CN103663692B - Integrated shortcut nitrification/anaerobic ammoxidation reactor - Google Patents
Integrated shortcut nitrification/anaerobic ammoxidation reactor Download PDFInfo
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- CN103663692B CN103663692B CN201310396362.2A CN201310396362A CN103663692B CN 103663692 B CN103663692 B CN 103663692B CN 201310396362 A CN201310396362 A CN 201310396362A CN 103663692 B CN103663692 B CN 103663692B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000006396 nitration reaction Methods 0.000 claims description 44
- 238000005273 aeration Methods 0.000 claims description 36
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 34
- 229910021529 ammonia Inorganic materials 0.000 claims description 18
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 238000013022 venting Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 abstract description 14
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 9
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract 3
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 3
- 238000013019 agitation Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an integrated shortcut nitrification/anaerobic ammoxidation reactor which comprises a reactor body, a base and a support, wherein the reactor body is fixed on the base; the inside of the reactor body is provided with a central shortcut nitrification unit and a peripheral anaerobic ammoxidation unit from the center to the periphery; the central shortcut nitrification unit is divided into a water outlet region, a reaction region and a first water inlet region from top to bottom; a first baffle with a middle grid on the bottom is arranged between both sides of the water outlet region and the peripheral anaerobic ammoxidation unit; the first baffle is fixed on the reactor body; and the peripheral anaerobic ammoxidation unit is divided into a second water inlet region, a first reaction region, a connection region and a second reaction region from inside to outside. According to the invention, the shortcut nitrification unit and the anaerobic ammoxidation unit can be operated independently or be used together, and coupling of two reactions can be realized in the single reactor to treat high ammonia nitrogen wastewater.
Description
Technical field
The present invention relates to a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor.
Background technology
Along with the development of industrial and agricultural production and the raising of living standards of the people, all kinds of wastewater discharge sharply increases, and this has higher requirement to wastewater processing technology.Especially a large amount of discharge of high ammonia-nitrogen wastewater and strict ambient water quality emission standard, bring huge challenge to removing of high ammonia-nitrogen wastewater.At present, be that the bio-denitrification technology of core occupies irreplaceable status in the process of high ammonia-nitrogen wastewater with microbial technique.Wherein, novel denitrification process Anammox, because of its efficient, low consumption, becomes the fresh combatants in wastewater biological denitrificaion technique day by day.
As everyone knows, ammonia nitrogen and the nitrite nitrogen of Anammox reaction required water inlet matrix to be concentration ratio be 1:1.32, so need by short distance nitration for it provides the water inlet of applicable concentration ratio before anaerobic ammonia oxidation process.In view of the actual water inlet matrix of above-mentioned denitrification process needs, simultaneously, because in short distance nitration and anaerobic ammonia oxidation process, the physiology of the difference of functional microbial, functional microbial, ecological demand amount are different, short distance nitration and Anammox reaction often belong in two different reactors by wastewater treatment worker.But point building formula reactor has the drawbacks such as floor space is large, capital cost is high.Therefore, the integrated reactor that floor space is little, capital cost is low is just progressively favored.
Summary of the invention
Divide build the shortcomings such as the floor space that formula reactor exists is large, capital cost is high to overcome existing short distance nitration and Anammox, the invention provides integrated short distance nitration/anaerobic ammonia oxidation reactor that a kind of floor space is little, capital cost is low.
First, the integration of short distance nitration and Anammox reaction is realized in single reaction vessel, (matrix is: ammonia nitrogen to provide short distance nitration to intake by the water inlet pipe being positioned at integrated reactor center to reactor, nitrite nitrogen), aeration rate (1.00 – 1.51mg L-1) is regulated by the external world, pH(7.5 – 8.0), it is 1:1 that influent alkalinity makes the water outlet of short distance nitration reactor reach ammonia nitrogen with the ratio of nitrite nitrogen concentration with the ratio (1.0 – 1.1) etc. of ammonia nitrogen concentration, Anammox reaction zone is entered with the first baffle plate of grid after being applicable to Anammox water inlet by bottom, the anti impulsion load ability that the setting of the first baffle plate improves reactor also improves the stability of system self simultaneously, the setting of multistage baffle plate (the first plate washer, second baffle) improves the sludge retention ability of system, first, second baffle plate set in periphery Anammox unit, contributes to the negative impact alleviating the impact of the instantaneous water yield to a certain extent.Therefore, the present invention by two kinds of different reactions, completes efficient, economic, stable high-ammonia wastewater and removes in single reaction vessel, floor space and capital construction cost all little.
The technical solution used in the present invention is:
A kind of integrated short distance nitration/anaerobic ammonia oxidation reactor, comprise reactor body, base and support, described reactor body is fixed on described base, it is characterized in that: described reactor body Nei Zi center is provided with center short distance nitration unit and periphery Anammox unit to periphery;
Described center short distance nitration unit is divided into exhalant region, reaction zone and the first inhalant region from bottom to top, be provided with first baffle plate of bottom with middle grid between described both sides, exhalant region and periphery Anammox unit, the first described baffle plate is fixed on described reactor body; Light carrier is provided with and the bottom of described reaction zone is provided with aeration head in described reaction zone, described aeration head is connected with aeration tube by through described first inhalant region of center short distance nitration unit and the hollow aeration guide wire of reaction zone, and described hollow aeration guide wire is fixed on the support of reactor base by fastening piece; The water distributor be connected with water inlet pipe is provided with above the first described inhalant region;
Described periphery Anammox unit is divided into the second inhalant region from inside to outside, reacts a district, is connected district and reaction 2nd district, described reaction one district is provided with the second baffle of top with middle grid with described being connected between district, is provided with first baffle plate of bottom with middle grid between the second described inhalant region and the exhalant region of short distance nitration unit; Described upper end, reaction two district is provided with settling region, and be provided with first baffle plate of bottom with middle grid between described reaction two district and settling region, described settling region sidewall is provided with overflow weir and water outlet, and described water outlet is connected with rising pipe; On the right side of described reaction two district, bottom is provided with mud discharging mouth, described mud discharging mouth is provided with the valve controlling its opening and closing; The top of described periphery Anammox unit is provided with venting port.
Further, the exhalant region of described center short distance nitration unit, reaction zone and the first inhalant region are all cylindrical, and the aspect ratio of each part mentioned above is 2 ~ 5:1.
Further, the second inhalant region of described periphery Anammox unit, react a district, to be connected district and reaction 2nd district all cylindrical, the radius ratio of each part mentioned above is respectively 1:1.2 ~ 1.4:1.3 ~ 1.5:1.5 ~ 1.7.
Further, between the exhalant region of described center short distance nitration unit and reaction zone with aeration head lower end for boundary, described reaction zone and the first inhalant region with liquid level of intaking for boundary.
Further, the first described baffle plate and the width of second baffle are with the internal diameter ratio of reactor body: 1 ~ 1.5:10, and grid gap is 10 ~ 40mm, and the ratio that height of grid accounts for the first baffle plate overall length is: 10 ~ 20%.
Further, the proportion of described light carrier for water is 0.5 ~ 0.95.
Further, described water distributor is 0.1 ~ 0.3m apart from liquid level distance on the first inhalant region.
Further, described overflow weir is 1:4 ~ 10 apart from reactor body barrel portion lower end the horizontal plane with the ratio of reactor body barrel portion height; Described height of weir plate is 1:10 ~ 15 with the ratio of reactor body barrel portion height; Described water outlet internal diameter is 1:8 ~ 15 with the ratio of reactor body barrel portion internal diameter.
Further, described mud discharging mouth internal diameter is 1:8 ~ 10 with the ratio of reactor body barrel portion internal diameter; Described venting port internal diameter is 1:8 ~ 10 with the ratio of reactor body barrel portion internal diameter d2.
The described aeration tube that in the present invention, aeration is used is connected with aeration head through hollow aeration guide wire, the position that both hollow aeration guide wire and fastening piece top to bottom, left and right, front and rear Joint regulation or part adjustment according to actual needs can be controlled residing for aeration head effectively, and the reaction zone volume of center short distance nitration unit effectively can be regulated by up-down adjustment hollow aeration guide wire.
Integrated short distance nitration/the anaerobic ammonia oxidation reactor of one of the present invention, it can be built by synthetic glass or steel plate.Carrier directly adds from reactor head.Waste water fully mixes with muddy water in reaction zone after being entered by water-in at once.Under aeration effect, upstream flow waste water and contacts with each other, the solid high-speed circulating flowing of aqueous vapor with falling, and in the effect of reaction zone generation strong agitation, realizes good mixing and mass transfer.
Beneficial effect of the present invention is embodied in:
1) short distance nitration and Anammox two unit not only can independent operations but also can conbined usage, and in single reaction vessel, realize the couplings of two kinds of reactions to process high ammonia-nitrogen wastewater, floor space, capital cost, processing cost are all economical suitable;
2) by center aeration, vigorous agitation in short distance nitration unit process district, is convenient to gas dispersion, is conducive to fully contacting of ammonia oxidizing bacteria and oxygen, improves the utilization ratio of oxygen;
3) strengthen sludge retention amount by baffle plate set in periphery Anammox unit, improve the duration of contact of waste water and anaerobic ammonium oxidizing bacteria, be beneficial to mass transfer and reaction;
4) setting of multistage middle grating baffle plate, can control the influent load of Anammox unit effectively, improves the anti impulsion load ability of system and the stability of system.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is vertical view of the present invention.
Embodiment
See figures.1.and.2, a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor, comprise reactor body 7, base and support 13, described reactor body 7 is fixed on described base, and described reactor body 7 Nei Zi center is provided with center short distance nitration unit 1 and periphery Anammox unit 2 to periphery;
Described center short distance nitration unit 1 is divided into exhalant region 3, reaction zone 4 and the first inhalant region 5 from bottom to top, be provided with first baffle plate 6 of bottom with middle grid between described both sides, exhalant region 3 and periphery Anammox unit 2, the first described baffle plate 6 is fixed on described reactor body 7; Light carrier is provided with and the bottom of described reaction zone 4 is provided with aeration head 8 in described reaction zone 4, described aeration head 8 is connected with aeration tube 14 by through described first inhalant region 5 of center short distance nitration unit 1 and the hollow aeration guide wire 11 of reaction zone 4, and described hollow aeration guide wire 11 is fixed on the support 13 of reactor base by fastening piece 12; The water distributor 9 be connected with water inlet pipe 10 is provided with above the first described inhalant region 5;
Described periphery Anammox unit 2 is divided into the second inhalant region 15 from inside to outside, reacts a district 16, is connected district 17 and reaction two districts 18, described reaction one district 16 is provided with the second baffle 19 of top with middle grid with described being connected between district 17, is provided with first baffle plate 6 of bottom with middle grid between the second described inhalant region 15 and the exhalant region 3 of short distance nitration unit; Described upper end, reaction two district 18 is provided with settling region 20, first baffle plate 6 of bottom with middle grid is provided with between described reaction two district 18 and settling region 20, described settling region 20 sidewall is provided with overflow weir 21 and water outlet 22, and described water outlet 22 is connected with rising pipe 23; On the right side of described reaction two district 18, bottom is provided with mud discharging mouth 24, described mud discharging mouth 24 is provided with the valve 25 controlling its opening and closing; The top of described periphery Anammox unit 2 is provided with venting port 26.
Further, the exhalant region 3 of described center short distance nitration unit 1, reaction zone 4 and the first inhalant region 5 are all cylindrical, and the aspect ratio of each part mentioned above is 2 ~ 5:1.
Further, the second inhalant region 15 of described periphery Anammox unit 2, react a district 16, to be connected district 17 and reaction two districts 18 all cylindrical, the radius ratio of each part mentioned above is respectively 1:1.2 ~ 1.4:1.3 ~ 1.5:1.5 ~ 1.7.
Further, between the exhalant region 3 of described center short distance nitration unit 1 and reaction zone 4 with aeration head 8 lower end for boundary, described reaction zone 4 and the first inhalant region 5 with liquid level of intaking for boundary.
Further, the first described baffle plate 6 and the width of second baffle 19 are with the internal diameter ratio of reactor body 7: 1 ~ 1.5:10, and grid gap is 10 ~ 40mm, and the ratio that height of grid accounts for the first baffle plate 6 overall length is: 10 ~ 20%.
Further, the proportion of described light carrier for water is 0.5 ~ 0.95.
Further, described water distributor 9 is 0.1 ~ 0.3m apart from liquid level distance on the first inhalant region 5.
Further, described overflow weir 21 is 1:4 ~ 10 apart from reactor body 7 barrel portion lower end the horizontal plane and the ratio of reactor body 7 barrel portion height; Described overflow weir 21 height is 1:10 ~ 15 with the ratio of reactor body 7 barrel portion height; Described water outlet 22 internal diameter is 1:8 ~ 15 with the ratio of reactor body 7 barrel portion internal diameter.
Further, described mud discharging mouth 24 internal diameter is 1:8 ~ 10 with the ratio of reactor body 7 barrel portion internal diameter; Described venting port 26 internal diameter and reactor body 7 barrel portion internal diameter d
2ratio be 1:8 ~ 10.
The described aeration tube 14 that in the present invention, aeration is used is connected with aeration head 8 through hollow aeration guide wire 11, the position that both hollow aeration guide wire 11 and fastening piece 12 top to bottom, left and right, front and rear Joint regulation or part adjustment according to actual needs can be controlled residing for aeration head 8 effectively, and the volume of the reaction zone 4 of center short distance nitration unit 1 effectively can be regulated by up-down adjustment hollow aeration guide wire 11.
Integrated short distance nitration/the anaerobic ammonia oxidation reactor of one of the present invention, it can be built by synthetic glass or steel plate.Carrier directly adds from reactor head.Waste water fully mixes with muddy water in reaction zone after being entered by water-in at once.Under aeration effect, upstream flow waste water and contacts with each other, the solid high-speed circulating flowing of aqueous vapor with falling, and in the effect of reaction zone generation strong agitation, realizes good mixing and mass transfer.
Content described in this specification sheets embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the specific form that embodiment is stated, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (8)
1. integrated short distance nitration/anaerobic ammonia oxidation reactor, comprise reactor body, base and support, described reactor body is fixed on described base, it is characterized in that: described reactor body Nei Zi center is provided with center short distance nitration unit and periphery Anammox unit to periphery;
Described center short distance nitration unit is divided into exhalant region, reaction zone and the first inhalant region from bottom to top, be provided with first baffle plate of bottom with middle grid between described both sides, exhalant region and periphery Anammox unit, the first described baffle plate is fixed on described reactor body; Light carrier is provided with and the bottom of described reaction zone is provided with aeration head in described reaction zone, described aeration head is connected with aeration tube by through described first inhalant region of center short distance nitration unit and the hollow aeration guide wire of reaction zone, and described hollow aeration guide wire is fixed on the support of reactor base by fastening piece; The water distributor be connected with water inlet pipe is provided with above the first described inhalant region;
Described periphery Anammox unit is provided with the second inhalant region in same annulus from inside to outside and reacts a district, being connected district and reacting 2nd district in same annulus, described reaction one district is provided with the second baffle of top with middle grid with described being connected between district, is provided with first baffle plate of bottom with middle grid between the second described inhalant region and the exhalant region of short distance nitration unit; Described the outer of reaction two district is equipped with settling region, is provided with the third gear plate of bottom with middle grid between described reaction two district and settling region; Described settling region sidewall is provided with overflow weir and water outlet, and described water outlet is connected with rising pipe; On the right side of described reaction two district, bottom is provided with mud discharging mouth, described mud discharging mouth is provided with the valve controlling its opening and closing; The top of described periphery Anammox unit is provided with venting port.
2. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 1, it is characterized in that: the exhalant region of described center short distance nitration unit, reaction zone and the first inhalant region are all cylindrical, and the aspect ratio of each part mentioned above is 2 ~ 5:1.
3. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 2, it is characterized in that: between the exhalant region of described center short distance nitration unit and reaction zone with aeration head lower end for boundary, described reaction zone and the first inhalant region with liquid level of intaking for boundary.
4. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 3, is characterized in that: grid gap is 10 ~ 40mm, and the ratio that height of grid accounts for the first baffle plate, second baffle or third gear plate overall length is: 10 ~ 20%.
5. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 4, is characterized in that: the proportion of described light carrier for water is 0.5 ~ 0.95.
6. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 5, is characterized in that: described water distributor is 0.1 ~ 0.3m apart from liquid level distance on the first inhalant region.
7. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 6, is characterized in that: described overflow weir is 1:4 ~ 10 apart from reactor body barrel portion lower end the horizontal plane with the ratio of reactor body barrel portion height; Described height of weir plate is 1:10 ~ 15 with the ratio of reactor body barrel portion height; Described water outlet internal diameter is 1:8 ~ 15 with the ratio of reactor body barrel portion internal diameter.
8. a kind of integrated short distance nitration/anaerobic ammonia oxidation reactor as claimed in claim 7, is characterized in that: described mud discharging mouth internal diameter is 1:8 ~ 10 with the ratio of reactor body barrel portion internal diameter; Described venting port internal diameter is 1:8 ~ 10 with the ratio of reactor body barrel portion internal diameter d2.
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| CN105330023B (en) * | 2015-12-01 | 2017-10-20 | 杭州师范大学 | A kind of integrated gravity flow biological denitrificaion sulphur removal reactor |
| CN110002678B (en) * | 2019-04-19 | 2021-12-31 | 北京工业大学 | Device and method for realizing deep denitrification of municipal sewage by post-positioned short-cut denitrification of PNA (peptide nucleic acid) system |
| AU2020284266A1 (en) * | 2019-05-24 | 2021-10-07 | The University Of Queensland | Method for treating wastewater or sludge |
| CN114590892B (en) * | 2020-12-04 | 2023-05-26 | 中国石油天然气集团有限公司 | Rare earth tail water denitrification device and method |
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| US7008538B2 (en) * | 2003-08-20 | 2006-03-07 | Kasparian Kaspar A | Single vessel multi-zone wastewater bio-treatment system |
| JP2005238166A (en) * | 2004-02-27 | 2005-09-08 | Kurita Water Ind Ltd | Anaerobic ammonoxidation treatment method |
| CN2835233Y (en) * | 2005-11-25 | 2006-11-08 | 浙江大学 | Anaerobic ammonia oxidation reactor |
| CN201264957Y (en) * | 2008-06-13 | 2009-07-01 | 北京城市排水集团有限责任公司 | Sludge digestive fluid short-range nitration and anaerobic ammoxidation combined denitrification apparatus |
| CN102452768A (en) * | 2010-10-27 | 2012-05-16 | 中国科学院城市环境研究所 | Denitrifying phosphorus removal-anammox-shortcut nitrification integrated baffled reaction equipment |
| CN102249407A (en) * | 2011-05-13 | 2011-11-23 | 杭州师范大学 | High-efficiency anaerobic ammonia oxidation reactor |
| CN202379808U (en) * | 2011-12-09 | 2012-08-15 | 北京工业大学 | Terminal garbage percolate shortcut nitrification and anaerobic ammonia oxidation combination denitrification device |
| CN202953872U (en) * | 2012-12-18 | 2013-05-29 | 盐城工学院 | Concentric circle type biochemical-precipitate integral treatment device for mixed flow |
| CN103086583B (en) * | 2012-12-25 | 2014-07-02 | 北京工业大学 | Device and method of enhancing sludge stability and sludge digestion liquid treatment |
| CN103253770A (en) * | 2013-06-08 | 2013-08-21 | 大连生源水处理设备发展有限公司 | Integrated biological reactor for treatment of industrial wastewater and domestic sewage |
| CN203530022U (en) * | 2013-09-03 | 2014-04-09 | 杭州师范大学 | Integrated partial nitrification/anaerobic ammonia oxidation reactor |
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Denomination of invention: An integrated short-range nitrification/anaerobic ammonia oxidation reactor Granted publication date: 20150617 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Hangzhou Yuhang sub branch Pledgor: Zhejiang Wole Technology Co.,Ltd. Registration number: Y2024980024972 |
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