On-Site Recovery of Hemicelluloses from Thermomechanical Pulp Mill Process Water by Microfiltration and Ultrafiltration

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Abstract

During mechanical defibration of wood, a minor fraction of the wood mass is dissolved in the process water. These dissolved substances represent an extra energy demand when they are treated in the mill’s wastewater treatment plant. Galactoglucomannan, the main hemicellulose in spruce, can be recovered from thermomechanical pulp mill process water by a process based on microfiltration (MF) and ultrafiltration (UF). The purpose of this work was to study the scale-up of the process from laboratory scale to continuous industrial scale. MF was first studied in the laboratory, and then combined with UF in a continuous pilot process on-site at a pulp mill. The data obtained were used to estimate the cost of the membrane processes for galactoglucomannan recovery which was found to be about €1160 per ton hemicelluloses.

Original languageEnglish
Pages (from-to)214-223
JournalJournal of Wood Chemistry and Technology
Volume39
Issue number3
Early online date2019 Feb 26
DOIs
Publication statusPublished - 2019

Subject classification (UKÄ)

  • Chemical Process Engineering
  • Water Engineering

Keywords

  • galactoglucomannan
  • hemicelluloses
  • Microfiltration
  • thermomechanical pulp
  • ultrafiltration

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