Mechanism and kinetics of biofilm growth process influenced by shear stress in sewers

Ai, Hainan, Xu, Jingwei, Huang, Wei, He, Qiang, Ni, Bingjie and Wang, Yinliang (2016) Mechanism and kinetics of biofilm growth process influenced by shear stress in sewers. Water Science and Technology, 73 7: 1572-1582. doi:10.2166/wst.2015.633

Author Ai, Hainan
Xu, Jingwei
Huang, Wei
He, Qiang
Ni, Bingjie
Wang, Yinliang
Title Mechanism and kinetics of biofilm growth process influenced by shear stress in sewers
Journal name Water Science and Technology   Check publisher's open access policy
ISSN 0273-1223
Publication date 2016-04-01
Year available 2016
Sub-type Article (original research)
DOI 10.2166/wst.2015.633
Open Access Status Not Open Access
Volume 73
Issue 7
Start page 1572
End page 1582
Total pages 11
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2017
Language eng
Abstract Sewer biofilms play an important role in the biotransformation of substances for methane and sulfide emission in sewer networks. The dynamic flows and the particular shear stress in sewers are the key factors determining the growth of the sewer biofilm. In this work, the development of sewer biofilm with varying shear stress is specifically investigated to gain a comprehensive understanding of the sewer biofilm dynamics. Sewer biofilms were cultivated in laboratory-scale gravity sewers under different hydraulic conditions with the corresponding shell stresses are 1.12 Pa, 1.29 Pa and 1.45 Pa, respectively. The evolution of the biofilm thickness were monitored using microelectrodes, and the variation in total solids (TS) and extracellular polymer substance (EPS) levels in the biofilm were also measured. The results showed that the steady-state biofilm thickness were highly related to the corresponding shear stresses with the biofilm thickness of 2.4± 0.1 mm, 2.7 ±0.1 mm and 2.2 ± 0.1 mm at shear stresses of 1.12 Pa, 1.29 Pa and 1.45 Pa, respectively, which the chemical oxygen demand concentration is 400 mg/L approximately. Based on these observations, a kinetic model for describing the development of sewer biofilms was developed and demonstrated to be capable of reproducing all the experimental data.
Keyword Biofilm thickness
Kinetic model
Shear stress
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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