Abstract
Paper industry is a sector that generates large volumes of wastewater and sludge. There is a possibility to recover the cellulose contained in these effluents. Two tetrakis and imidazolium based commercial ionic liquids were used to recover the cellulose from industrial paper dried sludge. Both ionic liquids were able to recover the cellulose of the sludge (˜100%). The ratio sludge:ionic liquid had only a low influence on the recovery. The mass of cellulose recovered was the same for both ionic liquids. The tetrakis ionic liquid was able to clean the precipitate better, eliminating a major quantity of ashes. The imidazolium ionic liquid was able to leave a minor quantity of initial proteins in the precipitate. These encouraging results demonstrate that the recovery of cellulose from paper industry sludge is feasible with ionic liquids. But, improvement of the performances of the ionic liquids is necessary to allow a scale-up of the technology.
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