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Utilization patterns of volatile fatty acids in the denitrification reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
17973 42708 2007 6 PDF Available
Title
Utilization patterns of volatile fatty acids in the denitrification reaction
Abstract

This research investigated the utilization pattern of volatile fatty acids (VFAs) in the denitrification process. To be thorough, both synthetically produced and naturally generated VFAs were considered with the synthetic compounds being acetate, propionate and a mixture of these acids. The natural VFAs (acetate, propionate, butyrate and valerate) were produced from a laboratory-scale, completely mixed anaerobic digester. The wastewater used was a 1:1 mixture of municipal sludge and a potato-processing wastewater diluted to 5000 mg L−1 of total solids (TS). Steady-state, acidogenic conditions produced net VFAs of approximately 780 mg L−1. In addition, 36 denitrification experiments were conducted in 0.6 L batch reactors (18 using natural VFAs (the N-series) and 18 using synthetic VFAs (the S-series)). Nitrates completely disappeared and the average specific denitrification rate (kN) for the N-series (0.0111 g NO3−-N g VSS−1 d−1) was close to the mixture of the S-series (0.0134 g NO3−-N g VSS−1 d−1). Within the S-series, the kN value for acetate was more than double that of propionate reflecting a preference for acetate. The average specific carbon consumption rate (kC) for the N-series (0.0252 g VFA-C g VSS−1 d−1) was similar to the kC for the S-series (0.0248 g VFA-C g VSS−1 d−1). A hierarchy (acetate followed by butyrate followed by propionate) was evident when the kC rate was calculated on the basis of individual acids within the natural mixture. This hierarchy was also supported by the carbon consumption profiles.

Keywords
Acid-phase digestion; Volatile fatty acids; Denitrification; Carbon consumption; Specific rates; Utilization patterns
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 41, Issues 1–2, 2 July 2007, Pages 92–97
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