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Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses

Paper ID Volume ID Publish Year Pages File Format Full-Text
20153 43160 2015 7 PDF Available
Title
Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses
Abstract

A laboratory-scale sequencing batch reactor fed with synthetic high-ammonium wastewater was operated for autotrophic partial nitritation, and the characteristics of N2O emission were investigated by both macro- and microanalysis. A N2O emission quantity of 5.98 ± 1.24 mg (n = 17) was observed, accounting for 0.997% ± 0.408% of the influent nitrogen. The N2O level in the off-gas first increased to a maximum of 91.5 ppmv in the initial 50 min, and then decreased and remained around 34.8 ppmv until the end of aeration. An asymptotic function (y = 14.3–14.2 × 0.992x, R2 = 0.997) could be used to estimate the quantity of N2O emitted. Microelectrodes were used to explore the variations in the nitrogen distribution and consumption rate within sludge flocs as the reaction proceeded. During the aeration phase, partial nitritation occurred mainly in the surface layer of flocs. This is where most N2O was produced, indicating that N2O was generated as a byproduct of the nitritation. During the settling phase, the N2O concentration and volumetric production rate were much higher than those in the aeration phase, suggesting that the settling phase contributes to the initial N2O emission peak.

Keywords
Sequencing batch reactor; Partial nitritation; Nitrous oxide; Microelectrode; Ammonia-oxidizing bacteria
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Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 120, Issue 4, October 2015, Pages 419–425
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