Adsorption regeneration non-condensable tail gas biological reduction system

Abstract

The invention 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 the surface of the filter material layer is loaded with microbial flora; and the oxygenation fan is connected to the bottom of the biological compatibilization reactor through a pipeline. Through cooperation of the biological compatibilization reactor, the oxygenation fan, the biological agent adding tank and the circulating water pump, reduction of non-condensable tail gas organic pollutants in the adsorption regeneration process is achieved, the organic pollutants are degraded through microorganisms, final products are carbon dioxide and water, other secondary pollution is avoided, combustion treatment processes of high temperature, flame and the like are not involved, and 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] The present invention relates to the technical field of waste gas treatment, and in particular to an adsorption regeneration non-condensable tail gas biological reduction system. Background Art

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

[0003] Saturated filter media is regenerated through steam, hot air, or vacuum desorption to weaken the forces between pollutant molecules and the adsorbent, allowing the pollutants to be desorbed. The desorbed gas contains a large amount of pollutants. Typically, after condensation, some pollutants are discharged as liquids, 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 tail gas is a gas containing high concentrations of organic pollutants. Due to its high concentration and intermittent characteristics, non-condensable tail gas has always been a difficult point to treat in the adsorption regeneration process. Conventional processes require the use of combustion methods to further purify non-condensable tail gas. However, due to the limitations of combustion waste gas treatment technology, such as large-scale changes in gas volume and changes in pollutant concentration, they will have a negative impact on the combustion waste gas treatment system, resulting in low feasibility of using combustion methods to treat non-condensable tail gas and potential safety hazards. Therefore, a practical technology is needed to solve the problem of treating non-condensable tail gas in the adsorption regeneration process. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an adsorption regeneration non-condensable tail gas biological reduction system.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An adsorption regeneration non-condensable tail gas bioreduction system includes a bio-capacitance reactor, an aeration fan, a bio-microbial agent feeding tank, and a circulating water pump. The bio-capacitance reactor is provided with a filter material layer inside, and the surface of the filter material layer is loaded with microbial flora. The aeration fan is connected to the bottom of the bio-capacitance reactor via a pipeline, the bio-microbial agent feeding tank is provided on the top side of the bio-capacitance reactor, and the circulating water pump is connected to the interior of the bio-capacitance reactor via a circulation pipeline, and a spray head is also provided at the end of the pipeline.

[0008] The biocapacitance expansion reactor is provided with an immersed operation area and a non-immersed operation area, and the operation mode can be switched by a valve.

[0009] As a further solution of the present invention, the filter material layer inside the biocapacitance reactor is composed of a bio-affinity filter material with pollutant adsorption capacity, and the filter material layer has a rich porous structure.

[0010] As a further solution of the present invention, the operating mechanism of first adsorption and then degradation is utilized to achieve the temporal separation of the fixation of organic pollutants in the waste gas and the biodegradation process in the waste gas in the waste gas treatment technology containing organic pollutants.

[0011] As a further solution of the present invention, a gas distributor is provided at the outlet of the oxygen enrichment blower, and the distributor is located directly below the filter material layer.

[0012] As a further solution of the present invention, the submerged operation mode can improve the treatment of hydrophilic organic pollutants, and the non-submerged operation mode can improve the treatment of hydrophobic organic pollutants, thereby expanding the scope of microbial treatment of organic pollutants.

[0013] As a further solution of the present invention, the spray head of the circulating water pump is arranged 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.

[0014] As a further solution of the present invention, a backwash unit is provided at the bottom of the biocapacitance expansion reactor, and the backwash unit includes a backwash water pump and a perforated pipe.

[0015] As a further solution of the present invention, the perforated pipe penetrates the bottom side of the biocapacitance reactor and extends to the bottom of the filter material layer.

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

[0017] In the present invention, the reduction of non-condensable tail gas organic pollutants in the adsorption regeneration process is achieved through the cooperation of a biological capacity expansion reactor, an oxygenation fan, a biological agent addition tank, and a circulating water pump. Microorganisms are used to degrade organic pollutants, and the final products are carbon dioxide and water. There is no other secondary pollution, and no high-temperature, flame or other combustion treatment processes are involved, so there is no safety risk. Therefore, practicality, reliability, and safety are taken into account, and the problem of non-condensable tail gas treatment in the adsorption regeneration process is solved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of an adsorption regeneration non-condensable tail gas biological reduction system proposed by the present invention;

[0019] Figure 2 This is a structural plan view of an adsorption regeneration non-condensable tail gas biological reduction system proposed by the present invention.

[0020] In the figure: 1. Bio-enlargement reactor;

[0021] 2. Oxygen enrichment fan;

[0022] 3. Biological agent addition tank;

[0023] 4. Circulating water pump. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, 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 the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] Reference Figure 1 A system for bioreduction of non-condensable tail gas by adsorption regeneration includes a bio-capacitance reactor 1, an aeration fan 2, a bio-microbial agent dosing tank 3, and a circulating water pump 4. A filter material layer is provided inside the bio-capacitance reactor 1, and a microbial flora is loaded on the surface of the filter material layer. The aeration fan 2 is connected to the bottom of the bio-capacitance reactor 1 through a pipeline. The bio-microbial agent dosing tank 3 is provided on the top side of the bio-capacitance reactor 1. The circulating water pump 4 is connected to the interior of the bio-capacitance reactor 1 through a circulation pipeline, and a spray head is also provided at the end of the pipeline.

[0028] The biocapacitator reactor 1 is provided with an immersed operation area and a non-immersed operation area, and the operation mode can be switched by a valve. The immersed operation mode can improve the treatment of hydrophilic organic pollutants, and the non-immersed operation mode can improve the treatment of hydrophobic organic pollutants, thereby expanding the scope of microbial treatment of organic pollutants.

[0029] In this embodiment, the filter material layer inside the biocapacitance reactor 1 is composed of a bio-affinity filter material with pollutant adsorption capacity, and the filter material layer has a rich porous structure. The filter material 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 first adsorption and then degradation, in the waste gas treatment technology containing organic pollutants, the temporal separation of the fixation of organic pollutants in the waste gas and the biodegradation process is achieved. Compared with the general bacterial solution containing microorganisms, the fixation capacity of the biocapacitance reactor 1 for organic pollutants can be increased by several times to dozens of times.

[0030] In this embodiment, a gas distributor is provided at the outlet of the oxygenating fan 2, and the distributor is located just below the filter material layer. The oxygenating 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 arranged 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. The circulating water pump 4 is used to achieve filter material humidification or bacterial liquid homogenization in the biocapacitance reactor 1.

[0032] In this embodiment, a backwash unit is provided at the bottom of the biocapacitance reactor 1. The backwash unit includes a backwash water pump and a perforated pipe. The perforated pipe penetrates the bottom side of the biocapacitance reactor 1 and extends to the bottom of the filter material layer. The backwash water pump is used to extract backwash water to flush the filter material layer, which can peel off the thicker biofilm layer on the surface of the filter material, restore the adsorption capacity of the filter material layer, and wait for the next non-condensable exhaust gas to enter.

[0033] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: when in use, intermittent non-condensable tail gas is discharged into the bio-capacitance reactor 1. Through the filter material with pollutant adsorption capacity provided in the bio-capacitance reactor 1 and a large number of microorganisms attached to the filter material, the biological filter material layer can quickly adsorb volatile organic pollutants in the non-condensable tail gas, thereby achieving the fixation of volatile organic pollutants in the filter material layer;

[0034] When volatile organic pollutants are degraded by immersion: the bacterial liquid rich in microorganisms will immerse the filter material in the bio-capacitance reactor 1, and then air will be blown into the bottom of the filter material through the oxygen enrichment fan 2 to continuously replenish oxygen for 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-capacitance reactor 1, avoiding adverse factors such as local anaerobic environment. In the oxygen-rich environment, microorganisms use VOCs pollutants as nutrients in the filter material layer to biochemically degrade pollutants, thereby achieving pollutant removal;

[0035] When volatile organic pollutants are degraded by non-immersion: the filter material is not immersed in the bacterial solution, and the bacterial solution rich in microorganisms will be located in the water storage area at the bottom of the bio-capacitance expansion reactor 1. The circulating spraying of the circulating water pump 4 can continuously rinse the filter material with the bacterial solution. Then, the air added by the oxygenating fan 2 and the spraying liquid flow in the filter material layer in a countercurrent manner, thereby achieving the effect of continuously replenishing oxygen for the circulating liquid. In the oxygen-rich environment, the microorganisms in the filter material layer use VOCs pollutants as nutrients to biochemically degrade the pollutants, thereby achieving the removal of pollutants.

[0036] When the pollutants are removed, the backwash water is pumped out by the backwash pump to flush the filter layer to peel off the thicker biofilm layer on the filter surface, so that the filter layer can restore its adsorption capacity and wait for the next non-condensable exhaust gas to enter.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements all fall within the scope of the invention claimed for protection.

Claims

1. A system for bioreduction of non-condensable tail gas by adsorption regeneration, comprising a bio-capacitance reactor (1), an aeration blower (2), a bio-microbial agent dosing tank (3), and a circulating water pump (4); a filter material layer is provided inside the bio-capacitance reactor (1); a microbial flora is loaded on the surface of the filter material layer; the aeration blower (2) is connected to the bottom of the bio-capacitance reactor (1) through a pipeline; the bio-microbial agent dosing tank (3) is provided on the top side of the bio-capacitance reactor (1); the circulating water pump (4) is connected to the interior of the bio-capacitance reactor (1) through a circulation pipeline; and a spray head is further provided at the end of the pipeline; The biocapacitating reactor (1) is provided with submerged operation and non-submerged operation, and the operation mode can be switched by a valve.

2. The adsorption regeneration non-condensable tail gas bioreduction system according to claim 1, characterized in that: The filter material layer inside the biocapacitance reactor (1) is composed of a bio-affinity filter material with pollutant adsorption capacity, and the filter material layer has a rich porous structure. By utilizing the operating mechanism of first adsorption and then degradation, in the waste gas treatment technology containing organic pollutants, the temporal separation of the fixation of organic pollutants in the waste gas and the biodegradation process is achieved.

3. The adsorption regeneration non-condensable tail gas biological reduction system according to claim 1 is characterized in that: The outlet of the oxygen-enhancing blower (2) is provided with a gas distributor, which is located just below the filter material layer.

4. The adsorption regeneration non-condensable tail gas bioreduction system according to claim 1, characterized in that: The spray head of the circulating water pump (4) is arranged 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 bioreduction system according to claim 1, characterized in that: A backwash unit is provided at the bottom of the biocapacitance reactor (1), and the backwash unit comprises 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 pipe penetrates the bottom side of the biocapacitance reactor (1) and extends to the bottom of the filter material layer.

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