CN210874826U - Organic waste gas rotating biological disk administers device - Google Patents
Organic waste gas rotating biological disk administers device Download PDFInfo
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- CN210874826U CN210874826U CN201920862189.3U CN201920862189U CN210874826U CN 210874826 U CN210874826 U CN 210874826U CN 201920862189 U CN201920862189 U CN 201920862189U CN 210874826 U CN210874826 U CN 210874826U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The embodiment of the utility model discloses an organic waste gas rotating biological disk treatment device, which comprises a spraying washing section, a modified PVC corrugated plate rotating disk section and a honeycomb activated carbon adsorption rotating disk section which are sequentially connected from front to back, wherein the spraying washing section comprises a plurality of groups of spraying pipes, a packing layer and a biochemical tank at the lower part; the modified corrugated plate rotary table section is formed by attaching a biological film on the surface of a corrugated filler to absorb and degrade organic matters, the biological film rotary table section is alternately transferred into a biochemical tank to realize the update of water and nutrition on the surface of the filler, the activity of the biological film is maintained, and simultaneously, water mist carried by the spraying and washing section is collided and condensed into liquid drop flow to be returned to the biochemical tank; the rotating wheel adsorption section comprises a plurality of groups of honeycomb activated carbon adsorption rotating discs and biochemical tanks. The device is used for solving the defects in the existing organic waste gas collecting and treating device, organically combines the organic waste gas washing with biodegradation, adsorption and medium biological regeneration, and simultaneously meets the requirements of the whole-process operation stability, safety, economy and treatment effectiveness.
Description
Technical Field
The utility model relates to an industrial waste gas treatment technical field, concretely relates to organic waste gas biological treatment device.
Background
Organic waste gas generated in the industries of petrifaction, coating, printing, rubber and the like contains organic compounds such as benzene, toluene, xylene, ethyl acetate, acetone, formaldehyde, methanol and the like, most of the harmful gases are inflammable and explosive, and the emission of a large amount of the harmful gases not only has a certain influence on the ecological environment of a local area, but also has serious harm to the whole global environment, is one of the causes of atmospheric photochemical smog, greenhouse effect and ozone layer destruction, and is an atmospheric pollution source which is mainly treated in our country at present.
The existing organic waste gas treatment devices mainly have two types: one is a recovery device and the other is an abatement device. The recovery device mainly applies carbon adsorption, pressure swing adsorption, condensation method and membrane separation technology, and the recovery device separates organic pollutants by means of temperature, pressure, selective adsorbent, selective permeable membrane and the like through a physical method. The eliminating device has thermal oxidation, catalytic combustion, biological oxidation and integration technology; the elimination device mainly converts organic substances into CO by chemical or biochemical reaction through heat, catalyst and microorganisms2And water. The two have the problems of difficult continuous and stable operation, easy generation of secondary pollution, large initial investment, high operation cost, weak adaptability to the change of the concentration and the components of the organic waste gas and the like in the aspect of organic waste gas treatment. The biological oxidation and integration technology has relatively low initial investment, low operation cost and high removal rate in the aspect of treating the organic waste gas with lower concentration, and has larger development space.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide an organic waste gas biological treatment device for solve current organic waste gas and collect, administer not enough in the device, with organic waste gas washing and biodegradation, absorption and medium biological regeneration organic combination, satisfy full flow operating stability, security, economic nature and the demand of administering validity simultaneously.
In order to achieve the above object, the embodiment of the present invention provides an organic waste gas biological treatment device, including the front and back spray washing section, modified PVC corrugated plate turntable section and honeycomb activated carbon adsorption turntable section that connect gradually, and the above-mentioned three equipment sections are all installed in the casing that comprises lower part cell body and upper portion cover body, wherein
The spraying washing section comprises a first unit and a first biochemical tank, wherein the first unit and the first biochemical tank are arranged in the upper cover body in a front-back mode, and the first unit comprises a first spraying pipe and a first packing layer which are arranged in a front-back mode; the modified corrugated plate rotating disc section comprises an upper cover body and a second biochemical tank at the lower part, and the second unit comprises a second spray pipe and a second modified PVC corrugated plate packing layer which are sequentially arranged from front to back; the honeycomb activated carbon adsorption rotary table section comprises a third unit and a third biochemical tank, wherein the third unit and the third biochemical tank are arranged in the upper cover body in a front-back manner; modified PVC buckled plate carousel and honeycomb active carbon adsorption carousel pass the centre of a circle by the drive shaft and connect in series and drive the rotation, the drive shaft stretches out from one side casing at least.
Furthermore, two grids connected with the top part in the first biochemical tank of the spraying washing section can independently control parameters such as dissolved oxygen, retention time, stirring mode and the like, and meet the requirement of optimizing and controlling the metabolic condition of the microorganism; the spray pipe is arranged in the air inlet direction of the modified PVC corrugated plate rotating disc, and the spray amount can be adjusted according to the requirement of the filler; the modified PVC corrugated plate can increase the microbial biomass, improve the organic waste gas adsorption treatment efficiency and reduce the water mist carried to the honeycomb activated carbon adsorption turntable section.
Furthermore, each first unit is also provided with a first guide plate between the first spray pipe and the first packing layer; each second unit is also provided with a second guide plate between the second spray pipe and the second packing layer; and a third guide plate is arranged in front of the first honeycomb activated carbon adsorption rotary disc section, so that the short flow of the waste gas along the cover body is avoided.
Further, the first biochemical tank, the second biochemical tank and the third biochemical tank are square tanks, the external parts of the tanks are connected in sequence, and the internal parts of the tanks are mutually independent; the upper cover body is communicated with the inside of the three equipment sections, the cross section of the upper cover body is semicircular, the front end of the cover body is connected with an air inlet pipe, and the rear end of the cover body is connected with a discharge pipe.
The first biochemical tank, the second biochemical tank and the third biochemical tank are independently arranged inside, can independently operate according to different operating parameters of the organic waste gas adsorption performance biochemical tank, and can be flexibly configured according to the changes of the number, the size and the like of the components in the three equipment sections, so that the modular management is realized. The upper cover body is communicated with the inside of the three equipment sections and forms a complete gas path of the organic waste gas together with a front-end gas inlet pipe and a rear-end discharge pipe, and the spray pipes, the packing layer, the modified PVC corrugated plate rotating disc, the guide plate, the honeycomb activated carbon adsorption rotating disc and the like are matched with the cover body in shape so that the organic waste gas basically passes through the components. And after the complete treatment of the three equipment sections, the gas meeting the emission standard is discharged.
Further, aeration systems are arranged and uniformly distributed in the first biochemical tank, and second aeration systems are arranged and uniformly distributed in the second biochemical tank; and second aeration systems are arranged and uniformly distributed in the third biochemical tank. The first biochemical tank is divided into two tanks, biochemical operation parameters can be independently adjusted, and circulation flow can be adjusted.
Further, the bottoms of the first biochemical tank, the second biochemical tank and the third biochemical tank are respectively provided with a first liquid outlet, a second liquid outlet and a third liquid outlet which are used for connecting a liquid spray pump and/or a circulating pump; the outlet of the liquid circulating pump is in butt joint with the inlet of the circulating stirring pipe of the spraying pipe and/or the biochemical tank. The liquid circulating pump is used for circulating the liquid working medium in each equipment section; furthermore, the joint of the upper cover body and the lower groove body is sealed by a sealing gasket; the guide plate radially protrudes by 5-10cm relative to the later filler layer or the honeycomb activated carbon adsorption turntable; and the distance between the guide plate and the subsequent filler layer or the honeycomb activated carbon adsorption rotating disc is less than 5 cm.
The joint of each section of the cover body for controlling the flow direction of the waste gas and the lower half groove body is sealed by a sealing gasket, so that air leakage is reduced; a guide plate protruding 5-10cm away from the driving shaft is arranged on one side of the windward side of each section of the packing layer or the turntable, the distance between the guide plate and the packing layer or the turntable is less than 5cm, and short flow and ineffective adsorption of waste gas along the gap of the wall of the cover body are prevented.
Furthermore, one side of the driving shaft extending out of the shell is also connected with a transmission system; the first biochemical tank and the second biochemical tank are also connected with a dissolved oxygen monitoring system and a nutrient solution automatic dosing system. The transmission system is used for connecting a power device and is used for providing power to drive the driving shaft to rotate, and further drives the modified PVC corrugated plate rotating disc and the honeycomb activated carbon adsorption rotating disc to rotate in the shell. The drive shaft can penetrate through the shell at two ends and can adjust the rotating speed under the driving of an external motor and a transmission system. The dissolved oxygen monitoring system and the nutrient solution automatic dosing system are used for monitoring the dissolved oxygen states in the first biochemical tank, the second biochemical tank and the third biochemical tank in real time and automatically supplementing nutrient solution to the biochemical tanks when the proportion of nutrient elements such as C, N, P is disordered.
Furthermore, the thickness of the honeycomb activated carbon adsorption rotary table is 15-25cm, the number of the rotary table is 2-5, the rotating speed is 2-120 r/h, and the rotary table is respectively subjected to hydrophilic treatment and hydrophobic treatment according to different treatment gases so as to improve the adsorption efficiency of the organic waste gas.
The 15-25cm honeycomb activated carbon is fixed in a thick round cake-shaped turntable bracket, the bracket can rotate along with a driving shaft to enable the honeycomb activated carbon adsorption turntable to alternately enter a third biochemical tank at the lower part for biochemical regeneration, and then returns to the upper part to continuously absorb organic waste gas. 2-5 groups of honeycomb activated carbon adsorption turntables can be designed according to needs, the pores face to the direction of air flow, and the part has small resistance and large adsorption capacity; the rotating speed of the adsorption turntable is adjustable between 5 and 120 revolutions per hour, so that the honeycomb activated carbon after adsorbing the organic waste gas has enough biochemical regeneration time in tank liquid or air; the third biochemical tank is matched with auxiliary facilities such as a circulating pump, a circulating pipe and the like, so that mass transfer and regeneration of liquid in pores of the honeycomb activated carbon are promoted, and pore blockage is reduced; parameters such as dissolved oxygen in the bath solution, nutrient solution components and the like can be determined, optimized and controlled in a centralized manner according to experiments.
Furthermore, the spraying liquid in the first spraying pipe is prepared into spraying activated carbon slurry by adopting powdered activated carbon with developed pore structure, large specific surface area and strong adsorption performance, so that the adsorption capacity of the spraying liquid on organic matters in the waste gas is improved, and the gas-liquid phase transfer of the organic waste gas is accelerated.
The embodiment of the utility model provides a have following advantage:
1. the device adopts the combined measures of activated carbon slurry spraying and washing biochemical degradation, modified PVC corrugated plate rotating disc absorption degradation, honeycomb activated carbon adsorption rotating disc adsorption biological regeneration and the like to realize economic, stable and efficient treatment of organic waste gas.
2. The length, solution parameters, spraying strength, circulation quantity parameters and the like of each section can be adjusted according to the concentration and component change of the organic waste gas, and the device has the capability of modular installation.
3. The structure is scientific, the arrangement is reasonable, and various organic compounds can be effectively removed from organic waste gas generated in the industries of petrifaction, coating, printing, rubber and the like.
Drawings
Fig. 1 is a schematic structural diagram of an organic waste gas biological treatment device provided in embodiment 1 of the present invention.
Wherein the reference numerals are:
1. an air inlet pipe; 2. a cover body; 3. a first shower pipe; 3', a second spray pipe; 4. a first baffle; 4', a second baffle; 4 ", a third baffle; 5. a first filler layer; 5', a second packing layer; 6. a PVC corrugated inclined tube filler layer; 7. a honeycomb activated carbon adsorption turntable; 8. a discharge pipe; 9. a drive shaft; 10. a first biochemical tank; 10' a second biochemical tank; 10', a third biochemical tank; 11. a first liquid outlet; 11', a second liquid outlet; 11 ", a third liquid outlet; 12. a tank body.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
Example 1
As shown in fig. 1, a schematic structural diagram of an organic waste gas biological treatment device provided by an embodiment of the present invention is shown.
The device comprises carbon powder slurry spraying washing and biochemical treatment equipment sections (3, 4, 5 ', 10), modified PVC corrugated plate rotary table sections (3', 4 ', 6', 10 ') and honeycomb activated carbon adsorption rotary table sections (4', 7, 10 "); a drive shaft 9; the device comprises a cover body 2 for controlling the flow direction of waste gas, a tank body 12, an air inlet pipe 1, a discharge pipe 8, an electrolyte monitoring system (not shown), an automatic dosing system (not shown) and the like. Organic waste gas enters the waste gas treatment device from the gas inlet pipe 1, and is mixed and absorbed in the semicircular packing layers 5 and 5' with fine liquid drop-shaped absorption media sprayed out from the nozzles of the spray pipe 3 when passing through the carbon powder slurry spray washing and biochemical degradation equipment section, and the organic waste gas is transferred from a gas phase to a liquid phase to realize primary absorption; the liquid drops carried to the packing layer 5 along with the waste gas collide with the modified PVC corrugated inclined tube packing layer 6 to be condensed into large liquid drops on the surface and flow back to the section of the tank body 10' (a second biochemical tank); an aeration system and a nutrient solution adding system are arranged in the first biochemical tank 10, the aeration rate is optimized according to debugging, and the nutrient solution is added according to debugging and testing; in addition, the first biochemical tank 10 is connected with auxiliary facilities (not shown) such as a matched spray liquid circulating pump (not shown) through the first liquid outlet 11, so that the flow rate of the spray liquid, the liquid circulating flow rate in the biochemical tank and gas-liquid mass transfer are ensured, and the biochemical efficiency is improved.
When organic waste gas after carbon slurry spraying and washing enters the modified PVC corrugated plate rotary table sections (3 ', 4', 6 ', 10'), the rotary table filler can increase microbial biomass, improve the organic waste gas adsorption treatment efficiency and reduce the phenomenon that the spray section carries water mist to the honeycomb activated carbon adsorption rotary table section. In addition, the second biochemical tank is connected with auxiliary facilities (not shown) such as a matched spray liquid circulating pump (not shown) and the like through the second liquid outlet 11', so that the flow of the spray liquid can be adjusted, the liquid circulating flow, the gas-liquid and solid-liquid mass transfer in the biochemical tank can be ensured, and the biochemical efficiency can be improved.
Organic waste gas in the modified PVC corrugated plate rotating disc section enters a honeycomb activated carbon adsorption rotating disc section, honeycomb activated carbon with the thickness of 15-25cm is fixed in a round cake-shaped support to form a honeycomb activated carbon adsorption rotating disc 7, the organic waste gas is adsorbed by honeycomb activated carbon filled in the honeycomb activated carbon adsorption rotating disc 7 when passing through, the rotating disc 7 adsorbing the organic waste gas slowly transfers into a lower groove body 12 (a third biochemical tank 10') under the action of a driving shaft 9, the organic matter degradation and activated carbon regeneration are realized through biodegradation and circulating stirring in the surface of the activated carbon and the third biochemical tank, the regenerated honeycomb activated carbon slowly rotates under the action of the driving shaft 9 to return to an upper cover body 2 to absorb the organic waste gas, 2-5 groups of honeycomb activated carbon adsorption rotating discs 7 are designed according to requirements, pores face to the air flow direction, the resistance of the part is small, and the adsorption capacity is large; the rotating speed of the adsorption rotary table 7 is 5-120 r/h adjustable, and the rotary table respectively adopts hydrophilic treatment and hydrophobic treatment according to different treatment gases so as to improve the adsorption efficiency of the organic waste gas. The third biochemical tank 10 'is connected with a matched tank liquid circulating pump through a third liquid outlet 11' to promote the mass transfer and regeneration of liquid in the pores of the honeycomb activated carbon; parameters such as dissolved oxygen, nutrients and the like in the bath solution can be determined, optimized and controlled in a centralized manner according to experiments.
The length, solution parameters, spraying strength, circulation flow, adsorption medium properties, materials and the like of each section of the equipment can be adjusted according to the concentration and component change of the organic waste gas, and the equipment has the capability of modular installation. The two ends of a driving shaft 9 for driving the honeycomb activated carbon adsorption rotary disc 7 penetrate through the shell, and the rotating speed can be adjusted under the driving of an external motor and a transmission system. The joint of each section of the cover body 2 for controlling the flow direction of the waste gas and the lower half part groove body 12 is sealed by a sealing gasket, so that air leakage is reduced; the guide plates 4, 4 'and 4' are arranged on the windward side of the first packing layer 5, the PVC corrugated inclined tube packing layer 6 and the honeycomb activated carbon adsorption rotary table 7, the guide plates protrude 5-10cm towards the driving shaft 9, and the distance between the guide plates and the packing layers 5, 6 and the rotary table 7 behind the guide plates is less than 5cm, so that the waste gas is prevented from short flow and ineffective adsorption along the gap of the cover wall.
The activated carbon slurry adopted by the utility model is sprayed and washed, and the adsorption medium does not limit the components of the activated carbon powder, and inorganic adsorption media such as activated alumina powder, zeolite powder, diatomite powder and the like with the particle size meeting the spraying and adsorption requirements can also be used; other absorption towers that are applicable to liquid-liquid exchange commonly used are also applicable to the utility model discloses. The adsorption medium of the runner honeycomb activated carbon adsorption and biochemical equipment section is not limited to honeycomb activated carbon, and other porous adsorption media with low wind resistance and stable physicochemical properties can also be used for the turntable packing. Meanwhile, the utility model can adopt strengthening measures to improve the efficiency of the biochemical tank without being limited to ultrasonic strengthening.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides an organic waste gas biological treatment device, a serial communication port, the device sprays washing section, modified PVC buckled plate carousel section and honeycomb active carbon adsorption carousel section including connecting gradually around, and the aforesaid sprays washing section, modified PVC buckled plate carousel section and honeycomb active carbon adsorption carousel section and all installs in the casing of compriseing lower part cell body and upper portion cover body, wherein
The spraying washing section comprises a first unit and a first biochemical tank, wherein the first unit and the first biochemical tank are arranged in the upper cover body in a front-back mode, and the first unit comprises a first spraying pipe and a first packing layer which are arranged in a front-back mode; the modified PVC corrugated plate rotary table section comprises an upper cover body and a second biochemical tank at the lower part, and the second unit comprises a second spray pipe and a modified PVC corrugated plate packing layer which are sequentially arranged from front to back; the honeycomb activated carbon adsorption rotary table section comprises a third unit and a third biochemical tank, wherein the third unit and the third biochemical tank are arranged in the upper cover body in a front-back manner; modified PVC buckled plate carousel and honeycomb active carbon adsorption carousel pass the centre of a circle by the drive shaft and connect in series and drive the rotation, the drive shaft stretches out from one side casing at least.
2. The organic waste gas biological treatment device according to claim 1, wherein the two parameters of dissolved oxygen amount, retention time and stirring mode which are independently controlled and connected at the inner top part of the first biochemical tank meet the requirement of optimization control of microbial metabolism conditions; the modified PVC corrugated plate rotary table is provided with a spray pipe in the air inlet direction, and the spray amount is adjusted according to the requirement of the filler.
3. The organic waste gas biological treatment device according to claim 1, wherein each first unit is further provided with a first guide plate between the first spray pipe and the first packing layer; each second unit is also provided with a second guide plate between the second spray pipe and the second packing layer; and a third guide plate is arranged in front of the first honeycomb activated carbon adsorption rotary disc section, so that the short flow of the waste gas along the cover body is avoided.
4. The organic waste gas biological treatment device according to claim 3, wherein the joint of the upper cover body and the lower tank body is sealed by a sealing gasket; the guide plate radially protrudes by 5-10cm relative to the later filler layer or the honeycomb activated carbon adsorption turntable; and the distance between the guide plate and the subsequent filler layer or the honeycomb activated carbon adsorption rotating disc is less than 5 cm.
5. The organic waste gas biological treatment device according to claim 1, wherein the first biochemical tank, the second biochemical tank and the third biochemical tank are square tanks, the external tank body expands the biomass and the treatment rate of the biochemical tanks, the external tanks are connected in sequence, and the internal tanks are mutually independent; the upper cover body is communicated with the inside of the spraying washing section, the modified PVC corrugated plate rotary table section and the honeycomb activated carbon adsorption rotary table section, the cross section of the upper cover body is semicircular, the front end of the cover body is connected with an air inlet pipe, and the rear end of the cover body is connected with a discharge pipe.
6. The organic waste gas biological treatment device according to claim 5, wherein a partition board is arranged in the first biochemical tank to divide the biochemical tank into two parts, the upper parts of the two parts are connected through an overflow port, the aeration quantity can be independently adjusted by laying an aeration disc at the bottom, and the inlet of the spray pump is connected with the bottom of the two-stage biochemical tank and can adjust the liquid inlet quantity through a valve; an aeration disc is arranged in the second biochemical tank, and the tank is externally connected with an independent circulating spray pump; an aeration disc and a circulating stirring pipe are arranged in the third biochemical tank.
7. The organic waste gas biological treatment device according to claim 6, wherein the bottoms of the first biochemical tank, the second biochemical tank and the third biochemical tank are respectively provided with a first liquid outlet, a second liquid outlet, a third liquid outlet and a fourth liquid outlet which are used for connecting a liquid circulating pump, and the flow rates of the first liquid outlet and the second liquid outlet can be adjusted through valves; the outlet of the liquid circulating pump is in butt joint with the inlet of the spraying pipe and/or the circulating stirring pipe in the biochemical tank.
8. The organic waste gas bioremediation device of claim 1, wherein a transmission system is further coupled to a side of the drive shaft extending out of the housing; the first biochemical tank, the second biochemical tank and the third biochemical tank are respectively connected with a dissolved oxygen monitoring system and a nutrient solution dosing system.
9. The organic waste gas biological treatment device according to claim 1, wherein the honeycomb activated carbon adsorption rotating disc is 15-25cm thick, 2-5 in number, and 5-120 rpm, and the rotating disc is respectively subjected to hydrophilic treatment and hydrophobic treatment according to different treatment gases so as to improve the organic waste gas adsorption efficiency.
10. The organic waste gas biological treatment device according to claim 1, wherein the medium added to the spray liquid in the first biochemical tank for improving the adsorption and absorption effects of the organic waste gas is activated carbon powder or diatomite powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920862189.3U CN210874826U (en) | 2019-06-10 | 2019-06-10 | Organic waste gas rotating biological disk administers device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920862189.3U CN210874826U (en) | 2019-06-10 | 2019-06-10 | Organic waste gas rotating biological disk administers device |
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| CN210874826U true CN210874826U (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113521959A (en) * | 2021-07-28 | 2021-10-22 | 王秀梅 | Formaldehyde elimination instrument |
-
2019
- 2019-06-10 CN CN201920862189.3U patent/CN210874826U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113521959A (en) * | 2021-07-28 | 2021-10-22 | 王秀梅 | Formaldehyde elimination instrument |
| CN113521959B (en) * | 2021-07-28 | 2023-11-03 | 王秀梅 | Formaldehyde scavenging instrument |
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