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Influence of cycle time on kinetic behaviors of steady-state aerobic granules in sequencing batch reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
17903 42704 2007 7 PDF Available
Title
Influence of cycle time on kinetic behaviors of steady-state aerobic granules in sequencing batch reactors
Abstract

To investigate kinetic behaviors of aerobic granules under different cycle times, we cultivated aerobic granules in sequencing batch reactors R1, R2, and R3 with cycle time of 1.5, 4, and 8 h, respectively. After the three reactors reached the steady state, we found that granules in R1 with a cycle time of 1.5 h were the biggest while the most compact granules with density of 74.6 g l−1 was produced in reactor R2 with a cycle time of 4 h. Both granule density and granule size greatly influenced the specific COD removal rate (qs) and the specific oxygen uptake rate (SOUR) because of the mass transfer limitation in granules. However, the difference of COD removal rate by different granules could be neglected in aerobic granular reactor as 1000 mg l−1 of influent COD was depleted during 30 min by the biomass with high concentration in the reactor. Furthermore, we found that the observed specific biomass growth rate (μobs) of granular sludge decreased from 0.266 to 0.031 d−1 while the observed biomass growth yield (Yobs) of granular sludge decreased from 0.316 to 0.063 g VSS g−1 COD when cycle time varied from 1.5 to 8 h. Both μobs and Yobs had good linear relationships with organic loading rate (OLR). However, the high μobs with cycle time of 1.5 h would be harmful to the long-term stability of aerobic granules although OLR and reactor treating capacity could be enhanced greatly by shortening cycle time. In addition, high effluent biomass concentration and high Yobs with short cycle time would burden the sedimentation tanks and the sludge disposal. The balance between advantages and disadvantages by using short cycle time thus should be considered. The results in this study can be applied for the process design and optimization of biological wastewater treatment with aerobic granules.

Keywords
Aerobic granules; Cycle time; Kinetic behaviors; Biomass yield; Sequencing batch reactor
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Influence of cycle time on kinetic behaviors of steady-state aerobic granules in sequencing batch reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 41, Issue 4, 3 September 2007, Pages 516–522
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