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Influence of substrate surface loading on the kinetic behaviour of aerobic granules

Influence of substrate surface loading on the kinetic behaviour of aerobic granules
Influence of substrate surface loading on the kinetic behaviour of aerobic granules
In the aerobic granular sludge reactor, the substrate loading is related to the size of the aerobic granules cultivated. This study investigated the influence of substrate surface loading on the growth and substrate-utilization kinetics of aerobic granules. Results showed that microbial surface growth rate and surface biodegradation rate are fairly related to the substrate surface loading by the Monod-type equation. In this study, both the theoretical maximum growth yield and the Pirt maintenance coefficient were determined. It was found that the estimated theoretical maximum growth yield of aerobic granules was as low as 0.2 g biomass g(-1) chemical oxygen demand (COD) and 10-40% of input substrate-COD was consumed through the maintenance metabolism, while experimental results further showed that the unit oxygen uptake by aerobic granules was 0.68 g oxygen g(-1) COD, which was much higher than that reported in activated sludge processes. Based on the growth yield and unit oxygen uptake determined, an oxidative assimilation equation of acetate-fed aerobic granules was derived; and this was confirmed by respirometric tests. In aerobic granular culture, about 74% of the input substrate-carbon was converted to carbon dioxide. The growth yield of aerobic granules was three times lower than that of activated sludge. It is likely that high carbon dioxide production is the main cause of the low growth yield of aerobic granules, indicating a possible energy uncoupling in aerobic granular culture
0175-7598
484-488
Liu, Yu
7aa0a5b8-dca4-4f81-b6c9-7332b1beb25c
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Wang, Zhi-Wu
5ed72239-d001-4d61-a846-a99444e44825
Yang, Shu-Fang
9eba8633-eb0d-45f6-815f-3b1cc07f1c25
Tay, Joo-Hwa
1bd3ce87-355e-460f-835b-56cb81f3a1b0
Liu, Yu
7aa0a5b8-dca4-4f81-b6c9-7332b1beb25c
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Wang, Zhi-Wu
5ed72239-d001-4d61-a846-a99444e44825
Yang, Shu-Fang
9eba8633-eb0d-45f6-815f-3b1cc07f1c25
Tay, Joo-Hwa
1bd3ce87-355e-460f-835b-56cb81f3a1b0

Liu, Yu, Liu, Yongqiang, Wang, Zhi-Wu, Yang, Shu-Fang and Tay, Joo-Hwa (2005) Influence of substrate surface loading on the kinetic behaviour of aerobic granules. Applied Microbiology and Biotechnology, 67 (4), 484-488. (doi:10.1007/s00253-004-1785-1). (PMID:15647939)

Record type: Article

Abstract

In the aerobic granular sludge reactor, the substrate loading is related to the size of the aerobic granules cultivated. This study investigated the influence of substrate surface loading on the growth and substrate-utilization kinetics of aerobic granules. Results showed that microbial surface growth rate and surface biodegradation rate are fairly related to the substrate surface loading by the Monod-type equation. In this study, both the theoretical maximum growth yield and the Pirt maintenance coefficient were determined. It was found that the estimated theoretical maximum growth yield of aerobic granules was as low as 0.2 g biomass g(-1) chemical oxygen demand (COD) and 10-40% of input substrate-COD was consumed through the maintenance metabolism, while experimental results further showed that the unit oxygen uptake by aerobic granules was 0.68 g oxygen g(-1) COD, which was much higher than that reported in activated sludge processes. Based on the growth yield and unit oxygen uptake determined, an oxidative assimilation equation of acetate-fed aerobic granules was derived; and this was confirmed by respirometric tests. In aerobic granular culture, about 74% of the input substrate-carbon was converted to carbon dioxide. The growth yield of aerobic granules was three times lower than that of activated sludge. It is likely that high carbon dioxide production is the main cause of the low growth yield of aerobic granules, indicating a possible energy uncoupling in aerobic granular culture

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More information

Published date: June 2005
Organisations: Water & Environmental Engineering Group

Identifiers

Local EPrints ID: 352836
URI: http://eprints.soton.ac.uk/id/eprint/352836
ISSN: 0175-7598
PURE UUID: 6591faa7-3dad-47d6-9f96-9fef15af238c
ORCID for Yongqiang Liu: ORCID iD orcid.org/0000-0001-9688-1786

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

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Contributors

Author: Yu Liu
Author: Yongqiang Liu ORCID iD
Author: Zhi-Wu Wang
Author: Shu-Fang Yang
Author: Joo-Hwa Tay

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