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The influence of starvation phase on the properties and the development of aerobic granules

Paper ID Volume ID Publish Year Pages File Format Full-Text
18623 42728 2006 5 PDF Available
Title
The influence of starvation phase on the properties and the development of aerobic granules
Abstract

The current study was to evaluate the influence of starvation phase on surface negative charge, relative hydrophobicity, extra-cellular polymer substances (EPS) and the formation mechanism of aerobic granules. Granules with encouraging settling properties occurred in the reactor about 7 days after the inoculation. The surface negative charge decreased from 0.203 to 0.023 meq g VSS−1 and the relative hydrophobicity increased from 28.8 to 60.3% during the granulation period. Concentrations of protein and carbohydrate decreased from 18.0 to 7.1 and 7.0 to 2.9 mg g VSS−1, respectively in the first period. And from day 13, those values were observed in the range of 5.8–8.6 and 2.9–5.6 mg g VSS−1, respectively. The EPS especially protein concentrations well correlated with surface charge and relatively hydrophobicity. It was concluded that a reasonable amount of EPS should be controlled to form and maintain aerobic granules. It was proposed that aerobic granulation was initiated by starvation phase and then enhanced by anaerobic metabolism.

Keywords
Aerobic granules; Extra-cellular polymer substances; Facultative microorganisms; Granulation; Starvation phase; Activated sludge
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 38, Issue 5, 2 March 2006, Pages 670–674
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