Three alkali-thermophilic bacteria (two new species) producing catalases.
Hydrogen peroxide monitoring methods suitable for textile bleaching application.
Immobilised catalase enzymes stable at high pH and temperature.
Molecular and catalytic properties of catalases from two new bacterial strains.
A vertical and a horizontal reactor system for the continuous treatment of textile bleaching effluents.
New carrier materials for catalase immobilisation.
A combined process allowing reuse of enzyme treated bleaching effluents in dyeing.
Industrial evaluation: Process is economically attractive for effluent treatment for reuse in dyeing especially in continuous bleaching/washing.
The traditional textile wetting industry consumes about 100 litres of water to process about 1 kg of textile materials. Therefore there is a strong need for closed-loop technologies leading to a reduction in water consumption, especially since water resources in Southern European countries are limited. The objectives of this project are the development of enzymatic processes for on-site water treatment after textile bleaching and recycling of the same bath for further dyeing. Catalase enzymes will be used for hydrogen peroxide (H202) degradation in bleaching liquors as an environmentally benign alternative to chemicals, which lead to unfavourable high salt concentration in the process water. Currently there are no processes available using immobilised catalases, which would withstand the high-temperature and high-pH conditions used during textile processing and which would enable recycling of the enzymes. In the proposed basic research project the academic (UniP) and industrial (IndA+P) partners will work closely together to study the background for a continuous process meeting all those criteria. IndA experienced in enzyme technology will screen for suitable catalases from microbial origin and determine the molecular and kinetic properties of the isolated enzymes. Catalases acting at high temperatures and pH will be immobilised to enhance stabilities and enable recycling. UniP will develop an industrially applicable method to control the amount H202 in the baths. The textile engineers from UniP will evaluate the consequences of enzymatic H202 degradation on the subsequent dyeing process. They will also study in detail the properties of the immobilised catalases such as the kinetic of H202 degradation. On the base of these results a continuous lab-scale process for the degradation of H202 will be developed and hydraulic parameters will be optimised. Finally, IndP (textile company) will evaluate the process in industrial scale. Upon successful completion of the project a large-scale production process of the new product has to be developed. The implemented of enzymatic degradation of H202 would represent a major breakthrough in the textile industry the estimated saving of water being more than 50%.
Funding SchemeCSC - Cost-sharing contracts