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  • 1. Hamit-Eminovski, Jildiz
    et al.
    Eskilsson, Krister
    Arnebrant, Thomas
    Malmö högskola, Faculty of Health and Society (HS).
    Change in surface properties of Microthrix parvicella upon addition of polyaluminium chloride as characterized by atomic force microscopy2010In: Biofouling (Print), ISSN 0892-7014, E-ISSN 1029-2454, Vol. 26, no 3, p. 323-331Article in journal (Refereed)
    Abstract [en]

    The filamentous bacterium Microthrix parvicella causes severe separation and foaming problems at wastewater treatment plants (WWTPs). An effective control of the bacterium in activated sludge WWTPs can be accomplished by dosage with polyaluminium chloride (PAX-14). The purpose of this study was to investigate whether addition of PAX-14 affects surface properties such as the hydrophobicity of the bacterium and to study the exopolymers of M. parvicella that host surface-associated enzymes. To this end, force measurements by atomic force microscopy were carried out to measure the interactions between hydrophilic and hydrophobized tips and the bacterium surface. Addition of PAX-14 caused no changes in the hydrophobicity of the bacterium surface but the data indicate that it collapsed the polymeric layer likely due to electrostatic screening. It is concluded that the collapse of the polymeric layer may affect the transport of substrates (eg free fatty acids) to the bacterium and hence the competitiveness of M. parvicella compared to the other bacteria present in activated sludge.

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