Growth, maintenance and product formation of autotrophs in activated sludge: Taking the nitrite-oxidizing bacteria as an example

Ni, Bing-Jie, Fang, Fang, Xie, Wen-Ming and Yu, Han-Qing (2008) Growth, maintenance and product formation of autotrophs in activated sludge: Taking the nitrite-oxidizing bacteria as an example. Water Research, 42 16: 4261-4270. doi:10.1016/j.watres.2008.06.024


Author Ni, Bing-Jie
Fang, Fang
Xie, Wen-Ming
Yu, Han-Qing
Title Growth, maintenance and product formation of autotrophs in activated sludge: Taking the nitrite-oxidizing bacteria as an example
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2008-10-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2008.06.024
Volume 42
Issue 16
Start page 4261
End page 4270
Total pages 10
Place of publication London United Kingdom
Publisher I W A Publishing
Language eng
Formatted abstract
The autotrophs in activated sludge play an important role in biological wastewater treatment, especially in the nitrification process. Compared with the heterotrophs in activated sludge, information about the growth, maintenance, and product formation of the autotrophs is still sparse. In this work both experimental and modeling approaches are used to investigate the growth, nitrite inhibition, maintenance, and formation of extracellular polymeric substances (EPS) and soluble microbial products (SMP) of the autotrophs, with nitrite-oxidizing bacteria (NOB) in activated sludge as an example. The unified theory for EPS and SMP is integrated into our model to describe the microbial product formation of the NOB. Extensive experiments were carried out using the NOB-enriched in a sequencing batch reactor for the calibration and validation of the developed model. Results show that the NOB spend a considerable amount of energy on maintenance processes. Their apparent growth yield is estimated to be 0.044 mg COD biomass mg−1 N. The model simulations reveal that the concentrations of EPS and SMP in the NOB-enriched culture initially increase, but later decrease gradually, and that the SMP formed in the nitrite oxidation process are biodegradable.
Keyword Activated sludge
Autotrophs
Extracellular polymeric substances (EPS)
Nitrite-oxidizing bacteria (NOB)
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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