A biological filtration device filled with breathing filler

Abstract

The present invention provides a biological filtration device filled with breathing fillers, including an air intake mechanism, a temperature regulating mechanism, a spray mechanism and a biological filtration tower. The biological filtration device of the present invention constructs a biological filtration tower with a "breathing" filler layer by filling hydrogel materials. The characteristics of the hydrogel material that expands when absorbing water and shrinks when losing water can be used to control the structure of the filler layer by adjusting the spray volume and the airflow temperature. Constructing the filler layer with "breathing" hydrogel materials can break through the key limitations of traditional biological filtration technology and avoid the problem of blockage, slugging, increased pressure drop and fluctuations and significant decreases in removal effect caused by the gradual compaction of the filler layer during the long-term operation of the biological filtration tower. Therefore, compared with traditional biological filtration towers, biological filtration towers filled with "breathing" hydrogel materials have better advantages.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental governance, and in particular relates to a biological filtering device filled with breathing filler. Background Art

[0002] Compared with other traditional technologies (such as activated carbon adsorption, catalytic oxidation and membrane absorption), biofiltration towers for purifying VOCs have the advantages of mature technology, simple equipment, low operating costs and environmental friendliness. Therefore, they are widely used in the treatment of VOCs in various fields.

[0003] The biological filter tower uses microorganisms to degrade VOCs into carbon dioxide and water, or convert them into less harmful substances. The packing layer of the biological filter tower is the only place for microorganisms to attach, and the structural characteristics of the packing layer can directly affect the treatment effect. During the long-term operation of the biological filter tower, the height of the packing layer gradually decreases due to the influence of gravity and spraying, resulting in packing layer compaction, blockage or slugging, which in turn increases the gas-liquid mass transfer resistance of VOCs in the tower, and the treatment effect of the biological filter tower is not ideal. Summary of the invention

[0004] In view of this, the present invention aims to provide a biological filtration device filled with breathing filler to solve the above-mentioned problem.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A biological filtration device filled with a breathing filler comprises an air intake mechanism, a temperature regulating mechanism, a spraying mechanism and a biological filtration tower.

[0007] The air intake mechanism is connected to the air intake hole at the bottom of the biological filtration tower.

[0008] The water outlet of the spray mechanism is connected to the water inlet at the top of the biological filter tower, and the water inlet of the spray mechanism is connected to the water outlet at the bottom of the biological filter tower. The temperature regulating mechanism is used to adjust the temperature of the gas entering the biological filter tower.

[0009] The biological filtration tower is filled with a packing layer, and the packing layer comprises a supporting layer and a hydrogel layer from bottom to top.

[0010] Preferably, the spray mechanism includes a spray liquid tank, a spray pump and a time controller electrically connected to the spray pump, the two ends of the spray pump are respectively connected to the water outlet of the spray liquid tank and the water inlet at the top of the biological filter tower, and the water outlet at the bottom of the biological filter tower is connected to the water inlet of the spray liquid tank through a pipe.

[0011] Preferably, the air intake mechanism includes a VOCs generator, an air compressor, a flow meter and a heater arranged between the air compressor and the flow meter, the heater is used to heat the gas delivered by the air compressor, the air outlets of the heater and the VOCs generator are respectively connected to the air inlet of the flow meter through pipes, and the air outlet of the flow meter is connected to the air inlet hole at the bottom of the biological filtration tower.

[0012] Preferably, the temperature adjustment mechanism includes a temperature sensor disposed in the heater, and the temperature sensor is electrically connected to the heater.

[0013] Preferably, partitions are installed in the biofiltration tower above the air inlet and above the air outlet, circular holes are evenly opened on the partitions, and the supporting layer is installed on the lower partition.

[0014] Preferably, the material of the supporting layer is gravel.

[0015] Preferably, microorganisms for degrading VOCs are attached to the surface of the hydrogel layer.

[0016] Compared with the prior art, the biological filtration device of the present invention has the following advantages:

[0017] The biofiltration device described in the present invention constructs a biofiltration tower with a "breathing" packing layer by filling it with hydrogel materials. By utilizing the characteristics of the hydrogel material that it expands when it absorbs water and shrinks when it loses water, the structure of the packing layer can be controlled by adjusting the spray volume and the airflow temperature. Constructing the packing layer with "breathing" hydrogel materials can break through the key limitations of traditional biofiltration technology and avoid the problem of blockage, slugging, increased pressure drop, and fluctuations and significant decreases in removal effect caused by the gradual compaction of the packing layer during the long-term operation of the biofiltration tower. Therefore, compared with traditional biofiltration towers, biofiltration towers filled with "breathing" hydrogel materials have better advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of the connection structure of the biological filtration device according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of a biofiltration tower when the hydrogel layer according to an embodiment of the present invention shrinks;

[0021] Figure 3 It is a schematic diagram of a biofiltration tower when the hydrogel layer according to an embodiment of the present invention is expanded;

[0022] Figure 4 It is a schematic structural diagram of the partition described in an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Biofiltration tower; 2. Packing layer; 3. Hydrogel layer; 4. Spray liquid tank; 5. Spray pump; 6. Time controller; 7. VOCs generator; 8. Air compressor; 9. Flow meter; 10. Heater; 11. Partition; 12. Support layer; DETAILED DESCRIPTION

[0025] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods, unless otherwise specified, are all conventional methods.

[0026] The present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0027] A biological filtration device filled with a breathing filler comprises an air intake mechanism, a temperature regulating mechanism, a spray mechanism and a biological filtration tower 1, wherein the air intake mechanism is connected to an air intake hole at the bottom of the biological filtration tower 1.

[0028] The water outlet of the spray mechanism is connected to the water inlet at the top of the biological filter tower 1, and the water inlet of the spray mechanism is connected to the water outlet at the bottom of the biological filter tower 1. The temperature regulating mechanism is used to adjust the temperature of the gas entering the biological filter tower 1.

[0029] The biological filtration tower 1 is filled with a packing layer 2, and the packing layer 2 includes a supporting layer 12 and a hydrogel layer 3 from bottom to top.

[0030] Preferably, the spray mechanism includes a spray liquid tank 4, a spray pump 5 and a time controller 6 electrically connected to the spray pump 5, the two ends of the spray pump 5 are respectively connected to the water outlet of the spray liquid tank 4 and the water inlet at the top of the biological filter tower 1, the water outlet at the bottom of the biological filter tower 1 is connected to the water inlet of the spray liquid tank 4 through a pipeline, the time controller 6 controls the working time of the spray pump 5, and is used to regularly and quantitatively add spray liquid from the top of the biological filter tower 1, and the water outlet at the bottom of the biological filter tower 1 flows the spray liquid back to the spray liquid tank 4 through a silicone tube, and the silicone tube is placed below the liquid level of the biological filter tower 1.

[0031] Preferably, the air intake mechanism includes a VOCs generator 7, an air compressor 8, a flow meter 9 and a heater 10 arranged between the air compressor 8 and the flow meter 9. The heater 10 is used to heat the gas delivered by the air compressor 8. The air outlets of the heater 10 and the VOCs generator 7 are respectively connected to the air inlet of the flow meter 9 through pipelines. The air outlet of the flow meter 9 is connected to the air inlet hole at the bottom of the biological filter tower 1. The gas heated by the heater 10 is mixed with the VOCs generated by the VOCs generator 7 and enters the biological filter tower 1 through the flow meter 9 together.

[0032] Preferably, the temperature control mechanism includes a temperature sensor provided in the heater 10, and the temperature sensor and the heater 10 are respectively electrically connected to a pin of the single-chip microcomputer. When the gas temperature in the heater 10 is lower than the set value, the temperature sensor senses the gas temperature, sends a signal to the single-chip microcomputer, triggers the heater 10 to start, and heats the gas in the heater 10 until the set temperature is reached.

[0033] Preferably, a partition 11 is installed in the biofiltration tower 1 above the air inlet and the air outlet, and circular holes are evenly opened on the partition 11. The supporting layer 12 is installed on the lower partition 11. Preferably, microorganisms for degrading VOCs are attached to the surface of the hydrogel layer 3.

[0034] like Figure 1-4 As shown, the design parameters of the biological filter tower 1 are a cylindrical reactor with a height of 60 cm, an inner diameter of 6 cm, and a wall thickness of 1 cm, and the material is organic glass. Two perforated disc-shaped partitions 11 (aperture 0.2 cm) are set 10 cm from the bottom and the top. Among them, the bottom partition 11 is used to support the packing layer 2 in the biological filter tower 1, and the top partition 11 is used to evenly rinse the packing layer 2 with the spray liquid added to the biological filter tower 1. The packing layer 2 is constructed by packing gravel and hydrogel in a traditional random pile manner. Among them, the gravel filled in the lower layer of the packing layer 2 is used as a supporting layer 12, with a particle size of 0.5-1 cm and a stacking height of 5 cm; the upper layer of the packing layer 2 is filled with a hydrogel filler with attached biofilm, with a particle size of 0.2-1 cm and an initial stacking height of 5 cm. The flow rate of the spray pump 5 is 2.86 mL / s, the spray time is 5 min, and the spray volume is 858 mL. The working cycle of the spray pump 5 is controlled by the time controller 6. The target VOCs selected methanol, the gas flow rate was 0.1m3 / h, and the inlet concentration was 800mg / m3.

[0035] Example 1: When the inlet temperature is 20°C and the spraying cycle is 5min / 24h, the hydrogel filler does not expand significantly due to the small spraying volume (such as the attached Figure 3 As shown). The height of the packing layer 2 is only increased from 10 cm to 12 cm, while the inlet air temperature is adjusted to 30°C, and the height of the packing layer 2 is reduced from 12 cm to 11 cm.

[0036] Example 2: When the inlet air temperature is 20°C and the spraying cycle is adjusted to 5min / 8h, the hydrogel filler expands significantly (such as the attached Figure 4 As shown). The height of the packing layer 2 can be increased to 28 cm, and when the inlet air temperature is adjusted to 30°C, the height of the packing layer 2 is reduced from 28 cm to 26 cm.

[0037] Example 3: The inlet temperature is 20°C, the spray cycle is 5min / 24h, the gas residence time is 12s, and the methanol removal rate measured at the outlet is in the range of 30-40%.

[0038] Example 4: The inlet temperature is 30°C, the spray cycle is 5min / 24h, the gas residence time is 11s, and the methanol removal rate measured at the outlet is in the range of 30-50%.

[0039] Example 5: The inlet temperature is 20°C, the spray cycle is 5min / 8h, the gas residence time is 28s, and the methanol removal rate measured at the outlet is 80-90%.

[0040] Example 6: The inlet temperature is 30°C, the spray cycle is 5min / 8h, the gas residence time is 26s, and the methanol removal rate measured at the outlet is 80-90%.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A biological filtration device filled with a breathing filler, characterized in that: It includes air intake mechanism, temperature adjustment mechanism, spray mechanism and biological filtration tower. The air intake mechanism is connected to the air intake hole at the bottom of the biological filtration tower. The water outlet of the spray mechanism is connected to the water inlet at the top of the biological filter tower, and the water inlet of the spray mechanism is connected to the water outlet at the bottom of the biological filter tower. The temperature regulating mechanism is used to adjust the temperature of the gas entering the biological filter tower. The biological filter tower is filled with a packing layer, which includes a supporting layer and a hydrogel layer from bottom to top; microorganisms for degrading VOCs are attached to the surface of the hydrogel layer; the characteristics of the hydrogel material that expands when absorbing water and shrinks when losing water are utilized to control the structure of the packing layer by adjusting the spraying volume and the air flow temperature; the packing layer is gradually compacted during the operation of the biological filter tower, thereby avoiding blockage, slugging, increased pressure drop, and fluctuations and decreases in removal effect; the material of the supporting layer is gravel.

2. The biological filtration device filled with breathing filler according to claim 1, characterized in that: The spray mechanism includes a spray liquid tank, a spray pump and a time controller electrically connected to the spray pump. The two ends of the spray pump are respectively connected to the water outlet of the spray liquid tank and the water inlet at the top of the biological filter tower. The water outlet at the bottom of the biological filter tower is connected to the water inlet of the spray liquid tank through a pipeline.

3. The biological filtration device filled with breathing filler according to claim 1, characterized in that: The air intake mechanism includes a VOCs generator, an air compressor, a flow meter and a heater arranged between the air compressor and the flow meter. The heater is used to heat the gas delivered by the air compressor. The air outlets of the heater and the VOCs generator are respectively connected to the air inlet of the flow meter through pipelines. The air outlet of the flow meter is connected to the air inlet hole at the bottom of the biological filtration tower.

4. The biological filtration device filled with breathing filler according to claim 1, characterized in that: The temperature adjustment mechanism includes a temperature sensor disposed in the heater, and the temperature sensor is electrically connected to the heater.

5. The biological filtration device filled with breathing filler according to claim 1, characterized in that: Partitions are arranged above the air inlet and the air outlet in the biological filtering tower. Round holes are evenly opened on the partitions. The supporting layer is arranged on the lower partitions.

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