A constructing method of an autotrophic denitrification system for low-concentration ammonia nitrogen sewage

Abstract

The invention relates to a constructing method of an autotrophic denitrification system for low-concentration ammonia nitrogen sewage. A sequencing batch type constructed wetland and a sequencing batch type anaerobic biofilm two-stage reactor are adopted. The method includes a step of feeding tail water from a sewage plant at 15-30 DEG C to the sequencing batch type constructed wetland firstly, and performing a cyclic process comprising water feeding, reacting, water discharging and venting to allow the constructed wetland to be idle in order at 15-30 DEG C so that a stable short-range nitrosation system for the low-concentration ammonia nitrogen sewage is constructed by utilizing a restricted oxygen providing characteristic of the constructed wetland; and a step of feeding water discharged from the constructed wetland into the sequencing batch type anaerobic biofilm reactor, and performing a cyclic process comprising water feeding, reacting and water discharging in order at 15-30 DEG C with a combined filler being disposed in the reactor and the biofilm forming density being 50-60% so that an anaerobic ammonia oxidation system for the low-concentration ammonia nitrogen sewage is constructed. Through the two systems, deep autotrophic denitrification of the low-concentration ammonia nitrogen sewage is achieved. The method is efficient, stable, low in energy consumption, short in process, low in investment and low in running cost.

Description

Technical field [0001] The invention belongs to a sewage biological treatment method, and in particular relates to the construction of a deep autotrophic denitrification treatment system for the treatment object of low-carbon source and low ammonia nitrogen concentration wastewater similar to the tail water of a sewage plant. Background technique [0002] With the rapid development of China’s economy and the continuous acceleration of the process of urbanization, the discharge of urban sewage treatment plant tail water has been increasing year by year. At present, the level B discharge standard or level A discharge standard implemented by the urban sewage treatment plant is discharged from the municipal sewage plant. Compared with the Class V water quality standards specified in the Surface Water Environmental Quality Standards (GB3838-2002), the tail water quality is still an external point source pollution, and the treated effluent still carries a large amount of nitrogen and ph...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the bottleneck problem of deep denitrification of the tail water of the existing low-carbon source sewage plants, the purpose of the present invention is to provide a construction method for the autotrophic denitrification system of low-concentration ammonia-nitrogen sewage, which is efficient and stable in development, low in energy consumption, and has a short process flow. Deep denitrification technology with low investment and operating costs

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