Aerobic biological treatment system for sewage in low-temperature environment

Abstract

The utility model discloses an aerobic biological treatment system for sewage in a low-temperature environment, which belongs to the field of sewage treatment and comprises a tank body, a biological membrane suspended filler, an aeration pipe, a microporous aeration disc, a high-speed fan, a banana-shaped stirring blade, a temperature sensor, a dissolved oxygen sensor, an auxiliary heating system, a microporous stainless steel screen and a perforated blowing and supporting pipe, microorganisms realize low-temperature domestication culture, and biological membrane suspended filler attached with the microorganisms is uniformly distributed in the tank body, so that psychrophilic bacteria and low-temperature nitrifying bacteria are enriched and stabilized, the system has heating and heat preservation functions, and stable operation of the sewage aerobic biological treatment system in a low-temperature environment is realized.

Description

Technical Field

[0001] The utility model relates to an aerobic biological treatment system for low-temperature environmental sewage, belonging to the field of sewage treatment. Background Art

[0002] Aerobic biological treatment is an important step in the A2O activated sludge biological process to remove organic matter and ammonia nitrogen from sewage. Winters are cold in most parts of northern my country, especially in Inner Mongolia and Northeast China. The sewage temperature is below 10°C in winter, while the optimal temperature for aerobic biological treatment is 15-30°C. When the temperature is below 10°C, the growth rate of microorganisms is slow, resulting in a decrease in winter treatment effect.

[0003] Aerobic biological treatment systems will discharge sludge regularly, thereby expelling some effective microorganisms from the treatment system, reducing the amount of microorganisms in the pool. Re-acclimation takes a long time, which reduces the effectiveness of aerobic biological treatment. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art, provide a low-temperature environment sewage aerobic biological treatment system, and solve the problems in the prior art.

[0005] The utility model discloses an aerobic biological treatment system for low-temperature environmental sewage, comprising a tank body, a biofilm suspension filler, an aeration pipe, a microporous aeration disc, a high-speed fan, a banana-shaped stirring blade, a temperature sensor, a dissolved oxygen sensor, and an auxiliary heating system. The water inlet direction and the water outlet direction of the system are perpendicular, a microporous stainless steel screen is arranged in the water outlet direction, and a perforated blowing tube is arranged on the side of the microporous stainless steel screen; the auxiliary heating system comprises a heat preservation plate and a heating wire; the biofilm suspension filler is a honeycomb-like structure with a diameter of 2 cm and a thickness of 1 cm, and is synthesized from polyethylene, with a regular hexagonal structure in the center, 6 pentagonal structures in the second layer from the center to the outside, a quadrilateral in the third layer, and a circular structure in the outermost layer, and the surface of the biofilm suspension filler is micro-serrated to increase the specific surface area of ​​the biofilm suspension filler and increase the amount of biological attachment.

[0006] Furthermore, the microporous aeration plate and the perforated blowing tube are connected to the aeration pipe, and the aeration volume, fan speed and outlet temperature are adjusted by automatic control valves to ensure the dissolved oxygen content in the water body, while ensuring the air volume of the perforated blowing tube to ensure that the biofilm suspended filler does not accumulate at the outlet.

[0007] Furthermore, the single-piece size of the microporous stainless steel screen 9 is 1000*2000mm, and micropores are arranged at intervals on the screen. The function of the micropores is to provide a water outlet channel and an air outlet for the perforated blowing tube. The horizontal center spacing of the micropores is 35mm, the vertical center spacing of the micropores is 25mm, the diameter of the micropores is 15mm, the horizontal and vertical micropores are arranged at intervals, and the horizontal center spacing of the horizontal and vertical micropores is 17.5mm. The microporous stainless steel screen 9 is spliced ​​and combined according to the designed pool size, water flow size, and biofilm suspended filler size to achieve the interception and water outlet functions of biofilm suspended fillers in pools of different sizes.

[0008] The beneficial effects of the utility model are:

[0009] (1) The system uses microporous aeration disks, blowers, and banana-shaped stirring blades to increase the dissolved oxygen content of the system and the flow of the biofilm suspension filler. The biofilm suspension filler floats up and down, and the microorganisms adhere to the various surfaces of the biofilm suspension filler, so that the microorganisms are always fixed inside the biofilm suspension filler. The amount of microorganisms in the biological pool will not be reduced due to sludge screening. At the same time, the biofilm suspension filler plays a role in heat preservation and protection for the microorganisms. The heat generated by biodegradation in the biofilm suspension filler is more concentrated, forming a biodegradation microenvironment, thereby improving the biodegradation efficiency;

[0010] (2) Through temperature screening and enrichment of low-temperature resistant microorganisms, the dominant species of specialized low-temperature microorganisms such as psychrophilic bacteria and low-temperature nitrifying bacteria attach to the biofilm suspension filler at 10°C and continue to work at low temperatures, ensuring the sewage treatment efficiency at low temperatures;

[0011] (3) The water inlet and outlet directions of the system are set perpendicularly, so that the water flow in the system forms a circular flow direction, which reduces the accumulation of biofilm suspended fillers formed when the water inlet and outlet are in the same direction. At the same time, a microporous stainless steel screen and a perforated blowing tube are set in the outlet direction to intercept the biofilm suspended fillers and blow them back into the system. While ensuring the water outlet, the accumulation and blockage of biofilm suspended fillers at the outlet are reduced, so that the system can operate stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a diagram of an aerobic biological treatment system for low-temperature sewage of the utility model;

[0013] Figure 2 This is a front view of the microporous stainless steel screen 9 of the utility model;

[0014] Figure 3 It is a top view of the structure of the biofilm suspension filler 1 of the utility model. DETAILED DESCRIPTION

[0015] The utility model discloses an aerobic biological treatment system for sewage in a low-temperature environment. The system comprises a tank body 14, a biofilm suspension filler 1, an aeration pipe 2, a microporous aeration disc 3, a high-speed fan 4, a banana-shaped stirring blade 5, a temperature sensor 6, a dissolved oxygen sensor 7, and an auxiliary heating system 8. The water inlet direction and the water outlet direction of the system are perpendicular. A microporous stainless steel screen 9 is arranged in the water outlet direction, and a perforated blowing tube 10 is arranged on the side of the microporous stainless steel screen 9; the auxiliary heating system 8 comprises a heat preservation plate 11 and a heating wire 12; the biofilm suspension filler 1 is a honeycomb-like structure with a diameter of 2 cm and a thickness of 1 cm, and is synthesized from polyethylene, with a regular hexagonal structure in the center, 6 pentagonal structures in the second layer from the center to the outside, a quadrilateral in the third layer, and a circular structure in the outermost layer. The surface of the biofilm suspension filler 1 is micro-serrated, so as to increase the specific surface area of ​​the biofilm suspension filler 1 and the amount of biological attachment.

[0016] Furthermore, the microporous aeration plate 3 and the perforated blowing tube 10 are connected to the aeration pipe 2, and the aeration volume, fan speed and outlet temperature are adjusted by the automatic control valve 13 to ensure the content of dissolved oxygen in the water body, while ensuring the aeration volume of the perforated blowing tube 10, ensuring that the biofilm suspended filler 1 does not accumulate at the water outlet, and also ensuring the reaction temperature of the microorganisms in the biofilm suspended filler 1.

[0017] Furthermore, the size of a single piece of the microporous stainless steel screen 9 is 1000*2000mm, and micropores are arranged at intervals on the screen. The horizontal center spacing of the micropores is 35mm, the vertical center spacing of the micropores is 25mm, the diameter of the micropores is 15mm, the horizontal and vertical micropores are arranged at intervals, and the horizontal center spacing of the horizontal and vertical micropores is 17.5mm. The microporous stainless steel screen 9 is spliced ​​and combined according to the designed pool size, water flow size, and biofilm suspended filler size to achieve the functions of intercepting and discharging biofilm suspended fillers in pools of different sizes.

[0018] Working principle: sewage enters the aerobic biological tank body, and under the aeration of the microporous aeration plate 3 and the stirring action of the banana-shaped stirring blade 5, the water body and the biofilm suspended filler flow up and down with the activated sludge. When the surface of the biofilm suspended filler 1 is covered with microorganisms, the tank body reaches a stable state, and the microorganisms degrade pollutants such as total nitrogen, ammonia nitrogen, and organic pollutants in the sewage. The high-speed fan 4 ensures the temperature and aeration volume of the aeration gas. When the reaction time is reached, the water flows out from the direction perpendicular to the inlet water. A microporous stainless steel screen 9 is set at the water outlet to only allow the purified water to flow out and intercept the biofilm suspended filler 1 in the tank body. The perforated blowing tube 10 blows the biofilm suspended filler back into the tank body, and the microbial degradation continues, so that the system maintains a stable microbial degradation capacity; when the sludge concentration exceeds the set value, the sludge is discharged, and the biofilm suspended filler is still in the tank body, so the microorganisms in the tank body do not decrease with the sludge discharge and have the ability to regenerate, thereby ensuring the stable operation of the low-temperature environment aerobic biological treatment system.

[0019] The low-temperature environment sewage aerobic biological treatment system of the utility model is not limited to the above-mentioned specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution, which also fall within the technical innovation scope of the utility model.

Claims

1. A low-temperature environment sewage aerobic biological treatment system, characterized by: The system comprises a tank body (14), a biofilm suspension filler (1), an aeration pipe (2), a microporous aeration disk (3), a high-speed fan (4), a banana-shaped stirring blade (5), a temperature sensor (6), a dissolved oxygen sensor (7), and an auxiliary heating system (8). The water inlet direction and the water outlet direction of the system are perpendicular. A microporous stainless steel screen (9) is arranged in the water outlet direction. A perforated blowing tube (10) is arranged on the side of the microporous stainless steel screen (9). The auxiliary heating system (8) comprises an insulation board (11) and a heating wire (12). The biofilm suspension filler (1) is a honeycomb-like structure with a diameter of 2 cm and a thickness of 1 cm. It is synthesized from polyethylene, with a regular hexagonal structure in the center, 6 pentagonal structures in the second layer from the center to the outside, a quadrilateral structure in the third layer, and a circular structure in the outermost layer. The surface of the biofilm suspension filler (1) is micro-serrated, so as to increase the specific surface area of ​​the biofilm suspension filler (1) and increase the amount of biological attachment.

2. The low-temperature environmental sewage aerobic biological treatment system according to claim 1 is characterized in that: The microporous aeration plate (3) and the perforated blowing tube (10) are connected to the aeration pipe (2). The aeration volume, fan speed and outlet temperature are adjusted by the automatic control valve (13) to ensure the content of dissolved oxygen in the water body. At the same time, the aeration volume of the perforated blowing tube (10) is ensured to ensure that the biofilm suspended filler (1) does not accumulate at the outlet.

3. The low-temperature environmental sewage aerobic biological treatment system according to claim 1 is characterized in that the microporous The size of a single piece of the stainless steel screen (9) is 1000*2000mm. Micropores are arranged at intervals on the screen. The function of the micropores is to provide a water outlet channel and an air outlet for the perforated blowing tube. The horizontal center spacing of the micropores is 35mm, the vertical center spacing of the micropores is 25mm, the diameter of the micropores is 15mm, the horizontal micropores and the vertical micropores are arranged at intervals, and the horizontal center spacing of the horizontal micropores and the vertical micropores is 17.5mm. The microporous stainless steel screen (9) is spliced ​​and combined according to the designed pool size, water flow size, and biofilm suspended filler size to achieve the function of intercepting and discharging biofilm suspended fillers in pools of different sizes.

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