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Effect of aeration rate on the emission of N2O in anoxic–aerobic sequencing batch reactors (A/O SBRs)

Paper ID Volume ID Publish Year Pages File Format Full-Text
21227 43212 2010 5 PDF Available
Title
Effect of aeration rate on the emission of N2O in anoxic–aerobic sequencing batch reactors (A/O SBRs)
Abstract

Nitrous oxide (N2O) is a significant greenhouse gas, and biological nitrogen removal systems have been shown to be a significant N2O source. To evaluate the control parameters for N2O emission in the wastewater treatment process, N2O emissions were compared in the activated sludge from anoxic–aerobic sequencing batch reactors (A/O SBRs) acclimated under different aeration rates, and fed with synthetic wastewater. Results showed that a higher aeration rate led to a smaller N2O emission, while reactors acclimated under mild aeration performed the best in terms of nitrogen removal efficiency. Most of the N2O was produced during the aerobic phase, regardless of the aeration rate. Trace studies showed that incomplete denitrification appeared to be the major process responsible for high N2O emission at a low aeration rate (Run 1), while incomplete nitrification was the reason for N2O emission at a higher aeration rate (Run 2 and Run 3). For enhancing the efficiency of nitrogen removal while lowering energy consumption and reducing N2O emission, the optimal aeration rate would be 2.7 Lair/(Lreactor · h), in terms of the synthetic wastewater used.

Keywords
Nitrous oxide; Greenhouse gas; Aeration rate; Anoxic–aerobic sequencing batch reactor; Nitrification and denitrification
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Effect of aeration rate on the emission of N2O in anoxic–aerobic sequencing batch reactors (A/O SBRs)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 109, Issue 5, May 2010, Pages 487–491
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