Effects of cycle time on properties of aerobic granules in sequencing batch airlift reactors

The granulation and properties of aerobic sludge were studied in two sequencing batch airlift reactors (SBARs). The synthetic wastewater in the two reactors had initially different levels of COD (400mgl super(-1 )in R1 and 1600mgl super(-1 )in R2). A hydraulic cycle time of 3 and 12h was conducted i...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2005-12, Vol.21 (8-9), p.1379-1384
Main Authors: FANG WANG, YANG, Feng-Lin, ZHANG, Xing-Wen, LIU, Yi-Hui, ZHANG, Han-Min, JUN ZHOU
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biotechnology
Chemical reactors
Cycle time
Fluid dynamics
Fluid flow
Fundamental and applied biological sciences. Psychology
Granular materials
Granulation
Granules
Hydraulics
Light microscopy
Microorganisms
Reactors
Sludge
Studies
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Summary:The granulation and properties of aerobic sludge were studied in two sequencing batch airlift reactors (SBARs). The synthetic wastewater in the two reactors had initially different levels of COD (400mgl super(-1 )in R1 and 1600mgl super(-1 )in R2). A hydraulic cycle time of 3 and 12h was conducted in the reactors R1 and R2, respectively and the process of granulation was observed by optical microscopy. It was found that the course of granulation at a cycle time of 3h in R1 was shorter than that at cycle time of 12h in R2 and the properties of aerobic granules were distinct in the reactors due to the different hydraulic cycle time. Under a cycle time of 3h, granule diameter was around 1.0-2.0mm, VSS ratio was 92.08% with stronger granule strength; under a cycle time of 12h, granule diameter was around 0.5-1.0mm, VSS ratio was 83.92% with weaker granule strength. In addition, the morphology of microorganisms in granules was obviously dissimilar when the hydraulic cycle time was different. It was concluded that the hydraulic cycle time plays a crucial role in the granulation and properties of aerobic granules. It is expected that the experimental findings will provide useful information on factors affecting aerobic granulation.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-005-5451-2