Evaluation of bacterial pretreatment of spruce woodchips for mechanical pulping

Anne Kallioinen, Matti Siika-aho, Jaakko Pere, Anu Vaari, Liisa Viikari

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)


    Properties of woody raw materials for papermaking can be modified by microbial pretreatments. In this work, the growth conditions of a Pseudomonas marginalis strain, which efficiently reduces extractives in Norway spruce, were studied in more detail. Additional nitrogen was necessary for efficient growth of P. marginalis on the chips, whereas the sterilisation of the woodchips was not required for growth and for reduction of extractives content. The effects of P. marginalis pretreatment on the energy consumption in refining and on the paper properties of the pulp produced were investigated. No energy savings in refining were observed, but the tensile strength of the handsheets was improved. Evidently this was due to the removal of extractives in chip pretreatment.
    Original languageEnglish
    Pages (from-to)488 - 492
    Number of pages5
    JournalAppita Journal
    Issue number6
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed


    • Norway spruce
    • wood extractives
    • biopulping
    • mechanical pulping
    • tensile strength


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