Seasoning production waste gas biological treatment method

Abstract

The invention discloses a seasoning production waste gas biological treatment method which comprises a production line exhaust pipe and further comprises a multi-stage exhaust fan, a first-stage spray tower, a second-stage spray tower and a biological filter box, the exhaust end of the production line exhaust pipe is connected with the gas inlet end of the first-stage spray tower through the multi-stage exhaust fan, and an electric air valve is installed in the production line exhaust pipe; according to the seasoning production waste gas biological treatment method, the multiple stages of spray towers are matched with the biological filter box structure, a brand-new filler structure is matched, and the seasoning production waste gas biological treatment method is environmentally friendly, sanitary, free of secondary pollution, high in impact resistance, capable of working normally when the waste gas concentration fluctuates within 3-1500 ppm, short in waste gas treatment time, free of secondary pollution and capable of being recycled. The efficiency is high, the comprehensive efficiency can reach 95% or above, the construction cost is low, the operation cost is low, chemicals do not need to be added, various materials can be adopted, the corrosion resistance is high, the service life is long, the composite filter material is adopted, the surface area is large, the air permeability is good, and hardening is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a biological treatment method for waste gas from seasoning production. Background Art

[0002] Seasoning is a compound seasoning made from a variety of substances that have been finely processed. The appearance of seasoning is mostly fine powder, bright color, and strong smell. It is divided into different types according to different seasoning needs. Common ones include pepper, chicken juice, chicken powder, chicken essence, etc., which are common condiments. During its production and preparation process, waste gas treatment equipment is needed to centrally treat the waste gas generated in each production line to ensure that the waste gas meets the emission standards.

[0003] Traditional waste gas treatment equipment for seasoning production has the following shortcomings during use. Common production waste gas treatment methods include adsorption, condensation recovery and combustion. The adsorption method requires regular replacement of adsorption components such as activated carbon during use, and maintenance is cumbersome. The condensation recovery method requires large investment in treatment equipment, high energy consumption and high operating costs. The combustion method consumes a lot of energy and has high operating costs during the treatment process of waste gas equipment. There is a lack of cost-effective equipment and treatment methods that can ensure the quality of waste gas treatment. For this reason, we propose a biological treatment method for seasoning production waste gas. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a biological treatment method for waste gas from seasoning production. The waste gas to be treated is sucked in by a multi-stage exhaust fan and discharged into the first-level spray tower and the second-level spray tower in turn. The two groups of spray towers spray and wash the waste gas. The washing tower adopts the principles of inertial collision, condensation, centrifugal force, swirl, etc. Under the power of the fan, the flue gas impacts the water tank at high speed to form water mist, and most of the particles sink into the water. Under the action of the diverter, the atomized airflow rises rapidly, and the droplets further collide and condense to form a water-ash mixture. The water-ash mixture removes organic matter through the packing layer A and uses the demisting layer to separate gas and water, thereby achieving the effect of removing organic matter and particulate matter. The waste gas treated by the two groups of spray towers enters the biological Inside the filter box, the exhaust gas entering the biological filter box is first washed by the washing chamber and then treated by the filler layer B. After treatment, it is discharged through the filter chamber. The filler B inside the biological filter box is conducive to the attachment and growth of biological composite fillers and microbial dominant strains. Under suitable environmental conditions, the microorganisms in the filter box form a biofilm on the surface of filler B, using the inorganic and organic matter in the exhaust gas as a carbon source and energy source, and maintaining their life activities by degrading odorous substances. The odorous substances are decomposed into odorless substances such as water, carbon dioxide and minerals to achieve the purpose of purifying odorous gases. The purified exhaust gas is then discharged by the terminal induced draft fan and the exhaust pipe. The biological filter box adopts biotechnology, is environmentally friendly and hygienic, has no secondary pollution, can simultaneously treat exhaust gas containing multiple pollutants, has strong impact resistance, and has a high degree of odor reduction. It can work normally when the gas concentration fluctuates between 3-1500ppm. The waste gas treatment time is short and the efficiency is high. The purification can be completed in 5-10 seconds, and the comprehensive efficiency can reach more than 95%. The biological strains can form biofilms at one time, and there are many types of strains. The inoculation time is short, the construction cost is low, the operating cost is low, and no chemicals need to be added. A variety of materials can be used, and the corrosion resistance is strong and the service life is long. The composite filter material has a large surface area, good air permeability, and is not allowed to be hardened. The filler layer B is made of volcanic rock biofilter material and ceramsite biofilter material. The volcanic rock biofilter material is used as a biofilm carrier, which is harmless and has no inhibitory effect on the fixed microorganisms. It is corrosion-resistant and inert. It does not participate in the biochemical reaction of the biofilm in the environment. The filter surface has a positive charge, which is conducive to the fixation and growth of microorganisms. It has strong hydrophilicity and adhesion. The amount of biofilm is large and the speed is fast. At the same time, the appearance is non-pointed granular, the flow resistance is small, it is not easy to be blocked, the water and air are evenly distributed, the backwashing microbial film is not easy to fall off, and the volcanic rock is also a natural honeycomb porous, which is suitable for the attachment and growth of microorganisms. It is the best growth environment for bacterial flocs. The ceramsite biofilter has a spherical shape, a smooth and hard surface, and a honeycomb shape inside. It has the characteristics of low density, low thermal conductivity and high strength. Ceramsite has a certain mechanical strength and strong water absorption, air permeability and fertilizer holding capacity. Small particles are stacked together to form many holes, which are breathable and water-saving, and will not be compacted. There is no dust in the dry state, and it will not disintegrate after being soaked in water, and no mud will be produced, which is conducive to the biological reproduction of microorganisms. It also has the characteristics of light specific gravity, good surface properties, long service life, and low water consumption for backwashing.The multi-stage spray tower is combined with a biological filter box structure and a new filler structure to reduce the cost of waste gas treatment and daily maintenance while ensuring the quality of waste gas treatment.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A biological treatment method for waste gas from seasoning production includes an exhaust pipe of a production line, and also includes a multi-stage exhaust fan, a primary spray tower, a secondary spray tower and a biological filter box. The exhaust pipe discharge end of the production line is connected to the air inlet end of the primary spray tower through the multi-stage exhaust fan, and an electric air valve is installed inside the exhaust pipe of the production line. The primary spray tower discharge end is connected to the air inlet end of the secondary spray tower, and the secondary spray tower discharge end is connected to the air inlet end of the biological filter box. The biological filter box discharge end is equipped with a terminal induced draft fan, and exhaust pipes are installed between the terminal induced draft fan and the biological filter box and at the discharge end of the terminal induced draft fan.

[0007] Preferably, the first-stage spray tower and the second-stage spray tower are each provided with an exhaust gas inlet on one side of the bottom and an exhaust gas outlet on the top of the first-stage spray tower and the second-stage spray tower, the first-stage spray tower and the second-stage spray tower are each fixedly connected to a water tank on one side of the bottom, the first-stage spray tower and the second-stage spray tower are each overlapped with a support frame inside and a packing layer A is laid on the top of the support frame; the exhaust gas is pre-treated through the cooperation of the first-stage spray tower and the second-stage spray tower.

[0008] Preferably, a circulating liquid tank is provided at the bottom end of the biological filter box, a washing chamber is provided at the side of the biological filter box near the air inlet end, a filtering chamber is provided at the side of the biological filter box near the exhaust end, and a packing layer B is laid between the washing chamber and the filtering chamber in the biological filter box; liquid is stored in the circulating liquid tank structure, the washing chamber is used for washing waste gas, the filtering chamber is used for removing and filtering moisture, and the packing layer B is used for biological treatment of waste gas.

[0009] Preferably, a maintenance door is movably connected to the top of the water tank, pump bodies are installed on the sides of the first-level spray tower and the second-level spray tower, the water suction end of the pump body extends to the bottom end of the first-level spray tower and the second-level spray tower, and the drainage end of the pump body is installed with a water spray pipe extending to the first-level spray tower and the second-level spray tower, and a flow meter is installed inside the water spray pipe near the pump body; the pump body is running to circulate the liquid, and the flow meter is convenient for observing the usage of the liquid.

[0010] Preferably, a demisting layer is built into the top of the first-stage spray tower and the second-stage spray tower, and maintenance windows are provided on the sides of the first-stage spray tower and the second-stage spray tower; water vapor is separated by the demisting layer, and the interior of the spray tower can be easily inspected and maintained through the maintenance window.

[0011] Preferably, the filler layer B is made of volcanic rock biofilter material and ceramsite biofilter material; a new composite filter material structure is adopted to improve the filtering effect.

[0012] Preferably, the top of the biological filter box is provided with an inspection hole for convenient inspection of the interior of the biological filter box; the inspection hole structure facilitates inspection and maintenance of the interior of the biological filter box.

[0013] Preferably, the biological treatment method for seasoning production waste gas comprises the following steps:

[0014] S1. The exhaust pipes of the production lines are respectively connected to the waste gas exhaust systems of each production workshop within the factory. The production lines that need to be treated within the factory include the pepper powder production line, chicken sauce production line, chicken powder production line and chicken essence production line. The waste gas discharge ends of the pepper powder production line, chicken sauce production line and chicken powder production line are connected to the first-level exhaust fan, and the waste gas discharge end of the chicken essence production line is connected to the second-level exhaust fan. The first-level exhaust fan and the second-level exhaust fan cooperate to form a multi-stage exhaust fan system.

[0015] S2. The power of the first-level exhaust fan is 18.5KW, and the power of the second-level exhaust fan is 37KW. According to the air volume calculation of each production line, it can be decided according to the actual production situation to decide which level of exhaust fan to open in order to achieve better processing effects and effectively save energy and reduce consumption. When only production lines other than chicken essence are opened, deodorization can be carried out by turning on the first-level exhaust fan. When only chicken essence production is opened, the second-level exhaust fan needs to be turned on for deodorization. When all four production lines are opened, both the first-level and second-level exhaust fans need to be turned on.

[0016] S3. The waste gas to be treated drawn in by the multi-stage exhaust fan is discharged into the first-level spray tower and the second-level spray tower in turn. The two groups of spray towers spray and wash the waste gas. The washing tower adopts the principles of inertial collision, condensation, centrifugal force, swirl, etc. Under the power of the fan, the flue gas impacts the water tank at high speed to form water mist. Most of the particles sink into the water. Under the action of the diverter, the atomized airflow rises rapidly, and the droplets further collide and condense to form a water-ash mixture. The water-ash mixture removes organic matter through the packing layer A and uses the demisting layer to separate gas and water, thereby achieving the effect of removing organic matter and particulate matter.

[0017] S4. The waste gas treated by two groups of spray towers enters the biological filter box. The waste gas entering the biological filter box is first washed by the washing chamber and then treated by the filler layer B. After treatment, it is discharged through the filter chamber. The filler B inside the biological filter box is conducive to the attachment and growth of biological composite fillers and dominant microbial strains. Under suitable environmental conditions, the microorganisms in the filter box form a biofilm on the surface of the filler B, using the inorganic and organic matter in the waste gas as a carbon source and energy source, maintaining its life activities by degrading odorous substances, and decomposing odorous substances into odorless substances such as water, carbon dioxide and minerals, so as to achieve the purpose of purifying odorous gases. The purified waste gas is then discharged by the terminal induced draft fan and the exhaust pipe.

[0018] The beneficial effects of the present invention are as follows:

[0019] The waste gas to be treated drawn in by the multi-stage exhaust fan is discharged into the first-level spray tower and the second-level spray tower in turn. The two groups of spray towers spray and wash the waste gas. The washing tower adopts the principles of inertial collision, condensation, centrifugal force, swirl, etc. Under the power of the fan, the flue gas impacts the water tank at high speed to form water mist. Most of the particles sink into the water. Under the action of the diverter, the atomized airflow rises rapidly, and the droplets further collide and condense to form a water-ash mixture. The water-ash mixture removes organic matter through the packing layer A and uses the demisting layer to separate gas and water, thereby achieving the effect of removing organic matter and particulate matter. The waste gas treated by the two groups of spray towers enters the biological filter box. The waste gas entering the biological filter box is first washed by the washing chamber and then treated by the packing layer B. After treatment, it is discharged through the filter cavity. The filler B inside the biological filter box is a composite filler and a dominant microbial strain that is conducive to biological attachment and growth. Under suitable environmental conditions, the microorganisms in the filter box form a biofilm on the surface of the filler B, and use the inorganic and organic matter in the exhaust gas as a carbon source and energy source. By degrading the odorous substances, they maintain their life activities and decompose the odorous substances into odorless substances such as water, carbon dioxide and minerals, so as to achieve the purpose of purifying the odorous gas. The purified exhaust gas is then discharged by the terminal induced draft fan and the exhaust pipe. The biological filter box adopts biotechnology, is environmentally friendly and hygienic, has no secondary pollution, can simultaneously treat exhaust gas containing multiple pollutants, has strong impact resistance, can work normally when the exhaust gas concentration fluctuates between 3-1500ppm, has a short exhaust gas treatment time and high efficiency, and can effectively treat the exhaust gas containing multiple pollutants. -10 seconds to complete purification, the comprehensive efficiency can reach more than 95%, biological bacteria can form biofilms at one time, there are many types of bacteria, short inoculation time, low construction cost, low operating cost, no need to add chemicals, can be made of a variety of materials, strong corrosion resistance, long service life, composite filter material with large surface area, good air permeability, no hardening, long service life, filler layer B material is volcanic rock biofilter material and ceramsite biofilter material, volcanic rock biofilter material as a biofilm carrier, harmless to the fixed microorganisms, no inhibitory effect, corrosion resistance, inert, does not participate in the biochemical reaction of the biofilm in the environment, the filter surface has a positive charge, which is conducive to the fixation and growth of microorganisms, strong hydrophilicity, large amount of attached biofilm and fast speed, at the same time, the appearance is non-pointed granular, small flow resistance, no Easy to clog, even distribution of water and air, backwashing microbial film is not easy to fall off, volcanic rock is also a natural honeycomb porous, suitable for microbial attachment and growth, is the best growth environment for bacterial flocs, ceramsite biological filter material has a spherical shape, smooth and hard surface, honeycomb inside, low density, low thermal conductivity, high strength, ceramsite has a certain mechanical strength, water absorption, air permeability, fertilizer holding capacity, small particles stacked together to form many holes, air permeability and water, will not be hardened, no dust in the dry state, will not disintegrate after soaking in water, no mud, is conducive to the biological reproduction of microorganisms, but also has the characteristics of light specific gravity, good surface properties, long service life, low backwashing water consumption, etc., using a multi-stage spray tower with a biological filter box structure, and with a new filler structure,Under the premise of ensuring the quality of waste gas treatment, reduce the cost of waste gas treatment and daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the overall structure of a biological treatment method for waste gas from seasoning production according to the present invention.

[0021] Figure 2 The present invention is a schematic diagram of the internal structure of a spray tower for biological treatment of waste gas from seasoning production.

[0022] Figure 3 The present invention is a schematic diagram of the internal structure of a biological filter box for biological treatment of waste gas from seasoning production.

[0023] Figure 4 The present invention is a schematic diagram of the waste gas treatment process of a method for biologically treating waste gas from seasoning production.

[0024] In the figure: 1. Exhaust pipe of production line; 2. Electric air valve; 3. Multi-stage exhaust fan; 4. Primary spray tower; 5. Secondary spray tower; 6. Biofilter box; 7. Terminal induced draft fan; 8. Exhaust pipe; 9. Waste gas inlet; 10. Waste gas outlet; 11. Water tank; 12. Maintenance door; 13. Pump body; 14. Water spray pipe; 15. Flow meter; 16. Support frame; 17. Packing layer A; 18. Demisting layer; 19. Maintenance window; 20. Circulating liquid tank; 21. Washing chamber; 22. Packing layer B; 23. Filter chamber; 24. Inspection hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] A biological treatment method for waste gas from seasoning production includes a production line exhaust pipe 1, a multi-stage exhaust fan 3, a primary spray tower 4, a secondary spray tower 5 and a biological filter box 6, wherein the exhaust end of the production line exhaust pipe 1 is connected to the air inlet end of the primary spray tower 4 through the multi-stage exhaust fan 3, and an electric air valve 2 is installed inside the exhaust pipe 1 of the production line, the exhaust end of the primary spray tower 4 is connected to the air inlet end of the secondary spray tower 5, the exhaust end of the secondary spray tower 5 is connected to the air inlet end of the biological filter box 6, the exhaust end of the biological filter box 6 is installed with a terminal induced draft fan 7, and an exhaust pipe 8 is installed between the terminal induced draft fan 7 and the biological filter box 6 and at the exhaust end of the terminal induced draft fan 7.

[0027] Preferably, the first-stage spray tower 4 and the second-stage spray tower 5 are each provided with an exhaust gas inlet 9 on one side of the bottom and an exhaust gas outlet 10 on the top of the first-stage spray tower 4 and the second-stage spray tower 5, the first-stage spray tower 4 and the second-stage spray tower 5 are each fixedly connected with a water tank 11 on one side of the bottom, the first-stage spray tower 4 and the second-stage spray tower 5 are each overlapped with a support frame 16 inside and a packing layer A17 is laid on the top of the support frame 16; the exhaust gas is pre-treated by the cooperation of the first-stage spray tower 4 and the second-stage spray tower 5.

[0028] Preferably, a circulating liquid tank 20 is provided at the bottom end of the biological filter box 6, a washing chamber 21 is provided at the side of the biological filter box 6 near the air inlet end, a filter chamber 23 is provided at the side of the biological filter box 6 near the exhaust end, and a packing layer B22 is laid between the washing chamber 21 and the filter chamber 23 inside the biological filter box 6; the liquid agent is stored through the circulating liquid tank 20 structure, the washing chamber 21 is used for exhaust gas washing, the filter chamber 23 is used for water removal and filtration, and the packing layer B22 is used for biological treatment of the exhaust gas.

[0029] Preferably, a maintenance door 12 is movably connected to the top of the water tank 11, and a pump body 13 is installed on the side of the first-level spray tower 4 and the second-level spray tower 5. The water suction end of the pump body 13 extends to the bottom end inside the first-level spray tower 4 and the second-level spray tower 5, and the drainage end of the pump body 13 is installed with a water spray pipe 14 extending to the first-level spray tower 4 and the second-level spray tower 5. A flow meter 15 is installed inside the water spray pipe 14 near the side of the pump body 13; the pump body 13 is operated to circulate the liquid, and the flow meter 15 facilitates the observation of the liquid usage.

[0030] Preferably, a demisting layer 18 is built into the top of the first-stage spray tower 4 and the second-stage spray tower 5, and a maintenance window 19 is provided on the side of the first-stage spray tower 4 and the second-stage spray tower 5; water vapor is separated by the demisting layer 18, and the interior of the spray tower can be easily inspected and maintained through the maintenance window 19.

[0031] Preferably, the filler layer B22 is made of volcanic rock biofilter material and ceramsite biofilter material; a new composite filter material structure is adopted to improve the filtering effect.

[0032] Preferably, the top of the biological filter box 6 is provided with an inspection hole 24 for convenient inspection of the interior of the biological filter box 6; the inspection hole 24 structure facilitates inspection and maintenance of the interior of the biological filter box 6.

[0033] Preferably, the biological treatment method for seasoning production waste gas comprises the following steps:

[0034] S1 and the exhaust pipe 1 of the production line are respectively connected to the waste gas exhaust systems of various production workshops within the factory. The production lines that need to be treated within the factory include a pepper production line, a chicken sauce production line, a chicken powder production line and a chicken essence production line. The waste gas exhaust ends of the pepper production line, the chicken sauce production line and the chicken essence production line are connected to a primary exhaust fan, and the waste gas exhaust end of the chicken essence production line is connected to a secondary exhaust fan. The primary exhaust fan and the secondary exhaust fan cooperate to form a multi-stage exhaust fan 3 system.

[0035] S2. The power of the first-level exhaust fan is 18.5KW, and the power of the second-level exhaust fan is 37KW. According to the air volume calculation of each production line, it can be decided according to the actual production situation to decide which level of exhaust fan to open in order to achieve better processing effects and effectively save energy and reduce consumption. When only production lines other than chicken essence are opened, deodorization can be carried out by turning on the first-level exhaust fan. When only chicken essence production is opened, the second-level exhaust fan needs to be turned on for deodorization. When all four production lines are opened, both the first-level and second-level exhaust fans need to be turned on.

[0036] S3. The waste gas to be treated drawn in by the multi-stage exhaust fan 3 is discharged into the first-level spray tower 4 and the second-level spray tower 5 in turn. The two groups of spray towers spray and wash the waste gas. The washing tower adopts the principles of inertial collision, condensation, centrifugal force, swirl, etc. Under the power of the fan, the flue gas impacts the water tank at high speed to form water mist, and most of the particles sink into the water. Under the action of the diverter, the atomized airflow rises rapidly, and the droplets further collide and condense to form a water-ash mixture. The water-ash mixture removes organic matter through the packing layer A17 and uses the demisting layer 18 for gas-water separation, thereby achieving the effect of removing organic matter and particulate matter.

[0037] S4. The waste gas treated by the two groups of spray towers enters the biological filter box 6. The waste gas entering the biological filter box 6 is first washed by the washing chamber 21 and then treated by the filler layer B22. After treatment, it is discharged through the filter chamber 23. The filler B inside the biological filter box 6 is a composite filler and a dominant microbial strain that is conducive to biological attachment and growth. Under suitable environmental conditions, the microorganisms in the filter box form a biofilm on the surface of the filler B, and use the inorganic and organic matter in the waste gas as a carbon source and energy source. By degrading odorous substances, they maintain their life activities and decompose the odorous substances into odorless substances such as water, carbon dioxide and minerals, thereby achieving the purpose of purifying odorous gases. The purified waste gas is then discharged by the terminal induced draft fan 7 and the exhaust pipe 8.

[0038] In summary, the present invention provides a biological treatment method for waste gas from seasoning production. The waste gas to be treated is sucked in by a multi-stage exhaust fan 3 and discharged into the first-level spray tower 4 and the second-level spray tower 5 in turn. The two groups of spray towers spray and wash the waste gas. The washing tower adopts the principles of inertial collision, condensation, centrifugal force, swirl, etc. Under the power of the fan, the flue gas impacts the water tank at high speed to form water mist, and most of the particles sink into the water. Under the action of the diverter, the atomized airflow rises rapidly, and the droplets further collide and condense to form a water-ash mixture. The water-ash mixture removes organic matter through the packing layer A17 and uses the demisting layer 18 for gas-water separation, thereby achieving the effect of removing organic matter and particulate matter. The waste gas treated by the two groups of spray towers enters the biological filter box 6 The waste gas entering the biological filter box 6 is first washed by the washing chamber 21 and then treated by the packing layer B22. After treatment, it is discharged through the filter chamber 23. The packing B inside the biological filter box 6 is a composite packing and a dominant microbial strain that is conducive to biological attachment and growth. Under suitable environmental conditions, the microorganisms in the filter box form a biofilm on the surface of the packing B, and use the inorganic and organic matter in the waste gas as a carbon source and energy source. By degrading odorous substances to maintain their life activities, the odorous substances are decomposed into odorless substances such as water, carbon dioxide and minerals, so as to achieve the purpose of purifying odorous gases. The purified waste gas is then discharged by the terminal induced draft fan 7 and the exhaust pipe 8. The biological filter box 6 adopts biotechnology, is environmentally friendly and hygienic, has no secondary pollution, and can simultaneously treat waste gas containing multiple pollutants. It has strong impact resistance and can work normally when the exhaust gas concentration fluctuates between 3-1500ppm. The exhaust gas treatment time is short and the efficiency is high. The purification can be completed in 5-10 seconds, and the comprehensive efficiency can reach more than 95%. The biological strains can form biofilms at one time, and there are many types of strains. The inoculation time is short, the construction cost is low, the operating cost is low, and no chemicals need to be added. A variety of materials can be used, and it has strong corrosion resistance and long service life. It uses composite filter materials with large surface area, good air permeability, no hardening, and long service life. The filler layer B22 is made of volcanic rock biofilter materials and ceramsite biofilter materials. Volcanic rock biofilter materials are used as biofilm carriers, which are harmless and have no inhibitory effect on the fixed microorganisms. They are corrosion-resistant and inert. They do not participate in the biochemical reactions of the biofilm in the environment. The filter material surface has a positive charge and has It is conducive to the growth of microorganisms, has strong hydrophilicity, and the amount of attached biofilm is large and fast. At the same time, the appearance is non-pointed granular, the flow resistance is small, it is not easy to be blocked, the water and air are evenly distributed, and the backwashing microbial film is not easy to fall off. Volcanic rock is also a natural honeycomb porous, suitable for the attachment and growth of microorganisms, and is the best growth environment for bacterial flocs. The ceramsite biological filter material has a spherical shape, a smooth and hard surface, and a honeycomb shape inside. It has the characteristics of low density, low thermal conductivity, and high strength. Ceramsite has a certain mechanical strength, and has strong water absorption, air permeability, and fertilizer holding capacity. Small particles are stacked together to form many holes, which are breathable and water-facilitating, will not be compacted, and there is no dust in the dry state. It will not disintegrate after being soaked in water and will not produce mud, which is conducive to the biological reproduction of microorganisms. At the same time, it also has a light specific gravity and good surface properties.It has the characteristics of long service life and low backwash water consumption. It adopts a multi-stage spray tower with a biological filter box 6 structure and a new filler structure to reduce the cost of waste gas treatment and daily maintenance while ensuring the quality of waste gas treatment.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for biological treatment of waste gas from seasoning production, comprising an exhaust pipe (1) of a production line, characterized in that: It also comprises a multi-stage exhaust fan (3), a primary spray tower (4), a secondary spray tower (5) and a biological filter box (6); the exhaust end of the production line exhaust pipe (1) is connected to the air inlet end of the primary spray tower (4) through the multi-stage exhaust fan (3), and an electric air valve (2) is installed inside the exhaust pipe (1) of the production line; the exhaust end of the primary spray tower (4) is connected to the air inlet end of the secondary spray tower (5), and the exhaust end of the secondary spray tower (5) is connected to the air inlet end of the biological filter box (6); the exhaust end of the biological filter box (6) is installed with a terminal induced draft fan (7), and an exhaust pipe (8) is installed between the terminal induced draft fan (7) and the biological filter box (6) and at the exhaust end of the terminal induced draft fan (7).

2. The method for biological treatment of seasoning production waste gas according to claim 1, characterized in that: The first-stage spray tower (4) and the second-stage spray tower (5) are both provided with an exhaust gas inlet (9) on one side of the bottom, and the first-stage spray tower (4) and the second-stage spray tower (5) are both provided with an exhaust gas outlet (10) on the top, the first-stage spray tower (4) and the second-stage spray tower (5) are both fixedly connected with a water tank (11) on one side of the bottom, and the first-stage spray tower (4) and the second-stage spray tower (5) are both overlapped with a support frame (16) inside, and a packing layer A (17) is laid on the top of the support frame (16).

3. The biological treatment method for seasoning production waste gas according to claim 2 is characterized by: A circulating liquid tank (20) is provided at the bottom end of the biological filter box (6), a washing chamber (21) is provided at the side close to the air inlet end of the biological filter box (6), a filtering chamber (23) is provided at the side close to the air outlet end of the biological filter box (6), and a packing layer B (22) is laid between the washing chamber (21) and the filtering chamber (23) of the biological filter box (6).

4. The method for biological treatment of seasoning production waste gas according to claim 3, characterized in that: A maintenance door (12) is movably connected to the top of the water tank (11); a pump body (13) is installed on the side of the primary spray tower (4) and the secondary spray tower (5); a water pumping end of the pump body (13) extends to the bottom of the primary spray tower (4) and the secondary spray tower (5); a water spray pipe (14) extending to the inside of the primary spray tower (4) and the secondary spray tower (5) is installed at the discharge end of the pump body (13); a flow meter (15) is installed inside the water spray pipe (14) close to the pump body (13) on one side.

5. The method for biological treatment of seasoning production waste gas according to claim 4, characterized in that: The top of the first-stage spray tower (4) and the second-stage spray tower (5) are both provided with a demisting layer (18), and the sides of the first-stage spray tower (4) and the second-stage spray tower (5) are both provided with a maintenance window (19).

6. The method for biological treatment of seasoning production waste gas according to claim 5, characterized in that: The material of the filler layer B (22) is volcanic rock biofilter material and ceramsite biofilter material.

7. The method for biological treatment of seasoning production waste gas according to claim 6, characterized in that: The top of the biological filter box (6) is provided with an inspection hole (24) for convenient inspection of the interior of the biological filter box (6).

8. The method for biological treatment of seasoning production waste gas according to claim 7, characterized in that: The biological treatment method for seasoning production waste gas comprises the following steps: S1, the exhaust pipe of the production line (1) is respectively connected to the exhaust gas exhaust system of each production workshop in the factory area. The production lines that need to be treated in the factory area include the pepper powder production line, the chicken juice production line, the chicken powder production line and the chicken essence production line. The exhaust gas exhaust end of the pepper powder production line, the chicken juice production line and the chicken powder production line is connected to the primary exhaust fan, and the exhaust gas exhaust end of the chicken essence production line is connected to the secondary exhaust fan. The primary exhaust fan and the secondary exhaust fan cooperate to form a multi-stage exhaust fan (3) system. S2. The power of the first-level exhaust fan is 18.5KW, and the power of the second-level exhaust fan is 37KW. According to the air volume calculation of each production line, it can be decided according to the actual production situation to decide which level of exhaust fan to open in order to achieve better processing effects and effectively save energy and reduce consumption. When only production lines other than chicken essence are opened, deodorization can be carried out by turning on the first-level exhaust fan. When only chicken essence production is opened, the second-level exhaust fan needs to be turned on for deodorization. When all four production lines are opened, both the first-level and second-level exhaust fans need to be turned on. S3. The waste gas to be treated drawn in by the multi-stage exhaust fan (3) is discharged into the first-stage spray tower (4) and the second-stage spray tower (5) in sequence. The two groups of spray towers spray and wash the waste gas. The washing tower adopts the principles of inertial collision, condensation, centrifugal force, swirl, etc. Under the power of the fan, the flue gas falls from a certain height and impacts the liquid surface at high speed to form water mist. Most of the particles sink into the water. Under the action of the diverter, the atomized airflow rises rapidly. The droplets further collide and condense to form a water-ash mixture. The water-ash mixture passes through the packing layer A (17) to remove organic matter and uses the demisting layer (18) to separate gas and water, thereby achieving the effect of removing organic matter and particulate matter. S4. The waste gas treated by the two groups of spray towers enters the interior of the biological filter box (6). The waste gas entering the interior of the biological filter box (6) is first washed by the washing chamber (21) and then treated by the packing layer B (22). After treatment, it is discharged through the filter chamber (23). The packing B inside the biological filter box (6) is a composite packing and a dominant microbial strain that are conducive to the attachment and growth of organisms. Under suitable environmental conditions, the microorganisms in the filter box form a biofilm on the surface of the packing B, using the inorganic and organic matter in the waste gas as a carbon source and energy source, maintaining their life activities by degrading odorous substances, and decomposing the odorous substances into odorless substances such as water, carbon dioxide and minerals, thereby achieving the purpose of purifying odorous gases. The purified waste gas is then discharged by the terminal induced draft fan (7) and the discharge pipe (8).

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