Technology and device for efficiently removing nitrogen and phosphorus from urban sewage with low carbon-nitrogen ratio

Abstract

The invention discloses a technology and a device for efficiently removing nitrogen and phosphorus from urban sewage with a low carbon-nitrogen ratio. The technology comprises a process of excessivelyabsorbing phosphorus by phosphorus removing bacteria, a process of ammonia nitrogen nitrosification and a process of anaerobic ammonia oxidation, the processes are carried out synchronously in sequence, and continuous water input and continuous water output are realized. The device comprises a regulating tank, an anaerobic tank, an aerobic tank, a mid-sedimentation tank, a partial nitrification reactor, an anaerobic ammonium oxidation reactor and a final sedimentation tank which are connected in sequence. The technology has the advantages of being simple in process, short in total hydraulic retention time, low in aeration rate, low in energy consumption, high in biological concentration, good in effluent quality and convenient to operate and manage and occupying a small area, and has great guiding significance for development of a new technology for treating the urban sewage with the low carbon-nitrogen ratio and upgrading of an existing treatment technology.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a process and a device for efficiently denitrifying and dephosphorizing urban sewage with a low carbon-to-nitrogen ratio. Background technique [0002] The eutrophication problem in most water bodies in my country is becoming more and more serious, and the excessive nitrogen and phosphorus elements are the main factors leading to the seriousness of the problem, which has a certain relationship with the excessive discharge of nitrogen and phosphorus from sewage plants. However, according to survey statistics, as many as 65% of sewage treatment plants have insufficient carbon sources, and the carbon sources in sewage can hardly meet the needs of microbial nitrogen and phosphorus removal. Studies have shown that only when the carbon-to-nitrogen ratio is greater than 4 can the denitrifying bacteria be provided with an appropriate amount of carbon sourc...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to improve the traditional A 2 / O denitrification and phosphorus removal process, combined with activated sludge method and biofilm method, proposes a new high-efficiency simultaneous denitrification and phosphorus removal process to achieve stable and efficient nitrogen removal

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