Simultaneous removal process of nitrogen and phosphorous in wastewater

摘要

This invention relates to a simultaneous removal process of nitrogen and phosphorous in wastewater, wherein it comprises:

1) performing a simultaneous denitrification process for facultative chemolithoautotrophic, heterotrophic and obligate chemolithoautotrophic denitrification through supply of external carbon source in small amount (1/3-1/2 of requirement for heterotrophic denitrification) in full consideration of that facultative chemolithoautotroph, which is well growing in organic materials, among chemolithoautotrophic-based denitrification microorganisms;

2) using a shell or a steel slag, together with sulfur particles, wherein (1) sulfur particles are used as electron donor and solid media on which sulfur denitrifier can grow, (2) as solid media, the shell plays a role to maintain pH 7-8 through the supplement of alkalinity when pH is further lowered due to hydrogen ion generated from sulfur denitification, while retaining the activity of denitrifying microorganism and supplying inorganic carbon source (CO2) for chemolithoautotrophs; and,

3) performing a simultaneous removal process of phosphorous by precipitation in the presence of calcium ion (Ca2+) in water generated from shell or steel slag.