[Objective] The research aimed to study the denitrification effect of anaerobic ammonia oxidation reactor at room temperature.[Method] Fed with artificial wastewater and seeded with activated sludge from an oxidation ditch at a municipal wastewater treatment plant,a 3. 2 L UASB anammox reactor was to experiment the biological nitrogen removal at room temperature( 22-29 ℃). [Result]The average removal efficiencies of NH_4~+-N and NO_2~--N reached 93. 5% and 86. 1% respectively after 75 days operation,and the...