A short-path nitrification start-up method for continuous flow of sewage with low c/n ratio at room temperature

Abstract

The invention relates to a normal-temperature low-C / N-ratio sewage continuous shortcut nitrification starting method, and belongs to the sewage treatment and regeneration field. The method comprises the following steps: dividing the aerobic zone of an A<2>O reactor into three segments comprising an aerobic segment 1, an aerobic segment 2 and an aerobic segment 3 along a water flow direction, and refluxing a nitrification liquid to an anoxic zone from the aerobic segment 3; and inoculating nitrated sludge into the reactor until the concentration of sludge in the reactor is 2.5-3g / L, rapidly elutriating nitrite oxidation bacteria (NOB) with continuous flow short-sludge-age water at a water temperature of 23-25DEG C, screening ammonia-oxidizing bacteria (AOB), adding a cylindrical polypropylene suspension filler into an aerobic zone, recovering the long sludge age, reducing the dissolved oxygen concentration of the aerobic zone, and maintaining the above conditions until the mass concentration of ammonia nitrogen in water discharged from the A<2>O reactor decreases to below 2mg / L and the nitrosification rate stably maintains above 80% in order to complete the continuous shortcut nitrification starting. The starting method realizes the advanced treatment of the N element through shortcut nitrification denitrification, and is simple and feasible.

Description

technical field [0001] The invention belongs to the field of sewage treatment and regeneration. Specifically, the invention relates to the quick start of short-cut nitrification of a continuous flow reactor specially used for treating normal temperature and low C / N ratio sewage. Background technique [0002] With the rapid growth of population, the rapid development of economy and the intensification of human activities in our country, the pollution of water bodies is becoming more and more serious, especially the eutrophication of water bodies caused by nitrogen and phosphorus elements is the most prominent, which has great impact on the ecological environment and human health. had a great impact. At present, for the removal of nitrogen, urban sewage treatment plants mostly adopt the denitrification process based on the traditional nitrification and denitrification principle, such as A / O, oxidation ditch, A 2 / O process, etc. [0003] such as A 2 The / O method is a clas...

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Problems solved by technology

However, the process requires a higher temperature, which limits its application

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