Biological denitrification method for realizing short-cut nitrification and denitrification with sequencing batch activated sludge process

Abstract

The invention provides a biological denitrification method for realizing short-cut nitrification and denitrification with a sequencing batch activated sludge process. The method comprises the following steps: feeding water, performing aerated aerobic nitrification, stirring for anoxic denitrification, performing aerated aerobic nitrification, stirring for short-time aeration stripping of N2, precipitating and draining water; controlling the reaction time of all aerobic and anoxic stages within the period according to the characteristic changes of parameters of DO, ORP and pH in real time. According to the method, the reaction time of all the alternative aerobic and anoxic stages of an SBR can be controlled in real time, so that the problem of automatic control of the SBR is solved; in addition, through adoption of the real-time control method, aeration is ended timely, and the water temperature is controlled at the temperature of 25-30 DEG C, so that nitrobacteria can be prevented frombeing cultivated in a system. Meanwhile, NO3-N/NOx-N is always 5% or below in a nitrification reaction process, so that the stable operation of the short-cut nitrification and denitrification can beensured.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biological denitrification technology and a treatment method for realizing short-range nitrification and denitrification by a sequencing batch activated sludge method. Background technique [0002] In recent years, with the increasingly stringent discharge standards for sewage treatment, the removal of nitrogen in sewage has become the top priority of sewage treatment plants. Nitrogen removal methods in wastewater mainly include physical and chemical methods and biological methods. Physicochemical denitrification generally only removes a certain form of nitrogen in sewage, and there are problems such as high treatment cost, secondary pollution to the environment and imperfect regeneration methods. [0003] Biological denitrification refers to the process in which organic nitrogen and ammonia nitrogen in sewage undergo ammoniation, nitrification, and denitr...

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Problems solved by technology

[0005] At present, the vast majority of sewage treatment plants in my country BOD 5 Both / TN and COD / TN are relatively low. In order to ensure that the effluent meets the standard, additional carbon sources are often required. Operation and commissioning require professional control, and operation management is very complicated, resulting in a significant increase in operating costs.