Pilot Study on Shortcut Biological Nitrogen Removal With Synthetic Ammonia Industrial Wastewater

A pilot-scale study on shortcut biological nitrogen removal from synthetic ammonia industrial wastewater was researched in an aerobic-anoxic system.The industrial wastewater contained a high NH₄⁺-N concentration with 80-110 mg/L.Experimental results showed that a stable short-cut nitrification and denitrification was achived after a period of 90 d operation.The accumulation nitrite was keeping above 80%.The removal efficiencies of COD、NH₄⁺-N and TN was 95%,99% and 80%,respectively.In addition,the mechanism analysis showed that the main reason for getting the stable short-cut nitrification and denitrification in the pilot system was attributed to the collaboration of low dissolved oxygen (DO),high free ammonia (FA) and appropriate hydraulic retention time (HRT).