CN110902822A - Anoxic reactor capable of effectively improving denitrification effect - Google Patents
Anoxic reactor capable of effectively improving denitrification effect Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000010802 sludge Substances 0.000 claims abstract description 29
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
Abstract
The invention discloses an anoxic reactor for effectively improving denitrification effect, which comprises a reactor tank body and a gas-liquid separator arranged at the top end of the reactor tank body; a reaction zone, a three-phase separation zone and a precipitation water outlet zone are sequentially arranged in the reactor tank from bottom to top; a three-phase separator is arranged in the three-phase separation zone, and an inclined plate/pipe and an effluent weir are arranged in the sedimentation effluent zone from bottom to top; the three-phase separator is connected to the gas-liquid separator through a gas collecting pipe, and the bottom end of the gas-liquid separator is communicated to the bottom of the reactor tank body through a return pipe; the bottom of the reactor tank body is provided with a water inlet pipe, wastewater enters the reactor tank body through the water inlet pipe for purification, and the purified water flows out from the effluent weir. The anoxic reactor can effectively avoid the loss of sludge and special strains, improve the volume load of the reactor, improve the denitrification efficiency, has higher nitrate removal rate, saves the volume and the occupied area of the reactor, and avoids the problems of high operating cost and difficult maintenance caused by a submersible stirrer.
Description
Technical Field
The invention relates to the technical field of environmental engineering and water treatment, in particular to an anoxic reactor for effectively improving denitrification effect.
Background
With the rapid development of national economy, the water quality deterioration degree of the water body is increasingly serious, wherein one of the main pollution factors is nitrogen, and the sources of the nitrogen in the water body are mainly domestic sewage, aquaculture wastewater and industrial wastewater. Because the concentration of nitrogen in some industrial wastewater is very high and seriously exceeds the standard, and the nitrogen in the industrial wastewater is difficult to treat, the nitrogen pollution of the industrial wastewater is concerned. High-concentration nitrate wastewater is directly discharged into a river to pollute surface water and underground water, so that aquatic animals and plants die or even die, if the high-concentration nitrate wastewater pollutes domestic water, light people can harm the health, serious people can die, and the rapid and harmonious development of local economy is seriously influenced. The traditional sewage treatment process has low efficiency, long flow, high investment and operation cost, and for the denitrification of waste liquid, the conversion of nitrate nitrogen into nitrogen by the denitrification by a biological method is the most economic and thorough treatment technology, but the concentration of the activated sludge treated by the existing industrial wastewater treatment equipment is limited, the volume of a denitrification section is larger, the occupied area of the equipment is large, and the cost is high; in addition, the submerged stirrer needs to be arranged to quickly homogenize biological strains and raw water in the wastewater treatment process in the anoxic reactor, so that the problems of high operation cost and difficult maintenance of the submerged stirrer exist.
Disclosure of Invention
The invention aims to provide an anoxic reactor for effectively improving the denitrification effect aiming at the defects. The anoxic reactor has good sludge interception capability, can be used in combination with common activated sludge or special strains, can effectively avoid the loss of sludge and special strains, realizes the separation of sludge age and hydraulic retention time, improves the sludge concentration in the reactor, improves the volume load of the reactor, improves the denitrification efficiency, has higher nitrate removal rate, saves the volume and the floor area of the reactor, and also avoids the problems of high operation cost and difficult maintenance caused by a submersible stirrer.
The technical scheme of the invention is as follows:
the invention provides an anoxic reactor for effectively improving denitrification effect, which comprises a reactor tank body and a gas-liquid separator arranged at the top end of the reactor tank body; a reaction zone, a three-phase separation zone and a precipitation water outlet zone are sequentially arranged in the reactor tank from bottom to top; a three-phase separator is arranged in the three-phase separation zone, and an inclined plate/pipe and an effluent weir are arranged in the sedimentation effluent zone from bottom to top; the three-phase separator is connected to the gas-liquid separator through a gas collecting pipe, and the bottom end of the gas-liquid separator is communicated to the bottom of the reactor tank body through a return pipe; the bottom of the reactor tank body is provided with a water inlet pipe, wastewater enters the reactor tank body through the water inlet pipe for purification, and the purified water flows out from the effluent weir.
Further, the volume of the reaction zone is 60-90% of the volume of the reactor tank body; the areas of the three-phase separator and the inclined plate/pipe are 40-100% of the area of the cross section of the reactor tank body.
Furthermore, a water distribution device is arranged at the bottom of the reaction zone, and a water inlet pipe is connected to the water inlet end of the water distribution device; the water distribution device is a multi-point water distribution device, the uniformity of water distribution is ensured, dead corners are prevented from being generated, and the opening of the water distribution device is downward; a water collecting device is arranged above the reaction zone, the water collecting device is arranged close to the bottom end of the three-phase separator, the water outlet end of the water collecting device is connected to the water inlet end of the water distribution device through a circulating pipe, and the circulating pipe is provided with a circulating pump to jointly form a circulating system; the water collecting device is a multi-point water collecting device, so that the uniformity of water collection is ensured, bias flow is prevented, and the opening of the water collecting device is upward. The circulating pipe is directly connected with the water inlet end of the water distribution device or is connected with the water inlet end of the water distribution device through a connecting water inlet pipe.
Furthermore, a dosing pipe is arranged on the circulating pipe. And medicaments such as acid, carbon source and the like can be added into the reaction zone of the reactor tank body through the medicament adding pipe.
Further, an electromagnetic flow meter, an online pH meter, an online ORP meter and a temperature transmitter are mounted on the circulating pipe; and the signal input ends of the electromagnetic flowmeter, the online pH meter, the online ORP meter and the temperature transmitter are respectively and directly connected to the signal output end of the master control system. The installation electromagnetic flowmeter can control the rising velocity of flow in the reaction zone through the flow of circulating pump, and online pH meter can detect the pH value in the reactor, and online ORP appearance can embody the oxidation-reduction potential in the reactor, and temperature transmitter can acquire the real-time temperature in the reactor, is convenient for in time adjust the corresponding condition of system according to the data condition, indirectly reflects the denitrification degree in the reactor, has guaranteed the denitrogenation effect of system.
Furthermore, the height of the inclined plate/pipe distance is 1.0-2.0 m, so that the low concentration of the effluent suspended matters is ensured
Further, the surface load of the precipitation water outlet area is 0.5-5.0 m3/(m2H), the occupied area of the reactor can be effectively reduced, and the equipment investment is reduced.
Further, the three-phase separator is integrated or combined.
Furthermore, the bottom in the reactor tank body is provided with a reflecting plate, the reflecting plate is arranged right below the port of the return pipe, and the distance between the reflecting plate and the port of the return pipe is greater than 0.2m, so that the internal return liquid can be better diffused at the bottom.
Furthermore, the tail end of the water outlet weir is provided with a water outlet pipe, and the water outlet weir is connected to other processing units through the water outlet pipe.
Furthermore, a sludge discharge pipe is arranged at the bottom end of the reactor tank body, and the sludge discharge pipe can discharge sludge through gravity and can also discharge sludge through a pump; the reactor tank body side wall and the top are respectively provided with a first manhole and a second manhole for overhauling and observing.
Further, the reaction zone is filled with a filler; the filler is activated sludge or a mixture of the activated sludge and the filler; the filler accounts for 20-80% of the volume of the reaction zone; the filler is fixed biological filler or suspended biological filler.
The invention has the beneficial effects that:
(1) the concentration of the activated sludge in the anoxic reactor is high, which is 4-8 times that of the common activated sludge system, so that the volume of a denitrification section is greatly reduced, the occupied area is reduced by 30-60% when the anoxic reactor is used, and the investment cost is reduced.
(2) The three-phase separator and the inclined plate/pipe arranged in the anoxic reactor have better interception effect on the activated sludge, effectively avoid the loss of the activated sludge and special strains in the wastewater treatment process, enable the denitrifying bacteria to be in a stable working environment for a long time, are beneficial to the growth and the propagation of the denitrifying bacteria and improve the denitrifying efficiency.
(3) When the anoxic reactor of the invention treats wastewater, nitrogen (N) generated in the denitrification process2) Under the triple action of disturbance to the waste water in the reactor tank, internal reflux under the action of the gas-liquid separator and the circulating system, a submersible stirring device is not needed, the purpose of homogenization can be achieved in the reactor tank, the mixing effect is good, and after the waste water entering the water inlet pipe and the water flowing down from the gas-liquid separator through the reflux pipe are diluted, the impact resistance load of the reactor can be greatly improved, and the denitrification efficiency can be improved.
(4) The inclined plates/pipes are arranged in the precipitation water outlet zone of the anoxic reactor, so that the anoxic reactor can adapt to larger surface load, and the treatment scale of a single reactor is improved.
(5) The volume load of the nitrate nitrogen of the anoxic reactor is 5-10 times of that of a common denitrification reactor (tank), and the removal rate of the nitrate nitrogen can reach 90-99%.
Drawings
FIG. 1 shows a schematic structural diagram of an anoxic reactor according to the invention.
In the figure, the device comprises a reactor tank 1, a reactor tank 2, a water distribution device 3, a first manhole 4, a water collection device 5, a three-phase separator 6, an inclined plate/pipe 7, a water outlet weir 8, a gas-liquid separator 9, a circulating pump 10, a reflecting plate 11, a water inlet pipe 12, a chemical feeding pipe 13, a circulating pipe 14, a sludge discharge pipe 15, a water outlet pipe 16, a gas collecting pipe 17, a return pipe 18, an electromagnetic flowmeter 19, an online pH meter 20, an online ORP meter 21, a temperature transmitter 22 and a second manhole.
FIG. 2 is a graph showing the effect of removing nitrate in example 1 of application of the present invention.
FIG. 3 is a graph showing the effect of removing COD in example 1 of the present invention.
FIG. 4 is a graph showing the effect of removing nitrate in application example 2 of the present invention.
Detailed Description
Example 1
Referring to fig. 1, an anoxic reactor for effectively improving denitrification effect comprises a reactor tank 1 and a gas-liquid separator 8 at the top end of the reactor tank 1; a reaction zone, a three-phase separation zone and a precipitation water outlet zone are sequentially arranged in the reactor tank body 1 from bottom to top; a three-phase separator 5 is arranged in the three-phase separation zone, and an inclined plate/pipe 6 and an effluent weir 7 are arranged in the precipitation effluent zone from bottom to top; the three-phase separator 5 is connected to a gas-liquid separator 8 through a gas collecting pipe 16, and the bottom end of the gas-liquid separator 8 is communicated to the bottom of the reactor tank 1 through a return pipe 17; the bottom of the reactor tank body 1 is provided with a water inlet pipe 11, wastewater enters the reactor tank body 1 through the water inlet pipe 11 for purification, and purified water flows out from the water outlet weir 7. The height of the inclined plate/pipe 6 is 1.0-2.0 m. The surface load of the precipitation water outlet area is 0.5-5.0 m3/(m2H). The three-phase separator 5 is integrated or combined. An outlet pipe 15 is arranged at the tail end of the water outlet weir 7, and the water outlet weir 7 is connected to other processing units through the outlet pipe 15.
The bottom of the reaction zone is provided with a water distribution device 2, and a water inlet pipe 11 is connected to the water inlet end of the water distribution device 2; the water distribution device 2 is a multipoint water distribution device, and the opening of the water distribution device 2 is downward. The volume of the reaction zone is 60-90% of the volume of the reactor tank body 1, and the areas of the three-phase separator and the inclined plate/pipe are 40-100% of the area of the cross section of the reactor tank body 1.
A water collecting device 4 is arranged above the reaction zone, the water collecting device 4 is arranged near the bottom end of the three-phase separator 5, and the water outlet end of the water collecting device 4 is connected to the water inlet end of the water distribution device 2 through a circulating pipe 13; the opening of the water collecting device 4 is upward and is a multi-point water collecting device; the circulating pipe 13 is provided with a circulating pump 9 which jointly form a circulating system; the circulating pipe 13 is directly connected with the water inlet end of the water distribution device 2 or is connected with the water inlet end of the water distribution device 2 through the connecting water inlet pipe 11. The circulating pipe 13 is provided with a dosing pipe 12. An electromagnetic flowmeter 18, an online pH meter 19, an online ORP meter 20 and a temperature transmitter 21 are arranged on the circulating pipe 13; and the signal input ends of the electromagnetic flowmeter 18, the online pH meter 19, the online ORP meter 20 and the temperature transmitter 21 are respectively and directly connected to the signal output end of the master control system.
The bottom in the reactor tank body 1 is provided with a reflecting plate 10, the reflecting plate 10 is arranged right below the port of the return pipe 17, and the distance between the reflecting plate 10 and the port of the return pipe 17 is more than 0.2 m. A sludge discharge pipe 14 is arranged at the bottom end of the reactor tank body 1; the side wall and the top of the reactor tank body 1 are respectively provided with a first manhole 3 and a second manhole 22 for maintenance and observation.
Example 2
The anoxic reactor for effectively improving the denitrification effect in the embodiment 1 is used for treating industrial wastewater, and the working process is as follows: wastewater enters through a water inlet pipe 11, the wastewater is uniformly introduced into a reaction zone of a reactor tank body 1 through a water distribution device 2, high-concentration nitrate in the wastewater is subjected to denitrification in the reaction zone, denitrifying bacteria use the nitrate as an electron acceptor, use organic matters as a carbon source and an electron donor to provide energy and obtain oxidation stability, reduce the nitrate into nitrogen, and respectively add agents such as acid (or alkali) and the carbon source into the reactor tank body 1 through a drug adding pipe 12 when the pH value in the wastewater is less than 6.0 (or the pH value is more than 8.0) and the carbon-nitrogen ratio is less than 4. The wastewater after denitrification treatment enters a three-phase separation zone from a reaction zone, and nitrogen (N) generated in the denitrification process is generated under the action of a three-phase separator and an inclined plate (pipe)2) The wastewater enters the gas-liquid separator 8 through the gas collecting pipe 16, the wastewater further enters the precipitation effluent area from the three-phase separation area, the three-phase separator 5 and the inclined plate/pipe 6 have a good interception effect on the activated sludge, the loss of the activated sludge and functional strains is effectively avoided, the denitrifying bacteria are kept in a stable working environment for a long time, the growth and the propagation of the denitrifying bacteria are facilitated, and the treated purified water flows out through the water outlet pipe at one end of the effluent weir. When water is fed, the circulating system starts to operate, and the process is as follows: the mud-water mixture at the upper part of the reaction zone enters the inlet end of a circulating pump 9 after being collected by a water collecting device 4, and is uniformly distributed at the bottom of the reactor through a water distribution device 2 under the action of the circulating pump. Nitrogen (N) produced during the denitrification process in the whole process2) Internal reflux of wastewater in the reactor tank under the action of disturbance and gas-liquid separatorAnd under the triple action of the circulating system, the purpose of homogenization can be achieved in the reactor tank body, and the mixing effect is better.
Application example 1
The reaction zone of the anoxic reactor of example 1 of the present invention was filled with activated sludge, which accounted for 20% of the volume of the reaction zone, and conventional denitrifying bacteria were added to the activated sludge in conventional amounts. The anoxic reactor is used in the high nitrate wastewater treatment project of a certain dangerous wastewater treatment company, the high nitrate wastewater is introduced into the anoxic reactor for treatment, the stable operation effect of the anoxic reactor is shown in figures 2 and 3, as shown in figure 2, the salt content of the denitrification inlet water is less than 6%, and the nitrate (in NO) of the inlet water is3 -Measured) concentration of 7260mg/L, effluent nitrate concentration of less than 50mg/L and nitrate removal rate of 99 percent; as shown in figure 3, the COD concentration of the inlet water is 6233mg/L, the COD concentration of the outlet water is 2000mg/L, the COD removal rate can be stabilized at 60%, and the requirement of the denitrification process on a carbon source is beneficial to reducing the COD in the organic waste liquid, so that the aim of cooperatively treating nitrate and organic matters is fulfilled. When the anoxic reactor system of the invention interrupts water inflow for a long time (1-2 months), the system can recover within 3 weeks, and when the anoxic reactor system interrupts water inflow for a short time (1-2 days), the system can recover immediately.
Application example 2
The anoxic reactor is used in pickling waste water treatment engineering of certain stainless steel plant, wherein the waste water treatment scale is 70m3D, NO of inlet water wastewater of anoxic reactor3The N concentration is 900-1100 mg/L, the COD concentration is 1300-1500 mg/L, and the pH is 7.0-8.0.
The diameter of the anoxic reactor is 4.5m, the height is 6.0m, and the design volume load is 1.0kgNO3-N/(m3D), hydraulic retention time 24h, other structures are the same as example 1. Filling a mixture (volume ratio is 1: 1) of activated sludge and conventional suspended biological fillers, the volume of which is 80% of the volume of the reaction zone, in the reaction zone of the anoxic reactor, wherein the fillers account for 80% of the volume of the reaction zone, and conventional denitrifying bacteria are added into the activated sludge according to conventional dosage.
The inoculation concentration in the reaction zone is 15kgMLSS/m3The flocculent activated sludge is inoculated with 1.3 percent of special strain (liquid) (specialOne species is Pannonibacter phragmitetus, application No.: 201910396425.1) through a dosing tube 12 to add acid and supplemental carbon source to the reactor tank 1.
The effect of removing nitrate nitrogen after the wastewater is treated by the anoxic reactor of the invention and the anoxic reactor is stably operated is shown in figure 4, the effluent NO flowing out from the water outlet pipe 153N concentration of 5-20 mg/L, COD concentration of 900-1100 mg/L, pH of 8.3-8.8, NO3-N removal > 97%.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. An anoxic reactor for effectively improving denitrification effect is characterized by comprising a reactor tank body (1) and a gas-liquid separator (8) arranged at the top end of the reactor tank body (1); a reaction zone, a three-phase separation zone and a precipitation water outlet zone are sequentially arranged in the reactor tank body (1) from bottom to top; a three-phase separator (5) is arranged in the three-phase separation zone, and an inclined plate/pipe (6) and an effluent weir (7) are arranged in the precipitation effluent zone from bottom to top; the three-phase separator (5) is connected to the gas-liquid separator (8) through a gas collecting pipe (16), and the bottom end of the gas-liquid separator (8) is communicated to the bottom of the reactor tank body (1) through a return pipe (17); the bottom of the reactor tank body (1) is provided with a water inlet pipe (11), wastewater enters the reactor tank body (1) through the water inlet pipe (11) for purification, and the purified water flows out from the water outlet weir (7).
2. The anoxic reactor for effectively improving the denitrification effect according to claim 1, wherein the volume of the reaction zone is 60-90% of the volume of the reactor tank body (1); the areas of the three-phase separator and the inclined plate/pipe are 40-100% of the area of the cross section of the reactor tank body (1).
3. The anoxic reactor for effectively improving the denitrification effect according to claim 1, wherein the water distribution device (2) is disposed at the bottom of the reaction zone, the water inlet pipe (11) is connected to the water inlet end of the water distribution device (2), the water distribution device (2) is a multi-point water distribution device, and the water distribution device (2) is opened downwards; a water collecting device (4) is arranged above the reaction zone, the water collecting device (4) is arranged near the bottom end of the three-phase separator (5), and the water outlet end of the water collecting device (4) is connected to the water inlet end of the water distribution device (2) through a circulating pipe (13); the opening of the water collecting device (4) is upward; and a circulating pump (9) is arranged on the circulating pipe (13).
4. An anoxic reactor for effectively improving the denitrification effect according to claim 3, wherein the circulating pipe (13) is provided with a dosing pipe (12).
5. The anoxic reactor for effectively improving the denitrification effect according to claim 3, wherein the circulating pipe (13) is provided with an electromagnetic flow meter (18), an online pH meter (19), an online ORP meter (20) and a temperature transmitter (21); and the signal input ends of the electromagnetic flow meter (18), the online pH meter (19), the online ORP meter (20) and the temperature transmitter (21) are respectively and directly connected to the signal output end of the master control system.
6. The anoxic reactor for effectively improving the denitrification effect according to claim 1 wherein the height of the inclined plates/tubes (6) is 1.0-2.0 m.
7. The anoxic reactor according to claim 1 for effectively improving denitrification effect, wherein the surface load of the precipitation effluent zone is 0.5-5.0 m3/(m2·h)。
8. The anoxic reactor for effectively improving the denitrification effect according to claim 1, wherein a baffle plate (10) is installed at the bottom in the reactor tank (1), the baffle plate (10) is arranged right below the port of the return pipe (17), and the distance between the baffle plate (10) and the port of the return pipe (17) is more than 0.2 m; a sludge discharge pipe (14) is arranged at the bottom end of the reactor tank body (1); the side wall and the top of the reactor tank body (1) are respectively provided with a first manhole (3) and a second manhole (22) for overhauling and observing.
9. An anoxic reactor for effectively improving denitrification effect according to claim 1, wherein the effluent weir (7) is provided with a water outlet pipe (15) at the end, and the effluent weir (7) is connected to other treatment units through the water outlet pipe (15).
10. An anoxic reactor for effectively improving denitrification effect according to claim 1, wherein the reaction zone is filled with a filler; the filler is activated sludge or a mixture of the activated sludge and the filler; the filler accounts for 20-80% of the volume of the reaction zone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911348003.3A CN110902822A (en) | 2019-12-24 | 2019-12-24 | Anoxic reactor capable of effectively improving denitrification effect |
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| CN201911348003.3A CN110902822A (en) | 2019-12-24 | 2019-12-24 | Anoxic reactor capable of effectively improving denitrification effect |
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| CN (1) | CN110902822A (en) |
Cited By (2)
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