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AOA (Angles-Of-Arrival) continuous flow biological nitrogen and phosphorus removal process for sewage treatment

A biological denitrification and sewage treatment technology, applied in the field of sewage treatment process, can solve the problems of large amount of carbon source input, high energy consumption in operation, low efficiency of simultaneous denitrification and phosphorus removal, etc., to achieve improved utilization efficiency and low energy consumption , the effect of saving dosage

Active Publication Date: 2011-06-08
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low synchronous denitrification and phosphorus removal efficiency in existing sewage treatment, high energy consumption in operation, and large dosage of carbon source, and to provide an AOA continuous flow biological denitrification and denitrification method for sewage treatment. Phosphorus process

Method used

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  • AOA (Angles-Of-Arrival) continuous flow biological nitrogen and phosphorus removal process for sewage treatment

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine figure 1 As shown, the AOA continuous flow biological denitrification and dephosphorization process used for sewage treatment in this embodiment is carried out in the following steps: 1. The effluent from the primary sedimentation tank is divided into two parts through the water distribution well, and enters the anaerobic tank 4 and the aerobic tank 7 respectively, At the same time, the sludge from the secondary sedimentation tank flows back to the beginning of the anaerobic tank 4 through the sludge return pump 10 to form a mud-water mixture; 2. The mud-water mixture enters the aerobic tank 7 from the anaerobic tank 4 according to the push flow method, and then enters the anoxic tank 8. Enter the secondary settling tank 11 after mixed reaction, carry out sedimentation and drainage, and complete AOA continuous flow biological denitrification and phosphorus removal;

[0017] Wherein in step 1, the effluent of the primary sediment...

specific Embodiment approach 2

[0023] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the aerobic tank 7 is provided with a microporous aeration head for aeration, so that the mixed liquid fluctuates up and down and mixes evenly, and the dissolved oxygen concentration is 1.5 mg / L. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the anaerobic pool 4, the aerobic pool 7, and the anoxic pool 8 in the step 2 are all provided with partition wall classification, so that it forms a plug-flow treatment form, collectively referred to as the reaction Zone, in which the anaerobic pool 4, aerobic pool 7, and anoxic pool 8 are separated by 4, 7, and 4 respectively, the volume ratio is 3:4:5, the total hydraulic retention time of the reaction area is 8h, and the temperature of the reaction area is 25~27℃. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to an AOA (Angles-Of-Arrival) continuous flow biological nitrogen and phosphorus removal process for sewage treatment, relating to a sewage treatment process and solving the problems of low efficiency, great operation energy consumption and great carbon source dosage of synchronous nitrogen and phosphorus removal existing in traditional sewage treatment. The process comprises the following steps that: (1) the yielding water of a primary sedimentation tank respectively enters an anaerobic tank and an aerobic tank and the mud of a secondary sedimentation tank is refluxed to the initial end of the anaerobic tank to form a muddy water mixture; and (2) the muddy water mixture enters the aerobic tank from the anaerobic tank in a flow-pushing mode, then enters an anoxic tank and finally enters the secondary sedimentation tank to precipitate and drain. The process provided by the invention comprises the series connection of anaerobism, aerobism and anaerobism, original intake shunted in two parts enters the anaerobic tank and the aerobic tank so that polyphosphate accumulating organisms accumulate a great amount of intracellular polymers by utilizing carbon source in the original intake, the exogenous denitrification and denitrification phosphorus removal of inner carbon sources can be realized in the subsequent anoxic tank, and the synchronous nitrogen and phosphorus removal efficiency is improved. The process does not adopt a digestive juice reflux unit, has lower operation energy consumption than a traditional process and saves the carbon source dosage.

Description

technical field [0001] The invention relates to a sewage treatment process. Background technique [0002] A 2 The / O (anaerobic-anoxic-aerobic) process has a series of advantages such as simple structure, short total hydraulic retention time, mature design and operation experience, low control complexity, and is not easy to produce sludge bulking. It is one of the priority processes in the design of sewage plants. This process is also one of the most widely used simultaneous denitrification and phosphorus removal processes in urban sewage treatment plants in my country. It is foreseeable that before there is no better biological denitrification and phosphorus removal process, the country will still use A 2 / O process principle to design and build urban sewage treatment plants of various scales; the disadvantage is that there is a digestate reflux system that consumes a lot of energy in operation. [0003] A 2 The principle of biological nitrogen and phosphorus removal in ...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 彭永臻吴昌永王淑莹王然登李晓玲
Owner HARBIN INST OF TECH
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