Adsorption regeneration non-condensable tail gas biological reduction system

Abstract

The utility model relates to the technical field of waste gas treatment, and discloses an adsorption regeneration non-condensable tail gas biological reduction system which comprises a biological compatibilization reactor, an oxygenation fan, a biological agent adding tank and a circulating water pump, a filter material layer is arranged in the biological compatibilization reactor, and microbial flora is loaded on the surface of the filter material layer; and the oxygenation fan is connected to the bottom of the biological compatibilization reactor through a pipeline. According to the utility model, the reduction of non-condensable tail gas organic pollutants in the adsorption regeneration process is realized through the matching of the biological compatibilization reactor, the oxygenation fan, the biological agent adding tank and the circulating water pump, the organic pollutants are degraded by utilizing microorganisms, the final products are carbon dioxide and water, other secondary pollution is avoided, combustion treatment processes such as high temperature and flame are not involved, and the environmental pollution is avoided. Therefore, the practicability, the reliability and the safety are taken into consideration, and meanwhile, the problem of non-condensable tail gas treatment in an adsorption regeneration process is solved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to an adsorption-regeneration non-condensable tail gas biological reduction system. Background Technology

[0002] Adsorption regeneration is a common process in VOCs waste gas treatment. Its principle is that when waste gas containing organic pollutants passes through a porous filter layer, pollutant molecules enter the pore structure of the adsorbent through diffusion. Due to the van der Waals forces (intermolecular forces) between the molecules and the pore walls, the pollutant molecules are adsorbed on the pore surface, thereby separating from the airflow.

[0003] Saturated filter media can be desorbed by weakening the interaction between pollutant molecules and the adsorbent through methods such as steam regeneration, hot gas regeneration, and vacuum desorption. The desorbed gas contains a large amount of pollutants. After condensation, some pollutants are discharged in liquid form, while others remain in gaseous form. This type of gas, which cannot be condensed, recovered, or disposed of, is called "non-condensable tail gas".

[0004] Non-condensable exhaust gas is a gas containing high concentrations of organic pollutants. Due to its high concentration and intermittent nature, non-condensable exhaust gas has always been a difficult point to treat in adsorption regeneration processes. Conventional processes require combustion to further purify non-condensable exhaust gas. However, due to the limitations of combustion-based waste gas treatment technology, such as significant changes in gas volume and pollutant concentration, the combustion-based waste gas treatment system can be negatively affected. This makes the use of combustion for non-condensable exhaust gas treatment not feasible and poses safety hazards. Therefore, a practical technology is needed to solve the treatment of non-condensable exhaust gas in adsorption regeneration processes. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an adsorption-regeneration non-condensable tail gas biological reduction system.

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

[0007] A bio-reduction system for adsorption-regenerated non-condensable tail gas includes a bio-enlargement reactor, an oxygenation fan, a bio-agent dosing tank, and a circulating water pump. The bio-enlargement reactor has a filter media layer inside, and the surface of the filter media layer is loaded with microbial communities. The oxygenation fan is connected to the bottom of the bio-enlargement reactor through a pipeline. The bio-agent dosing tank is located on the top side of the bio-enlargement reactor. The circulating water pump is connected to the inside of the bio-enlargement reactor through a circulation pipeline, and a spray head is also installed at the end of the pipeline.

[0008] The bio-enlargement reactor is equipped with submerged and non-submerged operating zones, and the operating mode can be switched via valves.

[0009] As a further embodiment of this invention, the filter media layer inside the bio-enlargement reactor is composed of bio-affinity filter media with pollutant adsorption capacity, and the filter media layer has a rich porous structure.

[0010] As a further aspect of this invention, by utilizing the operating mechanism of adsorption followed by degradation, the fixation of organic pollutants in waste gas and the separation of biodegradation processes over time are achieved in the treatment technology of waste gas containing organic pollutants.

[0011] As a further embodiment of this utility model, the outlet of the oxygenation fan is provided with a gas distributor, which is located directly below the filter layer.

[0012] As a further embodiment of this invention, the submerged operation mode can improve the treatment of hydrophilic organic pollutants, while the non-submerged operation mode can improve the treatment of hydrophobic organic pollutants, thus expanding the scope of microbial treatment of organic pollutants.

[0013] As a further embodiment of this utility model, the spray head of the circulating water pump is located above the filter media layer, and the spray range of the spray head can cover 90% of the surface area of ​​the filter media layer.

[0014] As a further embodiment of this invention, a backwashing unit is provided at the bottom of the bio-enlargement reactor, the backwashing unit including a backwash water pump and a perforated pipe.

[0015] As a further embodiment of this invention, the perforated tube extends through the bottom side of the bio-enlargement reactor to the bottom of the filter media layer.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In this invention, the reduction of non-condensable tail gas organic pollutants in the adsorption regeneration process is achieved through the combined use of a bio-enlargement reactor, an oxygenation fan, a biological agent dosing tank, and a circulating water pump. The organic pollutants are degraded by microorganisms, and the final products are carbon dioxide and water, with no other secondary pollution. Furthermore, it does not involve high-temperature or flame combustion processes, thus posing no safety risks. This achieves a balance between practicality, reliability, and safety, while simultaneously solving the problem of non-condensable tail gas treatment in the adsorption regeneration process. Attached Figure Description

[0018] Figure 1 The flowchart of the adsorption-regeneration non-condensable tail gas biological reduction system proposed in this utility model is as follows:

[0019] Figure 2 This is a structural plan view of an adsorption-regeneration non-condensable tail gas biological reduction system proposed in this utility model.

[0020] In the diagram: 1. Biomass expansion reactor;

[0021] 2. Aeration fan;

[0022] 3. Biological agent dosing tank;

[0023] 4. Circulating water pump. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Reference Figure 1 A biological reduction system for adsorption-regeneration non-condensable tail gas includes a bio-enlargement reactor 1, an oxygenation fan 2, a biological agent dosing tank 3, and a circulating water pump 4. The bio-enlargement reactor 1 has a filter layer inside, and the surface of the filter layer is loaded with microbial communities. The oxygenation fan 2 is connected to the bottom of the bio-enlargement reactor 1 through a pipe. The biological agent dosing tank 3 is located on the top side of the bio-enlargement reactor 1. The circulating water pump 4 is connected to the inside of the bio-enlargement reactor 1 through a circulation pipeline, and a spray head is also installed at the end of the pipeline.

[0028] The bio-enlargement reactor 1 is equipped with a submerged operation zone and a non-submerged operation zone. The operation mode can be switched by valves. The submerged operation mode can improve the treatment of hydrophilic organic pollutants, while the non-submerged operation mode can improve the treatment of hydrophobic organic pollutants, thus expanding the scope of microbial treatment of organic pollutants.

[0029] In this embodiment, the filter layer inside the bio-enlargement reactor 1 is composed of bio-affinity filter material with pollutant adsorption capacity, and the filter layer has a rich porous structure. The filter layer has a rich porous structure, which can adsorb and capture pollutants, and at the same time provide a place for microorganisms to degrade pollutants. By utilizing the operating mechanism of adsorption followed by degradation, in the treatment technology of waste gas containing organic pollutants, the fixation of organic pollutants in waste gas and the biodegradation process are separated in time. Compared with the bacterial liquid containing microorganisms, the fixation capacity of the bio-enlargement reactor 1 for organic pollutants can be increased by several times to tens of times.

[0030] In this embodiment, the outlet of the oxygenation fan 2 is equipped with a gas distributor, which is located directly below the filter layer. The oxygenation fan 2 provides oxygen for the microbial activity in the reactor and provides oxygen in stages according to the total amount of pollutants in the reactor.

[0031] In this embodiment, the spray head of the circulating water pump 4 is located above the filter media layer, and the spray range of the spray head can cover 90% of the surface area of ​​the filter media layer. The circulating water pump 4 is used to achieve humidification of the filter media or homogenization of the bacterial solution in the bio-enlargement reactor 1.

[0032] In this embodiment, a backwashing unit is provided at the bottom of the bio-enlargement reactor 1. The backwashing unit includes a backwash water pump and a perforated pipe. The perforated pipe penetrates the bottom side of the bio-enlargement reactor 1 and extends to the bottom of the filter media layer. The backwash water pump draws backwash water to wash the filter media layer, which can peel off the thick biofilm layer on the surface of the filter media, restore the adsorption capacity of the filter media layer, and wait for the next non-condensable tail gas to enter.

[0033] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: When in use, the intermittent non-condensable exhaust gas is discharged into the bio-enlargement reactor 1. The bio-enlargement reactor 1 is equipped with filter media with pollutant adsorption capacity. The filter media is covered with a large number of microorganisms. The bio-filter media layer can quickly adsorb volatile organic pollutants in the non-condensable exhaust gas, thereby achieving the fixation of volatile organic pollutants in the filter media layer.

[0034] When volatile organic pollutants are degraded by submersion: the microbial-rich bacterial solution submerges the filter media in the bio-enlargement reactor 1, and then air is blown under the filter media by the oxygenation fan 2 to continuously replenish oxygen to the circulating liquid. Then, the circulating water pump 4 is used to stabilize various indicators such as microbial biomass, oxygen, and temperature in the bio-enlargement reactor 1, avoiding adverse factors such as local anaerobic environment. In the oxygen-rich environment, microorganisms use VOCs pollutants as nutrients to biochemically degrade pollutants in the filter media layer, thereby removing pollutants.

[0035] When volatile organic pollutants are degraded through non-immersion: the filter media is not immersed in the bacterial solution, and the bacterial solution rich in microorganisms is located in the water storage area at the bottom of the bio-enlargement reactor 1. The bacterial solution continuously washes the filter media through the circulating spray of the circulating water pump 4. Then, the oxygenation fan 2 introduces air and the spray liquid flows counter-currently to the filter media layer, so as to continuously replenish oxygen to the circulating liquid. In the oxygen-rich environment, microorganisms use VOCs pollutants as nutrients to biochemically degrade the pollutants in the filter media layer, thereby removing the pollutants.

[0036] Once the pollutants have been removed, a backwash water pump is used to extract backwash water to rinse the filter media layer, causing the thicker biofilm layer on the surface of the filter media to peel off, restoring the filter media layer's adsorption capacity, and preparing it for the next non-condensable exhaust gas to enter.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A biological reduction system for adsorption-regeneration non-condensable tail gas, characterized in that, The system includes a bio-enlargement reactor (1), an oxygenation fan (2), a biological agent dosing tank (3), and a circulating water pump (4). The bio-enlargement reactor (1) has a filter layer inside, and the surface of the filter layer is loaded with microbial communities. The oxygenation fan (2) is connected to the bottom of the bio-enlargement reactor (1) through a pipe. The biological agent dosing tank (3) is located on the top side of the bio-enlargement reactor (1). The circulating water pump (4) is connected to the inside of the bio-enlargement reactor (1) through a circulating pipeline, and a spray head is also provided at the end of the pipeline. The bio-enlargement reactor (1) is equipped with submerged and non-submerged operation modes, and the operation mode can be switched by valves.

2. The adsorption-regeneration non-condensable tail gas biological reduction system according to claim 1, characterized in that, The filter layer inside the bio-enlargement reactor (1) is composed of bio-affinity filter material with pollutant adsorption capacity, and the filter layer has a rich porous structure. By utilizing the operating mechanism of adsorption followed by degradation, the fixation of organic pollutants in the waste gas and the separation of biodegradation process in time are realized in the waste gas treatment technology containing organic pollutants.

3. The adsorption-regeneration non-condensable tail gas biological reduction system according to claim 1, characterized in that, The outlet of the oxygenation fan (2) is equipped with a gas distributor, which is located directly below the filter layer.

4. The adsorption-regeneration non-condensable tail gas biological reduction system according to claim 1, characterized in that, The spray head of the circulating water pump (4) is located above the filter material layer, and the spray range of the spray head can cover 90% of the surface area of ​​the filter material layer.

5. The adsorption-regeneration non-condensable tail gas biological reduction system according to claim 1, characterized in that, The bottom of the bio-enlargement reactor (1) is provided with a backwashing unit, which includes a backwash water pump and a perforated pipe.

6. The adsorption-regeneration non-condensable tail gas biological reduction system according to claim 5, characterized in that, The perforated tube penetrates the bottom side of the bio-enlargement reactor (1) and extends to the bottom of the filter layer.

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