Underground closed deodorization system

Abstract

The invention relates to an underground closed deodorization system which comprises a water washing tower, a biological deodorization washing tower and a biological deodorization trickling filter tower which are buried underground, the water washing tower comprises a water washing tower body, the water washing tower body is provided with a washing deodorization part, a washing sprayer and a washing demister are arranged in the washing tower body from bottom to top, and the biological deodorization trickling filter comprises a trickling filter body; the trickling filtration tower body is provided with a trickling filtration deodorization part, and an activated carbon biological bed device, a trickling filtration sprayer and a trickling filtration demister are arranged in the trickling filtration tower body from bottom to top; the trickling filter sprayer is connected with the trickling filter deodorization part through a pipeline provided with a trickling filter circulating pump, so that the trickling filter nutrient solution is sprayed to the activated carbon biological bed device through the trickling filter sprayer. The system has the advantages that main equipment is buried underground, the occupied area is small, after two stages of biological towers are connected in series for treatment, microbial flora of the whole system is richer and more stable, and odor-causing components in odor are efficiently removed through mutual cooperation and mutual complementation of microorganisms at different stages.

Description

Technical Field

[0001] The present invention relates to the technical field of odor treatment, and in particular to a fully underground odor treatment system suitable for comprehensive odor treatment in confined spaces such as sewage treatment plants and garbage treatment facilities. Background Art

[0002] Biological deodorization towers are widely used in the field of odor pollution prevention and control due to their advantages of high deodorization efficiency, low operating cost, green energy saving, and no secondary pollution. Compared with deodorization equipment using chemical washing, activated carbon adsorption, and ion photolysis, the significant disadvantage of biological deodorization towers is that they occupy a large area and have a high initial construction cost.

[0003] In the current situation of tight land use for engineering construction, the mainstream approach to saving land is to make the interior of the biological deodorization tower into a double-layer packing structure to increase the residence time. Although this solution can reduce the floor space occupied by the equipment, it also has major defects: since the double-layer packing shares the circulating water tank at the bottom of the tower body, this inevitably requires that the microbial populations attached to and growing on the surface of each packing layer of the double-layer packing structure must be basically the same, which in turn makes it impossible to simultaneously and efficiently remove two odor pollutants of different properties in the biological deodorization tower.

[0004] Therefore, it is urgent to provide a solution to the technical problem that the biological deodorization tower system in the prior art occupies a large area and cannot efficiently remove odor pollutants at the same time. Therefore, the existing technology needs to be further improved. Summary of the invention

[0005] The present invention aims to provide an underground closed deodorization system which occupies a small area and can remove odor pollutants efficiently.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The underground closed deodorization system comprises a water washing tower, a biological deodorization washing tower and a biological deodorization trickling filter tower buried underground; the water washing tower comprises a water washing tower body, the inner wall of the water washing tower body near the bottom is provided with a water washing air inlet, the top of the water washing tower body is provided with a water washing air outlet pipe connected to the inside of the water washing tower body, and the top of the water washing tower body is provided with a water washing sprayer capable of spraying liquid into the inside of the water washing tower body; the biological deodorization washing tower comprises a washing tower body; a washing and deodorizing part for accommodating a washing nutrient solution is formed at the bottom of the washing tower body, a washing air inlet is provided on the inner wall of the washing tower body at the position where the washing and deodorizing part is provided, and the washing air outlet pipe is connected to the washing air inlet through a washing fan; a washing air outlet pipe connected to the inside of the washing tower body is provided at the top of the washing tower body; washing sprayers and washing demisters are provided from bottom to top in the washing tower body, and a washing nutrient solution is installed. A pipeline with a washing circulation pump connects the washing sprayer with the washing deodorization part so as to spray the washing nutrient solution toward the washing deodorization part through the washing sprayer; the biological deodorization trickling filter tower includes a trickling filter tower body; a trickling filter deodorization part for accommodating the trickling nutrient solution is formed at the bottom of the trickling filter tower body, and an activated carbon bio-bed device, a trickling filter sprayer and a trickling filter demister are arranged from bottom to top in the trickling filter tower body; a trickling filter air inlet is arranged on the inner side wall of the trickling filter tower body, and the trickling filter air inlet is located between the trickling filter deodorization part and the activated carbon bio-bed device, and the washing air outlet pipe is connected to the trickling filter air inlet via a trickling filter fan; a trickling filter outlet pipe connected to the inside of the trickling filter tower body is arranged on the top of the trickling filter tower body; a pipeline equipped with a trickling filter circulation pump connects the trickling filter sprayer with the trickling filter deodorization part so as to spray the trickling nutrient solution toward the activated carbon bio-bed device through the trickling filter sprayer.

[0007] The advantages of the present invention are that the main equipment is buried underground, occupying a small area. In addition, the biological deodorization scrubber acts as a high-load section for treating odor. The hydrogen sulfide in the odor can be initially removed in large quantities or converted into substances that are easily utilized by microorganisms, thereby reducing the concentration load of hydrogen sulfide entering the biological deodorization trickling filter and reducing the inhibitory effect of high-concentration hydrogen sulfide on microbial activity. At the same time, the high-load section provides abundant nutrients to promote the large-scale reproduction and growth of microorganisms, and cultivates bacterial communities with strong adaptability and metabolic capacity. In the biological deodorization trickling filter, the remaining hydrogen sulfide will be further finely treated to ensure that the concentration of hydrogen sulfide in the waste gas after treatment by the entire system reaches a lower level, thereby improving the hydrogen sulfide removal effect. After being treated in series by two-stage biological towers, the microbial flora of the entire system is richer and more stable. Through the cooperation and mutual complementation of microorganisms at different stages, the odor-causing components in the odor are efficiently removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a brief schematic diagram of an underground closed deodorization system in an embodiment of the present invention.

[0009] Figure 2 It is a brief schematic diagram of the biological deodorization washing tower in an embodiment of the present invention.

[0010] Figure 3 It is a brief schematic diagram of the biological deodorization trickling filter in an embodiment of the present invention.

[0011] Figure 4 Schematic diagram of a conventional demister in an embodiment of the present invention.

[0012] Figure 5 This is a schematic diagram of the three-dimensional structure of the washing demister and the trickling filter demister in an embodiment of the present invention.

[0013] Figure 6 It is a schematic cross-sectional view of the structure of the washing demister and the trickling demister in the embodiment of the present invention. DETAILED DESCRIPTION

[0014] As attached Figure 1 As shown, the underground closed deodorization system includes a water washing tower 1, a biological deodorization washing tower 2 and a biological deodorization trickling filter tower 3 buried underground.

[0015] The design and installation of underground closed deodorization systems must fully consider factors such as geological conditions, groundwater levels, and surrounding environment to ensure the stability and safety of the underground space.

[0016] First, according to the geological conditions, a detailed geological survey should be conducted to analyze parameters such as soil type and bearing capacity. According to the survey results, a suitable foundation form should be selected, such as raft foundation or pile foundation, to effectively disperse the weight of the building and prevent uneven settlement of the foundation. At the same time, a certain amount of deformation joints and post-casting strips should be reserved to accommodate the slight deformation that may occur in the underground structure during use.

[0017] Secondly, considering the influence of groundwater level, corresponding waterproof measures need to be taken. For example, waterproof membrane and waterproof coating can be installed on the outer wall of underground structure to form a multi-layer waterproof barrier to prevent groundwater leakage. In addition, drainage system can be installed inside the underground space to remove accumulated water in time and ensure the dryness of underground environment.

[0018] Furthermore, in order to improve the utilization efficiency of underground space, the structural design should focus on the reasonable layout of space. According to different functional requirements, various areas should be divided, such as equipment room, operation area, storage area, etc., and reasonable passages and stairs should be set up to facilitate the entry and exit of personnel and equipment. At the same time, factors such as ventilation and lighting should be taken into consideration, and vents and light wells should be reasonably set up to ensure air circulation and sufficient light in the underground space.

[0019] For the anti-leakage of underground structures, a series of comprehensive anti-leakage measures need to be taken. During the structural construction stage, the pouring quality of concrete should be strictly controlled to ensure the compactness and impermeability of concrete. Waterproof concrete can be used, and appropriate amounts of waterproofing agents and expansion agents can be added to improve the waterproof performance of concrete. At the same time, during the concrete pouring process, attention should be paid to vibration and compaction to avoid defects such as honeycomb surface.

[0020] In addition to the waterproofing measures of the concrete structure itself, it is also necessary to set up a waterproof layer on the outer wall and floor of the underground structure. Common waterproof layer materials include waterproof membranes, waterproof coatings, etc. Waterproof membranes can be selected from polymer waterproof membranes, such as PVC membranes, SBS membranes, etc., which have good water resistance and anti-aging properties. Waterproof coatings can be selected from cement-based penetrating crystalline waterproof coatings, polyurethane waterproof coatings, etc., which can form a dense waterproof film on the concrete surface and effectively prevent water penetration.

[0021] The specific structure of the underground closed deodorization system is introduced in detail below.

[0022] The water washing tower 1 includes a water washing tower body 11, the inner side wall of the water washing tower body 11 near the bottom is provided with a water washing air inlet 12, the top of the water washing tower body 11 is provided with a water washing air outlet pipe 13 connected to the inside of the water washing tower body 11, the top of the water washing tower body 11 is provided with a water washing sprayer 14 capable of spraying liquid into the inside of the water washing tower body 11, and a pipeline equipped with a water washing circulation pump 15 connects the water washing sprayer 14 with the bottom of the water washing tower body that collects the spraying water, so as to realize the recycling of the spraying liquid; the inner side wall of the water washing tower body 11 near the bottom is connected with an overflow pipe 16, and the bottom is connected with a discharge pipe 17 for discharging liquid.

[0023] The biological deodorizing washing tower 2 includes a washing tower body 21; a washing and deodorizing part 22 for accommodating a washing nutrient solution is formed at the bottom of the washing tower body 21, a washing air inlet 23 is arranged on the inner wall of the washing tower body 21 at the position where the washing and deodorizing part 22 is arranged, and the water washing air outlet pipe 13 is connected to the washing air inlet 23 via a washing fan; a washing air outlet pipe 24 connected to the inside of the washing tower body 21 is arranged on the top of the washing tower body 21; a washing sprayer 25 and a washing demister 26 are arranged from bottom to top in the washing tower body 21, and a pipeline equipped with a washing circulation pump 27 connects the washing sprayer 25 with the washing and deodorizing part 22 so as to spray the washing nutrient solution toward the washing and deodorizing part 22 through the washing sprayer 25.

[0024] In the biological deodorization scrubber 2, the biological community is operating at a high load, and the odor enters the nutrient solution by bubbling, and then disperses in the nutrient solution in the form of tiny bubbles, thereby greatly increasing the contact area between the gas and liquid phases, facilitating the mass transfer process of hydrogen sulfide to the nutrient solution, facilitating the degradation of microorganisms, and improving the reaction rate and removal efficiency.

[0025] Moreover, when the odor flow or concentration fluctuates to a certain extent, the dispersed bubbles in the nutrient solution can play a certain buffering role, reduce the impact on the entire system, and maintain stable operation.

[0026] The biological deodorization trickling filter tower 3 includes a trickling filter tower body 31; a trickling filter deodorization section 32 for accommodating a trickling filter nutrient solution is formed at the bottom of the trickling filter tower body 31, and an activated carbon bio-bed device 33, a trickling filter sprayer 34 and a trickling filter demister 35 are arranged from bottom to top in the trickling filter tower body 31; the trickling filter tower body 31 is provided with a trickling filter air inlet 36, and the trickling filter air inlet 36 is located between the trickling filter deodorization section 32 and the activated carbon bio-bed device 33, and the washing air outlet pipe 24 is connected to the trickling filter air inlet 36 via a trickling filter fan; a trickling filter outlet pipe 37 connected to the inside of the trickling filter tower body 31 is arranged at the top of the trickling filter tower body 31; a pipeline equipped with a trickling filter circulation pump 38 connects the trickling filter sprayer 34 with the trickling filter deodorization section 32 to spray the trickling filter nutrient solution to the activated carbon bio-bed device 33 through the trickling filter sprayer 34.

[0027] In the biological deodorization trickling filter 3, the biological community is in low-load operation. After the trickling nutrient solution is sprayed to the activated carbon bio-bed device 33 through the trickling filter sprinkler 34, microbial flocs will form on the surface of the activated carbon particles in the activated carbon bio-bed device 33, thereby utilizing the adsorption of microbial flocs and the specific surface area of ​​activated carbon to achieve the removal of low-concentration hydrogen sulfide. The odor enters the reaction layer directly from under the activated carbon bed, which saves gas supply energy relative to the direct air intake method, and the concentration of hydrogen sulfide entering the biological deodorization trickling filter 3 has been significantly reduced, and after absorption and conversion in the biological deodorization washing tower 2, it becomes easier to be absorbed and utilized by microorganisms. At the same time, the odor does not directly contact the nutrient solution in the biological deodorization trickling filter 3, which is conducive to reducing the risk of nutrient solution contamination, maintaining a good growth environment for the microbial flora in the activated carbon layer, and extending the service life of the nutrient solution.

[0028] The washing sprayer 25 is connected to the washing deodorizing section 22 via a pipeline connected to a washing circulation pump 27 ; the dripping sprayer 34 is connected to the dripping deodorizing section 32 via a pipeline connected to a dripping circulation pump 38 .

[0029] The trickling filter outlet pipe 37 is connected to the activated carbon deodorization tower 4 and the deodorization fan 5 in sequence through a pipeline. The flow direction of the odor in the whole system is as shown in the following figure. Figure 1 The route shown is 100 forward.

[0030] When in use, each odor source needs to be partially covered and sealed with a hood. The odor generated by each odor extraction source is collected and transported to the underground closed deodorization system through the air duct collection system. The collected odor first enters the water washing tower 1 to remove a part of the odor components and dust that are easily soluble in water for water washing pretreatment. After the water washing pretreatment, the odor enters the biological deodorization washing tower 2. This tower is a high-load process section, which mainly removes odor components that are relatively easy to degrade, such as hydrogen sulfide; under this working condition, all microorganisms work at full load, which can effectively reduce the required filler volume. However, under high-load conditions, the system has high energy consumption, the floor space is still large, and it is easy to produce a certain amount of residual sludge that needs to be treated. Then it enters the biological deodorization trickling filter tower 3. This tower is a low-load process section, and the microorganisms are in a hungry state, which can more thoroughly treat biodegradable odors. Of course, it is necessary to strictly control temperature, humidity, pH value and other conditions to avoid affecting the normal growth and metabolism of microorganisms. If there are too many particulates in the exhaust gas or the microorganisms grow too fast, it may cause the packing to be blocked, affecting the exhaust gas passage and treatment effect, and regular backwashing and other maintenance work are required.

[0031] The biological deodorization scrubber 2 is a high-load section for treating odor. The hydrogen sulfide in the odor can be initially removed in large quantities or converted into substances that are easy for microorganisms to use, reducing the hydrogen sulfide concentration load entering the biological deodorization trickling filter 3 and reducing the inhibitory effect of high-concentration hydrogen sulfide on microbial activity. At the same time, the high-load section provides rich nutrients to promote the large-scale reproduction and growth of microorganisms and cultivate bacterial communities with strong adaptability and metabolic capacity. In the biological deodorization trickling filter 3, the remaining hydrogen sulfide will be further finely treated to ensure that the hydrogen sulfide concentration in the waste gas treated by the entire system reaches a lower level, thereby improving the hydrogen sulfide removal effect. After the two-stage biological tower is treated in series, the microbial flora of the entire system is richer and more stable. Through the mutual cooperation and mutual complementation of microorganisms at different stages, the odor-causing components in the odor are effectively removed, and finally pass through the activated carbon deodorization tower 4. Through the adsorption of activated carbon, it is ensured that the treated odor meets the emission standards, and then after being pressurized by the deodorization fan 5, it is discharged in an organized manner to the designated emission point. The activated carbon deodorizing tower 4 is used as an emergency device. If the odor has reached the emission standard after being treated by the front-end device, the activated carbon deodorizing tower 4 can be stopped from use.

[0032] The mechanism of biotower degradation of hydrogen sulfide is mainly to utilize the metabolism of microorganisms to convert hydrogen sulfide into harmless or easy-to-handle substances. The washing nutrient solution and trickling nutrient solution are composed of the following components: i) 0.2-0.35 g / L glucose (C6H 12 O6); ii), 0.4-0.6g / L ammonium sulfate ((NH4)2SO4); iii) 2.0-3.5g / L potassium dihydrogen phosphate (KH2PO4); iv), 0.2-0.25 g / L magnesium sulfate heptahydrate (MgSO4•7H2O); v), 0.01-0.02 g / L iron nitrate nonahydrate (Fe(NO3)3•9H2O); vi) 5-15% biogas slurry; vii), 0.1-0.3% isomaltooligosaccharide (prebiotic); The washing nutrient solution contains: i) Thiobacillus ferrooxidans strain ATCC 7953, concentration 1.5-3.0×10 8 CFU / mL; ii), Nitrobacter winogradskyi strain NBRC 14165, concentration 0.8-1.2×10 8 CFU / mL; The drip nutrient solution contains: i) Acidithiobacillus thiooxidans strain DSM 17318, concentration 2.0-4.0×10 8 CFU / mL; ii), Pseudomonas stutzeri strain ATCC 17588, concentration 1.0-2.5×10 8 CFU / mL; iii) Xanthomonas axonopodis strain ATCC 33913, concentration 0.5-1.5×10 8 CFU / mL; iv) Add 0.05-0.15% natural essential oil (such as menthol).

[0033] In addition, the scrubbing demister 26 and the trickling filter demister 35 can be conventional demisters, such as those shown in the attached Figure 4 As shown, specifically, both include a frame and a wire mesh laid in the frame, the wire mesh is a porous object woven from metal and plastic wires, specifically, the wire mesh has a thickness of 100-150 mm, a wire mesh diameter of 0.10-0.28 mm, a specific surface area of ​​350-400 m2 / m³, a porosity of not less than 95%, and a pressure drop of 150-300 Pa. The wire mesh with these parameters has a good removal effect on droplets of 2*10^-6~5*10^-6 m.

[0034] Conventional demisters cannot achieve a good demisting effect. This embodiment provides a demister with a better demisting effect, which is used in the biological deodorization washing tower 2 and the biological deodorization trickling filter tower 3.

[0035] Combined with Figure 5 and Zhifu Figure 6 As shown, the washing demister 26 and the trickling filter demister 35 each include a fixing frame, which is fixedly installed in the corresponding washing tower body 21 and the trickling filter tower body 31 in accordance with the inner shape of the tower body so that it can completely fit the inner surface of the tower body; a plurality of demister components 62 are arranged in the fixing frame, and the demister components 62 include a square frame 63 and two rotating rollers 64 mounted on the square frame 63 and each of which can rotate around a central axis, and the two rotating rollers 64 are arranged horizontally and parallel to each other; a plurality of mounting grooves extending along the axial direction of the rotating roller 64 are opened on the side wall of the rotating roller 64, and a blade 65 is fixedly arranged on the mounting groove, and the blade 65 is covered with through holes 651 passing through the two surfaces of the blade 65; when the two rotating rollers 64 are driven to rotate by the driving device, on a cross section perpendicular to the central axis, the rotating roller 64 located on the left rotates counterclockwise and the rotating roller 64 located on the right rotates clockwise.

[0036] When in use, the two rotating rollers 64 in each defogger assembly 62 rotate in opposite directions, and the blades 65 drive the gas flow, so that the airflow flows from directly below the square frame 63 to the above. The liquid particles in the gas collide with or adhere to the upper surface 652 of the blade 65 during this movement. After the blade 65 starts to rotate 180 degrees from between the two rotating rollers 64, the upper surface 652 of the blade 65 is at the bottom, and the tiny liquid particles attached to the surface of the blade 65 accumulate to form water droplets and drip to the bottom of the tower body under the action of gravity.

[0037] A total of four groups of defogger assemblies 62 are arranged in the fixed frame, and the four groups of defogger assemblies 62 are spliced ​​together in the form of two groups in the horizontal direction and two groups in the vertical direction; the axial direction of the central axis is defined as the longitudinal direction and the radial direction of the central axis is defined as the horizontal direction. In the vertical direction, one end of the rotating rollers 64 of two adjacent defogger assemblies 62 are butt-connected together through a coupling, and the other ends of the two rotating rollers 64 are fixedly connected to a sprocket 66 after passing through the square frame 63. The driving device includes a motor, a motor driving wheel and a chain connected to the motor driving wheel. In the horizontal direction, the chain is sequentially connected to the sprocket 66 of each rotating roller 64 in a wave-like manner. The chain is shown in the attached Figure 5 The route shown by the midpoint line 67 can be driven by the same motor, so that the rotating roller 64 on the left side of each demisting assembly 62 rotates counterclockwise and the rotating roller 64 on the right side rotates clockwise.

[0038] The blade 65 is an arc-shaped blade 65. On a cross section perpendicular to the central axis, the blade 65 extends outward from one end connected to the rotating roller 64 along its rotation direction, thereby increasing the surface area of ​​the blade 65, increasing the number of through holes 651 of a single blade 65, and improving the demisting effect.

[0039] The blade 65 is made of polypropylene material. A scraper bar 68 is provided in the square frame 63 corresponding to each rotating roller 64. The scraper bar 68 is provided in the same direction as the rotating roller 64 and is located near the end where the blade 65 and the rotating roller 64 are connected. The scraper bar 68 corresponding to the left rotating roller 64 is located at the lower left position of the left rotating roller 64, and the scraper bar 68 corresponding to the right rotating roller 64 is located at the lower right position of the right rotating roller 64. That is, after the blade 65 rotates 180 degrees, the lower surface of the blade 65 is at the bottom, and the fine liquid particles attached to the surface of the blade 65 will be scraped off under the action of the scraper bar 68, so as to ensure that no liquid accumulates on the surface of the blade 68, thereby improving the demisting effect. The blade 65 is made of polypropylene material, has good resilience and bending fatigue resistance, and the blade will be elastically deformed under the action of the scraper bar 68, and return to its original state after passing through the scraper bar 68.

[0040] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention are all equivalent replacement modes and are included in the protection scope of the present invention.

Claims

1. Underground closed deodorization system, characterized in that: It includes a water scrubber, a biological deodorizing scrubber and a biological deodorizing trickling filter tower buried underground; The water washing tower comprises a water washing tower body, the inner side wall of the water washing tower body near the bottom is provided with a water washing air inlet, the top of the water washing tower body is provided with a water washing air outlet pipe connected to the inside of the water washing tower body, and the top of the water washing tower body is provided with a water washing sprayer capable of spraying liquid into the inside of the water washing tower body; The biological deodorizing washing tower comprises a washing tower body; a washing deodorizing part for accommodating washing nutrient solution is formed at the bottom of the washing tower body, a washing air inlet is arranged on the inner side wall of the washing tower body at the position where the washing deodorizing part is arranged, and the water washing air outlet pipe is connected to the washing air inlet via a washing fan; A washing gas outlet pipe connected to the inside of the washing tower body is arranged on the top of the washing tower body; A washing sprayer and a washing demister are arranged from bottom to top in the washing tower body, and a pipeline equipped with a washing circulation pump connects the washing sprayer with the washing and deodorizing part so as to spray the washing nutrient solution toward the washing and deodorizing part through the washing sprayer; The biological deodorization trickling filter tower comprises a trickling filter tower body; a trickling filter deodorization part for accommodating a trickling filter nutrient solution is formed at the bottom of the trickling filter tower body, and an activated carbon bio-bed device, a trickling filter sprayer and a trickling filter demister are arranged from bottom to top in the trickling filter tower body; a trickling filter air inlet is arranged on the inner side wall of the trickling filter tower body, and the trickling filter air inlet is located between the trickling filter deodorization part and the activated carbon bio-bed device, and the washing air outlet pipe is connected to the trickling filter air inlet via a trickling filter fan; a trickling filter outlet pipe connected to the inside of the trickling filter tower body is arranged on the top of the trickling filter tower body; a pipeline equipped with a trickling filter circulation pump connects the trickling filter sprayer with the trickling filter deodorization part to spray the trickling filter nutrient solution to the activated carbon bio-bed device through the trickling filter sprayer.

2. The underground closed deodorization system according to claim 1, characterized in that: a) Both washing nutrient solution and trickling nutrient solution are composed of the following ingredients: i) 0.2-0.35 g / L glucose; ii), 0.4-0.6g / L ammonium sulfate; iii) 2.0-3.5 g / L potassium dihydrogen phosphate; iv), 0.2-0.25 g / L magnesium sulfate heptahydrate; v), 0.01-0.02 g / L ferric nitrate nonahydrate; vi) 5-15% biogas slurry; vii), 0.1-0.3% isomaltooligosaccharide; b) Cultivate in washing nutrient solution: i) Thiobacillus ferrooxidans strain ATCC 7953, concentration 1.5-3.0×10 8 CFU / mL; ii), Nitrobacter winogradskyi strain NBRC 14165, concentration 0.8-1.2×10 8 CFU / mL; c) Cultivated in drip nutrient solution: i) Acidithiobacillus thiooxidans strain DSM 17318, concentration 2.0-4.0×10 8 CFU / mL; ii), Pseudomonas stutzeri strain ATCC 17588, concentration 1.0-2.5×10 8 CFU / mL; iii) Xanthomonas axonopodis strain ATCC 33913, concentration 0.5-1.5×10 8 CFU / mL; iv) Add 0.05-0.15% natural essential oil.

3. The underground closed deodorization system according to claim 1, characterized in that: The washing sprayer is connected to the washing deodorizing part through a pipeline connected to a washing circulation pump; the dripping filter sprayer is connected to the dripping filter deodorizing part through a pipeline connected to a dripping filter circulation pump.

4. The underground closed deodorization system according to claim 1, characterized in that: The trickling filter outlet pipe is sequentially connected to an activated carbon deodorizing tower and a deodorizing blower through pipelines.

5. The underground closed deodorization system according to any one of claims 1 to 4, characterized in that: The scrubbing demister and the trickling filter demister both comprise a frame and a wire mesh laid in the frame, wherein the wire mesh is a porous object woven from metal and plastic wires.

6. The underground closed deodorization system according to any one of claims 1 to 4, characterized in that: The washing demister and the trickling filter demister each include a fixing frame, which is fixedly mounted in the corresponding washing tower body and the trickling filter tower body; a plurality of demister components are arranged in the fixing frame, and the demister components include a square frame and two rotating rollers mounted on the square frame and each of which can rotate around a central axis, and the two rotating rollers are arranged horizontally and parallel to each other; a plurality of mounting grooves extending along the axial direction of the rotating roller are opened on the side wall of the rotating roller, and blades are fixedly mounted on the mounting grooves, and the blades are covered with through holes passing through the two surfaces of the blades; when the two rotating rollers are driven to rotate by the driving device, on a cross section perpendicular to the central axis, the rotating roller on the left rotates counterclockwise and the rotating roller on the right rotates clockwise.

7. The underground closed deodorization system according to claim 6, characterized in that: A total of four groups of defogger assemblies are arranged in the fixed frame, and the four groups of defogger assemblies are spliced ​​together in the form of two groups in the horizontal direction and two groups in the vertical direction; the axial direction of the central axis is defined as the longitudinal direction and the radial direction of the central axis is defined as the horizontal direction, and in the vertical direction, one end of the rotating rollers of two adjacent defogger assemblies are butt-connected together through a coupling, and the other ends of the two rotating rollers are fixedly connected with sprockets after passing through the square frame, and the driving device includes a motor, a motor driving wheel and a chain connected to the motor driving wheel, and in the horizontal direction, the chain is sequentially wound around the sprockets of each rotating roller in a wavy form.

8. The underground closed deodorization system according to claim 6, characterized in that: The blade is an arc-shaped blade. On a cross section perpendicular to the central axis, the blade extends outward from one end connected to the rotating roller along the rotating direction thereof.

9. The underground closed deodorization system according to claim 6, characterized in that: The blade is made of polypropylene material, and a scraper bar is arranged corresponding to each rotating roller in the square frame. The scraper bar is arranged in the same direction as the rotating roller and is located close to the end where the blade is connected to the rotating roller. The scraper bar corresponding to the left rotating roller is located at the lower left position of the left rotating roller, and the scraper bar corresponding to the right rotating roller is located at the lower right position of the right rotating roller.

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