Shortcut nitrification at different temperature and ammonia concentration

A sequencing batch reactor was employed to treat high ammonia concentration wastewater and investigate the shortcut nitrification rates under different temperature and ammonia concentration conditions. During the start-up stage SRT and temperature were set at 12d and room temperature, and complete shortcut nitrification was achieved on 56d.The effect of temperature and ammonia concentration on ammonia oxidation rate, nitrite production rate was studied under the different ammonia concentration, as temperature was kept at 20, 25, 30, 35°C.The results showed that the optimal temperature was 30°C based on ammonia oxidation rate and sludge system. With temperature 30°C, the maximum ammonia oxidation rate was achieved and to be 28.5×10^-3·mgNH₄⁺-N·h^-1 mgMLSS^-1 under ammonia concentration of 100 mg NH4 -N/L.With the increase of ammonia concentration, the sludge system had a better adaptability and resilience under shock loading of ammonia.