Combined sedimentation tank

Abstract

The utility model relates to the technical field of sewage treatment equipment, in particular to a combined sedimentation tank which comprises a tank body, a first perforated lattice wall, a lateral flow inclined plate, an underwater mud scraper, a mud collecting pit, a second perforated lattice wall and an effluent weir. The first perforated tracery wall and the second perforated tracery wall are arranged in the tank body in parallel and divide the tank body into a flocculation area, a sedimentation area and a water outlet area from front to back. The lateral inclined flow plate is arranged in the settling zone, and the lateral inclined flow plate is arranged on the front side of the settling zone; the underwater mud scraper is arranged at the bottom of the tank body; the sludge collecting pit is arranged at the bottom of the settling zone; and the water outlet weir is arranged in the water outlet area. According to the combined type sedimentation tank, raw water is subjected to dosing flocculation, is uniformly distributed to the lateral inclined flow plate of the sedimentation area through the first perforated lattice wall, is subjected to sedimentation through the lateral inclined flow plate, is subjected to advection sedimentation and is discharged through the water outlet area, and the combined type sedimentation tank gives full play to the combined advantages of an inclined plate sedimentation tank and an advection tank; the device has the advantages of good precipitation effect and high precipitation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, and particularly relates to a combined sedimentation tank. Background Art

[0002] The horizontal flow sedimentation tank is the most widely used tank type in large and medium-sized water plants in China at present, and has the advantages of simple structure, convenient management, strong impact load resistance, etc. Through reasonable dosing and flocculation, the effluent turbidity can be basically controlled within 1 - 3 NTU. The disadvantages of the horizontal flow sedimentation tank are long residence time, large floor area, and poor removal effect on some small and light alum flocs.

[0003] The inclined plate sedimentation tank or inclined tube sedimentation tank is an improved sedimentation tank that installs a group of parallel plates or sets a group of square pipes in the sedimentation area of the ordinary sedimentation tank to shorten the sedimentation time and improve the sedimentation efficiency. The inclined plate sedimentation tank or inclined tube sedimentation tank utilizes the laminar flow principle, improves the treatment capacity of the sedimentation tank, shortens the particle sedimentation distance, thereby shortening the sedimentation time, increases the sedimentation area of the sedimentation tank, and thus improves the treatment efficiency. However, the water flow flows upward and the sediment slides downward, resulting in poor sedimentation effect, and problems such as the need to stop operation regularly for manual flushing of the inner wall of the inclined tube to collect sediment, etc. Content of the Utility Model

[0004] The utility model aims at the technical problems of long sedimentation time in the existing horizontal flow sedimentation tank and poor sedimentation effect in the inclined plate sedimentation tank or inclined tube sedimentation tank, and provides a combined sedimentation tank.

[0005] The technical solution for the utility model to solve the above technical problems is as follows:

[0006] A combined sedimentation tank, comprising: a tank body, a first perforated flower wall, a side-flow inclined plate, an underwater sludge scraper, a sludge sump, a second perforated flower wall and an effluent weir;

[0007] The first perforated flower wall and the second perforated flower wall are arranged in parallel in the tank body, and the first perforated flower wall and the second perforated flower wall divide the tank body into a flocculation area, a sedimentation area and an effluent area from front to back.

[0008] The side-flow inclined plate is arranged in the sedimentation area, and the side-flow inclined plate is arranged at the front side of the sedimentation area; the underwater sludge scraper is arranged at the bottom of the tank body; the sludge sump is arranged at the bottom of the sedimentation area; the effluent weir is arranged in the effluent area.

[0009] Further: it further comprises: an automatic flushing device; the automatic flushing device is arranged outside the tank body, and the automatic flushing device is used for flushing the side-flow inclined plate.

[0010] Further: it also includes a rectifying plate; the rectifying plate is arranged in the water outlet area and on the front side of the water outlet weir.

[0011] Further: there are two sludge pits, one sludge pit is arranged at the front end of the sedimentation area, and the other sludge pit is arranged at the rear end of the sedimentation area.

[0012] Further: there is at least one group of inclined plates with lateral flow.

[0013] The combined sedimentation tank provided by the utility model has at least the following beneficial effects or advantages:

[0014] In the combined sedimentation tank provided by the utility model, the first perforated flower wall and the second perforated flower wall are arranged in parallel in the tank body, and the first perforated flower wall and the second perforated flower wall divide the tank body into a flocculation area, a sedimentation area and a water outlet area from front to back. The inclined plates with lateral flow are arranged in the sedimentation area and on the front side of the sedimentation area; the underwater sludge scraper is arranged at the bottom of the tank body; the sludge pit is arranged at the bottom of the sedimentation area; the water outlet weir is arranged in the water outlet area. In this combined sedimentation tank, after the raw water is flocculated with medicine, it is evenly distributed to the inclined plates with lateral flow in the sedimentation area through the first perforated flower wall, first undergoes sedimentation through the inclined plates with lateral flow and then through horizontal flow sedimentation and finally discharges water through the water outlet area. This combined sedimentation tank gives full play to the combined advantages of the inclined plate sedimentation tank and the horizontal flow tank type, and has the advantages of good sedimentation effect and high sedimentation efficiency. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of the combined sedimentation tank provided by the embodiment of the utility model;

[0016] Figure 2 It is another structural schematic diagram of the combined sedimentation tank provided by the embodiment of the utility model.

[0017] In the drawings, the list of components represented by each reference numeral is as follows:

[0018] 1 - First perforated flower wall, 2 - Inclined plates with lateral flow, 3 - Automatic flushing device, 4 - Underwater sludge scraper, 5 - Sludge pit, 6 - Second perforated flower wall, 7 - Rectifying plate, 8 - Water outlet weir, 10 - Tank body, 11 - Flocculation area, 12 - Sedimentation area, 13 - Water outlet area. Detailed Embodiments

[0019] Aiming at the technical problems of long sedimentation time in the existing horizontal flow sedimentation tank and poor sedimentation effect in the inclined plate sedimentation tank or the inclined tube sedimentation tank in the prior art, the utility model provides a combined sedimentation tank.

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model embodiment provides a combined sedimentation tank, see Figure 1 and Figure 2 It mainly includes: a pool body 10, a first perforated flower wall 1, a lateral flow inclined plate 2, an underwater mud scraper 4, a mud collecting pit 5, a second perforated flower wall 6, a rectifying plate 7 and a water outlet weir 8.

[0022] The first perforated flower wall 1 and the second perforated flower wall 6 are arranged side by side in the pool body 10, and the first perforated flower wall 1 and the second perforated flower wall 6 divide the pool body 10 from front to back into a flocculation area 11, a sedimentation area 12 and a water outlet area 13; the perforated flower wall (including the first perforated flower wall 1 and the second perforated flower wall 6) is a wall structure with holes, and its specific structure is the existing technology and will not be elaborated here.

[0023] The lateral flow inclined plate 2 adopts the inclined plate or co-pipe structure in the inclined plate sedimentation tank or the co-pipe sedimentation tank. The lateral flow inclined plate 2 is arranged in the sedimentation area 12, and the lateral flow inclined plate 2 is arranged at the front side of the sedimentation area 12. The rear side of the sedimentation area 12 is used for horizontal flow sedimentation; at least one group of lateral flow inclined plates 2 is arranged. The underwater scraper 4 is arranged at the bottom of the tank body 10. The specific structure of the underwater scraper 4 is the existing technology and will not be described in detail here.

[0024] The mud collecting pit 5 is arranged at the bottom of the sedimentation area 12; in this embodiment, two mud collecting pits 5 are arranged, one mud collecting pit 5 is arranged at the front end of the sedimentation area 12, and the other mud collecting pit 5 is arranged at the rear end of the sedimentation area 12. The mud collecting pit 5 is equipped with a sludge extraction device for extracting the sludge in the mud collecting pit 5.

[0025] The water outlet weir 8 is arranged in the water outlet area 13. The water outlet weir 8 is a container for temporarily storing treated water. The water outlet weir 8 can be connected to an external water supply official website to transport the treated water to a designated location. The rectifying plate 7 is arranged in the water outlet area 13, and the rectifying plate 7 is arranged in front of the water outlet weir 8; the rectifying plate 7 is arranged as a plate-like structure with multiple through holes evenly opened. The rectifying plate 7 is used to balance the amount of water entering the water outlet weir 8, so that the water can enter the water outlet weir 8 evenly and stably.

[0026] To prevent a large amount of sludge from depositing on the side-flow inclined plate 2 after working for a period of time and affecting the purification effect, a preferred embodiment of the present utility model further provides an automatic flushing device 3. The automatic flushing device 3 is arranged outside the pool body 10, and the automatic flushing device 3 is used to flush the side-flow inclined plate 2. The automatic flushing device 3 can adopt a high-pressure water pump and a nozzle, and the side-flow inclined plate 2 is flushed by the high-pressure water ejected from the nozzle.

[0027] See Figure 1 and Figure 2 , the working process of the combined sedimentation tank provided by the embodiment of the present utility model is as follows: after the raw water is dosed, it first enters the flocculation tank, and various flocculation methods such as baffle flocculation, folded plate flocculation, and grid flocculation can be selected for flocculation. After flocculation, the water is evenly distributed through the water distribution perforated wall and enters the sedimentation area 12. It first flows into the side-flow inclined plate 2, and most of the sludge is removed by sedimentation, and then flows into the horizontal flow sedimentation section to further remove the remaining sludge in the water and the sludge generated by flushing the inclined plate. The sedimented water flows through the second water distribution perforated wall and the flow straightening plate 7 and enters the water outlet weir 8, and flows into the collecting trough through the water outlet weir 8.

[0028] The effective water depth of the sedimentation tank is 3.3 m, the particle sedimentation velocity of the side-flow inclined plate 2 is 0.165 mm / s, the horizontal flow velocity is 11.6 mm / s, the particle sedimentation time is 8.59 min, the side-flow inclined plate 2 accounts for about 1 / 2 of the total length, mechanical sludge discharge is adopted for sludge discharge, and the total residence time is 40 min.

[0029] See Figure 1 and Figure 2 , the combined sedimentation tank provided by the embodiment of the present utility model has at least the following beneficial effects or advantages:

[0030] In the combined sedimentation tank provided by the embodiment of the present utility model, the first perforated water wall 1 and the second perforated water wall 6 are arranged in parallel in the pool body 10. The first perforated water wall 1 and the second perforated water wall 6 divide the pool body 10 into a flocculation area 11, a sedimentation area 12 and an outlet area 13 from front to back. The side-flow inclined plate 2 is arranged in the sedimentation area 12, and the side-flow inclined plate 2 is arranged on the front side of the sedimentation area 12; the underwater sludge scraper 4 is arranged at the bottom of the pool body 10; the sludge sump 5 is arranged at the bottom of the sedimentation area 12; the water outlet weir 8 is arranged in the outlet area 13. In this combined sedimentation tank, after the raw water is dosed and flocculated, it is transported to the flocculation tank, and is evenly distributed to the side-flow inclined plate 2 in the sedimentation area 12 through the first perforated water wall 1, and then flows out through the outlet area 13 after sedimentation in the side-flow inclined plate 2 and horizontal flow sedimentation. This combined sedimentation tank gives full play to the combined advantages of the inclined plate sedimentation tank and the horizontal flow tank type, and has the advantages of good sedimentation effect and high sedimentation efficiency.

[0031] In the description of the present utility model, it should be noted that for the term nouns in each embodiment, such as the words indicating directions like "upper", "lower", "front", "rear", "left", "right", etc., they are only used to simplify the description of the positional relationship based on the drawings in the specification, and do not represent that the elements and devices referred to must operate according to the specific directions, limited operations, methods, and structures in the specification. Such direction nouns do not constitute a limitation to the present utility model.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "joined" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific circumstances.

[0033] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A combined sedimentation tank, characterized in that: include: Pool body, first perforated flower wall, lateral flow inclined plate, underwater scraper, mud collection pit, second perforated flower wall and water outlet weir; The first perforated flower wall and the second perforated flower wall are arranged in parallel in the tank body, and the first perforated flower wall and the second perforated flower wall divide the tank body into a flocculation area, a sedimentation area and a water outlet area from front to back; The lateral flow inclined plate is arranged in the sedimentation area, and the lateral flow inclined plate is arranged at the front side of the sedimentation area; the underwater scraper is arranged at the bottom of the pool body; the mud collecting pit is arranged at the bottom of the sedimentation area; and the water outlet weir is arranged in the water outlet area.

2. The combined sedimentation tank according to claim 1, characterized in that: Also includes: Automatic flushing device; the automatic flushing device is arranged outside the pool body, and the automatic flushing device is used to flush the lateral flow inclined plate.

3. The combined sedimentation tank according to claim 1, characterized in that: Also includes: Rectifier plate; the rectifying plate is arranged in the water outlet area, and the rectifying plate is arranged on the front side of the water outlet weir.

4. The combined sedimentation tank according to claim 1, characterized in that: The mud collecting pits are provided in two, one of which is provided at the front end of the sedimentation area, and the other is provided at the rear end of the sedimentation area.

5. The combined sedimentation tank according to claim 1, characterized in that: At least one group of lateral flow inclined plates is provided.

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