Frontiers of Environmental Science & Engineering
>> 2014,
Volume 8,
Issue 4
doi:
10.1007/s11783-013-0571-7
RESEARCH ARTICLE
Production of N
1. Shijiazhuang Institute of Railway Technology, Shijiazhuang 050061, China.2. School of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China
Available online: 2014-06-11
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Abstract
The N O production in two nitrogen removal processes treating domestic wastewater was investigated in laboratory-scale aerobic-anoxic sequencing batch reactors (SBRs). Results showed that N O emission happened in the aerobic phase rather than in the anoxic phase. During the aerobic phase, the nitrogen conversion to N O gas was 27.7% and 36.8% of loss for conventional biologic N-removal process and short-cut biologic N-removal process. The dissolved N O was reduced to N in the anoxic denitrification phase. The N O production rate increased with the increasing of nitrite concentration and ceased when oxidation was terminated. Higher nitrite accumulation resulted in higher N O emission in the short-cut nitrogen removal process. Pulse-wise addition of 20 mg gave rise to 3-fold of N O emission in the conventional N-removal process, while little change happened with 20 mg was added to SBR1.
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