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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

46 Scopus Citations
View graph of relations

Author(s)

  • Jianhua Guo
  • Yongzhen Peng
  • Zhongwei Wang
  • Xiong Yang
  • Shuying Wang

Detail(s)

Original languageEnglish
Pages (from-to)6531-6542
Journal / PublicationWater Research
Volume46
Issue number19
Publication statusPublished - 1 Dec 2012
Externally publishedYes

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. © 2012.

Research Area(s)

  • Activated sludge, Cetyltrimethyl ammonium bromide (CTAB), Chlorination, Filamentous bacteria, Filamentous bulking sludge, Type 021N

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB. / Guo, Jianhua; Peng, Yongzhen; Wang, Zhongwei et al.
In: Water Research, Vol. 46, No. 19, 01.12.2012, p. 6531-6542.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review