The objective of this project is to develop appropriate environmentally friendly
enzymatic deinking as a solution to deinking difficulties related to ink detachment.
Bio-deinking is an alternative to prevailing solutions requiring more chemicals and
After identification of these difficulties (responsible paper grades and printing
methods), and analysis of their origin (ink composition, nature of bonding between
ink and fibre surface), enzymes will be selected, purified and tested at laboratory
scale for deinking of woodfree and woodcontaining papers, printed with hard to
detach inks. The most promising results will be scaled up by producing larger
amounts of the selected enzymes, and by conducting pilot plant deinking in
continuous process. The effect of deinking enzymes on paper production rate and
paper quality, as well as on water system quality, will be evaluated.
Finally full scale mill trials will be performed taking into account the results of the
pilot plant trials, to get an overall evaluation of the proposed process.
Economic and environmental impacts of the proposed process will be evaluated.
Basic research, trials on pilot plant scale and industrial development will be
considered in he frame of the present project.
The consortium in charge of this projet includes all the skills necessary to reach the
objectives : four research institutes experienced in enzymology, papermaking
(recycling and deinking) and paper properties, an enzyme manufacturer, two
papermakers operating deinking plants using woodfree and woodcontaining raw
This project will contribute to the development of environmentally friendly
technologies : bio-deinking will help to reduce the amount of chemicals used for
deinking in the slushing stage. Bio-deinking could also be considered as an
alternative to hot dispersing (the most common solution to detach hard to detach
ink) and thus contribute to reduce thermal and mechanical energy consumption.
Another important consequence will be the reduction of dissolved material (COD),
in the effluents.
Funding SchemeCSC - Cost-sharing contracts
2628 VK Delft