A sewage recycling system

Abstract

The present application relates to the technical field of hazardous waste treatment, and in particular to a sewage recovery system, which includes a storage tank, an overflow tank, a sedimentation tank and a clear water tank, wherein the storage tank and the overflow tank are interconnected, a medicine barrel is arranged on the side of the overflow tank away from the storage tank, the medicine barrel and the overflow tank are interconnected and medicine is introduced into the overflow tank to remove impurities in the sewage, the sedimentation tank and the overflow tank are interconnected to settle flocculants in the sewage, and the clear water tank and the sedimentation tank are interconnected to receive dischargeable water. The present application has the effect of reducing the cost of sewage treatment while making the sewage meet the discharge standard.

Description

Technical Field

[0001] The present application relates to the technical field of hazardous waste treatment, and in particular to a sewage recovery system. Background Art

[0002] The wastewater generated by chemical plants includes chemical wastewater and domestic wastewater. Neither of them can be discharged directly, so relevant treatment is required to meet the discharge standards. Among the existing methods for treating wastewater, biological oxidation reaction is one of the most common treatment methods, which uses the metabolic activities of microorganisms to degrade and remove organic matter and other pollutants in wastewater, so that the wastewater meets the discharge standards.

[0003] During the biological oxidation process, microorganisms degrade organic matter through metabolic activities and also produce some gaseous byproducts, mainly including carbon dioxide, methane, hydrogen sulfide, ammonia, etc. If these waste gases are not properly treated and directly discharged into the atmosphere, they may have certain impacts on the environment and human health.

[0004] In order to reduce the impact of waste gas generated by biological oxidation on the environment and human body, it is usually necessary to select appropriate waste gas treatment methods according to specific circumstances to ensure that waste gas emissions meet relevant environmental protection standards. However, the waste gas treatment process makes the sewage treatment process more complicated and increases the treatment cost. Utility Model Content

[0005] In order to make sewage meet the discharge standards while reducing sewage treatment costs, the present application provides a sewage recovery system.

[0006] The sewage recycling system provided in this application adopts the following technical solution:

[0007] A sewage recovery system comprises a storage tank, an overflow tank, a sedimentation tank and a clear water tank, wherein the storage tank is interconnected with the overflow tank, a reagent barrel is arranged on the side of the overflow tank away from the storage tank, the reagent barrel is interconnected with the overflow tank and reagent is introduced into the overflow tank to remove impurities in the sewage, the sedimentation tank is interconnected with the overflow tank to settle flocculants in the sewage, and the clear water tank is interconnected with the sedimentation tank to receive dischargeable water.

[0008] By adopting the above technical solution, the storage tank can collect and store sewage, the reagent barrel introduces the reagent into the overflow tank, and the harmful substances in the sewage are effectively decomposed, precipitated or converted through chemical treatment methods, so as to remove impurities in the sewage and improve the sewage treatment effect. The setting of the sedimentation tank can settle and separate the flocculants in the sewage, effectively remove the suspended matter, colloid substances, etc. in the sewage, and further improve the degree of water purification. As the last checkpoint before discharge, the clear water tank receives the treated dischargeable water to ensure that the discharged water quality meets the relevant environmental protection standards and requirements. The sewage recovery system has a simple structure, convenient operation and stable operation. No waste gas is generated during the sewage treatment process, which reduces the links of waste gas treatment and thus reduces the treatment cost.

[0009] Furthermore, the medicine barrel includes a first medicine barrel, a second medicine barrel and a third medicine barrel for containing different medicines, and the first medicine barrel, the second medicine barrel and the third medicine barrel are all provided with a lifting pump in a one-to-one correspondence;

[0010] The overflow tank includes a primary overflow tank, a secondary overflow tank, a tertiary overflow tank and a quaternary overflow tank which are interconnected. The oil decomposer contained in the first reagent barrel is passed into the primary overflow tank through the lifting pump, the nitrate decomposing agent in the second reagent barrel is passed into the secondary overflow tank through the lifting pump, and the flocculant in the third reagent barrel is passed into the tertiary overflow tank through the lifting pump.

[0011] By adopting the above technical solution, the oil decomposer in the first reagent barrel decomposes the oil substances in the first overflow tank; the nitrification agent in the second reagent barrel nitrates the ammonia nitrogen in the second overflow tank; the flocculant in the third reagent barrel condenses the impurities in the third overflow tank, and the sewage with flocculants is further clarified and stabilized in the fourth overflow tank, and finally flows into the sedimentation tank. Corresponding lifting pumps are set for multiple reagent barrels to achieve the effect of precise delivery of different reagents. Each reagent has a specific function, and the staged treatment method improves the effect of sewage treatment. The lifting pump on each reagent barrel can ensure that the reagent is delivered to the corresponding overflow tank according to the predetermined amount and speed, thereby ensuring the stability and controllability of the treatment process.

[0012] Furthermore, a first baffle is provided between the first overflow tank and the second overflow tank, and a first overflow port is provided at the lower part of the first baffle;

[0013] A second baffle is provided between the secondary overflow pool and the tertiary overflow pool, and a second overflow port is provided on the upper portion of the second baffle;

[0014] A third partition is provided between the third-level overflow pool and the fourth-level overflow pool, and a third overflow port is provided at the lower part of the third partition;

[0015] The fourth overflow tank is provided with a fourth overflow port on one side close to the sedimentation tank. A drainage elbow fixedly connected to the fourth overflow tank is arranged in the fourth overflow port. The sedimentation tank and the fourth overflow tank are interconnected through the drainage elbow.

[0016] By adopting the above technical solution, the multi-level overflow tanks are interconnected, and the partitions and overflow ports at different positions are used to achieve step-by-step treatment and effective separation of sewage. In addition, the drainage elbow can be used to connect the four-level overflow tank with the sedimentation tank on the one hand, and slow down the water flow speed through its curved structure on the other hand.

[0017] Furthermore, the first-level overflow tank, the second-level overflow tank, and the third-level overflow tank are all provided with stirring devices for mixing medicines.

[0018] By adopting the above technical solution, stirring devices are respectively provided in the primary, secondary and tertiary overflow tanks, which can ensure that the reagents are fully mixed with the sewage, thereby improving the reaction efficiency and utilization rate of the reagents. The stirring device can evenly disperse the reagents into the sewage, avoid local accumulation or waste of the reagents, and make the treatment process more uniform and efficient. The stirring device helps to promote the decomposition and coagulation process of oil substances, ammonia nitrogen and impurities in the sewage. Through stirring, the reagents can better contact and react with the target substances in the sewage, accelerate the process of decomposition and coagulation, and improve the treatment effect. At the same time, stirring also helps to prevent the suspended matter and sediment in the sewage from accumulating at the bottom of the pool, and maintain the continuity and stability of the treatment process.

[0019] Furthermore, a guide plate for guiding the sedimentation of flocs is provided in the sedimentation tank, and the guide plate is located below the drainage elbow. A plurality of honeycomb channels for the flocs to pass through are opened on the guide plate, and each of the honeycomb channels is arranged to be inclined downward from one side of the drainage elbow to a side away from the drainage elbow.

[0020] By adopting the above technical solution, the guide plate is arranged in the sedimentation tank and is located below the drain elbow, so that the water flow path discharged from the drain elbow is optimized, and the honeycomb channel allows the floccules to pass smoothly and continue to settle. The downward slanting design of the honeycomb channel helps to accelerate the sedimentation speed of the floccules. Since the honeycomb channel has a certain inclination angle, the floccules are affected by gravity in the channel, so that the floccules in the sewage are better guided and distributed during the sedimentation process. On the one hand, the guide plate ensures that the floccules can smoothly enter the bottom of the sedimentation tank, and can also avoid the blockage problem that may occur in the traditional sedimentation tank, thereby improving the sedimentation effect and the efficiency of sewage treatment.

[0021] Furthermore, the clean water tank is fixedly connected to a side of the sedimentation tank close to the reagent barrel, and a water outlet interconnected with the clean water tank is provided on a side wall of the sedimentation tank.

[0022] By adopting the above technical solution, the clean water tank is fixedly connected to the side of the sedimentation tank close to the reagent barrel, and a water outlet interconnected with the clean water tank is provided. The clean water treated in the sedimentation tank can flow quickly and smoothly into the clean water tank through the water outlet. At the same time, this layout makes the process of the entire sewage recovery system more compact and efficient.

[0023] Furthermore, a water trough is fixedly connected to the inner wall of the sedimentation tank on a side away from the overflow tank, and the water trough and the water outlet are communicated with each other.

[0024] By adopting the above technical solution, a water flow trough is set on the inner wall of the sedimentation tank away from the overflow tank, so that the upper clear liquid of the sedimentation tank can flow into the water flow trough, and the water flow trough and the water outlet are interconnected, thereby realizing the smooth flow of water from the sedimentation tank to the clear water tank, and improving the treatment efficiency of the entire sewage recovery system.

[0025] Furthermore, a toothed baffle for filtering floating foam is provided on one side of the water trough close to the overflow tank.

[0026] By adopting the above technical solution, in the sewage treatment process, floating foam is a common byproduct. If it is not treated, it will flow into the subsequent treatment stage with the water flow, affecting the treatment effect. The toothed baffle is set on the side of the water trough close to the overflow tank, which can filter the clean water before it flows into the clean water tank. The toothed baffle can use its special shape and structure to effectively intercept and remove floating foam, prevent floating foam from entering the clean water tank, and ensure that the water quality meets the discharge standard.

[0027] Furthermore, a sedimentation bucket for settling flocculants is provided at the lower part of the sedimentation tank, and a sewage pipe is provided on the side of the sedimentation bucket away from the medicine barrel, and the sewage pipe is connected to the interior of the sedimentation bucket.

[0028] By adopting the above technical solution, the sedimentation bucket helps to further separate and remove floccules in sewage. In the sewage treatment process, floccules are common suspended solids. If they are not effectively removed, they will affect the effluent water quality. The sedimentation bucket can slow down the flow and cause the floccules to settle to the bottom under the action of gravity through its special structural design, thereby achieving effective separation of the floccules. The setting of the sewage pipe makes it easy to discharge the floccules collected in the sedimentation bucket. By connecting the sewage pipe, the floccules in the sedimentation bucket can be directly discharged to the designated treatment area.

[0029] Furthermore, there are several storage tanks for storing sewage from different sources.

[0030] By adopting the above technical solution, the setting of multiple storage tanks helps to achieve classified storage and treatment of sewage. Sewage from different sources may contain different pollutants and components, and their treatment methods and requirements may also be different. The setting of multiple storage tanks can ensure that sewage from different sources enters relatively independent storage tanks respectively, avoiding cross contamination before sewage treatment.

[0031] In summary, the present application includes at least one of the following beneficial technical effects: the overall process of the sewage recovery system is clear, from the storage tank to the overflow tank, the sedimentation tank, and then to the clear water tank, forming a complete sewage treatment chain, ensuring that the sewage can pass through each treatment stage in an orderly and efficient manner, and finally achieve standard discharge or reuse;

[0032] The design of multi-level overflow tanks and the introduction of different reagent barrels enable the system to effectively treat different pollutants in sewage. By adding different reagents to overflow tanks at different levels, oil substances, ammonia nitrogen and impurities can be removed separately, improving the treatment effect and efficiency. The setting of the stirring device ensures that the reagent and sewage can be fully mixed, improving the reaction efficiency and utilization rate of the reagent;

[0033] The sedimentation tank guides the flocculants to settle through guide plates and honeycomb channels, and sinks them into the sedimentation bucket to further improve the sedimentation effect. The setting of the clean water tank enables the treated clean water to be stored and reused. The design of the water trough and toothed baffle prevents impurities such as floating foam from entering the clean water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of a sewage recovery system in an embodiment of the present application. Figure 1 .

[0035] Figure 2 This is a schematic diagram of the overall structure of a sewage recovery system in an embodiment of the present application. Figure 2 .

[0036] Figure 3 It is a schematic cross-sectional view of the overflow tank in the embodiment of the present application.

[0037] Figure 4 This is a schematic diagram of the structure explosion of a sewage recovery system in an embodiment of the present application. Figure 1 .

[0038] Figure 5 This is a schematic diagram of the structure explosion of a sewage recovery system in an embodiment of the present application. Figure 2 .

[0039] Explanation of the reference numerals: 1. storage tank; 2. overflow tank; 21. primary overflow tank; 211. first partition; 2111. first overflow port; 22. secondary overflow tank; 221. second partition; 2211. second overflow port; 23. tertiary overflow tank; 231. third partition; 2311. third overflow port; 24. fourth overflow tank; 241. drain elbow; 2411. fourth overflow port; 25. stirring device; 3. sedimentation tank; 31. guide plate; 311. honeycomb channel; 32. water trough; 33. toothed baffle; 34. sedimentation bucket; 35. sewage pipe; 4. clear water tank; 41. water port; 5. medicine barrel; 51. first medicine barrel; 52. second medicine barrel; 53. third medicine barrel; 54. lifting pump; 6. operating platform; 61. stairs. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-5 And embodiments, the present application is further described in detail.

[0041] The present application embodiment discloses a sewage recovery system. Figure 1 and Figure 2 The sewage recovery system includes a storage tank 1, an overflow tank 2, a sedimentation tank 3, a clean water tank 4 and a medicine barrel 5. The overflow tank 2 is arranged at an adjacent position to the storage tank 1 for receiving sewage and performing graded treatment on the sewage. The medicine barrel 5 is arranged at an adjacent position on one side of the overflow tank 2. The liquid medicine in the medicine barrel 5 is passed into the overflow tank 2 and harmful substances in the sewage are removed, thereby forming turbid water. The sedimentation tank 3 is arranged in parallel with the overflow tank 2 and is fixedly connected to a side of the overflow tank 2 away from the storage tank 1. Flocculants in the turbid water settle in the sedimentation tank 3. The clean water tank 4 is fixedly connected to a side of the sedimentation tank 3 close to the medicine barrel 5 for receiving and holding the upper clear liquid of the sedimentation tank 3.

[0042] Reference Figure 1 and Figure 2 In order to collect and store sewage from different sources, the number of storage tanks 1 can be several and adjusted according to the actual sewage output. In this embodiment, the number of storage tanks 1 is preferably four, which are mainly used to collect chemical sewage and domestic sewage generated in the factory area. The storage tank 1 is connected to the overflow tank 2 through a pipeline, and the sewage is passed from the storage tank 1 to the overflow tank 2 for graded treatment.

[0043] Reference Figure 2 and Figure 3The overflow pool 2 in this embodiment is a rectangular tank body, and the first partition 211, the second partition 221 and the third partition 231 are equidistantly arranged in the overflow pool 2. The first partition 211, the second partition 221 and the third partition 231 are vertically fixedly connected to the side wall of the overflow pool 2 to divide the overflow pool 2 into a primary overflow pool 21, a secondary overflow pool 22, a tertiary overflow pool 23 and a quaternary overflow pool 24. A first overflow port 2111 is arranged at the lower part of the first partition 211, a second overflow port 2211 is arranged at the upper part of the second partition 221, and a third overflow port 2311 is arranged at the lower part of the third partition 231.

[0044] The medicine barrel 5 is used to hold liquid medicines with different functions, and the number of medicine barrels 5 can be increased or decreased according to actual needs. In this embodiment, the medicine barrel 5 includes a first medicine barrel 51, a second medicine barrel 52 and a third medicine barrel 53, wherein the first medicine barrel 51 contains NaOH and carbon powder, the second medicine barrel 52 contains sodium hypochlorite solution, and the third medicine barrel 53 contains polyaluminum chloride and polyacrylamide (flocculant).

[0045] Each reagent barrel 5 is provided with a lifting pump 54 for pumping the liquid medicine into the overflow tank 2. The reagent in the first reagent barrel 51 is pumped into the primary overflow tank 21 through the lifting pump 54 to decompose the oil substances in the sewage, the reagent in the second reagent barrel 52 is pumped into the secondary overflow tank 22 through the lifting pump 54 to decompose the ammonia nitrogen, and the reagent in the third reagent barrel 53 is pumped into the tertiary overflow tank 23 through the lifting pump 54 to condense the impurities in the sewage. The primary overflow tank 21, the secondary overflow tank 22 and the tertiary overflow tank 23 are all provided with a stirring device 25 for ensuring that the reagent and the sewage are fully mixed. The overflow tanks 2 of each level in this embodiment are interconnected, and the overflow ports at different positions on the partition are used to realize the step-by-step treatment and effective separation of the sewage.

[0046] Reference Figure 4 and Figure 5 A fourth overflow port 2411 is provided on the outer wall of the overflow tank 2 near the third partition plate 231, and the fourth overflow port 2411 is located at the lower part of the outer wall of the overflow tank 2. A drainage elbow 241 is provided on the outer wall of the overflow tank 2, and the drainage elbow 241 passes through the fourth overflow port 2411 in sequence to connect the overflow tank 2 with the sedimentation tank 3.

[0047] A sedimentation hopper 34 for settling flocculants is provided at the lower part of the sedimentation tank 3. The sedimentation tank 3 of this embodiment is a relatively large rectangular tank. The number of sedimentation hoppers 34 is preferably two and they are arranged in parallel at the lower part of the sedimentation tank 3. The number and arrangement of the sedimentation hoppers 34 can be adjusted according to the volume and shape of the sedimentation tank 3. A sewage pipe 35 for discharging precipitated materials is provided on the side wall of the sedimentation hopper 34, and the sewage pipe 35 is connected to the interior of the sedimentation hopper 34.

[0048] A guide plate 31 is provided in the sedimentation tank 3. The guide plate 31 is located below the drain elbow 241 to guide the floccules to settle to the sedimentation bucket 34. The guide plate 31 is provided with a plurality of honeycomb channels 311 for the floccules to pass through. The honeycomb channels 311 are evenly arranged and tilted downward from one side of the drain elbow 241 to the side away from the drain elbow 241. The guide plate 31 and the inner wall of the sedimentation bucket 34 can be fixed by hanging with a rope or other methods.

[0049] A water channel 32 is provided on the inner wall of the sedimentation tank 3 away from the drain elbow 241, and the water channel 32 is located above the guide plate 31. The water channel 32 in this embodiment is an L-shaped plate body, and the water channel 32 is vertically fixedly connected to the inner wall of the sedimentation tank 3 along the width direction of the sedimentation tank 3. A toothed baffle 33 for intercepting floating foam is provided on the side of the water channel 3 away from the fixed connection with the inner wall of the sedimentation tank 3, and the toothed baffle 33 and the inner wall of the sedimentation tank 3 are parallel to each other.

[0050] A water inlet 41 for interconnection is provided on the side wall of the clear water tank 4 and the side wall of the sedimentation tank 3. The water inlet 41 is interconnected with the water trough 32. When the upper clear liquid of the sedimentation tank 3 enters the water trough 32 after secondary filtration by the toothed baffle 33, the drainable water in the water trough 32 enters the clear water tank 4 through the water inlet 41 for unified collection and treatment.

[0051] In this embodiment, an operating platform 6 for operators to move around is arranged on the upper part of the sedimentation tank 3 , and a staircase 61 leading to the operating platform 6 from the ground is arranged between the sedimentation tank 3 and the reagent barrel 5 .

[0052] The implementation principle of a sewage recovery system in an embodiment of the present application is as follows: the sewage in the storage tank 1 enters the overflow tank 2 through a pipe, and different levels of overflow tanks 2 are formed in the overflow tank 2 by arranging different partitions, and the sewage is treated step by step. In each level of the overflow tank 2, different chemicals are added to remove harmful substances in the sewage, and these chemicals are pumped from the chemical barrel 5 into the corresponding overflow tank 2 through the lifting pump 54.

[0053] The NaOH and carbon powder in the first reagent barrel 51 are used to decompose the oil in the primary overflow tank 21; the sodium hypochlorite solution in the second reagent barrel 52 is used to nitrate ammonia nitrogen in the secondary overflow tank 22; the polyaluminium chloride and polyacrylamide (flocculant) in the third reagent barrel 53 are used to condense the impurities in the tertiary overflow tank 23. The stirring device 25 can fully mix the reagents with the sewage to improve the treatment effect. The treated sewage flows into the sedimentation tank 3 through the drainage elbow 241. In the sedimentation tank 3, the flocculants in the sewage settle in the sedimentation bucket 34 and are discharged through the sewage pipe 35. The guide plate 31 with the inclined honeycomb channel 311 can effectively settle the flocculants to the sedimentation bucket 34. The water trough 32 and the toothed baffle 33 on the upper part of the sedimentation tank 3 can intercept and remove the floating foam. After the secondary filtration of the toothed baffle 33, the dischargeable water that meets the discharge standard enters the clear water tank 4 through the water outlet 41 for further use or direct discharge.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sewage recovery system, characterized in that: The invention comprises a storage tank (1), an overflow tank (2), a sedimentation tank (3) and a clear water tank (4), wherein the storage tank (1) and the overflow tank (2) are interconnected, a reagent barrel (5) is arranged on the side of the overflow tank (2) away from the storage tank (1), the reagent barrel (5) and the overflow tank (2) are interconnected and a reagent is introduced into the overflow tank (2) to remove impurities in the sewage, the sedimentation tank (3) and the overflow tank (2) are interconnected to settle flocculants in the sewage, and the clear water tank (4) and the sedimentation tank (3) are interconnected to receive the dischargeable water.

2. A sewage recovery system according to claim 1, characterized in that: The medicine barrel (5) comprises a first medicine barrel (51), a second medicine barrel (52) and a third medicine barrel (53) for containing different medicines, and the first medicine barrel (51), the second medicine barrel (52) and the third medicine barrel (53) are each provided with a lifting pump (54) in a one-to-one correspondence; The overflow tank (2) comprises a primary overflow tank (21), a secondary overflow tank (22), a tertiary overflow tank (23) and a quaternary overflow tank (24) which are interconnected and arranged. The oil decomposer contained in the first reagent barrel (51) is introduced into the primary overflow tank (21) through the lifting pump (54), the nitrate decomposing agent in the second reagent barrel (52) is introduced into the secondary overflow tank (22) through the lifting pump (54), and the flocculant in the third reagent barrel (53) is introduced into the tertiary overflow tank (23) through the lifting pump (54).

3. A sewage recovery system according to claim 2, characterized in that: A first baffle (211) is provided between the primary overflow tank (21) and the secondary overflow tank (22), and a first overflow port (2111) is provided at the lower portion of the first baffle (211); A second baffle (221) is provided between the secondary overflow pool (22) and the tertiary overflow pool (23), and a second overflow port (2211) is provided on the upper portion of the second baffle (221); A third partition plate (231) is provided between the third-level overflow pool (23) and the fourth-level overflow pool (24), and a third overflow port (2311) is provided at the lower part of the third partition plate (231); The fourth overflow tank (24) is provided with a fourth overflow port (2411) on one side close to the sedimentation tank (3), and a drainage elbow (241) fixedly connected to the fourth overflow tank (24) is provided in the fourth overflow port (2411), and the sedimentation tank (3) and the fourth overflow tank (24) are connected to each other through the drainage elbow (241).

4. A sewage recovery system according to claim 2, characterized in that: The first-level overflow tank (21), the second-level overflow tank (22), and the third-level overflow tank (23) are all provided with a stirring device (25) for mixing medicines.

5. A sewage recovery system according to claim 3, characterized in that: A guide plate (31) for guiding flocculants to settle is arranged in the sedimentation tank (3), the guide plate (31) is located below the drainage elbow (241), and a plurality of honeycomb channels (311) for flocculants to pass through are opened on the guide plate (31), and each of the honeycomb channels (311) is arranged obliquely downward from one side of the drainage elbow (241) to a side away from the drainage elbow (241).

6. A sewage recovery system according to claim 1, characterized in that: The clean water tank (4) is fixedly connected to a side of the sedimentation tank (3) close to the medicine barrel (5), and a water outlet (41) communicating with the clean water tank (4) is provided on the side wall of the sedimentation tank (3).

7. A sewage recovery system according to claim 6, characterized in that: A water passage (32) is fixedly connected to the inner wall of the sedimentation tank (3) on the side away from the overflow tank (2), and the water passage (32) and the water outlet (41) are in communication with each other.

8. A sewage recovery system according to claim 7, characterized in that: A toothed baffle (33) for filtering floating foam is provided on one side of the water trough (32) close to the overflow pool (2).

9. A sewage recovery system according to claim 5, characterized in that: A sedimentation hopper (34) for settling flocculants is provided at the lower part of the sedimentation tank (3), and a sewage discharge pipe (35) is provided on the side of the sedimentation hopper (34) away from the reagent barrel (5), and the sewage discharge pipe (35) is communicated with the interior of the sedimentation hopper (34).

10. A sewage recovery system according to claim 1, characterized in that: The number of the storage tanks (1) is several so as to store sewage from different sources.

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