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Aerobic granulation in sequencing batch reactors with different reactor height/diameter ratios

Paper ID Volume ID Publish Year Pages File Format Full-Text
17808 42697 2009 5 PDF Available
Title
Aerobic granulation in sequencing batch reactors with different reactor height/diameter ratios
Abstract

Effects of reactor height/diameter ratios ranged from 24 to 4 corresponding to reactor settling velocities from 12 to 2 m h−1 on aerobic granulation were investigated. It was found that granules appeared after 1-week operation and granule volume percentages exceeded 50% after 2–3 weeks in four reactors. In addition, similar granule fraction of 94–96% was found at steady state in all four reactors. Sludge volume index (SVI), average sludge size, biomass density and granule settling velocity at steady state were around 50 ml g−1, 1800 μm, 53 g l−1 and 40 m h−1, respectively, in four reactors. Extracellular polymeric substances (EPS) and specific oxygen uptake rate (SOUR) were around 38 mg g−1 VSS and 40 mg O2 g−1 VSS h−1, respectively. Denaturing gradient gel electrophoresis (DGGE) fingerprint of sludge in four reactors showed the same microbial population shift during the start-up period and same microbial community structure during steady-state period. These results recommended strongly that reactor height/diameter ratio or reactor setting velocity in the used range in this study did not affect granule formation, physical characteristics, microbial community structure of granules and stable operation of granular sludge reactor. Reactor height/diameter ratio thus can be very flexible in the practice, which is important for the application of aerobic granule technology.

Keywords
Aerobic granulation; Sequencing batch reactor; Column height/diameter ratio; PCR-DGGE; Reactor settling velocity
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Aerobic granulation in sequencing batch reactors with different reactor height/diameter ratios
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 45, Issue 5, 5 November 2009, Pages 379–383
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