Effect of Substrate Ratio on Nitrogen Removal Performance of ANAMMOX in ABR

Abstract

In order to solve the problem of low nitrogen removal caused by incomplete removal of anaerobic ammonium oxidation (ANAMMOX) substrate, The nitrogen removal performance of the ANAMMOX was investigated by controlling different influent substrate ratios in an anaerobic baffled reactor (ABR). The result showed the optimal influent NO2--N/NH4+-N was 1.34 with which the NH4+-N and NO2--N removal efficiencies were about 99.99% and the total nitrogen removal efficiency reached a peak of 87%. When the influent NO2--N/NH4+-N gradually reduced from 1 to 0.49 and increased from 1.34 to 1.62, the absolute removal of NH4+-N and NO2--N was stable in the reactor and no significant inhibition was observed in the system. Under the condition of different substrate ratios, the removal of NH4+-N and NO2--N was basically consumed in the first compartment of ABR, the change of substrate ratio did not have an obvious impact on the nitrogen removal performance of each compartment in the ABR, thus, the ABR ANAMMOX system had good stability to the change of substrate concentration.