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Variable aeration in sequencing batch reactor with aerobic granular sludge

Variable aeration in sequencing batch reactor with aerobic granular sludge
Variable aeration in sequencing batch reactor with aerobic granular sludge
This study investigated the effects of reduced aeration in famine period on the performance of sequencing batch reactor (SBR) with aerobic granular sludge. Aerobic granules were first cultivated in two SBRs (R1 and R2) with acetate as sole carbon source. From operation day 27, aeration rate in R1 was reduced from 1.66 to 0.55 cm s?1 from 110 min to the end of each cycle and further reduced from 30 min to the end of each cycle from day 63. R2 as a control was operated with a constant aeration rate of 1.66 cm s?1 in the whole cycle during the entire experimental period. Results showed that changing trends of SVI, concentration, average size and VSS/SS of biomass with time in R1 and R2 were similar although different aeration modes were adopted. At steady state, SVI of aerobic granules and biomass concentration maintained at about 40 ml g?1 and 6 g l?1, respectively. Average size of granules was about 750 ?m in R1 while 550 ?m in R2. This is the first study to demonstrate that aerobic granular sludge could be stable at reduced aeration rate in famine period during more than 3-month operation. Such an operation strategy with reduced aeration rate will lead to a significant reduction of energy consumption, which makes the aerobic granular sludge technology more competitive over conventional activated sludge process. Furthermore, the stability of aerobic granular system with variable aeration further indicates that the difference of physiology and kinetics of aerobic granule in feast and famine periods results in the different requirements of oxygen and shear stress for the stability of granules, which will deepen the understanding of mechanism of aerobic granulation in sequencing batch reactor.
aerobic granules, aeration rate, feast period, famine period, mass transfer, shear stress
0168-1656
338-346
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Tay, Joo-Hwa
1bd3ce87-355e-460f-835b-56cb81f3a1b0
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Tay, Joo-Hwa
1bd3ce87-355e-460f-835b-56cb81f3a1b0

Liu, Yong-Qiang and Tay, Joo-Hwa (2006) Variable aeration in sequencing batch reactor with aerobic granular sludge. Journal of Biotechnology, 124 (2), 338-346. (doi:10.1016/j.jbiotec.2005.12.037).

Record type: Article

Abstract

This study investigated the effects of reduced aeration in famine period on the performance of sequencing batch reactor (SBR) with aerobic granular sludge. Aerobic granules were first cultivated in two SBRs (R1 and R2) with acetate as sole carbon source. From operation day 27, aeration rate in R1 was reduced from 1.66 to 0.55 cm s?1 from 110 min to the end of each cycle and further reduced from 30 min to the end of each cycle from day 63. R2 as a control was operated with a constant aeration rate of 1.66 cm s?1 in the whole cycle during the entire experimental period. Results showed that changing trends of SVI, concentration, average size and VSS/SS of biomass with time in R1 and R2 were similar although different aeration modes were adopted. At steady state, SVI of aerobic granules and biomass concentration maintained at about 40 ml g?1 and 6 g l?1, respectively. Average size of granules was about 750 ?m in R1 while 550 ?m in R2. This is the first study to demonstrate that aerobic granular sludge could be stable at reduced aeration rate in famine period during more than 3-month operation. Such an operation strategy with reduced aeration rate will lead to a significant reduction of energy consumption, which makes the aerobic granular sludge technology more competitive over conventional activated sludge process. Furthermore, the stability of aerobic granular system with variable aeration further indicates that the difference of physiology and kinetics of aerobic granule in feast and famine periods results in the different requirements of oxygen and shear stress for the stability of granules, which will deepen the understanding of mechanism of aerobic granulation in sequencing batch reactor.

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More information

Published date: July 2006
Keywords: aerobic granules, aeration rate, feast period, famine period, mass transfer, shear stress
Organisations: Water & Environmental Engineering Group

Identifiers

Local EPrints ID: 352833
URI: http://eprints.soton.ac.uk/id/eprint/352833
ISSN: 0168-1656
PURE UUID: 5d3e382a-b199-4437-bcca-d96947c8aa2b
ORCID for Yong-Qiang Liu: ORCID iD orcid.org/0000-0001-9688-1786

Catalogue record

Date deposited: 17 Jun 2013 14:19
Last modified: 15 Mar 2024 03:47

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Contributors

Author: Yong-Qiang Liu ORCID iD
Author: Joo-Hwa Tay

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