Device for treating low-concentration organic waste gas

Abstract

The utility model relates to a device for treating low-concentration organic waste gas, which comprises a treatment main tower, a peroxymonosulfate box and a microbial nutrient box, the treatment main tower is provided with a circulating water tank, a first waste gas distributor, a micro-electrolysis structure layer, a micro-nano bubble releaser layer, a microbial nutrient solution circulating tank, a microbial carrier filler layer, a microbial nutrient solution spiral atomizer, a demisting layer and a purified waste gas outlet from bottom to top; a waste gas port is formed in the microorganism nutrient solution circulating box, and a second waste gas distributor is arranged on the waste gas port; the peroxymonosulfate tank and the micro-nano bubble releaser layer are respectively connected with the circulating water tank, and the microbial nutrient tank and the microbial nutrient solution spiral atomizer are respectively connected with the microbial nutrient solution circulating tank. The peroxymonosulfate is synergistically activated by micro-nano bubbles and a micro-electrolysis structure to generate oxyradicals, so that the yield and the concentration of the oxyradicals are improved, the degradation reaction time of organic waste gas pollutants is remarkably shortened, and the treatment efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of organic waste gas treatment, in particular to a device for treating low-concentration organic waste gas by micro-electrolysis and micro-nano bubble coordinated persulfate coupled bio-trickling filtration. Background Art

[0002] With the sustained and rapid economic development, the total amount of volatile organic compounds emitted by industrial sources has increased year by year, and environmental pollution problems have become increasingly prominent. Volatile organic compounds refer to organic compounds with a saturated vapor pressure greater than 133.32 Pa at room temperature and a boiling point below 50-260°C at normal pressure, or any organic solid or liquid that can volatilize at room temperature and pressure. Most VOCs are highly toxic and are one of the important precursors to the formation of photochemical smog and PM2.5. They have an important impact on regional atmospheric ozone, PM2.5 pollution and human health.

[0003] At present, most of the organic waste gas generated in industry is of low concentration, such as the furniture industry, plywood industry, metal surface treatment industry, machinery manufacturing industry, etc. Low-concentration organic waste gas is not suitable for direct incineration. If incineration is required, it must be concentrated first to increase the concentration of organic matter. For chlorine-containing organic matter, incineration will also produce highly toxic secondary pollutants such as dioxins.

[0004] At present, for low-concentration organic waste gas, the industry often uses biodegradation, chemical degradation, adsorption and other processes for treatment. Among them, the biological method has low cost and small secondary pollution, but it is applicable to a narrow concentration and has poor anti-fluctuation. In addition, it is not effective for treating organic waste gas with high toxicity (such as dichloromethane) or difficult biodegradation (such as containing benzene ring structure); the chemical degradation method removes thoroughly, but the energy consumption and material consumption are high; the adsorption method has high removal efficiency and low operating cost, but it is necessary to dispose of the used adsorbent as solid waste or desorb and regenerate it for recycling. The adsorbent regeneration process generally adopts thermal desorption, and the high-concentration organic waste gas under desorption is treated through subsequent processes. The treatment process has high energy consumption and is prone to secondary pollution.

[0005] Advanced oxidation is a recently emerging organic waste gas treatment technology with the characteristics of fast reaction rate, mild reaction conditions, and high purification efficiency, and has attracted much attention. Advanced oxidation (such as ultraviolet photolysis, low-temperature plasma, etc.) can effectively destroy the chemical bonds of organic waste gas through external energy input. At the same time, these energies can also act on the reaction medium (such as air, water vapor, etc.) to produce more oxidizing active substances or free radicals (such as ozone, hydroxyl radical 0H-, etc.), thereby enhancing the ability to destroy VOCs. Persulfate, represented by peroxymonosulfate, as a new type of oxidant, has received widespread attention in the field of deep treatment of drinking water and treatment of refractory organic wastewater, and its research and application are very active. Peroxymonosulfate can be activated by a variety of substances or energies (such as ultraviolet, heat, metal oxide catalysts, etc.) in a normal temperature and pressure system, and can not only produce 0H-, but also produce S04- with a higher redox potential, and its oxidation ability is often higher than that of ozone and hydrogen peroxide systems.

[0006] Chinese patents CN104258707A and CN102908886A disclose methods for treating organic waste gas using micro-nano bubbles. It is hoped that during the process of self-contraction of the micro-nano bubbles, the internal pressure increases as the diameter decreases, and a local high temperature and high pressure point will be generated in the final stage of shrinkage and disappearance, thereby promoting the generation of hydroxyl radicals, and utilizing the generated hydroxyl radicals to degrade the organic waste gas. However, the amount of hydroxyl radicals generated by the natural collapse of the micro-nano bubbles is small, and the generated hydroxyl radicals exist for a short time. In essence, the efficiency of oxidative degradation of organic waste gas is low, and the application requirements of degrading organic waste gas cannot be met well.

[0007] Chinese patent CN107243234A discloses a method for degradation of organic waste gas by micro-nano bubbles in coordination with persulfate oxidation. The persulfate described in the patent is a mixture of any two or three of Na2S2O8, K2S2O8, (NH4)2S2O8 in any mass ratio. The disadvantage of this method is that the temperature of the micro-nano bubble generating liquid must be 40-50°C and the pH must be adjusted to 3-11 with 98% mass concentration of sulfuric acid or sodium hydroxide.

[0008] Chinese patent CN206935069U discloses a device for treating organic waste gas by combining a microbubble system with a negative ion purification device. The disadvantage of this device is that the organic waste gas purification efficiency is low and secondary pollution (ozone) is generated.

[0009] Chinese patent CN109126433A discloses a method and device for removing volatile organic compounds by using ultraviolet-activated gaseous persulfate. The patent uses a blower to gasify an aqueous persulfate solution, and then uses ultraviolet light to activate the gaseous persulfate to produce oxidative free radicals to treat organic waste gas. The method has high energy consumption for gasifying the aqueous persulfate solution, and the ultraviolet light tube for activating the persulfate is easily covered with dirt on the surface, resulting in a decrease in efficiency. This is also one of the reasons why many places now explicitly restrict the use of photocatalytic oxidation to treat organic waste gas.

[0010] Chinese patent CN116351236A discloses a device and method for efficiently removing VOCs by coupling micro-nano bubbles with biological methods. The patent aims to utilize the characteristics of micro-nano bubbles, such as large specific surface area, ability to enhance mass transfer between gas and liquid, provision of abundant dissolved oxygen, generation of strong oxidizing hydroxyl radicals upon rupture, ability to oxidize pollutants, and enhancement of biodegradability of pollutants, to couple micro-nano bubbles with microorganisms in the same unit. However, micro-nano bubbles can decompose organic matter, which of course also has an inhibitory effect on the growth of microorganisms. Utility Model Content

[0011] The technical problem to be solved by the utility model is: based on the deficiencies of the existing low-concentration organic waste gas treatment devices, a device for treating low-concentration organic waste gas is provided.

[0012] The technical solution to solve the above technical problems is: a device for treating low-concentration organic waste gas, comprising a main treatment tower, a permonosulfate tank and a microbial nutrient agent tank, wherein the main treatment tower is provided with a circulating water tank, a first waste gas distributor, a micro-electrolysis structure layer, a micro-nano bubble releaser layer, a microbial nutrient solution circulation box, a microbial carrier filler layer, a microbial nutrient solution spiral atomizer, a demisting layer and a purified waste gas outlet from bottom to top; a waste gas inlet is provided on the side wall at the lower end of the main treatment tower, the first waste gas distributor is an air inlet pipe and is connected to the waste gas inlet; a waste gas vent is provided on the microbial nutrient solution circulation box, a second waste gas distributor is provided on the waste gas vent, and blades are provided on the second waste gas distributor; the permonosulfate tank and the micro-nano bubble releaser layer are respectively connected to the circulating water tank, and the microbial nutrient agent box and the microbial nutrient solution spiral atomizer are respectively connected to the microbial nutrient solution circulation box.

[0013] The further technical scheme of the utility model is: the second exhaust gas distributor is an umbrella-shaped structure, the umbrella surface of the second exhaust gas distributor is composed of a plurality of turbulent blades, the turbulent blades are evenly distributed at an inclination angle of 40° to 60°, and two adjacent turbulent blades have an overlapping area of ​​2° to 5°. The umbrella handle of the second exhaust gas distributor is arranged on the microbial nutrient solution circulation box through a cross bar, and the umbrella handle is arranged on the cross bar through a bearing. The umbrella handle is connected to the umbrella surface to form a whole and rotates with the umbrella surface, and the umbrella surface rotates under the action of the rising airflow.

[0014] The permonosulfate tank is connected to the circulating water tank through the spiral doser I and the ORP meter, the spiral doser I and the ORP meter are interlocked, and the micro-nano bubble releaser layer is connected to the circulating water tank through a high-pressure pump. The microbial nutrient tank is connected to the microbial nutrient solution circulating tank through the spiral doser II, and the microbial nutrient solution spiral atomizer is connected to the microbial nutrient solution circulating tank through a circulating spray pump.

[0015] The micro-electrolysis structural layer is composed of granular activated carbon, iron filings and plastic hollow balls with mesh surfaces. The granular activated carbon and iron filings are filled into the plastic hollow balls with a filling rate of 80-90%, and the volume ratio of granular activated carbon to iron filings is 1:0.3-1:1; the mesh aperture of the plastic hollow balls is 5-10mm; the particle size of the granular activated carbon is 15-20mm; the iron filings are 15-20mm wide and 20-30mm long, obtaining a larger specific surface area under the same mass; the diameter of the plastic hollow balls is 80-100mm; the plastic hollow balls are suspended in the main treatment tower in an up-and-down staggered manner to form a micro-electrolysis structural layer with a thickness of 80-120cm. The plastic hollow balls sway and collide under the action of the rising airflow to avoid agglomeration of the filler.

[0016] The microbial carrier filler layer is composed of granular activated carbon and plastic hollow balls. The granular activated carbon is filled in the plastic hollow balls with mesh holes on the surface, with a filling rate of 80-90%; the mesh holes on the surface of the plastic hollow balls have an aperture of 5-10mm; the activated carbon particle size is 15-20mm; the diameter of the plastic hollow balls is 80-100mm; the plastic hollow balls are suspended in the main treatment tower in an up-and-down staggered manner to form a microbial carrier filler layer with a thickness of 80-120cm. The plastic hollow balls sway and collide under the action of the rising airflow to prevent the filler from agglomerating.

[0017] Due to the adoption of the above technical solution, the device for treating low-concentration organic waste gas of the utility model has the following beneficial effects:

[0018] (1) The utility model adds peroxymonosulfate, and the micro-electrolysis structure is used to activate the peroxymonosulfate. When the organic waste gas passes through the micro-electrolysis structure, a physical and chemical reaction occurs. The organic waste gas reacts with the free radicals generated by the activation of the peroxymonosulfate, and part of it is mineralized into carbon dioxide and water, and part of it is decomposed into small molecular organic matter that is easier to biodegrade, which is beneficial to the subsequent biochemical treatment. Wastewater treatment uses advanced oxidation methods before biological treatment to improve the biodegradability of wastewater, and then performs biochemical treatment, but no relevant patents have been found for waste gas treatment. Therefore, the utility model is different from conventional organic waste gas biological purification.

[0019] (2) The utility model adds persulfate with strong oxidizing ability, and activates persulfate through micro-nano bubbles to produce oxidative free radicals, such as hydroxyl, excited oxygen, sulfate, etc. Their reduction potential E0 = +2.6V~+2.8V, with extremely strong oxidizing properties, can quickly degrade organic pollutants, part of which is mineralized into carbon dioxide and water, and part of which is decomposed into small molecular organic matter, which is conducive to microbial decomposition.

[0020] (3) The utility model adds micro-nano bubbles and micro-electrolysis structures, which synergistically activate peroxymonosulfate to produce oxidative free radicals, thereby increasing the yield and concentration of oxidative free radicals, significantly shortening the degradation reaction time of organic waste gas pollutants, and improving the system treatment efficiency.

[0021] (4) The present invention uses peroxymonosulfate instead of the persulfate of the prior art, which has the advantages of not needing to heat the micro-nano bubble generating liquid and not needing to use 98% mass concentration sulfuric acid or sodium hydroxide to adjust the pH to 3-11.

[0022] (5) The unique umbrella-shaped exhaust gas distributor designed in the utility model can prevent the microbial nutrient solution from falling into the circulating water tank containing peroxymonosulfate and mixing with each other to affect the treatment effect, and ensure the uniform distribution of the exhaust gas, ultimately realizing the integrated structure of micro-electrolysis + micro-nano bubble coordinated peroxymonosulfate coupled bio-trickling filtration.

[0023] (6) The micro-electrolysis structure is to fill large particles of activated carbon and flaky iron filings into a plastic hollow ball with a mesh surface. The plastic hollow balls are suspended in an orderly manner in a staggered manner on a hanger. They sway and collide under the action of the rising air flow, which ensures that the exhaust gas is in full contact with the filler and prevents the filler from agglomerating.

[0024] (7) The microbial carrier filler layer is made by filling large particles of activated carbon into a plastic hollow ball with a mesh surface. The plastic hollow balls are staggered and orderly suspended in the air. They sway and collide under the action of the rising airflow, which ensures that the exhaust gas is in full contact with the filler and prevents the filler from agglomerating.

[0025] (8) Compared with other processes, the utility model has the characteristics of simple operation, no secondary pollution, high economic benefits, etc., and the removal rate of organic waste gas is as high as over 95%.

[0026] Below, the technical features of a device for treating low-concentration organic waste gas of the utility model are further explained in combination with the drawings and specific embodiments of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 : A schematic structural diagram of a device for treating low-concentration organic waste gas.

[0028] Figure 2: Schematic diagram of the structure of the second exhaust gas distributor.

[0029] Figure 3 : Schematic diagram of the blades in the second exhaust gas distributor ( Figure 2 of the top view).

[0030] Figure 4 : Schematic diagram of the structure of the defogging layer.

[0031] Figure 5 : Schematic diagram of the structure of the micro-electrolysis structure layer.

[0032] Figure 6 : Schematic diagram of the structure of the mesh plate for hanging plastic hollow balls.

[0033] Figure 7 :Treat the organic waste gas generated in the processes of glue making and gluing in plywood production.

[0034] Figure 8 :To treat organic waste gas produced by paint spraying equipment.

[0035] Fig. 9 : Xylene was used as a representative of volatile organic compounds for comparative tests.

[0036] In the above drawings, the descriptions of the reference numerals are as follows:

[0037] 1-circulating water tank, 2-waste gas inlet, 3-first waste gas distributor inspection hole, 4-main treatment tower, 5-micro-electrolysis structure layer inspection hole, 6-second waste gas distributor inspection hole, 7-microorganism carrier filler layer inspection hole, 8-demist layer inspection hole, 9-purified waste gas outlet, 10-demist layer, 11-microorganism nutrient solution spiral atomizer, 12-solid microorganism nutrient agent box, 13-spiral doser II, 14-second waste gas distributor, 15-microorganism nutrient solution circulation box, 16-circulating spray pump, 17-micro-nano bubble releaser layer, 18-micro-electrolysis structure layer, 19-first waste gas distributor, 20-ORP meter, 21-permonosulfate box, 22-spiral doser I, 23-high pressure pump, 24-microorganism carrier filler layer. 25-lower umbrella surface, 26-umbrella handle, 27-horizontal crossbar, 28-bearing, 29-turbulent blades, 30-6-tray, 31-vulcanization ball, 32-center tube, 33-baffle, 34-tower wall of desulfurization and dust removal tower, 35-fixed support frame between center tube and tower wall, 36-mesh plate for hanging plastic hollow ball, 37-plastic hollow ball hanging rope, 38-plastic hollow ball, 39-granular activated carbon, 40-iron filings, 41-mesh on the surface of plastic hollow ball. DETAILED DESCRIPTION

[0038] A device for treating low-concentration organic waste gas, which uses micro-electrolysis and micro-nano bubbles in conjunction with permonosulfate and biological trickling filtration to improve the removal rate of pollutants and achieve pollutant discharge standards. It includes a main treatment tower, a permonosulfate tank and a microbial nutrient tank. The main treatment tower is provided with a circulating water tank, a first waste gas distributor, a micro-electrolysis structure layer, a micro-nano bubble releaser layer, a microbial nutrient solution circulation tank, a microbial carrier filler layer, a microbial nutrient solution spiral atomizer, a demisting layer and a purified waste gas outlet from bottom to top; a waste gas inlet is provided on the side wall of the lower end of the main treatment tower, and the first waste gas distributor is an air inlet pipe and is connected to the waste gas inlet; a waste gas vent is provided on the microbial nutrient solution circulation tank, and a second waste gas distributor is provided on the waste gas vent, and blades are provided on the second waste gas distributor, and the microbial nutrient solution is blocked from falling into the circulating water tank containing permonosulfate through the second waste gas distributor. The permonosulfate tank and the micro-nano bubble releaser layer are connected to the circulating water tank respectively, and the microbial nutrient agent tank and the microbial nutrient solution spiral atomizer are connected to the microbial nutrient solution circulation tank respectively. The main treatment tower is provided with a first exhaust gas distributor inspection hole, a micro-electrolysis structure layer inspection hole, a second exhaust gas distributor inspection hole, and a microbial carrier filler layer inspection hole.

[0039] The second exhaust gas distributor is an umbrella-shaped structure. The umbrella surface of the second exhaust gas distributor is formed by a plurality of turbulent blades evenly distributed at an inclination angle of 40° to 60°. Two adjacent turbulent blades have an overlapping area of ​​2° to 5° overlapping up and down, that is, the overlapping area of ​​the projections of the two adjacent turbulent blades is fan-shaped, and the fan angle is 2° to 5°, also known as the overlapping area fan 2° to 5°. The umbrella handle of the second exhaust gas distributor is set on the microbial nutrient solution circulation box through a crossbar, and the umbrella handle is set on the crossbar through a bearing. The umbrella handle is connected to the umbrella surface to form a whole and rotates with the umbrella surface. The umbrella surface rotates under the action of the rising airflow.

[0040] The second exhaust gas distributor is an umbrella-shaped structure, which is used to prevent the microbial nutrient solution from falling into the circulating water tank containing peroxymonosulfate; the lower umbrella surface of the second exhaust gas distributor is a layer of blades distributed circumferentially, with a higher density of blades, that is, more blades, so the gap between blades is smaller, and there are overlapping areas between adjacent blades. The shape of the blades of the second exhaust gas distributor is like the blades of an electric fan. The handle of the second exhaust gas distributor is fixed with two horizontal cross bars, and the handle is connected to the cross bar through a bearing. The handle can rotate freely at 360 degrees. When the exhaust gas encounters the turbulent blades of the lower umbrella surface from bottom to top, the umbrella-shaped second exhaust gas distributor will rotate freely at 360 degrees, which plays a role in evenly distributing the exhaust gas.

[0041] The first exhaust gas distributor includes a main pipe and several branch pipes with injection holes. One end of the branch pipe is connected to the main pipe and the other end of the branch pipe is closed. The branch pipe is provided with injection holes. The main pipe and the branch pipe are respectively arranged at the lower end of the main treatment tower and located above the circulating water tank. The main pipe of the first exhaust gas distributor is connected to the exhaust gas inlet.

[0042] The permonosulfate tank is connected to the circulating water tank through the spiral doser Ⅰ and the ORP meter, and the micro-nano bubble releaser layer is connected to the circulating water tank through a high-pressure pump. The spiral doser Ⅰ and the ORP meter are interlocked to realize automatic dosing of permonosulfate. When the ORP of the circulating water tank 10 is less than 600mV, a feedback signal is given to the spiral doser, and the spiral doser starts to dosing permonosulfate to the circulating water tank; when the ORP of the circulating water tank is greater than 750mV, a feedback signal is given to the spiral doser, and the spiral doser stops dosing permonosulfate to the circulating water tank. Permonosulfate is a mixture of any one of sodium permonosulfate and potassium permonosulfate or two mixed in any mass ratio. The micro-nano bubble releaser layer is a micro-nano bubble releaser, and the micro-nano bubble release intensity is 1m³ of waste gas: 1~15L micro-nano bubbles.

[0043] The microbial nutrient tank is connected to the microbial nutrient solution circulation tank through the spiral doser II and the timer, and the microbial nutrient solution spiral atomizer is connected to the microbial nutrient solution circulation tank through the circulating spray pump. The spray intensity of the microbial nutrient solution is 1m³ of waste gas: 5~30L of nutrient solution. The spiral doser II is interlocked with the timer to realize the automatic addition of microbial nutrients. When the system operation time of the organic waste gas treatment reaches the set time, the feedback signal is given to the spiral doser, and the spiral doser starts to add microbial nutrients to the microbial nutrient solution circulation tank. The addition time is generally 1 to 5 minutes. When the addition time reaches the designed addition time, the feedback signal is given to the spiral doser, and the spiral doser stops adding microbial nutrients to the microbial nutrient solution circulation tank. The microbial nutrient is a mixture of any two of ammonium carbonate, potassium phosphate, and diammonium dihydrogen phosphate in any mass ratio.

[0044] The micro-electrolysis structural layer is composed of granular activated carbon, iron filings and plastic hollow balls with meshes on the surface. The mesh aperture of the plastic hollow ball surface is 5-10mm; the particle size of the granular activated carbon is 15-20mm; the iron filings are 15-20mm wide and 20-30mm long, and a larger specific surface area is obtained under the same mass; the volume ratio of granular activated carbon and iron filings is 1:0.3-1:1; the diameter of the plastic hollow ball is 80-100mm; the granular activated carbon and iron filings are filled in the plastic hollow ball with meshes on the surface, and the filling rate is 80-90%; the plastic hollow ball is suspended in the main treatment tower in an up-and-down staggered manner, forming a micro-electrolysis structural layer with a thickness of 80-120cm. The plastic hollow ball is suspended in the main treatment tower through the mesh plate for hanging the plastic hollow ball, and the mesh plate for hanging the plastic hollow ball is set in the main treatment tower by bolts or welding. The plastic hollow ball sways and collides up and down under the action of the rising airflow to avoid agglomeration of the filler.

[0045] The micro-electrolysis structure layer activates peroxymonosulfate. When the organic waste gas passes through the micro-electrolysis structure layer, a physical and chemical reaction occurs. The peroxymonosulfate oxidizes free radicals under the synergistic effect of the micro-electrolysis structure and micro-nano bubbles. The organic waste gas reacts with the oxidized free radicals, and part of it is mineralized into carbon dioxide and water, and part of it is decomposed into small molecular organic matter that is easier to biodegrade, which is beneficial to subsequent microbial decomposition. The reaction mechanism is as follows:

[0046]

[0047] The microbial carrier filler layer is composed of granular activated carbon and plastic hollow balls. The mesh aperture of the plastic hollow ball surface is 5-10mm; the activated carbon particle size is 15-20mm; the diameter of the plastic hollow ball is 80-100mm; the granular activated carbon is filled in the plastic hollow ball with mesh holes on the surface, and the filling rate is 80-90%; the diameter of the plastic hollow ball is 80-100mm; the plastic hollow ball is suspended in the main treatment tower in an up-and-down staggered manner to form a microbial carrier filler layer with a thickness of 80-120cm. The plastic hollow ball is suspended in the main treatment tower through the mesh plate for hanging the plastic hollow ball. The mesh plate for hanging the plastic hollow ball is set in the main treatment tower by bolts or welding, and sways and collides under the action of the rising airflow to avoid filler agglomeration. The microbial carrier filler layer provides an attachment and growth environment for microorganisms, where organic waste gas is decomposed into carbon dioxide and water by microorganisms to achieve the purpose of purification.

[0048] The microbial nutrient solution spiral atomizer, micro-nano bubble releaser and spiral doser can be existing ones. The microbial nutrient solution spiral atomizer includes an outer sleeve, a booster plug and an outlet pagoda head. The outer sleeve is provided with 0.5-1 mm micropores around the periphery. The micropores are directly opposite to the annular groove of the booster plug. The threaded end of the outlet pagoda head of the atomizer presses the booster plug tightly. The microbial nutrient solution is released through the narrow notch of the threaded end of the outlet pagoda head. The micro-nano bubble releaser includes an outer sleeve, a booster plug and an outlet pagoda head. The outer sleeve is provided with 0.5-1 mm micropores around the periphery. The micropores are directly opposite to the annular groove of the booster plug. The threaded end of the outlet pagoda head of the micro-nano bubble releaser presses the booster plug tightly. The micro-nano bubble is released through the narrow notch of the threaded end of the outlet pagoda head. The spiral doser includes a support, a silo, a motor and a conveying section. A screw conveyor is arranged in the conveying section. A feed port is arranged at one end of the conveying section close to the motor. The feed port is connected to the silo. A discharge port is arranged at one end of the conveying section away from the motor.

[0049] The demisting layer includes a tray, a central tube, a vulcanization ball and a baffle. The tray, the central tube, the baffle and the vulcanization ball are respectively arranged in the tower wall of the main treatment tower. The tray is provided with turbulent blades. The tray is arranged at the lower end of the central tube and can rotate around the central tube. The baffle is a grid perforated plate, which is arranged at the upper end of the central tube. The tray, the central tube, the baffle and the tower wall of the main treatment tower form a circular track for placing the vulcanization ball, and the vulcanization ball is placed in the circular track; the demisting layer is placed on the main treatment tower, and the gas in the main treatment tower flows from bottom to top. When the gas passes through the track vulcanization dust removal and demisting device, the airflow drives the tray and the vulcanization ball to rotate around the central tube. The tray includes a central ring, an outer ring and turbulent blades with smooth surfaces. The two ends of the turbulent blades are respectively connected to the central ring and the outer ring, and the turbulent blades are arranged between the central ring and the outer ring in an inclined manner. The turbulent blades are evenly distributed in the annular area between the central ring and the outer ring at an inclination angle of 30° to 60°.

[0050] Specifically, the specific implementation of the embodiment of the utility model is described in detail with reference to the accompanying drawings.

[0051] Referring to the attached drawings, a device for treating low-concentration organic waste gas includes a main treatment tower, a persulfate tank and a microbial nutrient tank. The main treatment tower is provided with a circulating water tank 1, a waste gas inlet 2, a first waste gas distributor 19, a first waste gas distributor inspection hole 4, a micro-electrolysis structure layer 18, a micro-electrolysis structure layer inspection hole 5, a micro-nano bubble releaser layer 17, a microbial nutrient solution circulation box 15, a second waste gas distributor 14, a second waste gas distributor inspection hole 6, a microbial carrier filling layer 24, a microbial carrier filling layer inspection hole 7, a microbial nutrient solution spiral atomizer 11, a demisting layer 10, a demisting layer inspection hole 8 and a purified waste gas outlet 9 from bottom to top.

[0052] The micro-electrolysis structure layer 18 is 100 cm thick and is composed of granular activated carbon 39, iron filings 40 and plastic hollow balls 38 with mesh holes on the surface. The mesh holes 41 on the surface of the plastic hollow balls 38 have an aperture of 8 mm; the particle size of the granular activated carbon 39 is 18 mm; the iron filings 40 are 20 mm wide and 25 mm long; the volume ratio of the granular activated carbon 39 to the iron filings 40 is 1:1; the diameter of the plastic hollow balls 38 is 100 mm; the granular activated carbon 39 and the iron filings 40 are filled in the plastic hollow balls with mesh holes 41 on the surface, with a filling rate of 85%; the plastic hollow balls 41 are suspended from the mesh plate 36 of the hanger, and sway and collide under the action of the rising airflow to prevent the filler from agglomerating.

[0053] The microbial carrier filler layer is 100cm thick and consists of granular activated carbon and plastic hollow balls. The mesh diameter of the plastic hollow ball surface is 10mm; the activated carbon particle size is 20mm; the diameter of the plastic hollow ball is 100mm; the granular activated carbon is filled in the plastic hollow ball with mesh holes on the surface, with a filling rate of 90%; the plastic hollow ball is suspended on a hanger, swaying and colliding under the action of the rising airflow to prevent the filler from agglomerating.

[0054] The micro-nano bubble release intensity of the micro-nano bubble releaser 17 is 1m³ of waste gas: 10L of micro-nano bubbles. The microbial nutrient solution spraying intensity of the microbial nutrient solution spiral atomizer 11 is 1m³ of waste gas: 15L of nutrient solution. The peroxymonosulfate is sodium peroxymonosulfate. The solid microbial nutrient agent is a 1:1 mixture of ammonium carbonate and potassium phosphate. The second exhaust gas distributor is an umbrella-shaped structure, and the lower umbrella surface of the second exhaust gas distributor is provided with a plurality of turbulent blades 12 evenly distributed at an inclination angle of 50°. The front and rear turbulent blades are both provided with a 4° overlapping area, and the umbrella handle is fixed with two horizontal cross bars, and the umbrella handle is connected to the cross bar through a bearing, and the umbrella handle can rotate freely 360°. Embodiment 1:

[0055] The utility model is used to treat organic waste gas generated in the processes of glue making and gluing in plywood production. The main components of organic waste gas are formaldehyde and phenol, and the formaldehyde concentration is 40-60 mg / m 3 , phenol concentration is 75~150mg / m 3 .

[0056] Add tap water and microbial strains to the microbial nutrient solution circulation tank of the system, add solid ammonium carbonate, potassium phosphate and phosphoric acid in the microbial nutrient agent tank at any mass ratio of 1:1 and set the timer for 2-8 hours, add sodium permonosulfate to the permonosulfate tank and set the ORP meter, and add tap water to the circulating water tank. When the power is turned on, the permonosulfate dosing system and the microbial nutrient agent dosing system will work automatically.

[0057] Turn on the high-pressure pump of the micro-nano bubble generation system and the microbial nutrient solution circulation spray pump.

[0058] The organic waste gas generated by the glue making and gluing processes of plywood production enters the waste gas inlet of the utility model, passes from bottom to top through the first waste gas distributor, the micro-electrolysis structure layer, the second waste gas distributor, the microbial carrier filler layer, the demisting layer and the purified waste gas outlet. Figure 7 It can be seen that even if the microorganisms have not yet taken effect, the removal rate is greater than 75% at the beginning. As the microorganisms take effect, the removal rate gradually increases. After the 15th day, the removal rate is stable at more than 95%, and the removal rate does not increase much thereafter. Embodiment 2:

[0059] The utility model is used to treat the organic waste gas produced by spray painting. The main components of the organic waste gas are benzene and xylene, and the toluene concentration is 50-70 mg / m 3 , xylene concentration is 80~120mg / m 3 .

[0060] Add tap water and microbial strains to the microbial nutrient solution circulation tank of the system, add solid ammonium carbonate, potassium phosphate and phosphoric acid in the microbial nutrient tank at any mass ratio of 1:1 and set the timer for 2-8 hours, add sodium permonosulfate to the permonosulfate tank and set the ORP meter, and add tap water to the circulating water tank. When the power is turned on, the permonosulfate dosing system and the microbial nutrient dosing system will work automatically.

[0061] Turn on the high-pressure pump of the micro-nano bubble generation system and the microbial nutrient solution circulation spray pump.

[0062] The organic waste gas generated by the glue making and gluing processes of plywood production enters the waste gas inlet of the utility model, passes from bottom to top through the first waste gas distributor, the micro-electrolysis structure layer, the second waste gas distributor, the microbial carrier filler layer, the demisting layer and the purified waste gas outlet. Figure 8 It can be seen that even if the microorganisms have not yet taken effect, the removal rate is greater than 75% at the beginning. As the microorganisms take effect, the removal rate gradually increases. After the 15th day, the removal rate is stable at more than 95%, and the removal rate does not increase much thereafter.

[0063] Comparative test using xylene as a representative of volatile organic compounds

[0064] (1) Micro-nano bubbles acting alone

[0065] The inlet concentration of xylene was set to 200 mg / m³, the residence time of xylene was set to 2s, 4s, 6s, 8s, 10s, 12s, 14s, 16s, 18s, 20s, the dosage of micro-nano bubbles (expressed as the ratio of spray liquid to exhaust gas, i.e. liquid-gas ratio, 4L / m³), the pH value of the spray liquid was 7, and the degradation rate of xylene under the set conditions was as follows. Fig. 9 shown.

[0066] (2) Permonosulfate acting alone

[0067] The xylene inlet concentration was set to 200 mg / m³, the xylene residence time was set to 2s, 4s, 6s, 8s, 10s, 12s, 14s, 16s, 18s, 20s, the permonosulfate dosage (expressed as the ratio of the spray liquid to the exhaust gas volume, i.e., the liquid-gas ratio, 4L / m³), the permonosulfate dosage was 5mM / L, the spray liquid pH value was 7, and the xylene degradation rate under the set conditions was as follows. Fig. 9 shown.

[0068] (3) Micro-electrolysis and micro-nanobubbles synergistically act with peroxymonosulfate

[0069] The inlet concentration of xylene was set to 200 mg / m³, the residence time of xylene was set to 2s, 4s, 6s, 8s, 10s, 12s, 14s, 16s, 18s, and 20s, the dosage of micro-nano bubbles (expressed as the ratio of spray liquid to exhaust gas volume, i.e., liquid-gas ratio, 4L / m³), the dosage of permonosulfate was 5mM / L, the pH value of the spray liquid was 7, and the degradation rate of xylene under the set conditions was as follows. Fig. 9 shown.

[0070] (4) Micro-electrolysis and micro-nanobubbles synergistically coupled persulfate biotrickling filtration

[0071] The inlet concentration of xylene was set to 200 mg / m³, the residence time of xylene was set to 2s, 4s, 6s, 8s, 10s, 12s, 14s, 16s, 18s, and 20s, the dosage of micro-nano bubbles (expressed as the ratio of spray liquid to exhaust gas volume, i.e., liquid-gas ratio, 4L / m³), the dosage of permonosulfate was 5mM / L, the pH value of the spray liquid was 7, tap water and microbial strains were added to the microbial nutrient solution circulation box of the system, and solid ammonium carbonate and potassium phosphate were added to the microbial nutrient agent box at an arbitrary mass ratio of 1:1. The degradation rate of xylene under the set conditions was as follows. Fig. 9 shown.

Claims

1. A device for treating low-concentration organic waste gas, characterized in that: The method comprises a main treatment tower, a peroxymonosulfate tank and a microbial nutrient agent tank. The main treatment tower is provided with a circulating water tank, a first waste gas distributor, a micro-electrolysis structure layer, a micro-nano bubble releaser layer, a microbial nutrient solution circulation box, a microbial carrier filler layer, a microbial nutrient solution spiral atomizer, a demisting layer and a purified waste gas outlet from bottom to top; a waste gas inlet is provided on the side wall at the lower end of the main treatment tower, the first waste gas distributor is an air inlet pipe and is connected to the waste gas inlet; a waste gas vent is provided on the microbial nutrient solution circulation box, a second waste gas distributor is provided on the waste gas vent, and blades are provided on the second waste gas distributor; the peroxymonosulfate tank and the micro-nano bubble releaser layer are respectively connected to the circulating water tank, and the microbial nutrient agent box and the microbial nutrient solution spiral atomizer are respectively connected to the microbial nutrient solution circulation box.

2. The device for treating low-concentration organic waste gas according to claim 1, characterized in that: The second exhaust gas distributor is an umbrella-shaped structure. The umbrella surface of the second exhaust gas distributor is composed of multiple turbulent blades. The turbulent blades are evenly distributed at an inclination angle of 40° to 60°. Two adjacent turbulent blades have an overlapping area of ​​2° to 5°. The umbrella handle of the second exhaust gas distributor is set on the microbial nutrient solution circulation box through a cross bar, and the umbrella handle is set on the cross bar through a bearing.

3. The device for treating low-concentration organic waste gas according to claim 1, characterized in that: The permonosulfate tank is connected to the circulating water tank through the spiral doser I and the ORP meter, the spiral doser I and the ORP meter are interlocked, and the micro-nano bubble releaser layer is connected to the circulating water tank through a high-pressure pump.

4. The device for treating low-concentration organic waste gas according to claim 1, characterized in that: The microbial nutrient agent box is connected to the microbial nutrient solution circulation box through the spiral doser II, and the microbial nutrient solution spiral atomizer is connected to the microbial nutrient solution circulation box through the circulation spray pump.

5. The device for treating low-concentration organic waste gas according to claim 1, characterized in that: The micro-electrolysis structural layer is composed of granular activated carbon, iron filings and plastic hollow balls with mesh surfaces. The granular activated carbon and iron filings are filled into the plastic hollow balls with a filling rate of 80-90%, and the volume ratio of granular activated carbon to iron filings is 1:0.3-1:1; the mesh aperture of the plastic hollow balls is 5-10mm; the particle size of the granular activated carbon is 15-20mm; the iron filings are 15-20mm wide and 20-30mm long; the diameter of the plastic hollow balls is 80-100mm; the plastic hollow balls are suspended in the main treatment tower in an up-and-down staggered manner, forming a micro-electrolysis structural layer with a thickness of 80-120cm.

6. The device for treating low-concentration organic waste gas according to claim 1, characterized in that: The microbial carrier filler layer is composed of granular activated carbon and plastic hollow balls. The granular activated carbon is filled in the plastic hollow balls with mesh holes on the surface, with a filling rate of 80-90%; the mesh holes on the surface of the plastic hollow balls have an aperture of 5-10mm; the activated carbon particle size is 15-20mm; the diameter of the plastic hollow balls is 80-100mm; the plastic hollow balls are suspended in the main treatment tower in an up-and-down staggered manner, forming a microbial carrier filler layer with a thickness of 80-120cm.

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