Double-bacterium-zone multistage biological deodorization system

Abstract

The invention discloses a multi-stage biological deodorization system with double bacterium areas. The system comprises N circulating units formed by sequentially arranging desulfurization biological reaction zones and denitrification biological reaction zones according to the airflow direction, wherein N is greater than or equal to 1; the desulfurization biological reaction zone comprises a biological filler layer I, a desulfurization strain and a nutrient solution I, and the denitrification biological reaction zone comprises a biological filler layer II, a denitrification strain and a nutrient solution II; wherein the biological filler layer I and the biological filler layer II are respectively arranged at the middle parts of the desulfurization biological reaction area and the denitrification biological reaction area, the volume ratio is 1: 2, and waste gas enters from the bottom end of the system and flows back in the system. The biological deodorization system can obviously improve the deodorization efficiency and the system stability.

Description

Technical Field

[0001] This invention relates to a deodorization system, specifically a dual-bacterial zone multi-stage biological deodorization system, belonging to the field of waste gas treatment technology. Background Technology

[0002] Food waste, rich in various organic matter, is highly susceptible to decomposition, producing foul-smelling exhaust gases. According to the types of odor pollutants in the "Odor Pollutant Emission Standard" (GB14554-1993) and related literature research, the odor-causing components in food waste exhaust gases (hereinafter referred to as "exhaust gases") mainly include the following two categories:

[0003] (1) Sulfur-containing compounds, including hydrogen sulfide, methanethiol, dimethyl sulfide, dimethyl disulfide, etc.

[0004] (2) Nitrogen-containing compounds, including amines and diamines, such as ammonia, trimethylamine and dimethylamine.

[0005] The odorous gases in kitchen waste exhaust are complex in composition, and the stench that people perceive is usually a compound smell formed by a mixture of various odorous substances. Although the concentration of these odorous pollutants is low, their low odor threshold and complex composition can still cause significant discomfort even at low concentrations.

[0006] Common methods for treating kitchen waste exhaust gas include physical, chemical, and biological methods. Biological methods involve using microorganisms to absorb and decompose polluting exhaust gases. This method utilizes the characteristic of microorganisms to absorb organic waste gases as nutrients during their growth and reproduction, degrading harmful components in the exhaust gas into carbon dioxide, water, and cellular substances, thereby achieving the purpose of treating the exhaust gas. This method has the advantages of a wide applicable odor concentration range, low investment, simple operation and maintenance, and no secondary pollution.

[0007] The core of biological treatment of organic waste gas is the biofilm. Its basic principle involves using microbial propagation technology to cultivate, domesticate, and enrich various specialized microbial strains. These strains are then inoculated onto the surface of porous packing material to form a biofilm layer. When waste gas containing various volatile organic compounds flows through the packed tower, the pollutants are transferred to the biofilm due to diffusion. Under suitable environmental conditions, this biofilm grows and reproduces through biochemical reactions via microbial enzymes, using the organic components in the waste gas as nutrients and degrading them into carbon dioxide, water, and cellular components, thereby achieving the purpose of purifying the waste gas.

[0008] Currently, microbial methods for treating odorous gases are relatively common, but they still have significant drawbacks in practical applications:

[0009] (1) Low gas-liquid-microorganism contact efficiency: Most of the odorous pollutants in the waste gas are insoluble in water and require sufficient gas-liquid-microorganism contact time. However, the existing treatment process limits the full contact between the waste gas and the loaded microbial packing material, resulting in insufficient contact area and short contact time, which directly affects the degradation effect on odor-causing components.

[0010] (2) Uneven distribution of exhaust gas and poor adaptability of microorganisms: The integrated filter bed design is prone to uneven distribution of exhaust gas, which can cause local gas short circuits, resulting in local absence and insufficient activity of microorganisms inside the filter bed. At the same time, its fixed microbial community structure is difficult to adapt to the complex and variable composition of exhaust gas, resulting in fluctuating treatment efficiency and poor stability.

[0011] Chinese patent CN119455651B discloses a biological filter and a method for treating VOCs and odorous gases. The biological filter includes a second spray chamber, which, from bottom to top, consists of a second water storage tank, a second air distribution layer, a second packing layer, and a second spray layer. The second packing layer, from bottom to top, comprises first, second, and third movable microbial biofilm packing layers. Several stirring devices are installed in the first and second movable microbial biofilm packing layers. However, the entire filter in this patent remains a single biological phase environment with mixed microbial communities. The microbial communities in all packing layers are mixed together without functional zoning. Furthermore, it focuses on solving the problem of packing caking, relying solely on the traditional "air distribution layer" to address the issue of uniform gas distribution in the filter bed, lacking active flow guidance and optimized design.

[0012] Chinese Patent Publication No. CN119455650B discloses a single-tower multi-stage biological deodorization tower with zoned spraying and its deodorization control method. The biological deodorization tower includes: a tower body, a circulating water tank at the bottom of the tower body, a main air inlet pipe connected to the upper space of the circulating water tank, and a main air outlet pipe connected to the top of the tower body; biological spraying deodorization modules, with N-stage biological spraying deodorization modules arranged in pairs from bottom to top in the tower body to form (N-1) interval zones between the N-stage biological spraying deodorization modules, where N≥2 and is an integer; and water-gas two-phase separation modules, with (N-1)-stage water-gas two-phase separation modules arranged in the (N-1) interval zones from bottom to top; the spray liquid of the first-stage biological spraying deodorization module located above the main air inlet pipe is supplied by the circulating water tank, and the spray liquid of the second to N-stage biological spraying deodorization modules is supplied by the water-gas two-phase separation modules arranged in the adjacent lower interval zones. However, the patent's "zoning" is a physical zoning based on the spray liquid process and purification, rather than a biological zoning based on the function of microbial strains. The microbial communities in each level are still mixed, making it impossible to achieve specific microbial enrichment for different pollutants such as sulfur and nitrogen. The exhaust gas enters from the bottom and exits from the top, which is a traditional unidirectional upflow type. Although multiple stages are set, the gas distribution still relies on traditional gas distribution methods and lacks effective flow guidance measures, so there is still a risk of "uneven exhaust gas distribution" and "local short circuit".

[0013] Therefore, it is of great significance to develop a deodorization system with high waste gas treatment efficiency and stable operation. Summary of the Invention

[0014] To address the problems existing in the prior art, this invention provides a dual-bacterial-zone multi-stage biological deodorization system. This invention solves the process efficiency problem through optimized gas path design and addresses the biological phase problem through a dual-bacterial-zone process. The synergistic effect of these two technologies significantly improves the deodorization efficiency and operational stability of the biological deodorization system.

[0015] To achieve the above-mentioned technical objectives, the present invention provides a dual-zone multi-stage biological deodorization system, comprising N circulating units formed by sequentially arranging desulfurization biological reaction zones and denitrification biological reaction zones according to the airflow direction, where N≥1; the desulfurization biological reaction zone includes a biological packing layer I, desulfurization bacteria and nutrient solution I, and the denitrification biological reaction zone includes a biological packing layer II, denitrification bacteria and nutrient solution II; wherein, the biological packing layer I and the biological packing layer II are respectively located in the middle of the desulfurization biological reaction zone and the denitrification biological reaction zone, with a volume ratio of 1:2;

[0016] According to the airflow direction, the exhaust gas enters from the bottom of the desulfurization bioreactor zone of the first circulation unit, passes through the biological packing layer I from the bottom to the top, and then enters the denitrification bioreactor zone of the first circulation unit from the top. After passing through the biological packing layer II from the top to the bottom, it is discharged from the bottom, or enters the next circulation unit from the bottom and flows according to the gas flow pattern of the first circulation unit. The exhaust gas flows back and forth in the system.

[0017] This invention separates the desulfurization and denitrification functional zones and controls the airflow direction to directionally zigzag within the system, ensuring optimal growth environments for different functional microbial species. This prevents interference between functional bacteria, maintains consistently high deodorization efficiency, optimizes the microbial growth environment, and solves problems such as uneven distribution. The biological packing material in the bioreactor zone is used to cultivate deodorizing microbial colonies. Since the desulfurization efficiency of the desulfurization bioreactor zone is approximately twice that of the denitrification bioreactor zone, controlling the volume ratio of the two bioreactor zones differentiates the residence time of the two functional microbial zones, thereby improving the overall deodorization efficiency.

[0018] As a preferred option, N=2 or 3.

[0019] As a preferred embodiment, the desulfurizing bacteria include at least one of Thiobacillus thiooxidans, Thiobacillus thiopureum, Microfibrillariae, Pseudomonas putidae, and Pseudomonas schrenckii.

[0020] As a preferred embodiment, the initial inoculation of the desulfurization bacteria strain shall contain a total live bacteria count of not less than 1 × 10⁻⁶. 10 CFU / g.

[0021] As a preferred embodiment, the filler material in the biological filler layer I comprises igneous rock, charcoal material, and limestone. The igneous rock is preferably volcanic rock. The charcoal material is preferably bamboo charcoal. The filler layer is constructed by alternating layers of igneous rock, charcoal material, and limestone from bottom to top.

[0022] Carbon materials, which serve not only as carriers for microbial attachment but also as conductors for electron transfer between microorganisms, need to be layered in the packing material.

[0023] As a preferred embodiment, the temperature of the biological packing layer I is 25~35℃, the pH is 5~7, and the humidity is 60~70%.

[0024] As a preferred embodiment, the nutrient solution I comprises sodium thiosulfate, potassium dihydrogen phosphate, magnesium chloride, sodium bicarbonate, ferrous sulfate, and zinc sulfate.

[0025] As a preferred embodiment, the mass ratio of the igneous rock, carbonaceous material, and limestone is (2.5~3.5):(0.8~1.5):(0.8~1.5).

[0026] As a preferred embodiment, the concentration of the thiosulfate is 10.0~20.0 g / L. The thiosulfate is preferably sodium thiosulfate.

[0027] As a preferred option, the concentration of the alkali metal phosphate is 1.0~2.0 g / L. Potassium dihydrogen phosphate is preferred as the alkali metal phosphate.

[0028] As a preferred option, the concentration of the magnesium salt is 0.2~0.5 g / L. The preferred magnesium salt is magnesium chloride.

[0029] As a preferred option, the concentration of the alkali metal bicarbonate is 1.0~3.0 g / L. Sodium bicarbonate is preferred as the alkali metal bicarbonate.

[0030] As a preferred option, the concentration of the ferrous salt is 0.05~0.1 g / L. The preferred ferrous salt is ferrous sulfate.

[0031] As a preferred option, the concentration of the zinc salt is 0.01~0.05 g / L. The preferred zinc salt is zinc sulfate.

[0032] As a preferred embodiment, the denitrifying bacteria include at least one of Nitrifying Bacillus, Nitrosomonas, Denitrifying Pseudomonas, Paracoccus, and Amine-eating Pseudomonas.

[0033] As a preferred embodiment, the initial inoculation of the denitrifying bacteria strain has a total viable count of not less than 1 × 10⁻⁶. 10 CFU / g.

[0034] As a preferred embodiment, the filler material in the biological filler layer II comprises igneous rock and carbon material. The igneous rock is preferably volcanic rock. The carbon material is preferably bamboo charcoal. The igneous rock and carbon material are alternately laid from bottom to top in the filler layer.

[0035] As a preferred embodiment, the temperature of the biological packing layer II is 25~35℃, the pH is 6~8, and the humidity is 50~65%.

[0036] As a preferred embodiment, the nutrient solution II comprises an organic carbon source, cellulose, alkali metal phosphates, and calcium salts.

[0037] As a preferred embodiment, the mass ratio of the igneous rock to the carbonaceous material is 2.5~3.5:0.8~1.5.

[0038] As a preferred embodiment, the concentration of the organic carbon source is 5-10 g / L. Glucose is a preferred organic carbon source.

[0039] As a preferred option, the concentration of cellulose is 2-5 g / L. The preferred cellulose is carboxymethyl cellulose.

[0040] As a preferred option, the concentration of the alkali metal phosphate is 1.0~2.0 g / L. The preferred alkali metal phosphate is sodium dihydrogen phosphate.

[0041] As a preferred option, the concentration of the calcium salt is 1.0~2.0 g / L. The preferred calcium salt is calcium carbonate.

[0042] As a preferred embodiment, the desulfurization bioreactor zone of the first circulation unit is provided with an air inlet at the bottom, and the denitrification bioreactor zone of the last circulation unit is provided with an air outlet at the bottom. Both the air inlet and the air outlet are equipped with gas guiding devices. The top of the desulfurization bioreactor zone and the denitrification bioreactor zone in each circulation unit are respectively provided with spray devices, and the bottom of each is respectively provided with liquid collection devices. The spray devices are used to spray the circulating liquid or nutrient solution of the corresponding bioreactor zone.

[0043] As a preferred embodiment, the desulfurization bioreactor zone and the denitrification bioreactor zone are connected by a gas guiding device. Specifically, the tops of the desulfurization and denitrification bioreactor zones within a circulation unit are connected by a gas guiding device, and the bottoms of the denitrification and desulfurization bioreactor zones between circulation units are connected by a gas guiding device. Installing airflow guiding devices between adjacent bioreactor zones increases the airflow area and distance, thereby improving the effective residence time of exhaust gas in the bioreactor zone.

[0044] As a preferred embodiment, the initial concentration of sulfur-containing compounds in the exhaust gas is 95-135 ppm, and the initial concentration of ammonia nitrogen compounds is 50-300 ppm, more preferably 100-300 ppm.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] (1) This invention provides a more optimized growth environment for microorganisms through the differentiated design of independent dual-bacterial zones, effectively avoids the phenomenon of local microbial absence or inactivation, improves the reaction efficiency of functional bacterial zones, and greatly enhances deodorization efficiency and system stability.

[0047] (2) By directional airflow guidance and distributed airflow control, the airflow area and path are increased, the effective residence time of exhaust gas in the biological reaction zone is significantly increased, the deodorization efficiency is improved, and the internal space is effectively utilized and optimized, avoiding the phenomenon of local gas short circuit. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0049] Figure 1 This is a simplified diagram of the dual-strain multi-level biological deodorization system of Embodiment 1 of the present invention.

[0050] Figure 2 This is an enlarged view of the air inlet, air outlet, and gas guiding device in the diagram of the dual-strain multi-stage biological deodorization system of Embodiment 1 of the present invention. Detailed Implementation

[0051] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] Example 1

[0053] This invention relates to a dual-strain multi-stage biological deodorization system for treating malodorous waste gas generated during the treatment of kitchen waste, with a waste gas flow rate of 20,000 m³ / h. 3 The system consists of a rectangular filter bed housing welded from stainless steel plates, measuring 12.0m (length) × 3.5m (width) × 4.0m (height). The housing is divided into four bioreactor zones by partitions, from left to right: the first desulfurization bioreactor zone, the first denitrification bioreactor zone, the second desulfurization bioreactor zone, and the second denitrification bioreactor zone. The first desulfurization and first denitrification bioreactor zones constitute the first circulation unit, while the second desulfurization and second denitrification bioreactor zones constitute the second circulation unit. The bioreactor zones with the same function have the same volume, and the volume ratio of the desulfurization bioreactor zone to the denitrification bioreactor zone is 1:2. The height of the packing layer in each bioreactor zone is 2.5m. The upper surface of the packing layer is 0.6m from the top of the filter bed, and the lower surface of the packing layer is 0.9m from the bottom of the filter bed. The packing layer of the desulfurization bioreactor zone is a composite packing layer I, which is filled from bottom to top with volcanic rock, bamboo charcoal, and limestone in a mass ratio of 3:1:1. Two layers of composite packing layer I are laid. The packing layer of the denitrification bioreactor zone is a composite packing layer II, which is filled from bottom to top with volcanic rock and bamboo charcoal in a mass ratio of 3:1. Two layers of composite packing layer II are laid. The bamboo charcoal not only serves as a carrier for microorganisms but also plays a role in electron transfer between microorganisms.

[0054] The packing layers of each desulfurization bioreactor zone are inoculated with *Thiobacillus thiooxidans*, *Thiobacillus thioregenerative*, and *Pseudomonas putida* to degrade sulfur-containing compounds such as hydrogen sulfide and methanethiol. The concentration ratio of each bacterial species is 1:1:1, and the total viable count inoculated is 5 × 10⁻⁶. 10CFU / g; The microbial nutrient solution in the desulfurization bioreactor zone contains 15 g / L sodium thiosulfate, 2 g / L potassium dihydrogen phosphate, 0.2 g / L magnesium chloride, 2 g / L sodium bicarbonate, 0.05 g / L ferrous sulfate, and 0.01 g / L zinc sulfate. The pH of the nutrient solution is adjusted to 6.0 with dilute sulfuric acid. The nutrient solution can be added to the packing layer by spraying. The temperature of the packing layer in the desulfurization bioreactor zone is controlled at 30±2℃, and the humidity is maintained at 60%.

[0055] Nitrifying Bacillus, Nitrosomonas, and Denitrifying Pseudomonas were inoculated into the packing layer of each denitrification bioreactor zone to treat nitrogen-containing compounds such as ammonia and trimethylamine. The concentration ratio of each bacterial species was 1:1:1, and the total viable count of the inoculated bacteria was 5 × 10⁻⁶. 10 CFU / g; The microbial nutrient solution in the denitrification bioreactor contains 8 g / L glucose, 3 g / L carboxymethyl cellulose, 1.0 g / L sodium dihydrogen phosphate and 1.5 g / L calcium carbonate. The pH of the nutrient solution is 7.0. The nutrient solution can be added to the packing layer by spraying. The temperature of the packing layer in the denitrification bioreactor is controlled at 30±2℃ and the humidity is maintained at 50%.

[0056] An air inlet is located on the lower left side wall of the first desulfurization bioreactor zone in the filter bed, and an air outlet is located on the lower right side wall of the second denitrification bioreactor zone. Gas guide plates are installed at both the air inlet and outlet. Nutrient solution collection tanks are located at the bottom of each bioreactor zone, guiding the solution to the corresponding circulating water tank. Horizontal supports are installed within each bioreactor zone, holding biological packing material. A distribution pipe is located at the top, with a nozzle at the outlet for spraying the nutrient solution (circulating liquid) of the corresponding bioreactor zone. Gas guide plates are located at the top of the connection between the first and first denitrification bioreactor zones, at the bottom of the connection between the first and second desulfurization bioreactor zones, and at the top of the connection between the second and second desulfurization bioreactor zones. The circulation system of each bioreactor zone is equipped with a pH meter, thermometer, level gauge, and electric heating device. Sensors monitor environmental parameters in real time and feed the signals back to the control system, automatically adjusting the nutrient solution supply and temperature to maintain the optimal growth environment for each microbial community.

[0057] The waste gas from food waste enters the system through the air inlet at the lower left side wall of the first desulfurization bioreactor zone. Guided by the baffle plate, the gas flows upwards into the packing layer of the first desulfurization bioreactor zone for desulfurization, then flows out from the top of the packing layer, passes through the gas guide plate, enters the top of the first denitrification bioreactor zone, and flows downwards into the packing layer for denitrification. It then flows out from the bottom of the packing layer, passes through the gas guide plate, enters the bottom of the second desulfurization bioreactor zone, and again flows upwards into the packing layer for secondary desulfurization. Finally, it flows back into the second denitrification bioreactor zone for secondary denitrification, and exits from the air outlet at the lower right side wall of the second denitrification bioreactor zone. The waste gas flows in a loop within each bioreactor zone of the system, as shown in the diagram. Figure 1 Through the gas flow control and multi-level design of independent dual-functional bacterial zones in this invention, the contact area of ​​the gas-liquid-microorganism three phases is increased within a limited volume, and the phenomenon of local gas short circuit is effectively avoided, ensuring full contact between the waste gas and the biological packing material. At the same time, the effective residence time of the waste gas in the biological reaction zone is increased by about 8 seconds, which can significantly improve the desulfurization and denitrification efficiency and achieve excellent deodorization effect.

[0058] When the inlet exhaust gas contains 100 ppm hydrogen sulfide, 160 ppm ammonia, and approximately 15 ppm methanethiol, after treatment by this system, the outlet hydrogen sulfide concentration is below 0.5 ppm, the ammonia concentration is below 1.0 ppm, and the methanethiol concentration is below 0.001 ppm. The removal rate for each pollutant exceeds 98.5%, with the removal rates for hydrogen sulfide and methanethiol reaching over 99.5%. The treated gas indicators are superior to the requirements of the "Odor Pollutant Emission Standard" (GB14554-93).

[0059] Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-stage biological deodorization system with dual-strain zones, characterized in that: It includes N circulating units formed by sequentially arranging desulfurization and denitrification bioreactor zones according to the airflow direction, where N≥1; the desulfurization bioreactor zone includes a biological packing layer I, desulfurization bacteria and nutrient solution I, and the denitrification bioreactor zone includes a biological packing layer II, denitrification bacteria and nutrient solution II; wherein, biological packing layer I and biological packing layer II are respectively located in the middle of the desulfurization bioreactor zone and the denitrification bioreactor zone, with a volume ratio of 1:2; According to the airflow direction, the exhaust gas enters from the bottom of the desulfurization bioreactor zone of the first circulation unit, passes through the biological packing layer I from the bottom to the top, and then enters the denitrification bioreactor zone of the first circulation unit from the top. After passing through the biological packing layer II from the top to the bottom, it is discharged from the bottom, or enters the next circulation unit from the bottom and flows according to the gas flow pattern of the first circulation unit. The exhaust gas flows back and forth in the system.

2. The dual-strain multi-stage biological deodorization system according to claim 1, characterized in that: The N=2 or 3.

3. A dual-strain multi-stage biological deodorization system according to claim 1 or 2, characterized in that: The desulfurization bacteria include at least one of the following: Thiobacillus thiooxidans, Thiobacillus thiopureum, Microfibrillariae, Pseudomonas putidae, and Pseudomonas schrenckii. The initial inoculation of the desulfurizing bacteria strain shall have a total viable bacterial count of not less than 1×10⁻⁶. 10 CFU / g.

4. A multi-stage biological deodorization system with dual-strain zones according to claim 1 or 2, characterized in that: The filler material in the biological filler layer I includes igneous rock, carbon materials and limestone; The temperature of the biological packing layer I is 25~35℃, the pH is 5~7, and the humidity is 60~70%. The nutrient solution I includes thiosulfate, alkali metal phosphate, magnesium salt, alkali metal bicarbonate, ferrous salt and zinc salt.

5. The dual-strain multi-stage biological deodorization system according to claim 4, characterized in that: The mass ratio of the igneous rock, carbonaceous material, and limestone is (2.5~3.5):(0.8~1.5):(0.8~1.5); The concentration of the thiosulfate is 10.0~20.0 g / L; The concentration of alkali metal phosphates is 1.0~2.0 g / L; The concentration of magnesium salts is 0.2~0.5 g / L; The concentration of alkali metal bicarbonates is 1.0~3.0 g / L; The concentration of ferrous salts is 0.05~0.1 g / L; The concentration of zinc salt is 0.01~0.05 g / L.

6. A multi-stage biological deodorization system with dual-strain zones according to claim 1 or 2, characterized in that: The denitrifying bacteria include at least one of nitrifying bacteria, nitrosomonas, denitrifying pseudomonas, paracocci, and amine-eating pseudomonas; The initial inoculation of the denitrifying bacteria strain shall have a total viable bacterial count of not less than 1×10⁻⁶. 10 CFU / g.

7. A dual-strain multi-stage biological deodorization system according to claim 1 or 2, characterized in that: The filler material in the biological filler layer II includes igneous rock and carbon materials; The temperature of the biological packing layer II is 25~35℃, the pH is 6~8, and the humidity is 50~65%. The nutrient solution II includes an organic carbon source, cellulose, alkali metal phosphates, and calcium salts.

8. The dual-strain multi-stage biological deodorization system according to claim 7, characterized in that: The mass ratio of the igneous rock to the carbonaceous material is 2.5~3.5:0.8~1.5; The concentration of the organic carbon source is 5~10 g / L; The concentration of cellulose is 2~5 g / L; The concentration of alkali metal phosphates is 1.0~2.0 g / L; The concentration of calcium salts is 1.0~2.0 g / L.

9. The dual-strain multi-stage biological deodorization system according to claim 1, characterized in that: The first circulation unit has an air inlet at the bottom of the desulfurization bioreactor zone, and the last circulation unit has an air outlet at the bottom of the denitrification bioreactor zone. Both the air inlet and the air outlet are equipped with gas guiding devices. The top of the desulfurization bioreactor zone and the denitrification bioreactor zone in each circulation unit are equipped with spray devices, and the bottom of each is equipped with a liquid collection device.

10. A dual-strain multi-stage biological deodorization system according to claim 1 or 9, characterized in that: The desulfurization bioreactor zone and the denitrification bioreactor zone are connected by a gas flow guiding device.

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