Method for treating low C/N sewage by anaerobic-aerobic-anoxic-moving bed autotrophic nitrogen removal process

Abstract

The invention belongs to the technical field of environmental pollution control engineering, and provides a method for treating low C / N sewage by an anaerobic-aerobic-anoxic-moving bed autotrophic nitrogen removal process, an anaerobic tank, an aerobic tank, an anoxic tank and a sedimentation tank are connected in sequence, and the process mainly comprises anaerobic phosphorus release, aerobic excess phosphorus uptake and ammonia nitrogen nitrification and anoxic sulfur autotrophic denitrification nitrogen removal. Wherein an alkalinity slow-release porous spherical shell suspended filler which not only can be used as an inorganic carbon source and an alkalinity slow-release source, but also can improve the sulfate recovery problem in the sulfur autotrophic denitrification process is adopted in the sulfur autotrophic denitrification anoxic tank, so that the form of a moving bed is formed. The process has the advantages that phosphorus and nitrogen removal is carried out in different units, and organic carbon source competition is reduced; the biological phosphorus removal effect is improved, and the dosage of a phosphorus removal agent is reduced; nitration liquid backflow is not needed, and energy consumption is effectively reduced; suspended filler recovery operation is simple and convenient; sulfate in effluent is reduced; autotrophic nitrogen removal is adopted, and no additional organic carbon source is needed, so that the operation cost is further reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control engineering, relates to research on an anaerobic-aerobic-anoxic-moving bed autotrophic denitrification (AOA-MBNR) process, and particularly relates to an application to biological denitrification of low-C / N sewage Research on nitrogen and phosphorus removal. Background technique [0002] Nitrogen pollution is one of the important causes of water eutrophication and has become a serious environmental problem in the aquatic ecosystem. According to the article "Application Status of Nitrogen and Phosphorus Removal Processes in Urban Sewage Treatment Plants in my country", it can be seen that the traditional anaerobic-anoxic-aerobic (A 2 O) process for biological denitrification and dephosphorization, that is, the sewage is first released from the anaerobic tank, and then the heterotrophic denitrifying bacteria in the anoxic tank use the organic matter as the carbon source to r...

AI Technical Summary

Problems solved by technology

Generally speaking, as mentioned in the article "Pilot-scale application of sulfur-limestone autotrophic denitrification biofilter for municipal tailwater treatment: Performance and microbial community structure", in the engineering application of sulfur-limestone autotrophic denitrification technology, more Sulfur-limestone autotrophic denitrification (SLAD) biofilter is mostly used, but the fixed bed biofilter is easy to clog, requiring regular flushing and replacement of the filter material, and the filter material is easily distributed unevenly, the process operation is complicated, and the filler High cost of replacement and maintenance

Therefore, the above factors limit the practical engineering application of sulfur autotrophic denitrification technology.

[0005] On this basis, the present invention is mainly aimed at traditional low C / N sewage A 2 The limitation of heterotrophic denitrification in O nitrogen and phosphorus removal process requires additional organic carbon source, as well as the problems of alkalinity consumption and sulfate production faced by sulfur autotrophic denitrification technology, providing an anaerobic-aerobic- Anoxic-Moving Bed Autotrophic Denitrification (AOA-MBNR) Process for Treating Low C / N Sewage