Use of enzymes for modification of dissolved and colloidal substances in process waters of mechanical pulping

Johanna Buchert, Annikka Mustranta, Peter Spetz, Rainer Ekman, Kari Luukko

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


During mechanical pulp production and bleaching wood components, such as extractives, carbohydrates and lignin are dissolved and dispersed into the process waters. These components are called dissolved and colloidal substances (DCS). DCS can accumulate during water circulation and can in turn affect paper machine runnability and also the strength and optical properties of the paper. In this work DCS fraction originating from TMP process were treated with enzymes acting on triglycerides, glucomannans, and lignin and the effect of enzymatic treatments on the water composition as well as sheet properties were evaluated. Lipases were found to modify the chemical structure of the extractives resulting in more hydrophilic fibre surface and subsequent improvement in the sheet strength properties. Mannanase treatment, on the other hand, destabilized pitch. As a result, aggregation of pitch to the fibres was observed. which in turn resulted in impaired strength properties. Laccase could effectively polymerize lignans and the reaction products seemed to be sorbed onto the fibres.
Original languageEnglish
Title of host publicationPre-symposium of the 10th ISWPC
Subtitle of host publicationRecent advances in paper science and technology
Place of PublicationSeoul
PublisherTAPPI Press
ISBN (Print)978-89-9505-200-6
Publication statusPublished - 1999
MoE publication typeB3 Non-refereed article in conference proceedings
EventPre-symposium of the 10th ISWPC: Recent Advances in Paper Science and Technology - Seoul, Korea, Republic of
Duration: 2 Jun 19994 Jun 1999


ConferencePre-symposium of the 10th ISWPC
Country/TerritoryKorea, Republic of


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