Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB

Guo, Jianhua, Peng, Yongzhen, Wang, Zhongwei, Yuan, Zhiguo, Yang, Xiong and Wang, Shuying (2012) Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB. Water Research, 46 19: 6531-6542. doi:10.1016/j.watres.2012.09.037


Author Guo, Jianhua
Peng, Yongzhen
Wang, Zhongwei
Yuan, Zhiguo
Yang, Xiong
Wang, Shuying
Title Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2012-12
Sub-type Article (original research)
DOI 10.1016/j.watres.2012.09.037
Volume 46
Issue 19
Start page 6531
End page 6542
Total pages 12
Place of publication I W A Publishing
Publisher London, United Kingdom
Collection year 2013
Language eng
Abstract Filamentous bulking sludge due to excessive growth of filamentous bacteria is a serious operational problem in activated sludge plants. The addition of chemicals is one of widespread ways to control filamentous bulking. In this study, filamentous bulking in a continuous activated sludge system was found to be mainly caused by Eikelboom Type 021N filamentous bacteria likely due to low substrate concentration gradients. These Type 021N bacteria were found to be resistant to chlorination, maintaining cell integrity at a dosage of up to 80 mg Cl/gSS. An alternative biocidal agent, cetyltrimethyl ammonium bromide (CTAB), exhibited a much stronger biocidal effect on these filaments, which significantly improved sludge settleability. Type 021N with filamentous index of 5 was selectively killed, but floc-formers recovery their activity after CTAB termination. The study implied that CTAB might have more penetration capacity to cell wall of chlorine-resistant Type 021N bacteria. We therefore suggest the penetration property of filament cell wall should be considered or tested before the selection of biocide type in practice.
Keyword Filamentous bulking sludge
Filamentous bacteria
Type 021N
Chlorination
Cetyltrimethyl ammonium bromide (CTAB)
Activated sludge
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
 
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