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Partial Nitritation of Raw Anaerobic Sludge Digester Liquor by Swim-Bed and Swim-Bed Activated Sludge Processes and Comparison of Their Sludge Characteristics

Paper ID Volume ID Publish Year Pages File Format Full-Text
21519 43226 2008 9 PDF Available
Title
Partial Nitritation of Raw Anaerobic Sludge Digester Liquor by Swim-Bed and Swim-Bed Activated Sludge Processes and Comparison of Their Sludge Characteristics
Abstract

This study evaluated performance of swim-bed (SB) reactors packed with a novel acrylic fiber carrier (BF) and swim-bed activated sludge (SBAS) reactor for partial nitritation of anaerobic sludge digester liquor from a municipal wastewater treatment plant. Comparison of characteristics of sludge obtained from both the reactors was also made. The average conversion rates of ammonium to nitrite were 52.3% and 40.0% under relatively high nitrogen loading rates over 3.0 kg-N/m3/d, respectively in two reactors. The average BOD5 removal efficiencies were 74.3% and 64.4%, respectively in the two reactors. The size of the sludge pellets taken from SB and SBAS reactors was found to be approximately three times (229 μm versus 88 μm) of that of the seed sludge. This sludge also had relatively high extracellular proteins levels indicating better sludge settling capability as compared to the sludge taken from SBAS reactor. Although the effluent nitrite/ammonium ratios had fluctuated in both reactor in some extent, the low dissolved oxygen concentration (average of 2.5 versus 0.35 mg/l), low suspended solids (average of 33.3 versus 33.5 mg/l), and about 50% ammonium conversion to nitrite demonstrated the application potential of anammox process for nitrogen removal.

Keywords
partial nitritation; anammox; anaerobic sludge digester liquor; nitrogen removal
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Partial Nitritation of Raw Anaerobic Sludge Digester Liquor by Swim-Bed and Swim-Bed Activated Sludge Processes and Comparison of Their Sludge Characteristics
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 106, Issue 5, November 2008, Pages 433–441
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