Shortcut nitrifictaon denitrification proecss treating old landfill leachate ammonia nitrogen

The effects of dissolved oxygen concentration, temperature and other operation factors on shortcut nitrification and denitrification process for the treatment of landfill leachate was studied in a sequencing batch reactor. The results showed that the termination of aeration could effectively control the reaction at the phase of nitrite and could get stable removal rate of ammonia nitrogen and relatively high accumulation rate of nitrite when dissolved oxygen concentration rapidly increased. The increase of dissolved oxygen concentration and temperature were propitious to the rise of volume loading in the process of shortcut nitrification and denitrification. It is relatively appropriate that the dissolved oxygen concentration and temperature was respectively about 1.0mg/L and more than 25°C in the process of shortcut nitrification and denitrification process treating landfill leachate. When pH value was not controlled in the reaction process and temperature ranged from 25°C to 28°C and the dissolved oxygen concentration of nitrification was about 1.0mg/L and the ammonia nitrogen loading was less than 0.25gNH₄⁺-N/(L.d), the effluent concentration of ammonia nitrogen and nitrite was respectively less than 15mg/L and 1mg/L and the removal rate of total nitrogen more than 98%.