Start-up Performance of Anaerobic Ammonia Oxidation Reactors Inoculated with Different Sludge

The start-up performance of anaerobic ammonia oxidation reactors was investigated by inoculating with aerobic nitrifying sludge and autotrophic denitrifying sludge in two sets of anaerobic sequencing batch reactors(ASBR).The reactors are operated under the condition that the influent pH value ranges from 7.6 to 7.9 and the temperature is 32 ℃.After 176 and 170 d operation respectively,the start-up of reactors is obtained successfully.At the steady phase of operation,the volumetric total nitrogen(TN)loadings are 0.147 kgN/(m3·d)and 0.11 kgN/(m3·d),and the average removal efficiencies of TN are 84.81% and 81.57% respectively.The ratios of ammonia nitrogen and nitrite nitrogen reduction to nitrate nitrogen production are 1 ∶1.08 ∶0.31 and 1 ∶1.18 ∶0.33 respectively.The reactor inoculated with aerobic nitrifying sludge starts up more rapidly than that with denitrifying sludge,and the removal efficiency of ammonia nitrogen is also higher.