A biological cell aeration system

Abstract

The utility model relates to sewage treatment technical field, concretely relates to a biological pool aeration system, including micro aeration fan and pulse aeration fan. Micro aeration fan is connected with aerobic micro aeration pipeline and aerobic micro aeration disc, and pulse aeration fan is connected with aerobic pulse aeration pipeline and aerobic pulse aeration disc. Aerobic micro aeration disc and aerobic pulse aeration disc are arranged at intervals. The communication pipeline is arranged between aerobic micro aeration pipeline and aerobic pulse aeration pipeline, and the fourth control valve is arranged on the communication pipeline. The third control valve is arranged on the aerobic pulse aeration pipeline in the front end of the communication pipeline. The venturi tube is arranged on the aerobic micro aeration pipeline in the front end of the communication pipeline, and the throat of the venturi tube is connected with the bottom of acid storage tank through the conveying pipeline. The utility model can realize micro aeration + pulse aeration of aerobic pool, which is helpful to energy saving and consumption reduction. The utility model can also realize the cleaning of aeration disc, which is helpful to the stable operation of the system.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a biological tank aeration system. Background Technology

[0002] Wastewater generated in production and daily life generally needs to be purified in sewage treatment plants to achieve water resource recycling. Urban domestic sewage is generally treated in municipal sewage treatment plants. Currently, biological methods are generally used to treat urban domestic sewage, that is, the removal of COD, nitrogen and phosphorus from sewage through the activity of microorganisms, thereby purifying the water quality.

[0003] Biological treatment is generally carried out in biological tanks, using the currently common A 2 Taking the O process as an example, the biological tank includes an anaerobic tank, an anoxic tank, and an aerobic tank. By controlling the oxygen content in the biological tank, ammonia nitrogen nitrification is achieved under aerobic conditions. The nitrogen is then denitrified under anoxic conditions by returning the nitrogen to the anoxic tank. Phosphorus is treated through anaerobic phosphorus release and aerobic phosphorus uptake, thereby achieving the biological treatment process of wastewater.

[0004] Traditionally, it is believed that controlling dissolved oxygen is particularly important during microbial activity. For anoxic tanks, the dissolved oxygen level should be controlled below 0.5 mg / L, while for aerobic tanks, it needs to be controlled above 3 mg / L to ensure the normal life activities of microorganisms and the effectiveness of wastewater treatment.

[0005] However, long-term research and practice have revealed that the current common practice of controlling the dissolved oxygen content in aerobic tanks is too high. The fact that the ammonia nitrogen content in the effluent of aerobic tanks can often be reduced to below 1 mg / L is strong evidence of this. Controlling the dissolved oxygen content in aerobic tanks too high increases the energy consumption of aeration in aerobic tanks and also increases the production of sludge, thus increasing the burden on downstream sludge treatment and disposal.

[0006] During the long-term research process, it was also found that by controlling the aerobic tank to a micro-aeration state and applying pulse aeration intermittently to increase the dissolved oxygen content, not only can the effluent quality be effectively guaranteed, but the energy consumption of aeration can also be effectively reduced. Therefore, this utility model proposes a biological tank aeration system to achieve micro-aeration and pulse aeration of the aerobic tank. In addition, during operation, it was found that due to the long-term low air flux state, the microporous aeration discs are prone to clogging, which is not conducive to the stable operation of the aeration system. Therefore, this utility model sets up an acid storage tank and uses organic acid to clean the aerators, thereby ensuring the stable operation of the system. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of the existing technology by providing a biological tank aeration system that achieves micro-aeration + pulse aeration in aerobic tanks, and ensures stable operation of the system under the conditions of micro-aeration + pulse aeration.

[0008] To achieve the above objectives, this utility model adopts the following technical solution: a biological tank aeration system, arranged based on the aerobic tank of the biological tank, including a micro-aeration blower and a pulse aeration blower. The micro-aeration blower is connected to the aerobic micro-aeration discs in the aerobic tank through an aerobic micro-aeration pipe, and the pulse aeration blower is connected to the aerobic pulse aeration discs in the aerobic tank through an aerobic pulse aeration pipe. The aerobic micro-aeration discs and the aerobic pulse aeration discs are arranged at intervals. A connecting pipe is provided between the aerobic micro-aeration pipe and the aerobic pulse aeration pipe, and a fourth control valve is provided on the connecting pipe. A third control valve is provided on the aerobic pulse aeration pipe at the front end of the connecting pipe.

[0009] Furthermore, a first control valve is installed on the aerobic micro-aeration pipe at the rear end of the connecting pipe.

[0010] Furthermore, a Venturi tube is installed on the aerobic micro-aeration pipe at the front end of the connecting pipe. The throat of the Venturi tube is connected to the bottom of the acid storage tank through a conveying pipe, and a fifth control valve is installed on the conveying pipe.

[0011] Furthermore, the arrangement is based on the anoxic tank of the biological pond. The aerobic micro-aeration pipe at the rear end of the Venturi tube and the front end of the connecting pipe is connected to the anoxic aeration pipe. The anoxic aeration pipe is connected to the anoxic aeration disc in the anoxic pond. A second control valve is installed on the anoxic aeration pipe.

[0012] Furthermore, a first flow indicator transmitter is installed on the aerobic micro-aeration pipeline downstream of the first control valve, a second flow indicator transmitter is installed on the anoxic aeration pipeline downstream of the second control valve, a third flow indicator transmitter is installed on the aerobic pulse aeration pipeline downstream of the connecting pipeline, and a fourth flow indicator transmitter is installed on the delivery pipeline downstream of the fifth control valve.

[0013] Furthermore, both the aerobic and anoxic tanks are equipped with DO electrodes, each of which is connected to a local PLC; each flow indicator transmitter is connected to a local PLC; the local PLC is connected to each control valve; and the local PLC is connected to each blower.

[0014] The beneficial effects of this utility model are: 1. This utility model can realize micro-aeration and pulse aeration in aerobic tanks. During the process, it can not only ensure the quality of effluent, but also effectively reduce the energy consumption of aeration, which helps to save energy and reduce emissions, and reduce the cost of sewage treatment. 2. This utility model can clean the aeration discs in the aerobic tank, avoiding the easy clogging of the aeration discs when operating under micro-aeration conditions, and plays a positive role in ensuring the stable operation of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall installation layout of this utility model.

[0016] The names corresponding to each mark in the diagram: 1. Anoxic tank; 11. Anoxic aeration disc; 2. Aerobic tank; 21. Aerobic micro-aeration disc; 22. Aerobic pulse aeration disc; 3. Micro-aeration blower; 4. Pulse aeration blower; 5. Aerobic micro-aeration pipeline; 51. First control valve; 52. First flow indicator transmitter; 53. Venturi tube; 6. Anoxic aeration pipeline; 61. Second control valve; 62. Second flow indicator transmitter; 7. Aerobic pulse aeration pipeline; 71. Third control valve; 72. Third flow indicator transmitter; 8. Connecting pipeline; 81. Fourth control valve; 9. Acid storage tank; 91. Delivery pipeline; 911. Fifth control valve; 912. Fourth flow indicator transmitter. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0018] Embodiments of this utility model: like Figure 1 As shown, this utility model is attached to the biological tank of a sewage treatment plant and arranged therein, wherein the biological tank includes an anoxic tank 1 and an aerobic tank 2; an anoxic aeration disc 11 is arranged in the anoxic tank 1, and an aerobic micro-aeration disc 21 and an aerobic pulse aeration disc 22 are arranged in the aerobic tank 2, wherein the aerobic micro-aeration disc 21 and the aerobic pulse aeration disc 22 are arranged alternately.

[0019] In this embodiment, a micro-aeration blower 3 and a pulse aeration blower 4 are provided. The micro-aeration blower 3 is connected to an aerobic micro-aeration pipeline 5, and the aerobic micro-aeration pipeline 5 is connected to an aerobic micro-aeration disc 21 in the aerobic tank 2 through various branch pipes.

[0020] The aerobic micro-aeration pipeline 5 is connected to the anoxic aeration pipeline 6. The anoxic aeration pipeline 6 is connected to the anoxic aeration disc 11 through various branch pipes. A second control valve 61 is installed on the anoxic aeration pipeline 6, and a second flow indicator transmitter 62 is installed at the rear end of the second control valve 61.

[0021] The aerobic micro-aeration pipe 5 at the rear end of the anoxic aeration pipe 6 is connected to the connecting pipe 8. A fourth control valve 81 is installed on the connecting pipe 8. The connecting pipe 8 is connected to the aerobic pulse aeration pipe 7. The front end of the aerobic pulse aeration pipe 7 is connected to the pulse aeration blower 4. A third control valve 71 is installed on the aerobic pulse aeration pipe 7 at the front end of the connecting pipe 8. A third flow indicator transmitter 72 is installed on the aerobic pulse aeration pipe 7 at the rear end of the connecting pipe 8. The aerobic pulse aeration pipe 7 is connected to the aerobic pulse aeration disc 22 in the aerobic tank 2 through various branch pipes.

[0022] A first control valve 51 is installed on the aerobic micro-aeration pipeline 5 at the rear end of the connecting pipeline 8, and a first flow indicator transmitter 52 is installed at the rear end of the first control valve 51.

[0023] A Venturi tube 53 is installed on the aerobic micro-aeration pipe 5 at the front end of the anoxic aeration pipe 6. The throat of the Venturi tube 53 is connected to the bottom of the acid storage tank 9 through the conveying pipe 91. A fifth control valve 911 is installed on the conveying pipe 91, and a fourth flow indicator transmitter 912 is installed at the rear end of the fifth control valve 911.

[0024] DO electrodes are installed in both the anoxic tank 1 and the aerobic tank 2. Multiple DO electrodes can be installed in each tank. Each DO electrode is connected to a local PLC (the average value of the detection data is transmitted to the local PLC). Each flow display and transmitter is connected to the local PLC. The local PLC is connected to each control valve, which is an electric valve. The local PLC is also connected to each blower. The micro-aeration blower 3 and the pulse aeration blower 4 are variable frequency blowers.

[0025] The principle of this utility model is as follows: This invention enables micro-aeration and pulse aeration of the aerobic tank 2 during use. Through micro-aeration and pulse aeration, the aerobic needs of microorganisms can be met, and the effluent water quality can be guaranteed to meet the standards, thereby reducing energy consumption and achieving energy conservation and emission reduction.

[0026] Specifically, this invention uses a micro-aeration blower 3, which aerates the anoxic tank 1 through the anoxic aeration pipe 6. During the process, the dissolved oxygen concentration is monitored by the DO electrode in the anoxic tank 1, and the monitoring data is transmitted to the on-site PLC. The on-site PLC controls the opening of the second control valve 61 to control the air delivery volume, thereby regulating the dissolved oxygen content in the anoxic tank 1. The dissolved oxygen content in the anoxic tank 1 is controlled at 0.2~0.5 mg / L. In addition, if the dissolved oxygen content is still lower than the control content when the second valve is 100% open, the power of the micro-aeration blower 3 can be appropriately increased. If the dissolved oxygen content is still higher than the control content when the second valve is 20% open, the power of the micro-aeration blower 3 can be appropriately reduced.

[0027] In addition, the micro-aeration blower 3 also provides micro-aeration to the aerobic tank 2 through the aerobic micro-aeration pipeline 5 and the aerobic pulse aeration pipeline 7. During the process, the pulse aeration blower 4 is turned off, the third control valve 71 is closed, and the fourth control valve 81 on the connecting pipeline 8 is opened; air enters the aerobic tank 2 through the micro-aeration blower 3, the aerobic micro-aeration pipeline 5, and the aerobic pulse aeration pipeline 7 respectively; the DO motor in the aerobic tank 2 monitors the dissolved oxygen concentration and transmits the monitoring data to the on-site PLC, which controls the first control valve 51 and the fourth control valve 81. The opening degree of the four control valves 81 ensures that the air flow in the aerobic micro-aeration pipeline 5 and the aerobic pulse aeration pipeline 7 is basically the same, and that the dissolved oxygen content in the aerobic tank 2 is between 0.5 and 1 mg / L. In addition, if the dissolved oxygen content is still lower than the control content when the opening degree of the first valve or the fourth valve reaches 100%, the power of the micro-aeration blower 3 can be appropriately increased. If the opening degree of the first valve or the fourth valve is small, such as 20%, and the dissolved oxygen content is still higher than the control content, the power of the micro-aeration blower 3 can be appropriately reduced.

[0028] During the operation of aerobic tank 2, micro-aeration and pulse aeration are operated alternately, such as starting pulse aeration once every 2 to 3 days, and each pulse aeration run for 12 to 24 hours.

[0029] During the process, the pulse aeration blower 4 is started, the third control valve 71 is opened and the fourth control valve 81 is closed. Air then enters the aerobic tank 2 through the pulse aeration blower 4 and the aerobic pulse aeration pipeline 7. During the process, the air flow rate in the aerobic micro-aeration pipeline 5 is kept basically constant, and the opening degree of the third control valve 71 or the power of the pulse aeration blower 4 is controlled to keep the dissolved oxygen content in the aerobic tank 2 at 2~3 mg / L. After the pulse aeration ends, the on-site PLC switches the aerobic tank 2 to the micro-aeration state described above.

[0030] Since the aeration air flow rates in both the anoxic tank 1 and the aerobic tank 2 are low, the aeration discs are easily clogged by biofilms. Therefore, a Venturi tube 53 is installed on the anoxic aeration pipe 6. The negative pressure at the throat of the Venturi tube 53 draws the formic acid from the formic acid storage tank 9 into the anoxic aeration pipe 6, where it is atomized under the impact of the airflow and then transported to each aeration disc, thereby destroying the biofilm and effectively preventing the aeration discs from clogging. During the process, the fifth control valve 911 can be opened during the micro-aeration stage of the aerobic tank 2 to control the flow rate and operating time.

[0031] This invention involves simple on-site PLC control, which is easy for those skilled in the art to understand, and will not be described in detail here.

Claims

1. A biological pond aeration system, arranged based on the aerobic tank (2) of the biological pond, characterized in that: The system includes a micro-aeration blower (3) and a pulse aeration blower (4). The micro-aeration blower (3) is connected to the aerobic micro-aeration disc (21) in the aerobic tank (2) through the aerobic micro-aeration pipe (5). The pulse aeration blower (4) is connected to the aerobic pulse aeration disc (22) in the aerobic tank (2) through the aerobic pulse aeration pipe (7). The aerobic micro-aeration disc (21) and the aerobic pulse aeration disc (22) are arranged at intervals. A connecting pipe (8) is provided between the aerobic micro-aeration pipe (5) and the aerobic pulse aeration pipe (7). A fourth control valve (81) is provided on the connecting pipe (8). A third control valve (71) is provided on the aerobic pulse aeration pipe (7) at the front end of the connecting pipe (8).

2. The biological tank aeration system according to claim 1, characterized in that: A first control valve (51) is installed on the aerobic micro-aeration pipe (5) at the rear end of the connecting pipe (8).

3. The biological tank aeration system according to claim 2, characterized in that: A venturi tube (53) is installed on the aerobic micro-aeration pipe (5) at the front end of the connecting pipe (8). The throat of the venturi tube (53) is connected to the bottom of the acid storage tank (9) through a conveying pipe (91). A fifth control valve (911) is installed on the conveying pipe (91).

4. The biological tank aeration system according to claim 3, characterized in that: It is also arranged based on the anoxic tank (1) of the biological pond. The aerobic micro-aeration pipe (5) at the rear end of the Venturi tube (53) and the front end of the connecting pipe (8) is connected to the anoxic aeration pipe (6). The anoxic aeration pipe (6) is connected to the anoxic aeration disc (11) in the anoxic tank (1). A second control valve (61) is installed on the anoxic aeration pipe (6).

5. The biological tank aeration system according to claim 4, characterized in that: A first flow indicator transmitter (52) is installed on the aerobic micro-aeration pipeline (5) at the rear end of the first control valve (51), a second flow indicator transmitter (62) is installed on the anoxic aeration pipeline (6) at the rear end of the second control valve (61), a third flow indicator transmitter (72) is installed on the aerobic pulse aeration pipeline (7) at the rear end of the connecting pipeline (8), and a fourth flow indicator transmitter (912) is installed on the conveying pipeline (91) at the rear end of the fifth control valve (911).

6. The biological tank aeration system according to claim 5, characterized in that: Both the aerobic tank (2) and the anoxic tank (1) are equipped with DO electrodes, and each DO electrode is connected to a local PLC. Each flow indicator transmitter is connected to a local PLC. The local PLC is connected to each control valve. The local PLC is connected to each blower.

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