Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (11): 1-5.

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Effect of DO on Nitrogen Removal Efficiency by Simultaneous Nirtification/Denitrification of Wastewater from Waste-Compactin Station

Zhou Shao-qi  Zhang Hong-gou  Yang Zhi-quan   

  1. College of Environmental Science an Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-01-04 Online:2005-11-25 Published:2005-11-25
  • Contact: 周少奇(1965-)，男，教授，博士生导师，主要从事环境生物技术、城市污水处理、固体废物处理与资源化研究 E-mail:fesqzhou@scut.edu.ca
  • About author:周少奇(1965-)，男，教授，博士生导师，主要从事环境生物技术、城市污水处理、固体废物处理与资源化研究
  • Supported by:

    国家科技成果重点推广项目(2005EC000288)；广东省科技攻关项目(2002C32108)；教育部“新世纪优秀人才”计划项目资助

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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),CODcr and to-tal nitrogen(TN)contents in the bioreactor with DO content were investigated.The results demonstrated that the removal efficiencies of NH4+ -N,CODcr 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