Shortcut Nitrification and ANAMMOX Combined Process for Autotrophic Ammonia Removal

The shortcut nitrification was realized in a sequencing batch reactor (SBR) when the temperature and pH value were controlled at 28~30degC and 7.8~8.1. The nitrogen removal loading reached 0.129 kg NH
₄

⁺
-Nldrkg
^-1
VSSldrd
^-1
by increasing the influent ammonia concentration. More than 85% of the nitrite accumulative efficiency was achieved and the ratio of ammonium oxidation bacteria to nitrite oxidation bacteria was 10
³
: 1. To match the effluent nitrite concentration of the SBR, the influent ammonia concentration in anaerobic rotating biological contactor was increased from 80 mg I
^-1
to 218 mg I
^-1
. Both shortcut nitrification and ANAMMOX process ran steadily when they were combined for autotrophic ammonia removal. The removal efficiency and the removal loading rate of the ammonia reached 85% and 0.133 kg NH
₄

⁺
-N kg
^-1
VSS d
^-1
in the SBR. 86% of ammonia removal efficiency, 97% of nitrite removal efficiency and 90% of TN removal efficiency were achieved and the nitrogen loading rate reached 0.488 kg TN m
^-3
day
^-1
.