Effect of long term anaerobic and intermittent anaerobic/aerobic starvation on aerobic granules

Pijuan, Maite, Werner, Ursula and Yuan, Zhiguo (2009) Effect of long term anaerobic and intermittent anaerobic/aerobic starvation on aerobic granules. WATER RESEARCH, 43 14: 3622-3632. doi:10.1016/j.watres.2009.05.007


Author Pijuan, Maite
Werner, Ursula
Yuan, Zhiguo
Title Effect of long term anaerobic and intermittent anaerobic/aerobic starvation on aerobic granules
Journal name WATER RESEARCH   Check publisher's open access policy
ISSN 0043-1354
Publication date 2009-08-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.watres.2009.05.007
Open Access Status Not yet assessed
Volume 43
Issue 14
Start page 3622
End page 3632
Total pages 10
Editor David Dixon
Jean-Claude Block
Mogens Henze
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
Abstract The effect of long term anaerobic and intermittent anaerobic/aerobic starvation on the structure and activity of aerobic granules was studied. Aerobic granular sludge treating abattoir wastewater and achieving high levels of nutrient removal was subjected to 4-5 week starvation under anaerobic and intermittent anaerobic/aerobic conditions. Microscopic pictures of granules at the beginning of the starvation period presented a round and compact surface morphology with a much defined external perimeter. Under both starvation conditions, the morphology changed at the end of starvation with the external border of the granules surrounded by floppy materials. The loss of granular compactness was faster and more pronounced under anaerobic/aerobic starvation conditions. The release of Ca(2+) at the onset of anaerobic/aerobic starvation suggests a degradation of extracellular polymeric substances. The activity of ammonia oxidizing bacteria was reduced by 20 and 36% during anaerobic and intermittent anaerobic/aerobic starvation, respectively. When fresh wastewater was reintroduced, the granules recovered their initial morphology within 1 week of normal operation and the nutrient removal activity recovered fully in 3 weeks. The results show that both anaerobic and intermittent anaerobic/aerobic conditions are suitable for maintaining granule structure and activity during starvation.
Keyword Aerobic granules
EXTRACELLULAR POLYMERIC SUBSTANCES
Starvation
morphology
Calcium
Nitrification
enhanced biological
phosphorous removal
recovery
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 03 Sep 2009, 17:41:04 EST by Mr Andrew Martlew on behalf of Advanced Water Management Centre