[Promoting Nitrogen Removal in ANAMMOX Biofilm Reactor by Fe Under Low Nitrogen Concentration].

The feasibility for nitrogen removal in a two-stage ANAMMOX biofilm reactor promoted by Fe under low nitrogen concentration was investigated. The results showed that the ANAMMOX reaction could be effectively promoted by a (Fe) of 5, 10, and 15 mg·L. A (Fe) of 10 mg·L presented the highest promotion for the ANAMMOX reaction, with the highest nitrogen removal efficiency (NRE) of 81.