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Shear-induced detachment of biofilms from hollow fiber silicone membranes

Authors

  • Z. Huang,

    1. School of Civil Engineering, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907; telephone: 765-494-2256; fax: (979) 845-6156
    2. Bindley Bioscience Center, Physiological Sensing Facility, Purdue University, West Lafayette, IN
    3. Birck Nanotechnology Center, Purdue University, West Lafayette, IN
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  • E.S. McLamore,

    1. Agricultural and Biological Engineering Department, University of Florida,Gainesville, FL
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  • H.S. Chuang,

    1. Department of Mechanical Engineering, Purdue University, West Lafayette, IN
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  • W. Zhang,

    1. Department of Civil Engineering, University of Arkansas, Fayetteville, AR
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  • S. Wereley,

    1. Birck Nanotechnology Center, Purdue University, West Lafayette, IN
    2. Department of Mechanical Engineering, Purdue University, West Lafayette, IN
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  • J.L.C. Leon,

    1. Agricultural and Biological Engineering Department, University of Florida,Gainesville, FL
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  • M.K. Banks

    Corresponding author
    1. School of Civil Engineering, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907; telephone: 765-494-2256; fax: (979) 845-6156
    2. Bindley Bioscience Center, Physiological Sensing Facility, Purdue University, West Lafayette, IN
    3. Birck Nanotechnology Center, Purdue University, West Lafayette, IN
    • School of Civil Engineering, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907; telephone: 765-494-2256; fax: (979) 845-6156
    Search for more papers by this author

Abstract

A suite of techniques was utilized to evaluate the correlation between biofilm physiology, fluid-induced shear stress, and detachment in hollow fiber membrane aerated bioreactors. Two monoculture species biofilms were grown on silicone fibers in a hollow fiber membrane aerated bioreactors (HfMBR) to assess detachment under laminar fluid flow conditions. Both physiology (biofilm thickness and roughness) and nutrient mass transport data indicated the presence of a steady state mature biofilm after 3 weeks of development. Surface shear stress proved to be an important parameter for predicting passive detachment for the two biofilms. The average shear stress at the surface of Nitrosomonas europaea biofilms (54.5 ± 3.2 mPa) was approximately 20% higher than for Pseudomonas aeruginosa biofilms (45.8 ± 7.7 mPa), resulting in higher biomass detachment. No significant difference in shear stress was measured between immature and mature biofilms of the same species. There was a significant difference in detached biomass for immature vs. mature biofilms in both species. However, there was no difference in detachment rate between the two species. Biotechnol. Bioeng. 2013; 110: 525–534. © 2012 Wiley Periodicals, Inc.

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