the redissolved, i.e., change into a complex compound or chelate, to make the heavy metals below the standard value by the resoluble environmental preservation method by performing physicochemical treatment using ozone gas.

That is, the present invention is ozone (O ₃₎ of first elements in order to inhibit the removal of heavy metals as physical and chemical processing method using a gas CN ^-, NH ₄ ^+, Cl, F ^-, NO ₃ ^-, tartrate, citrate ... Chelating compounds such as chelating compounds and ionic materials forming complex compounds, and then heavy metals such as Cu ⁺² , Cd ⁺² , Pb ⁺² , Hg ⁺² . Etc. are made into poorly soluble and insoluble materials of the emulsion as indicated by Ksp (soluble solubility), and excess Na ₂ S and the like are treated with FeSO ₄ to be insoluble in FeS to prevent formation of complex ions by excess Na ₂ S Therefore, the discharged water as well as the sludge are insoluble under the environmental protection standard. OREC company's data were taken into account in the United States to adapt the ozone generator that generates ozone in the field.

This treatment method is a device that removes the elements that impede the heavy metal insolubility by additionally installing in the first step in the existing facilities in the wastewater treatment plant. Sludge amount is reduced to about 1/10.

The principle and process of treating wastewater with ozone generated by the ozone generator of the present invention will be described in detail as follows.

1. Inhibitors when removing heavy metals

Heavy metals ^{(Cu +2, Cd +2, Pb} +2, Cr +6, As +3 ... , etc.) insoluble in order to screen the processing CN inhibitory factor contained in the wastewater _{^{-, NH 4 +, F -}} , Cl - , NO ₃ ^- ... Back should be removed. When this inhibitor is contained, the heavy metal substance becomes a chelate or complex ion and is detected in a dissolved state.

2. Comparison of Ksp (Solubility)

As shown in the table, emulsions are precipitated as very poorly soluble compounds and are not eluted compared to hydroxides. However, no matter how insolubilized, if it contains inhibitors, it is likely to be re-dissolved and eluted.

1) CuS

end. Sodium hydroxide, dilute hydrochloric acid, dilute sulfuric acid

I. CuS + 2KCN ―――――― Cu (CN) ₂ + K ₂ S

2Cu (CN) ₂ ―――――― 2CuCN + (CN) ₂

2CuCN + 6KCN ----------- 2K ₃ Cu (CN) ₄ (complex)

^{* Pb +2 + 2OH - ------ Pb} (OH) insoluble or for the _second case, however, the lead ions is not to grant the availability condition. The condition is slightly different in two cases:

(1) When lead ions exist alone

Since lead hydroxide is a positive compound, it binds with excess hydroxyl ions to become zinc acid ions and dissolve again.

^{_{Pb (OH) 2 + OH -}} ------ HPbO 2 - + H 2 O

(2) When lead ions coexist with other ions

When the metal ions of silver, copper, and zinc coexist, coprecipitation occurs and the treatment is easier than in the case of (1). PH: 7.0-9.5

Opinion: compare Ksp

Since hydroxides are amphoteric compounds as described above, complex ions are generated, which makes it difficult to prevent them.

When emulsion is precipitated as Na ₂ S, and a water-insoluble material, such as shown in the Ksp complex ion with a risk of developing when the S ^-2 excess was added FeSO ₄ because remove excess S ^-2 it can be a stable process.

All. Nitrate: Easily soluble

_{^{3CuS + 2NO 3 - + 8H +}} ------ 3Cu +2, 2NO + 4H 2 O + 3S

la. Ammonia in the wastewater: If CN ⁻ is present, a complex ion of Cu (NH ₃ ) ₄ ⁺² or (Cu (CN)) ^-3 is produced and redissolved.

CdS

It is possible to completely insolubilize the free cadmium ion dissolved in the drainage simply by raising the pH of the solution, but if halogen ions, cyan ions or ammonia ions are present in the waste water,

Chloro complex salt (CdCl) ^-2

Cyanide complex salt (Cd (CN ₄ ) ^-2

Rock salt complexes Cd (NH ₃ ) ^-2 and the like are readily dissolved.

3) Oxidation Power by Metal Sulfide (S ^-2 )

Mercury> Copper> Cadmium> Antimon> Tin> Lead> Zinc> Nickel> Iron> Arsenic> Mn

4) HgS

In the presence of excess sodium sulfide, mercury sulphide dissolves to form io complex ions (HgS ^-2 ).

Prevention method: Ferrous sulfate is added to form iron sulfide to coprecipitate.

5) Cr (OH) ₃

end. Does not react with emulsions.

I. After sufficiently adjusting the acidity (pH 2-3), neutralization precipitation to alkaline becomes insoluble Cr (OH) ₃ .

6) Pb (OH) ₂ and PbS

Comparing Ksp, it is easily insoluble when only the inhibitor is removed (see the description of the positive chlorine for Pb (OH) ₂ ).

1. Removal of inhibitors

_{^{1) CN - + O 3 -----}} N 2 + CO 2 ----- (CN - O to the concentration of _3: 2.58 times (weight ratio))

2) 2NH ₄ ⁺ + O ₃ ―――― N ₂ + H ₂ O ――――― (O ₃ : 1 (molecular ratio) with respect to NH ₄ ⁺ concentration)

3) Cl ^- + O ₃ ----- ----- Cl ₂ (Cl ^- O ₃ for the level 1 (min ratio)

4) F ^- + O ₃ ----- ----- F ₂ (F ^- O ₃ for the level 1 (min ratio)

As described above, if the inhibitory factor is removed by ozone, the heavy metal wastewater can be completely treated as the heavy metal becomes easily insoluble. In other words, ozone generator is a method that decomposes or oxidizes elements that inhibit heavy metal insolubilization by O ₃ (ozone), and applies current treatment method with Na ₂ S and neutralization reaction to existing treatment facilities.

[Treatment using ozone]

Recently, the treatment method of cyanide by ozone has been studied and it has been successfully commercialized due to mechanical development. Although it was explained in the previous chapter, it is considered that the heavy metal wastewater in Korea is not separated but is a mixed form, and there is no way to solve it by staged treatment.

Treatment with ozone is somewhat burdensome, but the situation is not considered burdensome compared to the electricity costs for biological treatment used for general wastewater treatment.

Ozone is generated by ozone generator to oxidatively decompose cyanide in water.

2KCN + O ₃ ―――――― 2KCNO + O ₂ ‥‥‥‥‥‥‥‥‥‥‥‥‥ (1-1)

2KCN + 5O ₃ ―――――― 2KHCO ₃ + N ₂ + 5O ₂ ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ (1-2)

The reaction of Formula (1-1) is progressing rapidly, but the reaction of Formula (1-2) is slow. Therefore, at this time, a method of promoting the reaction by adding a catalyst (CATALYST) is adopted.

1. Alkaline

Wastewater may be alkaline for the purpose of promoting the reaction for recovery, removal of useful materials and flocculation precipitation.

1) The same method as oxidative decomposition and removal of cyan in waste water by chlorine in alkaline reaction is applied.

The pH range is about 8 to 10.

2) In order to completely oxidize cyanide, raise the pH of the wastewater with caustic soda to about 11 and then contact O ₃ gas. At this time, the wastewater must be vigorously stirred to prevent precipitation with sodium or calcium salt before cyanide is oxidized. . Other metals are present in the plating wastewater, forming complexes in the cyan, which prevents cyanide from oxidative decomposition. Therefore, O ₃ gas must be injected above the calculated value. The following equation holds.

[Scheme]

Seven molecules of O ₃ are consumed to decompose two molecules of KCN.

KCN: O ₃ = 1: 3.5 (molecular ratio)

KCN: O ₃ = 1: 2.58 (weight ratio)

3) Determining O ₃ Usage

In other words, when the cyanide content is 150mg / l in the wastewater, it is reasonable to base the total concentration on 250mg / l because the wastewater contains other oxidizing substances.

O ₃ total consumption

(A) Other inhibitors besides CN ^- have an O ₃ reaction molecular ratio of 1: 1 but KCN: O ₃ = 1: 3.5 (molecular ratio) and KCN: O ₃ = 1: 2.58 (weight ratio).

B) In addition, since other metals are contained, the total required value of O ₃ is 2.58 times.

을 처리할 때Wastewater 100

When processing

CN ^- Assumption 150ppm

100 ppm inhibitory assumption

250 ppm total

중 CN^-함량 25kg/100As in the example above (Example 1), the total CN ^- concentration shows a wastewater of 100

CN ^- Content 25kg / 100

처리시 O₃의 소비량)250kg × 2.58 times = 64.5kg (250ppm 100

Consumption of O ₃ during processing)

4) Determination of ozone generator capacity

중에 64.5kg의 CN^-을 산화 분해할 때 처리시간을 6시간 기준하면 오존발생기에서 발생하는 O₃의 양은 다음과 같다.Wastewater 100

When oxidative decomposition of 64.5 kg of CN ^- is carried out for 6 hours, the amount of O ₃ generated in the ozone generator is as follows.

end. 64.5kg ÷ 6hrs = 10.75kg / hr (O ₃ generation)

I. 10.75 ÷ 60Min = 0.179kg / MIN

All. 0.179kg ÷ 60sec = 3g / sec

2. Theory of Complexes

Cu(CN)₂+K₂SCus + 2KCN

Cu (CN) ₂ + K ₂ S

2CuCN+(CN)₂ 2Cu (CN) ₂

2CuCN + (CN) ₂

2K₃Cu(CN)₄(착이온)2CuCN + 6KCN

2K ₃ Cu (CN) ₄ (Solid ion)

That is, Cu (CN) ^-3 complex ion forms and dissolves.

In other words

Cu(OH)₂존재CuSO ₄ solution

Cu (OH) ₂ present

Cu(CN)₂+2KCNCu (OH) ₂ + 2KCN

Cu (CN) ₂ + 2KCN

2CuCN+(CN)₂ 2Cu (CN) ₂

2CuCN + (CN) ₂

2K₃Cu(CN)₄(착화합물)2CuCN + 6KCN

2K ₃ Cu (CN) ₄ (complex)

Cyanide solutions are used for electroplating gold, silver, zinc, cadmium and other metals. In the cyanide solution, the concentration of metal ions which are not complex ions is very small and is used to coat fine particles uniformly. Anions (tintarate, citrate, chloride, hydroxide) that form other complex ions are also used as electroplating solutions.

5) Another embodiment of the present invention

(1) When treating general wastewater (other than specific wastewater), apply CO2 and BOD by oxidative decomposition using ozone generator in a place where it is difficult to treat below the standard with COD and BOD according to the Environmental Protection Act. Wastewater with high treated COD and BOD is installed at the rear end and reacted when discharged.

(2) Pharmaceutical company discharge

Pharmaceutical company effluents are also wastewater, mainly composed of organic and inorganic compounds. In particular, π bonds (pi bonds) in chemical bonds have been investigated in the method of destroying at room temperature except ozone.

(3) Water treatment sterilization

In general, the chlorine method is used, but the ozone method has excellent sterilizing power and there is no problem with residual chlorine.

(4) Prevention of odors and pathogens in pens, houses and pig farms (with usage instructions)

The wastewater treatment method of the present invention will be described in detail with reference to FIG.

The wastewater treatment method of the present invention will be described in detail with reference to FIG. The ozone generator varies according to the waste water capacity as shown in the capacity table (Table 1) (based on 300 ppm of inhibitors), and the air compressed from the air compressor (or blower 1) is 2kg / ㎠-7kg / ㎠ pressure and air temperature After the aftercooler (2) at + (70 ℃ -100 ℃), the inlet temperature is room temperature + (70 ℃ -100 ℃), and the outlet temperature is cooled to 22 ℃ -43 ℃ to control the main filter (40㎛). ), Most of the dust is removed, and air is injected into the air dryer (4) at an inlet temperature of 22 ° C.-43 ° C. and an injection pressure of 2 kg / cm 2 -7 kg / cm 2, and the amount of saturated steam that can be compressed air can contain. Moisture is removed to 0.7g-0.91g per unit M ³ and the oil and particles are separated from the composite filter 5 again through the 3㎛ filter built in the air dryer. After making pure dry air, it enters the ozone generator (8), and the inlet temperature is 30-35 ℃ and the gas Season 7 yideok the inlet pressure thereby flows adjusted to 10PISG-30PISG. Ozone O ₃ (ozone) generated by the generator (8) via a chekkeu valves 10 to prevent back flow through the GAS flow meter 19 at the emitter Flows into (15).

Contact with O ₃ (ozone) gas in eductor (15) with water pressure lkg / cm2-3kg / cm2 with metering pump (12) by adjusting the refrigerant to Cu ⁺² compound and oH: 9-10 in wastewater storage tank (11) When the flow rate is the ratio of the amount of O ₃ (ozone) GAS to the inhibitory element concentration (ppm) of the wastewater storage tank (11), the flow rate in the ratio of 1: (3-4) and the flow rate in the metering pump (12) The flowmeter 13 is adjusted again and flows into the eductor 15 through the check valve for preventing backflow.

Eductor 15 has been described above, the amount of the ratio of O ₃ (ozone) which can oxidize the decomposition insoluble inhibiting element concentration (ppm) and O ₃ (ozone) in the waste water is from 1: (3-4) (weight ratio Through the eductor (15) that can be mixed well in contact with the) the principle of the eductor acts as the aspirator principle.

Wastewater mixed with O ₃ (ozone) is continuously oxidatively decomposed in the reactor 16 so that the residence time in the reactor 16 is 20 to 40 minutes and then transferred to the reactor 18.

The waste water in the reaction tank 18 is a CN insoluble inhibitory factor in the heavy metal insolubilization _{^{-, Cl -, NH 4 +}} , F -, NO 3 -, tartrate, citrate ... And the like, since Cr ⁺⁶ , Cu ⁺² , Cd ⁺² , Hg ⁺² , Pb ⁺² . Etc., so to remove the first Cr ⁺⁶ when it is contained pH: adjusted to 2-3 after Na ₂ S was added and the appropriate amount pH by the addition of NaOH: after adjusted to 9-10 FeSO in order to remove excess Na ₂ S _{4 If} appropriate amount is added and pH is adjusted to 8-9, and sedimentation is separated, the supernatant is treated with specific harmful substances below the environmental protection law and sludge is also below the waste management law.

In addition, the pipe size of the entire system is determined by the capacity selection of the air compressor (or blower) 1, the compressor 20 is to prevent congestion in the waste water storage tank 11 reactor 16 and the reaction tank 18. Aeration container acts to inject air. All the necessary automatic control is done on the control panel.

In addition to the above process description, the number 6 of Table 1 is selected for the motor horsepower and the ozone generation amount of the compressor, and will be described in detail as follows.

TABLE 1

The amount of air generated when the motor horsepower of the air compressor (or blower) 1 is set to 35HP is 139CFM, and in the case of the generated air compressor, the cooler is attached to itself and the discharge air temperature is 40-50 ° C. To cool at 22-43 ° C (according to air compressor manufacturer's specifications).

If the blower is selected (according to the manufacturer's specifications), since the discharge air temperature is room temperature + (70-100 ° C), the aftercooler 2 is cooled to 22-43 ° C. The main filter (3) and the air dryer (4) and the combined filter select and use the specifications corresponding to the air volume of the air compressor (blower) of 139CFM, which is also in accordance with the manufacturer's specifications, and the OZONE generator (8) uses the GAS regulator (7 ) Ozone generator that generates more than OZONE, 2,835GR / HR by inflow at a constant pressure of 10PSI is produced by itself.

Accurate and constant amount of wastewater storage tank 11 to metering pump 12 sends 4.25 tons per hour to eductor 15 and 20 to 40 minutes of treatment time in reactor 16 results in heavy metal insolubilization. When the inhibitors are oxidatively decomposed and treated by insolubilization, specific harmful substances become insoluble to prevent secondary contamination.

TABLE 2

EXAMPLE

The heavy metal-containing wastewaters of Banwol, Gyeongin, Central and Cheil Plating Associations were ozonated according to the present invention by the following treatment method.

[Treatment method (COD, BOD etc…)]

When COD and BOD are higher than the environmental pollution standard and the chemical treatment is not possible, chemical treatment is used for the first treatment and then stored to adjust the pH to 8-9. The organic and inorganic synthetic wastewater of pharmaceutical companies can be used in the same way as above, and the water and sterilization method can be used in the same way.

See the following DIAGRAM for deodorization and prevention of pathogens in livestock companies such as barns, houses and pigs.

Example 1

Ozone treatment of heavy metal-containing wastewater from Banwol Plating Association

[Way]

1) By mixing the waste water and O ₃ (ozone) by ejection type

2) pH: 9-10 adjustment

3) After adding Cu ⁺² compound as a catalyst, mix well.

4) Oxidatively decompose the inhibitor by adding O ₃ , adjust pH: 2-3, add Na ₂ S, adjust pH: 9-10, add appropriate amount of FeSO ₄ , adjust pH: 8-9 Precipitate and separate supernatant and sludge.

Experiment: Operate a GENERATOR with a volume of O ₃ (ozone) 20GR / HR and pass it through the pipe contact method. The CN ^- concentration content 65ppm the yeoteuna is 250ppm wastewater 240L element that estimates the other impediments total 250ppm in view so 100ppm by oxidization element capable of decomposing O ₃ (ozone) 20GR / HR is in the waste water and for the 6GR / HR One 200L O ₃ contact time 20 minutes, 30 minutes, 50 minutes, each 120 minutes after treatment, after adjusting the pH: 2-3 and then added Na ₂ S and pH: 9-10 after adding FeSO ₄ After that again adjusted to oH: 8-9 to separate the supernatant. However, Gyeongin Plating, Central Plating, and Jeil Plating were tested in the same way.

* Processing time: 3 hours 30 minutes

Example 2

Ozone treatment of heavy metal-containing wastewater of Kyungin Plating Association in the same manner as in Example 1

* Processing time: 3 hours

Example 3

Ozone treatment of heavy metal-containing wastewater of the first plating association in the same manner as in Example 1

Example 4

Ozone treatment of heavy metal-containing wastewater of the first plating association in the same manner as in Example 1

Effect on the present invention

Claims (2)

Air compressor (1), receiving tank (2), aftercooler (3), main filter (4), air dryer (5), adsorptive air dryer (6), line to provide pure dry air There is a filter (7) and a regulator (8), 99.9% moisture removal, 99.999% oil (0.01 ppm weight / weight) removal as air from this, 100% solids of 0.01 μm or more and also dew point -40 It is equipped with an improved ozone generator (9), a unit for generating ozone using clean air at ℃, while inside the ozone generator, there is a primary tube made of SuS 304 stainless steel, through which air enters. The outer diameter is 8.5mm, and the pyrex tube made of heat-resistant glass, through which the air passing through the primary pipe passes again, is surrounded by the primary tube, and the inner diameter of the tube is 10.6mm and the outer diameter is 13mm. Secondary SuS 304 stainless steel to exit the Pyrex tube The structure surrounding the outer periphery of the Pyrex tube is installed, and on the left side thereof, a tubular corona discharge tube is formed to generate a silent arc discharge. ) of the complex salt after the generation elements to herein as after the combined sewage, waste water reactor ^{_{(13) NH 3 +, Cl}} -, CN -, NO 3 -, F -, 20~ for stannate, to oxidative decomposition and the like citrate Remain 40 minutes and transported back to the reaction vessel (13 ') by adding Na ₂ S to Cd ⁺² , Cr _-3 ^-6 , Cu ⁺² , Pb ⁺² , Hg ⁺² , Ni ⁺² , Zn ⁺² It is made of sulfide precipitates, that is, CdS, CuS, PbS, HgS, etc., and is separated and removed. The reaction vessel is cylindrical, and the ratio of the diameter of the cylinder to the height of the cylinder is 1: 3 to 1: 3.5 and the pipe inside the reactor is Ozone fluid poured from the bottom of the reactor 5cm ~ 10cm high Heavy metal waste water treatment apparatus, comprising a step according to the speed to maximize the swirling phenomenon (turbulent flow) maximize the amount of dissolved ozone. The method of claim 1, wherein the air of 2kg / ㎠-7kg / ㎠ pressure and 70 ℃ ~ 100 ℃ temperature from the air compressor (1) through the after-cooler (3) after cooling to 22-43 ℃ temperature 40㎛ After removing dust and dirt in the first place through the main filter (4) and passing it through the air dryer (5), the air with 7kg / cm2 pressure, dew point of 4 ° C, and water to 0.91g / m is again removed. (7) and the regulator (8), which is finally made into a gentle pure dry air having an air pressure of about 10 psig, and when the air is supplied to the ozone generator (9), the air flowing through the primary pipe first to the initial 10 psig pneumatic pressure The flow rate is reduced to 1/35 and passes through the Pyrex tube again and decreases to 1/2 to maintain a gentle and quiet flow rate, which ultimately results in the maximum effect of O ₃ formation in a silent arc discharge. At this time, supply coolant of 20 ℃ to cooling system. By maximizing O ₃ generation rate by preventing heat generated during discharge, the amount of ozone generated by the ozone generator (9) is 2-3% by weight of the inlet air.

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