CN203764131U - Biological-spraying combined deodorization device for removing stink - Google Patents
Biological-spraying combined deodorization device for removing stink Download PDFInfo
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- CN203764131U CN203764131U CN201320880597.4U CN201320880597U CN203764131U CN 203764131 U CN203764131 U CN 203764131U CN 201320880597 U CN201320880597 U CN 201320880597U CN 203764131 U CN203764131 U CN 203764131U
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- spraying
- pickle
- nutrient solution
- wash water
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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
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Abstract
The utility model relates to a deodorization device, in particular to a biological-spraying combined deodorization device for removing stink. The biological-spraying combined deodorization device comprises a biotrickling deodorization device and a spraying deodorization device, wherein a stink inlet is connected with the biotrickling deodorization device, and exhaust opening of the biotrickling deodorization device is connected with the spraying device. The biological-spraying combined deodorization device has the benefits that a biological method is adopted to quickly remove most stink, and the investment cost of the biological method is low; then, the rest of stink is removed by adopting a spraying method, the dwelling time of stink is short, the dosage of chemical agents is small, and the operating cost is low. The biological-spraying combined deodorization device integrates the advantages of the biological method and the spraying method and has significant advantages in terms of the investment cost and operating cost.
Description
Technical field
The utility model relates to odor removal, relates in particular to a kind of biology-spraying combination odor removal of removing foul smell.
Background technology
Sewage treatment plant's foul smell mainly contains hydrogen sulfide and ammonia.Factory's circle toxic emission primary standard of " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) regulation is ammonia 1.0 mg/m
3, hydrogen sulfide 0.03 mg/m
3.
At present, main treatment technology has Physical, chemical method and bioanalysis.Physical refers in the situation that not changing odorant essence, a kind of method of stink being sheltered, being diluted or shifting by physical means, and common physical method has dilution method, masking method, WATER-WASHING METHOD and absorption method.Chemical method is mainly to utilize chemical mediator and foul smell generation chemical reaction, thereby the chemical property of change foul smell reaches the object of deodorizing, and conventional chemical deodorizing method has chemical absorption method, chemical oxidization method and combustion method etc.First bioanalysis refers to cultivates microorganism on support substance, then utilizes its metabolism foul smell of degrading, and then reaches a kind of method of deodorizing object, and biological odor removal method mainly contains biological washing method, biological filter process and biofiltration process at present.
Traditional sewage treatment plant's deodorization process all has some limitations, and in Physical, it is more difficult up to standard that dilution method and WATER-WASHING METHOD are processed foul smell, and investment and the operating cost of absorption method are higher; In chemical method, chemical absorption method reagent cost is higher, the energy consumption of Ozonation is higher, and therefore the operating cost of chemical method is relatively high.In traditional bioanalysis, hydrogen sulfide is degraded rapidly in packing layer, and 10% packing layer can be removed more than 90% hydrogen sulfide gas, but will reach cleanup standard, the hydrogen sulfide gas that also needs the packing layer removal residue approximately 10% of utilizing 90%, cost of investment is higher.
Summary of the invention
In order to solve the problems of the prior art, the utility model provides a kind of biology-spraying combination odor removal of removing foul smell.
The utility model provides a kind of biology-spraying combination odor removal of removing foul smell, comprise bio-filtration deodorization device and spray deodorizer, wherein, the air inlet of described foul smell is connected with described bio-filtration deodorization device, and the exhaust outlet of described bio-filtration deodorization device is connected with described spray deodorizer.
As further improvement of the utility model, described bio-filtration deodorization device comprises bio-filtration deodorization container and nutrient solution cycling mechanism, the bottom of described bio-filtration deodorization container is connected with the air inlet of described foul smell, the top of described bio-filtration deodorization container is provided with nutrient solution shower nozzle, the drain apparatus of described nutrient solution cycling mechanism is connected with described nutrient solution shower nozzle, and the inlet of described nutrient solution cycling mechanism is connected with the bottom of described bio-filtration deodorization container.
As further improvement of the utility model, described bio-filtration deodorization container is bio-filtration deodorization post, in described bio-filtration deodorization container, is provided with inert filler, and described inert filler selects granular activated carbon as microbe carrier.
As further improvement of the utility model, described nutrient solution cycling mechanism comprises nutrient solution circulation liquid bath and nutrient solution compression pump, described nutrient solution circulation liquid bath is connected with the bottom of described bio-filtration deodorization container by pipeline, the inlet of described nutrient solution compression pump is connected with nutrient solution liquid suction pipe, the liquid pumping hole of described nutrient solution liquid suction pipe is positioned at described nutrient solution circulation liquid bath, and the leakage fluid dram of described nutrient solution compression pump is connected with described nutrient solution shower nozzle by pipeline.
As further improvement of the utility model, described sprayer unit comprises spray acid cleaning device and spraying alkaline cleaner, the exhaust outlet of described bio-filtration deodorization device is connected with described spray acid cleaning device, and the exhaust outlet of described spray acid cleaning device is connected with described spraying alkaline cleaner.
As further improvement of the utility model, described spray acid cleaning device comprises spray acid cleaning container and pickle cycling mechanism, the bottom of described spray acid cleaning container is connected with the exhaust outlet of described bio-filtration deodorization device, the top of described spray acid cleaning container is provided with pickle atomizer, the drain apparatus of described pickle cycling mechanism is connected with described pickle atomizer, and the inlet of described pickle cycling mechanism is connected with the bottom of described spray acid cleaning container.
As further improvement of the utility model, described spray acid cleaning container is spray acid cleaning post.
As further improvement of the utility model, described pickle cycling mechanism comprises pickle circulation liquid bath and pickle compression pump, described pickle circulation liquid bath is connected with the top of described spray acid cleaning container by pipeline, the inlet of described pickle compression pump is connected with pickle liquid suction pipe, the liquid pumping hole of described pickle liquid suction pipe is positioned at described pickle circulation liquid bath, and the leakage fluid dram of described pickle compression pump is connected with described pickle atomizer by pipeline.
As further improvement of the utility model, described spraying alkaline cleaner comprises spraying alkali cleaning container and alkali wash water cycling mechanism, the bottom of described spraying alkali cleaning container is connected with the exhaust outlet of described spray acid cleaning device, the top of described spraying alkali cleaning container is provided with alkali wash water atomizer, the drain apparatus of described alkali wash water cycling mechanism is connected with described alkali wash water atomizer, and the inlet of described alkali wash water cycling mechanism is connected with the bottom of described spraying alkali cleaning container.
As further improvement of the utility model, described spraying alkali cleaning container is spraying alkali cleaning post.
As further improvement of the utility model, described alkali wash water cycling mechanism comprises alkali wash water circulation liquid bath and alkali wash water compression pump, described alkali wash water circulation liquid bath is connected with the bottom of described spraying alkali cleaning container by pipeline, the inlet of described alkali wash water compression pump is connected with alkali wash water liquid suction pipe, the liquid pumping hole of described alkali wash water liquid suction pipe is positioned at described alkali wash water circulation liquid bath, and the leakage fluid dram of described alkali wash water compression pump is connected with described alkali wash water atomizer by pipeline.
The invention has the beneficial effects as follows: by such scheme, can reduce by a relatively large margin investment and operating cost.Under normal circumstances, in sewage plant bad smell, concentration of hydrogen sulfide is less than 10mg/m
3, ammonia concentration is less than 5mg/m
3, adopt such scheme, first use bio-trickling method, the time of staying only needs 3s, can remove ammonia more than 90 ~ 95% hydrogen sulfide gas and 80%, and gas outlet concentration of hydrogen sulfide is less than 1.0mg/m
3, and ammonia concentration has been less than 1mg/m
3, reached factory's circle toxic emission primary standard that " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) specifies; Then adopt spray-on process spray alkali lye to remove remaining hydrogen sulfide, the particle diameter of mist is little, and specific area is large, can be suspended in air, the time of contact of increase and foul smell, raising mass-transfer efficiency, the time of staying only needs 1s can remain the removal of hydrogen sulfide, reaches aforementioned primary standard.Benefit of the present invention shows, on the one hand, the bio-trickling container time of staying is short, is only 10 ~ 20% times of traditional biological method, and the time of staying of automiser spray is very short, and structure is very simple, inner without filler, therefore can reduce by a relatively large margin on the whole investment; On the other hand, because the bio-trickling filter time of staying is short, filtering layer can significantly reduce, pressure drop decreases, air blast power consumption is also minimized, in addition, and because more than 90% hydrogen sulfide gas is removed by bioanalysis, spray the amount of required alkali lye (NaOH) less than 10% of conventional chemical method, and operating cost also significantly reduces on the whole.
Under a few cases, when Sewage Plant ammonia concentration is higher than 5mg/m
3time, needing to increase spray acid mist so that guarantee ammonia concentration is up to standard, the time of staying of spray acid cleaning deodorant holder is about 5 ~ 10s.Although the time of staying increases on the whole, spray acid cleaning deodorant holder internal structure is simple, and spray amount is few, and investment and operating cost still have obvious advantage.
Brief description of the drawings
Fig. 1 is the structural representation of biology-spraying combination odor removal of the utility model removal foul smell.
Detailed description of the invention
Below in conjunction with brief description of the drawings and detailed description of the invention, the utility model is further illustrated.
Drawing reference numeral in Fig. 1 is: air inlet 1; Bio-filtration deodorization container 21; Nutrient solution shower nozzle 211; Nutrient solution circulation liquid bath 22; Nutrient solution compression pump 23; Spray acid cleaning container 31; Pickle atomizer 311; Pickle circulation liquid bath 32; Pickle compression pump 33; Spraying alkali cleaning container 41; Alkali wash water atomizer 411; Alkali wash water circulation liquid bath 42; Alkali wash water compression pump 43; Exhaust outlet 5.
Biology-spraying combination deodorization process of removing foul smell, comprises the following steps:
S1, foul smell is carried out to the deodorizing of bio-trickling method;
S2, to the deodorizing of spraying of the foul smell after bio-filtration deodorization.
As shown in Figure 1, step S1 is specially: foul smell is injected to the bottom of bio-filtration deodorization container 21, foul smell is spread from bottom to top in the inside of bio-filtration deodorization container 21, complete the processing of foul smell by biodegradation.At the top spray nutrient solution of bio-filtration deodorization container 21, for microbial growth provides enough nutriments, increase the humidity of filler simultaneously, nutrient solution spreads from top to bottom in the inside of bio-filtration deodorization container 21, and described bio-filtration deodorization container 21 recycles nutrient solution by nutrient solution cycling mechanism.
Step S2 specifically comprises following sub-step:
S201, the foul smell after bio-filtration deodorization is carried out to spray acid cleaning deodorizing;
S202, to the alkali cleaning deodorizing of spraying of the foul smell after spray acid cleaning deodorizing.
As shown in Figure 1, step 201 is specially: by the bottom of the foul smell spray injection pickling container 31 after bio-filtration deodorization, foul smell after bio-filtration deodorization is spread from bottom to top in the inside of spray acid cleaning container 31, adopt the pickle of spray-on process spray atomizing at the top of spray acid cleaning container 31, pickle is spread from top to bottom in the inside of spray acid cleaning container 31, foul smell reaches removal effect with reverse contact of pickle, and described spray acid cleaning container 31 recycles pickle by pickle cycling mechanism.
As shown in Figure 1, step 202 is specially: by the bottom of the foul smell spray injection alkali cleaning container 41 after spray acid cleaning, foul smell after spray acid cleaning is spread from bottom to top in the inside of spraying alkali cleaning container 41, adopt the alkali wash water of spray-on process spray atomizing at the top of spraying alkali cleaning container 41, alkali wash water is spread from top to bottom in the inside of spraying alkali cleaning container 41, foul smell reaches removal effect with reverse contact of alkali wash water, and described spraying alkali cleaning container 41 recycles alkali wash water by alkali wash water cycling mechanism.
As shown in Figure 1, the utility model also provides a kind of biology-spraying combination odor removal of removing foul smell, comprise bio-filtration deodorization device and spray deodorizer, the air inlet of wherein said foul smell is connected with bio-filtration deodorization device, and the exhaust outlet of described bio-filtration deodorization device is connected with described sprayer unit.
As shown in Figure 1, described bio-filtration deodorization device comprises bio-filtration deodorization container 21 and nutrient solution cycling mechanism, the bottom of described bio-filtration deodorization container 21 is connected with the air inlet of described foul smell, the top of described bio-filtration deodorization container 21 is provided with nutrient solution shower nozzle 211, the drain apparatus of described nutrient solution cycling mechanism is connected with described nutrient solution shower nozzle 211, and the inlet of described nutrient solution cycling mechanism is connected with the bottom of described bio-filtration deodorization container 21.
As shown in Figure 1, described bio-filtration deodorization container 21 is bio-filtration deodorization post, in described bio-filtration deodorization container 21, be provided with inert filler, described inert filler selects granular activated carbon as microbe carrier, this filler has following characteristics: 1. have certain retentiveness, can ensure that foul gas and biomembrane have the good effect that contacts; 2. its highly developed pore structure, has ensured that enough oxygen is supplied with and circulation fluid can easier wash away aging biomembrane, is difficult for stopping up filler; 3. larger specific area, can effectively improve the mass transfer effect between liquid phase.
As shown in Figure 1, described nutrient solution cycling mechanism comprises nutrient solution circulation liquid bath 22 and nutrient solution compression pump 23, described nutrient solution circulation liquid bath 22 is connected with the bottom of described bio-filtration deodorization container 21 by pipeline, the inlet of described nutrient solution compression pump 23 is connected with nutrient solution liquid suction pipe, the liquid pumping hole of described nutrient solution liquid suction pipe is positioned at described nutrient solution circulation liquid bath 22, and the leakage fluid dram of described nutrient solution compression pump 23 is connected with described nutrient solution shower nozzle 211 by pipeline.
As shown in Figure 1, described spray deodorizer comprises spray acid cleaning device and spraying alkaline cleaner, the exhaust outlet of described bio-filtration deodorization device is connected with described spray acid cleaning device, and the exhaust outlet of described spray acid cleaning device is connected with described spraying alkaline cleaner.
As shown in Figure 1, described spray acid cleaning device comprises spray acid cleaning container 31 and pickle cycling mechanism, the bottom of described spray acid cleaning container 31 is connected with the exhaust outlet of described bio-filtration deodorization container 21, the exhaust outlet of described bio-filtration deodorization container 21 is positioned at the top of described bio-filtration deodorization container 21, the top of described spray acid cleaning container 31 is provided with pickle atomizer 311, the drain apparatus of described pickle cycling mechanism is connected with described pickle atomizer 311, the inlet of described pickle cycling mechanism is connected with the bottom of described spray acid cleaning container 31.
As shown in Figure 1, described spray acid cleaning container 31 is spray acid cleaning post.
As shown in Figure 1, described pickle cycling mechanism comprises pickle circulation liquid bath 32 and pickle compression pump 33, described pickle circulation liquid bath 32 is connected with the bottom of described spray acid cleaning container 31 by pipeline, the inlet of described pickle compression pump 33 is connected with pickle liquid suction pipe, the liquid pumping hole of described pickle liquid suction pipe is positioned at described pickle circulation liquid bath 32, and the leakage fluid dram of described pickle compression pump 33 is connected with described pickle atomizer 311 by pipeline.
As shown in Figure 1, between described pickle circulation liquid bath 32, bio-filtration deodorization container 21, washing post can also be preferably set.
As shown in Figure 1, described spraying alkaline cleaner comprises spraying alkali cleaning container 41 and alkali wash water cycling mechanism, the bottom of described spraying alkali cleaning container 41 is connected with the exhaust outlet of described spray acid cleaning container 31, the exhaust outlet of described spray acid cleaning container 31 is arranged on the top of described spray acid cleaning container 31, the top of described spraying alkali cleaning container 41 is provided with alkali wash water atomizer 411, the drain apparatus of described alkali wash water cycling mechanism is connected with described alkali wash water atomizer 411, and the inlet of described alkali wash water cycling mechanism is connected with the bottom of described spraying alkali cleaning container 41.
As shown in Figure 1, described spraying alkali cleaning container 41 is spraying alkali cleaning post.
As shown in Figure 1, described alkali wash water cycling mechanism comprises alkali wash water circulation liquid bath 42 and alkali wash water compression pump 43, described alkali wash water circulation liquid bath 42 is connected with the bottom of described spraying alkali cleaning container 41 by pipeline, the inlet of described alkali wash water compression pump 43 is connected with alkali wash water liquid suction pipe, the liquid pumping hole of described alkali wash water liquid suction pipe is positioned at described alkali wash water circulation liquid bath 42, and the leakage fluid dram of described alkali wash water compression pump 43 is connected with described alkali wash water atomizer 411 by pipeline.
The operation principle that deodorization process and device thereof are combined in a kind of biology-spraying of removing foul smell that the utility model provides is: when operation, foul smell (hydrogen sulfide and ammonia) is first entered by the bottom of bio-trickling container 21, gas-liquid two-phase contact, remove fast more than 90% hydrogen sulfide gas by biodegradation, nutrient solution recycles, nutrient solution shower nozzle by top evenly sprays, to keep biomembranous moistening and provide nutrition as growth of microorganism, nutrient solution is diffused into bottom by the top of bio-trickling container 21, the bottom that finally flow to bio-trickling container 21 enters nutrient solution circulation liquid bath 22, bio-trickling container 21 is given vent to anger and is discharged by top, foul smell is entered by the bottom of the deodorizing post of spraying, and reverse contact of atomization absorption liquid of spraying with top processed foul smell, gas qualified discharge after treatment, absorption liquid recycles, and after certain hour, absorption liquid enters sewage disposal system.
A kind of biology-spraying of removing foul smell provided by the invention is combined deodorization process and is installed the odor concentration for sewage treatment plant, obvious processing effect, and for most of Sewage Plant, hydrogen sulfide and ammonia concentration are less than respectively 10mg/m
3and 5mg/m
3time, only need bio-trickling method to process 3s, spray-on process is processed 1s, and total residence time 4s, gives vent to anger and just can reach primary standard, and treatment effect is stable.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (8)
1. remove biology-spraying combination odor removal of foul smell for one kind, it is characterized in that: comprise bio-filtration deodorization device and spray deodorizer, wherein, the air inlet of described foul smell is connected with described bio-filtration deodorization device, and the exhaust outlet of described bio-filtration deodorization device is connected with described spray deodorizer.
2. the biology of removal foul smell according to claim 1-spraying combination odor removal, it is characterized in that: described bio-filtration deodorization device comprises bio-filtration deodorization container and nutrient solution cycling mechanism, the bottom of described bio-filtration deodorization container is connected with the air inlet of described foul smell, the top of described bio-filtration deodorization container is provided with nutrient solution shower nozzle, the liquid outlet of described nutrient solution cycling mechanism is connected with described nutrient solution shower nozzle, and the inlet of described nutrient solution cycling mechanism is connected with the bottom of described bio-filtration deodorization container.
3. the biology of removal foul smell according to claim 2-spraying combination odor removal, it is characterized in that: described nutrient solution cycling mechanism comprises nutrient solution circulation liquid bath and nutrient solution compression pump, described nutrient solution circulation liquid bath is connected with the bottom of described bio-filtration deodorization container by pipeline, the inlet of described nutrient solution compression pump is connected with nutrient solution liquid suction pipe, the liquid pumping hole of described nutrient solution liquid suction pipe is positioned at described nutrient solution circulation liquid bath, and the leakage fluid dram of described nutrient solution compression pump is connected with described nutrient solution shower nozzle by pipeline.
4. the biology of removal foul smell according to claim 1-spraying combination odor removal, it is characterized in that: described spray deodorizer comprises spray acid cleaning odor removal and spraying alkali cleaning odor removal, the exhaust outlet of described bio-filtration deodorization device is connected with described spray acid cleaning device, and the exhaust outlet of described spray acid cleaning device is connected with described spraying alkaline cleaner.
5. the biology of removal foul smell according to claim 4-spraying combination odor removal, it is characterized in that: described spray acid cleaning device comprises spray acid cleaning container and pickle cycling mechanism, the bottom of described spray acid cleaning container is connected with the exhaust outlet of described bio-filtration deodorization device, the top of described spray acid cleaning container is provided with pickle atomizer, the drain apparatus of described pickle cycling mechanism is connected with described pickle atomizer, and the inlet of described pickle cycling mechanism is connected with the bottom of described spray acid cleaning container.
6. the biology of removal foul smell according to claim 5-spraying combination odor removal, it is characterized in that: described pickle cycling mechanism comprises pickle circulation liquid bath and pickle compression pump, described pickle circulation liquid bath is connected with the bottom of described spray acid cleaning container by pipeline, the inlet of described pickle compression pump is connected with pickle liquid suction pipe, the liquid pumping hole of described pickle liquid suction pipe is positioned at described pickle circulation liquid bath, and the leakage fluid dram of described pickle compression pump is connected with described pickle atomizer by pipeline.
7. the biology of removal foul smell according to claim 4-spraying combination odor removal, it is characterized in that: described spraying alkaline cleaner comprises spraying alkali cleaning container and alkali wash water cycling mechanism, the bottom of described spraying alkali cleaning container is connected with the exhaust outlet of described spray acid cleaning device, the top of described spraying alkali cleaning container is provided with alkali wash water atomizer, the drain apparatus of described alkali wash water cycling mechanism is connected with described alkali wash water atomizer, and the inlet of described alkali wash water cycling mechanism is connected with the bottom of described spraying alkali cleaning container.
8. the biology of removal foul smell according to claim 7-spraying combination odor removal, it is characterized in that: described alkali wash water cycling mechanism comprises alkali wash water circulation liquid bath and alkali wash water compression pump, described alkali wash water circulation liquid bath is connected with the bottom of described spraying alkali cleaning container by pipeline, the inlet of described alkali wash water compression pump is connected with alkali wash water liquid suction pipe, the liquid pumping hole of described alkali wash water liquid suction pipe is positioned at described alkali wash water circulation liquid bath, and the leakage fluid dram of described alkali wash water compression pump is connected with described alkali wash water atomizer by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880597.4U CN203764131U (en) | 2013-12-30 | 2013-12-30 | Biological-spraying combined deodorization device for removing stink |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880597.4U CN203764131U (en) | 2013-12-30 | 2013-12-30 | Biological-spraying combined deodorization device for removing stink |
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|---|---|
| CN203764131U true CN203764131U (en) | 2014-08-13 |
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ID=51281379
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752166A (en) * | 2013-12-30 | 2014-04-30 | 哈尔滨工业大学深圳研究生院 | Biology-atomization combined deodorization process and device for removing odor |
-
2013
- 2013-12-30 CN CN201320880597.4U patent/CN203764131U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752166A (en) * | 2013-12-30 | 2014-04-30 | 哈尔滨工业大学深圳研究生院 | Biology-atomization combined deodorization process and device for removing odor |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20211230 |