Removal of Nitrogen Oxide Based on Anammox through Fe(II)EDTA Absorption

Abstract

Nitrogen oxides in flue gas cause considerable environmental and health problems. In this study, the NO removal through Fe(II)EDTA absorption based anaerobic ammonium oxidation (Anammox) reduction was first evaluated in batch tests. The removal efficiency and removal rate of NO reached 74.5%–85.4% and 1.62–15.48 μmol NO gVSS–1 h–1 with Fe(II)EDTA absorption, respectively. The optimal temperature and pH for Fe(II)EDTA absorption based Anammox reduction of NO was 30 °C and 7.0 in the range of temperature from 25 to 45 °C and pH from 6.5 to 8.0, respectively. The maximum specific substrate utilization rate and half-saturation constant of Fe(II)EDTA-NO were experimentally determined as 0.09 mmol N gVSS–1 h–1 and 1.338 mM, respectively. Then, a sequencing batch reactor (SBR1) performing Fe(II)EDTA absorption based Anammox reduction for NO removal was continuously operated for 35 days. The NO removal performance of SBR1 decreased gradually, and the NO removal efficiency and NO removal rate decreased from 86.65%...