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Nitrite effect on nitrous oxide emission from denitrifying activated sludge

Paper ID Volume ID Publish Year Pages File Format Full-Text
35853 45110 2008 7 PDF Available
Title
Nitrite effect on nitrous oxide emission from denitrifying activated sludge
Abstract

Laboratory-scale experiments were conducted to examine the N2O 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 N2O emission and Helium was continuously bubbled through the reactor at constant rate (0.12 l/min) to favour N2O transfer and detection. An increasing COD/NO3−-N influent ratio from 3 to 7 was firstly applied (runs 1–3). Secondly, NO2− 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 NO2− and NO3−. We showed that N2O emission was detected shortly after NO2− accumulation, few minutes after the substrate feeding. The highest emission occurred at the lower COD/NO3−-N ratio (=3) and at the higher NO2− addition (20 mg N/l). In addition, the higher nitrogen conversion to N2O gas (14.4%) was obtained with an influent containing initially both NO2− and NO3−. Our results suggest a direct effect of the NO2− concentration on the N2O emission. We have also confirmed the inhibitory effect of NO2− concentration on N2O reduction.

Keywords
Activated sludge; Denitrification; Batch reactor; Nitrous oxide; Nitrite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 43, Issue 6, June 2008, Pages 683–689
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us