Device and method for processing aerobic biofilm bypass flow A2O (Anaeroxic-Anoxic-Oxic) process of low C/N (Carbon-Nitrogen) urban sewage

Abstract

The invention discloses a device and method for processing the aerobic biofilm bypass flow A2O (Anaeroxic-Anoxic-Oxic) process of low C/N (Carbon-Nitrogen) urban sewage, belonging to the field of sewage treatment. The method comprises the following steps of: enabling partial raw water and the returned sludge of a secondary sedimentation tank to together enter a pre-anoxic zone of an A2O reactor; removing nitric nitrogen in the refluxed sludge by denitrifying bacteria through denitrification; enabling the raw water to simultaneously enter an anaerobic zone of the A2O reactor, absorbing a great amount of biodegradable organic matter by poly-p bacteria in the anaerobic zone, storing in vivo in a PHAs mode and releasing a great amount of phosphor; and enabling mixed liquid and nitrified liquid from the aerobic terminal to together enter the anoxic zone of the A2O reactor, carrying out denitrification by using the denitrifying bacteria with the nitric nitrogen as an electronic receptor and organic matter as an electronic donator, and carrying out denitrification dephosphorization by using denitrification dephosphorization bacteria with the nitric nitrogen as the electronic receptor and the in-vivo PHAs as the electronic donator. The aerobic zone of the A2O reactor is mainly used for nitrification.

Description

technical field [0001] The invention relates to an urban sewage treatment device and method, which can achieve deep denitrification and dephosphorization of low C / N sewage, and belongs to the field of sewage treatment. Background technique [0002] The "eutrophication" caused by the excessive discharge of nutrients such as nitrogen and phosphorus has posed a serious threat to people's normal production and life. The most important way to control the eutrophication of water bodies is to deeply remove nitrogen and phosphorus from sewage, starting from the source of pollution Prevention and treatment. Carbon source is one of the more important factors affecting sewage treatment, and the most obvious feature of urban domestic sewage in my country is low C / N, which requires us to propose a process that can deeply remove nitrogen and nitrogen from low C / N domestic sewage phosphorus. Almost all simultaneous denitrification and phosphorus removal processes are single-sludge systems...

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Problems solved by technology

However, it is difficult to make A 2 The denitrification and phosphorus removal of the O process...

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