To prevent sediment deposition and snail breeding from affecting the oxygenation effect of biological treatment and utilization of air flotation water, and to improve the removal effect of ammonia nitrogen in river water, a new process had been developed with the pilot to study the removal mechanism and reaction kinetics. The results showed that the concentration of NO2-N in the effluent from the biological contact oxidation zone had significantly doubled, while the concentration of NO3-N in the effluent had only increased by 19%, and the concentration of NO3-N in the effluent from the filter had significantly increased. The nitrification rates of the rotating packing and zeolite could decrease significantly after an hour. The removal rate after 1.5 h was close to the final value. The oxygen consumption rates of the upper and lower rotating fillers were 0.6921 and 0.7743 mgO2/L/h respectively, and those of the upper and lower zeolites were 0.3386 and 0.4407 mgO2/L/h respectively.