A1 Journal article (refereed), original research

Influence of laccase treatment on fouling layer formation in ultrafiltration of birch hot-water extract

Open Access publication

Publication Details
Authors: Virtanen Tiina, Lahti Jussi, Kalliola Anna, Tamminen Tarja, Mänttäri Mika, Kallioinen Mari
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Separation and Purification Technology
Volume number: 240
Start page: 116558
ISSN: 1383-5866
eISSN: 1873-3794
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe202002064752


Fouling problems caused by lignin have been limiting the use of membranes in the recovery of value-added materials from biorefinery streams. Fortunately, laccase-based catalytic pretreatments enable modification of lignin to the less fouling form. Because the mechanisms behind the fouling caused by ligneous compounds in wood-based streams are still not deeply understood, the aim of this study was to find out how laccase oxidation affects membrane fouling caused by pressurized hot-water extract. The effect of laccase on the fouling tendency of birch extract was explored both with adsorptive and pressure-driven experiments. The results suggested that laccase treatment increased the molar mass of lignin and improved significantly filtration capacity of commercial polyethersulphone membrane, possibly due to formation of less dense foulant layer during the filtration. Based on FTIR and BET results laccase oxidation decreased both adsorptive and pressure-driven fouling caused by lignin. However, decreases in pure water permeabilities were higher for the samples that were fouled with laccase treated extract. This may have originated from the transformation in the fouling mechanism from the pore narrowing to the pore blocking and could be prevented by the selection of a membrane with a different pore size.

Last updated on 2020-23-03 at 12:07