A nitrogen and phosphorus removal treatment system and method for urban domestic sewage with a low carbon-to-nitrogen ratio

Abstract

The invention discloses a nitrogen and phosphorus removal treatment system and method for low-carbon-nitrogen-ratio municipal wastewater. The system comprises an anaerobic tank and an anoxic tank, water inlets of the anaerobic tank and the anoxic tank are both connected with a wastewater inflow pipeline of the system, and water outlets of the anaerobic tank and the anoxic tank are connected with a water inlet of an aerobic reaction tank through pipelines; the bottom of the aerobic reaction tank is provided with sludge mixed liquor reflux pipelines respectively connected with water inlets of the anaerobic tank and the anoxic tank; the bottom of the aerobic reaction tank is provided with a compressed air inlet pipe, an MBR (membrane bioreactor) separation membrane is further arranged in the aerobic reaction tank, and a water outlet of the MBR separation membrane is connected with a water outlet pipe of the system. The system and method is low in cost, good in water treatment effect, high in removal rate of nitrogen, phosphorus and organic matters in the low-carbon-nitrogen-ratio wastewater, and less in surplus sludge amount.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a nitrogen and phosphorus removal treatment system and method for urban domestic sewage with a low carbon-to-nitrogen ratio. Background technique [0002] With the intensification of eutrophication in water bodies, the removal of plant nutrients such as nitrogen and phosphorus has become an important task in urban sewage treatment. Sewage biochemical treatment technology is the main technology in sewage treatment. As an economical and effective means, it plays an extremely important role in preventing water body pollution and improving water body functions. A 2 The / O process is widely used in urban sewage treatment because it can realize simultaneous denitrification and phosphorus removal. More than 80% of the world's denitrification and phosphorus removal are completed through this process. But currently A 2 The removal of nitrogen and phosphorus by the / O nitrogen and phospho...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-cost, high-efficiency water treatment for the defects in the prior art that there will be residual organic matter in the water after treatment, which not only affects the water quality but also increases the operating cost, and is effective for low-carbon-nitrogen ratio sewage nitrogen. Nitrogen and phosphorus removal treatment system and method for urban domestic sewage with low carbon-to-nitrogen ratio, high removal rate of phosphorus and organic matter, and less residual sludge

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