Nitrite effect on nitrous oxide emission from denitrifying activated sludge

Laboratory-scale experiments were conducted to examine the N 2O emission during the denitrification process. For each of the 6 runs carried out, synthetic effluent was fed in a 10 l batch mixed liquor to investigate the effect of nitrite on N 2O emission and Helium was continuously bubbled through t...

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Bibliographic Details
Published in:Process biochemistry (1991) Vol. 43; no. 6; pp. 683 - 689
Main Authors: Alinsafi, Asma, Adouani, Nouceiba, Béline, Fabrice, Lendormi, Thomas, Limousy, Lionel, Sire, Olivier
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.06.2008
Elsevier
Subjects:
Activated sludge
Batch reactor
Denitrification
Nitrite
Nitrous oxide
Denitrification
Activated sludge
Nitrous oxide
Batch reactor
Nitrite
ISSN:1359-5113, 1873-3298
Online Access:Get full text
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Summary:Laboratory-scale experiments were conducted to examine the N 2O emission during the denitrification process. For each of the 6 runs carried out, synthetic effluent was fed in a 10 l batch mixed liquor to investigate the effect of nitrite on N 2O emission and Helium was continuously bubbled through the reactor at constant rate (0.12 l/min) to favour N 2O transfer and detection. An increasing COD/NO 3 −-N influent ratio from 3 to 7 was firstly applied (runs 1–3). Secondly, NO 2 − pulse additions were performed during run 4 and 5 (10 and 20 mg N/l, respectively). Finally, the reactor was fed with influent containing both NO 2 − and NO 3 −. We showed that N 2O emission was detected shortly after NO 2 − accumulation, few minutes after the substrate feeding. The highest emission occurred at the lower COD/NO 3 −-N ratio (=3) and at the higher NO 2 − addition (20 mg N/l). In addition, the higher nitrogen conversion to N 2O gas (14.4%) was obtained with an influent containing initially both NO 2 − and NO 3 −. Our results suggest a direct effect of the NO 2 − concentration on the N 2O emission. We have also confirmed the inhibitory effect of NO 2 − concentration on N 2O reduction.
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ISSN:1359-5113
1873-3298
DOI:10.1016/j.procbio.2008.02.008