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发布时间：2019-03-10

论文类型：期刊论文

发表时间：2008-07-01

发表刊物：JOURNAL OF ENVIRONMENTAL SCIENCES

收录刊物：CSCD、ISTIC、PubMed、SCIE

卷号：20

期号：8

页面范围：933-939

ISSN号：1001-0742

关键字：simultaneous nitrification and denitrification (SND); chemical oxygen demand and nitrogen (COD/N) ratio; dissolved oxygen (DO) concentration

摘要：The effects of chemical oxygen demand and nitrogen (COD/N) ratio and dissolved oxygen concentration (DO) on simultaneous nitrification and denitrification (SND) were investigated using an airlift internal circulation membrane bioreactor (AIC-MBR) with synthetic wastewater. The results showed that the COD efficiencies were consistently greater than 90% regardless of changes in the COD/N ratio. At the COD/N ratio of 4.77 and 10.04, the system nitrogen removal efficiency became higher than 70%. However, the nitrogen removal efficiency decreased to less than 50%, as the COD/N ratio shifted to 15.11. When the operating DO concentration was maintained at 1.0 mg/L in AIC-MBR, a satisfying SND was achieved. Either low or high DO concentration could restrain SND.