Spraying device and system of secondary sedimentation tank

Abstract

The utility model discloses a spraying device and system of a secondary sedimentation tank. The spraying device comprises a spraying pipe and a water pump communicated with the spraying pipe, the spraying pipe is positioned above the secondary sedimentation tank and is fixed with a rotating bridge of the secondary sedimentation tank; a plurality of spraying holes are formed in the bottom of the spraying pipe, the spraying holes are distributed in two rows which are symmetrical in the axis direction of the spraying pipe, and the spraying holes in the two rows are alternately formed; the spraying pipe is annular, and the water pump extends into the clarification area of the secondary sedimentation tank. According to the spraying device for the secondary sedimentation tank, float sludge in the secondary sedimentation tank can be wetted, and sedimentation of the float sludge is accelerated. Meanwhile, clear liquid is extracted from the upper part of the secondary sedimentation tank for spraying water, and the spraying operation cost is reduced through sewage recycling.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, concretely relates to a kind of spray device and system of secondary sedimentation tank. BACKGROUND

[0002] Currently, the secondary sedimentation tank has become an indispensable component in the activated sludge system, and its role in the entire activated sludge system mainly includes sludge separation, mixed liquor clarification, thickening and return activated sludge, etc. As an important link of the activated sludge system, the working effect of the secondary sedimentation tank is directly related to the effluent quality and return sludge concentration of the activated sludge system.

[0003] In the actual treatment process, the aerobic tank as the previous process of the secondary sedimentation tank is in a low-load and carbon-source-deficient operating state, which leads to the disintegration of part of the sludge. The disintegrated sludge will float on the surface of the secondary sedimentation tank, resulting in poor sensory effect of the surface of the secondary sedimentation tank. The method of manual cleaning not only consumes time and effort, but also has poor effect.

[0004] The main function of the secondary sedimentation tank is to remove suspended sludge through gravity settling. However, for some suspended sludge, its characteristics make it difficult to settle completely, resulting in low removal efficiency. The suspended sludge rises to become floating sludge and cannot be effectively removed, the quality of the clarified liquid decreases, and the treatment requirements cannot be met, which will affect the subsequent treatment process. For the generated floating sludge and scum, the traditional main method is to remove the sludge and scum by adding chemicals. However, this method has some disadvantages: using specific chemicals to remove sludge and scum has high cost, increasing the economic burden. Some chemicals used for wastewater treatment can have negative effects on the environment, including pollution of aquatic life and soil. Ensuring the correct addition of chemicals, monitoring of concentration, and rationality of operation requires complex equipment and systems, increasing the difficulty of operation and maintenance. In addition, some chemical addition methods can cause chemical residues to be suspended in water, which requires additional steps to handle these residues to prevent adverse effects on the environment and water quality. Some chemicals have limited applicability to different water qualities, requiring customized treatment solutions, increasing the complexity of the project.

[0005] For example, patent CN205007651U discloses a new type of secondary sedimentation tank, which comprises a tank body, a rotating shaft is arranged in the center of the tank body, a rotating power system is arranged at the bottom of the rotating shaft, a sludge scraper is installed at the lower part of the rotating shaft and located above the bottom of the tank body, a mud scraping arm is arranged at the top of the rotating shaft, a sewage inlet pipe is arranged on one side of the tank body, an output pipe is arranged inside the overflow weir, the output pipe is connected to a scum filter tank, a filter screen is arranged in the scum filter tank, and a water outlet is arranged below the filter screen; a phosphate online measuring instrument is further arranged in the tank body; a chemical addition pipeline is arranged in the tank body, and a chemical flowmeter, a chemical addition pump and a chemical storage tank are sequentially connected to the chemical addition pipeline. By increasing the scum removal device, the influence on water purification is reduced.

[0006] Therefore, how to provide a low-cost, drug-free, and simple-to-operate sludge settling device is a problem to be solved by those skilled in the art. Practical new type content

[0007] In view of the defects in the prior art, the utility model provides a spray device and system of secondary sedimentation tank, the spray device includes spray pipe and water pump which communicates with spray pipe, spray pipe encloses plane, is located above secondary sedimentation tank, and is fixed with rotating bridge of secondary sedimentation tank, the bottom of spray pipe is equipped with multiple spray holes, spray hole distributes on two rows along spray pipe section symmetry, and spray hole on two rows is alternately arranged, and spray pipe section is the plane that the normal line of its pipe inner axis and the plane that spray pipe encloses forms, spray pipe is annular, and water pump extends into the clarification zone of secondary sedimentation tank, the spray device of secondary sedimentation tank given in the utility model can wet the floating sludge in secondary sedimentation tank, and accelerate its precipitation, simultaneously, the water of spray is extracted from the supernatant of the upper part of secondary sedimentation tank, reduces the spray operation cost through sewage recycling.

[0008] In a first aspect, the utility model provides a spray device of secondary sedimentation tank, include: spray pipe and water pump which communicates with spray pipe,

[0009] Spray pipe encloses plane, is located above secondary sedimentation tank, and is fixed with rotating bridge of secondary sedimentation tank,

[0010] The bottom of spray pipe is equipped with multiple spray holes, and multiple spray holes are distributed on the first array and the second array respectively,

[0011] The first array and the second array are symmetrical along the spray pipe section, and the spray holes in the first array and / or the second array are uniformly distributed, wherein the spray pipe section is a plane formed by the normal line of the pipe inner axis of the spray pipe and the plane enclosed by the spray pipe,

[0012] The water pump extends into the clarification zone of the secondary sedimentation tank.

[0013] Further, the spray pipe is annular, and the spray holes in the first array and the second array are alternately arranged.

[0014] Further, the normal of the spray holes in the first array forms a first included angle with the normal line of the plane enclosed by the spray pipe, the normal of the spray holes in the second array forms a second included angle with the normal line of the plane enclosed by the spray pipe, and the first included angle and / or the second included angle is 30°-60°.

[0015] Further, the normal of the spray holes in the first array forms a first included angle with the normal line of the plane enclosed by the spray pipe, the normal of the spray holes in the second array forms a second included angle with the normal line of the plane enclosed by the spray pipe, and the first included angle and / or the second included angle is 120°-150°.

[0016] Furthermore, the interval between the spray holes in the first array and / or the second array is no more than 2h, where h is the vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank.

[0017] Furthermore, the orifice diameter of the spray hole is 2 to 5 mm, and the spray flow rate of a single spray hole is not less than 10 L / min.

[0018] Furthermore, the shape of the spray pipe along the spray pipe matches the shape of the overflow trough of the secondary sedimentation tank.

[0019] Furthermore, the vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank is not less than 0.5 mm, and the ratio of the plane area enclosed by the spray pipe to the surface area of ​​the secondary sedimentation tank is not less than 2 / 3.

[0020] Furthermore, the number of the spray pipes is at least one group, and the normal centers of the planes enclosed by the spray pipes in each group coincide.

[0021] In a second aspect, the present invention further provides a spray system for a secondary sedimentation tank, comprising:

[0022] Secondary sedimentation tank, which includes clarification area, sedimentation area, buffer area and sludge area, as well as water inlet structure, rotating bridge, overflow tank and water outlet structure;

[0023] Like the spraying device of the secondary sedimentation tank mentioned above, it is arranged in the secondary sedimentation tank.

[0024] The utility model provides a spraying device and system for a secondary sedimentation tank, which at least includes the following

[0025] Beneficial effects:

[0026] (1) The spraying device for the secondary sedimentation tank provided by the utility model wets the floating mud in the secondary sedimentation tank by setting a spraying pipe above the secondary sedimentation tank, thereby accelerating its sedimentation. At the same time, the water for spraying is the clear liquid extracted from the upper part of the secondary sedimentation tank by a water pump, and the wastewater is reused, which also reduces the operating cost of the spraying device.

[0027] (2) By limiting the vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank and the ratio of the plane area enclosed by the spray pipe to the surface area of ​​the secondary sedimentation tank, the spray pipe can act on the sewage in the secondary sedimentation tank with an appropriate spray range and height, thereby improving the spraying effect of the spray device and ultimately improving the sedimentation effect of the sludge.

[0028] (3) The setting of the first angle and the second angle allows the sprayed water flow to have a certain diffusion in the horizontal direction. On the basis of spraying on both sides of the spray pipe, the coverage area of ​​the spray can be increased, which helps to more evenly soak the floating mud at the bottom of the pool, thereby improving the spraying effect of the spray pipe in the utility model on the sewage in the secondary sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The plan view of the overall structure of the spray system of the secondary sedimentation tank is provided in the utility model;

[0030] Figure 2 The sectional view of the overall structure of the spray system of the secondary sedimentation tank is provided in the utility model;

[0031] Figure 3 The structure schematic diagram of the arrangement of the spray holes on the spray pipe is provided in the utility model;

[0032] Figure 4 The spray hole included angle schematic diagram is provided in the utility model.

[0033] Mark explanation: 1-spray pipe, 101-first array, 102-second array, 11-spray hole, 2-water pump, 3-secondary sedimentation tank, 301-clearing zone, 31-inlet structure, 32-overflow tank. DETAILED DESCRIPTION

[0034] In order to better understand the above technical solutions, the above technical solutions will be described in detail in combination with the drawings of the specification and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0035] The terms used in the embodiments of the utility model are only for the purpose of describing specific embodiments, and are not intended to limit the utility model. The singular form "a", "said" and "the" used in the embodiments of the utility model and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. "Multiple" generally includes at least two.

[0036] It should be noted that the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the goods or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include the elements inherent in such goods or devices. Without more limitation, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the goods or devices including the element.

[0037] As Figures 1-4 The utility model provides a kind of spray device of secondary sedimentation tank, it include: spray pipe 1 and the water pump 2 being communicated with spray pipe;

[0038] Spray pipe 1 is enclosed plane, located the upper of secondary sedimentation tank 3, and is fixed with the rotating bridge of secondary sedimentation tank 3;

[0039] The bottom of the spray pipe 2 is provided with a plurality of spray holes 11, and the plurality of spray holes 11 are respectively distributed in a first array 101 and a second array 102;

[0040] The first array 101 and the second array 102 are symmetrical along the cross section of the spray pipe. The spray holes 11 in the first array 101 and / or the second array 102 are evenly distributed. The cross section of the spray pipe is a surface formed by the inner axis of the pipe and the normal of the plane formed by the spray pipe 2.

[0041] The water pump 2 extends into the clarification zone 301 of the secondary sedimentation tank 3 .

[0042] The utility model provides a spraying device for a secondary sedimentation tank. The spraying pipe is provided to wet the floating mud in the secondary sedimentation tank by spraying sewage, thereby accelerating the sedimentation.

[0043] The water in the spray pipe is pumped through a water pump to extract the supernatant from the clarification area at the top of the secondary sedimentation tank, so that the sewage is reused, reducing the operating cost of the spray device.

[0044] Compared with the existing technology: when manual cleaning and sprinkling are used to remove floating mud, centralized treatment is required, which is labor-intensive, and when chemical addition is used, the cost of chemical reagents is increased. The spraying device for the secondary sedimentation tank provided by the utility model adopts a spraying and desludging method to circulate and spray the sewage in the secondary sedimentation tank, thereby soaking and removing the floating mud.

[0045] The spray device for the secondary sedimentation tank provided by the utility model is simple and practical in design, which not only reduces the operating cost but also avoids the defects of the traditional treatment method. In actual application, the device shows good effect.

[0046] The spray pipes are installed on the rotating bridge to achieve uniform spraying inside the secondary sedimentation tank, ensuring that the spray water can reach every corner of the secondary sedimentation tank, thereby effectively soaking the floating sludge and promoting its sedimentation. Improving the efficiency and uniformity of the spray helps to improve the treatment capacity and effect of the secondary sedimentation tank.

[0047] In order to ensure that the spray pipe has a better spraying effect on the secondary sedimentation tank, the structure of the spray pipe of the utility model has the following preferred solutions.

[0048] Specifically, such as Figure 3 As shown, the spray pipe 1 is annular, and the spray holes 11 in the first array 101 and the second array 102 are alternately arranged.

[0049] By alternately arranging the spray holes, the spray area of ​​the spray pipe can be increased, thereby improving the spray effect.

[0050] In addition, the interval between the spray holes 11 in the first array 101 and / or the second array 102 is no more than 2h, where h is the vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank.

[0051] The vertical distance between the spray pipe 1 and the sewage surface in the secondary sedimentation tank 2 is not less than 0.5 mm, and the ratio of the plane area enclosed by the spray pipe 1 to the surface area of ​​the secondary sedimentation tank 2 is not less than 2 / 3.

[0052] The spacing between adjacent spray holes in the first array and the second array is related to the height of the spray pipe. The density of the spray holes in the first array and the second array can ensure that the entire sewage surface of the secondary sedimentation tank is covered.

[0053] Generally speaking, the optimal spacing for spray holes is between 1 hour and 2 hours. The vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank should not be greater than 1 mm, and the ratio of the plane area enclosed by the spray pipe to the surface area of ​​the secondary sedimentation tank should not be greater than 1.

[0054] Limiting the range of the vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank, and the ratio of the plane area enclosed by the spray pipe to the surface area of ​​the secondary sedimentation tank, can ensure that the spray pipe acts on the sewage in the secondary sedimentation tank with a suitable spray range and height, thereby improving the spraying effect of the spray device and ultimately improving the sedimentation effect of the sludge.

[0055] In addition, the spray pipe can have a good spraying effect while preventing the spray pipe from acting on the overflow tank and affecting the water body in the overflow tank.

[0056] like Figure 1 As shown, the shape of the spray pipe 1 along the spray pipe 1 matches the shape of the overflow trough 32 of the secondary sedimentation tank 3.

[0057] The overflow trough 32 is arranged above the inner wall of the secondary sedimentation tank. By adjusting the rotation angle of the spray pipe so that the shape of the spray pipe in the top view matches the shape of the overflow trough, the spraying effect of the spray pipe on the sewage in the secondary sedimentation tank can be improved.

[0058] On the basis of ensuring the spraying effect as described above, the spraying effect of the spraying device can be further improved by arranging corresponding structures.

[0059] Furthermore, the number of the spray pipes 1 is at least one group, and can be set to multiple groups. The multiple groups of spray pipes 1 have the same shape, and the normal centers of the planes enclosed by the groups of spray pipes 1 coincide.

[0060] The normal centers of the planes enclosed by the groups of spray pipes coincide with each other, that is, the multiple groups of spray pipes form a concentric U-shape.

[0061] In addition, to improve the spraying effect of the spray pipe, multiple branches can be installed on the spray pipe, each branch being perpendicular to the axis of the spray pipe. The axis of the spray pipe is the axis of the pipe forming a ring, that is, the flow path of the sewage in the spray pipe coincides with the axis of the spray pipe, and is different from the center line of the spray pipe.

[0062] In order to ensure that the annular spray pipe has a suitable spraying area and spraying effect on the sewage surface in the secondary sedimentation tank, the arrangement and angle of the spray holes are optimally set in the utility model.

[0063] like Figure 4 As shown, the normal of the spray holes in the first array forms a first angle with the normal of the plane enclosed by the spray pipes, and the normal of the spray holes in the second array forms a second angle with the normal of the plane enclosed by the spray pipes. The first angle and / or the second angle is 30° to 60°.

[0064] Alternatively, the first angle and / or the second angle is 120° to 150°. In practical application scenarios, the alternately arranged spray holes can spray on both sides of the spray pipe on the basis of spraying in the normal direction of the spray pipe.

[0065] Preferably, the first angle and the second angle are 45° or 135°. The spray holes are arranged so that the normal to the plane formed by the spray pipe is at 45° or 135°, so that the sprayed water flow has a certain degree of horizontal diffusion. This can increase the spray coverage area on the basis of spraying on both sides of the spray pipe, help to more evenly wet the floating mud on the bottom of the tank, and improve the spray effect of the spray pipe on the sewage in the secondary sedimentation tank in the utility model.

[0066] Furthermore, in order to ensure that each spray hole has an appropriate spray area when the spray pipe is spraying, the diameter of the spray hole can be set to 2 to 5 mm.

[0067] During the spraying process through the annular spray pipe, when the water pump is used to recycle the upper clear liquid of the secondary sedimentation tank, the pumping power of the water pump can be adjusted so that a predetermined flow rate can be formed in the annular spray pipe after pumping, ultimately ensuring that the spraying effect of the annular spray pipe meets the predetermined requirements. Specifically, the spray flow rate of a single spray hole is not less than 10L / min. When the area of ​​the secondary sedimentation tank is large, resulting in a corresponding increase in the size of the spray pipe, it is also necessary to install multiple water pumps to ensure that the spraying effect of the annular spray pipe can meet the predetermined requirements.

[0068] In actual application scenarios, when multiple water pumps are set up, the multiple water pumps can be arranged symmetrically with equal intervals around the center line of the sprinkler pipe. This will improve the stability of the sprinkler pipe on the rotating bridge while ensuring the spraying effect of the sprinkler pipe, thereby increasing the service life of the sprinkler device.

[0069] Since the water pump needs to be immersed in the sewage in the secondary sedimentation tank, the spray pipe needs to be set above the secondary sedimentation tank. Therefore, the water pump and the spray pipe can be connected through a connecting pipe.

[0070] Furthermore, to ensure the connection between the water pump and the sprinkler pipe is secure and prevent the pump's own weight from causing damage to the connection pipe, a fixing structure can be installed between the sprinkler pipe and the water pump, for example, a fixing bracket can be used to secure the sprinkler pipe and the water pump. Floats can also be fixed to the bottom of the water pump or in areas not being pumped to increase the pump's levitation and reduce the impact of the pump's own weight on the connection pipe.

[0071] This utility model uses a spray pipe to spray the secondary sedimentation tank, solving the problem of sludge and other scum accumulating on the water surface during sewage treatment. The spray device effectively removes suspended sludge by spraying water onto the suspended sludge, flushing it to the bottom of the secondary sedimentation tank. This allows for full contact between the sludge and the liquid, promoting its settling and separation, thereby clarifying the liquid within the secondary sedimentation tank. By converting the sludge from a suspended state to a settled state, the spray device effectively reduces the amount of suspended sludge, lowers treatment costs, and improves water quality.

[0072] Compared to existing dosing methods, this utility model uses a spraying device to remove scum from the secondary sedimentation tank. This method offers the following advantages: The spraying device eliminates the need for expensive dosing of chemicals, resulting in lower costs. Compared to certain environmentally harmful chemicals, the spraying device is more environmentally friendly and does not introduce any extraneous chemicals. Furthermore, the spraying device is relatively simple to operate, eliminating complex dosing and monitoring procedures, thus reducing operational complexity.

[0073] In addition, the utility model also provides a spray system for a secondary sedimentation tank, including:

[0074] Secondary sedimentation tank 3, which includes a clarification zone 301, a sedimentation zone, a buffer zone and a sludge zone, and also includes an inlet structure 31, a rotating bridge, an overflow trough 32 and an outlet structure;

[0075] Like the spray device of the secondary sedimentation tank mentioned above, it is arranged in the secondary sedimentation tank 3.

[0076] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Clearly, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, to the extent such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to encompass such changes and modifications.

Claims

1. A spraying device for a secondary sedimentation tank, characterized in that: include: a spray pipe and a water pump connected to the spray pipe; The spray pipes are arranged in a plane, located above the secondary sedimentation tank, and fixed to the rotating bridge of the secondary sedimentation tank; The bottom of the spray pipe is provided with a plurality of spray holes, which are respectively distributed in the first array and the second array; the spray pipe is annular, and the spray holes in the first array and the second array are alternately arranged; The first array and the second array are symmetrical along the cross section of the spray pipe, and the spray holes in the first array and / or the second array are evenly distributed, wherein the cross section of the spray pipe is a surface formed by the inner axis of the pipe and the normal of the plane enclosed by the spray pipe; The water pump extends into the clarification area of ​​the secondary sedimentation tank.

2. The spraying device of the secondary sedimentation tank as claimed in claim 1, characterized in that: The normal of the spray holes in the first array forms a first angle with the normal of the plane formed by the spray pipes, and the normal of the spray holes in the second array forms a second angle with the normal of the plane formed by the spray pipes. The first angle and / or the second angle is 30° to 60°.

3. The spraying device of the secondary sedimentation tank as claimed in claim 1, characterized in that: The normal of the spray holes in the first array forms a first angle with the normal of the plane formed by the spray pipes, and the normal of the spray holes in the second array forms a second angle with the normal of the plane formed by the spray pipes. The first angle and / or the second angle is 120° to 150°.

4. The spraying device of the secondary sedimentation tank as claimed in claim 1, characterized in that: The interval between the spray holes in the first array and / or the second array is not greater than 2h, where h is the vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank.

5. The spraying device of the secondary sedimentation tank as claimed in claim 1, characterized in that: The orifice diameter of the spray hole is 2 to 5 mm, and the spray flow rate of a single spray hole is not less than 10 L / min.

6. The spraying device of the secondary sedimentation tank as claimed in claim 1, characterized in that: The shape of the spray pipe along the spray pipe matches the shape of the overflow trough of the secondary sedimentation tank.

7. The spraying device of the secondary sedimentation tank as claimed in claim 6, characterized in that: The vertical distance between the spray pipe and the sewage surface in the secondary sedimentation tank shall not be less than 0.5mm, and the ratio of the plane area enclosed by the spray pipe to the surface area of ​​the secondary sedimentation tank shall not be less than 2 / 3.

8. The spraying device of the secondary sedimentation tank according to claim 1, characterized in that: The number of the spray pipes is at least one group, and the normal centers of the planes enclosed by the spray pipes in each group coincide.

9. A spray system for a secondary sedimentation tank, characterized in that: include: Secondary sedimentation tank, which includes clarification area, sedimentation area, buffer area and sludge area, as well as water inlet structure, rotating bridge, overflow tank and water outlet structure; The spraying device of the secondary sedimentation tank as described in any one of claims 1 to 8 is arranged in the secondary sedimentation tank.

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