Multi-process treatment device and process for peculiar smell gas
Through multi-process treatment equipment and biofilm technology, the problem of existing equipment being difficult to remove stubborn odor molecules has been solved, achieving efficient and environmentally friendly odor gas treatment with a removal rate of over 98%, reducing costs.
Patent Information
- Application Number
- CN202510989233.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-10-10
AI Technical Summary
Existing devices are difficult to effectively remove stubborn odor molecules that are insoluble in water, causing environmental pollution and health hazards, and have low treatment efficiency.
A multi-process treatment device is used, including a spray tower, biological treatment and circulating biofilm device. Microorganisms are used to form a biofilm on the filter bed carrier, and odor molecules are degraded by microorganisms. It is combined with multi-layer filter beds and demisting devices to achieve multi-stage coordinated treatment.
It effectively removes odor molecules from odorous gases with a removal rate exceeding 98%, saving energy, reducing manufacturing and maintenance costs, and ensuring that exhaust gases meet environmental standards.
Smart Images
Figure CN120754684A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of waste gas treatment, and in particular to a multi-process treatment device and process for odorous gases. Background Art
[0002] The extruder is the core equipment for feed processing. During operation, the high-temperature treatment process will cause complex reactions such as protein denaturation, carbohydrate degradation, and fat oxidation in the internal materials, inevitably generating compounds with pungent odors, such as ammonia, methylamine, hydrogen sulfide, mercaptans, aldehydes, ketones, short-chain fatty acids and other odorous gases. If these odorous gases are directly discharged without treatment, it will lead to environmental pollution and energy waste, and further cause harm to human health.
[0003] Currently, related technologies typically connect a spray tower device to the exhaust gas outlet of the extruder to remove odor molecules generated by the extruder. However, a single spray tower device can only remove some water-soluble solid substances in the odorous gas or some solid substances carried by the odorous gas. It is difficult to effectively remove stubborn odor molecules that are insoluble in water.
[0004] Therefore, a device and process for treating odorous gas are needed to solve the above technical problems. Summary of the Invention
[0005] In order to solve the technical problem that existing devices have poor treatment effect on odorous gases, the present application provides a multi-process treatment device and process for odorous gases.
[0006] A multi-process treatment device for odorous gas, comprising a spray tower device, a biological treatment device and a circulating biofilm device, wherein the biological treatment device comprises a gas inlet, a gas outlet and a wastewater outlet; The spray tower device includes a connecting component, the spray tower device is connected to the gas inlet of the biological treatment device through the connecting component, and the spray tower device is used to spray and filter the odorous gas to obtain pretreated gas; The biological treatment device includes a filter bed carrier and a spray system, wherein the spray system is arranged above the filter bed carrier and is used to form a microbial biofilm on the filter bed carrier; The circulating biofilm growing device includes a circulating water tank, a pumping component, a reflux component and an impurity removal device. The circulating water tank is used to contain bacterial liquid, which includes bacterial agent, nutrient agent and water, and the circulating water tank is connected to the spraying system through the pumping component; the impurity removal device is connected to the wastewater outlet of the biological treatment device through the reflux component, and the wastewater of the biological treatment device enters the circulating water tank after being treated by the impurity removal device.
[0007] The present application adds a biological treatment device and a circulating biofilm device to the back of the spray tower device for circulating biofilm treatment on the filter bed carrier in the biological treatment device. The circulating biofilm device includes a circulating water tank, a pumping component, a reflux component and an impurity removal device. Before treating the odorous gas generated by the extruder, a bacterial liquid is first prepared in the circulating water tank, and then the bacterial liquid is transported to the spray system in the biological treatment device through the pumping component and sprayed on the filter bed carrier, so that the microorganisms in the bacterial liquid adhere to the filter bed carrier. Through the growth and reproduction of the microorganisms on the filter bed carrier, a biofilm is formed on the filter bed. The microorganisms in the biofilm can utilize and degrade the odor molecules in the odorous gas, thereby effectively removing the water-insoluble odor molecules generated by the extruder. At the same time, it can also assist in removing the residual water-soluble odor molecules in the odorous gas.
[0008] Therefore, the odorous gas processing device of the present application can effectively remove the odorous molecules in the odorous gas generated by the extruder, so that the gas emission meets the environmental protection requirements.
[0009] On the other hand, during the biofilm formation process, the wastewater generated by the biological treatment device flows into the impurity removal equipment through the wastewater outlet, and enters the circulating water tank after being treated by the impurity removal equipment. The bacterial liquid in the circulating water tank is then transported to the spray system through the pumping component to form a closed-loop circulation system. This device realizes multi-process collaborative processing, effectively saves energy, and significantly improves the odor removal efficiency.
[0010] Among them, the bacterial agent includes sulfiding bacteria, nitrifying bacteria and aerobic heterotrophic bacteria; the mass concentration of sulfiding bacteria in the bacterial liquid is 0.5-2g / L, the mass concentration of nitrifying bacteria in the bacterial liquid is 0.5-2g / L, and the mass concentration of aerobic heterotrophic bacteria in the bacterial liquid is 3-5g / L, which can effectively remove hydrogen sulfide, methylamine, aldehydes, ketones and other substances in odorous gas at the same time.
[0011] The nutrient agent comprises a carbon source, a nitrogen source, a phosphorus source and sodium bicarbonate; wherein the mass concentration of the carbon source is 0.5-2 g / L, the mass concentration of the nitrogen source is 0.2-0.8 g / L, the mass concentration of the phosphorus source is 0.05-0.2 g / L, and the mass concentration of the sodium bicarbonate is 0.01-0.05 g / L, which effectively provides nutrients for the growth of the bacterial community on the filter bed carrier and effectively improves the treatment effect of odorous gas.
[0012] Furthermore, the biological treatment device also includes an air guide structure, the spray tower device is connected to the air guide structure through a connecting component, the filter bed carrier is provided with at least two layers, the filter bed carriers are separated by partitions, and the upper and lower sides of the filter bed carrier are provided with air inlet channels and air outlet channels, the air inlet channel is connected to the gas inlet, and the air guide structure allows the pretreated gas to flow to the multiple layers of the filter bed carriers through the gas inlet.
[0013] In the present application, the filter bed carrier is provided with multiple layers and multiple air inlets. The air guide structure can make the pretreated gas flow evenly to the gas inlet of each layer, so that the pretreated gas can pass through the gas inlet respectively, be processed by the corresponding filter bed carrier, and be discharged through the gas outlet, further expanding the movement range of the gas in the biological treatment device and improving the treatment efficiency of the pretreated gas in the biological treatment device.
[0014] Furthermore, a plurality of the gas outlet channels share one gas outlet, and a demisting device is provided in the gas outlet.
[0015] In this application, multiple gas outlet channels share a common gas outlet to simplify the equipment structure and reduce manufacturing and maintenance costs; and a demisting device is provided in the gas outlet to effectively intercept bioaerosols and moisture entrained in the gas, prevent microbial escape from causing secondary pollution, and ensure that the exhaust gas meets environmental protection standards.
[0016] Furthermore, the filter bed carrier is obtained by uniformly mixing 30wt%-50wt% of oak blocks and 50wt%-70wt% of ceramics and then pressing them together. The porosity of the filter bed carrier is controlled to be 40%-50%.
[0017] In the present application, the components of the filter bed carrier are oak blocks and ceramics. On the one hand, the oak blocks can effectively provide carbon sources and other nutrients for the growth of the bacterial community and promote the formation of biofilms. On the other hand, the ceramics can further enhance the stability of the filter bed carrier and reduce the corrosion or falling of the filter bed carrier. 30wt%-50wt% oak blocks and 50wt%-70wt% ceramics are evenly mixed and pressed together, and the porosity of the filter bed carrier is controlled to 40%-50%, ensuring that the pretreated gas can pass through the filter bed carrier smoothly, degrading the impurities in the gas, and providing sufficient microbial attachment sites to improve the gas treatment effect.
[0018] Furthermore, the preparation method of the oak block includes: mechanically crushing the oak block, screening the crushed oak block, selecting wood blocks with a particle size of 5-8 cm and a thickness of 1.5-3 cm, placing them in a high-pressure steam environment with a pressure of 1.0-2.5 MPa and a temperature of 120-130°C for 8-12 minutes to increase the porosity to 60-75%.
[0019] Through the above technical solution, high-pressure steam treatment causes the oak blocks to expand and increase the porosity to 60%-75%, further increasing the amount of microbial attachment, thereby increasing the overall porosity of the filter bed carrier and improving the gas treatment effect.
[0020] Furthermore, the ceramic comprises aminosilane coupling agent modified ceramic and chitosan modified ceramic, and the mass ratio of the aminosilane coupling agent modified ceramic to the chitosan modified ceramic is (30-40): (60-70).
[0021] Through the above technical solution, the aminosilane coupling agent is grafted onto the ceramic surface, forming a hydrophilic amino layer (-NH2). This further promotes the spread of bacterial liquid, accelerates biofilm formation, and enables the bacterial community to better adhere to the filter bed carrier. The chitosan-modified ceramic surface has a positive charge, which is conducive to the adsorption of negatively charged bacteria. Its inherent strong adhesion further promotes the stable attachment of bacteria in the bacterial liquid. Therefore, a combination of aminosilane coupling agent-modified ceramic and chitosan-modified ceramic in a mass ratio of (30-40): (60-70) can promote the stable attachment of bacterial species, thereby improving biofilm formation efficiency.
[0022] Furthermore, the raw materials for preparing the aminosilane coupling agent modified ceramic include an aminosilane coupling agent and ceramic, and the weight ratio of the aminosilane coupling agent to the ceramic is (0.03-0.05):10.
[0023] Through the above technical solution, the aminosilane coupling agent is grafted onto the ceramic surface to form a hydrophilic amino layer on the ceramic surface, which further improves the bacterial liquid attachment efficiency, shortens the biofilm formation time, and improves the biofilm formation efficiency and the treatment effect of the filter bed carrier.
[0024] Furthermore, the chitosan-modified ceramic is first surface-modified by an isocyanate silane coupling agent to obtain isocyanate silane coupling agent-modified ceramic, and then obtained by reacting chitosan dry powder with the isocyanate silane coupling agent-modified ceramic; wherein the weight ratio of the isocyanate silane coupling agent to the ceramic is (0.04-0.05):10, and the weight ratio of the chitosan dry powder to the isocyanate silane coupling agent-modified ceramic is (1-2):10.
[0025] Through the above technical solution, the isocyanate silane coupling agent is used to improve the ceramic surface and then reacts with the chitosan dry powder. The isocyanate group is covalently bonded to the chitosan amino group, which is beneficial to improving the grafting effect of chitosan and improving the attachment stability of the bacteria.
[0026] Furthermore, the preparation method of aminosilane coupling agent modified ceramics is as follows: Acetic acid is added dropwise to a 90% ethanol aqueous solution to adjust the pH to 4, an aminosilane coupling agent is added to the ethanol aqueous solution to obtain a modified solution, ceramics are placed in the modified solution, the temperature is raised to 60°C-80°C for reaction, after 2 hours, the ceramics are filtered out, washed three times with anhydrous ethanol and distilled water in sequence, and dried in an oven at 80°C-100°C to obtain aminosilane coupling agent modified ceramics.
[0027] Further, the preparation method of the chitosan modified ceramic is as follows: The isocyanate silane coupling agent is dissolved in acetone, then the ceramic is added, uniformly dispersed, heated to 55-65 DEG C for two hours, after the reaction, the isocyanate silane coupling agent modified ceramic is obtained by filtering, washing and drying; the chitosan is added to the acetic acid solution with a mass concentration of 1-3.5%, the chitosan is cast into a film after being dissolved in the acetic acid solution, further dried at 60-80 DEG C in a vacuum environment, and then crushed to obtain chitosan dry powder; the chitosan dry powder and the isocyanate silane coupling agent modified ceramic are uniformly mixed, heated to 80-100 DEG C in a vacuum environment for reaction, and the chitosan modified ceramic is obtained.
[0028] The application also provides a multi-flow process for treating odor gas, which uses the odor gas multi-flow treatment device described above, and includes the following steps: Step one: add bacteria liquid into the circulating water tank, and use the pumping assembly to deliver the bacteria liquid to the spray system and spray it on the filter bed carrier for biofilm formation; during the biofilm formation process, the wastewater generated by the biological treatment device flows into the impurity removal equipment through the wastewater outlet, and then enters the circulating water tank after being treated by the impurity removal equipment; Step two: after the biofilm formation is completed, the odor gas is introduced into the spray tower device, and the pretreated gas is obtained through the spray treatment and filtration treatment of the spray tower device; Step three: the pretreated gas is delivered to the gas inlet of the biological treatment device through the communication assembly, and the microorganisms on the filter bed carrier in the biological treatment device are used to degrade the pretreated gas, and the degraded gas is discharged through the gas outlet.
[0029] Through the above technical solution, the process uses the spray tower pretreatment and the biological treatment device to treat the odor gas, and the two-stage cooperation makes the comprehensive removal rate exceed 98%.
[0030] Further, when the removal efficiency of the biological treatment device for odor is less than 90%, the bacteria liquid is supplemented to the filter bed carrier through the spray system, and the circulating water tank is emptied every 15-30 days, and then new bacteria liquid is injected to ensure the treatment effect of the biological treatment device.
[0031] Through the above technical solution, the dynamic bacteria liquid supplement ensures the adhesion of the bacteria group on the filter bed carrier, and the removal rate of the biological treatment device is always greater than 90%, and the timed emptying of the circulating water tank can remove the metabolic products to prevent them from inhibiting the activity of the biological biofilm formation, thereby maintaining long-term treatment stability and effectively improving the treatment effect of the gas.
[0032] In summary, the present application at least includes the following beneficial technical effects: (1) The treatment device of the present application is equipped with a biological treatment device and a circulating biofilm device behind the spray tower device for circulating biofilm treatment on the filter bed carrier in the biological treatment device. Before treating the odorous gas generated by the extruder, the bacterial liquid is transported to the spray system in the biological treatment device by a pumping component and sprayed on the filter bed carrier, so that the microorganisms in the bacterial liquid adhere to the filter bed carrier. Through the growth and reproduction of the microorganisms on the filter bed carrier, a biofilm is formed on the filter bed. The microorganisms in the biofilm can utilize and degrade the odor molecules in the odorous gas, thereby effectively removing the odorous molecules that are difficult to dissolve in water generated by the extruder. At the same time, it can also assist in removing the water-soluble odorous molecules remaining in the odorous gas. The two-stage synergy makes the comprehensive removal rate exceed 98%.
[0033] (2) The filter bed carrier is composed of oak blocks and ceramics. On the one hand, the oak blocks can effectively provide carbon sources and other nutrients for the growth of the bacterial community and promote the formation of biofilms. On the other hand, the ceramics can further enhance the stability of the filter bed carrier and reduce the corrosion or falling of the filter bed carrier. Furthermore, the ceramics include aminosilane coupling agent modified ceramics and chitosan modified ceramics, which can effectively promote the stable attachment of bacteria, thereby improving the biofilm formation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 The present invention provides a multi-process treatment device for odorous gas. Figure 2 This is a cross-sectional view of the internal structure of a biological treatment device for odorous gas provided in an embodiment of the present invention.
[0035] Description of reference numerals: 1. Spray tower device; 11. Air inlet valve port; 12. Connecting component; 2. Biological treatment device; 21. Gas inlet; 22. Gas outlet; 23. Wastewater outlet; 24. Filter bed carrier; 25. Spray system; 26. Air guide structure; 27. Partition; 28. Demisting device; 3. Circulating film forming device; 31. Circulating water tank; 32. Pumping component; 33. Reflux component; 34. Decontamination equipment. DETAILED DESCRIPTION
[0036] The present application is further described below in conjunction with specific experiments.
[0037] [Preparation Example 1] A filter bed carrier is obtained by uniformly pressing 30 kg of oak blocks and 70 kg of ceramics, and the porosity of the filter bed carrier is 50%.
[0038] Among them, the preparation method of oak blocks is as follows: the oak block raw material is mechanically crushed, sieved after crushing, and wood blocks with a particle size of 5-8 cm and a thickness of 1.5-3 cm are selected, and placed in a high-pressure steam environment with a pressure of 2.5 MPa and a temperature of 120°C for 12 minutes to obtain oak blocks.
[0039] [Preparation Example 2] A filter bed carrier, which differs from Preparation Example 1 in that the mass ratio of oak blocks to ceramics is different. In this Preparation Example, the filter bed carrier is obtained by uniformly pressing 50 kg of oak blocks and 50 kg of ceramics, and the porosity of the filter bed carrier is 40%.
[0040] Among them, the preparation method of oak blocks is as follows: the oak block raw material is mechanically crushed, sieved after crushing, and wood blocks with a particle size of 5-8 cm and a thickness of 1.5-3 cm are selected, and placed in a high-pressure steam environment with a pressure of 1 MPa and a temperature of 130°C for 8 minutes to obtain oak blocks.
[0041] [Preparation Example 3] A filter bed carrier is obtained by uniformly pressing oak blocks and ceramics. Different from Preparation Example 1, the ceramics are modified with an aminosilane coupling agent, and the porosity of the filter bed carrier is 50%.
[0042] The preparation method of aminosilane coupling agent modified ceramics is as follows: acetic acid is added dropwise to 100 kg of 90% ethanol aqueous solution to adjust the pH to 4, 0.35 kg of aminosilane coupling agent is added to the ethanol aqueous solution to obtain a modified solution, 70 kg of ceramics are placed in the modified solution, the solution is heated to 60° C. for reaction, the solution is filtered out after 2 hours, and the solution is washed three times with anhydrous ethanol and distilled water, followed by drying in an oven at 100° C. to obtain aminosilane coupling agent modified ceramics.
[0043] The aminosilane coupling agent specifically uses γ-aminopropyltriethoxysilane.
[0044] [Preparation Example 4] A filter bed carrier is obtained by uniformly pressing oak blocks and ceramics. Different from Preparation Example 1, the ceramics are chitosan-modified ceramics, and the porosity of the filter bed carrier is 50%.
[0045] The preparation method of chitosan-modified ceramics comprises the following steps: dissolving 0.35 kg of an isocyanate silane coupling agent in 100 kg of acetone, then adding 70 kg of ceramics, uniformly dispersing the mixture, heating the mixture to 60° C. for reaction for two hours, filtering, washing, and drying the mixture after the reaction is completed to obtain isocyanate silane coupling agent-modified ceramics; adding chitosan (chitosan 9012-76-4, Xi'an Jinxiang Pharmaceutical Excipients Co., Ltd.) to an acetic acid solution with a mass concentration of 2%, dissolving the chitosan in the acetic acid solution, and casting the chitosan into a film, which is then dried at 60° C. in a vacuum environment and then crushed to obtain chitosan dry powder; uniformly mixing 7 kg of chitosan dry powder and 70 kg of isocyanate silane coupling agent-modified ceramics, heating the mixture to 100° C. in a vacuum environment for reaction, and obtaining chitosan-modified ceramics.
[0046] The isocyanate silane coupling agent specifically uses 1,3,5-tris(trimethoxysilylpropyl)isocyanurate.
[0047] Preparation Example 5 A filter bed carrier is obtained by uniformly pressing oak blocks and ceramics. Unlike Preparation Example 1, the ceramics include the aminosilane coupling agent-modified ceramics in Preparation Example 3 and the chitosan-modified ceramics in Preparation Example 4. In this preparation example, the filter bed carrier consists of 30 kg of oak blocks, 28 kg of aminosilane coupling agent-modified ceramics and 42 kg of chitosan-modified ceramics.
[0048] Preparation Example 6 A filter bed carrier is obtained by uniformly pressing oak blocks and ceramics. Different from Preparation Example 5, the chitosan-modified ceramics are not surface-modified by an isocyanate-silane coupling agent.
[0049] That is, in this preparation example, the preparation method of chitosan modified ceramics is as follows: Chitosan was added to an acetic acid solution with a mass concentration of 2%. The chitosan was dissolved in the acetic acid solution and then cast into a film. The film was further dried under a vacuum environment at 60°C and then crushed to obtain chitosan dry powder. 7 kg of chitosan dry powder and 70 kg of ceramic were evenly mixed and heated to 100°C under a vacuum environment for reaction to obtain chitosan-modified ceramic. Example
[0050] The present application discloses a multi-process treatment device for odorous gas, referring to Figure 1-2 , including a spray tower device 1, a biological treatment device 2 and a circulating biofilm device 3, the biological treatment device 2 includes a gas inlet 21, a gas outlet 22 and a wastewater outlet 23; The spray tower device 1 includes a connecting component 12, and the spray tower device 1 is connected to the gas inlet 21 of the biological treatment device 2 through the connecting component 12. The spray tower device 1 is used to spray and filter the odorous gas to obtain pre-treated gas; The biological treatment device 2 further includes a filter bed carrier 24 and a spray system 25. The spray system 25 is disposed above the filter bed carrier 24 and is used to form a microbial biofilm on the filter bed carrier 24. The filter bed carrier 24 is any one of the filter bed carriers in [Preparation Example 1] to [Preparation Example 7]. The circulating biofilm forming device 3 includes a circulating water tank 31, a pumping component 32, a reflux component 33 and an impurity removal device 34. The circulating water tank 31 is used to contain the bacterial agent, which includes bacterial liquid, nutrients and water. The circulating water tank 31 is connected to the spraying system 25 through the pumping component 32; the impurity removal device 34 is connected to the wastewater outlet 23 of the biological treatment device 2 through the reflux component 33. The wastewater of the biological treatment device 2 enters the circulating water tank 31 after being treated by the impurity removal device 34.
[0051] In order to improve the treatment efficiency of odorous gases, in this embodiment, the biological treatment device 2 also includes an air guide structure 26, the spray tower device 1 is connected to the air guide structure 26 through the connecting component 12, and the filter bed carrier 24 is provided with multiple layers. In this embodiment, the filter bed carrier 24 is provided with two layers, and the filter bed carriers 24 and the filter bed carriers 24 are separated by a partition 27. The upper and lower sides of the filter bed carrier 24 are provided with air inlet channels and air outlet channels. The air inlet channel is connected to the gas inlet, and multiple air outlet channels share a gas outlet 22. A demisting device 28 is provided in the gas outlet. The air guide structure 26 allows the pretreated gas to flow to the multi-layer filter bed carrier 24 through the gas inlet 21.
[0052] Among them, the bacterial agent includes sulfiding bacteria, nitrifying bacteria and aerobic heterotrophic bacteria; the mass concentration of sulfiding bacteria in the bacterial liquid is 0.5-2g / L, the mass concentration of nitrifying bacteria in the bacterial liquid is 0.5-2g / L, and the mass concentration of aerobic heterotrophic bacteria in the bacterial liquid is 3-5g / L, which can effectively remove hydrogen sulfide, methylamine, aldehydes, ketones and other substances in odorous gas at the same time.
[0053] The nutrient agent comprises a carbon source, a nitrogen source, a phosphorus source and sodium bicarbonate; wherein the mass concentration of the carbon source is 0.5-2 g / L, the mass concentration of the nitrogen source is 0.2-0.8 g / L, the mass concentration of the phosphorus source is 0.05-0.2 g / L, and the mass concentration of the sodium bicarbonate is 0.01-0.05 g / L, which effectively provides nutrients for the growth of the bacterial community on the filter bed carrier and effectively improves the treatment effect of odorous gas.
[0054] This embodiment also discloses a multi-process treatment process for odorous gas using the multi-process treatment device for odorous gas, which process includes the following steps: Step 1: Add bacterial liquid to the circulating water tank 31, transport the bacterial liquid to the spray system 25 through the pumping assembly 32, and spray it on the filter bed carrier 24 to form biofilm. During the biofilm formation process, the wastewater generated by the biological treatment device 2 flows into the impurity removal equipment 34 through the wastewater outlet 23, and then enters the circulating water tank 31 after being treated by the impurity removal equipment 34. Step 2: After the biofilm is formed, the odorous gas is passed into the spray tower device 1, and the pre-treated gas is obtained through the spraying treatment and filtration treatment of the spray tower device 1; Step 3: The pretreated gas is transported to the gas inlet 21 of the biological treatment device 2 through the connecting component 12 , and the pretreated gas is degraded by the microorganisms on the filter bed carrier 24 in the biological treatment device 2 , and the degraded gas is discharged through the gas outlet 22 .
[0055] Preferably, when the odor removal efficiency of the biological treatment device 2 is lower than 90%, the filter bed carrier 24 is replenished with bacterial liquid through the spray system 25, and the circulating water tank 31 is emptied every 15-30 days and re-injected with new bacterial liquid after emptying to ensure the treatment effect of the biological treatment device 2.
[0056] The following is a specific experimental test of the removal efficiency of odor molecules by different filter bed carriers under the same biofilm formation time: wherein, before treating the odorous gas, the filter bed carrier is sprayed with a spray system to form a biofilm, and the biofilm formation time is selected for 3 days and 7 days respectively for testing; the mass concentration of sulfiding bacteria (Thiobacillus thiooxidans, Shanghai Preservation Biotechnology Center) in the bacterial solution sprayed by the spray system is 0.5 / L, the mass concentration of nitrifying bacteria (Nitrifying bacteria, Hubei Zhongyan Biotechnology Co., Ltd.) in the bacterial solution is 0.5 / L, the mass concentration of aerobic heterotrophic bacteria (Bacillus subtilis, Jinan Mingrun Chemical Co., Ltd.) in the bacterial solution is 3 / L, and the nutrient solution contains a carbon source, a nitrogen source, a phosphorus source and sodium bicarbonate; wherein the mass concentration of the carbon source (glucose) is 2g / L, the mass concentration of the nitrogen source (ammonium sulfate) is 0.8g / L, the mass concentration of the phosphorus source (potassium dihydrogen phosphate) is 0.05g / L, the mass concentration of sodium bicarbonate is 0.5g / L, and the concentration of hydrogen sulfide in the odorous gas to be treated is 3mg / m 3 , trimethylamine concentration is 8mg / m 3 , formaldehyde 2mg / m 3 The waste gas to be treated is respectively introduced into the biological treatment device with different filter bed carriers.
[0057] Table 1 is a comparison of the removal efficiency of hydrogen sulfide, trimethylamine, and formaldehyde in odorous gas when the biofilm formation time is 3 days; Table 2 is a comparison of the removal efficiency of hydrogen sulfide, trimethylamine, and formaldehyde in odorous gas when the biofilm formation time is 7 days; Table 1 Table 2 Filter bed carrier Hydrogen sulfide removal rate Trimethylamine removal rate Formaldehyde removal rate Preparation Example 1 92.1％ 92.5％ 92.7％ Preparation Example 2 93.3％ 93.6％ 93.9％ Preparation Example 3 99.1％ 99.0％ 99.2％ Preparation Example 4 99.2％ 99.1％ 99.1％ Preparation Example 5 99.8％ 99.6％ 99.9％ Preparation Example 6 99.5％ 99.6％ 99.5％ Combined with the test data in Tables 1-2 above, it can be seen that when the film formation time of Preparation Example 5 is 3 days, the removal rate is as high as 98%, which is significantly better than the removal efficiency of Preparation Examples 1-4 and 6. When the film formation time is 7 days, except for Preparation Examples 1 and 2, the removal rates of hydrogen sulfide, trimethylamine and formaldehyde are all over 99%. When the filter bed carrier of Preparation Example 5 is used, the gas removal effect when the film formation time is 3 days is very similar to that when the film formation time is 7 days. That is to say, when the film formation time of Preparation Example 5 is 3 days, the biofilm formed by the bacterial community on the filter bed carrier has formed a uniform and efficient active layer, which can basically achieve the removal of odorous gases such as hydrogen sulfide, trimethylamine, and formaldehyde in odorous gases. It further illustrates that under the synergistic effect of aminosilane coupling agent modified ceramics and chitosan modified ceramics, the stable attachment and growth of bacteria can be further promoted, thereby improving the film formation effect and improving the removal effect of gases such as hydrogen sulfide, trimethylamine, and formaldehyde in odorous gases.
[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A multi-process treatment device for odorous gas, characterized by: It includes a spray tower device, a biological treatment device and a circulating biofilm device, wherein the biological treatment device includes a gas inlet, a gas outlet and a wastewater outlet; The spray tower device includes a connecting component, the spray tower device is connected to the gas inlet of the biological treatment device through the connecting component, and the spray tower device is used to spray and filter the odorous gas to obtain pretreated gas; The biological treatment device further comprises a filter bed carrier and a spraying system, wherein the spraying system is arranged above the filter bed carrier and is used to form a microbial biofilm on the filter bed carrier; The circulating biofilm growing device includes a circulating water tank, a pumping component, a reflux component and an impurity removal device. The circulating water tank is used to contain bacterial liquid, which includes bacterial agent, nutrient agent and water, and the circulating water tank is connected to the spraying system through the pumping component; the impurity removal device is connected to the wastewater outlet of the biological treatment device through the reflux component, and the wastewater of the biological treatment device enters the circulating water tank after being treated by the impurity removal device.
2. The multi-process treatment device for odorous gas according to claim 1, characterized in that: The biological treatment device also includes an air guide structure, the spray tower device is connected to the air guide structure through a connecting component, the filter bed carrier is provided with at least two layers, the filter bed carriers are separated by partitions, and the upper and lower sides of the filter bed carrier are provided with air inlet channels and air outlet channels, the air inlet channel is connected to the gas inlet, and the air guide structure allows the pretreated gas to flow to the multiple layers of the filter bed carriers through the gas inlet.
3. The multi-process treatment device for odorous gas according to claim 2, characterized in that: A plurality of the gas outlet channels share one gas outlet, and a demisting device is provided in the gas outlet.
4. The multi-process treatment device for odorous gas according to claim 1, characterized in that: The filter bed carrier is obtained by uniformly mixing 30wt%-50wt% of oak blocks and 50wt%-70wt% of ceramics and then pressing them together. The porosity of the filter bed carrier is controlled to be 40%-50%.
5. The multi-process treatment device for odorous gas according to claim 4, characterized in that: The preparation method of the oak block comprises: mechanically crushing the oak block, screening the crushed oak block, selecting wood blocks with a particle size of 5-8 cm and a thickness of 1.5-3 cm, placing the wood blocks in a steam environment with a pressure of 1.0-2.5 MPa and a temperature of 120-130° C. for 8-12 minutes to increase the porosity to 60-75%.
6. The multi-process treatment device for odorous gas according to claim 4, characterized in that: The ceramic comprises aminosilane coupling agent modified ceramic and chitosan modified ceramic, and the mass ratio of the aminosilane coupling agent modified ceramic to the chitosan modified ceramic is (30-40): (60-70).
7. The multi-process treatment device for odorous gas according to claim 6, characterized in that: The raw materials for preparing the aminosilane coupling agent modified ceramic include an aminosilane coupling agent and ceramic, and the weight ratio of the aminosilane coupling agent to the ceramic is (0.03-0.05):
10.
8. The multi-process treatment device for odorous gas according to claim 6 is characterized in that The chitosan-modified ceramic is first surface-modified by an isocyanate-silane coupling agent to obtain the isocyanate-silane coupling agent-modified ceramic, and then the chitosan dry powder is reacted with the isocyanate-silane coupling agent-modified ceramic to obtain the chitosan-modified ceramic. The weight ratio of the isocyanate silane coupling agent to the ceramic is (0.04-0.05):10, and the weight ratio of the chitosan dry powder to the isocyanate silane coupling agent-modified ceramic is (1-2):
10.
9. A multi-process treatment process for odorous gas, characterized in that: The multi-process treatment device for odorous gas according to any one of claims 1 to 8 is used, and the process comprises the following steps: Step 1: Add bacterial liquid to the circulating water tank, transport the bacterial liquid to the spraying system through the pumping component, and spray it on the filter bed carrier to form biofilm. During the biofilm formation process, the wastewater generated by the biological treatment device flows into the impurity removal equipment through the wastewater outlet, and enters the circulating water tank after being treated by the impurity removal equipment. Step 2: After the film is formed, the odorous gas is passed into the spray tower device, and the pre-treated gas is obtained by the spray treatment of the spray tower device; Step 3: The pre-treated gas is transported to the gas inlet of the biological treatment device through the connecting component, and the pre-treated gas is degraded by the microorganisms on the filter bed carrier in the biological treatment device, and the degraded gas is discharged through the gas outlet.
10. The multi-process treatment process for odorous gas according to claim 9, characterized in that: When the odor removal efficiency of the biological treatment device is lower than 90%, the filter bed carrier is supplemented with bacterial liquid through the spray system, and the circulating water tank is emptied every 15-30 days and re-injected with new bacterial liquid after emptying to ensure the treatment effect of the biological treatment device.