A scum baffle device based on three-phase separation and flow guidance

Abstract

A scum baffle device based on three-phase separation and diversion can separate and divert rising aerated sludge, settling sludge, and effluent, which helps to prevent scum from entering the collection tank and improves the effect of activated sludge interception in the sedimentation tank. The device is characterized by including a collection tank extending into the sedimentation tank along the upper inner side of the tank wall. A two-dimensional inclined baffle is provided at the angle where the left side wall of the collection tank intersects with the bottom of the tank. The lower end of the two-dimensional inclined baffle is connected to the inner side of the sedimentation tank wall. A V-shaped groove is formed between the upper part of the two-dimensional inclined baffle and the left side wall of the collection tank. A three-dimensional vertical baffle is provided above the V-shaped groove. The three-dimensional vertical baffle includes a vertical steel plate. The bottom left side of the vertical steel plate is a triangular protrusion formed by folding a single piece of steel plate, making the vertical cross-section of the three-dimensional vertical baffle resemble an upright elevation symbol. A triangular overflow weir is provided on the left side wall of the collection tank, and an outlet channel is formed between the vertical steel plate and the triangular overflow weir.

Description

Technical Field

[0001] This invention relates to the field of sedimentation tank technology, and in particular to a scum baffle device based on three-phase separation and flow guidance. Background Technology

[0002] Traditional sedimentation tanks use a vertical baffle plate inserted into the water at the effluent scum outlet, with a collection trough against the wall occupying part of the sedimentation tank area. Once sludge in the collection trough area floats to the surface due to anaerobic methanogenesis or anoxic nitrogen production, it will enter the baffle plate and overflow weir area, forming scum. This scum overflows into the collection trough with the effluent through the overflow weir, resulting in sludge loss and increased suspended solids in the effluent. Summary of the Invention

[0003] To address the deficiencies or shortcomings in existing technologies, this invention provides a scum baffle device based on three-phase separation and diversion. By combining a three-dimensional vertical baffle and a two-dimensional inclined baffle, it can separate and divert rising aerated sludge, settling sludge, and effluent, and block scum from the surface of the sedimentation tank so that the scum scraping device can remove the scum. This helps to prevent scum from entering the water collection tank and improves the effect of the sedimentation tank in retaining activated sludge.

[0004] The technical solution of the present invention is as follows:

[0005] A scum baffle device based on three-phase separation and diversion is characterized by comprising a water collection trough extending into the sedimentation tank from the upper inner side of the tank wall. A two-dimensional inclined baffle is provided at the intersection angle between the left side wall of the water collection trough and the bottom of the trough. The lower end of the two-dimensional inclined baffle is connected to the inner side of the sedimentation tank wall. A V-shaped groove is formed between the upper part of the two-dimensional inclined baffle and the left side wall of the water collection trough. A three-dimensional vertical baffle is provided above the V-shaped groove. The three-dimensional vertical baffle includes a vertical steel plate. The bottom left side of the vertical steel plate is a triangular protrusion formed by folding a single piece of steel plate, so that the vertical section of the three-dimensional vertical baffle is in the shape of an upright elevation symbol. A triangular overflow weir is provided on the left side wall of the water collection trough. A water outlet channel is formed between the vertical steel plate and the triangular overflow weir.

[0006] A submersible aeration pipe is installed on the pointed bottom of the V-shaped groove.

[0007] The apex of the intersection angle between the upper and lower inclined sides of the triangular protrusion is further away from the left side wall of the water collection tank than the top of the upper part of the two-dimensional inclined baffle.

[0008] An outlet trough embedded iron is provided in the upper middle part of the left side wall of the water collection trough, and the three-dimensional vertical baffle is connected to the outlet trough embedded iron through the outlet trough horizontal brace.

[0009] The bottom of the water collection trough is provided with pre-embedded bolts for the outlet trough that connect to the two-dimensional inclined baffle. The inner side of the sedimentation tank wall below the bottom of the water collection trough is provided with a wall embedded iron that connects to the lower bottom of the two-dimensional inclined baffle.

[0010] The gap between the lower sloping side of the triangular protrusion and the upper top of the two-dimensional inclined baffle is the inlet of the water outlet channel.

[0011] The lower surface of the two-dimensional inclined baffle is an inclined floating surface for the gaseous sludge at the bottom of the sedimentation tank, so that the gaseous sludge rises to the water surface of the sedimentation tank to form scum. The left side of the vertical steel plate of the three-dimensional baffle is a scum blocking surface.

[0012] The lower sloping side of the triangular protrusion serves as the sloping floating side for the aerated sludge at the bottom of the sedimentation tank, allowing the aerated sludge to rise to the surface of the sedimentation tank and form scum. The left side of the vertical steel plate of the three-dimensional baffle serves as the scum blocking surface. The upper sloping side of the triangular protrusion serves as the guiding side for the sinking sludge in the scum to slide down obliquely away from the effluent area.

[0013] The lower end of the three-dimensional vertical baffle is 0.3 to 0.8 m above the water surface, the upper end of the three-dimensional vertical baffle is 0.1 to 0.3 m above the water surface, and the right side of the vertical steel plate of the three-dimensional vertical baffle is 0.2 to 0.5 m from the left side wall of the water collection tank.

[0014] Due to the long retention time, the sludge deposited at the bottom of the sedimentation tank undergoes anaerobic or denitrification reactions, releasing biogas or nitrogen. These gases carry the deposited sludge to the surface, forming scum. The gas-containing sludge that floats up from below the collection trough slides obliquely upwards along the lower surface of the two-dimensional inclined baffle to the center of the lower triangular inclined surface of the three-dimensional vertical baffle, and then slides obliquely upwards along the lower triangular inclined surface of the three-dimensional vertical baffle to the surface of the sedimentation tank, forming scum. This part of the scum is retained on the surface of the sedimentation tank due to the obstruction of the vertical part of the three-dimensional vertical baffle, and is then removed by the scum scraper. Once the sludge in this part of the scum begins to sink, it will slide obliquely downwards along the upper triangular inclined surface of the three-dimensional vertical baffle to a place far away from the effluent area, and then sink to the bottom of the sedimentation tank far away from the collection trough, and will not enter the collection trough with the water flow.

[0015] The technical effects of this invention are as follows: This invention provides a scum baffle device based on three-phase separation and diversion. Through the combination of a three-dimensional vertical baffle, horizontal bracing, embedded iron in the effluent trough, two-dimensional inclined baffle, pre-embedded bolts in the trough wall, embedded iron in the pool wall, and submerged aeration pipe, the water flow can prevent scum from being carried into the three-dimensional vertical baffle and the triangular weir area, and from entering the collection trough, thereby reducing sludge loss and ensuring that the suspended solids in the effluent meet the standards. It can be used in structures such as rectangular sedimentation tanks and large radial flow sedimentation tanks to prevent scum from overflowing into the collection trough. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a scum baffle device based on three-phase separation and flow guidance, which implements the present invention.

[0017] The reference numerals in the attached drawings are listed below: 1-Three-dimensional vertical baffle (including a vertical steel plate, the bottom left side of which is a triangular protrusion formed by folding a whole steel plate, so that the vertical section of the three-dimensional vertical baffle is in the shape of an upright elevation symbol); 2-Two-dimensional inclined baffle; 3-Triangular overflow weir; 4-Water collection trough; 5-Sedimentation tank wall; 6-Submerged aeration pipe; 11-Outlet trough cross brace; 12-Outlet trough embedded iron; 21-Outlet trough pre-embedded bolt; 22-Pool wall embedded iron. Detailed Implementation

[0018] The following is in conjunction with the attached diagram ( Figure 1 The invention will be described in the following sections and examples.

[0019] Figure 1 This is a schematic diagram of a scum baffle device based on three-phase separation and flow guidance, implementing the present invention. (Reference) Figure 1 As shown, a scum baffle device based on three-phase separation and diversion includes a water collection trough 4 extending into the sedimentation tank along the upper inner side of the sedimentation tank wall 5. A two-dimensional inclined baffle 2 is provided at the intersection angle between the left side wall and the bottom of the water collection trough 4. The lower end of the two-dimensional inclined baffle 2 is connected to the inner side of the sedimentation tank wall 5. A V-shaped groove is formed between the upper part of the two-dimensional inclined baffle 2 and the left side wall of the water collection trough 4. A three-dimensional vertical baffle 1 is provided above the V-shaped groove. The three-dimensional vertical baffle 1 includes a vertical steel plate. The bottom left side of the vertical steel plate is a triangular protrusion formed by folding a whole steel plate, so that the vertical section of the three-dimensional vertical baffle 1 is in the shape of an upright elevation symbol. A triangular overflow weir 3 is provided on the left side wall of the water collection trough 4. A water outlet channel is formed between the vertical steel plate and the triangular overflow weir 3.

[0020] A submersible aeration pipe 6 is installed on the pointed bottom of the V-shaped groove. The apex of the intersection of the upper and lower inclined sides of the triangular protrusion is further away from the left side wall of the water collection tank 4 than the top of the two-dimensional inclined baffle 2. A water outlet trough embedded iron 12 is installed in the upper middle part of the left side wall of the water collection tank 4, and the three-dimensional vertical baffle 1 is connected to the water outlet trough embedded iron 12 through the water outlet trough cross brace 11.

[0021] The bottom of the water collection tank 4 is provided with pre-embedded bolts 21 for connecting the outlet channel of the two-dimensional inclined baffle 2. The inner side of the sedimentation tank wall 5 below the bottom of the water collection tank 4 is provided with embedded iron 22 connected to the lower bottom of the two-dimensional inclined baffle 2. The gap between the lower inclined side of the triangular protrusion and the upper top of the two-dimensional inclined baffle 2 is the inlet of the outlet channel. The lower surface of the two-dimensional inclined baffle 2 is an inclined floating surface for the aerated sludge at the bottom of the sedimentation tank, allowing the aerated sludge to rise to the surface of the sedimentation tank and form scum. The left side of the vertical steel plate of the three-dimensional baffle 1 is a scum-blocking surface. The lower sloping side of the triangular protrusion is the sloping floating side of the aerated sludge at the bottom of the sedimentation tank, so that the aerated sludge rises to the surface of the sedimentation tank to form scum. The left side of the vertical steel plate of the three-dimensional baffle 1 is the scum blocking surface. The upper sloping side of the triangular protrusion is the sliding guide side of the sludge sinking in the scum, so that the sludge sinks obliquely to slide away from the effluent area.

[0022] The lower end of the three-dimensional vertical baffle 1 is 0.3 to 0.8 m above the water surface, the upper end of the three-dimensional vertical baffle 1 is 0.1 to 0.3 m above the water surface, and the right side of the vertical steel plate of the three-dimensional vertical baffle 1 is 0.2 to 0.5 m away from the left side wall of the water collection tank 4. The sludge deposited at the bottom of the sedimentation tank undergoes anaerobic or denitrification reactions due to its long retention time, releasing biogas or nitrogen. These gases carry the deposited sludge to the surface, forming scum. The gas-containing sludge that floats up from below the collection tank 4 slides obliquely upwards along the lower surface of the two-dimensional inclined baffle 2 to the center of the triangular lower inclined surface of the three-dimensional vertical baffle 1, and then slides obliquely upwards along the triangular lower inclined surface of the three-dimensional vertical baffle 1 to the surface of the sedimentation tank, forming scum. This part of the scum is blocked by the vertical part of the three-dimensional vertical baffle 1 and remains on the surface of the sedimentation tank. It is then removed by the scum scraper. Once the sludge in this part of the scum begins to sink, it will slide obliquely downwards along the triangular upper inclined surface of the three-dimensional vertical baffle 1 to a place far away from the effluent area, and then sink to the bottom of the sedimentation tank far away from the collection tank 4. It will not enter the collection tank 4 with the water flow.

[0023] Compared with existing technologies, this invention has the following characteristics: 1) It adopts a three-phase separation scum baffle, which, compared with the traditional solid-liquid separation two-phase scum baffle, can more effectively prevent air-containing sludge and scum from entering the collection channel through the triangular overflow weir. 2) The effluent flows horizontally and then vertically upward between the new scum baffles. Fine suspended solids in the effluent can undergo secondary sedimentation in the V-shaped trough, resulting in low suspended solids in the effluent flowing out of the sedimentation tank. 3) The high-efficiency scum baffle device is equipped with a submerged aeration pipe, which can perform periodic aeration. This effectively scrubs algae and other attached substances on the V-shaped trough, the three-dimensional vertical baffle on the effluent side, and the triangular overflow weir on the inlet side. The scrubbing water can be discharged back to the front end of the system for further treatment.

[0024] like Figure 1As shown, a scum baffle device based on three-phase separation and diversion consists of a three-dimensional vertical baffle 1, a cross brace 11 for the effluent channel, an embedded iron 12 for the effluent channel, a two-dimensional inclined baffle 2, pre-embedded bolts 21 for the effluent channel, an embedded iron 22 for the pool wall, and a submerged aeration pipe 6. Together with a triangular overflow weir 3, a collection trough 4, and a sedimentation tank wall 5, it forms an effluent system. The embedded iron 12 for the effluent channel is located at the upper middle part of the outer wall of the collection trough 4. The cross brace 11 for the effluent channel connects the embedded iron 12 and the three-dimensional vertical baffle at both ends. 1; The pre-embedded bolt 21 of the outlet trough is located at the bottom of the outer wall of the collection trough 4; The embedded iron 22 of the pool wall is located on the inner side of the sedimentation tank wall 5 and below the collection trough 4; The two-dimensional inclined baffle 2 is connected to the collection trough 4 through the pre-embedded bolt 21 of the outlet trough; The two-dimensional inclined baffle 2 is connected to the sedimentation tank wall 5 through the embedded iron 22 of the pool wall; The submerged aeration pipe 6 is located in the angle between the two-dimensional inclined baffle 2 and the outer wall of the collection trough 4; The triangular overflow weir 3 is located at the upper end of the outer wall of the collection trough 4.

[0025] The three-dimensional vertical baffle 1 is folded from a single piece of steel plate, with a triangular lower end and a vertical cross-section resembling an upright elevation symbol.

[0026] The lower end of the three-dimensional vertical baffle 1 is 0.3 to 0.8 m from the water surface, 0.1 to 0.3 m above the water surface, and 0.2 to 0.5 m from the water collection trough.

[0027] The included angle of the upper interior angle of the triangle of the three-dimensional vertical baffle 1 is 30° to 45°, the included angle of the lower interior angle is 30° to 45°, and the included angle of the left interior angle is 90° to 120°.

[0028] The two-dimensional inclined baffle 2 is a single flat steel plate with an angle of 30° to 45° with the pool wall.

[0029] The upper end of the two-dimensional inclined baffle 2 is located on the vertical line of the center of the triangle of the three-dimensional upright baffle 1.

[0030] The vertical distance between the upper end of the two-dimensional inclined baffle 2 and the lower end of the three-dimensional vertical baffle 1 meets the requirement that the horizontal flow velocity of the water flow is ≤20mm / s.

[0031] The submersible aeration pipe 6 does not float in the aeration state, and the top of the submersible aeration pipe 6 is evenly arranged with slit-shaped closed holes facing the water surface.

[0032] The sludge-blocking process of this invention is as follows: Sludge deposited at the bottom of the sedimentation tank undergoes anaerobic or denitrification reactions due to its long residence time, releasing biogas or nitrogen. These gases carry the deposited sludge to the surface, forming scum. The aerated sludge floating from below the collection trough slides obliquely upwards along the lower surface of the two-dimensional inclined baffle to the center of the triangular lower inclined surface of the three-dimensional vertical baffle, and then slides obliquely upwards along the triangular lower inclined surface of the three-dimensional vertical baffle to the surface of the sedimentation tank, forming scum. This part of the scum is retained on the surface of the sedimentation tank due to the obstruction of the vertical part of the three-dimensional vertical baffle, and is then removed by a scraper. If the sludge in this part of the scum sinks for some reason, it will slide obliquely downwards along the triangular upper inclined surface of the three-dimensional vertical baffle, away from the effluent area, and then sink to the bottom of the sedimentation tank away from the collection channel, without entering the collection trough with the water flow.

[0033] In this invention, a V-shaped groove is formed between the upper part of the two-dimensional inclined baffle and the water collection tank. The effluent first flows horizontally and then vertically upward between the novel scum baffles. Fine suspended solids in the effluent can undergo secondary sedimentation in the V-shaped groove, resulting in low suspended solids in the effluent flowing out of the sedimentation tank.

[0034] The scum baffle device based on three-phase separation and diversion of the present invention is equipped with a submerged aeration pipe, which can perform aeration periodically. It can effectively scrub algae and other attached substances on the V-shaped channel, the three-dimensional vertical baffle on the outlet side, and the triangular overflow weir on the inlet side. The scrubbing water can be discharged back to the front end of the system for further treatment.

[0035] Example 1: The effluent scum baffle used as a radial flow primary sedimentation tank with a diameter of 40m is composed of multiple three-dimensional and two-dimensional scum baffles. The influent suspended solids are 200mg / L, the effluent suspended solids are 50mg / L, and no scum enters the collection tank.

[0036] Example 2: The effluent scum baffle used as a radial flow secondary sedimentation tank with a diameter of 35m is composed of multiple three-dimensional and two-dimensional scum baffles. The influent MLSS (mixed liquor suspended solids) concentration is 4000mg / L, and the effluent suspended solids concentration is 25mg / L. No scum enters the collection tank, and the sedimentation tank has a good effect on intercepting activated sludge.

[0037] Example 3: Used as a vertical flow primary sedimentation tank with a length of 8m and a width of 8m, it is assembled from multiple three-dimensional scum baffles and two-dimensional scum baffles. The influent suspended solids are 180mg / L, the effluent suspended solids are 40mg / L, and no scum enters the collection tank.

[0038] Example 4: Used as a vertical flow secondary sedimentation tank with a length of 8m and a width of 8m, it is assembled from multiple three-dimensional scum baffles and two-dimensional scum baffles. The influent MLSS concentration is 3500mg / L, the effluent suspended solids are 25mg / L, no scum enters the water collection tank, and the sedimentation tank has a good effect on intercepting activated sludge.

[0039] Contents not described in detail in this specification are prior art known to those skilled in the art. It is hereby indicated that the above description is intended to help those skilled in the art understand this invention, but does not limit the scope of protection of this invention. Any equivalent substitutions, modifications, improvements, and / or simplifications of the above descriptions that do not depart from the essential content of this invention fall within the scope of protection of this invention.

Claims

1. A scum baffle device based on three-phase separation flow guiding, characterized in that, The application relates to a sedimentation tank, which comprises a water collecting groove extending from the upper part of the inner side of the tank wall into the tank, an intersection angle between the left wall of the water collecting groove and the groove bottom is provided with a two-dimensional inclined baffle, the lower end of the two-dimensional inclined baffle is connected to the inner side of the tank wall, a V-shaped groove is formed between the upper part of the two-dimensional inclined baffle and the left wall of the water collecting groove, a three-dimensional vertical baffle is arranged above the V-shaped groove, the three-dimensional vertical baffle comprises a vertical steel plate, the left bottom of the vertical steel plate is a triangular protrusion folded from an integral steel plate, so that the vertical section of the three-dimensional vertical baffle is in the shape of an upright elevation symbol, the left wall of the water collecting groove is provided with a triangular overflow weir, and a water outlet channel is formed between the vertical steel plate and the triangular overflow weir. The gap between the lower inclined edge of the triangular protrusion and the upper end of the two-dimensional inclined baffle is the inlet of the water outlet channel. The lower surface of the two-dimensional inclined baffle is a slantwise floating surface of the air-containing sludge on the tank bottom so that the air-containing sludge rises to the water surface of the sedimentation tank to form scum, and the left surface of the vertical steel plate of the three-dimensional vertical baffle is a scum blocking surface. The lower inclined edge of the triangular protrusion is a slantwise floating edge of the air-containing sludge on the tank bottom so that the air-containing sludge rises to the water surface of the sedimentation tank to form scum, the left surface of the vertical steel plate of the three-dimensional vertical baffle is a scum blocking surface, and the upper inclined edge of the triangular protrusion is a downward sliding guide edge of the sinking sludge in the scum so that the sinking sludge slants downward to be far away from the water outlet area.

2. The scum baffle device based on three-phase separation flow guiding according to claim 1, characterized in that, A submerged aeration pipe is arranged on the sharp bottom in the V-shaped groove.

3. The scum baffle device based on three-phase separation flow guiding according to claim 1, characterized in that, The intersection angle between the upper inclined edge and the lower inclined edge of the triangular protrusion is farther away from the left wall of the water collecting groove than the upper end of the two-dimensional inclined baffle.

4. The scum baffle device based on three-phase separation flow guiding according to claim 1, characterized in that, An outlet groove embedded iron is arranged in the upper part of the left wall of the water collecting groove, and the three-dimensional vertical baffle is connected to the outlet groove embedded iron through an outlet groove cross support.

5. The scum baffle device based on three-phase separation flow guiding according to claim 1, characterized in that, An outlet groove embedded bolt connected to the two-dimensional inclined baffle is arranged on the groove bottom of the water collecting groove, and a tank wall embedded iron connected to the lower end of the two-dimensional inclined baffle is arranged on the inner side of the tank wall below the groove bottom of the water collecting groove.

6. The scum baffle device based on three-phase separation flow guiding according to claim 1, characterized in that, The lower end of the three-dimensional vertical baffle is 0.3-0.8 m away from the water surface, the upper end of the three-dimensional vertical baffle is 0.1-0.3 m higher than the water surface, and the right surface of the vertical steel plate of the three-dimensional vertical baffle is 0.2-0.5 m away from the left wall of the water collecting groove.

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