Treatment process and device for municipal sewage multistage A/O combined nitrogen and phosphorus removal

Abstract

The invention relates to a treatment process and device for municipal sewage multistage A / O combined nitrogen and phosphorus removal, and particularly discloses a municipal sewage treatment process. The device comprises a pretreatment system, a stage water inlet system, a phosphorus removal system, a nitrogen removal system, a reflowing system and a carbon source addition system. Pretreated domestic sewage enters a nitrogen and phosphorus removal system in a stage dividing manner, phosphorus and carbon are removed through a primary oxygen deficit system, a primary anaerobic system and a primary aerobiotic system, the domestic sewage enters a denitrification system formed by a secondary oxygen deficit system and a secondary aerobiotic system, a film component is communicated with the bottomof a tank and covers the bottom of the tank, an unpowered inner cycle is achieved by an interval aeration mode, and nitrogen is removed. The device has the advantages that an optimized nitrogen and phosphorus removal system improves phosphorus and nitrogen removal efficiency, outlet water quality is improved by the film component, treatment of sewage is omitted, investment of a power device is reduced by the formed unpowered inner cycle, cost is effectively reduced, and multistage feed parameters can be flexibly adjusted to adapt to change of water quality.

Description

technical field [0001] The patent of the invention relates to a treatment process for urban domestic sewage, in particular to a treatment process for multi-stage A / O combined denitrification and phosphorus removal of urban domestic sewage. Background technique [0002] At present, traditional activated sludge method, biofilm method, and membrane separation technology are commonly used in urban domestic sewage treatment technologies: [0003] Traditional activated sludge is a continuous mixed culture of sewage and various microbial groups under artificial oxygenation conditions to form activated sludge. The biological coagulation, adsorption and oxidation of activated sludge are used to decompose and remove organic pollutants in sewage, and then separate sludge from water. Most of the activated sludge is returned to the aeration tank, and the excess is discharged from the system. Common traditional activated sludge methods and their variants include: AB, SBR, oxidation ditch...

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Problems solved by technology

[0012] In order to solve the problems of large energy consumption in urban domestic sewage treatment, insufficient utilization of water resources, inability to achieve optimal nitrogen and phosphorus removal at the same time, and difficulty in meeting high-standard requirements for effluent water quality, the invention provides a multi-stage A / O Combined Nitrogen and Phosphorus Removal Process

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