A storage tank for sewage treatment

Abstract

The present invention relates to the technical field of sewage treatment, and particularly relates to a regulating reservoir for sewage treatment, which has the function of fishing floating objects, always pumps the relatively clean sewage near the liquid surface, reduces the agitation and scouring of the sludge deposited at the bottom, has high water regulation efficiency and good usability; it includes a primary pool, an inlet pipe is installed on the primary pool, and regulating chamber one is communicated with regulating chamber two; it also includes a floating tank, a collection tank, a sludge pump one, a front baffle, a turning motor and a fishing rake. The floating tank floats on the sewage liquid surface in the secondary pool. The floating tank is provided with an overflow tank and a collection tank. The sludge pump one is installed on the floating tank, and the inlet pipe of the sludge pump one extends into the bottom of the overflow tank. Multiple overflow tank holes are arranged in the upper part of the front baffle, and the overflow tank holes extend below the sewage liquid surface. The turning motor is installed on the collection tank, the output shaft of the turning motor is connected with the fishing rake, and multiple rake teeth are arranged on one side of the fishing rake, and the multiple rake teeth respectively extend into the multiple overflow tank holes of the front baffle.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a storage tank for sewage treatment. Background Art

[0002] A storage tank is a sewage treatment device, generally an acceptance tank, which temporarily stores the peak flow of sewage in the storage tank and then slowly discharges the sewage from the storage tank after the maximum flow decreases. It can reduce the treatment pressure brought by the sewage peak period and play a positive role in the scheduling of sewage treatment.

[0003] In the prior art, a variety of storage tanks have been proposed. For example, a rainwater storage tank and drainage system proposed in a Chinese invention application with the publication number "CN115247452A". When the storage tank receives a large amount of sewage containing rainwater and exceeds the load inside the storage tank body, the sewage will flow through the entire length of the storage tank body and then flow out through the overflow holes. It has the function of an overflow tank, which is beneficial to the precipitation of suspended solids in the rainwater, improves the quality of the rainwater discharged into the river, and achieves the purpose of improving the water quality of the river. However, like traditional storage tanks, the outlet pipe of this storage tank is fixedly arranged and cannot automatically and flexibly adjust along with the sewage liquid level during drainage. It is easy to wash and drive up the sediment deposited at the bottom of the tank during drainage, and it does not have a salvage function, and the drain pipe is easily blocked by floating objects on the water surface. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a storage tank for sewage treatment that has the function of salvaging floating objects, always extracts the relatively clean sewage near the liquid surface, reduces the agitation and scouring of the sediment deposited at the bottom, has high water transfer efficiency, and good usability.

[0005] A storage tank for sewage treatment according to the present invention includes a primary tank, a water inlet pipe, and a secondary tank. A storage chamber one is provided inside the primary tank. The water inlet pipe is installed on the primary tank, and the water inlet pipe inputs sewage into the storage chamber of the primary tank. A storage chamber two is provided inside the secondary tank, and the storage chamber one is communicated with the storage chamber two. It further includes a floating tank, a collection tank, a sludge pump one, a front baffle, a turning motor, and a fishing rake. The floating tank floats on the sewage liquid surface in the secondary tank. The floating tank is provided with an overflow tank and a collection tank. A collection port is provided on the upper end surface of the collection tank. The sludge pump one is installed on the floating tank. The inlet pipe of the sludge pump one extends into the bottom of the overflow tank, and the outlet pipe of the sludge pump one extends outside the secondary tank. A plurality of overflow tank holes are provided in the upper part of the front baffle, and the overflow tank holes extend below the sewage liquid surface. The turning motor is installed on the collection tank, and the output shaft of the turning motor is connected to the fishing rake. A plurality of rake teeth are provided on one side of the fishing rake, and the plurality of rake teeth respectively extend into the plurality of overflow tank holes of the front baffle. The turning motor drives the fishing rake to drive the plurality of rake teeth to fish the floating objects intercepted by the front baffle into the collection tank. When working, sewage is input into the storage chamber one of the primary tank through the water inlet pipe. After the sewage is buffered and decelerated in the storage chamber one, it flows into the storage chamber two of the secondary tank. The sewage undergoes over-flow sedimentation in the storage chamber two. The relatively clean part at the sewage liquid surface flows into the overflow tank of the collection tank through the plurality of overflow tank holes of the front baffle, and the floating objects are intercepted outside the front baffle. The sludge pump one discharges the sewage in the overflow tank of the floating tank. After working for a period of time, the turning motor drives the fishing rake to rotate, and the fishing rake drives the plurality of rake teeth to turn, so that the plurality of rake teeth lift the floating objects intercepted by the front baffle and put them into the collection tank, thus having the function of fishing floating objects. Moreover, the floating tank rises and falls with the sewage liquid surface, can maintain stable water regulation when the sewage inflow is small, and always pumps the relatively clean sewage near the liquid surface, reducing the agitation, scouring and driving effect on the sediment at the bottom, with high water regulation efficiency and good usability.

[0006] Preferably, a mud inlet is provided on the front side of the overflow tank of the floating tank. The middle part of the front baffle is rotatably installed on the mud inlet of the overflow tank through a rotating shaft. An elastic member is provided between the rotating shaft of the front baffle and the side wall of the floating tank. The lower part of the front baffle movably blocks the mud inlet from the outside to the inside. When the floating tank follows the sewage liquid surface and drops to the bottom of the secondary tank, the turning motor drives the fishing rake to rotate, and the fishing rake drives the plurality of rake teeth to push the upper part of the front baffle inward, so that the lower part of the front baffle rotates outward, opening the mud inlet of the floating tank, enabling the sludge at the bottom of the secondary tank to enter the overflow tank of the floating tank, and the sludge pump one discharges the entered sludge, realizing the function of discharging sludge. After the sludge is discharged, the turning motor drives the fishing rake to reset, and the elastic member drives the front baffle to reset, so that the lower part of the front baffle blocks the mud inlet. Since the lower part of the front baffle movably blocks the mud inlet from the outside to the inside, it will be pressed tightly on the mud inlet under the water pressure of the sewage, ensuring the sealing performance during sewage overflow.

[0007] Preferably, the elastic member is a torsion spring. One end of the torsion spring is connected to the rotating shaft of the front apron, and the other end of the torsion spring is connected to the floating tank. The elastic force of the torsion spring acts on the rotating shaft of the front apron, thereby driving the front apron to flip and reset. The technology is mature, improving the practicability.

[0008] Preferably, it further includes a winch one, a cable one, and a pulley. The mud inlet of the floating tank faces the first-stage pond. The cable one is installed at one end of the second-stage pond close to the first-stage pond. The upper end of the cable one is wound in the winch one, and the lower end of the cable one is connected to the floating tank. The pulley is installed at the bottom of the second-stage pond, and the middle part of the cable one bypasses the pulley. When the floating tank follows the liquid level and drops to the bottom of the second-stage pond, after the front apron flips to open the mud inlet, the winch one winds the cable one. The cable one is guided by the pulley and pulls the floating tank to move towards the first-stage pond, so that the floating tank shovels the silt into the overflow tank, improving the silt discharge efficiency.

[0009] Preferably, it further includes a winch two and a cable two. The winch two is installed at one end of the second-stage pond far from the first-stage pond. The upper end of the cable two is wound in the winch two, and the lower end of the cable two is connected to the floating tank. After the floating tank clears the silt, the winch two winds the cable two to pull the floating tank back to the rear side of the second-stage pond for reset. At the same time, the winch one and the winch two cooperate to position the floating tank in the floating state.

[0010] Preferably, it further includes floating boxes. The number of floating boxes is set to be even, and the floating boxes are symmetrically arranged on both sides of the floating tank. By installing multiple floating boxes, the buoyancy of the floating tank is increased, enabling the floating tank to float stably.

[0011] Preferably, it further includes a partition one. The partition one is arranged on one side of the second-stage pond close to the first-stage pond. The partition one divides the storage chamber two of the second-stage pond into front and rear parts, and the front and rear parts communicate with each other above the partition one. The partition one blocks the newly incoming sewage. When the sewage submerges the partition one, it slowly flows into the rear part of the storage chamber two of the second-stage pond, reducing the impact of the newly incoming sewage on the already precipitated old sewage and preventing the silt in the rear part of the storage chamber two from being washed up, improving the practicability.

[0012] Preferably, it further includes a partition two. The partition two is installed in the storage chamber one of the first-stage pond. The partition two divides the storage chamber one into upper and lower parts. The output end of the water inlet pipe is located below the partition two, and the connection between the storage chamber one of the first-stage pond and the storage chamber two of the second-stage pond is located above the partition two. The partition two guides and separates the sewage entering the first-stage pond through the water inlet pipe, so that the heavy pollutants such as sediment in the sewage are guided to the bottom of the storage chamber one of the first-stage pond, realizing sewage buffering and preliminary treatment, with good practicability.

[0013] Preferably, it further includes a second sludge pump. The sludge suction pipes of the second sludge pump respectively extend into the bottom of the storage chamber 1 of the first-stage tank and the bottom of the front part of the storage chamber 2 of the second-stage tank. The sludge discharge pipe of the second sludge pump extends out of the first-stage tank. The second sludge pump discharges the silt deposited at the bottom of the storage chamber 1 of the first-stage tank and the front part of the storage chamber 2 of the second-stage tank, so as to clean the storage chamber 1 of the first-stage tank and the front part of the storage chamber 2 of the second-stage tank.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: When working, sewage is input into the storage chamber 1 of the first-stage tank through the water inlet pipe. After the sewage is buffered and decelerated in the storage chamber 1, it flows into the storage chamber 2 of the second-stage tank. The sewage undergoes overcurrent sedimentation in the storage chamber 2. The relatively clean part at the sewage liquid level flows into the overflow tank of the collection tank through the multiple overflow slots of the front enclosure board, and the floating objects are intercepted outside the front enclosure board. The first sludge pump discharges the sewage in the overflow tank of the floating tank. After working for a period of time, the flipping motor drives the dredging rake to rotate, and the dredging rake drives multiple rake teeth to flip, so that the multiple rake teeth pick up the floating objects intercepted by the front enclosure board and put them into the collection tank, thus having the function of salvaging floating objects. Moreover, the floating tank rises and falls with the sewage liquid level, can maintain stable water regulation when the sewage inflow is small, and always pumps the relatively clean sewage near the liquid level, reducing the agitation and scouring driving effect on the silt deposited at the bottom, with high water regulation efficiency and good usability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a schematic side-sectional structural diagram of the present invention;

[0017] Figure 3 is a schematic structural diagram of the present invention in the sludge dredging state;

[0018] Figure 4 is a schematic axonometric elevation structural diagram of the present invention in the sludge dredging state;

[0019] Figure 5 is a schematic structural diagram of the present invention in the state of salvaging floating objects;

[0020] Figure 6 is a schematic structural diagram of the first sludge pump;

[0021] Reference numerals in the drawings: 1, first-stage tank; 2, water inlet pipe; 3, second-stage tank; 4, floating tank; 5, collection tank; 6, first sludge pump; 7, front enclosure board; 8, flipping motor; 9, dredging rake; 10, first winch; 11, first cable; 12, pulley; 13, second winch; 14, second cable; 15, torsion spring; 16, floating box; 17, first partition board; 18, second partition board; 20, second sludge pump. DETAILED DESCRIPTION OF THE INVENTION

[0022] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0023] Embodiment 1

[0024] As shown in Figure 1 , Figure 2 and Figure 5 , a storage tank for sewage treatment includes a first-stage tank 1, a water inlet pipe 2, and a second-stage tank 3. A storage chamber one is arranged inside the first-stage tank 1. The water inlet pipe 2 is installed on the first-stage tank 1, and the water inlet pipe 2 inputs sewage into the storage chamber of the first-stage tank 1. A storage chamber two is arranged inside the second-stage tank 3, and the storage chamber one is communicated with the storage chamber two. It further includes a floating tank 4, a collection tank 5, a sludge pump one 6, a front baffle 7, a turning motor 8, and a fishing rake 9. The floating tank 4 floats on the sewage liquid surface in the second-stage tank 3. The floating tank 4 is provided with an overflow tank and a collection tank 5. The upper end surface of the collection tank 5 is provided with a collection port. The sludge pump one 6 is installed on the floating tank 4. The inlet pipe of the sludge pump one 6 extends into the bottom of the overflow tank. The outlet pipe of the sludge pump one 6 extends outside the second-stage tank 3. A plurality of overflow tank holes are arranged in the upper part of the front baffle 7, and the overflow tank holes extend below the sewage liquid surface. The turning motor 8 is installed on the collection tank 5. The output shaft of the turning motor 8 is connected to the fishing rake 9. One side of the fishing rake 9 is provided with a plurality of rake teeth, and the plurality of rake teeth respectively extend into the plurality of overflow tank holes of the front baffle 7. The turning motor 8 drives the fishing rake 9 to drive the plurality of rake teeth to fish the floating objects intercepted by the front baffle 7 into the collection tank 5.

[0025] During operation, sewage is input into the storage chamber one of the first-stage tank 1 through the water inlet pipe 2. After the sewage is buffered and decelerated in the storage chamber one, it flows into the storage chamber two of the second-stage tank 3. The sewage undergoes overcurrent precipitation in the storage chamber two. The relatively clean part at the sewage liquid surface flows into the overflow tank of the collection tank 5 through the plurality of overflow tank holes of the front baffle 7, and the floating objects are intercepted outside the front baffle 7. The sludge pump one 6 discharges the sewage in the overflow tank of the floating tank 4. After working for a period of time, the turning motor 8 drives the fishing rake 9 to rotate, and the fishing rake 9 drives the plurality of rake teeth to turn, so that the plurality of rake teeth pick up the floating objects intercepted by the front baffle 7 and put them into the collection tank 5, thus having the function of fishing floating objects. Moreover, the floating tank 4 rises and falls with the sewage liquid surface, can maintain stable water regulation when the sewage inflow is small, and always pumps the relatively clean sewage near the liquid surface, reducing the agitation and scouring driving effect on the sediment at the bottom, with high water regulation efficiency and good usability.

[0026] Embodiment 2

[0027] As shown in Figure 3 , Figure 4 and Figure 6As shown, on the basis of Embodiment 1, a mud inlet is provided on the front side of the overflow tank of the floating tank 4. The middle part of the front baffle 7 is rotatably installed on the mud inlet of the overflow tank through a rotating shaft. An elastic member is provided between the rotating shaft of the front baffle 7 and the side wall of the floating tank 4. The lower part of the front baffle 7 movably blocks the mud inlet from outside to inside; the elastic member is a torsion spring 15. One end of the torsion spring 15 is connected to the rotating shaft of the front baffle 7, and the other end of the torsion spring 15 is connected to the floating tank 4; further included are a winch one 10, a cable one 11 and a pulley 12. The mud inlet of the floating tank 4 faces the primary tank 1. The cable one 11 is installed at one end of the secondary tank 3 close to the primary tank 1. The upper end of the cable one 11 is wound in the winch one 10, and the lower end of the cable one 11 is connected to the floating tank 4. The pulley 12 is installed at the bottom of the secondary tank 3, and the middle part of the cable one 11 bypasses the pulley 12; further included are a winch two 13 and a cable two 14. The winch two 13 is installed at one end of the secondary tank 3 far from the primary tank 1. The upper end of the cable two 14 is wound in the winch two 13, and the lower end of the cable two 14 is connected to the floating tank 4; further included are floating boxes 16. The floating boxes 16 are provided in an even number and are symmetrically arranged on both sides of the floating tank 4.

[0028] When the floating tank 4 drops to the bottom of the secondary tank 3 following the sewage liquid level, the turning motor 8 drives the fishing rake 9 to turn. The fishing rake 9 drives multiple rake teeth to push the upper part of the front baffle 7 inward, so that the lower part of the front baffle 7 turns outward, opening the mud inlet of the floating tank 4, enabling the silt at the bottom of the secondary tank 3 to enter the overflow tank of the floating tank 4. The winch one 10 winds the cable one 11. After being guided by the pulley 12, the cable one 11 pulls the floating tank 4 to move towards the primary tank 1, enabling the floating tank 4 to shovel the silt into the overflow tank. The sludge pump one 6 discharges the entered silt, realizing the function of discharging silt. After the silt is discharged, the turning motor 8 drives the fishing rake 9 to reset. The elastic force of the torsion spring 15 acts on the rotating shaft of the front baffle 7, thereby driving the front baffle 7 to turn and reset, so that the lower part of the front baffle 7 blocks the mud inlet. Since the lower part of the front baffle 7 movably blocks the mud inlet from outside to inside, it will be pressed tightly on the mud inlet under the water pressure of the sewage, ensuring the sealing performance during sewage overflow. The winch two 13 winds the cable two 14 to pull the floating tank 4 back to the rear side of the secondary tank 3 for reset. At the same time, the winch one 10 and the winch two 13 cooperate to position the floating tank 4 in a floating state. By installing multiple floating boxes 16, the buoyancy of the floating tank 4 is increased, enabling the floating tank 4 to float stably.

[0029] Embodiment 3

[0030] As Figure 1 and Figure 2As shown in the figure, on the basis of Embodiment 1, it further includes a first partition plate 17. The first partition plate 17 is arranged on the side of the secondary pool 3 close to the primary pool 1. The first partition plate 17 divides the storage chamber two of the secondary pool 3 into front and rear parts, and the front and rear parts communicate with each other above the first partition plate 17. It further includes a second partition plate 18. The second partition plate 18 is installed in the storage chamber one of the primary pool 1. The second partition plate 18 divides the storage chamber one into upper and lower parts. The output end of the water inlet pipe 2 is located below the second partition plate 18, and the connection between the storage chamber one of the primary pool 1 and the storage chamber two of the secondary pool 3 is located above the second partition plate 18. It further includes a second sludge pump 20. The sludge suction pipes of the second sludge pump 20 respectively extend into the bottom of the storage chamber one of the primary pool 1 and the bottom of the front part of the storage chamber two of the secondary pool 3, and the sludge discharge pipe of the second sludge pump 20 extends outside the primary pool 1.

[0031] The second partition plate 18 guides and separates the sewage entering the primary pool 1 through the water inlet pipe 2, so that heavy pollutants such as sediment in the sewage are guided to the bottom of the storage chamber of the primary pool 1, realizing sewage buffering and preliminary treatment. The first partition plate 17 blocks the newly incoming sewage. When the sewage submerges the first partition plate 17, it slowly flows into the rear part of the storage chamber two of the secondary pool 3, reducing the impact of the newly incoming sewage on the already precipitated old sewage and preventing the silt in the rear part of the storage chamber two from being washed up. The second sludge pump 20 discharges the silt precipitated at the bottom of the storage chamber one of the primary pool 1 and the front part of the storage chamber two of the secondary pool 3, realizing the cleaning of the storage chamber one of the primary pool 1 and the front part of the storage chamber two of the secondary pool 3.

[0032] As Figures 1 to 6As shown in the figure, for a storage tank for sewage treatment according to the present invention, during operation, first, sewage is input into the storage chamber one of the first - stage tank 1 through the inlet pipe 2. After being buffered and decelerated in the storage chamber one, the sewage flows into the storage chamber two of the second - stage tank 3. The sewage undergoes over - flow sedimentation in the storage chamber two. Then, the relatively clean part of the sewage at the liquid level flows into the overflow tank of the collection tank 5 through the multiple overflow slots and holes of the front baffle 7, and the floating objects are intercepted outside the front baffle 7. The sludge pump one 6 discharges the sewage in the overflow tank of the floating tank 4. After working for a period of time, the flipping motor 8 drives the salvage rake 9 to rotate, and the salvage rake 9 drives multiple rake teeth to flip, so that the multiple rake teeth pick up the floating objects intercepted by the front baffle 7 and put them into the collection tank 5, thus having the function of salvaging floating objects. Moreover, the floating tank 4 rises and falls with the sewage liquid level, and can maintain stable water regulation when the sewage inflow is small. Then, when the floating tank 4 follows the sewage liquid level and drops to the bottom of the second - stage tank 3, the flipping motor 8 drives the salvage rake 9 to rotate. The salvage rake 9 drives multiple rake teeth to push the upper part of the front baffle 7 inward, so that the lower part of the front baffle 7 rotates outward, opening the mud inlet of the floating tank 4. The winch one 10 winds up the cable one 11. After being guided by the pulley 12, the cable one 11 pulls the floating tank 4 towards the first - stage tank 1, so that the floating tank 4 shovels the sludge into the overflow tank, and the sludge pump one 6 discharges the incoming sludge. Finally, after the floating tank 4 clears the sludge, the winch two 13 winds up the cable two 14 to pull the floating tank 4 back to the rear side of the second - stage tank 3 for reset. At the same time, the winch one 10 and the winch two 13 cooperate to position the floating tank 4 in the floating state.

[0033] The main functions achieved by the present invention are as follows:

[0034] 1. Always extract the relatively clean sewage near the liquid level, reducing the agitation, scouring and driving effect on the sludge deposited at the bottom;

[0035] 2. Have the function of salvaging floating objects to avoid pipeline blockage;

[0036] 3. Have the ability of rake - suction dredging to clean the sludge at the bottom of the tank;

[0037] 4. Maintain stable drainage with high water - regulation efficiency in the case of low water inflow.

[0038] For a storage tank for sewage treatment according to the present invention, its installation method, connection method or setting method are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented. The first - stage tank 1, second - stage tank 3, sludge pump one 6, flipping motor 8, winch one 10, cable one 11, pulley 12, winch two 13, cable two 14, torsion spring 15, floating box 16, sludge pump two 20 of the storage tank for sewage treatment according to the present invention are purchased on the market. Technical personnel in this industry only need to install and operate according to the attached operation manuals, without the need for creative labor from technical personnel in this field.

[0039] All the technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which this invention pertains. The terms used in the description of this invention herein are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] The above are only the preferred embodiments of this invention. It should be noted that for those of ordinary skill in the technical field, without departing from the technical principle of this invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of this invention.

Claims

1. A storage tank for sewage treatment, comprising a first-stage tank (1), a water inlet pipe (2) and a second-stage tank (3). A first storage chamber is arranged inside the first-stage tank (1). The water inlet pipe (2) is installed on the first-stage tank (1), and the water inlet pipe (2) inputs sewage into the storage chamber of the first-stage tank (1). A second storage chamber is arranged inside the second-stage tank (3), and the first storage chamber is communicated with the second storage chamber; characterized in that, It further includes a floating tank (4), a collection tank (5), a sludge pump 1 (6), a front enclosure (7), a turning motor (8) and a salvage rake (9). The floating tank (4) floats on the sewage liquid surface in the secondary tank (3). The floating tank (4) is provided with an overflow tank and a collection tank (5). The upper end surface of the collection tank (5) is provided with a collection port. The sludge pump 1 (6) is installed on the floating tank (4). The inlet pipe of the sludge pump 1 (6) extends into the bottom of the overflow tank. The outlet pipe of the sludge pump 1 (6) extends out of the secondary tank (3). Multiple overflow tank holes are provided in the upper part of the front enclosure (7), and the overflow tank holes extend below the sewage liquid surface. The turning motor (8) is installed on the collection tank (5). The output shaft of the turning motor (8) is connected to the salvage rake (9). Multiple rake teeth are provided on one side of the salvage rake (9), and the multiple rake teeth respectively extend into the multiple overflow tank holes of the front enclosure (7). The turning motor (8) drives the salvage rake (9) to drive the multiple rake teeth to salvage the floating objects intercepted by the front enclosure (7) into the collection tank (5); An inlet for sludge is provided on the front side of the overflow tank of the floating tank (4). The middle part of the front enclosure (7) is rotatably installed on the inlet for sludge of the overflow tank through a rotating shaft. An elastic member is provided between the rotating shaft of the front enclosure (7) and the side wall of the floating tank (4). The lower part of the front enclosure (7) movably blocks the inlet for sludge from outside to inside.

2. The storage tank for sewage treatment according to claim 1, wherein, The elastic member is a torsion spring (15). One end of the torsion spring (15) is connected to the rotating shaft of the front enclosure (7), and the other end of the torsion spring (15) is connected to the floating tank (4).

3. The storage tank for sewage treatment according to claim 1, wherein, It further includes a winch 1 (10), a cable 1 (11) and a pulley (12). The inlet for sludge of the floating tank (4) faces the primary tank (1). The cable 1 (11) is installed at one end of the secondary tank (3) close to the primary tank (1). The upper end of the cable 1 (11) is wound in the winch 1 (10). The lower end of the cable 1 (11) is connected to the floating tank (4). The pulley (12) is installed at the bottom of the secondary tank (3), and the middle part of the cable 1 (11) bypasses the pulley (12).

4. The storage tank for sewage treatment according to claim 1, characterized in that, It further includes a winch 2 (13) and a cable 2 (14). The winch 2 (13) is installed at one end of the secondary tank (3) far from the primary tank (1). The upper end of the cable 2 (14) is wound in the winch 2 (13). The lower end of the cable 2 (14) is connected to the floating tank (4).

5. The storage tank for sewage treatment according to claim 1, characterized in that, It further includes floating boxes (16). The number of floating boxes (16) is set to be even. The floating boxes (16) are symmetrically arranged on both sides of the floating tank (4).

6. The storage tank for sewage treatment according to claim 1, characterized in that, It further includes a partition 1 (17). The partition 1 (17) is arranged on one side of the secondary tank (3) close to the primary tank (1). The partition 1 (17) divides the storage chamber 2 of the secondary tank (3) into front and rear parts, and the front and rear parts communicate with each other above the partition 1 (17).

7. The storage tank for sewage treatment according to claim 1, wherein It further includes a partition 2 (18). The partition 2 (18) is installed in the storage chamber 1 of the primary tank (1). The partition 2 (18) divides the storage chamber 1 into upper and lower parts. The output end of the water inlet pipe (2) is located below the partition 2 (18), and the communication part between the storage chamber 1 of the primary tank (1) and the storage chamber 2 of the secondary tank (3) is located above the partition 2 (18).

8. A storage tank for sewage treatment according to claim 1, characterized in that, It further includes a second sludge pump (20). The sludge suction pipes of the second sludge pump (20) respectively extend into the bottom of the first storage chamber of the first-stage pond (1) and the bottom of the front part of the second storage chamber of the second-stage pond (3). The sludge discharge pipe of the second sludge pump (20) extends outside the first-stage pond (1).

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