engleski

Deinking possibilities in the reduction of mineral oil content from defined recovered paper grades

Mineral oils present in recycled paper are complex mixture of mineral oil saturated hydrocarbons (MOSH) and mineral oil aromatic hydrocarbons (MOAH), some of which can have carcinogenic and mutagenic properties. Mineral oils can be brought into the paper recycling loop through the use of the old newspapers and advertising brochures which contain mineral oil based printing inks. The mineral oil mixtures have the ability to migrate via the vapour phase into food contained in recycled packaging. In this study, three groups of recovered papers, chosen with respect to paper type and printing technique, were treated in laboratory conditions by means of two different deinking methods. Recovered papers consisting of old newspapers (ONP) printed with coldset inks, supercalendered (SC) papers printed by means of rotogravure and lightweight coated (LWC) papers printed with heatset inks were subjected to separate flotation deinking and adsorption deinking treatments. After each conducted deinking treatment, filter pads were prepared from corresponding deinked pulps and subsequently analyzed on the content of saturated and aromatic mineral oil hydrocarbons (MOSH, MOAH) by GC/FID measurements. Adsorption deinking is a novel method of ink removal from recovered paper slurries, developed at the Professorship for Paper Technology at the Dresden University of Technology. The principle of adsorption deinking is based on the ability of certain polymers to extract ink and other hydrophobic components from the pulp. In this deinking method the polymeric beads serve as a “dirt catcher” instead of air bubbles used in the flotation deinking. The aim of the study was to compare the effectiveness of two different deinking methods (adsorption deinking and flotation deinking) in the reduction of mineral oil hydrocarbons from defined recovered paper grades. For most tested samples adsorption deinking was found to be more successful in the reduction of mineral oils than the conventional flotation deinking method. Over 60% up to 80% of mineral oils were removed from recovered papers by means of adsorption deinking. It was also established that adsorption deinking was quite effective in the reduction of amounts of mineral oils even in cases when it was not efficient enough in removing printing ink particles from a recovered paper pulp.

mineral oil hydrocarbons; recycled paper; flotation deinking; adsorption deinking

Rad je odabran između 184 prijavljena rada za postersku prezentaciju na Forumu mladih znanstvenika iz područja šumarstva "COST - FTP Young Researchers’ Forum 2013". Na forumu je sudjelovalo 20 mladih znanstvenika s predavanjem, a njih 52 imalo je postersku prezentaciju.