Method for treating biological fermentation malodorous waste gas through dynamic temperature rise adjustment and catalytic ozonation

Abstract

The invention provides a method for treating biological fermentation malodorous waste gas through dynamic heating adjustment and catalytic ozonation, and belongs to the field of waste gas treatment. The method for treating the biological fermentation malodorous waste gas through dynamic temperature rise adjustment and catalytic ozonation comprises the step of carrying out dehumidification treatment on the waste gas so that the relative humidity of the waste gas reaches a set range. Ozone is introduced into the waste gas, catalytic oxidation treatment is conducted on the waste gas under the action of a catalyst, organic matter in the waste gas is removed, and the catalyst comprises rare earth-transition metal composite oxide. According to the invention, the relative humidity of the waste gas is dynamically adjusted to 70%-95%, and the rare earth-transition metal composite oxide is used as the catalyst, so that under the action of the catalyst, the ozone can generate hydroxyl radicals, and malodorous organic matters can be thoroughly mineralized into CO2 and H2O, thereby providing the treatment effect of the waste gas and improving the treatment effect of the waste gas. Malodorous gas generated by biological fermentation is thoroughly treated, malodorous gas residues are avoided, and the waste gas treatment effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, in particular to a method for treating bio-fermentation malodorous waste gas by dynamic temperature adjustment ozone catalytic oxidation. BACKGROUND

[0002] Bio-fermentation malodorous waste gas is a very typical and difficult industrial waste gas problem. Its core features can be summarized as follows: complex composition, large concentration fluctuation, and high odor intensity. Bio-fermentation waste gas is not only a single substance, but a complex mixture of fermentation strains, culture medium components, and metabolic products.

[0003] Bio-fermentation malodorous waste gas mainly contains the following several categories, including sulfur-containing compounds such as hydrogen sulfide, methyl mercaptan, ethyl mercaptan, dimethyl disulfide, etc., which is one of the main sources of odor, with a very low threshold (even at a very low concentration, it can be smelled), and the smell is similar to rotten eggs and rotten cabbage; nitrogen-containing compounds such as ammonia, trimethylamine, indole, and skatole, ammonia has a strong irritating odor, while trimethylamine (fishy smell), indole, and skatole (fecal smell) are key components of odor; volatile organic compounds, including alcohols (ethanol, propanol), aldehydes (formaldehyde, acetaldehyde), ketones (acetone), organic acids (acetic acid, propionic acid), and esters, etc. Although some of these substances have a weak odor, but after mixing, they will produce complex sour and fermentation odor; volatile fatty acids such as acetic acid, propionic acid, and butyric acid, which have a strong irritating sour taste; water vapor and carbon dioxide: the fermentation process itself produces a large amount of carbon monoxide (CO) and water vapor, resulting in very high humidity of the waste gas.

[0004] Bio-fermentation malodorous waste gas has a large amount and a wide range of concentration fluctuations. In order to maintain a sterile positive pressure environment in the fermentation tank and discharge metabolic waste gas, a large amount of sterile air needs to be continuously introduced, resulting in a very large total amount of discharged waste gas; the concentration of waste gas pollutants is not constant throughout the fermentation cycle. In the early stage of fermentation, the concentration of pollutants is low due to the growth of bacteria; in the middle and late stages of fermentation, the bacteria metabolize a large amount of secondary metabolites, and the concentration of malodorous substances reaches a peak; in the end of fermentation and disinfection stage, the discharged waste gas may contain residues of disinfectants (such as formaldehyde), making the composition more complex and causing a wide range of concentration fluctuations.

[0005] Bio-fermentation malodorous waste gas has high humidity and temperature. The fermentation process needs to be carried out at appropriate temperature and humidity, and the discharged waste gas is usually in a saturated or near-saturated state, with humidity up to 95% or even higher, resulting in high humidity of the waste gas, which brings challenges to the subsequent treatment process, such as filter clogging, catalyst deactivation, and equipment corrosion. The fermentation process is usually an exothermic reaction, and the temperature of the waste gas is generally higher than the environmental temperature, between 30°C and 40°C, resulting in high temperature of the waste gas.

[0006] Biological fermentation produces malodorous waste gases with a strong odor effect and a low odor threshold. Many sulfur- and nitrogen-containing malodorous substances have extremely low odor thresholds (i.e., the lowest concentration at which a person can detect an odor). This means that even if the waste gas is treated and the pollutant concentration is reduced to a very low level (such as ppb), it may still be perceived as malodorous, causing serious impact on the surrounding environment of the factory area and easily triggering complaints from residents.

[0007] Based on the above characteristics of odorous waste gas from bio-fermentation, the treatment of bio-fermentation waste gas faces the following core challenges: dehumidification is a prerequisite, as high humidity is the "enemy" of many treatment technologies, and efficient pretreatment (such as condensation, cooling and dehumidification) is crucial; a combination of multiple technologies is inevitable, as a single technology can hardly remove all complex components efficiently at the same time; high resistance to shock loads is required, and the treatment system must be able to adapt to the periodic and drastic fluctuations in waste gas concentration and air volume; balancing odor removal and biosafety, the ideal treatment process should simultaneously achieve pollutant degradation, odor elimination, and microbial inactivation.

[0008] Common treatment process combinations include pretreatment, main treatment, and deep purification. First, the waste gas undergoes pretreatment, such as water washing, acid washing, or alkaline washing to remove some water-soluble substances and dust, followed by condensation and dehumidification. Next, main treatment is performed, typically using one or a combination of processes such as biological filtration, chemical scrubbing, activated carbon adsorption, low-temperature plasma, and photocatalytic oxidation to filter the waste gas. Finally, deep purification is performed, usually with an additional stage of activated carbon adsorption or advanced oxidation as a safeguard to remove odors.

[0009] However, traditional treatment methods are not very effective at removing odorous waste gas, and the problem of residual odor remains.

[0010] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0011] The purpose of this invention is to provide a method for dynamically adjusting the temperature and ozone catalytic oxidation to treat odorous waste gas from bio-fermentation, in order to solve the problem of poor odor removal effect and the continued generation of odorous gas.

[0012] To address the aforementioned technical problems, this invention provides a method for dynamically adjusting the temperature of ozone catalytic oxidation to treat odorous waste gas from bio-fermentation, comprising:

[0013] The exhaust gas is dehumidified so that the relative humidity of the exhaust gas reaches a set range;

[0014] Ozone is introduced into the waste gas, and the waste gas is subjected to catalytic oxidation treatment under the action of a catalyst to remove organic matter from the waste gas. The catalyst includes rare earth-transition metal composite oxides.

[0015] Preferably, the relative humidity of the exhaust gas is in the range of 70% to 95%.

[0016] Preferably, the relative humidity of the exhaust gas is controlled within a set range by dynamically adjusting the temperature of the exhaust gas.

[0017] Preferably, after dehumidification, the method further includes filtering the exhaust gas.

[0018] Preferably, the rare earth-transition metal composite oxide includes a lanthanum-doped composite metal oxide.

[0019] Preferably, the rare earth-transition metal composite oxide includes one of lanthanum-manganese-cerium oxide, lanthanum-iron-manganese oxide, lanthanum-copper-manganese oxide, or a combination thereof.

[0020] Preferably, the catalytic oxidation treatment is performed at room temperature.

[0021] Preferably, the actual amount of ozone added is 1 to 5 times the theoretical amount of organic matter required in the waste gas.

[0022] Preferably, the waste gas is introduced into a reactor for treatment. The reactor includes a shell, an inlet, an outlet, a sieve plate, a humidity sensor, a heating element, and a controller. The shell has a cavity, and the inlet and outlet are connected to the cavity. The sieve plate is connected to the inner wall of the shell and is used to support the catalyst. The humidity sensor and the heating element are disposed inside the shell, and the controller is disposed outside the shell. The humidity sensor is used to detect real-time data of the relative humidity of the waste gas. The controller is used to receive the data, determine the data, and output a control signal to the heating element. The heating element is used to receive the control signal.

[0023] Preferably, the humidity sensor and the heating element are electrically connected to the controller.

[0024] Compared with existing technologies, the method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation in this invention has the following advantages:

[0025] This invention dynamically adjusts the relative humidity of the exhaust gas to 70%~95% and uses rare earth-transition metal composite oxides as a catalyst. Under the action of the catalyst, ozone can generate hydroxyl radicals (i.e., ·OH). The generated hydroxyl radicals can rapidly and thoroughly mineralize malodorous organic matter into CO2 and H2O, or degrade it into harmless small molecules, thereby achieving deep deodorization and purification. Ozone is converted into a large amount of more oxidizing hydroxyl radicals through a chain reaction, rather than treating the exhaust gas by directly oxidizing organic matter with ozone. This improves the treatment effect of the exhaust gas, cleans up the malodorous gas produced by biological fermentation, avoids malodorous gas residue, and improves the exhaust gas treatment effect. Attached Figure Description

[0026] Figure 1 This is a flowchart of a method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from biological fermentation according to the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of the reactor in one embodiment of the present invention;

[0028] In the picture,

[0029] 100 - Housing; 110 - Air inlet;

[0030] 120 - Air outlet; 130 - Humidity sensor;

[0031] 140 - Controller; 150 - Sieve plate;

[0032] 160 - Heating element; 200 - Catalyst. Detailed Implementation

[0033] To make the objectives, advantages, and features of this invention clearer, the method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation, proposed in this invention, will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, used only to facilitate and clarify the illustration of the embodiments of this invention. It should be understood that the accompanying drawings do not necessarily show the specific structure of the invention to scale, and the illustrative features used to illustrate certain principles of the invention in the accompanying drawings are also drawn in a slightly simplified manner. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific environment in which they are applied and used. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different drawings to denote the same parts or parts having the same function, omitting repeated descriptions. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the description of this specification, descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] The present invention provides a method for dynamically adjusting the temperature to treat malodorous exhaust gas from biological fermentation by ozone catalytic oxidation. Refer Figure 1 and Figure 2 to a specific embodiment of a method for dynamically adjusting the temperature to treat malodorous exhaust gas from biological fermentation by ozone catalytic oxidation as disclosed. The method for dynamically adjusting the temperature to treat malodorous exhaust gas from biological fermentation includes the following steps S1 to S3.

[0037] Step S1: Pretreat the exhaust gas so that the relative humidity of the exhaust gas reaches a set range.

[0038] Refer Figure 1 and Figure 2 As shown, when treating the exhaust gas, first pretreat the exhaust gas so that the relative humidity of the exhaust gas reaches a set range. That is, dynamically adjust the relative humidity of the exhaust gas so that the relative humidity of the exhaust gas reaches a set range. The exhaust gas is the odor generated by biological fermentation, and the odor includes sulfur-containing compounds, nitrogen-containing compounds, volatile organic compounds (VOCs), etc. In specific implementation, first introduce the exhaust gas into the reactor.

[0039] In some embodiments, the reactor includes a shell 100, an inlet 110, an outlet 120, a sieve plate 150, a humidity sensor 130, a heating element 160, and a controller 140. The shell 100 has a cavity communicating with the inlet 110 and the outlet 120. Exhaust gas enters the shell 100 through the inlet 110, is treated, and then exits through the outlet 120. The sieve plate 150 is fixedly installed inside the shell 100. The sieve plate 150 is used to support the catalyst 200. The humidity sensor 130 is fixedly installed inside the shell 100, near the inlet 110, to facilitate real-time detection of the relative humidity of the exhaust gas. The humidity sensor 130 can be a resistive temperature sensor, a capacitive temperature sensor, or any other type of sensor capable of detecting the relative humidity of the exhaust gas. The heating element 160 is fixedly installed inside the shell 100 to heat the exhaust gas and dynamically adjust its relative humidity in real time. The heating element 160 can be any type, such as a heating wire, a thermistor, or a heating film, as long as it can heat the exhaust gas inside the housing 100. The controller 140 receives real-time data on the relative humidity of the exhaust gas detected by the humidity sensor 130, calculates and analyzes the real-time data, and outputs a control signal to the heating element 160. The heating element 160 then adjusts its output power based on the control signal output by the controller 140 to regulate the temperature at which it heats the exhaust gas. By adjusting the temperature, the relative humidity of the exhaust gas is regulated. The humidity sensor 130 and the heating element 160 are electrically connected to the controller 140. The controller 140 can be a PLC controller, a microcontroller, etc. The humidity sensor 130 and the heating element 160 can be controlled by the controller 140 via electrical signals, wireless transmission, or other means. The connection and control methods between the humidity sensor 130, heating element 160, and controller 140 are not specifically required, as long as they can achieve the functions of the humidity sensor 130, heating element 160, and controller 140. In this embodiment, it is preferable that the humidity sensor 130, heating element 160, and controller 140 are controlled by electrical signals. The formula for calculating relative humidity is as follows:

[0040] .

[0041] The relative humidity range of the waste gas is 70% - 95%. That is, in this embodiment, the relative humidity can be 70%, 80%, 90%, 95%, or any value within the range of 70% - 95%. If the relative humidity is less than 50%, when the waste gas is subjected to catalytic oxidation treatment, the organic matter in the waste gas is directly oxidized, and the treatment effect is not good. If the relative humidity is greater than 95%, especially when the relative humidity reaches saturation, although there are sufficient water molecules participating in the reaction during catalytic oxidation, the too-high relative humidity causes a water film to form on the catalyst surface, hindering the diffusion of the oxidant and pollutants to the active sites of the catalyst, and instead reducing the overall reaction rate. In liquid water, the mass transfer efficiency of ozone will also become a limiting factor. Therefore, either too high or too low relative humidity affects the treatment effect of the waste gas.

[0042] In this embodiment, the control process of the relative humidity of the waste gas is as follows:

[0043] First, set the control range of the relative humidity in the controller 140 to be 70% - 95%. Then, pass the waste gas from the air inlet 110 into the reactor. The humidity sensor 130 obtains the real-time relative humidity data of the waste gas, and then transmits the measured data to the controller 140. The controller 140 determines whether the measured data is within the set relative humidity range. If the measured data is greater than 95%, the controller 140 outputs a control signal to the heating element 160 to increase the output power of the heating element 160, so as to reduce the relative humidity of the waste gas by raising the temperature until the relative humidity of the waste gas is within 70% - 95%. If the measured data is less than 70%, the controller 140 outputs a control signal to the heating element 160 to reduce the output power of the heating element 160, so as to increase the relative humidity of the waste gas by lowering the temperature until the relative humidity of the waste gas is within 70% - 95%. It should be noted that for adjusting the relative humidity of the waste gas by temperature, as long as the temperature is increased by 1°C - 2°C or decreased by 1°C - 2°C, the relative humidity of the waste gas can change significantly. Therefore, in the actual temperature adjustment process, the adjustment range of the temperature is very small and has almost no impact on the catalytic activity of the catalyst.

[0044] Step S2: Filter the waste gas.

[0045] As shown Figure 1 When the relative humidity of the waste gas is within 70% - 95%, then, filter the waste gas to remove dust and some water-soluble substances in the waste gas. In some embodiments, for example, dust and some water-soluble substances can be removed by means such as water washing, acid washing, and alkali washing. Filtering the waste gas is already familiar to those skilled in the art and will not be elaborated in detail here. It should be noted that the waste gas can also be filtered and removed before it is introduced into the reactor to remove dust and some water-soluble substances in the waste gas.

[0046] Step S3: Introduce ozone into the waste gas and perform catalytic oxidation treatment on the waste gas under the action of a catalyst to remove organic substances in the waste gas. The catalyst is a rare earth-transition metal composite oxide.

[0047] See Figure 1 and Figure 2 As shown, introduce ozone into the reactor. The actual addition amount of ozone is 1 to 5 times the theoretical requirement for the reaction of organic substances in the waste gas. In actual production, the concentration of ozone is generally greater than or equal to 94%. When the inlet gas volume of the waste gas is determined (for example, 1000 ppm), then according to the inlet gas volume of the waste gas and the reaction formula of the waste gas and ozone, the molar amount of ozone theoretically required can be calculated. Through the molar amount of ozone theoretically required and the concentration of ozone, the inlet gas volume of ozone can be obtained. It should be noted that in order to completely mineralize harmful substances in the waste gas, the actual amount of ozone introduced is 1 to 5 times the theoretical requirement. In this embodiment, 200 packages of the catalyst are rare earth-transition metal composite oxides. Further, the rare earth-transition metal composite oxide includes lanthanum-doped composite metal oxides. The lanthanum-doped composite metal oxides combine two or more metal oxides, and by utilizing the synergistic effect, often better activity and stability than single oxides can be obtained. Even further, the rare earth-transition metal composite oxide includes lanthanum-manganese-cerium-oxide (La-Mn-Ce-O x ), lanthanum-iron-manganese-oxide (La-Fe-Mn-O x ), lanthanum-copper-manganese-oxide (La-Cu-Mn-O x ), or a combination thereof. Taking lanthanum-manganese-cerium-oxide as the catalyst, lanthanum as the rare earth element has good oxygen storage capacity and thermal stability, and cerium combines good oxygen storage capacity with the high activity of manganese, improving the catalytic performance of the catalyst. Taking lanthanum-iron-manganese-oxide as the catalyst, lanthanum as the rare earth element has good oxygen storage capacity and thermal stability, manganese has high activity, iron has thermal stability, and the cost of iron is reduced, which can reduce the cost while improving the catalytic activity. Taking lanthanum-copper-manganese-oxide as the catalyst, combining the oxygen storage capacity and thermal stability of lanthanum, manganese has high activity, and copper also has thermal stability, which can also improve the catalytic activity of the catalyst.

[0048] In this embodiment, by dynamically controlling the humidity of the waste gas at 70% - 95%, under the action of the catalyst, an initiation reaction is first generated, and ozone (O3) decomposes under the action of hydroxide ions (OH - ), generating hydroperoxide ions (HO2) and superoxide anion radicals (O2 - ). Then a propagation reaction occurs, where water and superoxide anion radicals (O2 -This will promote the continuous conversion of ozone into hydroxyl radicals (·OH).

[0049] The specific chain reaction process is as follows: O3 + OH - →HO2·+O2 - ;

[0050] O3+O2 - →O3 - +O2;

[0051] O3 - +H + →HO3·;

[0052] HO3·→·OH+O2;

[0053] The generated hydroxyl radicals (·OH) can rapidly and thoroughly mineralize malodorous organic matter (sulfides, amines, VOCs, etc.) into CO2 and H2O, or degrade them into harmless small molecules, thereby achieving deep deodorization and purification. Ozone will be converted into a large amount of more oxidizing hydroxyl radicals through the above chain reaction, rather than treating the waste gas by directly oxidizing organic matter with ozone. This can improve the treatment effect of waste gas, clean up the malodorous gas produced by biological fermentation, avoid the generation of malodorous gas, and improve the waste gas treatment effect.

[0054] It should be noted that the above chain reaction is carried out at room temperature without any heating treatment. In step S1, the heating element 160 only needs to be increased by 1°C to 2°C to significantly change the relative humidity of the exhaust gas when dynamically adjusting its relative humidity. Therefore, the temperature change mentioned above is only for adjusting the relative humidity of the exhaust gas, not for increasing the reaction temperature to catalyze the oxidation reaction.

[0055] The catalyst accelerates the aforementioned chain reaction, lowers the activation energy, and thus efficiently generates active species (i.e., ·OH) under a wider range of conditions (including lower humidity, for example, at a relative humidity of 70%). This method can treat waste gas at room temperature without requiring catalyst heating, thereby reducing reaction energy consumption.

[0056] When the humidity of the exhaust gas is too low (e.g., less than 50%), there are insufficient water molecules in the gas phase, making it impossible to effectively initiate and maintain the aforementioned chain reaction. Ozone molecules will react with organic matter more often through direct oxidation. This reaction is selective, slow, and ineffective against certain pollutants (such as halogenated hydrocarbons and alcohols), resulting in incomplete odor treatment and residual odor. When the humidity of the exhaust gas is too high (e.g., greater than 95%, especially when saturated), although there are sufficient water molecules, excessive humidity may cause a water film to form on the catalyst surface, hindering the diffusion of ozone and pollutants to the catalyst's active sites, thus reducing the overall reaction rate. In liquid water, the mass transfer efficiency of ozone also becomes a limiting factor, causing ozone molecules to react with organic matter more often through direct oxidation. Similarly, this results in incomplete odor treatment and residual odor.

[0057] However, in this application, by dynamically adjusting the relative humidity of the exhaust gas to 70%~95% and using rare earth-transition metal composite oxides as a catalyst, the above-mentioned chain reaction can be accelerated under the action of the catalyst, reducing the activation energy of the reaction. This allows for the efficient generation of active species (i.e., ·OH) even under broader conditions (including lower humidity, for example, relative humidity of 70%~95%). Under the action of the catalyst, ozone molecules continuously generate a large number of hydroxyl radicals according to the above-mentioned chain reaction. These hydroxyl radicals can rapidly and thoroughly mineralize malodorous organic matter (sulfides, amines, VOCs, etc.) into CO2 and H2O, or degrade them into harmless small molecules, thereby achieving deep deodorization and purification. Ozone is converted into a large amount of more oxidizing hydroxyl radicals through the above-mentioned chain reaction, rather than treating the exhaust gas through direct oxidation of organic matter with ozone. This improves the treatment effect of the exhaust gas, effectively treating the malodorous gas produced by biological fermentation, avoiding the generation of malodorous gas, and improving the exhaust gas treatment efficiency.

[0058] In summary, the above embodiments have provided detailed descriptions of different configurations of the method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation. Of course, the above descriptions are only descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention in any way. The present invention includes, but is not limited to, the configurations listed in the above embodiments. Those skilled in the art can draw inferences from the above embodiments. Any changes or modifications made by those skilled in the art based on the above disclosure are within the scope of protection of the claims.

Claims

1. A method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation, characterized in that, include: The exhaust gas is dehumidified so that the relative humidity of the exhaust gas reaches a set range; Ozone is introduced into the waste gas, and the waste gas is subjected to catalytic oxidation treatment under the action of a catalyst to remove organic matter from the waste gas. The catalyst includes rare earth-transition metal composite oxides.

2. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 1, characterized in that, The relative humidity range of the exhaust gas is 70% to 95%.

3. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 2, characterized in that, The relative humidity of the exhaust gas is controlled within a set range by dynamically adjusting the temperature of the exhaust gas.

4. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 1, characterized in that, After dehumidification, the method also includes filtering the exhaust gas.

5. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 1, characterized in that, The rare earth-transition metal composite oxide includes lanthanum-doped composite metal oxides.

6. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 5, characterized in that, The rare earth-transition metal composite oxide includes one of lanthanum-manganese-cerium oxide, lanthanum-iron-manganese oxide, lanthanum-copper-manganese oxide, or a combination thereof.

7. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 1, characterized in that, The catalytic oxidation treatment is performed at room temperature.

8. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 1, characterized in that, The actual amount of ozone added is 1 to 5 times the theoretical amount required for the reaction of organic matter in the waste gas.

9. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 1, characterized in that, Waste gas is introduced into a reactor for treatment. The reactor includes a shell, an inlet, an outlet, a sieve plate, a humidity sensor, a heating element, and a controller. The shell has a cavity, and the inlet and outlet are connected to the cavity. The sieve plate is connected to the inner wall of the shell and is used to support the catalyst. The humidity sensor and the heating element are located inside the shell, and the controller is located outside the shell. The humidity sensor is used to detect the real-time relative humidity data of the waste gas. The controller is used to receive the data, determine the data, and then output a control signal to the heating element. The heating element is used to receive the control signal.

10. The method for dynamically adjusting ozone catalytic oxidation to treat odorous waste gas from bio-fermentation according to claim 9, characterized in that, The humidity sensor and heating element are electrically connected to the controller.

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