关键词: 溶解氧, 同时硝化反硝化, 同时好氧厌氧生物反应器, 垃圾压缩站, 废水

Abstract:

Dissolved oxygen(DO)content is a key affective factor for the biological nitrogen removal by simuha-neous nitrification and denitrification.In this paper, a simultaneous oxic/anaerobic bioreactor(SOA)was used to treat the wastewater from a waste-compacting station.The variations of ammonia nitrogen(NH4+ -N),COD_cr and to-tal nitrogen(TN)contents in the bioreactor with DO content were investigated.The results demonstrated that the removal efficiencies of NH4+ -N,COD_cr and TN in the bioreactor were significantly afected by DO content.Two phases,namely,the fast phase and the slow phase of ammonia denitrification,can be observed at a DO content of 1.0 mg/L.Moreover,when the DO content dropped to about 0.5 mg/L,a balanced state of the aerobic area and the anoxic area in the SOA was achieved and an optimal simuhaneous nitrification and denitrification efficiency was achieved as well.It was estimated that anaerobic ammonium oxidation(ANAMMOX)took place in the bioreactor
to contribute to the nitrogen removal.

Key words: dissolved oxygen, simuhaneous nitrification and denitrification, simultaneous oxic/anaerobic bioreac-tor, waste-compacting station, wastewater