Segmented water inlet multistage anoxic/aerobic biological denitrification treatment method for sewage at low temperature

Abstract

The invention discloses a segmented water inlet multistage anoxic / aerobic biological denitrification treatment method for sewage at a low temperature. The method adopts a continuous flow operation mode, sewage enters a first-stage A / O reaction unit and a second-stage A / O reaction unit from two position points after being subjected to first-stage treatment, the effluent of a water outlet end of thefirst-stage A / O reaction unit is lifted and refluxed to a water inlet end of the first-stage A / O reaction unit, the effluent of a water outlet end of the second-stage A / O reaction unit is lifted andrefluxed to a water inlet end of the second-stage A / O reaction unit, and the effluent from a water outlet end of the third-stage A / O reaction unit is clarified and separated and finally discharged. According to the method, a sewage treatment mode of two-stage water feeding and three-stage anoxic / aerobic combined reaction zoning biofilm functionalization is adopted, according to the method, the reflux ratio of each section can be optimally controlled according to the amount of denitrification available organic matters in the raw water, so that the possible section hydraulic load influence problem in the functional reactor is reduced while denitrification nitrogen removal is ensured, and efficient removal of the organic matters and nitrogen-containing pollutants at a low temperature is realized.

Description

technical field [0001] The invention relates to a method for treating sewage by segmented water inflow, multi-stage deficient / aerobic combined reaction, zoned biofilm functionalization, and belongs to the technical field of sewage treatment. Background technique [0002] At present, with the higher requirements for water pollutant discharge standards of urban sewage treatment plants, especially water quality indicators such as organic matter, ammonia nitrogen, and total nitrogen tend to be more stringent, especially at low temperatures. The traditional sewage biological denitrification treatment process is obviously can no longer meet the requirements. In order to improve the efficiency of biological denitrification of urban sewage at low temperature, the traditional single-stage or multi-stage anoxic / aerobic (A / O) process based on activated sludge needs to set a longer sludge age and theoretical hydraulic retention time to ensure The number of nitrifying bacteria in the ac...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing sewage biological denitrification and phosphorus removal technology and the demand for high-efficiency denitrification technology for urban sewage treatment, the present invention proposes a sewage biological denitrification treatment method with multi-stage anoxic / aerobic water inflow at low temperature, which can solve the problem of low temperature in winter Low-temperature nitrification restrictive bottlenecks and low denitrification utilization efficiency of biodegradable organic matter in raw water are common problems in urban sewage treatment under low temperature conditions (6-15°C). It can meet the high standard discharge requirements in different regions, especially under low temperature conditions.

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