Sewage treatment system and method through nitrogen and phosphorus removal constant water level sequencing batch activated sludge process

Abstract

The invention discloses a sewage treatment system and method through a nitrogen and phosphorus removal constant water level sequencing batch activated sludge process, and relates to sewage treatment. The sewage treatment system through the nitrogen and phosphorus removal constant water level sequencing batch activated sludge process comprises a sewage treatment pond, wherein through two hydraulic sails fixed at the bottom and two sidewalls of the sewage treatment pond in a sealed manner, the sewage treatment pond is divided into a biological selection zone, a reaction zone and a water discharging balance zone; a continuous water inlet, a first stirrer and a reaction zone water inlet pump are arranged in the biological selection zone; a water inlet pipe, a flow impeller, an aerating device, a water decanter, a dissolved oxygen online detector and a sludge pump are arranged in the reaction zone; and a second stirrer, a reaction zone water outlet pump and a continuous water outlet are arranged in the water discharging balance zone. Inside of the entire sewage treatment pond runs depending on time sequence cycles; in each cycle, water is continuously fed into the biological selection zone and is continuously discharged out of the water discharging balance zone; and in the reaction zone, water feeding, reaction, precipitation, water discharging, mud discharging and sludge return are sequentially implemented in different time periods of the cycles, and the process is repeated again and again.

Description

technical field [0001] The invention relates to sewage treatment, in particular to an efficient nitrogen and phosphorus removal constant water level sequence batch type activated sludge method for treating sewage system and its method. Background technique [0002] Based on European patent 1132248 and Chinese patent ZL200720009520.4, a constant water level sewage biological treatment process is disclosed. The sewage inflow is divided into three functional areas of variable volume by a reciprocating flexible water sail. The process and its system realize continuous water inflow and outflow in a single reaction tank, and periodically complete the entire process of water filling, stirring, aeration, sedimentation, and decanting in the SBR process (sequential batch activated sludge process). It is more suitable for the treatment of sewage in small and medium-sized cities and towns in my country. [0003] However, it was found during operation that if the TN and TP in the influen...

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Problems solved by technology

[0003] However, it was found during operation that if the TN and TP in the influent water are too high, and the effluent has high requirements for nitrogen and phosphorus removal, the treatment effect of the constant water level SBR system for nitrogen and phosphorus removal is not very satisfactory, and it is still necessary to strengthen its denitrification. Nitrogen and phosphorus removal capacity

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