A2/O-MBR-biological contact oxidation pond dual-sludge high-efficiency denitrifying phosphorus removal device and method

Abstract

The invention relates to an A2 / O-MBR-biological contact oxidation pond dual-sludge high-efficiency denitrifying phosphorus removal device and method and belongs to the field of active sludge sewage treatment. The device mainly consists of a water tank (1), an A2 / O (3), a membrane biological reactor (9) and a biological contact oxidation pond (7) which are sequentially connected; the method is characterized in that, according to a contradiction existing in sludge age between nitrifying bacteria and phosphorus-accumulating bacteria, on one hand, the nitrifying bacteria with a longer sludge age are elutriated out of an A2 / O system by shortening the sludge age of the A2 / O; on the other hand, the nitrifying bacteria grow on biological fillers in the biological contact oxidation pond in the form of biological membranes, nitrifying reaction is fully performed, electron acceptors in the anoxic zone of the A2 / O are guaranteed to be sufficient, and necessary conditions are provided for denitrifying phosphorus removal. In addition, the A2 / O and the biological contact oxidation pond are connected through the membrane biological reactor (MBR), and a very good dual-sludge system environment is guaranteed. The A2 / O-MBR-biological contact oxidation pond dual-sludge high-efficiency denitrifying phosphorus removal device and method are applicable to low-carbon-to-nitrogen-ratio urban sewage treatment, the process is advanced, the outlet water quality is stable and the advantages of energy saving and consumption reduction are remarkable.

Description

technical field

[0001] The invention relates to a denitrification dephosphorization device and method, which belong to the technical field of sewage treatment by activated sludge method, and are applicable to the technical field of sewage treatment such as upgrading of new sewage plants and old sewage plants, treatment of municipal sewage and industrial waste water, and the like. Background technique

[0002] my country's urban sewage has a low C / N ratio, and the easily degradable carbon sources that can be used for anaerobic phosphorus release and denitrification denitrification are even lower, posing a great challenge to sewage treatment. At present, many sewage treatment plants in my country cannot stably meet the first-level A discharge standards of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), especially the critical point is that the effluent TN, TP and SS cannot stably meet the standards.

[0003] Nitrification reaction requires...

Examples

Embodiment approach

[0021] 1) Start the system: Inoculate activated sludge from traditional sewage treatment plants with MLSS>8000mg / L, MLVSS / MLSS>0.65, SV2 In / O(3), the sludge concentration was set to 4000 mg / L.

[0022] 2) The domestic sewage enters A from the water tank (1) through the water inlet pump (2) 2 The anaerobic zone (4) of / O(3) also enters the return sludge from the bottom of the end of the aerobic zone (6) through the sludge return pump (14) to control the HRT 厌氧 For 2h, the anaerobic phosphorus release reaction is carried out in the anaerobic zone (4).

[0023] 2) The mixed solution enters the anoxic zone (5) from the anaerobic zone (4), and also enters the nitrification solution from the biological contact oxidation tank (7) at the same time to control the HRT 缺氧 For 4h, denitrification phosphorus absorption.

[0024] 3) The mixed solution enters the aerobic zone (6) from the anoxic zone (5) to control the HRT 好氧 For 0.5h, the aerobic phosphorus uptake reaction is carried ou...

technical field

[0001] The invention relates to a denitrification dephosphorization device and method, which belong to the technical field of sewage treatment by activated sludge method, and are applicable to the technical field of sewage treatment such as upgrading of new sewage plants and old sewage plants, treatment of municipal sewage and industrial waste water, and the like. Background technique

[0002] my country's urban sewage has a low C / N ratio, and the easily degradable carbon sources that can be used for anaerobic phosphorus release and denitrification denitrification are even lower, posing a great challenge to sewage treatment. At present, many sewage treatment plants in my country cannot stably meet the first-level A discharge standards of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), especially the critical point is that the effluent TN, TP and SS cannot stably meet the standards.

[0003] Nitrification reaction requires...

Examples

Embodiment approach

[0021] 1) Start the system: Inoculate activated sludge from traditional sewage treatment plants with MLSS>8000mg / L, MLVSS / MLSS>0.65, SV2 In / O(3), the sludge concentration was set to 4000 mg / L.

[0022] 2) The domestic sewage enters A from the water tank (1) through the water inlet pump (2) 2 The anaerobic zone (4) of / O(3) also enters the return sludge from the bottom of the end of the aerobic zone (6) through the sludge return pump (14) to control the HRT 厌氧 For 2h, the anaerobic phosphorus release reaction is carried out in the anaerobic zone (4).

[0023] 2) The mixed solution enters the anoxic zone (5) from the anaerobic zone (4), and also enters the nitrification solution from the biological contact oxidation tank (7) at the same time to control the HRT 缺氧 For 4h, denitrification phosphorus absorption.

[0024] 3) The mixed solution enters the aerobic zone (6) from the anoxic zone (5) to control the HRT 好氧 For 0.5h, the aerobic phosphorus uptake reaction is carried ou...

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