Oxidative treatment of paper mill effluent by TiO2 photocatalysis or photo-fenton reagent
Bulskaya, Ina Valery
Τα κύρια περιβαλλοντικά προβλήματα της βιομηχανίας χαρτιού και χαρτοπολτού είναι η παραγωγή χλωριούχων και άλλων τοξικών οργανικών ενώσεων, μερικές από τις οποίες είναι δύσκολες να βιοδιασπαστούν. Ο στόχος αυτής της μελέτηςήταν η ανάλυση πραγματικών αποβλήτων ώστε να βρεθεί η σύσταση του αποβλήτου και η απόδοση της επεξεργασίας εντός της μονάδας. Η φωτοκατάλυση προτείνεται ως πρόσθετη μέθοδος επεξεργασίας. Ο σκοπός των φωτοκαταλυτικών πειραμάτων ήταν να συγκρίνει την απόδοση της επεξεργασίας με photo-Fenton και με TiO2 και να προσδιοριστεί σε ποιο στάδιο της επεξεργασίας μπορεί να εφαρμοστεί η φωτοκατάλυση.
The pulp and paper industry has historically been one of the world’s largest consumers of freshwater resources and producers of wastewater discharges. These discharges have been the continuing focus of concern regarding their actual and potential environmental effects. More than 250 chemicals have been identified in effluents that are produced at different stages of papermaking. The most significant environmental issues are the discharge of chlorine-based organic compounds and of other toxic organics. Several organic compounds are resistant to biological degradation, especially color related compounds and compounds causing a high cationic demand. Depending on the quality of the paper that is produced, additional physical–chemical treatment may therefore be required. The goal of this study was to analyze the real wastewater from the paper mill and to suggest a method of additional treatment in order to reduce organic pollutants load, which is typically high for the industry. Photocatalysis was suggested as the method of additional treatment. The purpose of photocatalytic experiments was to investigate the efficiency of two most common for wastewater treatment photocatalytic processes – photo-TiO2 and photo-Fenton – for treatment of the real paper mill effluent and to compare the efficiency of the two processes and also the efficiency of TiO2 photocatalytic reactions with and without addition oh H2O2, and finally to investigate at which stage of treatment process photocatalysis can be employed. The investigated paper mill produces 3 grades of paper – toilet paper, kitchen paper and tissue. The mill uses long fibber, short fibber or chemic-thermo-mechanical pulps, which the mill does not produce itself. For the experiment a 500 mL pyrex UV reactor and a 125 W high-pressure mercury lamp, surrounded by pyrex filter blocking wavelengths below 290 nm, were used.
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