[Study on biological nutrients removal in loop reactor].

The simultaneity nitrification and denitrification (SND) was studied in a loop reactor. In the experiment, the research of biological nutrients removal was carried by changing carbon source and the method of adding carbon source, and the concentration of NOx(-)-N and the dissolved oxygen (DO) level were also inspected. The results indicated that the removal of NH4+-N could be enhanced by adding carbon source with COD 800 mg/L + 800 mg/L.