Method for realizing short-cut nitrification and stable maintenance through multi-mode Cu < 2 + > stress directional regulation and control

Abstract

The invention discloses a method for realizing shortcut nitrification and stable maintenance through multi-mode Cu < 2 + > stress directional regulation and control, and relates to the technical field of biological sewage treatment. According to the method, the short-cut nitrification is started by utilizing the multi-mode gradient concentration Cu < 2 + > stress activated sludge system, and the nitrite accumulation rate of the activated sludge system reaches more than 80% after different-mode concentration stress is sequentially carried out. Besides, the PLC is used for controlling, multi-mode Cu < 2 + > stress treatment is adopted during short-cut nitrification damage, and sludge exchange is carried out, so that not only can the higher nitrite accumulation rate of an activated sludge system be maintained, but also the condition that the sludge generates tolerance to Cu < 2 + > with single concentration or one concentration gradient is avoided, and the stable operation of the short-cut nitrification system is realized. According to the method, short-cut nitrification can be started without controlling harsh environmental conditions, and after short-cut nitrification is successfully started, Cu < 2 + > adding is stopped, so that the system can still keep a relatively high nitrite accumulation rate and can maintain the stability of short-cut nitrification.

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