Arc-shaped water inlet weir of denitrification filter tank

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly provides an arc-shaped water inlet weir of a denitrification filter tank, which comprises a weir body and a weir plate, the weir plate is fixed on the weir body, the weir plate is an arc-shaped plate, the upper end of the weir plate is tangent to the water inlet flow direction of an upstream water body, and the lower end of the weir plate extends below the water surface of a downstream water body; and the perforation rate of the weir plate is gradually increased along the water flow direction. The water inlet weir structure can effectively reduce water drop reoxygenation, reduce the adding amount of a carbon source, realize uniform water distribution and improve the denitrification efficiency.

Description

An arc-shaped inlet weir for a denitrification filter Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an arc-shaped inlet weir for a denitrification filter. Background Technology

[0002] Denitrification filters are important nitrogen removal units in wastewater treatment processes. Their principle is to utilize denitrifying bacteria to reduce nitrate nitrogen to nitrogen gas under anaerobic conditions, thereby achieving nitrogen removal. The influent weir, as a key component of the denitrification filter, functions to evenly distribute water and control the water flow to ensure an anaerobic environment within the filter, preventing dissolved oxygen (DO) concentration from rising and affecting the denitrification effect.

[0003] Traditional denitrification filter influent weirs are mostly straight weirs or sawtooth weirs, which have the following shortcomings:

[0004] 1. Severe reoxygenation due to cascading flow: The large drop height of water flow in straight weirs and sawtooth weirs increases the contact area between water and air, resulting in significant reoxygenation. This raises the dissolved oxygen concentration in the denitrification filter, affecting denitrification efficiency. 2. Carbon source waste: The increased dissolved oxygen concentration due to cascading reoxygenation requires denitrifying bacteria to consume more carbon for nitrogen removal, increasing carbon source dosage and operating costs. 3. Uneven water distribution: Straight weirs and sawtooth weirs tend to cause concentrated influent, leading to uneven hydraulic loading on the filter media surface, further affecting denitrification performance. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an arc-shaped inlet weir for a denitrification filter, which can effectively reduce the amount of water drop reoxygenation, reduce the amount of carbon source added, and at the same time achieve uniform water distribution and improve denitrification efficiency.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an arc-shaped inlet weir for a denitrification filter, including a weir body and a weir plate. The weir plate is fixed on the weir body and is an arc-shaped plate. The upper end is tangent to the inlet water flow direction of the upstream water body, and the lower end extends below the water surface of the downstream water body. A number of perforations are distributed on the weir plate, and the perforation rate of the weir plate gradually increases along the water flow direction.

[0007] In a preferred embodiment, the weir plate includes a first arc-shaped portion and a second arc-shaped portion. The first arc-shaped portion bends towards the upstream water body and is tangent to the direction of the incoming water flow. The second arc-shaped portion bends away from the weir body and extends below the water surface of the downstream water body.

[0008] In a preferred embodiment, the bending angle of the first arc-shaped portion and the second arc-shaped portion is 90°~180°.

[0009] In a preferred embodiment, the perforations are distributed on the weir plate above the weir body.

[0010] In a preferred embodiment, the perforation rate is 10% to 50%.

[0011] In a preferred embodiment, the diameter of the perforation is 5~20mm.

[0012] In a preferred embodiment, the weir plate is provided with vertically arranged waist holes, and expansion bolts are installed in the waist holes to fix the weir plate to the weir body.

[0013] In a preferred embodiment, a pad is provided between the weir plate and the weir body, and expansion bolts are passed through the weir plate and the pad in sequence and then fixed to the weir body.

[0014] In a preferred embodiment, the pad is made of rubber.

[0015] In a preferred embodiment, the weir plate is made of stainless steel or engineering plastic.

[0016] The arc-shaped inlet weir of this utility model for a denitrification filter has the following beneficial effects:

[0017] 1. Reduced reoxygenation by cascading water: The arc-shaped weir plate design allows for a smooth water flow transition, significantly reducing the water drop height and the contact area between the water and air, effectively inhibiting reoxygenation by cascading water and maintaining anoxic environment in the denitrification filter.

[0018] 2. Reduce carbon source dosage: By reducing the amount of reoxygenation in the cascade, the dissolved oxygen concentration is reduced, the denitrification efficiency is improved, the consumption of carbon source during the denitrification process is reduced, and the operating cost is lowered.

[0019] 3. Uniform water distribution: The perforated design and gradually varying perforation rate on the weir plate achieve uniform water distribution, avoid excessive local hydraulic load, and improve the denitrification effect.

[0020] 4. Reduce hydraulic losses: The arc-shaped structure reduces water flow impact, lowers hydraulic losses, and improves energy utilization efficiency. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 is a schematic diagram of the structure of this utility model;

[0023] Figure 2 is a schematic diagram of the front structure of the weir plate of this utility model;

[0024] In the diagram: 1. Weir body; 2. Weir plate; 201. Perforation; 202. First arc section; 203. Second arc section; 204. Waist hole; 3. Upstream water body; 4. Downstream water body; 5. Expansion bolt; 6. Pad plate. Detailed Implementation

[0025] Example 1:

[0026] An arc-shaped inlet weir for a denitrification filter includes a weir body 1 and weir plates 2. The weir plates 2 are fixed to the weir body 1, which has a rectangular structure. Multiple weir plates 2 are arranged along the length of the weir body 1. Specifically, the weir plates 2 are installed on the weir body 1 using expansion bolts 5.

[0027] The weir plate 2 is an arc-shaped plate, with its upper end tangent to the inflow direction of the upstream water body 3 and its lower end extending below the water surface of the downstream water body 4. Specifically, the weir plate 2 includes a first arc-shaped part 202 and a second arc-shaped part 203. The first arc-shaped part 202 bends towards the upstream water body 3 and is tangent to the inflow direction, while the second arc-shaped part 203 bends away from the weir body 1 and extends below the water surface of the downstream water body 4. This structural design allows the water flow to transition smoothly along the arc-shaped surface of the weir plate, reducing the drop height of the water flow and thus reducing the reoxygenation of the drop.

[0028] Preferably, the bending angle of the first arc-shaped portion 202 and the second arc-shaped portion 203 is 90°~180° to ensure that the water flow forms a stable laminar flow state on the surface of the weir plate, thereby reducing turbulence and bubble generation.

[0029] As shown in Figure 2, several perforations 201 are distributed on the weir plate 2 above the weir body 1. The perforation rate of the weir plate 2 gradually increases along the water flow direction, and the perforation rate is 10%~50% in order to achieve uniform water distribution and avoid excessive local hydraulic load.

[0030] The perforation 201 has a diameter of 5~20mm to control the water flow rate and reduce water flow impact and air bubble entrainment.

[0031] The weir plate 2 is made of stainless steel or engineering plastic, and has good corrosion resistance and mechanical strength.

[0032] The working principle of this utility model is as follows:

[0033] 1. Weir body; 2. Weir plate; 201. Perforation; 202. First arc section; 203. Second arc section; 204. Waist hole; 3. Upstream water body; 4. Downstream water body; 5. Expansion bolt; 6. Pad plate.

[0034] Wastewater enters weir 1 through the inlet. Because weir plate 2 has an arc-shaped structure and its upper end is tangential to the direction of the incoming water flow, the water flows smoothly along the surface of weir plate 2, avoiding the cascading phenomenon common in traditional straight or sawtooth weirs. This significantly reduces the contact area between the water and air, effectively minimizing the risk of reoxygenation. Simultaneously, the perforated design 201 ensures uniform water distribution as it passes through weir plate 2, preventing excessive local hydraulic loads and further reducing turbulence and bubble generation.

[0035] By reducing the amount of reoxygenation through cascading water, this invention can maintain an anaerobic environment in the denitrification filter, reduce dissolved oxygen concentration, thereby improving the nitrogen removal efficiency of denitrifying bacteria, reducing carbon source addition, and lowering operating costs.

[0036] Example 2:

[0037] Unlike Embodiment 1, the weir plate 2 is provided with vertically arranged waist holes 204, and expansion bolts 5 are installed in the waist holes 204 to fix the weir plate 2 to the weir body 1.

[0038] The waist hole 204 is set vertically, which allows the weir plate 2 to be moved up and down relative to the expansion bolt 5, thereby adjusting the installation height of the weir plate 2. The height of the weir plate 2 can be easily adjusted according to the liquid level of the upstream water body.

[0039] A pad 6, made of rubber, is provided between the weir plate 2 and the weir body 1. Expansion bolts 5 are passed through the weir plate 2 and the pad 6 in sequence and then fixed to the weir body 1. By setting the pad 6, the weir plate 2, the pad 6, and the weir body 1 are tightly fitted together, improving the installation stability of the weir plate 2.

[0040] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The embodiments and features described in this application can be arbitrarily combined without conflict. The protection scope of this utility model should be defined as the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A denitrification filter tank arc-shaped water inlet weir, comprising a weir body (1) and a weir plate (2), characterized in that: The weir plate (2) is fixed on the weir body (1). The weir plate (2) is an arc-shaped plate. Its upper end is tangent to the water flow direction of the upstream water body (3), and its lower end extends below the water surface of the downstream water body (4). Several perforations (201) are distributed on the weir plate (2). The perforation rate of the weir plate (2) gradually increases along the water flow direction.

2. The curved inlet weir for a denitrifying filter according to claim 1, characterized in that: The weir plate (2) includes a first arc-shaped part (202) and a second arc-shaped part (203). The first arc-shaped part (202) bends towards the upstream water body (3) and is tangent to the direction of the incoming water flow. The second arc-shaped part (203) bends away from the weir body (1) and extends below the water surface of the downstream water body (4).

3. A curved inlet weir for a denitrifying filter according to claim 2, characterized in that: The bending angles of the first arc-shaped portion (202) and the second arc-shaped portion (203) are 90° to 180°.

4. The curved inlet weir for a denitrifying filter according to claim 1, characterized in that: The perforations (201) are distributed on the weir plate (2) above the weir body (1).

5. The arc-shaped inlet weir of a denitrification filter according to claim 1, characterized in that: The perforation rate of the perforation (201) is 10%~50%.

6. The curved inlet weir for a denitrifying filter according to claim 1, characterized in that: The diameter of the perforation (201) is 5~20mm.

7. The arc-shaped inlet weir of a denitrification filter according to claim 1, characterized in that: The weir plate (2) is provided with vertically arranged waist holes (204), and expansion bolts (5) are installed in the waist holes (204) to fix the weir plate (2) to the weir body (1).

8. The curved inlet weir for a denitrifying filter according to claim 1, characterized in that: A pad (6) is provided between the weir plate (2) and the weir body (1), and expansion bolts (5) are passed through the weir plate (2) and the pad (6) in sequence and then fixed on the weir body (1).

9. A denitrifying filter basin arc-shaped water inlet weir according to claim 8, characterized in that: The pad (6) is made of rubber.

10. The arc-shaped inlet weir of a denitrification filter according to claim 1, characterized in that: The weir plate (2) is made of stainless steel or engineering plastic.

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