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Nitrite accumulation and nitrous oxide emission during denitrification processes with quinoline or indole as the sole carbon source
Author(s) -
Wang Lin,
Tian Jianqiang,
Li Yongmei
Publication year - 2015
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4439
Subject(s) - quinoline , denitrification , chemistry , nitrite , indole test , carbon fibers , nitrous oxide , nitrogen , environmental chemistry , carbon source , inorganic chemistry , nitrate , organic chemistry , biochemistry , materials science , composite number , composite material
BACKGROUND Batch experiments were conducted to investigate nitrite accumulation and N 2 O emission during the denitrification processes when quinoline or indole was used as the sole carbon source. The effects of COD / NO 3 − ‐N ratio and pH were studied. RESULTS While both significant transient nitrite accumulation and N 2 O emission occurred when quinoline was used as the carbon source, little denitrification intermediates were observed when indole was used as the carbon source. The optimal COD / NO 3 − ‐N ratio for both complete denitrification and degradation of quinoline and indole were 6.8 and 5.1. Denitrification was inhibited under acidic conditions no matter with quinoline or indole as the carbon source. The optimal pH was 7.5 for both quinoline (or indole) degradation and denitrification. The nitrite accumulation and different carbon source further influenced N 2 O emission. When quinoline was used as the carbon source, N 2 O emission was observed at COD / NO 3 − ‐N ≤ 5 and pH ≤ 7.5; when indole was used as the carbon source, N 2 O emission was observed at COD / NO 3 − ‐N ≤ 3 and pH ≤ 6.5. Higher concentration of N 2 O was emitted at lower COD / NO 3 − ‐N ratio and pH . CONCLUSION COD / NO 3 − ‐N ratio, pH and the types of carbon source significantly influenced the accumulation of denitrification intermediates. © 2014 Society of Chemical Industry