Characterization of autotrophic and heterotrophic soluble microbial product (SMP) fractions from activated sludge

Xie, Wen-Ming, Ni, Bing-Jie, Seviour, Thomas, Sheng, Guo-Ping and Yu, Han-Qing (2012) Characterization of autotrophic and heterotrophic soluble microbial product (SMP) fractions from activated sludge. Water Research, 46 19: 6210-6217. doi:10.1016/j.watres.2012.02.046


Author Xie, Wen-Ming
Ni, Bing-Jie
Seviour, Thomas
Sheng, Guo-Ping
Yu, Han-Qing
Title Characterization of autotrophic and heterotrophic soluble microbial product (SMP) fractions from activated sludge
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2012-12-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2012.02.046
Volume 46
Issue 19
Start page 6210
End page 6217
Total pages 8
Place of publication London, United Kingdom
Publisher IWA Publishing
Collection year 2013
Language eng
Abstract Soluble microbial products (SMP) generated by microbial populations can adversely affect the efficiency of biological wastewater treatment systems and secondary effluent quality. In this work, both experimental and modeling approaches were used to investigate the formation of SMP by both heterotrophic and autotrophic bacteria. Strategies to control and reduce SMP in activated sludge systems were thus evaluated. SMP produced by heterotrophs were found to account for more than 92% of total SMP. The SMP produced by autotrophs contributed to less than 8% of the total SMP, with 5% attributable to the ammonia-oxidizing bacteria (AOB) and 3% to the nitrite-oxidizing bacteria (NOB). When external organic substrate was present, the utilization-associated products (UAP) were the main component of SMP. When external organic substrate was completely consumed, biomass-associated products (BAP) from the hydrolysis of extracellular polymeric substances (EPS) dominated the SMP. The model developed in this study described the fractions and dynamics of UAP and BAP produced by heterotrophs, AOB and NOB. Solids retention time of the reactor had a significant effect on SMP production, while the effect of the hydraulic retention time was only minor. Decreasing the solids retention time from 15 to 0.5 d reduced SMP production in the reactor by 62%.
Keyword Activated sludge
Heterotroph
Ammonia-oxidizing bacteria (AOB)
Modeling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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