Malodorous gas treatment system and method based on spraying coupling micro-nano hydroxyl

Abstract

The invention discloses a malodorous gas treatment system and method based on spray coupling micro-nano hydroxyl, the system comprises a malodorous gas collection device, a multi-stage spray tower, an ozone generator or pure oxygen supply device, a micro-nano bubble generator, a circulating water tank and an exhaust device, and the method comprises the following steps: introducing malodorous gas into the spray tower; and meanwhile, the generated micro-nano ozone / oxygen bubble solution is sprayed in a countercurrent manner, and high-activity hydroxyl radicals generated by bubble collapse are utilized to oxidize and decompose malodorous substances. According to the invention, through a synergistic effect mechanism among the micro-nano bubbles, the hydroxyl radicals and the packing layer of the spray tower, the micro-nano bubbles are used as an efficient generator of the hydroxyl radicals; the filler layer not only increases the gas-liquid contact area, but also serves as a disperser and a collapse field of micro-nano bubbles, hydroxyl radicals are locally enriched on the surface and in pores of the filler layer, and the mass transfer and oxidation reaction efficiency is greatly enhanced. Therefore, the malodorous substances in the malodorous gas can be effectively oxidized and decomposed.

Description

Technical Field

[0001] This application belongs to the field of waste gas treatment technology, specifically relating to an odor gas treatment system and method based on spray coupling of micro-nano hydroxyl groups. Background Technology

[0002] Odorous gases are widely generated in wastewater treatment, waste transfer, and chemical production processes. Their composition is complex, often containing hydrogen sulfide, ammonia, mercaptans, and VOCs, making them difficult to treat. Traditional treatment methods, such as biological filters, activated carbon adsorption, and chemical scrubbing, suffer from problems including large footprint, significant susceptibility to temperature and humidity fluctuations, the need for regular replacement of packing materials or chemicals, high operating costs, and difficulty in handling high-concentration intermittent shock loads.

[0003] Micro- and nanobubble technology is a highly efficient mass transfer and reaction technology that has emerged in recent years. Micro- and nanobubbles (typically with diameters of 1-1000 nanometers) possess characteristics such as large specific surface area, long residence time in water, self-pressurization and dissolution, and surface charging. More importantly, the instantaneous collapse of micro- and nanobubbles in water generates extremely high temperatures and pressures at the gas-liquid interface, thereby stimulating the production of a large number of highly oxidizing hydroxyl radicals (·OH). The redox potential of hydroxyl radicals is as high as 2.8V, which can non-selectively oxidize and decompose most malodorous organic compounds into harmless substances such as CO2 and H2O.

[0004] Currently, micro- and nano-bubble technology has been widely used in water treatment, but its application in odor control is still lacking. The key technical problem this invention aims to solve is to combine the characteristics of micro- and nano-bubbles with the needs of odor control, particularly how to efficiently generate hydroxyl radicals within a system and ensure their full contact and reaction with the odorous gases. Summary of the Invention

[0005] The primary objective of this invention is to overcome the shortcomings of existing technologies and provide a system and method for treating odorous gases that is highly efficient, adaptable, and cost-effective. The core objective of this invention is to reveal and utilize the synergistic mechanism of interaction and mutual promotion among micro / nano bubbles, hydroxyl radical generation, and the spray tower packing layer to achieve efficient and stable removal of odorous gases.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an odor gas treatment system based on spray-coupled micro / nano hydroxyl radicals, comprising an odor gas collection device, a multi-stage spray tower, an ozone generator or pure oxygen supply device, a micro / nano bubble generator, a circulating water tank, and an exhaust device, wherein:

[0008] The odor gas collection device is installed at the odor source to collect the odor gas in the odor source and transport it to the multi-stage spray tower;

[0009] The multi-stage spray towers are connected in series, and each spray tower has multiple layers of packing material and a spraying device located above the packing material. Each spray tower has a first air inlet for inputting gas on one side of its bottom.

[0010] An ozone generator or pure oxygen supply device is connected to a second air inlet on the micro-nano bubble generator to provide ozone or pure oxygen to the micro-nano bubble generator.

[0011] The micro-nano bubble generator is connected to the spraying device in the spray tower through a circulating water tank, thus forming a micro-nano bubble water circulation path;

[0012] The exhaust device is connected to the air outlet at the top of the last-stage spray tower to discharge the treated gas from the system.

[0013] The circulating water tank is equipped with an oxygen content sensor to monitor the oxygen content in the micro-nano bubble circulating solution in the circulating water tank, and to replenish the ozone / pure oxygen content in a timely manner through the micro-nano bubble generator.

[0014] The exhaust system includes an induced draft fan and an exhaust stack. The inlet of the induced draft fan is connected to the outlet at the top of the spray tower, and the outlet of the induced draft fan is connected to the inlet of the exhaust stack. The induced draft fan and the exhaust stack are used to discharge the gas treated by the last stage of the spray tower from the system.

[0015] The spray tower is filled with at least three layers of packing material. The packing material in each layer is at least one of Pall rings, Raschig rings, or multifaceted hollow spheres. Since Pall rings, Raschig rings, or multifaceted hollow spheres have a large specific surface area and complex structure, they can collide, cut, and redistribute falling droplets, thereby further breaking down and dispersing micro- and nano-bubbles. This increases the probability of contact between bubbles and odorous gases and may induce more bubbles to collapse on their surface. As a result, a high concentration of ·OH is generated on-site and efficiently on the surface of the packing material and in its pores, making the packing layer a "dynamic, free radical reaction field throughout the tower". Setting multiple layers of packing material can further increase the contact area and residence time between odorous gases and micro- and nano-bubble solutions, thereby improving the treatment efficiency of a single-stage spray tower.

[0016] Secondly, the present invention provides a method for treating odorous gases based on the above-described system. The method treats odorous gases using the aforementioned odorous gas treatment system, and includes the following steps:

[0017] S100: Use an odorous gas collection device to pump the odorous gas from the odor source to the bottom of the first-stage spray tower;

[0018] S200. Ozone or pure oxygen generated by an ozone generator or pure oxygen supply device is introduced into a micro-nano bubble generator to generate a micro-nano bubble solution, wherein the bubble diameter in the micro-nano bubble solution is in the range of 1-200 nanometers.

[0019] S300: The micro-nano bubble solution is sent to the spraying device at the top of the spray tower through the circulating water tank and sprayed downwards, so that the micro-nano bubble solution comes into contact with the odorous gas flowing upwards in the countercurrent in the packing layer of the spray tower and reacts, thereby using the hydroxyl free radicals generated by the collapse of micro-nano bubbles to oxidize and decompose the odorous substances.

[0020] S300' The micro-nano bubble solution discharged from the bottom of the spray tower is returned to the spray device at the top of the corresponding spray tower through the circulating water tank, realizing the recycling of the micro-nano bubble solution. The oxygen content sensor is used to monitor the oxygen content of the micro-nano bubble solution in the circulating water tank, and the start and stop of the nano bubble generator is controlled according to the oxygen content of the micro-nano bubble solution, thereby maintaining the ability of the system to generate hydroxyl free radicals.

[0021] S400: The system uses an exhaust device to discharge the gas purified by the multi-stage spray tower.

[0022] The technology provided by this invention is not a simple superposition of the functions of various components, but rather reveals a dynamic, efficient, and mutually reinforcing synergistic mechanism among the "micro-nano bubbles—hydroxyl radicals—filler layer":

[0023] (I) Synergy between micro / nano bubbles and hydroxyl radicals, i.e., synergy between "source" and "effect":

[0024] 1. Micro- and nano-bubbles as highly efficient generators of hydroxyl radicals: Their large specific surface area and long residence time ensure efficient dissolution of ozone or oxygen, providing sufficient reactants for free radical generation. The localized high-temperature and high-pressure environment generated when the bubbles collapse is the physical basis for the generation of a large amount of ·OH.

[0025] 2. The effectiveness of hydroxyl radicals as a manifestation of micro / nano bubble technology: The strong oxidizing property of ·OH directly and completely decomposes malodorous substances dissolved in the liquid phase, avoiding the accumulation of intermediate products and realizing the efficient conversion of energy (collapse energy) of micro / nano bubble technology into chemical oxidation energy. The ozone micro / nano bubble system can further induce a chain reaction (O3→·OH), further improving oxidation efficiency.

[0026] (II) Synergy between micro / nano bubbles / hydroxyl radicals and filler layers, i.e., synergy between "reaction" and "mass transfer":

[0027] 1. The packing layer acts as a "dispersant" and "collapse field" for micro and nano bubbles: The huge specific surface area and complex structure of the packing (such as Pall rings, Raschig rings, and multifaceted hollow spheres) have the effect of collision, cutting, and redistribution on falling droplets. This process further breaks and disperses the micro and nano bubbles, increases the probability of bubbles contacting malodorous gases, and may induce more bubbles to collapse on its surface. This results in the on-site and efficient generation of high concentrations of ·OH on the surface of the packing and in its pores, making the packing layer a "dynamic, free radical reaction field throughout the tower".

[0028] 2. The packing layer acts as an "enhancer" for gas-liquid mass transfer and reaction: Traditional packing layers only increase the contact area and residence time. In this invention, the packing layer, due to the above-mentioned effects, possesses the dual functions of "mass transfer enhancement" and "reaction generation." When malodorous gases pass through the moist packing layer, they are not only absorbed by the liquid but also directly oxidized by the newly generated ·OH on and near the packing surface, achieving simultaneous "absorption" and "oxidation," greatly improving the efficiency of single-stage treatment.

[0029] (III) Synergy between multi-stage spray towers and the overall process, i.e., synergy between "process" and "control":

[0030] 1. A multi-stage (no less than two-stage) spray tower is set up to form a graded oxidation and deep purification process. The first-stage tower mainly removes high-concentration and easily oxidized substances, while the second-stage and subsequent towers perform fine treatment and ensure quality. This layout makes the oxidation load of each stage more reasonable and has a stronger ability to cope with concentration fluctuations. Moreover, the recycling of micro-nano bubble water maximizes the utilization rate of oxidant (ozone / oxygen) and water.

[0031] 2. Periodically turning on the micro-nano bubble generator to replenish the oxidant maintains the stability of the oxidation potential in the circulating liquid, achieving process continuity and stability. This circulation mode, combined with the packing layer, makes the entire system a highly efficient "oxidation reactor" rather than a simple "absorption tower".

[0032] Therefore, compared with the prior art, the present invention has the following significant advantages:

[0033] (1) Extremely high treatment efficiency: Relying on the synergistic mechanism of the three, the generation and utilization efficiency of hydroxyl radicals are maximized, the malodorous substances are thoroughly removed, and there is no secondary pollution.

[0034] (2) Strong resistance to shock loads: It is not significantly affected by fluctuations in inlet gas concentration and temperature, and is particularly suitable for treating high-concentration, intermittently occurring malodorous gases.

[0035] (3) Low operating cost and high level of intelligence: No additional chemical deodorizer is required, only electricity is needed. The micro-nano bubble generator can be started and stopped intermittently to replenish the oxidant, making it easy to achieve fully automatic intelligent control.

[0036] (4) Highly adaptable and small footprint: The system is highly modular and is particularly suitable for the treatment of small distributed odor sources with limited space. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a structural diagram of the odor gas treatment system based on spray-coupled micro / nano hydroxyl groups provided in this application.

[0039] Figure 2 The flowchart illustrates the odor gas treatment method based on spray coupling of micro / nano hydroxyl groups provided by this invention.

[0040] In the picture:

[0041] 1. Odor gas collection device; 2. Spray tower; 21. Packing layer; 22. Spraying device; 3. Ozone generator or pure oxygen supply device; 4. Micro-nano bubble generator; 5. Circulating water tank; 61. Exhaust fan; 62. Exhaust stack; 7. Oxygen content sensor. Detailed Implementation

[0042] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is also expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​1 and 2 are listed, and if maximum range values ​​3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the resin range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the resin range "0-5" indicates that all real numbers between "0-5" have been listed in this document; "0-5" is simply a shortened representation of these resin combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0043] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0044] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0045] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way.

[0046] like Figure 1 As shown, the odor gas treatment system based on spray-coupled micro / nano hydroxyl groups provided in this application includes an odor gas collection device 1, a multi-stage spray tower 2, an ozone generator or pure oxygen supply device 3, a micro / nano bubble generator 4, a circulating water tank 5, and an exhaust device, wherein:

[0047] Odor gas collection device 1 is installed at the odor source to collect odor gas in the odor source and transport it to the multi-stage spray tower 2;

[0048] The multi-stage spray towers 2 are connected in series, and each stage of the spray tower 2 is provided with multiple layers of packing 21 and a spraying device 22 located above the packing layer. Each stage of the spray tower 2 is provided with a first air inlet for inputting gas on one side of the bottom of the tower.

[0049] The ozone generator or pure oxygen supply device 3 is connected to the second air inlet provided on the micro-nano bubble generator 4 to provide ozone or pure oxygen to the micro-nano bubble generator 4.

[0050] The micro-nano bubble generator 4 is connected to the spraying device 22 in the spray tower 2 through the circulating water tank 5, thereby forming a micro-nano bubble water circulation path;

[0051] The exhaust device is connected to the exhaust port at the top of the last-stage spray tower 2 to discharge the treated gas from the system.

[0052] In this system, odorous gases from the odor source are collected by an odor gas collection device 1 and introduced into the bottom of the first-stage spray tower 2 through the first inlet. Simultaneously, a micro-nano bubble generator 4 uses ozone or pure oxygen provided by an ozone generator or pure oxygen supply device 3 to generate micro-nano ozone bubble water or micro-nano pure oxygen bubble water. This is then transported through a circulating water tank 5 to the spray device 22 at the top of the multi-stage spray tower 2 for spraying. The spray liquid passes through multiple layers of packing material 21 within the spray tower 2 and collects at the bottom of the corresponding spray tower, ultimately returning to the circulating water tank 5 to continue circulating. After the odorous gases are purified and treated to meet standards by the multi-stage spray tower 2, they are discharged from the system using an exhaust device. Throughout the process, the micro-nano bubble generator 4 intermittently activates based on oxygen content monitoring by an oxygen content sensor 7 located in the circulating water tank 5 to replenish consumed ozone or pure oxygen and maintain the system's oxidation capacity.

[0053] To further illustrate the working principle and technical effects of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0054] Example 1

[0055] (1) The odorous gas from the odor source is pumped to the bottom of the first-stage spray tower 2 using the odorous gas collection device 1. The total amount of odorous gas treated is 20,000 m³. 3 / h;

[0056] (2) The ozone or pure oxygen generated by the ozone generator or pure oxygen supply device 3 is introduced into the micro-nano bubble generator 4 to generate a micro-nano bubble solution, wherein the bubble diameter in the micro-nano bubble solution is 1 nanometer.

[0057] (3) The micro-nano bubble solution is sent to the spray device 22 at the top of the multi-stage spray tower 2 through the circulating water tank 5 and sprayed downwards, so that the micro-nano bubble solution and the odorous gas flowing upwards in the countercurrent can contact and react in the packing layer 21 of the spray tower 2, and then the hydroxyl radicals generated by the collapse of the micro-nano bubbles are used to oxidize and decompose the odorous substances; at the same time, the micro-nano bubble solution discharged from the bottom of the spray tower 2 is returned to the spray device 22 at the top of the corresponding spray tower 2 through the circulating water tank 5, so as to realize the recycling of the micro-nano bubble solution, and the oxygen content sensor 7 is used to monitor the oxygen content of the micro-nano bubble solution in the circulating water tank 5, and the start and stop of the nano bubble generator 4 are controlled according to the oxygen content of the micro-nano bubble solution, so as to maintain the ability of hydroxyl radicals to be generated in the system.

[0058] (4) Use an exhaust device to discharge the gas purified by the multi-stage spray tower 2 from the system.

[0059] Example 2

[0060] (1) The odorous gas from the odor source is pumped to the bottom of the first-stage spray tower 2 using the odorous gas collection device 1. The total amount of odorous gas treated is 6000 m³. 3 / h;

[0061] (2) The ozone or pure oxygen generated by the ozone generator or pure oxygen supply device 3 is introduced into the micro-nano bubble generator 4 to generate a micro-nano bubble solution, wherein the bubble diameter in the micro-nano bubble solution is 200 nanometers.

[0062] (3) The micro-nano bubble solution is sent to the spray device 22 at the top of the multi-stage spray tower 2 through the circulating water tank 5 and sprayed downwards, so that the micro-nano bubble solution and the odorous gas flowing upwards in the countercurrent can contact and react in the packing layer 21 of the spray tower 2, and then the hydroxyl radicals generated by the collapse of the micro-nano bubbles are used to oxidize and decompose the odorous substances; at the same time, the micro-nano bubble solution discharged from the bottom of the spray tower 2 is returned to the spray device 22 at the top of the corresponding spray tower 2 through the circulating water tank 5, so as to realize the recycling of the micro-nano bubble solution, and the oxygen content sensor 7 is used to monitor the oxygen content of the micro-nano bubble solution in the circulating water tank 5, and the start and stop of the nano bubble generator 4 are controlled according to the oxygen content of the micro-nano bubble solution, so as to maintain the ability of hydroxyl radicals to be generated in the system.

[0063] (4) Use an exhaust device to discharge the gas purified by the multi-stage spray tower 2 from the system.

[0064] Example 3

[0065] (1) The odorous gas from the odor source is pumped to the bottom of the first-stage spray tower 2 using the odorous gas collection device 1. The total amount of odorous gas treated is 2000 m³. 3 / h;

[0066] (2) The ozone or pure oxygen generated by the ozone generator or pure oxygen supply device 3 is introduced into the micro-nano bubble generator 4 to generate a micro-nano bubble solution, wherein the bubble diameter in the micro-nano bubble solution is 100 nanometers.

[0067] (3) The micro-nano bubble solution is sent to the spray device 22 at the top of the multi-stage spray tower 2 through the circulating water tank 5 and sprayed downwards, so that the micro-nano bubble solution and the odorous gas flowing upwards in the countercurrent can contact and react in the packing layer 21 of the spray tower 2, and then the hydroxyl radicals generated by the collapse of the micro-nano bubbles are used to oxidize and decompose the odorous substances; at the same time, the micro-nano bubble solution discharged from the bottom of the spray tower 2 is returned to the spray device 22 at the top of the corresponding spray tower 2 through the circulating water tank 5, so as to realize the recycling of the micro-nano bubble solution, and the oxygen content sensor 7 is used to monitor the oxygen content of the micro-nano bubble solution in the circulating water tank 5, and the start and stop of the nano bubble generator 4 are controlled according to the oxygen content of the micro-nano bubble solution, so as to maintain the ability of hydroxyl radicals to be generated in the system.

[0068] (4) Use an exhaust device to discharge the gas purified by the multi-stage spray tower 2 from the system.

[0069] Comparative Example 1

[0070] Activated carbon adsorption method for treating odorous gases, with a total odor gas treatment capacity of 2000 m³. 3 The odorous gas is collected and then adsorbed by two stages of activated carbon. The activated carbon used is honeycomb activated carbon with an iodine value greater than 650. After treatment by activated carbon adsorption, the gas is discharged only after meeting the standards. In this treatment method, the activated carbon is easily damaged and ineffective due to the influence of moisture in the odorous gas. It usually needs to be replaced every 1 to 3 months. The replaced activated carbon needs to be disposed of as hazardous waste, which increases the company's operating costs and environmental management risks.

[0071] Comparative Example 2

[0072] Biological filtration is currently the mainstream technology for treating large volumes of odorous gases, with a total treatment capacity of 20,000 m³. 3 The odorous gases are collected and then enter a biological filter for deodorization treatment. After treatment by the biological filter, the gases are discharged only after meeting the standards. In this treatment method, the microorganisms in the biological filter are easily affected by fluctuations in gas concentration, and once the system is running, it cannot be stopped, otherwise a large number of microorganisms in the biological filter will die, leading to maintenance difficulties and making it impossible to guarantee long-term stable compliance. In addition, the biological filter process is very expensive, making it unsuitable for small-scale deodorization sites.

[0073] The inlet and outlet concentrations of Examples 1-3 and Comparative Examples 1-2 were collected and detected respectively, and the processing efficiency of the corresponding treatment methods was calculated based on the corresponding detection results. See Table 1 for details. The odor concentration in Table 1 has no unit. Odor concentration is an index that quantifies the intensity of odor based on the olfactory organ test method. The dilution factor when the odor sample is continuously diluted with odorless clean air to the olfactory threshold is called odor concentration.

[0074] Table 1. Treatment efficiency of odor gas treatment methods in Examples 1-3 and Comparative Examples 1-2.

[0075]

[0076]

[0077] As can be seen from Table 1, the treatment efficiency of odorous gases in Examples 1-3 is greater than 86%, reaching a maximum of 95%, while the treatment efficiency of odorous gases in Comparative Examples 1 and 2 is less than 70%. Moreover, the treatment efficiency of hydrogen sulfide in Examples 1-3 can reach more than 95%, and the treatment efficiency of ammonium can reach more than 94%, while the treatment efficiency of hydrogen sulfide in Comparative Examples 1 and 2 is only 86%, and the treatment efficiency of ammonium is only 66%. Therefore, the odorous gas treatment method based on spray coupling micro-nano hydroxyl groups provided by the present invention has a much better effect on the treatment of odorous gases than the treatment efficiency of existing technology methods, indicating that the odorous gas treatment system and method based on spray coupling micro-nano hydroxyl groups provided by the present invention can effectively purify odorous gases.

[0078] The above provides a detailed description of an odor gas treatment system and method based on spray-coupled micro / nano hydroxyl groups provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application; the descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An odor gas treatment system based on spray-coupled micro / nano hydroxyl groups, characterized in that, This includes an odor gas collection device, a multi-stage spray tower, an ozone generator or pure oxygen supply device, a micro / nano bubble generator, a circulating water tank, and an exhaust system, wherein: The odor gas collection device is installed at the odor source to collect the odor gas in the odor source and transport it to the multi-stage spray tower; The multi-stage spray towers are connected in series, and each spray tower has multiple layers of packing material and a spraying device located above the packing material. Each spray tower has a first air inlet for inputting gas on one side of its bottom. An ozone generator or pure oxygen supply device is connected to a second air inlet on the micro-nano bubble generator to provide ozone or pure oxygen to the micro-nano bubble generator. The micro-nano bubble generator is connected to the spraying device in the spray tower through a circulating water tank, thus forming a micro-nano bubble water circulation path; The exhaust device is connected to the air outlet at the top of the last-stage spray tower to discharge the treated gas from the system.

2. The odor gas treatment system according to claim 1, characterized in that, The circulating water tank is equipped with an oxygen content sensor.

3. The odor gas treatment system according to claim 1, characterized in that, The exhaust device includes an induced draft fan and an exhaust stack. The inlet of the induced draft fan is connected to the air outlet provided at the top of the spray tower, and the outlet of the induced draft fan is connected to the inlet of the exhaust stack.

4. The odor gas treatment system according to claim 1, characterized in that, The spray tower is filled with at least three layers of packing material.

5. The odor gas treatment system according to claim 4, characterized in that, The filler in the packing layer is at least one of Pall rings, Raschig rings, or multifaceted hollow spheres.

6. A method for treating odorous gases based on spray-coupled micro / nano hydroxyl groups, characterized in that, The method treats odorous gases based on the odorous gas treatment system described in claims 1-5, and includes the following steps: S100: Use an odorous gas collection device to pump the odorous gas from the odor source to the bottom of the first-stage spray tower; S200: Ozone or pure oxygen generated by an ozone generator or pure oxygen supply device is introduced into a micro-nano bubble generator to generate a micro-nano bubble solution. S300: The micro-nano bubble solution is sent to the spraying device at the top of the spray tower through the circulating water tank and sprayed downwards, so that the micro-nano bubble solution comes into contact with the odorous gas flowing upwards in the countercurrent in the packing layer of the spray tower and reacts, thereby using the hydroxyl free radicals generated by the collapse of micro-nano bubbles to oxidize and decompose the odorous substances. S400: The system uses an exhaust device to discharge the gas purified by the multi-stage spray tower.

7. The method for treating malodorous gases according to claim 6, characterized in that, It also includes step S300', which involves returning the micro-nano bubble solution discharged from the bottom of the spray tower to the spraying device at the top of the corresponding spray tower through a circulating water tank, thereby realizing the recycling of the micro-nano bubble solution.

8. The method for treating malodorous gases according to claim 7, characterized in that, The diameter of the bubbles in the micro-nano bubble solution is in the range of 1-200 nanometers.

9. The method for treating malodorous gases according to claim 8, characterized in that, In step S300', the oxygen content of the micro-nano bubble solution in the circulating water tank is monitored using an oxygen content sensor, and the start and stop of the nano bubble generator are controlled according to the oxygen content of the micro-nano bubble solution, thereby maintaining the ability of the system to generate hydroxyl radicals.

Images