CN114380461A - In-situ sewage treatment and reuse method for mobile toilet - Google Patents
In-situ sewage treatment and reuse method for mobile toilet Download PDFInfo
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- CN114380461A CN114380461A CN202111606192.7A CN202111606192A CN114380461A CN 114380461 A CN114380461 A CN 114380461A CN 202111606192 A CN202111606192 A CN 202111606192A CN 114380461 A CN114380461 A CN 114380461A
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- 239000010865 sewage Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000001728 nano-filtration Methods 0.000 claims abstract description 20
- 239000010802 sludge Substances 0.000 claims abstract description 17
- 230000002550 fecal effect Effects 0.000 claims abstract description 14
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000011010 flushing procedure Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims abstract description 4
- 239000002351 wastewater Substances 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 3
- 238000004064 recycling Methods 0.000 claims description 18
- 230000014759 maintenance of location Effects 0.000 claims description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000006396 nitration reaction Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000003657 drainage water Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- 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
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage in-situ treatment and reuse method for a mobile toilet. The method adopts a sewage in-situ treatment and reuse system for treatment, and comprises the following steps: after the fecal sewage sequentially enters an adjusting tank along a pipeline and is uniformly mixed, the fecal sewage is further crushed by a water pump and enters a screw stacking machine to concentrate and dehydrate solids in the sewage, and produced water enters an anoxic tank to carry out denitrification reaction to remove total nitrogen in target sewage and degrade soluble organic matters; the produced water after the denitrification reaction treatment enters an aerobic tank for nitrification reaction and oxidation reaction of organic carbon, ammonia nitrogen and soluble organic matters in the target sewage are degraded, and then the separation of the activated sludge and the wastewater is realized through tubular ultrafiltration; and removing a small amount of soluble organic matters in the ultrafiltration effluent through nanofiltration to obtain nanofiltration effluent with the standard water quality for toilet flushing water, wherein the nanofiltration concentrated water meets the water inlet requirement of a town sewer pipe network and is discharged into the town sewer pipe network. The method can realize standard-reaching discharge of the external drainage water and reuse of the treated produced water for flushing the toilet.
Description
Technical Field
The invention relates to the technical field of sewage treatment of mobile toilets, in particular to a sewage in-situ treatment and recycling method for a mobile toilet.
Background
The movable toilet is a movable toilet, and compared with the traditional toilet, the movable toilet has all obvious advantages, such as being movable, combinable and convenient to transport. The mobile toilet is suitable for stations, wharfs, scenic spots, construction sites, squares and densely populated public places. However, the problem of water supply and drainage in portable toilets has been a technical bottleneck limiting the development thereof.
The current mobile toilets generally have the following problems: firstly, water supply is inconvenient, for example, the distance between the mobile toilet and a water supply source is long, and the water supply is inconvenient to use; secondly, the drainage is inconvenient, for example, a municipal sewage pipe network which allows the direct discharge of the excrement and sewage is not arranged near the mobile toilet; thirdly, the depth of the drainage treatment is insufficient, and the quality of the drainage water cannot reach the quality of the water reused for flushing the toilet.
Due to the above-mentioned several problems, the use efficiency and development progress of the portable lavatory are limited. Therefore, the research and development of an in-situ sewage treatment and recycling method for the mobile toilet is an imminent problem for such products or industries.
Disclosure of Invention
In order to solve the technical problems, the invention provides a sewage in-situ treatment and recycling method for a mobile toilet, which can realize standard discharge of discharged water and recycling of treated water.
The invention is realized by the following technical scheme:
a sewage in-situ treatment and recycling method for a mobile toilet adopts a sewage in-situ treatment and recycling system for treatment, wherein the sewage in-situ treatment and recycling system comprises an adjusting tank, a water pump, a screw stacking machine, an anoxic tank, an aerobic tank, tubular ultrafiltration, nanofiltration and a recycling water tank which are sequentially connected through a pipeline; the method comprises the following steps:
1) after the sewage passes through an adjusting tank with a stirring paddle to uniformly mix the fecal sewage, the fecal sewage is further crushed by a water pump with self-absorption and crushing functions to obtain the fecal sewage;
2) the obtained fecal sewage enters a spiral shell stacking machine to concentrate and dehydrate the solid in the fecal sewage, the water content of the concentrated and dehydrated solid is less than or equal to 80 percent, and the obtained produced water enters an anoxic tank to carry out denitrification reaction so as to remove the total nitrogen in the target sewage and degrade soluble organic matters;
3) the produced water after the denitrification reaction treatment enters an aerobic tank, a complete mixed activated sludge method is adopted for nitration reaction and oxidation reaction of organic carbon, ammonia nitrogen and soluble organic matters in target sewage are further degraded, and then the separation of activated sludge and wastewater is realized through tubular ultrafiltration;
4) and removing a small amount of soluble organic matters in the ultrafiltration effluent through nanofiltration to obtain nanofiltration effluent with the standard water quality for toilet flushing water, wherein the nanofiltration concentrated water meets the water inlet requirement of a town sewer pipe network and is discharged into the town sewer pipe network.
According to the method for in-situ treatment and recycling of the sewage in the mobile toilet, the hydraulic retention time of the adjusting tank in the step 1) is preferably 2-3 hours.
The water content of the solid after the concentration and dehydration of the screw stacking machine is less than or equal to 80 percent. After concentration and dehydration, the water content of the solid is less than or equal to 80 percent, and the solid can be received and processed by qualified units after being bagged; the sewage which is separated out is called target sewage and enters a subsequent anoxic tank for treatment.
The anoxic tank controls the dissolved oxygen to be less than 0.5mg/L, the concentration of the activated sludge to be 10000-12000mg/L and the hydraulic retention time to be 3-5 hours.
The aerobic tank controls the dissolved oxygen within the range of 2-4mg/L, the concentration of the activated sludge is 10000-12000mg/L, and the hydraulic retention time is 10-15 hours.
The ratio of the reflux flow rate of the effluent of the aerobic tank flowing back to the water inlet end of the anoxic tank to the flow rate of the sewage is 2-3.
And a chemical phosphorus removal agent is preferably added at the tail end of the aerobic tank and used for reducing the total phosphorus in the target sewage to below 1 mg/L.
The recovery rate of nanofiltration water production is preferably 75-80%.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the method can meet the reuse water of the toilet flushing standard and the discharge concentrated water meeting the discharge requirement of urban sewers, thereby solving the water supply and drainage problems of the mobile toilet.
(2) In the solid-liquid separation process of the screw stacking machine, the produced solid reaches the moisture content required by outward transportation, meanwhile, the concentration of the solid matters remained in the target sewage is very low, the mechanical separation speed is high, and the occupied area is saved.
(3) The tubular ultrafiltration realizes the separation of the activated sludge and the target sewage, and has good sanitary condition because of the closed environment. And the separation speed is high, and the occupied area is saved.
(5) Nanofiltration realizes the remarkable improvement of the final produced water quality, and the produced water quality completely reaches the water quality standard of reuse in toilet flushing.
In addition, the active sludge concentration of the anoxic tank and the aerobic tank is high in the preferred scheme, so that the biochemical reaction speed is accelerated, and the reaction time is shortened. Chemical phosphorus removal agents are added at the tail end of the aerobic tank, so that the total phosphorus content in the target sewage can be effectively reduced.
Drawings
FIG. 1 is a schematic flow chart of an in-situ sewage treatment and recycling method for a mobile toilet
In the figure: 1 is an adjusting tank, 2 is a water pump, 3 is a screw stacking machine, 4 is an anoxic tank, 5 is an aerobic tank, 6 is a tubular ultrafiltration tank, 7 is nanofiltration tank, and 8 is a recycling water tank.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention relates to a sewage in-situ treatment and reuse method for a mobile toilet, which comprises the following specific implementation processes: the sewage in-situ treatment and recycling system is formed by connecting an adjusting tank, a water pump, a screw stacking machine, an anoxic tank, an aerobic tank, tubular ultrafiltration, nanofiltration and a recycling water tank in sequence by using pipelines. The specific process is as follows: fecal sewage generated by the mobile toilet firstly enters an adjusting tank, the adjusting tank is provided with a stirring paddle to realize uniform mixing of the fecal sewage, and the hydraulic retention time is taken to be 2.5 hours; the water outlet of the adjusting tank is injected into a screw stacking machine by a water pump for solid-liquid separation, and the water pump has a self-absorption function and a stirring function; concentrating and dewatering the solid by a screw stacking machine to ensure that the water content of the solid is about 80 percent, and feeding the sewage which is taken out and is called target sewage into a subsequent anoxic tank; mixing activated sludge and sewage in the anoxic tank by using a stirring paddle, controlling the concentration of dissolved oxygen to be 0.4mg/L, the concentration of activated sludge to be 110000mg/L, and controlling the hydraulic retention time to be 4 hours, wherein the effluent of the anoxic tank enters the aerobic tank; the aerobic tank adopts a completely mixed activated sludge method, the activated sludge and the sewage are uniformly mixed by aeration, the dissolved oxygen is controlled to be 2.5mg/L, the concentration of the activated sludge is 11000mg/L, the hydraulic retention time is 14 hours, a chemical phosphorus removal agent is added at the tail end of the aerobic tank for removing phosphorus, the water outlet part of the aerobic tank flows back to the water inlet end of the anoxic tank, the ratio of the reflux flow to the target sewage flow is 2.5, and the part of the water outlet field of the aerobic tank enters the tubular ultrafiltration; after the solid-liquid separation is carried out by tubular ultrafiltration, the produced water enters nanofiltration, and the activated sludge flows back to the water inlet end of the anoxic tank; nanofiltration is carried out to deeply remove soluble organic matters, the recovery rate of produced water is about 80 percent, the produced water enters a reuse water tank, and nanofiltration concentrated water reaches the standard and is discharged to a nearby town sewer pipe network.
The effluent of the screw stacking machine is used as target sewage, and the water quality is shown in the following table 1.
TABLE 1 target Water quality of wastewater
The finally produced recycled water and discharged concentrated water need to respectively meet the standards GB/T18920-2015 of urban water quality for recycling urban sewage and GB/T31962-2015 of quality standard for discharging sewage into urban sewer, and the main water qualities of the two standards are shown in Table 2.
TABLE 2 Water quality standards for recycled and outward discharge concentrate
The change of the target sewage quality after the aerobic tank, tubular ultrafiltration and nanofiltration is shown in Table 3.
TABLE 3 on-way Water quality Change of target Sewage
The invention and its embodiments have been described above, without this being limitative. Without departing from the spirit of the invention, it is within the scope of the invention to suggest and appreciate that structural embodiments and examples similar to the technical solutions can be devised without inventing.
Claims (7)
1. A sewage in-situ treatment and recycling method for a mobile toilet is characterized in that a sewage in-situ treatment and recycling system is adopted for treatment, and the sewage in-situ treatment and recycling system comprises an adjusting tank, a water pump, a screw stacking machine, an anoxic tank, an aerobic tank, tubular ultrafiltration, nanofiltration and a recycling water tank which are sequentially connected through a pipeline; the method comprises the following steps:
1) after the sewage passes through an adjusting tank with a stirring paddle to uniformly mix the fecal sewage, the fecal sewage is further crushed by a water pump with self-absorption and crushing functions to obtain the fecal sewage;
2) the fecal sewage obtained in the step 1) enters a stacking screw machine to concentrate and dehydrate the solid in the fecal sewage, the water content of the concentrated and dehydrated solid is less than or equal to 80%, and the produced water enters an anoxic tank to carry out denitrification reaction so as to remove the total nitrogen in the target sewage and degrade soluble organic matters;
3) the produced water after the denitrification reaction treatment enters an aerobic tank, a complete mixed activated sludge method is adopted for nitration reaction and oxidation reaction of organic carbon, ammonia nitrogen and soluble organic matters in target sewage are further degraded, and then the separation of activated sludge and wastewater is realized through tubular ultrafiltration;
4) and removing a small amount of soluble organic matters in the ultrafiltration effluent through nanofiltration to obtain nanofiltration effluent with the standard water quality for toilet flushing water, wherein the nanofiltration concentrated water meets the water inlet requirement of a town sewer pipe network and is discharged into the town sewer pipe network.
2. The method for in-situ treatment and reuse of sewage in a mobile toilet according to claim 1, wherein the method comprises the following steps: the hydraulic retention time of the regulating tank in the step 1) is 2-3 hours.
3. The method for in-situ treatment and reuse of sewage in a mobile toilet according to claim 1, wherein the method comprises the following steps: the anoxic tank controls the dissolved oxygen to be less than 0.5mg/L, the concentration of the activated sludge to be 10000-12000mg/L and the hydraulic retention time to be 3-5 hours.
4. The method for in-situ treatment and reuse of sewage in a mobile toilet according to claim 1, wherein the method comprises the following steps: the aerobic tank controls the dissolved oxygen to be 2-4mg/L, the concentration of the activated sludge to be 10000-12000mg/L and the hydraulic retention time to be 10-15 hours.
5. The method for in-situ treatment and reuse of sewage in a mobile toilet according to claim 1, wherein the method comprises the following steps: the ratio of the reflux flow rate of the effluent of the aerobic tank flowing back to the water inlet end of the anoxic tank to the flow rate of the sewage is 2-3.
6. The method for in-situ treatment and reuse of sewage in a mobile toilet according to claim 1, wherein the method comprises the following steps: and a chemical phosphorus removal agent is added at the tail end of the aerobic tank, and the addition amount is an amount which reduces the total phosphorus in the target sewage to below 1 mg/L.
7. The method for in-situ treatment and reuse of sewage in a mobile toilet according to claim 1, wherein the method comprises the following steps: the recovery rate of nanofiltration water production is 75-80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111606192.7A CN114380461A (en) | 2021-12-26 | 2021-12-26 | In-situ sewage treatment and reuse method for mobile toilet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111606192.7A CN114380461A (en) | 2021-12-26 | 2021-12-26 | In-situ sewage treatment and reuse method for mobile toilet |
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| CN114380461A true CN114380461A (en) | 2022-04-22 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2576709Y (en) * | 2002-09-04 | 2003-10-01 | 李明哲 | Night-soil water-water biological treatment circulation reusing apparatus |
| CN2598994Y (en) * | 2002-11-29 | 2004-01-14 | 上海太比雅科技有限公司 | Ecological circulating treatment system for water closet |
| CN2603080Y (en) * | 2003-03-04 | 2004-02-11 | 上海美申环境设施设备有限公司 | Excrement and urine sewage treatment and reuse device |
| CN1594763A (en) * | 2004-06-23 | 2005-03-16 | 南京大学 | Circulating water flushing ecological toilet and sewage treatment method thereof |
| KR100727577B1 (en) * | 2006-06-30 | 2007-06-14 | 이건기 | Non-discharge circulation flush toilet sewage treatment system |
| CN109650670A (en) * | 2019-01-25 | 2019-04-19 | 广州故乡源水处理有限公司 | The purification method of septic tank purification system |
-
2021
- 2021-12-26 CN CN202111606192.7A patent/CN114380461A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2576709Y (en) * | 2002-09-04 | 2003-10-01 | 李明哲 | Night-soil water-water biological treatment circulation reusing apparatus |
| CN2598994Y (en) * | 2002-11-29 | 2004-01-14 | 上海太比雅科技有限公司 | Ecological circulating treatment system for water closet |
| CN2603080Y (en) * | 2003-03-04 | 2004-02-11 | 上海美申环境设施设备有限公司 | Excrement and urine sewage treatment and reuse device |
| CN1594763A (en) * | 2004-06-23 | 2005-03-16 | 南京大学 | Circulating water flushing ecological toilet and sewage treatment method thereof |
| KR100727577B1 (en) * | 2006-06-30 | 2007-06-14 | 이건기 | Non-discharge circulation flush toilet sewage treatment system |
| CN109650670A (en) * | 2019-01-25 | 2019-04-19 | 广州故乡源水处理有限公司 | The purification method of septic tank purification system |
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