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Causes and control of filamentous growth in aerobic granular sludge sequencing batch reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
14751 1245 2006 13 PDF Available
Title
Causes and control of filamentous growth in aerobic granular sludge sequencing batch reactors
Abstract

Poor long-term stability of aerobic granules developed in sequencing batch reactors (SBRs) remains a limitation to widespread use of aerobic granulation in treating wastewater. Filamentous growth has been commonly reported in aerobic granular sludge SBR. This review attempts to address the instability problem of aerobic granular sludge SBR from the perspective of filamentous growth in the system. The possible causes of filamentous growth are identified, including long retention times of solids, low substrate concentration in the liquid phase, high substrate gradient within the granule, dissolved oxygen deficiency in the granule, nutrient deficiency inside granule, temperature shift and flow patterns. Because of cyclic operation of aerobic granular sludge SBR and peculiarities of aerobic granules, various stresses can be present simultaneously and can result in progressive development of filamentous growth in aerobic granular sludge SBR. Overgrowth of filamentous bacteria under stress conditions appears to be a major cause of instability of aerobic granular sludge SBR. Specific recommendations are made for controlling filamentous growth.

Keywords
Aerobic granule; Sequencing batch reactor; Filamentous growth; Solids retention time; Kinetic selection
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Causes and control of filamentous growth in aerobic granular sludge sequencing batch reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biotechnology Advances - Volume 24, Issue 1, January–February 2006, Pages 115–127
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