Skip to main content
Aller à la page d’accueil de la Commission européenne (s’ouvre dans une nouvelle fenêtre)
français fr
CORDIS - Résultats de la recherche de l’UE
CORDIS
Contenu archivé le 2024-04-16

ENHANCED UTILISATION OF RECYCLED PULP BY ENZYMATIC TREATMENT

Objectif

The aim is to use purified components of the cellulase and the hemicellulase systems of bacteria and fungi, produced commercially and in the laboratory, in order to identify those enzymes which effect desirable changes in the properties of the waste paper pulp. These changes include improved drainage, better de-inking properties and improved bleaching behaviour.
The project is to investigate possibilities of increasing the use of recycled waste paper for sanitary products and for printing paper, if further special treatments of waster pulps besides those of deinking and deashing can be used.

The recycling of pulps is limited to a few times because pulp fibres loose their flexibility after repeated use, resulting in a decreased efficiency of fibre fibre bonding during papermaking and an increase in Schopper-Riegler fineness. These undesirable effects lead to decreased efficiency of paper machines, such as reduced dewatering properties and high steam consumption. With repeated use the amounts of impurities such as ink colours, adhesives, filling agents and paper auxiliary agents increase.

With minimal weight loss of waster pulps certain cellulolytic and/or hemicellulolytic enzymes can specially hydrolyse the bonds and create new surfaces on pulp fibre for effective fibre fibre bonding. The whole enzyme spectra of cellulolytic microorganisms is not needed, because these are adapted for total hydrolysis. Only certain enzymes are selected in order to prevent damage of pulp fibres but to ensure the desired effects.
Enzyme addition for improvement of pulp quality is possible during the disintegration procedure (before de-inking) and after de-inking. Because enzymes may be affected by the de-inking chemicals (detergents, complexing agents, water glass, sodium hydroxide, peroxide) alternative enzyme addition is possible after de-inking. Both possibilities of enzyme involvement for upgrading of recycled pulp will be investigated.

The approach to the project work is divided into the following steps:

Collection of high and low quality pulps from 4 EC countries.
Physical and chemical characterization of different pulps.
Drainage performance test of recycled classified pulps after treatment with existing crude enzyme preparations.
Strength properties and chemical characterization from pulps with positive drainage performance.
Drainage performance test of recycled classified pulps with pure enzymes.
Strength properties of pulps treated with pure enzymes and characterisation of the solubles.
Fractionation of recycled classified pulps according to fibre length.
Chemical characterization of the fractions.
Provision of new substrates for screening of commercial enzyme products and new organisms: fine fraction from recycled pulp, differently substituted xylan fragments, native xylan and mannan, galectan.
Screening of commercial enzyme preparations for cellulases, mannanases and xylanases.
Screening of new organisms, particularly for accessory enzymes.
Production of enzymes.
Purification and characterization of enzymes.
Application of pure enzymes for upgrading of recycled pulps.
Large scale trials.

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: Le vocabulaire scientifique européen.

Vous devez vous identifier ou vous inscrire pour utiliser cette fonction

Programme(s)

Programmes de financement pluriannuels qui définissent les priorités de l’UE en matière de recherche et d’innovation.

Thème(s)

Les appels à propositions sont divisés en thèmes. Un thème définit un sujet ou un domaine spécifique dans le cadre duquel les candidats peuvent soumettre des propositions. La description d’un thème comprend sa portée spécifique et l’impact attendu du projet financé.

Données non disponibles

Appel à propositions

Procédure par laquelle les candidats sont invités à soumettre des propositions de projet en vue de bénéficier d’un financement de l’UE.

Données non disponibles

Régime de financement

Régime de financement (ou «type d’action») à l’intérieur d’un programme présentant des caractéristiques communes. Le régime de financement précise le champ d’application de ce qui est financé, le taux de remboursement, les critères d’évaluation spécifiques pour bénéficier du financement et les formes simplifiées de couverture des coûts, telles que les montants forfaitaires.

CSC - Cost-sharing contracts

Coordinateur

FEDERAL RESEARCH CENTRE FOR FORESTRY AND FOREST PRODUCTS
Contribution de l’UE
Aucune donnée
Adresse
Leuschnerstrasse 91
21031 HAMBURG
Allemagne

Voir sur la carte

Coût total

Les coûts totaux encourus par l’organisation concernée pour participer au projet, y compris les coûts directs et indirects. Ce montant est un sous-ensemble du budget global du projet.

Aucune donnée

Participants (5)

Mon livret 0 0