Startup and Factors Affecting of Partial Nitrification in Sequencing Batch Reactor

Autotrophic shortcut nitrification process startup was studied to treat wastewater with high ammonia concentration using sequencing batch reactor(SBR). Effect of DO concentration,pH,temperature and carbon source on the nitrite accumulation rate was investigated respectively. The reactor was inoculated with nitrifying sludge and partial nitrification realized by using complete autotrophic bacteria. Nitrite accumulation was completed in DO concentration of 1.0～1.6mg/L and temperature of (35±1)℃. Results showed that more than 90% of ammonium removal efficiency and 95% of nitrite accumulation rate could be achieved when inflow ammonium concentration range was 280～300mg/L with reaction condition controlled as HRT at 12h,pH 7.5～8.5,temperature(28±1)℃ and DO concentration at 0.8～1.2mg/L.With addition of COD as carbon source and control to 50mg/L,nitrite accumulation rate and ammonium removal rate will be perfectly stable.