CN202343094U - Waste gas treatment biological carrier with self-rotating function - Google Patents
Waste gas treatment biological carrier with self-rotating function Download PDFInfo
- Publication number
- CN202343094U CN202343094U CN2011204395933U CN201120439593U CN202343094U CN 202343094 U CN202343094 U CN 202343094U CN 2011204395933 U CN2011204395933 U CN 2011204395933U CN 201120439593 U CN201120439593 U CN 201120439593U CN 202343094 U CN202343094 U CN 202343094U
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- Prior art keywords
- support frame
- rotating shaft
- spherical support
- rib
- filler
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- Expired - Lifetime
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- 239000002912 waste gas Substances 0.000 title claims abstract description 17
- 238000012856 packing Methods 0.000 claims abstract description 16
- 239000000945 filler Substances 0.000 claims description 51
- 244000005700 microbiome Species 0.000 claims description 12
- 210000001503 joint Anatomy 0.000 claims description 4
- 239000000463 material Substances 0.000 claims 3
- 238000000746 purification Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000969 carrier Substances 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000032770 biofilm formation Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000005660 hydrophilic surface Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
The utility model relates to the field of carriers and aims to provide a waste gas treatment biological carrier with a self-rotating function. The carrier comprises a spherical support frame and a hollow polyhedral sphere; the spherical support frame is composed of two semi-spherical surfaces which are butted; each semi-spherical surface comprises a plurality of staggered warp ribs and weft ribs; the hollow polyhedral sphere comprises a rotating shaft and a plurality of semicircular blades fixed on the rotating shaft through straight edges; the two ends of the rotating shaft are arranged in rotating shaft sleeves of the spherical support frame; and the hollow polyhedral sphere can rotate freely in the spherical support frame. According to the utility model, microbes can be grown and distributed on the surface of the carrier advantageously, so that the number of microbes carried on the carrier per volume can be improved, and the waste gas purification efficiency and the load can be increased; an aged biological film can be prompted to drop off in time to be taken away by circulating water from clearances of the carrier, so that short circuit or blockage of a packing layer can be avoided; and the specific surface area and the voidage of the carrier are large enough, so that surfaces and spaces required by growth of microbes can be ensured.
Description
Technical Field
The utility model relates to a filler for a waste gas biological treatment device, in particular to a filler for a waste gas biological trickling filter device.
Background
Compared with physical and chemical adsorption methods, the biological treatment technology for waste gas is generally recognized as low in treatment cost and small in secondary pollution. In recent years, this technology has been extensively studied and used for engineering on a certain scale.
The biological trickling filtration method has the advantages of large biomass, easy control of operation conditions and the like, and is a high-efficiency biological treatment technology for waste gas. The biofilm filler is a carrier for microorganism adhesion and substance transfer in the biological trickling filter device, and the performance of the biofilm filler directly influences the exhaust gas purification effect.
The packing is heavier and has higher requirement on the structural strength of the bioreactor, and the manufacturing cost of the waste gas treatment device can be increased. The instability of the physical and chemical properties of the filler can cause frequent replacement during operation and possible secondary pollution. The specific surface area of the filler and its surface roughness are directly related to the biomass to which it is attached. The porosity of the filler directly influences the resistance drop of the filler layer. When the amount of microorganisms loaded on the filler per unit volume is too small, the waste gas purification efficiency and the pollutant removal load are low; when the packing microorganism is excessively accumulated to cause blockage, the internal resistance of the bioreactor is reduced and increased, the operation energy consumption is increased, the pollutant removal rate is reduced, and even the whole device is in a paralysis state. Therefore, the ideal biological filler not only meets the general requirements of small stacking density, stable physicochemical property, large specific surface area and porosity, easy microbial biofilm formation and the like, but also has a reasonable space structure, is convenient for the aged and fallen biological membranes to be discharged from the filler gaps along with spray water in time, and avoids the blockage of the filler layer caused by excessive accumulation of the biological membranes.
The traditional biological filler mainly comprises ceramsite, volcanic rock, granular activated carbon, coal cinder, common chemical fillers such as Raschig rings and pall rings, and tends to be eliminated or used less singly due to the defects of overlarge specific gravity, low strength, small void ratio and the like. The biological fillers of Chinese patent 200620107863, X, 200820170724.0, etc. have a great improvement on the space structure of the fillers. However, the packing is static, and due to the contact and cross phenomena between the packing, the bias flow and channeling of gas and liquid are inevitable, and even part of the packing can not be fully wetted in severe cases. The water and nutrient media obtained from each part of the filler are different, so that microorganisms are accumulated excessively at local parts, and short circuit or blockage is easy to occur under the condition of high pollutant load or long-term operation.
Therefore, the efficient biological filler is further developed, and has higher engineering due value.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to overcome the not enough among the prior art, provide a waste gas treatment biofilm carrier with spin function. For solving the technical problem, the utility model discloses a solution is:
the waste gas treatment biological filler with the self-rotating function comprises a blade for carrying microorganisms, wherein the blade is semicircular in shape; the filler consists of a spherical support frame and a hollow polyhedral sphere; wherein,
the spherical support frame is formed by butting two semispherical surfaces, and each semispherical surface consists of a plurality of staggered warp ribs and weft ribs; the joint of the two hemispheroids forms an equatorial rib of the spherical support frame, and a latitude rib at the top of each hemispheroid forms a rotating shaft sleeve; one end of the semi-spherical warp rib is connected with the equatorial rib, and the other end is intersected with the hemispherical weft rib;
the hollow polyhedral sphere consists of a rotating shaft and a plurality of blades which are fixed on the rotating shaft by straight edges, the blades are uniformly distributed in a divergent shape by taking the rotating shaft as a center, and adjacent blades form a grid unit;
two ends of the rotating shaft of the hollow polyhedral sphere are arranged in the rotating shaft sleeves at the two hemispherical surface vertexes of the spherical support frame, and the hollow polyhedral sphere can freely rotate in the spherical support frame.
As an improvement, the warp ribs of the hemispherical surface are uniformly distributed.
As an improvement, at least one weft rib is arranged between the weft rib at the top point of the hemispherical surface and the equator rib.
As an improvement, the warp ribs on the two butted hemispherical surfaces are arranged in a mutually staggered manner.
As an improvement, the surface of the blade is provided with wavy or reticular lines or uniformly distributed with convex points, burrs or depressed parts.
As an improvement, the inner diameter of the spherical support frame is 25-200 mm, and after the spherical support frame and the hollow multi-surface sphere are combined, the gap between the spherical support frame and the hollow multi-surface sphere is 0.5-10 mm.
As an improvement, 1-3 weft ribs and 4-10 warp ribs are arranged on the hemispherical surface.
As an improvement, the number of the blades is 5-12, and the thickness of the blades is 0.5-2 mm.
As an improvement, the outer diameter of the end part of the rotating shaft is 0.5-5 mm, and the clearance between the rotating shaft sleeve and the rotating shaft is 0.2-1.5 mm.
As an improvement, the straight edge of each blade and the rotating shaft form an inclination angle of 3-15 degrees.
The filler in the utility model can be a single body composed of a spherical support frame and a hollow polyhedral sphere, and can also be a whole formed by arranging and fixing a plurality of single bodies according to a certain mode. The filler is made of high polymer synthetic materials such as PP, PE, PVC and the like or a mixture thereof; the surface of the blade is modified by hydrophilicity.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the blades can make the hollow polyhedral sphere rotate freely under the push of gas and liquid flow, and the humidity and nutrition conditions of each part of the filler are basically consistent, so that the uniform growth and distribution of microorganisms on the surface of the filler are facilitated, and the microbial load, the waste gas purification efficiency and the load of the filler in unit volume are further facilitated to be improved.
(2) The rotation of the hollow polyhedral sphere and the scouring of gas and liquid strengthen the shearing and friction of the biomembrane, so that the aged biomembrane is timely fallen off and taken away from the filler gap along with circulating water, and the short circuit or blockage of the filler layer is avoided.
(3) Has a large enough specific surface area and void ratio to ensure the surface and space required by the growth of microorganisms; the rough and hydrophilic surface improves the affinity with microorganisms and is suitable for the rapid mass attachment of microorganisms; the hollow and divergent blade structure provides good gas-liquid mass transfer performance, and is beneficial to reducing resistance and discharging fallen biological membranes.
Drawings
FIG. 1 is a schematic structural view of a spin-functional exhaust gas bio-packing;
FIG. 2 is a schematic view of a spin-functional exhaust gas bio-packing structure;
FIG. 3 is a top view of a spin-functional exhaust gas bio-filler vane;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of the connection of the rotating shaft to the blade.
Fig. 6 is a right side view of the structure shown in fig. 5.
The reference numbers in the figures are: the spherical support frame 1, the hollow polyhedral sphere 2, the equator rib 3 and the weft rib 4 are butted to form the weft rib of the equator rib, the rotary shaft sleeve 6, the warp rib 7, the rotary shaft 8, the blade 9 and the grid unit 10.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The utility model provides a waste gas treatment biofilm carrier with spin function comprises spherical support frame 1 and hollow many face spheroid 2, and hollow many face spheroid 2 can be in spherical support frame 1 free rotation. The spherical support frame 1 is formed by butt joint of hemispherical surfaces formed by a plurality of same staggered ribs, and an equator rib 3 of a spherical surface is formed at the butt joint position. The two hemispherical surfaces can be connected in a bonding, welding or cross-connecting mode, and the warp ribs on the two hemispherical surfaces are arranged in a staggered mode after butt joint. A plurality of warp ribs 7 are uniformly distributed on the hemispherical surface, one end of each warp rib 7 is connected with the equator rib 3, and the vertexes of the other ends of the warp ribs are converged with the weft ribs at the vertexes of the sphere. The top weft ribs of the sphere form the rotating shaft sleeve 6. One or more weft ribs 7 are arranged between the vertex weft rib (the rotary shaft sleeve 6) and the equator rib 5 on the hemispherical surface, and the weft ribs 7 are connected with the weft ribs 4 and the equator rib 3 into a whole. The hollow polyhedral sphere 2 is formed by enclosing a plurality of semicircular blades 9 which are uniformly distributed around a rotating shaft 8 in a divergent mode, and adjacent blades form a grid unit 10. The blades 9 are integrally connected to the rotary shaft 8. Two top ends of the rotating shaft 8 are arranged in the rotating shaft sleeve 6 of the spherical support frame 1, and the hollow multi-surface sphere 2 can freely rotate in the spherical support frame 1.
In this embodiment, after the spherical support frame 1 and the hollow multi-surface sphere 2 are combined, the inner diameter of the spherical support frame is 25mm, the outer diameter of the hollow multi-surface sphere is 23mm, a gap of 1mm is formed between the spherical support frame and the hollow multi-surface sphere, the diameter of the end of the rotating shaft is 1mm, the diameter of the rotating shaft in the rotating shaft sleeve is 1.5mm, a gap of 0.25mm is formed between the rotating shaft sleeve and the hollow multi-surface sphere, and the hollow multi-.
In the embodiment, 6 warp ribs are arranged on the hemispherical support frame, and 4-10 warp ribs are recommended; 1 weft is arranged on the hemispherical support frame, and certainly, a plurality of wefts can be arranged on the hemispherical support frame; the two hemispherical support frames are arranged in a staggered manner by the warp ribs at a staggered angle of 30 degrees, and other angles can be adopted; the blades 9 and the rotating shaft 8 are uniformly distributed at an inclination angle of 5 degrees, and 3-15 degrees is recommended; the diameter of the middle part of the rotating shaft 8 is 2mm, the end part of the rotating shaft is directly 1mm, and the length is 27 mm; the semicircular blades 9 have a diameter of 23mm, a thickness of 1.5mm thin sheets, and a number of 6, preferably 5 to 12 sheets.
In this embodiment, the surface of the blade 9 is modified by hydrophilicity and is provided with wavy lines, which may be mesh lines, or even bumps, burrs, recesses, and the like.
In this embodiment, the filler is made of PP, but polymer synthetic materials such as PE and PVC, or a mixture thereof may also be used.
The following is a comparison of the static biofilm carrier and the packing test of the present invention.
And (3) parallel test: a set of 1 group and 2 sets of a biological trickling filter bed device of a transparent organic glass tower with the diameter of 200mm and the height of 800mm are established, 2 fillers of a corrugated wing polyhedral ball and a rotation polyhedral ball with the specification of Dg25 are respectively installed in the tower, the height of a filler layer is 500mm, 2 towers run in parallel, and the process conditions of air inlet load, nutrient solution spraying and the like are the same.
The test is carried out to treat the mixed waste gas of benzene and toluene with the treatment flow of 2 multiplied by 1.5m3The waste gas enters a biological trickling filter from the bottom of the tower, nutrient solution is sprayed from the top of the tower, and the gas and the liquid run in a countercurrent way, wherein the benzene concentration is 324-438 mg/m3The concentration of toluene is 242-374 mg/m3And 6 months of continuous operation, the result shows, rotation polyhedral ball compare with static line wing polyhedral ball, when reaching the biofilm formation steady operation, can adhere to more microorganism volume and pack surface biofilm thickness evenly to gain better treatment effect.
In the later stage of test operation (after 4 months), slight blockage occurs in the biotrickling filter provided with the corrugated wing polyhedral ball filler, the upper biological film of the filler is thicker, the lower part of the filler is thinner, the thickness of the biological film on the surface of the autorotation polyhedral ball filler is uniform, the filler layer keeps low resistance reduction, and the treatment effect is obviously better than that of the biotrickling filter provided with the corrugated wing polyhedral ball filler.
The filler specifications and specific test data are shown in table 1.
TABLE 1 Filler Specification and test data sheet
The specific surface area of the corrugated-wing multi-surface sphere filler is larger than that of the spinning multi-surface sphere filler, and the biomass in the stabilization period is obviously lower than that of the spinning multi-surface sphere filler, so that the advantage of the large specific surface area of the corrugated-wing multi-surface sphere filler is not fully exerted.
In the actual engineering operation, the specification of the spin multi-surface ball filler is enlarged and is generally phi 50 mm-phi 150 mm.
It can be seen from the above examples that the utility model discloses a biological treatment filler with spin function, it is big to have specific surface area, the porosity is high, the resistance reduces, unit volume microorganism attachment is big, filler surface biofilm thickness is even, long-term operation is difficult for characteristics such as jam, so pollutant removal efficiency and load are all higher, are suitable for waste gas biological treatment system, and application prospect is wide.
Claims (10)
1. A waste gas treatment biological filler with a self-rotating function comprises a blade for carrying microorganisms, and is characterized in that the blade is semicircular in shape;
the filler consists of a spherical support frame and a hollow polyhedral sphere; wherein,
the spherical support frame is formed by butting two semispherical surfaces, and each semispherical surface consists of a plurality of staggered warp ribs and weft ribs; the joint of the two hemispheroids forms an equatorial rib of the spherical support frame, and a latitude rib at the top of each hemispheroid forms a rotating shaft sleeve; one end of the semi-spherical warp rib is connected with the equatorial rib, and the other end is intersected with the hemispherical weft rib;
the hollow polyhedral sphere consists of a rotating shaft and a plurality of blades which are fixed on the rotating shaft by straight edges, the blades are uniformly distributed in a divergent shape by taking the rotating shaft as a center, and adjacent blades form a grid unit;
two ends of the rotating shaft of the hollow polyhedral sphere are arranged in the rotating shaft sleeves at the two hemispherical surface vertexes of the spherical support frame, and the hollow polyhedral sphere can freely rotate in the spherical support frame.
2. The packing of claim 1 wherein the hemispherical warp ribs are uniformly distributed.
3. The packing material of claim 1, wherein at least one latitudinal rib is arranged between the latitudinal rib and the equatorial rib at the upper vertex of the hemispherical surface.
4. The packing material of claim 1, wherein the warp ribs on the two half-spheres after butt joint are arranged in a staggered manner.
5. The packing according to claim 1, wherein the surface of the blade is provided with wavy or reticular lines or uniformly distributed with convex points, burrs or concave parts.
6. The filler according to claim 1, wherein the inner diameter of the spherical support frame is 25-200 mm, and the clearance between the spherical support frame and the hollow multi-face sphere is 0.5-10 mm after the spherical support frame and the hollow multi-face sphere are combined.
7. The filler according to claim 1, wherein the number of the weft ribs on the hemispherical surface is 1 to 3, and the number of the warp ribs on the hemispherical surface is 4 to 10.
8. The packing material according to claim 1, wherein the number of the blades is 5 to 12, and the thickness of the blades is 0.5 to 2 mm.
9. The packing according to claim 1, wherein the outer diameter of the end of the rotating shaft is 0.5 to 5mm, and the clearance between the rotating sleeve and the rotating shaft is 0.2 to 1.5 mm.
10. The packing of claim 1, wherein the straight edges of the vanes are inclined at an angle of 3 to 15 ° with respect to the axis of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204395933U CN202343094U (en) | 2011-11-08 | 2011-11-08 | Waste gas treatment biological carrier with self-rotating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204395933U CN202343094U (en) | 2011-11-08 | 2011-11-08 | Waste gas treatment biological carrier with self-rotating function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202343094U true CN202343094U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204395933U Expired - Lifetime CN202343094U (en) | 2011-11-08 | 2011-11-08 | Waste gas treatment biological carrier with self-rotating function |
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| Country | Link |
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| CN (1) | CN202343094U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430334A (en) * | 2011-11-08 | 2012-05-02 | 浙江工业大学 | Biological filler with self-rotating function for waste gas treatment |
| CN105800774A (en) * | 2016-05-19 | 2016-07-27 | 湖南正源金山环境工程股份有限公司 | Biomembrane process packing ball |
| CN107930378A (en) * | 2017-11-17 | 2018-04-20 | 北京沃太斯环保科技发展有限公司 | For handling the filtering tower packing of VOCs gases and foul gas |
| CN109876645A (en) * | 2019-03-31 | 2019-06-14 | 叶耀 | A kind of biological deodorizing device of the anti-depths anoxic corruption of the warm and humid profit of discontinuous |
| CN114225887A (en) * | 2021-12-17 | 2022-03-25 | 萍乡市天盛化工设备有限公司 | Novel metal garland filler |
-
2011
- 2011-11-08 CN CN2011204395933U patent/CN202343094U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430334A (en) * | 2011-11-08 | 2012-05-02 | 浙江工业大学 | Biological filler with self-rotating function for waste gas treatment |
| CN105800774A (en) * | 2016-05-19 | 2016-07-27 | 湖南正源金山环境工程股份有限公司 | Biomembrane process packing ball |
| CN105800774B (en) * | 2016-05-19 | 2019-02-01 | 湖南正源金山水务有限公司 | A kind of biofilm filling ball |
| CN107930378A (en) * | 2017-11-17 | 2018-04-20 | 北京沃太斯环保科技发展有限公司 | For handling the filtering tower packing of VOCs gases and foul gas |
| CN109876645A (en) * | 2019-03-31 | 2019-06-14 | 叶耀 | A kind of biological deodorizing device of the anti-depths anoxic corruption of the warm and humid profit of discontinuous |
| CN114225887A (en) * | 2021-12-17 | 2022-03-25 | 萍乡市天盛化工设备有限公司 | Novel metal garland filler |
| CN114225887B (en) * | 2021-12-17 | 2024-02-06 | 萍乡市天盛化工设备有限公司 | Novel metal flower ring filler |
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Granted publication date: 20120725 |
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