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Ecological manufacturing of deinked pulp using ozone


Industrial use of ozone as a bleaching agent for secondary fibre has already started commercial operation in the USA. European knowledge about secondary fibre ozone bleaching is based in laboratory trials and pilot tests. Industrial scale is missing and USA references are kept secret. The present Project intends to be a step forward in European knowledge by studying the ozone bleaching process of secondary fibre in its fundamentals and putting the achieved results into practice by installing a prototype reactor in an industrial paper-recycling mill. A detailed characterisation of the individual reactions of ozone with the main contaminants found in recycled paper such as colorants, ink and bacteria, will be done. Also, the effects of ozone in pulp properties and effluent characteristics will be analysed. These basic investigations will be completed by analysing material which will be gathered during the pilot tests in a pilot plant and in a prototype reactor to be installed in an industrial paper recycling mill.

Ozone treatment of pulps has two goals:
- Delignification and cocominant bleaching of chemical pulps;
- Improvement of the bonding potential of the fiber surfaces by introduction of hydrophilic groups Ozone bleaching is already practised in the pulp and paper industry. Also, operating with zero discharge has followers, including paper recyclers.

The degree of innovation to be achieved combines both Ozone bleaching of secondary fibres and Zero Liquid Effluent discharge, what is really innovative. The consequent problems and their nature are unknown, the solution of which offers the technical challenge and innovation.

As a result, following advantages are forecasted:
- extra low level of water consumption (from 10 m3/t pulp to 1.5 m3/t pulp);
- reduced needs of recirculated water treatment;
- extra energy savings (about 1.600.000 Kwh/year);
- low CO2 emissions (a reduction of 18000 ton/year);
- creation of a regular market for low quality waste papers and definitely giving a giant step towards recycling rate increase;
- decrease in the use of other chemicals leading to energy savings of about 8000 t fuel/year. The successful completion of the project will result in a new bleaching process for secondary fibre that will be more economical and ecology friendly than bleaching processes currently used in Europe. BE97-4659 03

Funding Scheme

CSC - Cost-sharing contracts


Km 3,Av. Professor Doutor Cavaco Silva, N 33, Talaide,t
2780920 Oeiras

Participants (5)

AquaAmbiente - Tratamento de Aguas e Sluçoes para o Ambiente SA
249,Estrada Outeiro De Polima, Lote B
2775 Parede
E & M Lamort SA
Rue De La Fontaine Ludot
51300 Vitry Le François
Chemin De La Porte Des Loges 1, Les Loges En Josa
78354 Jouy-en-josas
REFICEL - Sociedade de Recuperação deFibras Celulósicas SA
Quinta Do Caima
3850 Branca
Technische Universität Dresden
Pienner Strasse
01737 Tharandt