VOCs waste gas on-line biodegradation device

Abstract

The utility model discloses an online biodegradation device for VOCs waste gas. The device comprises a biodegradation treatment system, a gas-water separator and a biological enzyme reaction box which are connected in sequence, the biodegradation treatment system comprises a biodegradation tower, aeration equipment, a biological bacterial liquid circulating system and filler; according to the biodegradation treatment system, VOCs waste gas entering the bottom in a biodegradation tower and running from bottom to top and biological bacteria liquid sprayed from top to bottom in a vaporific manner can be fully contacted and reacted, and the PH value, the temperature and the dissolved oxygen value of the biodegradation tower are automatically controlled through a PLC (Programmable Logic Controller); the gas-water separator comprises a primary water absorption area formed by filter cotton and a deep water absorption area formed by a plurality of inorganic light porous fillers; and a biological enzyme taking activated carbon as a carrier is arranged in the biological enzyme reaction box. The device can continuously degrade and treat VOCs on line, solves the problem that VOCs waste gas is difficult to degrade, is safe and environment-friendly, low in energy consumption and low in cost, and can meet the requirements of continuous production and online VOCs degradation of enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of VOCs waste gas treatment, in particular to an on-line biological degradation device for VOCs waste gas. Background Art

[0002] The waste gas in the painting workshop is mainly the organic solvents contained in the paint and the decomposition products during spraying and drying of the paint film, collectively referred to as volatile organic compounds (VOCs). The main components are benzene, toluene and xylene. These components are harmful to human health and the living environment and have a foul smell. If people inhale low-concentration organic waste gas for a long time, it will cause chronic respiratory diseases such as cough, chest tightness, asthma and even emphysema. This is a well-recognized strong carcinogen at present.

[0003] The main treatment technologies for on-line treatment of VOCs are: regenerative thermal oxidizer (RTO) and regenerative catalytic oxidizer (RCO). RTO has a high one-time investment cost, a high treatment temperature (800 - 1100 °C), high energy consumption, consumes a large amount of natural gas, is not suitable for treating high-concentration organic waste gas, has many moving parts, requires frequent maintenance, and has a high operation and maintenance cost. RCO is only applicable to the treatment of organic waste gas containing low-boiling organic components and low ash content, and is not suitable for the treatment of waste gas containing viscous substances such as oil fume. The treatment temperature is also relatively high (300 - 600 °C), and the core unit catalyst (precious metal) is prone to poisoning and failure. In order to overcome the defects of high energy consumption and easy catalyst poisoning in the treatment of VOCs waste gas by RTO and RCO, low-energy-consuming biological membrane method, photocatalytic decomposition method, ozone decomposition method, biological degradation method, etc. have been developed at present.

[0004] The current biological degradation VOCs processes and devices are mainly for batch treatment processes and devices, that is, first collect the gas, and then fully mix the gas and biological bacteria in a closed space. There is currently no process and device for using biological degradation to continuously treat VOCs on-line. At present, some biological methods for degrading Vocs cannot meet the requirements of painting waste gas treatment. Basically, they only play an auxiliary role with biology, or need to collect the waste gas before treatment, and cannot meet the needs of enterprises for continuous production and on-line degradation of Vocs. For example: the device in Patent 202320759284.7 can only treat a very small air volume. The method and device for treating refractory organic waste gas by combining low-temperature plasma and biology first need to collect the gas and then degrade it; secondly, the plasma equipment requires a high-voltage power supply and has a certain danger; finally, the main functions of the biological trickling filter, filtration tower or washing tower used in this technology are dust removal and deodorization, and cannot play a role in degradation. Content of the Utility Model

[0005] In order to solve the shortcomings of the current online VOCs treatment technology, the purpose of the utility model is to provide a VOCs waste gas online biodegradation device that can continuously degrade and treat VOCs online and meet the needs of enterprises for continuous production and online degradation of VOCs.

[0006] The technical solution of the utility model is as follows:

[0007] A VOCs waste gas online biodegradation device comprises a biodegradation treatment system, a gas-water separator and a bio-enzyme reaction box connected in sequence; the biodegradation treatment system can make the VOCs waste gas entering the bottom of the biodegradation tower and running from bottom to top fully contact and react with the biological bacterial liquid sprayed from top to bottom in a mist form, so as to obtain a first purified gas that degrades and removes most of the VOCs; the gas-water separator can remove moisture and impurities from the first purified gas to obtain a second purified gas; the bio-enzyme reaction box is provided with a bio-enzyme with activated carbon as a carrier, which can decompose and purify the second purified gas through the bio-enzyme to obtain a third purified gas that can meet emission standards.

[0008] Preferably, the biodegradation treatment system comprises a biodegradation tower, an aeration device, a biological bacteria liquid circulation system and a filter material layer; the biodegradation tower is the main tower of the biodegradation system, which is a closed horizontal tower, and the biological bacteria liquid is contained in the tower; the biological bacteria liquid circulation system comprises a circulating water pump and a vertical spray pipe and a spray head connected to its outlet; the circulating water pump is arranged at the bottom of the biodegradation tower, and the spray head is arranged at the top of the biodegradation tower; the aeration device is an oxygen supply fan, which is located outside the biodegradation tower, and its outlet pipe is connected to the bottom of the tower to supply oxygen to the biological bacteria; the filter material layer is filled with porous filter material; waste gas inlet and waste gas outlet are arranged on both sides of the biodegradation tower, the waste gas inlet is located at the top of one side of the tower, and the waste gas outlet is located at the top of the other side of the tower. A vertical air inlet channel is arranged near the exhaust gas inlet in the tower, and the exhaust gas enters the bottom of the tower through the air inlet channel; the rest of the middle and upper space in the tower is divided into multiple reaction chambers by multiple filter material layers arranged in parallel at vertical intervals, and each reaction chamber is equipped with a set of biological bacterial liquid circulation system including a circulating water pump and a vertical spray pipe and a spray head connected to its outlet, and the spray heads are symmetrically arranged at different heights on the spray pipe; in each reaction chamber, the biological bacterial liquid at the bottom of the biodegradation tower passes through the circulating water pump and the vertical spray pipe connected to its outlet to reach the spray head at the top, and is atomized and sprayed from top to bottom, fully contacting and reacting with the exhaust gas running from bottom to top entering the bottom of the tower, and most of the VOCs in the exhaust gas are degraded by biological bacteria; then the exhaust gas absorbs water through the porous filter material of the filter material layer, comes out from the exhaust gas outlet, and enters the gas-water separator for gas-water separation.

[0009] Preferably, in the biodegradation treatment system, the bacterial species in the biological bacterial liquid are one or both of Beyerlinckia LM-W and Brevmonas LM-R.

[0010] Preferably, the biodegradation treatment system further comprises a demister; a wave plate type demister is provided at the exhaust gas outlet of the biodegradation tower.

[0011] Preferably, the biodegradation treatment system also includes a pH value control module, a temperature control module and a dissolved oxygen value control module, and the pH value, temperature and dissolved oxygen value of the biodegradation tower are automatically controlled by a PLC controller; a pH value sensor, a temperature sensor and a dissolved oxygen value sensor are provided in the biodegradation tower; the signal input end of the temperature controller is connected to the temperature sensor, and the signal output end is connected to the electric heater of the biodegradation tower; the signal input end of the pH value controller is connected to the pH value sensor, and the signal output end is connected to the acid and alkali tank; the signal input end of the dissolved oxygen controller is connected to the dissolved oxygen value sensor, and the signal output end is connected to the oxygen supply fan.

[0012] Preferably, the gas-water separator includes a primary water absorption zone composed of filter cotton and a deep water absorption zone composed of multiple inorganic lightweight porous fillers. The first purified gas first passes through the filter cotton to initially remove moisture and impurities, and then passes through multiple inorganic lightweight porous fillers to completely remove moisture and impurities to obtain the second purified gas.

[0013] Preferably, the bio-enzyme reaction boxes are in multiple sets, and the multiple sets of bio-enzyme reaction boxes are installed in parallel.

[0014] Preferably, there are multiple biodegradation treatment systems, and the multiple biodegradation treatment systems are installed in series.

[0015] Preferably, the inorganic lightweight porous filler is an irregular particle with a diameter of 5-50 mm, and the particle has a microporous structure, a porosity of 50% to 90%, and a specific surface area of ​​more than 2 m 2 More preferably, the particle specific gravity is less than or equal to 0.3KG / m 3 The microporous structures are mostly through holes, and the minimum pore size is as fine as micron level.

[0016] The microbial liquid in the biodegradation treatment system can be fully mixed with the VOC waste gas, and the liquid-gas contact time reaches more than 3S. Under the efficient solubilization effect of the microbial liquid on organic gas, the microorganisms can capture organic gas to the greatest extent, making VOC S Entering the microbial liquid phase, VOCs entering the microbial liquid phase S Microorganisms efficiently decompose and metabolize some VOCs S Transform into microorganisms to achieve VOC S The carbon fixation function of the remaining VOC S As microbial energy, it is converted into carbon dioxide and water, thereby achieving VOC S Removal and purification;

[0017] The air-water separator uses inorganic porous lightweight fillers to remove moisture and impurities from the air, improve air dryness and cleanliness, reduce wind resistance, and at the same time extend the life of the bio-enzyme reaction box and reduce the subsequent reaction time;

[0018] The bio-enzyme reaction box further purifies the trace impurity gas components in the air after being degraded by microorganisms, and further decomposes and purifies them under the action of high-efficiency bio-enzymes with activated carbon as the carrier, ensuring that the outlet air meets the emission standards.

[0019] Beneficial effects of the utility model:

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] 1. It can be processed at room temperature, which is safer. 2. It does not use natural gas, which avoids energy waste, and does not use catalysts. It relies on biological bacteria for online degradation, which is more environmentally friendly. 3. The equipment is simple, the investment cost-effectiveness is high, the operation is easy, the maintenance cost is low, and it is more economical. 4. It solves the problem of difficult gas-liquid mixing and difficult capture and degrading of waste gas. 5. The biodegradation treatment system in the utility model device can reuse the biological bacterial liquid to ensure the activity of the biological bacterial liquid, reduce space, and reduce costs. 6. The device can continuously degrade and treat VOCs online, solving the problem that VOCs waste gas is difficult to capture and degrade. It has low energy consumption, low cost, safety and environmental protection, and can meet the needs of enterprises for continuous production and online degradation of VOCs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of the online biodegradation VOCs device of the utility model.

[0023] Figure 2 This is a schematic structural diagram of another embodiment of the online VOCs biodegradation device of the utility model.

[0024] Reference numerals:

[0025] 1. Biodegradation treatment system; 20. Circulating water pump; 30. Sprinkler head; 40. Filter material layer; 50. Demister; 19. Bio-bacteria circulating water tank; 60. Biodegradation tower; 16. Aeration equipment; 17. Waste gas inlet;

[0026] 2. Gas-water separator; 21. Primary water absorption zone; 22. Deep water absorption zone;

[0027] 3. Biological enzyme reaction box: 31. Biological enzyme;

[0028] 4. Fan;

[0029] 5. Chimney. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the above contents of the utility model through specific implementation methods in the form of embodiments in conjunction with the accompanying drawings. However, it should not be understood that the scope of the above subject matter of the utility model is limited to the following examples. All technologies realized based on the above contents of the utility model belong to the scope of the utility model.

[0031] Example 1

[0032] like Figure 1 As shown, a VOCs waste gas online biodegradation device comprises a biodegradation treatment system 1, a gas-water separator 2 and a bio-enzyme reaction box 3 connected in sequence; the biodegradation treatment system can make the VOCs waste gas entering the bottom of the biodegradation tower and running from bottom to top fully contact and react with the biological bacterial liquid sprayed from top to bottom in a mist form to obtain a first purified gas; the gas-water separator 2 can remove moisture and impurities from the first purified gas to obtain a second purified gas; the bio-enzyme reaction box 3 is provided with a bio-enzyme 31 with activated carbon as a carrier, which can decompose and purify the second purified gas by the bio-enzyme to obtain a third purified gas that can meet the emission standards.

[0033] The biodegradation treatment system 1 includes a biodegradation tower 60 (biological reaction tower), a filter media layer 40, a spray head 30, a circulation water pump 20, an aeration device 16 (oxygen supply fan), and a demister 50. The biodegradation tower 60 is the main tower of the biodegradation system and is a closed horizontal tower with biological bacterial liquid installed at the bottom inside the tower. The circulation water pump 20 is installed at the bottom inside the biodegradation tower, and the spray head 30 is installed at the top inside the biodegradation tower. The circulation water pump 20, the vertical spray pipeline connected to its outlet, and the spray head 30 form a biological bacterial liquid circulation system. The aeration device 16 is an oxygen supply fan located outside the biodegradation tower, and its outlet pipeline is connected to the bottom of the tower to provide oxygen for the biological bacterial liquid at the bottom of the tower. The two sides of the biodegradation tower 20 are respectively provided with an exhaust gas inlet 17 and an exhaust gas outlet 18. The exhaust gas inlet 17 is located at the top of one side of the tower, and the exhaust gas outlet 18 is located at the top of the other side of the tower. An intake channel is provided on the side of the tower near the exhaust gas inlet 17, and the exhaust gas enters the bottom inside the tower through the intake channel. A vertical intake channel is provided at the place near the exhaust gas inlet 17 inside the tower, and the exhaust gas enters the bottom inside the tower through the intake channel. The remaining middle and upper space inside the tower is divided into multiple reaction chambers by a plurality of filter media layers 40 arranged vertically and spaced in parallel. A set of biological bacterial liquid circulation system (including the circulation water pump 20, the vertical spray pipeline connected to its outlet, and the spray head 30) is provided in each reaction chamber. Spray heads 30 are symmetrically arranged at different height positions on the vertical spray pipeline. A corrugated plate demister 50 is provided at the exhaust gas outlet 18 of the biodegradation tower 60. Inside each reaction chamber, the biological bacterial liquid at the bottom inside the biodegradation tower 60 reaches the spray head 30 at the top through the circulation water pump 20 and the vertical spray pipeline connected to its outlet, is atomized and sprayed downward, and fully contacts and reacts with the exhaust gas running upward from the bottom inside the tower (the painting exhaust gas enters the biological reaction tower 20 from the exhaust gas inlet 17 on the left side through the air duct by the original blower in the painting workshop and runs upward, and fully contacts and reacts with the biological bacterial liquid sprayed in a mist form downward from the spray head 30 through the circulation pump 2 inside the tower. The biological reaction tower 60 is designed as such a horizontal tower, and such contact reaction is more sufficient and the degradation efficiency is higher). Most of the VOCs in the exhaust gas are degraded by the biological bacteria. Then, after the exhaust gas absorbs water through the filter media layer 40 and is demisted by the demister 50, it leaves the biological adsorption and degradation system 1 from the exhaust gas outlet 18 at the top on the right side and the air outlet pipe and enters the air-water separator 2.

[0034] The strains in the biological bacterial liquid are one or both of Beijerinckia sp. LM-W and Brevundimonas sp. LM-R, which can capture, disperse, and degrade the exhaust gas.

[0035] The air-water separator 2 includes a primary water absorption area 201 composed of filter cotton and a deep water absorption area 202 composed of multiple layers of inorganic lightweight porous fillers. The first purified gas first removes moisture and impurities primarily through the filter cotton and then completely removes moisture and impurities through the multiple layers of inorganic lightweight porous fillers to obtain the second purified gas.

[0036] The biodegradation treatment system also includes a pH value control module, a temperature control module and a dissolved oxygen value control module, which automatically controls the pH value, temperature and dissolved oxygen value of the biodegradation tower through a PLC controller; a pH value sensor, a temperature sensor and a dissolved oxygen value sensor are arranged in the biodegradation tower 60; the signal input end of the temperature controller is connected to the temperature sensor, and the signal output end is connected to the electric heater of the biodegradation tower; the signal input end of the pH value controller is connected to the pH value sensor, and the signal output end is connected to the acid-base tank; the signal input end of the dissolved oxygen controller is connected to the dissolved oxygen value sensor, and the signal output end is connected to the oxygen supply fan.

[0037] The working principle of the VOCs waste gas online biodegradation device described in this embodiment is as follows:

[0038] The VOCs waste gas enters the biodegradation treatment system 1 through the blower, and enters the biodegradation tower 60 from the waste gas inlet 17 on the left through the air duct and runs from bottom to top, and fully contacts and reacts with the biological bacteria liquid sprayed from top to bottom through the circulation pump 20 in the tower and enters the spray head 30, and most of the VOCs in the waste gas are degraded by the biological bacteria; thereafter, the waste gas absorbs water through the filter layer 40, and then passes through the demister 50 for defog, and then leaves the biological adsorption degradation system from the waste gas outlet 18 and the air outlet pipe on the top right, and enters the gas-water separator 2.

[0039] After passing through the biodegradation treatment system 1, the waste gas enters the gas-water separator 2, where it first passes through filter cotton to remove moisture and impurities, and then passes through multiple inorganic light porous fillers to completely remove moisture and impurities in the gas. The inorganic light porous filler is an irregular particle with a diameter of 5-50mm. The particle has a microporous structure, a porosity of 50% to 90%, and a specific surface area of ​​more than 2m 2 / g. Preferably, the particle specific gravity is less than or equal to 0.3KG / m 3 The microporous structure is mostly through-holes, and the minimum pore size is as fine as micron level. Lightweight porous inorganic filter stone has good corrosion resistance to both acid and alkali. As a new type of filter material, it has the characteristics of large specific surface area, low density, low thermal conductivity, low relative density, high porosity and high adsorption rate. After the biological bacteria liquid is adsorbed on the surface, VOCs waste gas is effectively adsorbed, and the gas-liquid dissolution reaction time is increased, which has a good use effect on VOCs waste gas treatment.

[0040] After passing through the gas-water separator 2, the waste gas enters the bio-enzyme reaction box 3, where it is decomposed and purified under the action of bio-enzymes with activated carbon as the carrier, so as to further purify the gas components containing trace impurities, ensure that the outlet air meets the emission standards, and finally be directly discharged from the chimney 5 through the fan 4.

[0041] The VOCs waste gas online biodegradation device described in this embodiment can continuously degrade and treat VOCs online, solving the problem that VOCs waste gas is difficult to capture and degrade. It is safe, environmentally friendly, low in energy consumption, and low in cost, and can meet the needs of enterprises for continuous production and online degradation of VOCs.

[0042] Example 2

[0043] The VOCs waste gas online biodegradation device described in this embodiment is basically the same as the VOCs waste gas online biodegradation device described in Example 1, except that: there are two sets of biodegradation treatment systems 1, which are connected in series; there are two sets of bio-enzyme reaction boxes 3, which are connected in parallel.

[0044] like Figure 2 As shown, the VOCs waste gas online biodegradation device described in this embodiment includes two sets of biodegradation treatment systems 1, a set of gas-water separators 2 and two sets of bio-enzyme reaction boxes 3 connected in sequence; the two sets of biodegradation treatment systems 1 are connected in series; and the two sets of bio-enzyme reaction boxes 3 are connected in parallel.

[0045] Two sets of biodegradation treatment systems 1 are installed in series. The purpose is to provide more effective waste gas treatment. For high-concentration VOCs waste gas, the use of a two-stage series biodegradation treatment system 1 can increase the degradation rate; after further purification through gas-water separation and bio-enzyme reaction, it can meet the emission standards.

[0046] Two sets of bio-enzyme reaction boxes 3 are installed in parallel. The purpose is to provide spare bio-enzyme reaction boxes to ensure reliable waste gas treatment and ensure that the standards are met.

Claims

1. A VOCs waste gas online biodegradation device, characterized in that: The device comprises a biodegradation treatment system, a gas-water separator and a bio-enzyme reaction box which are connected in sequence; the biodegradation treatment system can make the VOCs waste gas entering the bottom of the biodegradation tower and running from bottom to top fully contact and react with the biological bacterial liquid sprayed from top to bottom in a mist form, so as to obtain a first purified gas which degrades and removes most of the VOCs; the gas-water separator can remove moisture and impurities from the first purified gas, so as to obtain a second purified gas; the bio-enzyme reaction box is provided with a bio-enzyme with activated carbon as a carrier, so as to decompose and purify the second purified gas through the bio-enzyme, so as to obtain a third purified gas which can meet the emission standards.

2. The VOCs waste gas online biodegradation device according to claim 1, characterized in that: The biodegradation treatment system comprises a biodegradation tower, an aeration device, a biological bacteria liquid circulation system and a filter material layer; the biodegradation tower is a closed horizontal tower, and the bottom of the tower is filled with biological bacteria liquid; the biological bacteria liquid circulation system comprises a circulating water pump and a vertical spray pipe and a spray head connected to the outlet; the circulating water pump is arranged at the bottom of the biodegradation tower, and the spray head is arranged at the top of the biodegradation tower; the aeration device is an oxygen supply fan, which is located outside the biodegradation tower, and its outlet pipe is connected to the bottom of the tower to supply oxygen for the biological bacteria; the filter material layer is filled with porous filter material; the waste gas inlet is located at the top of one side of the tower, and the waste gas outlet is located at the top of the other side of the tower; a vertical air intake channel is arranged near the waste gas inlet in the tower, and the waste gas enters the bottom of the tower through the air intake channel; the remaining middle and upper space in the tower is divided into a plurality of reaction chambers by a plurality of filter material layers arranged in parallel at vertical intervals, and each reaction chamber is provided with a set of biological bacteria liquid circulation system including a circulating water pump and a vertical spray pipe and a spray head connected to the outlet, and the spray heads are symmetrically arranged at different heights on the vertical spray pipe.

3. The VOCs waste gas online biodegradation device according to claim 2, characterized in that: In the biodegradation treatment system, the bacterial species in the biological bacterial liquid are one or both of Beyerlinckia LM-W and Brevimonas LM-R.

4. The VOCs waste gas online biodegradation device according to claim 2 or 3, characterized in that: The biodegradation treatment system also includes a demister; a wave plate type demister is arranged at the waste gas outlet of the biodegradation tower.

5. The VOCs waste gas online biodegradation device according to claim 2 or 3, characterized in that: The biodegradation treatment system also includes a pH value control module, a temperature control module and a dissolved oxygen value control module, which automatically controls the pH value, temperature and dissolved oxygen value of the biodegradation tower through a PLC controller; a pH value sensor, a temperature sensor and a dissolved oxygen value sensor are arranged in the biodegradation tower; the signal input end of the temperature controller is connected to the temperature sensor, and the signal output end is connected to the electric heater of the biodegradation tower; the signal input end of the pH value controller is connected to the pH value sensor, and the signal output end is connected to the acid-base tank; the signal input end of the dissolved oxygen controller is connected to the dissolved oxygen value sensor, and the signal output end is connected to the oxygen supply fan.

6. The VOCs waste gas online biodegradation device according to claim 1, characterized in that: The gas-water separator comprises a primary water absorption zone formed by filter cotton and a deep water absorption zone formed by multiple channels of inorganic light porous fillers.

7. The VOCs waste gas online biodegradation device according to claim 6, characterized in that: The inorganic light porous filler is an irregular particle with a diameter of 5-50 mm, and the particle has a microporous structure, a porosity of 50% to 90%, and a specific surface area of ​​more than 2 m 2 / g.

8. The VOCs waste gas online biodegradation device according to claim 1, characterized in that: The biological enzyme reaction boxes are in multiple sets, and the multiple sets of biological enzyme reaction boxes are installed in parallel.

9. The VOCs waste gas online biodegradation device according to claim 1, characterized in that: The biodegradation treatment system comprises multiple sets, and the multiple sets of biodegradation treatment systems are installed in series.

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