Abstract
The anaerobic ammonium oxidization (ANAMMOX) process has been attracted in nitrogen-rich rejected water treatment as a novel energy-saving technology. In order to well promote the application of ANAMMOX, the achievement and maintenance of about 57% of partial nitritation was investigated in this research. DO concentration was adjusted and altered by aeration rate, which was the main operational strategy in this study. The CSTR reactor was used and the temperature was set as about 25°C in this experiment. The concentration of NH4+-N in synthetic wastewater was 250mg/L, with the NLR as 0.5kgN/m3·d. The results showed that when the concentration of DO was set as 0.12mg/L, which led to the inhibition of the activity of NOB, optimal partial nitritation was achieved and maintained for about 50 days. The concentrations of FA and FNA at that condition were 11.4mg/L, 0.009mg/L, respectively. Hereby, The conclusion can be deduced that DO was a feasible and crucial parameter in the control of partial nitration in view of the association effects of FA and FNA concentrations caused by DO fluctuation.
