Oxidation ditch type A2 / O nitrogen and phosphorus removal device

Abstract

The utility model discloses an oxidation ditch type A2 / O nitrogen and phosphorus removal device, and relates to the technical field of treatment of water, wastewater, sewage or sludge. An oxidation ditch type A2 / O nitrogen and phosphorus removal device comprises a non-aeration oxidation ditch, an aeration oxidation ditch and a sedimentation tank which are connected through pipelines, and a foam fishing structure which is located on the aeration oxidation ditch and comprises a discharging pipe, a fishing frame, a plurality of fishing plates and a gear ring. The discharging pipe is fixedly connected to the interior of the aeration oxidation ditch, one end of the discharging pipe rotationally extends to the exterior of the aeration oxidation ditch, under the cooperation of the discharging pipe, the salvage frame, the salvage plates, a gear ring and a gear, the salvage frame can drive the multiple salvage plates to salvage foam floating on the sewage surface, and therefore sewage in the salvage plates can be discharged through water filtering holes; and the salvage plate can discharge the salvaged foam into the discharge pipe, so that the foam can be salvaged continuously and effectively.

Description

Technical Field

[0001] This utility model relates to the field of water, wastewater, sewage or sludge treatment technology, and in particular to an oxidation ditch type A2 / O denitrification and phosphorus removal device. Background Technology

[0002] Among existing wastewater treatment technologies, oxidation ditch-type A2 / O (anaerobic-anoxic-aerobic) nitrogen and phosphorus removal devices are widely used due to their high efficiency and stable treatment performance. This device achieves effective removal of pollutants such as nitrogen and phosphorus from wastewater through the organic combination of anaerobic, anoxic, and aerobic functional zones.

[0003] In actual operation, a large amount of foam often forms on the surface of oxidation ditches. This foam is mainly composed of grease, surfactants, and microbial metabolites in the wastewater. It not only affects the aesthetics of the oxidation ditch, but more importantly, the presence of foam interferes with the aeration effect, reduces oxygen transfer efficiency, and thus affects the treatment efficiency of nitrogen and phosphorus removal. The treatment of foam on oxidation ditches mainly relies on manual removal or natural dissipation. Although manual removal can quickly reduce the amount of foam, it is labor-intensive and difficult to continuously and effectively remove foam. Natural dissipation is affected by weather, water temperature and other conditions, and has great uncertainty. Therefore, we propose an oxidation ditch type A2 / O nitrogen and phosphorus removal device. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide an oxidation ditch type A2 / O denitrification and phosphorus removal device that can solve the problem of foam treatment on oxidation ditches, which mainly relies on manual dredging or natural dissipation. Although manual dredging can quickly reduce the amount of foam, it is labor-intensive and difficult to continuously and effectively dredge the foam; while natural dissipation is affected by weather, water temperature and other conditions, and has a large degree of uncertainty.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an oxidation ditch type A2 / O denitrification and phosphorus removal device, comprising:

[0006] Non-aerated oxidation ditch, aerated oxidation ditch and sedimentation tank are connected by pipelines respectively;

[0007] The foam dredging structure is located on the aerated oxidation ditch;

[0008] The foam retrieval structure includes a discharge pipe, a retrieval frame, multiple retrieval plates, and a toothed ring. The discharge pipe is fixedly connected inside the aerated oxidation ditch, with one end of the discharge pipe extending rotatably to the outside of the aerated oxidation ditch. The retrieval frame is rotatably fitted onto the outer surface of the discharge pipe, with one end of the retrieval frame extending rotatably into the outside of the aerated oxidation ditch. Multiple retrieval plates are fixedly connected to the outer surface of the retrieval frame, and the toothed ring is fixedly fitted onto the outer surface of the retrieval frame. The toothed ring is located on the side of the aerated oxidation ditch closer to the sedimentation tank. An inlet is provided on the outer surface of the discharge pipe, and multiple filter holes are provided on each of the multiple retrieval plates.

[0009] Preferably, the foam dredging structure further includes a rotating motor, a gear, and a support plate. The support plate is fixedly connected to the top of the aerated oxidation ditch, the rotating motor is fixedly installed on the top of the support plate, the output end of the rotating motor is fixedly connected to the gear, and the gear meshes with the gear ring.

[0010] Preferably, all of the aforementioned retrieval plates are "L" shaped.

[0011] Preferably, two rotating brush aeration rollers are rotatably installed inside the aerated oxidation ditch, and drive motors are fixedly installed on both sides of the aerated oxidation ditch. The output ends of the two drive motors rotatably extend into the interior of the aerated oxidation ditch and are fixedly connected to the corresponding rotating brush aeration rollers.

[0012] Preferably, a sludge return pipe is fixedly connected to the side of the sedimentation tank away from the aerated oxidation ditch, and the end of the sludge return pipe away from the sedimentation tank is connected to the interior of the non-aerated oxidation ditch.

[0013] Preferably, a sludge pump is fixedly installed on the sludge return pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This oxidation ditch type A2 / O denitrification and phosphorus removal device, through the cooperation of discharge pipe, scooping frame, scooping plate, gear ring and gear, enables the scooping frame to drive multiple scooping plates to scoop up the foam floating on the surface of the sewage, so that the sewage in the scooping plate can be discharged through the filter holes, and the scooping plate will discharge the scooped foam into the discharge pipe, thus enabling continuous and effective scooping of foam. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the aerated oxidation ditch structure of this utility model;

[0019] Figure 3This is a schematic diagram of the material discharge pipe structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the salvage frame structure of this utility model.

[0021] Attached reference numerals: 1. Non-aerated oxidation ditch; 2. Aerated oxidation ditch; 3. Sedimentation tank; 4. Return sludge pipe; 5. Sludge pump; 6. Rotary brush aeration roller; 7. Drive motor; 8. Retrieval frame; 9. Gear; 10. Discharge pipe; 11. Retrieval plate; 12. Rotary motor; 13. Gear ring; 14. Feed inlet; 15. Filter hole; 16. Support plate. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Please see Figure 1-4 This utility model provides a technical solution: an oxidation ditch type A2 / O denitrification and phosphorus removal device, comprising:

[0027] Non-aerated oxidation ditch 1, aerated oxidation ditch 2, and sedimentation tank 3 are connected by pipes.

[0028] The foam dredging structure is located on the aerated oxidation ditch 2;

[0029] The foam retrieval structure includes a discharge pipe 10, a retrieval frame 8, multiple retrieval plates 11, and a toothed ring 13. The discharge pipe 10 is fixedly connected to the inside of the aerated oxidation ditch 2, and one end of the discharge pipe 10 extends rotatably to the outside of the aerated oxidation ditch 2. The retrieval frame 8 is rotatably sleeved on the outer surface of the discharge pipe 10, and one end of the retrieval frame 8 extends rotatably into the outside of the aerated oxidation ditch 2. Multiple retrieval plates 11 are all fixedly connected to the outer surface of the retrieval frame 8, and all multiple retrieval plates 11 are "L" shaped. The toothed ring 13 is fixedly sleeved on the outer surface of the retrieval frame 8, and the toothed ring 13 is located on the side of the aerated oxidation ditch 2 near the sedimentation tank 3. An inlet 14 is opened on the outer surface of the discharge pipe 10, and multiple filter holes 15 are opened on the multiple retrieval plates 11.

[0030] The foam dredging structure also includes a rotating motor 12, a gear 9, and a support plate 16. The support plate 16 is fixedly connected to the top of the aeration oxidation ditch 2. The rotating motor 12 is fixedly installed on the top of the support plate 16. The output end of the rotating motor 12 is fixedly connected to the gear 9. The gear 9 is meshed with the gear ring 13.

[0031] The aerated oxidation ditch 2 has two rotating aeration rollers 6 installed inside. Both sides of the aerated oxidation ditch 2 are fixedly installed with drive motors 7. The output ends of the two drive motors 7 extend into the interior of the aerated oxidation ditch 2 and are fixedly connected to the corresponding rotating aeration rollers 6. The sedimentation tank 3 is fixedly connected to the side away from the aerated oxidation ditch 2 with a return sludge pipe 4. The end of the return sludge pipe 4 away from the sedimentation tank 3 is connected to the interior of the non-aerated oxidation ditch 1. A sludge pump 5 is fixedly installed on the return sludge pipe 4.

[0032] Furthermore, when using this device, the pretreated wastewater and the returned sludge from sedimentation tank 3 both enter the non-aerated oxidation ditch 1. The hydraulic retention time of the non-aerated oxidation ditch 1 is 2-6 hours, and the sludge return ratio is 40-100%. After entering the non-aerated oxidation ditch 1, the returned sludge is rapidly diluted, and the dissolved oxygen concentration in the ditch drops to below 0.5 mg / L. Nitrate is reduced to N2 and removed from the wastewater under the action of denitrifying bacteria. Downstream of each inlet point, as the nitrate concentration decreases, the oxidation-reduction potential further decreases, forming an anaerobic zone. Polyphosphate-accumulating bacteria carry out anaerobic phosphorus release in the anaerobic zone, and the returned sludge... The dissolved oxygen in the sludge is rapidly diluted, which reduces the adverse effects of dissolved oxygen on nitrogen and phosphorus removal, improves the removal efficiency of total nitrogen and carbon source utilization. The wastewater then enters the aerated oxidation ditch 2 to continue the removal of organic matter, biological nitrification and aerobic phosphorus uptake process, removing organic matter, ammonia nitrogen and total phosphorus from the wastewater. The dissolved oxygen in the aerated oxidation ditch needs to be maintained above 2 mg / L and the hydraulic retention time is 6-12 h. The sludge-water mixture flowing out of the aerated oxidation ditch 2 undergoes solid-liquid separation in the sedimentation tank 3. Some of the sludge in the sedimentation tank 3 will be returned to the non-aerated oxidation ditch 1 by the sludge pump 5 through the return sludge pipe 4.

[0033] Furthermore, when using this device, when the wastewater enters the aerated oxidation ditch 2, two drive motors 7 are started by connecting to an external power source. The two drive motors 7 will drive the corresponding rotating brush aeration rollers 6 to rotate. During the rotation of the two rotating brush aeration rollers 6, the brushes come into contact with the water, continuously introducing oxygen from the air into the water and throwing the water into the air to fully contact with the air. The air quickly dissolves into the water, completing the oxygenation process. At the same time, the pushing action of the aeration rotating brushes on the water ensures that there is a flow velocity of 0.15 to 0.3 m / s at the bottom of the tank, so that the activated sludge is in a suspended migration state and mixes well with the influent.

[0034] Furthermore, when using this device, the rotating motor 12 is started by connecting an external power source. The rotating motor 12 drives the gear 9 to rotate, which in turn drives the gear ring 13 to rotate the retrieval frame 8. The rotation of the retrieval frame 8 drives multiple retrieval plates 11 to rotate. Since the multiple retrieval plates 11 are all L-shaped, they can retrieve the foam floating on the surface of the sewage. Because the foam is composed of a large number of tiny bubbles, these bubbles form a stable thin film structure, giving the foam a certain degree of elasticity and stability. When the foam comes into contact with the retrieval plate 11, due to the surface tension of the foam, it tends to remain on the surface of the retrieval plate 11 rather than flowing down through the filter holes 15, making it difficult for it to leak out of the filter holes 15. However, the sewage can leak out of the filter holes 15, thus ensuring that the retrieval plate 11 only retrieves foam. When the retrieval plate 11 rotates to the feed inlet 14, the foam inside the retrieval plate 11 is discharged into the discharge pipe 10 and then discharged from the discharge pipe 10.

[0035] With the cooperation of the discharge pipe 10, the retrieval frame 8, the retrieval plate 11, the gear ring 13 and the gear 9, the retrieval frame 8 will drive multiple retrieval plates 11 to retrieve the foam floating on the surface of the sewage. As a result, the filter hole 15 can discharge the sewage in the retrieval plate 11, and the retrieval plate 11 will discharge the retrieved foam into the discharge pipe 10, thereby enabling continuous and effective retrieval of foam.

[0036] Structural Description: Non-aerated oxidation ditch 1: It can promote the mixing and circulation of sewage and sludge, and is equipped with an underwater propulsion device inside;

[0037] Aerated oxidation ditch 2: used for the continuous circulation of sewage and activated sludge in the aeration channel;

[0038] Sedimentation tank 3: capable of separating sludge from wastewater;

[0039] Return sludge pipe 4: will return some of the sludge into the non-aerated oxidation ditch 1;

[0040] Rotating brush aeration roller 6: During the rotation process, the brush blades come into contact with the water, continuously introducing oxygen from the air into the water, and throwing the water into the air to fully contact the air. The air quickly dissolves into the water, completing the oxygenation process.

[0041] Salvage frame 8: Rotatably sleeved on the outer surface of discharge pipe 10, facilitating the installation of multiple salvage plates 11 on the outer surface for salvage work;

[0042] Gear 9: meshes with gear ring 13 and can drive the retrieval frame 8 to rotate on the outer surface of discharge pipe 10;

[0043] Discharge pipe 10: Supports the rotation of the salvage frame 8, while foam can be discharged from the inlet 14 into its interior.

[0044] Salvage plate 11: It has an "L" shaped structure and can salvage foam floating on the surface of sewage.

[0045] Inlet 14: allows the retrieved foam to be discharged into the discharge pipe 10 from its opening;

[0046] Filter hole 15: It can discharge the sewage retrieved on the retrieval plate 11 and at the same time intercept the foam.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An oxidation ditch type A2 / O denitrification and phosphorus removal device, characterized in that, include: Non-aerated oxidation ditch (1), aerated oxidation ditch (2) and sedimentation tank (3) are connected by pipes respectively; The foam dredging structure is located on the aerated oxidation ditch (2); The foam retrieval structure includes a discharge pipe (10), a retrieval frame (8), multiple retrieval plates (11) and a toothed ring (13). The discharge pipe (10) is fixedly connected to the inside of the aeration oxidation ditch (2). One end of the discharge pipe (10) extends rotatably to the outside of the aeration oxidation ditch (2). The retrieval frame (8) is rotatably sleeved on the outer surface of the discharge pipe (10). One end of the retrieval frame (8) extends rotatably into the outside of the aeration oxidation ditch (2). Among them, multiple retrieval plates (11) are fixedly connected to the outer surface of the retrieval frame (8), and toothed rings (13) are fixedly sleeved on the outer surface of the retrieval frame (8). The toothed rings (13) are located on the side of the aerated oxidation ditch (2) close to the sedimentation tank (3). The discharge pipe (10) has an inlet (14) on its outer surface, and multiple scooping plates (11) have multiple water filter holes (15).

2. The oxidation ditch type A2 / O denitrification and phosphorus removal device according to claim 1, characterized in that: The foam dredging structure also includes a rotating motor (12), a gear (9) and a support plate (16), with the support plate (16) fixedly connected to the top of the aerated oxidation ditch (2); Among them, the rotating motor (12) is fixedly installed on the top of the support plate (16), and the output end of the rotating motor (12) is fixedly connected to the gear (9). The gear (9) is meshed with the gear ring (13).

3. The oxidation ditch type A2 / O denitrification and phosphorus removal device according to claim 1, characterized in that: All of the aforementioned salvage plates (11) are "L" shaped.

4. The oxidation ditch type A2 / O denitrification and phosphorus removal device according to claim 1, characterized in that: The aerated oxidation ditch (2) has two rotating brush aeration rollers (6) rotatably installed inside. Both sides of the aerated oxidation ditch (2) are fixedly installed with drive motors (7). The output ends of the two drive motors (7) rotatably extend into the interior of the aerated oxidation ditch (2) and are fixedly connected to the corresponding rotating brush aeration rollers (6).

5. The oxidation ditch type A2 / O denitrification and phosphorus removal device according to claim 1, characterized in that: The sedimentation tank (3) is fixedly connected to a return sludge pipe (4) on the side away from the aerated oxidation ditch (2), and the end of the return sludge pipe (4) away from the sedimentation tank (3) is connected to the interior of the non-aerated oxidation ditch (1).

6. The oxidation ditch type A2 / O denitrification and phosphorus removal device according to claim 5, characterized in that: A sludge pump (5) is fixedly installed on the return sludge pipe (4).

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