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Effect of pH on nitrous oxide production and emissions from a partial nitritation reactor under oxygen-limited conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
34184 45008 2016 7 PDF Available
Title
Effect of pH on nitrous oxide production and emissions from a partial nitritation reactor under oxygen-limited conditions
Abstract

•In a PN reactor, N2O emissions decreased with the increase in initial pH.•N2O production inside sludge aggregates were quantified by using microelectrodes.•A decrease in pH led to increased N2O emissions from denitrification.

The effect of pH on nitrous oxide (N2O) emissions from a laboratory-scale partial nitritation sequencing batch reactor under oxygen-limited conditions was investigated from both macro- and microscopic viewpoints. During the aeration period of a single cycle, N2O emissions decreased when the initial pH increased from 7.5 to 8.5. By application of microelectrodes, N2O production was observed inside entire sludge aggregates, and it increased with decreasing pH from 8.5 to 7.0. At pH 8.0 and 8.5, N2O was mainly produced in the outer layer (<1000 μm) of sludge aggregates, where nitritation mainly occurred. At pH 7.0 and 7.5, N2O production was mainly observed in the inner layer (>1000 μm), where the dissolved oxygen was almost depleted, revealing that the dominant pathway here was denitrification. Under oxygen-limited conditions, a decrease in pH led to increased N2O emissions from denitrification pathway.

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Keywords
Partial nitritation; Sequencing batch reactor; Nitrous oxide; pH; Microelectrodes
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Effect of pH on nitrous oxide production and emissions from a partial nitritation reactor under oxygen-limited conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 51, Issue 6, June 2016, Pages 765–771
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