An efficient denitrification sewage treatment device based on A2O

Abstract

This utility model discloses a high-efficiency denitrification wastewater treatment device based on A2O. The internal space of the tank is divided into an equipment room, an influent tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, and a filtration tank by a partition. The sedimentation tank is equipped with a sludge return device and is connected to the anaerobic tank through the sludge return device. A plug flow zone is located in the middle of the anoxic tank, and an air-lift plug flow device is installed in the plug flow zone, dividing the anoxic tank into a first anoxic section and a second anoxic section. A drainage hole is provided on the partition between the aerobic tank and the sedimentation tank. A return hole is opened on the partition near the anoxic tank at the output end of the aerobic tank, and the output end of the aerobic tank is connected to the first anoxic section through the return hole. The area of ​​the return hole is larger than the area of ​​the drainage hole. This utility model can reduce the impact of wastewater influent load, improve wastewater treatment capacity, and reduce energy consumption.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment, specifically relating to a method based on A 2 O-type high-efficiency denitrification wastewater treatment device. Background Technology

[0002] A 2 Biological nitrogen and phosphorus removal process is a commonly used wastewater treatment process in the traditional activated sludge method, which has the function of simultaneous nitrogen and phosphorus removal. 2 The O-type biological nitrogen and phosphorus removal process effectively removes various pollutants from wastewater, including organic matter, nitrogen, and phosphorus, through the synergistic action of anaerobic, anoxic, and aerobic stages. This process holds a significant position in wastewater treatment. However, it currently suffers from the following drawbacks: Due to the limitations of its operational characteristics, the designed biological retention time needs to be at least 18 hours to meet discharge requirements. If a shorter retention time is desired, fixed or suspended biological packing materials need to be added to the tanks, increasing both investment and operating costs, and the retention time still needs to be at least 12 hours. It also has poor resistance to shock loads. The quality and quantity of ordinary domestic sewage discharge fluctuate, and when both reach peak levels, the impact on the biological treatment load is excessive, easily leading to substandard effluent after biological treatment. Furthermore, to maintain the biological sludge in the anaerobic and anoxic tanks in a suspended state, agitation is required. Submersible mixers are typically used to maintain the anaerobic environment in the anaerobic tanks and the anoxic environment in the anoxic tanks, increasing initial investment, maintenance costs, and operating power consumption. Therefore, to avoid the shortcomings of the existing technology, it is necessary to improve it. Utility Model Content

[0003] The purpose of this utility model is to provide a method based on A 2 The O-type high-efficiency denitrification wastewater treatment device can reduce the impact of wastewater influent load, improve wastewater treatment capacity, and reduce energy consumption.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A type based on A 2 The high-efficiency nitrogen removal wastewater treatment device based on A 2The high-efficiency denitrification wastewater treatment device is a rectangular box structure. The internal space of the box is divided by partitions into an equipment room, an inlet tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, and a filtration tank. The equipment room is located at the front of the box. The inlet tank, anaerobic tank, and anoxic tank are arranged in a row away from the equipment room, forming a first water treatment path. The aerobic tank, sedimentation tank, and filtration tank are arranged in a row towards the equipment room, forming a second water treatment path. The first and second water treatment paths are arranged side-by-side. The inlet pipe network of the equipment room, the inlet tank, the anaerobic tank, the anoxic tank, the aerobic tank, the sedimentation tank, and the filtration tank are all connected. The effluent pipe network between the filtration tank and the equipment is connected in sequence; the output end of the filtration tank is connected to the equipment. A sludge return device is installed in the sedimentation tank, which is connected to the anaerobic tank via the sludge return device. A plug flow zone is provided in the middle of the anoxic tank, and an air-lift plug flow device is installed in the plug flow zone. The plug flow zone divides the anoxic tank into a first anoxic section and a second anoxic section. A drainage hole is provided on the partition between the aerobic tank and the sedimentation tank. A return hole is opened on the partition near the anoxic tank at the output end of the aerobic tank. The output end of the aerobic tank is connected to the first anoxic section via the return hole. The area of ​​the return hole is larger than the area of ​​the drainage hole.

[0006] As mentioned above, based on A 2 A preferred embodiment of the high-efficiency denitrification wastewater treatment device for O includes an air-lift propulsion device with an interconnected main air inlet pipe and a propulsion branch pipe. The main air inlet pipe is vertically arranged and connected to a blower, and the propulsion branch pipe has upward-facing propulsion holes.

[0007] As mentioned above, based on A 2 In a preferred embodiment of the high-efficiency denitrification wastewater treatment device for O, the return hole is located at the upper part near the aerobic tank, the bottom of the first anoxic section near the plug flow zone is provided with a first water passage hole for communicating with the plug flow zone, and the upper part of the plug flow zone near the second anoxic section is provided with an overflow hole for communicating with the second anoxic section.

[0008] As mentioned above, based on A 2 In a preferred embodiment of the high-efficiency denitrification wastewater treatment device, a second water passage hole is provided at the bottom of the partition between the inlet tank and the anaerobic tank, a third water passage hole is provided at the top of the partition between the anaerobic tank and the anoxic tank, and a fourth water passage hole is provided at the bottom of the partition between the second anoxic section and the aerobic tank.

[0009] As mentioned above, based on A 2In a preferred embodiment of a high-efficiency denitrification wastewater treatment device for O, an aeration device for oxygen supply is provided at the bottom of the aerobic tank.

[0010] As mentioned above, based on A 2 In a preferred embodiment of the high-efficiency denitrification wastewater treatment device, the reflux rate from the aerobic tank to the anoxic tank through the reflux hole can reach 30 to 40 times the influent flow rate of the anoxic tank.

[0011] As mentioned above, based on A 2 A preferred embodiment of a high-efficiency denitrification wastewater treatment device for O, wherein the sedimentation tank comprises several interconnected sedimentation sub-tanks.

[0012] As mentioned above, based on A 2 A preferred embodiment of a high-efficiency denitrification wastewater treatment device for O, wherein the filter tank is equipped with filter media.

[0013] The present invention provides a method based on A 2 The high-efficiency nitrogen removal wastewater treatment device of O has the following advantages compared with existing technologies:

[0014] This invention features an aerobic tank positioned to the side of the anoxic tank, creating a U-shaped pathway for the inlet tank, anaerobic tank, anoxic tank, aerobic tank, and sedimentation tank. Wastewater enters from the inlet tank and sequentially passes through the anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, and filtration tank for final treatment, thus completing the process based on A... 2The high-efficiency denitrification wastewater treatment device discharges wastewater from the filtration tank. Because the influent tank, anaerobic tank, anoxic tank, aerobic tank, and sedimentation tank form a U-shaped route, the sedimentation tank can be located on the side of the anaerobic tank. Therefore, a sludge return device is installed in the sedimentation tank, which is connected to the anaerobic tank. The sludge return device returns the sludge from the sedimentation tank to the anaerobic tank for phosphorus release and to maintain the sludge concentration in the biological zone, improving sludge utilization efficiency and preventing excessive sludge accumulation in the sedimentation tank. A plug flow zone is set between the output end of the anoxic tank and the input end of the aerobic tank. An air-lift plug flow device is installed in the plug flow zone. This device pushes the wastewater about to enter the aerobic tank, increasing the flow velocity and strengthening the hydraulic propulsion effect, keeping the biological sludge in a suspended state. This reduces the required intensity of mechanical stirring, lowering construction investment and operation and maintenance costs. Furthermore, the air-lift plug flow device improves the flow rate of the wastewater in the aerobic tank. The flow rate, combined with the return orifice, increases the return flow rate and ratio, allowing the mixed liquor at the end of the aerobic tank to be returned to the anoxic section. This increased return flow rate ensures thorough mixing of the returned sludge-water mixture with the high-concentration influent in the anoxic tank, reducing the impact of the wastewater influent load and improving treatment capacity. The return orifice is located at the output end of the aerobic tank, near the anoxic tank. A large proportion of the low-concentration nitrified liquor from the end of the aerobic tank is returned to the anoxic tank, where it mixes thoroughly with the influent, reducing the concentration of the mixed liquor at the front end of the anoxic tank. This keeps the microorganisms in the biological tank in the endogenous respiration stage, reducing the production of excess sludge and maintaining a micro-aerobic environment throughout the biological tank, thus reducing energy consumption. Furthermore, the low dissolved oxygen concentration at the end of the aerobic tank means that the nitrified liquor returned to the anoxic tank will not disrupt the anoxic environment, providing an excellent external environment for denitrification and improving the total nitrogen removal rate. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0016] Figure 1 This is a top-view schematic diagram of the water flow direction of this utility model;

[0017] Figure 2 This is a schematic diagram of the equipment distribution of this utility model;

[0018] Figure 3 This is a top view schematic diagram of the airlift propulsion device of this utility model;

[0019] Figure 4 This is a side view of the airlift propulsion device of this utility model;

[0020] Figure 5 This is a side view of the water flow in the inlet pool, anaerobic pool, anoxic pool and plug flow zone of this utility model;

[0021] Figure 6This is a side view of the water flow in the aerobic tank, sedimentation tank, and filtration tank of this utility model.

[0022] Marked in the image:

[0023] 100. Equipment Room; 200. Inlet Pool; 210. Second Water Passage Hole; 300. Anaerobic Pool; 310. Third Water Passage Hole; 400. Anoxic Pool; 410. First Anoxic Section; 420. Second Anoxic Section; 430. Fourth Water Passage Hole; 440. First Water Passage Hole; 500. Flow Stream Zone; 510. Air Lift Flow Stream Device; 511. Main Air Inlet Pipe; 512. Flow Stream Branch Pipe; 513. Flow Stream Hole; 520. Overflow Hole; 600. Aerobic Pool; 610. Return Hole; 620. Drainage Hole; 630. Aeration Device; 700. Sedimentation Pool; 710. Sedimentation Sub-pool; 720. Sludge Return Device; 800. Filter Pool; 810. Filter Media; 900. Container. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] 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.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] 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.

[0028] Please refer to the following: Figures 1 to 6 The present invention provides an embodiment based on A. 2This article describes a high-efficiency denitrification wastewater treatment device for O.

[0029] like Figures 1 to 6 As shown, this utility model is based on A 2 The high-efficiency nitrogen removal wastewater treatment device based on A 2 The high-efficiency denitrification wastewater treatment device is a rectangular box 900. The internal space of the box 900 is divided by partitions into an equipment room 100, an inlet tank 200, an anaerobic tank 300, an anoxic tank 400, an aerobic tank 600, a sedimentation tank 700, and a filtration tank 800. The equipment room 100 is located at the front end of the box 900. The inlet tank 200, the anaerobic tank 300, and the anoxic tank 400 are arranged in a row away from the equipment room 100. The aerobic tank 600, the sedimentation tank 700, and the filtration tank 800 are arranged in a row towards the equipment room 100, forming a second water treatment path. The first and second water treatment paths are arranged side by side, with the inlet pipe network of the equipment room 100, the inlet tank 200, the anaerobic tank 300, the anoxic tank 400, the aerobic tank 600, the sedimentation tank 700, and the filtration tank... The effluent pipe network of the filter tank 800 is sequentially connected to the equipment room 100; the output end of the filter tank 800 is connected to the equipment room 100. A sludge return device 720 is installed in the sedimentation tank 700, and the sedimentation tank 700 is connected to the anaerobic tank 300 through the sludge return device 720. A plug flow zone 500 is provided in the middle of the anoxic tank 400, and an air-lift plug flow device 510 is installed in the plug flow zone 500. The plug flow zone 500 pushes the anaerobic tank 300... The aerobic tank 400 is divided into a first anoxic section 410 and a second anoxic section 420. A drainage hole 620 is provided on the partition between the aerobic tank 600 and the sedimentation tank 700. A return hole 610 is provided on the partition near the anoxic tank 400 at the output end of the aerobic tank 600. The output end of the aerobic tank 600 is connected to the first anoxic section 410 through the return hole 610. The area of ​​the return hole 610 is larger than the area of ​​the drainage hole 620.

[0030] The diameter of the return hole 610 is larger than that of the water passage between the aerobic tank 600 and the sedimentation tank 700. The larger diameter return hole 610, together with the air-lift propulsion device 510 installed in the propulsion zone 500, increases the return flow rate from the end of the aerobic tank 600 to the anoxic tank 400. By increasing the return flow rate of the nitrified liquid at the end of the aerobic tank 600, it mixes with the influent of the anoxic tank 400, greatly reducing the influent concentration of the anoxic tank 400, improving the device's resistance to shock loads from the influent, improving the pollutant removal efficiency, and ensuring the stability of the effluent.

[0031] Increasing the nitrification liquor return flow rate can maintain a higher hydraulic loading and cross-sectional velocity in the anoxic tank (400 mL) and aerobic tank (600 mL), ensuring that the activated sludge remains in suspension and fully contacts the wastewater. Compared to conventional A... 2 Compared to the O process, the elimination of the need for a submersible jet mixer in the anoxic tank (400m) for thorough mixing of wastewater and sludge not only reduces operating power consumption but also decreases the initial investment and maintenance costs of supporting equipment. Furthermore, increasing the return flow rate extends the residence time of biological sludge in the treatment facility, maintaining a high concentration of activated sludge. This effectively controls the drawbacks of reduced microbial activity and decreased organic matter removal efficiency caused by low water temperatures in northern winters, thus ensuring reliable and stable effluent compliance.

[0032] Specifically, the dissolved oxygen at the end of the aerobic tank (600m³) was between 0.5 mg / L and 0.6 mg / L, which is higher than that of conventional A... 2 The O-type biological aerobic tank (600) needs to maintain dissolved oxygen between 2-4 mg / L, saving approximately 25% of aeration volume, significantly reducing blower operating energy consumption, and increasing return flow. This not only lowers the influent concentration but also improves the treatment unit's ability to withstand the impact load of high-concentration influent, ensuring stable effluent compliance. Meanwhile, conventional A... 2 The O process uses a water pump for reflux, which increases investment, equipment operating costs, and the risk of reflux pump failure. This unit uses an air-lift propulsion device 510, which not only saves operating costs but also reduces maintenance costs for electromechanical equipment.

[0033] For example, the airlift propulsion device 510 is provided with an air inlet main pipe 511 and a propulsion branch pipe 512 that are interconnected. The air inlet main pipe 511 is vertically arranged and connected to a blower. The propulsion branch pipe 512 is provided with an upward-facing propulsion hole 513. The airlift propulsion device 510 increases the solution flow rate of the second anoxic section 420 of the anoxic tank 400 and the aerobic tank 600, keeping the biological sludge in the anoxic tank 400 in a suspended state.

[0034] For example, the return hole 610 is located at the upper part near the aerobic tank 600. The bottom of the first anoxic section 410 near the side of the push flow zone 500 is provided with a first water passage hole 440 for communicating with the push flow zone 500. The upper part of the push flow zone 500 near the side of the second anoxic section 420 is provided with an overflow hole 520 for communicating with the second anoxic section 420. The return hole 610 is located at the upper part so that the nitrified liquid at the end of the aerobic tank 600 can return to the first anoxic section 410 through the liquid level difference. The first water passage hole 440 is located at the bottom of the first anoxic section 410 so that the water in the anoxic tank 400 enters the push flow zone 500 from the bottom of the push flow zone 500, which facilitates the upward push flow of the airlift push flow device 510.

[0035] Specifically, a liquid level difference of more than 20 cm is formed between the overflow hole 520 in the push flow zone 500 and the liquid surface in the second anoxic zone 420, which drives the sewage to form a large-flow internal reciprocating circulation between the anoxic tank 400 and the aerobic tank 600. A large amount of sewage circulates in the first anoxic zone 410, the push flow zone 500, the second anoxic zone 420 and the aerobic tank 600.

[0036] For example, a second water passage hole 210 is provided at the bottom of the partition between the inlet pool 200 and the anaerobic pool 300, a third water passage hole 310 is provided at the top of the partition between the anaerobic pool 300 and the anoxic pool 400, and a fourth water passage hole 430 is provided at the bottom of the partition between the second anoxic section 420 and the aerobic pool 600. The second water passage hole 210 and the third water passage hole 310 are respectively provided at the top and bottom, so that the water in the anaerobic pool 300 can travel a long distance to fully react before being output to the anoxic pool 400.

[0037] For example, the bottom of the aerobic tank 600 is provided with an aeration device 630 for oxygen supply. Microorganisms need to consume a large amount of dissolved oxygen and organic matter. The aeration device 630 can supply oxygen, maintain the rapid growth of microorganisms, control the dissolved oxygen content in the tank, and thus maintain a high-efficiency biological removal effect.

[0038] For example, the return flow rate from the aerobic tank 600 to the anoxic tank 400 through the return hole 610 can reach 30 to 40 times the influent flow rate of the anoxic tank 400. By fully mixing the ultra-large return mud-water mixture with the high-concentration influent, the impact of the influent load on the sewage is reduced, the treatment capacity is improved, and the treatment scale can be increased by about 30%-50% compared with the conventional A2 / O process.

[0039] For example, the sedimentation tank 700 includes several interconnected sedimentation sub-tanks 710, each sedimentation sub-tank 710 is equipped with the sludge return device 720, and each sludge return device 720 is connected to the input end of the anaerobic tank 300 through a pipeline. Multiple sedimentation sub-tanks 710 perform multi-stage sedimentation to improve the sewage purification effect.

[0040] For example, the filter tank 800 is provided with filter media 810, which can effectively reduce the turbidity of the water.

[0041] The present invention provides a method based on A 2 The high-efficiency nitrogen removal wastewater treatment device of O has the following advantages compared with existing technologies:

[0042] The aerobic tank 600 of this invention is located on the side of the anoxic tank 400, forming a U-shaped route with the inlet tank 200, anaerobic tank 300, anoxic tank 400, aerobic tank 600, and sedimentation tank 700. Wastewater enters from the inlet tank 200 and sequentially passes through the anaerobic tank 300, anoxic tank 400, aerobic tank 600, sedimentation tank 700, and filtration tank 800 for final treatment, thus completing the process based on A... 2 The wastewater from the high-efficiency denitrification wastewater treatment device discharges from the output end of the filter tank 800. Since the influent tank 200, anaerobic tank 300, anoxic tank 400, aerobic tank 600, and sedimentation tank 700 form a U-shaped route, the sedimentation tank 700 can be located on the side of the anaerobic tank 300. Therefore, a sludge return device 720 is installed in the sedimentation tank 700 and can communicate with the anaerobic tank 300. The sludge return device 720 returns the sludge from the sedimentation tank 700 to the anaerobic tank 300 for phosphorus release and to maintain the sludge concentration in the biological zone. To improve sludge utilization efficiency and prevent excessive sludge accumulation in the sedimentation tank 700, a flow-propelling zone 500 is set between the output end of the anoxic tank 400 and the input end of the aerobic tank 600. An air-lift flow-propelling device 510 is installed in the flow-propelling zone 500 to propel the wastewater about to enter the aerobic tank 600, increasing the flow velocity and strengthening the hydraulic propulsion effect. This keeps the biological sludge in suspension, reducing the required mechanical stirring intensity, lowering construction investment and operation and maintenance costs. Furthermore, the air-lift flow-propelling device... The flow device 510 increases the wastewater flow velocity in the aerobic tank 600, which, in conjunction with the return flow hole 610, increases the return flow rate and the return ratio. This allows the mixed liquor at the end of the aerobic tank 600 to be returned to the anoxic section by increasing the return ratio. The increased return flow rate ensures thorough mixing of the returned sludge-water mixture with the high-concentration influent in the anoxic tank 400, reducing the impact of the influent load and improving treatment capacity. The return flow hole 610 is located at the output end of the aerobic tank 600, near the anoxic tank 400. The low-concentration nitrification liquor at the end of the aerobic tank 600... The nitrified liquid is proportionally returned to the anoxic tank 400, and after being fully mixed with the influent of the anoxic tank 400, the concentration of the mixed liquor at the front end of the anoxic tank 400 is reduced. This keeps the microorganisms in the biological tank in the endogenous respiration stage, reduces the production of excess sludge, maintains the entire biological tank in a micro-aerobic environment, and reduces energy consumption. Moreover, the dissolved oxygen concentration at the end of the aerobic tank 600 is low, so the nitrified liquid returned to the anoxic tank 400 will not disrupt the anoxic environment in the anoxic tank 400, providing an excellent external environment for the denitrification reaction and improving the total nitrogen removal rate.

[0043] Specifically, taking a domestic sewage treatment project as an example, the raw water is typical domestic sewage, with no industrial wastewater discharged. Conventional A... 2 O integration is based on A 2 The wastewater is treated by a high-efficiency denitrification wastewater treatment device. The treatment capacity is 200 m3 / d, and the process flow is: domestic sewage → bar screen → equalization tank → A 2O-integrated biological treatment device - external discharge.

[0044] The influent parameters for domestic sewage treatment projects are as follows:

[0045] name COD SS NH3-N TN TP index 350 180 35 40 5

[0046] Wastewater flows by gravity into the bar screen channel, where large suspended solids and floating debris are intercepted before entering the equalization tank for water quantity and quality regulation. Then, it is pumped into A... 2 The integrated biological treatment unit (O) first introduces raw water into the anaerobic zone, where it mixes with sludge returned from the sedimentation tank. Through the phosphorus-releasing action of anaerobic phosphorus-releasing bacteria, the phosphorus within the polyphosphate-accumulating bacteria is fully released, providing them with the energy needed for their reproduction and growth. After anaerobic treatment, the wastewater enters the anoxic zone, where it mixes thoroughly with nitrified liquid returned from the aerobic zone. Utilizing the denitrification action of denitrifying bacteria in the anoxic zone, nitrate nitrogen in the wastewater is fully denitrified to generate nitrogen gas, which is released into the air, achieving the effect of removing total nitrogen. Then, the wastewater enters the aerobic zone, where suspended packing material is filled. Utilizing the attached bacterial flocs and the metabolism of nitrifying bacteria, organic carbon in the wastewater is degraded, while ammonia nitrogen in the wastewater is nitrified into nitrate. Simultaneously, polyphosphate-accumulating bacteria in the aerobic zone fully accumulate phosphorus, transferring some of the phosphorus-containing substances in the wastewater to the biological sludge. Phosphorus removal agent is added at the front end of the sedimentation tank to further remove phosphorus through chemical means, ensuring that the pollutant indicators of the treated wastewater meet the Class A standard limit in the "Discharge Standard of Pollutants for Urban Wastewater Treatment Plants" (GB18918-2002) before being discharged.

[0047] The final effluent parameters are as follows:

[0048] name COD SS NH3-N TN TP index ≤50 ≤10 ≤5 ≤15 ≤0.5

[0049] A 2 The operating parameters of the integrated biological treatment unit are as follows:

[0050]

[0051]

[0052] In comparison of processing capacity, the process flow remains unchanged, except that the aerobic zone biological packing material is eliminated, and the biochemical section is changed from conventional A... 2 The O treatment facility was replaced with this unit. Under the same treatment capacity of 200 m³ / d, the influent parameters were compared as follows:

[0053] name COD SS NH3-N TN TP index 350 180 35 40 5

[0054] After being processed and stabilized by the device of this invention, the effluent water quality indicators are as follows:

[0055] name COD SS NH3-N TN TP index ≤30 ≤10 ≤1.5 ≤10 ≤0.3

[0056] The effluent water quality indicators basically met the Class IV water quality standard (except for total nitrogen) of the "Surface Water Environmental Quality Standard". The pollutant removal efficiency was significantly better than that of conventional A. 2 O processing system. Operating indicators are as follows:

[0057]

[0058]

[0059] Based on the above comparison, under the same treatment scale, the effluent standard of this patented technology is superior, and the operating power consumption is reduced by more than 30%.

[0060] To verify this based on A 2 The maximum treatment capacity of the high-efficiency denitrification wastewater treatment device is increased to 300 m³ / d. The air-lift push-flow return flow rate is gradually increased to 40 times the influent flow rate. After a period of operation and reaching stability, the effluent water quality indicators are as follows:

[0061] name COD SS NH3-N TN TP index ≤40 ≤10 ≤1.5 ≤12 ≤0.3

[0062] Based on the above test results, it is shown that the water output performance of the device of the present invention is significantly better than that of conventional A. 2 In the O biochemical system, except for a slight increase in total nitrogen, all other indicators remained largely unchanged. This proves that the results are based on A. 2 The high-efficiency denitrification wastewater treatment device for O can achieve the treatment capacity of conventional A 2 The power consumption is approximately 1.5 times that of the O treatment unit. Due to the increased treatment scale, the unit operating power consumption is reduced to 0.18 kWh / m³.

[0063] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An efficient denitrification sewage treatment device based on A2O, characterized in that, The high-efficiency nitrogen removal wastewater treatment device based on A2O is a rectangular box structure. The internal space of the box is divided into an equipment room, an inlet tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, and a filtration tank by partitions. The equipment room is located at the front end of the box. The inlet tank, the anaerobic tank, and the anoxic tank are arranged in a row away from the equipment room, forming a first water treatment path. The aerobic tank, the sedimentation tank, and the filtration tank are arranged in a row towards the equipment room, forming a second water treatment path. The first water treatment path and the second water treatment path are arranged side by side. The inlet pipe network of the equipment room, the inlet tank, the anaerobic tank, the anoxic tank, the aerobic tank, the sedimentation tank, the filtration tank, and the outlet pipe network of the equipment room are connected in sequence. The sedimentation tank is equipped with a sludge return device, and the sedimentation tank is connected to the anaerobic tank through the sludge return device. A flow-propelling zone is provided in the middle of the anoxic tank, and an air-lift flow-propelling device is provided in the flow-propelling zone. The flow-propelling zone divides the anoxic tank into a first anoxic section and a second anoxic section. A drainage hole is provided on the partition between the aerobic tank and the sedimentation tank. A return hole is opened on the partition near the anoxic tank at the output end of the aerobic tank. The output end of the aerobic tank is connected to the first anoxic section through the return hole. The area of ​​the return hole is larger than the area of ​​the drainage hole.

2. The A2O-based high-efficiency denitrification sewage treatment device according to claim 1, characterized in that, The air lift propulsion device is equipped with an air intake main pipe and a propulsion branch pipe that are interconnected. The air intake main pipe is vertically arranged and connected to a blower, and the propulsion branch pipe has an upward-facing propulsion hole.

3. The high-efficiency denitrification wastewater treatment device based on A2O according to claim 2, characterized in that, The return hole is located at the upper part near the aerobic tank. The bottom of the first anoxic section near the side of the push flow zone is provided with a first water passage hole for communicating with the push flow zone. The upper part of the push flow zone near the side of the second anoxic section is provided with an overflow hole for communicating with the second anoxic section.

4. The high-efficiency denitrification wastewater treatment device based on A2O according to claim 3, characterized in that, A second water passage hole is provided at the bottom of the partition between the inlet pool and the anaerobic pool, a third water passage hole is provided at the top of the partition between the anaerobic pool and the anoxic pool, and a fourth water passage hole is provided at the bottom of the partition between the second anoxic section and the aerobic pool.

5. The high-efficiency denitrification wastewater treatment device based on A₂O according to any one of claims 1 to 4, characterized in that, The bottom of the aerobic tank is equipped with an aeration device for supplying oxygen.

6. The high-efficiency denitrification wastewater treatment device based on A₂O according to any one of claims 1 to 4, characterized in that, The reflux rate from the aerobic tank to the anoxic tank through the reflux hole can reach 30 to 40 times the influent rate of the anoxic tank.

7. The high-efficiency denitrification wastewater treatment device based on A₂O according to any one of claims 1 to 4, characterized in that, The sedimentation tank includes several interconnected sedimentation sub-tanks.

8. The high-efficiency denitrification wastewater treatment device based on A₂O according to any one of claims 1 to 4, characterized in that, The filter tank is equipped with filter media.

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