Evaluating sludge minimization caused by predation and viral infection based on the extended activated sludge model No. 2d

Hao, Xiaodi, Wang, Qilin, Cao, Yali and van Loosdrecht, Mark C. M. (2011) Evaluating sludge minimization caused by predation and viral infection based on the extended activated sludge model No. 2d. Water Research, 45 16: 5130-5140. doi:10.1016/j.watres.2011.07.013


Author Hao, Xiaodi
Wang, Qilin
Cao, Yali
van Loosdrecht, Mark C. M.
Title Evaluating sludge minimization caused by predation and viral infection based on the extended activated sludge model No. 2d
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2011-10-15
Sub-type Article (original research)
DOI 10.1016/j.watres.2011.07.013
Volume 45
Issue 16
Start page 5130
End page 5140
Total pages 11
Place of publication London, United Kingdom
Publisher IWA Publishing
Collection year 2012
Language eng
Abstract The Activated Sludge Model No. 2d (ASM2d) was extended to incorporate the processes of both predation and viral infection. The extended model was used to evaluate the contributions of predation and viral infection to sludge minimization in a sequencing batch reactor (SBR) system enriching polyphosphate-accumulating organisms (PAOs). Three individual decay processes formulated according to the general model rules were used in the extended model. The model was firstly calibrated and validated by different experimental results. It was used to evaluate the potential extent of predation and viral infection on sludge minimization. Simulations indicate that predation contributes roughly two times more to sludge minimization than viral infection in the SBR system enriching PAOs. The sensitivity analyses of the selected key parameters reveal that there are thresholds on both predation and viral infection rates, if they are too large a minimal sludge retention time is obtained and the effluent quality is deteriorating. Due to the thresholds, the contributions of predation and viral infection to sludge minimization are limited to a maximal extent of about 21% and 9%, respectively. However, it should be noted that the parameters concerning predation and viral infection were not calibrated separately by independent experiment in our study due to the lack of an effective method, especially for the parameters regarding viral infection. Therefore, it is essential to better evaluate these parameters in the future.
Keyword Predation
Viral infection
Sludge minimization
Polyphosphate-accumulating organisms (PAOs)
Sequencing batch reactor (SBR) system
Activated sludge model No. 2d (ASM2d)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Advanced Water Management Centre Publications
 
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