The application of colloidal gas aphrons in the recovery of fine cellulose fibres from paper mill wastewater

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    Abstract

    Colloidal gas aphrons (CGAs) are micron-sized gas bubbles of 25?30 µm in diameter produced by a high-speed stirrer in a vessel containing dilute surfactant solution. These bubbles, because of their small size, exhibit some colloidal properties. In this work, CGAs were used to separate fine fibres from a lean slurry of cellulosic pulp in a flotation column. The pulp fibres were recovered as foamate from the top. Sodium dodecyl sulphate at a concentration of 2.0 kg/m3 was used as a surfactant to generate the CGAs in a spinning disc apparatus. The results indicated that up to 70% flotation efficiency could be obtained within a short column height of 0.3?0.35 m. This technique can be applied to recover fine cellulosic pulp from paper-machine backwater.
    Original languageEnglish
    Pages (from-to)199-204
    Number of pages6
    JournalBioresource Technology
    Volume64 (3)
    Issue number3
    DOIs
    Publication statusPublished - Jun 1998

    Keywords

    • Agronomy and Crop Science
    • Food Science
    • Process Chemistry and Technology
    • Applied Microbiology and Biotechnology

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