WO2021035952A1

WO2021035952A1 - Treatment process for papermaking exhaust gases

Info

Publication number: WO2021035952A1
Application number: PCT/CN2019/115821
Authority: WO
Inventors: 占正奉; 陈学萍; 方敏; 王同星; 季卫国
Original assignee: 山鹰国际控股股份公司
Priority date: 2019-08-26
Filing date: 2019-11-05
Publication date: 2021-03-04
Also published as: CN110559827B; CN110559827A

Abstract

A treatment process for papermaking exhaust gases. The equipment used in this process mainly comprises a demister, a UV photolysis generator, an oxidation tower I, an oxidation tower II, an absorption tower, ozone catalytic oxidation reaction tower, an induced draft fan, and a high-altitude emission device connected in sequence by means of an air duct. An ozone generator communicates with the oxidation tower I by means of a pipe. An oxygen source passes through the ozone generator and then enters the oxidation tower I. A hydrogen peroxide storage tank communicates with the oxidation tower II by means of a pipe and a pump A. A caustic soda storage tank communicates with the absorption tower by means of a pipe and a pump B.

Description

Process for treating papermaking waste gas

Technical field

The invention belongs to the field of waste gas treatment, and specifically relates to a papermaking waste gas treatment process.

Background technique

The paper industry is one of the basic industries of the national economy and is closely related to the development of the social economy and people's lives. The rapid development of the paper industry is also accompanied by increased pollution in the paper industry. With the improvement of people's awareness of environmental protection, the treatment of waste gas from papermaking is increasingly being valued by the industry and the public.

Pulp and paper is a chemical production process using plant fibers as raw materials. In order to complete the physical and chemical reactions in the process, water is often used as a carrier or medium in production. Therefore, papermaking is an industry that consumes a lot of water resources. This kind of reaction and fuel combustion process will release a variety of waste gas, such as odorous, volatile organic compounds and carbon dioxide, etc. The waste water of the paper mill is recycled and used, a large amount of organic matter is precipitated and fermented, which causes the waste water to produce odor, and is using plant fiber raw materials. In papermaking, while obtaining paper and cardboard, it also discharges waste water, exhaust gas, waste residue, and waste heat to the environment, causing environmental pollution. Therefore, appropriate environmental management measures and clean technologies should be adopted to make the environmental impact of the pulp and paper industry somewhat Reduce to meet the requirements of sustainable development. The pollutants emitted to the atmosphere by the pulp and paper industry mainly include sulfur compounds, chlorine compounds, nitrogen compounds, inorganic dust, and organic gases. There are two main types of sulfide emissions: one is malodorous gas, such as hydrogen sulfide, methyl sulfide, dimethyl sulfide, and dimethyl disulfide. This type of escape mainly comes from kraft pulping and alkali Recovery process; the other type is sulfur oxide SOx, which mainly comes from the acidic sulfite pulping process, but also from the neutral sulfite process and the bisulfite process to varying degrees.

Existing waste gas treatment technologies include activated carbon adsorption method, low-temperature plasma technology, biological treatment, combustion method, etc. In the actual treatment process, environmental protection companies that use activated carbon adsorption to treat exhaust gas will basically mention that the decontamination efficiency of such equipment reaches 90% or more in the decontamination parameters of their equipment. However, in the actual decontamination application process, the decontamination parameters The pollution efficiency of more than 90% is only a theoretical value. And under different working environments, its decontamination efficiency is far lower than this theoretical value. The main reasons include the interaction between temperature, working environment humidity, water mist, acidity, dust and adsorbed gas. For example, the southern part of my country has high humidity and high temperature throughout the year, and its actual adsorption capacity of activated carbon is less than 50% of the laboratory. Secondly, the actual operation and maintenance costs of using the activated carbon adsorption method to deal with up-to-standard emissions are very high. At the same time, it is difficult to manage natural absorption and desorption, and its applicability is affected by many factors. Environmental protection meets standards. Moreover, the treatment of a large amount of saturated activated carbon is more expensive. This method only adsorbs and transfers pollutants. If there is no strict monitoring and tracking of the saturated activated carbon transfer process, it is very easy to cause secondary pollution.

Domestically produced pollution control equipment that uses low-temperature plasma technology, a large number of low-energy plasma equipment that can be used for exhaust gas treatment can only be used to control oil fume pollution. In the actual process of industrial waste gas treatment, this low-temperature plasma technology equipment has an impact on organic waste gas. Degradation is basically ineffective and will generate pollution by-products. Its degradation efficiency is low. The flammability of exhaust gas makes its safety a concern.

Biological treatment method has poor applicability: it is only suitable for specific pollutants, and biological bacteria are easy to die. When processing soluble substances and easily degradable pollutants, it will be subject to certain restrictions; biological metabolism is easy to block; biological methods are used The specific surface area and porosity of the filler directly affect the biomass of the reactor and the pressure drop of the entire packed bed and whether the packed bed is easy to be blocked; it is difficult to realize automatic control; it is difficult to improve the control ability of various operating parameters, and the maintenance cost is high and difficult. Management and control failure; difficulty in strain cultivation: it is difficult to screen out dominant strains that efficiently degrade various exhaust gases; reaction site constraints: the reaction device covers a large area and the reaction time is long. Therefore, there is no shortage of decorations in the application of biological law.

In addition, for the combustion method, the temperature in the combustion chamber due to the regenerative combustion (RTO) method is generally not lower than 750°C, even as high as 1000°C, so fuel-type nitrogen oxides will be produced. In the catalytic combustion (RCO) process of organic waste gas, since tap water is used as water spray for pretreatment, the chloride ions in the water and the chloride ions contained in the organic matter can easily generate dioxins in the catalytic combustion chamber (200-500 degrees) English. However, there is no high temperature device on the exhaust gas treatment equipment to promote the decomposition of dioxins. Therefore, the dioxins produced during the combustion of the gas will be directly discharged into the atmosphere, causing secondary pollution.

Chinese patent application CN 107051128 A discloses a multi-stage waste gas treatment system, including a gas scrubber, a UV photolysis purifier, a centrifugal fan, and a purification tower. An air inlet is connected to the bottom of one side of the gas scrubber, and the gas scrubber A mist eliminator is installed above the inside of the tank, and the upper end of the purification tower is provided with a discharge port; through gas washing, light deodorization, water and gas separation and purification, relatively pure gas is finally discharged. However, the system contains electric heating pipes and other equipment, which poses safety hazards due to the particularity of the exhaust gas composition.

It can be seen that the exhaust gas treatment technologies in the prior art all have different drawbacks. In the actual operation and treatment process, on the one hand, the exhaust gas treatment effect is not ideal, on the other hand, the treatment process will cause secondary pollution or potential safety hazards. The cost of waste gas treatment is difficult to control, and the operation cannot be implemented well.

Summary of the invention

In order to overcome the above technical problems, the present invention provides a papermaking waste gas treatment process, which has good treatment effect, low cost and easy realization.

In order to achieve the above objectives, the technical solutions provided by the present invention are as follows:

A papermaking waste gas treatment process. The process equipment includes a mist eliminator, a UV photolysis generator, an oxidation tower I, an oxidation tower II, an absorption tower, an ozone catalytic oxidation reaction tower, an induced draft fan, and a high-altitude exhauster. The air ducts are connected in sequence.

Preferably, the process equipment further includes an ozone generator, a hydrogen peroxide storage tank, a pump A, a caustic soda storage tank, and a pump B;

Among them, the ozone generator is connected to the oxidation tower I through a pipeline, and the oxygen source enters the oxidation tower 1 after passing through the ozone generator;

The hydrogen peroxide storage tank is connected to the pump A through the pipeline, and the pump A is connected to the oxidation tower II;

The caustic soda storage tank is connected to pump B through a pipeline, and pump B is connected to the absorption tower;

Preferably, the mist eliminator is equipped with a drainage pipe, which can directly discharge waste water to the trench;

Preferably, the hydrogen peroxide storage tank has a level gauge, the oxidation tower II and the hydrogen peroxide storage tank form a closed loop system through a pump A and a pipeline, the oxidation tower II is equipped with a pipeline to discharge liquid to the trench, and the hydrogen peroxide storage tank is equipped with a pipeline for adding Hydrogen peroxide medicine;

Preferably, the oxidation tower II is equipped with spray nozzles and temperature sensors;

Preferably, the absorption tower is an alkali spray absorption tower, the alkali spray absorption tower is equipped with spray nozzles, the caustic soda storage tank is equipped with a level gauge and a pH detector, and the alkali spray absorption tower and the caustic soda storage tank pass between the The pump and pipeline form a closed loop system, the alkali spray absorption tower is equipped with pipelines to discharge liquid to the trench, and the caustic soda storage tank has pipelines for adding caustic soda medicines.

Preferably, the UV solution generator is provided with a special C-wave UV 253.7nm, 185nm wavelength band ultraviolet light type ultraviolet lamp (150W amalgam quartz tube), and a catalyst nano titanium dioxide is provided at the same time;

Preferably, the lower part of the oxidation tower II contains 70-80% water. When it starts to work, an oxidant is added, and the circulating spray is performed at a flow rate of 50-150ml/h;

Preferably, the oxidant is one or two of hydrogen peroxide, potassium permanganate solution and potassium manganate solution;

Preferably, the concentration of the hydrogen peroxide is 20-30%, preferably 27.5%;

Preferably, the concentration of the potassium permanganate solution is 1-3%;

Preferably, the concentration of the potassium manganate solution is 2-4%;

Preferably, the oxidant is a mixture of potassium permanganate solution and potassium manganate solution;

Preferably, the mass ratio of the potassium permanganate solution to the potassium manganate solution is 3-5:1; preferably, the lower part of the absorption tower contains 70-80% water, and an alkaline solution is added during operation to The flow rate of 20-30ml/h is used for circulating spraying; preferably, the concentration of the added alkaline solution is 20-40%; preferably 30%;

Preferably, the alkaline solution is one or two of sodium hydroxide, sodium carbonate and potassium hydroxide;

Preferably, the alkaline solution is a mixed solution of sodium hydroxide and sodium carbonate;

Preferably, the mass ratio of the sodium hydroxide to sodium carbonate is 3-5:1;

Preferably, the alkaline solution is a mixed solution of potassium hydroxide and sodium carbonate;

Preferably, the mass ratio of the potassium hydroxide to the sodium carbonate is 2-4:1; preferably, the catalyst used in the ozone catalytic oxidation reaction tower is an O ₃ -RM type rare earth transition metal composite catalyst,

Preferably, the O ₃ -RM type rare earth transition metal composite catalyst uses honeycomb ceramics as a carrier and rare earth nano-oxides as active components.

Preferably, the rare earth nano-oxide is Nd ₂ O ₃ or La ₂ O ₃ .

Preferably, the mist eliminator is a corrugated plate mist eliminator, and a mixed material of steel mesh and PP (polypropylene) is used as a filler;

Preferably, the specific process of the papermaking waste gas treatment process is:

(1) The papermaking waste gas first passes through the mist eliminator to adsorb and remove the mist and dust in the waste gas. The generated waste water is directly discharged to the trench through the drainage pipe. The waste gas discharged from the mist eliminator enters the UV photolysis generator and undergoes UV photolysis. After the generator is post-treated, the odorous organic gas in the exhaust gas is cracked into free pollutant molecules, and then enters the oxidation tower I;

(2) After the oxygen source passes through the ozone generator, ozone is generated and enters the oxidation tower I to react with the pollutant molecules in the free state to generate small harmless or low-harm compounds (such as CO ₂ , H ₂ O, etc.);

(3) After treatment by oxidation tower I, the exhaust gas enters oxidation tower II, is sprayed and oxidized by hydrogen peroxide, and then enters the absorption tower for caustic soda spray to remove the acid gas in the exhaust gas, and the remaining exhaust gas enters the ozone catalytic oxidation reaction tower for further reaction and final treatment The generated gas is discharged at high altitude through the action of the induced draft fan.

Compared with the prior art, the technical advantages of the present invention are:

1) The present invention is directed to a papermaking waste gas treatment process, which has low treatment cost and good treatment effect, can effectively remove organic gas and solid-liquid particle waste in the waste gas, is simple to implement, and has low cost;

2) Collecting water mist on the discharged water vapor to remove the water droplets, which is more conducive to the effect of UV photolysis;

3) The principle of UV photocatalysis is to irradiate ultraviolet light to react on the surface of the catalyst to produce strong oxidizing substances such as hydroxyl radicals and ozone, thereby oxidizing and removing pollutants in the exhaust gas;

4) Oxygen passes through the ozone generator to produce ozone, which further oxidizes and removes pollutants in the exhaust gas;

5) The addition of hydrogen peroxide can not only have a certain sterilization effect, but also oxidize and remove the reducing pollutants in the exhaust gas to further purify the exhaust gas;

6) In the present invention, the ozone generator and the hydrogen peroxide treatment process are set at the same time, and the organic gas and reducing pollutants in the exhaust gas can be better treated by two oxidation treatments, which is beneficial to the advanced treatment of the exhaust gas;

7) Use alkaline spray to wash exhaust gas, remove acidic substances (containing organic and inorganic acidic substances) in exhaust gas through alkaline washing, and also remove acidic gas generated by previous oxidation;

8) Finally, add an ozone catalytic oxidation reaction tower through the induced draft fan before the exhaust gas is discharged, under the action of the catalyst, fully decompose the ozone produced by the UV photocatalytic oxidation equipment and the ozone generator to prevent the ozone from being discharged into the atmosphere;

9) The present invention adopts a chemical reaction method to treat waste gas, the treatment time is shortened, and the volume of the reaction vessel is small; at the same time, the treatment effect is improved; the cost of waste gas treatment is about 1.5 yuan/Km ³ .

Description of the drawings

Figure 1: Process flow chart of papermaking waste gas treatment;

The present invention will now be further described with reference to the drawings and embodiments:

detailed description

Example 1

The overall process flow of a papermaking waste gas treatment process is:

(3) After treatment by oxidation tower I, the exhaust gas enters oxidation tower II, is sprayed and oxidized by oxidant, and then enters the absorption tower for alkaline solution spraying to remove the acid gas in the exhaust gas, and the remaining exhaust gas enters the ozone catalytic oxidation reaction tower for further reaction. The gas produced after the final treatment is discharged at high altitude through the action of the induced draft fan.

Example 2

The process flow is the same as in Example 1. The intake air flow rate: working condition is 1000m ³ /h, and the odor of the inlet exhaust gas is dimensionless 773. After treatment by this set of equipment, the specific parameters are as follows:

(1) The corrugated plate mist eliminator uses a mixed material of steel mesh and PP (polypropylene) as the filler;

(2) UV photocatalytic oxidation reactor: special C-wave UV 253.7nm, 185nm band ultraviolet light type special ultraviolet lamp (150W amalgam quartz tube) for exhaust gas treatment, equipped with catalyst nano titanium dioxide.

(3) The size of the upper part of the oxidation tower I is ￠450mm*1400mm, and the size of the lower part is 600mm*600mm*800mm. It is connected to the ozone generator and the oxygen cylinder is supplied with gas. The gas supply is adjusted through the valve. The ozone smell can be smelled at the gas inlet of the 3# tower. , And there is no ozone odor at the final exhaust outlet.

(4) The size of the upper part of the oxidation tower II is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, and the lower part is filled with 80% of the volume of water, and then the hydrogen peroxide solution with the concentration of 27.5% is added, and the flow is 100ml/h, and pumped to the upper part Tower cyclic spraying.

(5) The size of the upper part of the alkali spray absorption tower is ￠450mm*1400mm, the size of the lower part is 600mm*700mm*800mm, and the volume of the lower part is 80% of water, and the mixed solution of sodium hydroxide and sodium carbonate with a concentration of 30% (sodium hydroxide The mass ratio with sodium carbonate is 5:1), with a flow rate of 25ml/h, pumped to the upper tower for circulating spray.

(6) The size of the ozone catalytic oxidation reaction tower is 400mm*300mm*800mm. The O ₃ -RM type rare earth transition metal composite catalyst is selected, the honeycomb ceramic is used as the carrier, and the nano-La ₂ O ₃ is the active component.

The dimensionless odor of the finally discharged gas is 72, and the organic matter removal rate can reach 90.69%.

Example 3

The process flow is the same as in Example 1. The intake air flow rate: working condition is 1000m3/h, and the odor of the inlet exhaust gas is dimensionless 773. After treatment by this set of equipment, the specific parameters are as follows:

(4) The size of the upper part of the oxidation tower II is ￠450mm*1400mm, and the size of the lower part is 600mm*700mm*800mm. The lower part is filled with 75% of the volume of water, and then a 20% hydrogen peroxide solution is added. The flow rate is 50ml/hour and pumped to the upper part. Tower cyclic spraying.

(5) The size of the upper part of the alkali spray absorption tower is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, and the lower part is filled with 70% of the volume of water, and the mixed solution of potassium hydroxide and sodium carbonate with a concentration of 40% (potassium hydroxide The mass ratio to sodium carbonate is 4:1), with a flow rate of 20ml/h, pumped to the upper tower for circulating spray.

(6) The size of the ozone catalytic oxidation reaction tower is 400mm*300mm*800mm. The O ₃ -RM type rare earth transition metal composite catalyst is selected, the honeycomb ceramic is used as the carrier, and the nano-Nd ₂ O ₃ is the active component.

The dimensionless odor of the finally discharged gas is 81, and the organic matter removal rate can reach 89.52%.

Example 4

(4) The size of the upper part of the oxidation tower Ⅱ is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, and the lower part is filled with 70% of the volume of water, and then a 30% hydrogen peroxide solution is added. The flow rate is 150ml/hour and pumped to the upper part. Tower cyclic spraying.

(5) The upper part of the alkali spray absorption tower is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, the lower part is 75% of the volume of water, and the mixed solution of sodium hydroxide and sodium carbonate with a concentration of 20% (sodium hydroxide The mass ratio to sodium carbonate is 3:1), with a flow rate of 30ml/h, pumped to the upper tower for circulating spray.

The dimensionless odor of the finally discharged gas is 78, and the organic matter removal rate can reach 89.91%.

Example 5

(4) The size of the upper part of the oxidation tower II is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, and the lower part is filled with 80% of the volume of water, and then the mixture of potassium permanganate solution and potassium manganate solution (among which, permanganate The concentration of potassium acid solution is 1%, the concentration of potassium manganate solution is 2%, the mass ratio of potassium permanganate to potassium manganate solution is 3:1), with a flow rate of 100ml/h, pumped to the upper tower for circulating spray Shower.

The dimensionless odor of the finally discharged gas is 57, and the organic matter removal rate can reach 92.63%.

Example 6

(3) The upper part of oxidation tower I has a size of ￠450mm*1400mm, and the lower part has a size of 600mm*600mm*800mm. It is connected to an ozone generator and supplied with oxygen from an oxygen cylinder. The amount of gas supplied is adjusted through a valve. The smell of ozone can be smelled at the gas inlet of the 3# tower. , And there is no ozone odor at the final exhaust outlet.

(4) The size of the upper part of the oxidation tower II is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, and the lower part is filled with 80% of the volume of water, and then the mixture of potassium permanganate solution and potassium manganate solution (among which, permanganate The concentration of potassium acid solution is 3%, the concentration of potassium manganate solution is 4%, the mass ratio of potassium permanganate to potassium manganate solution is 5:1), with a flow rate of 100ml/h, pumped to the upper tower for circulating spray Shower.

The dimensionless odor of the finally discharged gas is 59, and the organic matter removal rate can reach 92.37%.

Example 7

(5) The upper part of the alkali spray absorption tower is ￠450mm*1400mm, the lower part is 600mm*700mm*800mm, the lower part is 80% of the volume of water, and the 30% concentration of potassium hydroxide and sodium carbonate is added to the mixed solution (potassium hydroxide The mass ratio to sodium carbonate is 2:1), with a flow rate of 25ml/h, pumped to the upper tower for circulating spray.

(6) The size of the ozone catalytic oxidation reaction tower is 400mm*300mm*800mm. The O3-RM type rare earth transition metal composite catalyst is selected, the honeycomb ceramic is used as the carrier, and the nano-La ₂ O ₃ is the active component.

The dimensionless odor of the finally discharged gas is 61, and the organic matter removal rate can reach 92.11%.

Comparative example 1

Compared with Example 2, the process parameters are the same, and the treatment of oxidation tower II is not performed.

(3) After the oxidation tower I is treated, the exhaust gas enters the absorption tower for caustic soda spray to remove the acid gas in the exhaust gas, and the remaining exhaust gas enters the ozone catalytic oxidation reaction tower for further reaction, and the gas produced after the final treatment is discharged at high altitude through the action of the induced draft fan .

The dimensionless odor of the finally discharged gas is 162, and the organic matter removal rate can reach 79.04%.

Comparative example 2

Compared with Example 2, the process parameters are the same and the processing sequence is different.

The overall process flow of a papermaking waste gas treatment process is:

(1) The papermaking waste gas is first absorbed and removed by the mist and dust in the waste gas through a demister. The produced waste water is directly discharged to the trench through the drainage pipe. The waste gas discharged from the demister is oxidized in the oxidation tower II, and then oxidized by the hydrogen peroxide spray. Entering the UV photolysis generator, after post-treatment by the UV photolysis generator, the malodorous organic gas in the exhaust gas is cracked into free state pollutant molecules, and then enters the oxidation tower I;

The dimensionless odor of the last discharged gas is 197, and the organic matter removal rate can reach 74.51%.

Comparative example 3

Compared with Example 2, the only difference is that the spray flow rate of caustic soda is different, which is 10ml/h, the final odor of the discharged gas is dimensionless 107, and the organic matter removal rate can reach 86.16%.

Comparative example 4

Compared with Example 2, the only difference is that the spray flow rate of hydrogen peroxide is different, which is 30ml/h. The final odor of the discharged gas is dimensionless, and the organic matter removal rate can reach 82.54%.

Comparative example 5

Compared with Example 2, the only difference is that the corrugated plate mist eliminator uses steel wire mesh as the filler; the final odor of the discharged gas is dimensionless 146, and the organic matter removal rate can reach 81.11%.

The above detailed description is a specific description of one of the possible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the present invention. Within the scope of technical solutions.

Claims

A papermaking waste gas treatment process. The process equipment includes a mist eliminator, a UV photolysis generator, an oxidation tower I, an oxidation tower II, an absorption tower, an ozone catalytic oxidation reaction tower, an induced draft fan, and a high-altitude exhauster. The air pipes are connected in sequence;

The process equipment also includes an ozone generator, a hydrogen peroxide storage tank, a pump A, a caustic soda storage tank, and a pump B;

Among them, the ozone generator is connected to the oxidation tower I through a pipeline, and the oxygen source enters the oxidation tower I after passing through the ozone generator;

The hydrogen peroxide storage tank is connected to the pump A through the pipeline, and the pump A is connected to the oxidation tower II;

The caustic soda storage tank is connected to pump B through a pipeline, and pump B is connected to the absorption tower.
The treatment process according to claim 1, characterized in that the hydrogen peroxide storage tank has a level gauge, the oxidation tower II and the hydrogen peroxide storage tank form a closed loop system through a pump A and a pipeline, and the oxidation tower II is equipped with a pipeline discharge When the liquid goes to the trench, the hydrogen peroxide storage tank is equipped with a pipeline to add hydrogen peroxide medicine.
The treatment process according to claim 1, characterized in that the lower part of the oxidation tower II contains 70-80% water, and when it starts to work, an oxidant is added, and the circulating spray is performed at a flow rate of 50-150 ml/h.
The treatment process according to claim 1, wherein the absorption tower is an alkali spray absorption tower, the alkali spray absorption tower is equipped with spray nozzles, the caustic soda storage tank is equipped with a level gauge and a pH detector, and the alkali spray absorption tower is equipped with spray nozzles. A closed loop system is formed between the spray absorption tower and the caustic soda storage tank through pumps and pipelines. The alkali spray absorption tower is equipped with pipelines to discharge liquid to the trench, and the caustic soda storage tank has pipelines to add caustic soda chemicals.
The treatment process according to claim 1, wherein the UV solution generator is provided with a special C-wave UV 253.7nm, 185nm wavelength band ultraviolet light type ultraviolet lamp tube, and a catalyst nano titanium dioxide is also provided.
The treatment process according to claim 1, wherein the mist eliminator is a corrugated plate mist eliminator, and a mixed material of steel mesh and PP is used as a filler.
The treatment process according to claim 1, characterized in that the lower part of the absorption tower contains 70-80% water. When working, an alkaline solution is added, and the circulating spray is performed at a flow rate of 20-30ml/h. The concentration of the alkaline solution added is 20-40%.
The treatment process according to claim 1, wherein the catalyst used in the ozone catalytic oxidation reaction tower is an O 3 -RM type rare earth transition metal composite catalyst.
8. The treatment process according to claim 8, wherein the O 3 -RM type rare earth transition metal composite catalyst uses honeycomb ceramics as a carrier and rare earth nano-oxides as active components.
9. The treatment process according to claim 9, wherein the rare earth nano-oxide is Nd 2 O 3 or La 2 O 3 .