[lic] Kemian tekniikan korkeakoulu / CHEM

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Browsing [lic] Kemian tekniikan korkeakoulu / CHEM by Subject "bakteeri"

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  • Interactions between bacteria and some papermaking components
    (2010) Leino, Taina
     School of Chemical Engineering | Licentiate thesis
    The aim of this thesis was a better understanding of the surface interactions between white water bacteria, Pseudoxanthomonas taiwanensis, and papermaking components, in order to make it possible to assess the importance of these interactions in papermaking processes. Flocculation of bacteria by cationic polyelectrolyte's in 0.01 M aqueous NaCl was investigated with electrophoretic mobility and turbidity measurements. The net charge of the bacteria was negative in a wide pH range. Cationic polyelectrolytes (poIyDADMAC, cationic polyacrylamide (C-PAM), cationic starch) adsorbed on the surface of the bacteria at pH 8. Polyelectrolytes functioning by bridging mechanism (C-PAM) were the most effective flocculants. Other polymers flocculated bacteria by charge neutralization. Thus, addition of typical retention polymers can flocculate bacteria and may attach them to the paper web. Adsorption of the bacteria and cationic polyelectrolytes on silica, cellulose, hemicellulose and extractive surfaces was investigated by quartz crystal microbalance with dissipation monitoring (QCM-D), atomic force microscope (AFM) and field emission scanning electron microscope (FESEM). Cationic polyacrylamide and poIyDADMAC increased bacterial adsorption on silica. The polyelectrolytes accumulated around the bacterial cells and prevented their aggregation on the surface at pH 8. The bacteria adsorbed on a cellulose surface as small aggregates in the presence of the polyelectrolyte. Hemicellulose (O-acetylgalactoglucomannan) promoted dramatically bacterial adsorption as large rafts on extractive surface at pH 4.7. Thus, bacterial adsorption on extractives may relate to pitch problems and biofilm formation in paper machine.