Sewage low-temperature nitrogen and phosphorus removal device

Abstract

The utility model relates to the technical field of low-temperature nitrogen and phosphorus removal of sewage, in particular to a low-temperature nitrogen and phosphorus removal device for sewage, which comprises a third treatment line, a second treatment line and a first treatment line. A backflow square well enters the biochemical pool 2 and the biochemical pool 1 of the second treatment line and the first treatment line respectively, so that a first-stage and second-stage AO operation mode is formed, the organic matter degradation efficiency is improved, the treatment capacity and the stability of the whole system are enhanced, the biochemical pools are connected in series in pairs, and the treatment efficiency is improved. The sewage is subjected to first-stage AO treatment to reduce part of pollutants such as nitrogen and phosphorus, and effluent enters second-stage AO treatment without adding any medicament, so that the pollutants such as nitrogen and phosphorus are further removed, the impact resistance of a biochemical system is enhanced, the removal efficiency of the biochemical system is improved, stable operation of the biochemical system in winter is ensured, and the environmental protection risk is reduced; meanwhile, the adding amount of a carbon source is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature denitrification and dephosphorization of sewage, in particular to a low-temperature denitrification and dephosphorization device for sewage. Background Art

[0002] With the acceleration of urbanization and increasing population density, the discharge of domestic and industrial wastewater continues to increase, and the demand for sewage treatment is also rising. Especially in densely populated areas, how to efficiently treat large amounts of sewage has become a pressing issue. Nitrogen and phosphorus are the main causes of eutrophication in water bodies. They can cause algae blooms, affect water quality, and even affect the health of aquatic ecosystems. Therefore, removing nitrogen and phosphorus from sewage has become a key goal of sewage treatment.

[0003] The existing sewage treatment AO operation process is greatly affected by water quality and water temperature, especially the low temperature in winter, which greatly limits the activity of nitrifying bacteria and denitrifying bacteria. If the water quality and water temperature fluctuate slightly, the biochemical effluent indicators will be difficult to control, and there is a risk of exceeding the standard. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the utility model provides a low-temperature denitrification and dephosphorization device for sewage.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a low-temperature denitrification and phosphorus removal device for sewage, comprising a No. 3 treatment line, a No. 2 treatment line and a No. 1 treatment line, the No. 3 treatment line respectively comprising 3 primary sedimentation tanks, 3 biochemical tanks, 3 secondary sedimentation tanks and 3 mixing sedimentation tanks, the No. 2 treatment line respectively comprising 2 primary sedimentation tanks, 2 biochemical tanks, 2 secondary sedimentation tanks and 2 mixing sedimentation tanks, the No. 1 treatment line respectively comprising 1 primary sedimentation tank, 1 biochemical tank, 1 secondary sedimentation tank and 1 mixing sedimentation tank, the 3 mixing sedimentation tanks being provided with a water pump, a return square well being provided between the 2 secondary sedimentation tanks and the 1 secondary sedimentation tank, a water guide pipe being provided on the water pump, one end of the water guide pipe being connected to the return square well, a pump body being provided on the return square well, a pipeline being provided on the pump body, the pipeline being respectively connected to the 2 biochemical tanks and the 1 biochemical tank, forming a dual-stage AO operation mode.

[0008] Furthermore, the present invention is improved in that a stirring device is provided in each of the 3rd, 2nd and 1st mixing and settling tanks, and the stirring device includes a driving motor and a stirring rod.

[0009] Furthermore, the present invention is improved in that both the pump body and the water pump are provided with a filtering device, the filtering device comprising a fixed tube and a filter screen, and the filter screen is detachably mounted inside the fixed tube.

[0010] Furthermore, the present invention has the improvement that monitoring equipment is provided on the No. 3 processing line, the No. 2 processing line and the No. 1 processing line.

[0011] Furthermore, the present invention is improved in that biological filler units are provided inside the three biochemical pools, the two biochemical pools and the one biochemical pool.

[0012] Furthermore, the present invention has the following improvements: temperature sensors and dissolved oxygen monitoring devices are provided inside the three biochemical pools, the two biochemical pools, and the one biochemical pool.

[0013] Furthermore, the present invention is improved in that a sludge scraper is provided in the 3 secondary sedimentation tanks, 1 secondary sedimentation tank, and 1 secondary sedimentation tank.

[0014] Furthermore, the present invention is improved in that mud discharge devices are provided inside the 3rd, 2nd and 1st mixing and settling tanks.

[0015] (3) Beneficial effects

[0016] Compared with the existing technology, the utility model provides a low-temperature sewage denitrification and dephosphorization device, which has the following beneficial effects:

[0017] The low-temperature denitrification and phosphorus removal device for sewage, by introducing the effluent from the 3rd sedimentation tank in the No. 3 treatment line into the return square well through a water pump and a water guide pipe, and then the effluent enters the 2nd biochemical pool and 1st biochemical pool of the No. 2 treatment line and the No. 1 treatment line respectively, forms a first-stage and second-stage dual-AO operation mode, improves the organic matter degradation efficiency, enhances the treatment capacity and stability of the entire system, and connects the biochemical pools in series. The sewage is treated with the AO of the first stage to reduce some nitrogen, phosphorus and other pollutants, and the effluent enters the second-stage AO treatment without adding any chemicals, further removing nitrogen, phosphorus and other pollutants, strengthening the impact resistance of the biochemical system, improving the removal efficiency of the biochemical system, ensuring the stable operation of the biochemical system in winter, reducing environmental risks, and reducing the amount of carbon source added, achieving good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the process structure of the utility model;

[0019] In the figure: 1. Treatment line No. 3; 2. Treatment line No. 2; 3. Treatment line No. 1; 4. Water pump; 5. Water pipe; 6. Return well. DETAILED DESCRIPTION

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

[0021] See also Figure 1 A low-temperature denitrification and phosphorus removal device for sewage, comprising a No. 3 treatment line 1, a No. 2 treatment line 2 and a No. 1 treatment line 3, wherein the No. 3 treatment line 1 comprises 3 primary sedimentation tanks, 3 biochemical tanks, 3 secondary sedimentation tanks and 3 mixing tanks, respectively; the No. 2 treatment line 2 comprises 2 primary sedimentation tanks, 2 biochemical tanks, 2 secondary sedimentation tanks and 2 mixing tanks, respectively; the No. 1 treatment line 3 comprises 1 primary sedimentation tank, 1 biochemical tank, 1 secondary sedimentation tank and 1 mixing tank, respectively; a water pump 4 is provided on the 3 mixing tanks, a return square well 6 is provided between the 2 secondary sedimentation tanks and the 1 secondary sedimentation tank, a water guide pipe 5 is provided on the water pump 4, one end of the water guide pipe 5 is connected to the return square well 6, a pump body is provided on the return square well 6, a pipeline is provided on the pump body, and the pipeline is connected to the 2 biochemical tanks and the 1 biochemical tank, respectively, to form a dual-stage AO operation mode.

[0022] During the actual use of the above structure, after the sewage enters the 3 primary sedimentation tank, the heavier suspended solid particles in the sewage will sink to the bottom under the action of gravity to form a sludge layer, and the clean water will rise and flow out through the overflow trough and enter the 3 biochemical tank. The sewage is aerated in the biochemical tank, and air is injected into the water to provide oxygen for microorganisms to carry out metabolic activities. The microorganisms decompose the organic matter in the sewage, produce carbon dioxide and water, and consume oxygen at the same time. The treated sewage enters the 3 mixing and settling tank. At this time, the water pump 4 in the 3 mixing and settling tank draws water into the water pipe 5, and then the water pipe 5 is introduced into the return well 6. This part of the water will flow back to the 2 biochemical tanks of the No. 2 treatment line 2 and the 1 biochemical tank of the No. 1 treatment line 3 through the pump body and the pipeline, so that this part of the water is mixed with the new sewage to form the AO operation mode. This reflux mechanism helps to improve the effect of biochemical treatment and promote the removal of pollutants.

[0023] In this embodiment, a stirring device is provided in each of the 3 mixing and settling tanks, the 2 mixing and settling tanks, and the 1 mixing and settling tank. The stirring device includes a drive motor and a stirring rod. The stirring device can maintain the uniformity and fluidity of the sewage, thereby improving the sewage treatment effect.

[0024] In this embodiment, a filtering device is provided on the pump body and the water pump 4. The filtering device includes a fixed tube and a filter screen. The filter screen can be detachably installed inside the fixed tube. The filtering device can improve the protection of the pump body and the water pump 4 and extend their service life.

[0025] In this embodiment, monitoring equipment is provided on the treatment line No. 3 1, the treatment line No. 2 2 and the treatment line No. 1 3, which can monitor the treatment line No. 3 1, the treatment line No. 2 2 and the treatment line No. 1 3 to ensure that their biochemical reaction processes in the sewage are not disturbed and meet the expected treatment effect.

[0026] In this embodiment, biological filler units are provided inside the three biochemical pools, the two biochemical pools, and the one biochemical pool to improve the degradation efficiency of organic matter.

[0027] In this embodiment, the 3 biochemical pools, 2 biochemical pools, and 1 biochemical pool are internally provided with temperature sensors and dissolved oxygen monitoring devices, which can simultaneously detect the temperature during the reaction process in the biochemical pools and the dissolved oxygen content during the biochemical reaction process.

[0028] In this embodiment, the 3 secondary sedimentation tanks, 1 secondary sedimentation tank, and 1 secondary sedimentation tank are provided with scrapers for quickly collecting and removing the settled sludge.

[0029] In this embodiment, the 3rd, 2nd and 1st mixing and settling tanks are all provided with mud discharge devices, which can regularly remove the settled sludge.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature sewage denitrification and dephosphorization device, characterized by: The invention comprises a treatment line No. 3 (1), a treatment line No. 2 (2) and a treatment line No. 1 (3), wherein the treatment line No. 3 (1) comprises 3 primary sedimentation tanks, 3 biochemical tanks, 3 secondary sedimentation tanks and 3 coagulation tanks respectively, the treatment line No. 2 (2) comprises 2 primary sedimentation tanks, 2 biochemical tanks, 2 secondary sedimentation tanks and 2 coagulation tanks respectively, the treatment line No. 1 (3) comprises 1 primary sedimentation tank, 1 biochemical tank, 1 secondary sedimentation tank and 1 coagulation tank respectively, the 3 coagulation tanks are provided with a water pump (4), a return well (6) is provided between the 2 secondary sedimentation tanks and the 1 secondary sedimentation tank, the water pump (4) is provided with a water guide pipe (5), one end of the water guide pipe (5) is connected to the return well (6), the return well (6) is provided with a pump body, the pump body is provided with a pipeline, the pipeline is connected to the 2 biochemical tanks and the 1 biochemical tank respectively, forming a dual-stage AO operation mode.

2. The low-temperature denitrification and dephosphorization device for sewage according to claim 1, characterized in that: The three settling tanks, the two settling tanks and the one settling tank are each provided with a stirring device, and the stirring device includes a driving motor and a stirring rod.

3. The low-temperature denitrification and dephosphorization device for sewage according to claim 2, characterized in that: The pump body and the water pump (4) are both provided with a filtering device, the filtering device comprising a fixed pipe and a filter screen, and the filter screen is detachably mounted inside the fixed pipe.

4. The low-temperature denitrification and dephosphorization device for sewage according to claim 3, characterized in that: The third processing line (1), the second processing line (2) and the first processing line (3) are all provided with monitoring equipment.

5. The low-temperature denitrification and dephosphorization device for sewage according to claim 4, characterized in that: Biological filler units are arranged inside the 3rd biochemical pool, the 2nd biochemical pool and the 1st biochemical pool.

6. The low-temperature denitrification and dephosphorization device for sewage according to claim 5, characterized in that: Temperature sensors and dissolved oxygen monitoring devices are provided inside the 3rd biochemical pool, the 2nd biochemical pool and the 1st biochemical pool.

7. The low-temperature denitrification and dephosphorization device for sewage according to claim 6, characterized in that: Sludge scrapers are provided in the 3 secondary sedimentation tanks, 1 secondary sedimentation tank and 1 secondary sedimentation tank.

8. The low-temperature denitrification and dephosphorization device for sewage according to claim 7, characterized in that: The 3rd, 2nd and 1st mixing and settling tanks are all provided with mud discharge devices.

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