Nitrogen Removal Performance of Continuous Anoxic/Oxic System Using Activated Sludge and Sludge Biofilms

• 作者: GHORI Faheem Ahmed CHEN Hong YU Xin SHE Shuaiqi XUE Gang CHEN Shanping SABIHA Yousuf
• 来源期刊: 东华大学学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Resource,Ecology and Environment
• 页码范围: 351-358
• 页数: 8页
• 分类号: X506
• 语种: 英文
• DOI: 10.19884/j.1672-5220.202101010

摘要

Nitrogen is the most important component for living beings while the excessive discharge of organic and inorganic nitrogen may create severe environmental problems.In this study,a continuous anoxic/oxic(A/O)reactor adopting activated sludge and sludge biofilms in the anoxic and oxic zones was applied for total nitrogen(TN)and chemical oxygen demand(COD)removal,and the efficiencies of nitrification and denitrification were compared as well.Results showed that when using activated sludge,the effluent concentrations of NH4+-N,NO3--N,NO2--N,TN and COD were inconsistent and fluctuated greatly,and the removal efficiencies of corresponding nitrification,denitrification and TN were also unstable;the obtained average COD removal efficiency was 85％.While using sludge biofilms,the acquired effluent concentrations of NH4+-N,NO3--N,NO2--N,TN and COD became stable and constant.The nitrification,denitrification,TN and COD removal efficiencies were 96％,84％and 65％and 94％,respectively.Bacterial community analysis of sludge biofilms indicated that the genus Arcobacter was the major denitrifiers in the anoxic zone with relative abundance of 76.1％,and in the oxic zone the abundances of Acinetobacter,Hydrogenophaga and Nitrospira responsible for complete nitrification were 20.05％,7.6％and 3.7％respectively.The high abundance of nitrifying bacteria and denitrifiers were related with the high and stable nitrogen and COD removal.