Vertical flow sedimentation tank

Abstract

A vertical flow sedimentation tank, comprising: a tank body; a water inlet center tube, arranged at the center of the upper end of the tank body, for muddy water to flow in vertically; a bell mouth, connected to the lower end of the water inlet center tube, and open downward; a reflection / separation integrated plate, in an umbrella-shaped structure, and an air guide pipe is arranged at the top of the umbrella-shaped structure, and muddy water flows downward from the outside of the umbrella-shaped structure after passing through the bell mouth; a gas-solid separator, arranged below the reflection / separation integrated plate, for receiving muddy water flowing out from the outside of the umbrella-shaped structure, and the gas-solid separator comprises a plurality of inclined plates, which extend obliquely downward from the inner wall of the tank body. The present invention further improves the sedimentation effect on the basis of ensuring the original sedimentation effect of the vertical flow sedimentation tank, especially has a good inhibitory effect on the denitrification floating sludge and anaerobic floating sludge that are easy to occur in the traditional vertical flow sedimentation tank.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a vertical flow sedimentation tank. Background Art

[0002] Sedimentation tank is a kind of structure that removes suspended solids from water by sedimentation. Sedimentation tank is widely used in wastewater treatment. There are many types of sedimentation tanks. According to the direction of water flow in the tank, it can be divided into three types: horizontal flow, vertical flow and radial flow.

[0003] Among them, the muddy water in the traditional vertical flow sedimentation tank is discharged from the center tube in the center of the sedimentation tank from top to bottom. The outlet of the center tube is equipped with an umbrella-shaped baffle to evenly distribute the muddy water in the tank, and then slowly rise along the entire section of the tank. The suspended matter settles into the conical sludge area at the bottom of the tank under the action of gravity, and the clarified water is discharged from the overflow weir around the upper end of the tank. Due to the advantages of convenient mud discharge, simple management and small footprint, this type of pool is widely used in the field of sewage treatment. However, this type of sedimentation tank has a large body depth, a conical bottom, and sludge attached to the mud bucket. It is easy to cause problems such as denitrification sludge and anaerobic sludge, which increases the difficulty of operation and management, poor effluent sedimentation effect, high requirements for the normal operation of subsequent equipment, and increased labor costs. Summary of the invention

[0004] The present invention aims to overcome the above defects of the prior art and provide a novel vertical flow sedimentation tank with a more reasonable structure and good sedimentation effect.

[0005] To achieve the above object, the present invention provides a vertical flow sedimentation tank, comprising:

[0006] Pool body;

[0007] The water inlet center tube is set at the center of the upper end of the pool body, allowing muddy water to flow in vertically;

[0008] The bell mouth is connected to the lower end of the water inlet center tube and is open downward;

[0009] The reflection / separation integrated plate is in an umbrella-shaped structure, and an air guide is provided at the top of the umbrella-shaped structure. The muddy water flows downward from the outside of the umbrella-shaped structure after passing through the bell mouth;

[0010] The gas-solid separator is arranged below the reflection / separation integrated plate and is used to receive the muddy water flowing out from the outside of the umbrella-shaped structure. The gas-solid separator includes a plurality of inclined plates extending obliquely downward from the inner wall of the pool body.

[0011] In a further embodiment, the inclination angle between the inclined surface in the umbrella-shaped structure of the reflection / separation integrated plate and the horizontal plane is between 15° and 25°.

[0012] In a further embodiment, at least part of the inclined plate of the gas-solid separator is provided with an opening at one end close to the upper wall of the cell body for conducting gas out.

[0013] In a further embodiment, the angle θ between the inclined plate of the gas-solid separator and the horizontal direction is between 55° and 60°.

[0014] In a further embodiment, the inclined plates are evenly distributed along the periphery of the pool body, and the length of the inclined plates is 0.5 m to 2.0 m.

[0015] In a further embodiment, it also includes: an air guide pipe, which is connected to the top of the umbrella-shaped structure and the opening on the inclined plate respectively, for guiding out the gas.

[0016] In a further embodiment, a reflow gap is provided between the gas-solid separator and the integrated reflection / separation plate, and the fluid flow rate of muddy water through the reflow gap is less than 2 m / h.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the vertical flow sedimentation tank is equipped with a reflection / separation integrated plate and a gas-solid separator, which is convenient for blocking the floating mud after anaerobic or denitrification in the conical mud storage area, and the collected gas is directly guided out of the tank through the air guide pipe. The structure is simple and reasonable, which effectively guarantees the sedimentation effect and reduces the difficulty of operation and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic cross-sectional view of an embodiment of the present invention.

[0019] Description of reference numerals:

[0020] 1 Water inlet center tube

[0021] 2 Bell mouth

[0022] 3 Reflection / separation integrated panel

[0023] 4 Conical mud storage area

[0024] 5 Mud discharge pipe

[0025] 6 Outlet weir

[0026] 7 Sump

[0027] 8 Water outlet

[0028] 9 Gas-solid separator

[0029] 10 Airway DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] With reference to the following drawings, the specific embodiments of the present invention are further described, so that the technicians who adopt the present invention can better understand and use the present sedimentation tank. Although the present invention can describe many details, these should not be interpreted as limiting the scope of the invention claimed or the invention that can be claimed, but as a description of the special features of a particular embodiment. Certain features described in this document in the context of a separate embodiment can also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment can also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, although the features can be described above as acting in certain combinations and even described in the initial scope of the claims, one or more features can be deleted from the claimed combination in some cases, and the claimed combination can be for a variation of a sub-combination or a sub-combination. Similarly, although the operations are described in a specific order in the drawings, this should not be understood as requiring such operations to be performed in the specific order shown or in a sequential order, or it should not be understood that all the operations shown are required to be performed to achieve the desired results.

[0032] According to the basic concept of the present invention, referring to Figure 1 As shown, a vertical flow sedimentation tank is provided, which includes: a tank body; a water inlet center tube 1, which is arranged at the upper center of the tank body, for muddy water to flow in vertically; a bell mouth 2, which is connected to the lower end of the water inlet center tube 1 and is open downward; the design parameters of the center tube 1 and the bell mouth 2 are consistent with those of a traditional sedimentation tank.

[0033] The reflection / separation integrated plate 3 is an umbrella-shaped structure. The muddy water flows downward from the outside of the umbrella-shaped structure after passing through the bell-shaped mouth 2, and a hole is opened at the top of the umbrella-shaped structure for extracting the gas; the gas-solid separator 9 is arranged below the reflection / separation integrated plate 3, and is used to receive the muddy water flowing out from the outside of the umbrella-shaped structure. The gas-solid separator 9 includes inclined plates around the pool wall, and the inclined plates extend obliquely downward from the inner wall of the pool body.

[0034] In some embodiments, the angle of inclination of the inclined surface in the umbrella-shaped structure of the reflective / separation integrated plate 3 to the horizontal plane is between 17° and 25°. This facilitates the separation of mud and water. Under the action of gravity, the sludge sinks into the sludge hopper along the reflective / separation integrated plate, and the clean water flows upward in a diverted manner. At the same time, the sludge with bubbles is blocked from floating up. The gas generated by the sludge in the sludge hopper is discharged through the air guide pipe at the top of the reflective / separation integrated plate.

[0035] In a further embodiment, the top of the inclined plate of the gas-solid separator 9 is provided with an opening for conducting gas out.

[0036] In some embodiments, the angle θ between the inclined plate of the gas-solid separator and the horizontal direction is between 55° and 60°. The advantage of setting this angle is that it blocks the sludge with bubbles from floating up and does not affect the sinking of the sludge.

[0037] In some embodiments, the inclined plates are evenly distributed along the periphery of the tank body. For example, the tank body is a hollow cylinder structure, and the inclined plates can be evenly arranged on the circumference of the same height along the inner wall of the cylinder structure; preferably, the length of the inclined plate is 0.5m to 2.0m. Preferably, the length of the inclined plate of the gas-solid separator is 1.0m, and the horizontal distance from the reflector is 0.3m.

[0038] In some embodiments, the vertical flow sedimentation tank of the embodiment of the present invention may further include an air guide pipe 10.

[0039] The air guide pipe 10 is connected to the top of the umbrella structure and the opening on the inclined plate, and then extends to the upper part of the pool body to guide the gas from the upper part of the pool body. The bubbles collected in the reflection / separation integrated plate 3 and the gas-solid separator 9 are discharged from the pool body through the air guide pipe 10.

[0040] The reflection / separation integrated plate 3 and the gas-solid separator 9 block the floating mud produced by anaerobic or denitrification, and separate the floating mud from the tiny bubbles. At this time, the tiny bubbles are collected at the highest point, and the floating mud falls back under the action of gravity due to the loss of tiny bubbles.

[0041] In some embodiments, a reflow gap is provided between the gas-solid separator 9 and the reflection / separation integrated plate 3 , and the fluid flow rate of the reflow gap is less than 2 m / h.

[0042] In some embodiments, the vertical flow sedimentation tank of the embodiment of the present invention may also include: an outlet weir 6 and a water collecting trough 7, which are arranged on the upper edge of the tank body, wherein the water collecting trough 7 is arranged around the outlet weir 6 to receive water overflowing from the upper part of the outlet weir; a water outlet 8 is also arranged at the bottom of the water collecting trough 7 to discharge the water in the water collecting trough.

[0043] In some embodiments, the vertical flow sedimentation tank of the embodiment of the present invention may further include: a conical mud storage area 4, located at the bottom of the vertical flow sedimentation tank, for storing the sludge flowing out from the gas-solid separation; and a mud discharge pipe 5, arranged on the side of the conical mud storage area 4, for discharging the sludge. The mud and water are gradually separated in the sedimentation tank by gravity, and the sludge is deposited in the conical mud storage area 4, for example, the cone inclination angle can be 55°. Finally, the sludge is discharged from the tank body through the sedimentation tank mud discharge pipe 5.

[0044] As described above, the novel vertical flow sedimentation tank according to the embodiment of the present invention optimizes the reflector plate of the central tube, integrates reflection and gas-solid separation, and adds a gas-solid separator, thereby solving the technical problems of the traditional vertical flow sedimentation tank, such as the large depth of the tank body, the easy occurrence of denitrification sludge and anaerobic sludge, the poor sedimentation effect of the effluent, and the high requirements for the normal operation of the subsequent equipment.

[0045] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vertical flow sedimentation tank, comprising: Pool body; The water inlet center tube is set at the center of the upper end of the pool body, allowing muddy water to flow in vertically; The bell mouth is connected to the lower end of the water inlet center tube and is open downward; The reflection / separation integrated plate is in an umbrella-shaped structure, and an air guide is provided at the top of the umbrella-shaped structure. The muddy water flows downward from the outside of the umbrella-shaped structure after passing through the bell mouth; A gas-solid separator is arranged below the reflection / separation integrated plate, and is used to receive the muddy water flowing out from the outside of the umbrella-shaped structure. The gas-solid separator includes a plurality of inclined plates, which extend obliquely downward from the inner wall of the pool body, wherein the inclined plates are evenly distributed along the periphery of the pool body, and the length of the inclined plates is 0.5m to 2.0m. At least part of the inclined plates of the gas-solid separator are provided with an opening at one end close to the inner wall of the pool body, for guiding out the gas; There is a return flow gap between the gas-solid separator and the reflection / separation integrated plate, and the flow rate of muddy water through the return flow gap is less than 2m / h; It also includes an air guide pipe, which is connected to the top of the umbrella-shaped structure and the opening on the inclined plate respectively, and is used to guide gas out; The reflection / separation integrated plate is completely located in the horn mouth; The inclination angle between the inclined surface in the umbrella-shaped structure of the reflection / separation integrated plate and the horizontal plane is between 15° and 25°; The angle θ between the inclined plate of the gas-solid separator and the horizontal direction is between 55° and 60°.

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