CN203529983U - Wastewater treatment system - Google Patents

Abstract

The wastewater treatment system provided by the utility model includes: a reaction tank body, including a water inlet and a water outlet, and the water inlet and water outlet are respectively arranged on the upper end of the side wall of the reaction tank body; an electrolysis device, including a positive plate, a negative electrode plate and a power supply, the positive plate and the negative plate are arranged in the reaction tank, the power supply is electrically connected to the positive plate and the negative plate; the electrolysis gas supply system includes an aeration tube and an air pump, and the aeration The air pipe is arranged at the bottom of the reaction tank, and the air pump is externally connected to the reaction tank; the catalytic material is filled in the reaction tank; the reaction tank is divided into multiple reaction tanks by insulating partition plates. tank body, and a communication pipe is arranged between two adjacent reaction tank bodies, and water enters the adjacent other reaction tank body from one of the reaction tank bodies through the communication pipe. In the case of electrification, there is a mutual induction electric field between the two adjacent reaction tanks, which effectively improves the overall electrocatalytic oxidation efficiency of the system and can effectively reduce working energy consumption.

Description

A waste water treatment system

technical field

The utility model belongs to the field of wastewater purification, in particular to a wastewater advanced treatment system.

Background technique

Saving resources and protecting the environment is a basic national policy of our country. During the "Twelfth Five-Year Plan" period, the national urban sewage treatment recycling rate will reach the goal of 10%, and more than 7 billion m ³ of fresh water resources can be saved every year, which can effectively alleviate the shortage of water resources in China, especially in arid areas. Therefore, wastewater reuse has important practical significance.

At present, the total sewage discharge in the country is more than 70 billion tons, and the national recycled water consumption is only 1.66 billion m ³ , accounting for only 2% of the national waste/sewage discharge, which is far from the goal of 10%. Therefore, to achieve this goal not only depends on macro-control factors such as the guidance of national policies and the adjustment of market water prices, but also requires the practical application of efficient, clean, low-investment, and low-cost reliable wastewater advanced treatment and reuse technologies. Therefore, reclaimed water The future investment space is very broad.

Reclaimed water refers to the discharge water that reaches the discharge standard after pretreatment and biochemical treatment of urban domestic sewage and production wastewater. After further treatment, it reaches the water quality standard for a certain purpose, such as industrial cooling water, urban garden landscape irrigation, etc. and reuse potential water resources for the production process. However, during the wastewater treatment process, the parent compounds in the raw sewage/wastewater have undergone significant changes, not only in the composition and properties of the compounds, but also in their molecular shape and size. Therefore, if biochemical methods continue to be used as the main purification process in advanced treatment, the removal efficiency of key water quality indicators such as COD (chemical oxygen demand) is often very low. At present, the common treatment technologies for reclaimed water include membrane technology, MBR method, Fenton reagent oxidation method, photocatalytic oxidation method, etc., or a combined process with other physical and chemical methods, such as flocculation and filtration. However, these combined processes not only have specific problems such as long treatment process, large floor space, and high operating costs; at the same time, a large amount of sludge will be generated during the treatment process. These sludges have high moisture content and high treatment costs, especially for sludge containing Class I pollutants. The direct discharge of sludge or improper sludge management makes the sewage treatment plant a new source of environmental pollution, which has attracted great attention from all walks of life and has become a new problem to be solved in the current wastewater treatment process.

The existing wastewater fluidized bed electrocatalytic oxidation advanced treatment reactor, on the basis of the traditional wastewater electrolysis treatment technology, adds an electrolytic catalyst to the electrolytic cell, so that the treatment effect and treatment efficiency of low concentration refractory wastewater are improved. Substantial improvement; Compared with the current three-dimensional electrolysis technology of wastewater, this technology uses a fluidized bed instead of a fixed bed, and the risk of catalyst deactivation and fouling is greatly reduced. Due to the strong catalytic activity of the catalyst for DO and the excellent mechanical stability of the catalyst, the pollutants are almost completely degraded during the treatment process and are not easily pulverized. Therefore, the biggest difference between this technology and traditional electrolysis and three-dimensional electrolysis technology is its treatment process. Clean, no or less sludge generation. The field test results of a variety of production wastewater show that the technical system has high equipment volume efficiency, good treatment effect, low or no advanced treatment of the effluent of the domestic sewage treatment system, the effluent of the biochemical system of printing and dyeing wastewater, and the effluent of the biochemical treatment system of the refinery. There are many technical advantages such as sludge production, stable effluent quality, low operating cost, low energy consumption, high degree of automation, simple operation, and good compatibility with the original water treatment system.

However, after long-term on-site test research and user practice investigations of many sewage/wastewater treatment plants, it is found that the overall structure still needs to be optimized to meet the fluctuating requirements of users for treating water volume.

Utility model content

In view of this, the utility model provides a wastewater treatment system, which has high efficiency, low energy consumption, low comprehensive treatment, clean treatment process, and no or less sludge generation.

In order to achieve the above object, the utility model provides the following technical solutions:

A wastewater treatment system comprising:

The reaction tank body includes a water inlet and a water outlet, and the water inlet and water outlet are respectively arranged on the upper end of the side wall of the reaction tank;

An electrolysis device, including a positive plate, a negative plate and a power supply, the positive plate and the negative plate are arranged in the reaction tank, and the power supply is electrically connected to the positive plate and the negative plate;

The electrolysis gas supply system includes an aeration pipe and an air pump, the aeration pipe is arranged at the bottom of the reaction tank, and the air pump is externally connected to the reaction tank;

Catalytic material, packed in the reaction tank;

The reaction tank is divided into a plurality of reaction tanks by an insulating partition plate, and a communication pipe is provided between two adjacent reaction tanks, and water enters from one of the reaction tanks into the adjacent other through the communication pipe. A reaction tank.

Preferably, the multiple reaction tanks have the same volume.

Preferably, the connecting pipe is a three-way pipe.

Preferably, the water inlet is provided with a central water inlet pipe and a valve, and the water inlet can supply water to each reaction tank respectively.

Preferably, the positive electrode plate and the negative electrode plate are respectively arranged on both sides of the reaction tank, and the aeration pipe is arranged at the bottom of the reaction tank.

Preferably, the reaction tank body is formed by processing PP board or PVC board.

Preferably, the catalytic material packed in the reaction tank accounts for 30%-60% of the volume of each reaction tank.

Compared with the prior art, in the wastewater treatment system of the present utility model, the reaction tank is divided into multiple reaction tanks by an insulating partition plate, and a connecting pipe is provided between two adjacent reaction tanks, Water enters the adjacent reaction tank from one of the reaction tanks through the communication pipe. On the one hand, when the production load is not saturated, one or several of the reaction tanks can be selectively used to reduce energy consumption; on the other hand, during the working process, when water passes between two adjacent reaction tanks When there is a connecting tube between them, the connecting tube has a salt bridge effect, and in the case of electrification, there is a mutual inductance electric field between the two adjacent reaction tanks, which changes the electric field under the same electrode conditions when the single cell is working. The spatial distribution pattern of intensity effectively improves the overall electrocatalytic oxidation efficiency of the system, reduces the optimal working voltage, and effectively reduces working energy consumption.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a wastewater treatment system provided in a specific embodiment of the present invention.

Detailed ways

The existing single-tank wastewater treatment system cannot meet the fluctuating requirements of users to treat water volume, and its energy consumption and overall electrocatalytic oxidation efficiency need to be optimized.

In view of the above-mentioned problems existing in the prior art, the utility model discloses a wastewater treatment system, comprising:

The reaction tank body includes a water inlet and a water outlet, and the water inlet and water outlet are respectively arranged on the upper end of the side wall of the reaction tank body;

An electrolysis device, including a positive plate, a negative plate and a power supply, the positive plate and the negative plate are arranged in the reaction tank, and the power supply is electrically connected to the positive plate and the negative plate;

The electrolysis gas supply system includes an aeration pipe and an air pump, the aeration pipe is arranged at the bottom of the reaction tank, and the air pump is externally connected to the reaction tank;

Catalytic material, packed in the reaction tank;

The reaction tank is divided into a plurality of reaction tanks by an insulating partition plate, and a communication pipe is provided between two adjacent reaction tanks, and water enters from one of the reaction tanks into the adjacent other through the communication pipe. A reaction tank.

Preferably, the multiple reaction tanks have the same volume.

Preferably, the connecting pipe is a three-way pipe.

Preferably, the water inlet is provided with a central water inlet pipe and a valve, and the water inlet can supply water to each reaction tank respectively.

Preferably, the positive electrode plate and the negative electrode plate are respectively arranged on both sides of the reaction tank, and the aeration pipe is arranged at the bottom of the reaction tank.

Preferably, the reaction tank body is formed by processing PP board or PVC board.

Preferably, the catalytic material packed in the reaction tank accounts for 30%-60% of the volume of each reaction tank.

In the wastewater treatment system disclosed by the utility model, the reaction tank is divided into multiple reaction tanks by an insulating partition plate, and a connecting pipe is arranged between two adjacent reaction tanks, and water passes through the connecting pipe From one of the reaction tanks, it enters the other adjacent reaction tank. On the one hand, when the production load is not saturated, one or several of the reaction tanks can be selectively used to reduce energy consumption; on the other hand, during the working process, when water passes between two adjacent reaction tanks When there is a connecting tube between them, the connecting tube has a salt bridge effect, and in the case of electrification, there is a mutual inductance electric field between the two adjacent reaction tanks, which changes the electric field under the same electrode conditions when the single cell is working. The spatial distribution pattern of intensity effectively improves the overall electrocatalytic oxidation efficiency of the system, reduces the optimal working voltage, and effectively reduces working energy consumption.

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only part of the embodiments of the utility model , but not all examples. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Fig. 1, the utility model discloses a wastewater treatment system, comprising:

The reaction tank 1 includes a water inlet 2 and a water outlet 3, and the water inlet 2 and the water outlet 3 are respectively arranged at the upper end of the side wall of the reaction tank 1. The reaction tank body 1 is preferably arranged in a rectangular shape, which is processed by PP board or PVC board. Of course, the shape of the reaction tank body 1 can be set to other shapes, such as a cylinder.

The electrolysis device includes a positive plate 4 , a negative plate 5 and a power supply 6 , the positive plate 4 and the negative plate 5 are arranged in the reaction tank 1 , and the power supply 6 is electrically connected to the positive plate 4 and the negative plate 5 . In the preferred embodiment of the present invention, the positive plate 4 and the negative plate 5 are both graphite electrode plates, of course, the graphite electrode plates here can be replaced by 316L stainless steel plates. A plurality of graphite electrode plates are arranged at certain intervals along the direction from left to right in the reaction tank body 1, and are electrically connected to the positive and negative output terminals of the configured power supply 6 according to the positive and negative interactive method, and the power supply 6 A DC power supply is preferred. The positive electrode plate 4 and the negative electrode plate 5 are perpendicular to the bottom plate of the reaction tank body 1 . In practical applications, due to the limitation of the volume of the reaction tank body 1, the positive electrode plate 4 and the negative electrode plate 5 can only be arranged as a group, that is, there is only one positive electrode plate 4 and one negative electrode plate 5, and they are respectively arranged on the two sides of the reaction tank body 1. side.

The electrolysis gas supply system includes an aeration tube 7 and an air pump 8. The aeration tube 7 is arranged at the bottom of the reaction tank 1, and the air pump 8 is externally connected to the reaction tank 1. Of course, the air pump 8 can also be arranged in the reaction tank in the gap of body 1. Aeration tube 7 is provided with a plurality of, and is distributed in the bottom of reaction tank body 1 in parallel, and aeration tube 7 is preferably arranged parallel to positive plate 4 or negative plate 5, and further, aeration tube 7 is preferably arranged on adjacent positive electrode between plate 4 and negative plate 5. The pores of the aeration pipe 7 face downwards to prevent being blocked by the catalytic material particles in the reaction tank body 1 . The air pump 8 is connected to the aeration pipe 7, which can provide oxygen for the negative plate 5 in the reaction tank 11 to generate active oxygen species during power supply activation, and also provide the catalytic material with directional circulation power, thereby deactivating the catalytic material and The fouling risk is greatly reduced, and the catalytic efficiency of the catalytic material is greatly improved. The electrolysis gas supply system may also include an air flow meter or an air valve, etc. In other embodiments, only one aeration tube 7 may be provided.

Catalyst material is filled in the reaction tank body 1 . In a preferred embodiment of the present invention, the catalytic material is carbon-based or silicon dioxide-based particles loaded with transition metals, and the catalytic material may also be doped with titanium dioxide. The catalytic material can not only selectively enrich pollutants from low-concentration wastewater, but also has high electrocatalytic activation performance. Catalytic materials are added to the reaction tank body 1, so that the treatment effect and treatment efficiency of low-concentration refractory wastewater are greatly improved. The loading amount of the catalytic material is preferably 30%-60% of the volume of each reaction tank.

In a preferred embodiment of the present utility model, the reaction tank body 1 is divided into two reaction tank bodies by an insulating partition plate 9, which are respectively a first reaction tank body 11 and a second reaction tank body 12, and the first reaction tank body 11 A communication pipe 10 is provided between the second reaction tank body 12 , and water enters the adjacent second reaction tank body 12 from the first reaction tank body 11 through the communication pipe 10 . Preferably, the communication pipe 10 is a three-way pipe.

Experiments have shown that when water passes through the adjacent first reaction tank body 11 and the second reaction tank body 12, the connecting pipe 10 has a salt bridge effect. There is a mutual inductance electric field between the bodies 12, which changes the spatial distribution pattern of the electric field intensity under the same electrode conditions when the single cell is working, thereby effectively improving the overall electrocatalytic oxidation efficiency of the system and effectively reducing energy consumption.

In a preferred embodiment of the present utility model, the upper end of the junction of the first reaction tank body 11 and the second reaction tank body 12 is provided with a water inlet 2, and the upper end of the second reaction tank body 12 on the right side wall is provided with a water outlet 3 , the water outlet 3 is preferably lower than the height of the water inlet 2 . The lower end of the first reaction tank 11 can also be provided with an emptying port 13, and the emptying port 13 can discharge the waste water in the first reaction tank 11 and the second reaction tank 12 when the waste water treatment system is not in use. The water inlet 2, the water outlet 3 and the emptying port 13 can be provided with valves respectively, and the water inlet 2 is also provided with a central water inlet pipe (not shown), so that the water inlet 2 can flow to the first reaction tank body 11 and the second reaction tank respectively. The reaction tank body 12 is supplied with water. The use of this intermediate water inlet and water distribution system facilitates water inlet management when the two pools work alone without adding pipelines.

Further, the first reaction tank body 11 and the second reaction tank body 12 have the same volume. Of course, the sizes of the first reaction tank body 11 and the second reaction tank body 12 can also be adjusted according to actual needs, so as to meet the treatment requirements of different types of industrial wastewater.

During use, when water passes through the first reaction tank body 11 and the second reaction tank body 12, the connecting pipe 10 has a salt bridge effect. There is a mutual inductance electric field between the reaction tanks 12, which changes the spatial distribution pattern of the electric field intensity under the same electrode conditions when the single cell is working, thereby effectively improving the overall electrocatalytic oxidation efficiency of the system.

In the waste water treatment system disclosed by the utility model, the average voltage of the mutual inductance electric field measured on the laboratory small-scale experimental device is shown in the following table (note: the effective volume of the experimental device is 400mL, the distance between each pair of working electrodes is 2cm, and the length of the electrolytic cell 10cm, there are 3 pairs of 316L stainless steel working electrodes in total. When one of the reaction tanks is powered off, the other reaction tank generates induced voltage to the reaction tank (the space distribution in the pool):

It can be seen from the above table that with the wastewater treatment system disclosed in the present invention, there is a mutual inductance electric field between the first reaction tank body 11 and the second reaction tank body 12 under the condition of electrification, and the maximum value of the mutual inductance electric field reaches 4.45 V. Due to the existence of the mutual inductance electric field, the optimal working voltage of the wastewater treatment system can be effectively reduced. On the basis of the traditional single-cell optimal operating voltage of 9V, the optimal operating voltage of the wastewater treatment system disclosed by the utility model can be reduced to 6V or so, thus effectively reducing energy consumption and operating costs.

The waste water treatment system disclosed by the utility model, when producing at full capacity, turn on the system water inlet pump, power supply 6, and air pump 8, and the waste water enters from the central water inlet pipe, and enters the first reaction tank 11 after being measured by the flow meter. And enter the second reaction tank 12 through the first reaction tank 11 through the connecting pipe 10 for electrocatalytic oxidation treatment. The average individual reaction time (ie hydraulic retention time) of the two pools is 10 minutes, and the total reaction time is 20 minutes; when the production load When it is halved, or when it is necessary to carry out equipment maintenance without stopping the shutdown, a single pool can be used to work independently, that is, only the first reaction tank 11 is used to treat the waste water. At this time, the waste water enters the first reaction tank from the central water inlet pipe. The tank body 11 is subjected to electrocatalytic oxidation treatment, and the reaction time is 20 minutes, which has the advantage of flexible operation.

The effect of the wastewater treatment system 10 provided by the present invention will be described in detail below in conjunction with the examples.

Example 1

Analysis of the treatment effect of the effluent after biochemical treatment of oil refinery wastewater.

Refining wastewater is refractory wastewater. The refining process consumes a lot of water, and the water quality of the discharged wastewater is complex and highly volatile. Using the above-mentioned wastewater treatment system with a treatment capacity of 60L/h, a 30-day on-site continuous operation test was carried out on the wastewater discharged from an oil refinery after biochemical treatment. The results show that: when the influent water quality index COD fluctuates between 80.0-360mg/L, the average value is 220mg/L; when the ammonia nitrogen concentration is around 40.0mg/L, the control reaction time is 20min, and the COD of the system effluent after the reaction is lower than 50mg/L, the average removal rate can reach 80.1%; the concentration of ammonia nitrogen in the effluent is lower than 4mg/L, and the removal rate of ammonia nitrogen reaches more than 90%; the average sludge production of the system at the end of electrolysis is lower than 50mg per liter of wastewater. Moreover, the effluent quality is good and the change is stable, which shows that the system has good impact resistance to organic matter.

Example 2

Analysis of the treatment effect of printing and dyeing wastewater after biochemical treatment.

The printing and dyeing industry consumes a lot of water, the water quality is complicated, and the concentration of pollutants fluctuates greatly. Using the above-mentioned wastewater treatment system with a treatment capacity of 60L/h, a 3-week on-site continuous operation test was carried out on the biochemical discharge water of a number of printing and dyeing wastewater. The main water quality indicators of the experimental water are: the COD fluctuation of the influent water quality index is between 80-120mg/L, and the average value is 100mg/L; the chroma is 40-80, and the average value is 60. The reaction time was controlled at 20 min during the experiment. The effluent results show that the average COD removal rate of the device can still reach 70%, the effluent COD is lower than 50mg/L, and the chroma removal rate is close to 100%; the average sludge production of the system at the end of electrolysis is lower than 60mg per liter of wastewater . The effluent water quality is good and the change is stable, and the effect is good, which can meet the water quality standard requirements of reuse water.

Example 3

Analysis of the advanced treatment effect of effluent after biochemical treatment of domestic wastewater.

The production of domestic wastewater has now exceeded the discharge of industrial wastewater, becoming the main source of wastewater in my country's wastewater treatment industry, and it is also the most important potential water source in the field of reuse in the future. According to the current domestic sewage discharge standards in our country, the COD of the treated discharge water is required to be lower than the standard of 50 or 60mg/L. In the Taihu Lake Basin in Jiangsu Province, COD is required to be lower than 50, and ammonia nitrogen is lower than 5 or 8mg/L. But this standard is for some old sewage treatment plants, the COD requirement is lower than 80 or 120mg/L in the process design, and there is no standard requirement for ammonia nitrogen. Therefore, this technology is suitable for the technical transformation of old sewage treatment plants and the future wastewater reuse basin. Using the above-mentioned wastewater treatment system with a treatment capacity of 60L/h, a 30-day field test was conducted on an old sewage treatment plant. The test water quality was: the COD fluctuation of the influent water quality index was between 60-150mg/L, and the average value was 105mg/L. When; ammonia nitrogen is 20-60mg/L, and the average value is 40mg/L. The reaction time was controlled at 20 min during the experiment. The effluent results show that the average COD removal rate of the device can still reach 70%, and the ammonia nitrogen removal rate is close to 100%; the average sludge production of the system at the end of electrolysis is less than 30 mg per liter of wastewater. The effluent water quality is good and the change is stable, and the effect is good, which can meet the water quality standard requirements of reuse water.

The above results show that the wastewater treatment system of the present invention can be widely used in different wastewater treatment, and the treatment effect is good, the system has low mud production, low energy consumption, clean process, low comprehensive treatment cost, and has great market prospects .

In summary, the wastewater treatment system disclosed by the utility model not only changes the traditional electrocatalytic device with a certain effective working area or volume of a single electrolytic cell, but the wastewater treatment system disclosed by the utility model is separated into Two equal-area or equal-volume dual-reaction tanks that can work independently (the two structures are exactly the same). When the production is at full capacity, the first reaction tank 11 and the second reaction tank 12 are connected in series, and the total electrolytic reaction time is still 20 minutes (consistent with the single-cell operation), but at this time, the waste water treatment can be effectively improved. At the same time, the energy consumption of the system is reduced; when the first reaction tank 11 or the second reaction tank 12 is used alone, the electrolytic reaction time remains unchanged, which is still 20 minutes, so as to meet the production load halving or equipment maintenance When a single pool works independently and does not stop working, it also reduces energy consumption by 50% accordingly.

The two-pool waste water treatment system with salt bridge effect disclosed by the utility model has the flexible operation characteristics of high oxidation efficiency, low energy consumption, and single pool can work independently, and maintains the traditional fluidized bed electrocatalytic treatment technology system Technical advantages of no or less sludge generation.

Moreover, the field test results of a variety of production wastewater show that the technical system has high equipment volume efficiency, good treatment effect, low or There are many technical advantages such as no sludge generation, stable effluent quality, low operating cost, low energy consumption, high degree of automation, simple operation, and good compatibility with the original water treatment system.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. a Waste Water Treatment, comprising:

Reaction cell body, includes the mouth of a river and water outlet, and described water inlet and water outlet are located at respectively the upper end of described reactive tank body sidewall;

Electrolyzer, comprises positive plate, negative plate and power supply, and described positive plate and negative plate are located in described reaction cell body, and described power supply is electrically connected at described positive plate and negative plate;

Electrolysis airing system, comprises aeration tube and pneumatic pump, and described aeration tube is located at the bottom of described reaction cell body, and described pneumatic pump is external in described reaction cell body;

Catalytic material, fills in described reaction cell body;

It is characterized in that: described reaction cell body is separated into a plurality of reaction cell bodies by the division plate that insulate, and be provided with closed tube between adjacent two reaction cell bodies, water enters another adjacent reaction cell body by described closed tube from one of them reaction cell body.

2. Waste Water Treatment according to claim 1, is characterized in that: the volume of described a plurality of reaction cell bodies is identical.

3. Waste Water Treatment according to claim 1, is characterized in that: described closed tube is Y-tube.

4. Waste Water Treatment according to claim 1, is characterized in that: described water inlet is provided with center water inlet pipe and valve, and described water inlet can supply water to each reaction cell body respectively.

5. Waste Water Treatment according to claim 1, is characterized in that: described positive plate and negative plate are located at respectively the both sides of described reaction cell body, and described aeration tube is located at the bottom of described reaction cell body.

6. Waste Water Treatment according to claim 1, is characterized in that: described reaction cell body is processed to form by PP plate or PVC plate.

7. Waste Water Treatment according to claim 1, is characterized in that: fill in the 30%-60% that catalytic material in described reaction cell body accounts for each reactive tank body bulk.

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