Abstract:
This research aimed to study the recycling process of laser-printed paper by using cellulase and hemicellulase enzyme, incorporated with nonionic surfactant (Tween-80) on flotation deinking of laser-printed paper. The studied factors were enzyme and surfactant dosages in the range of 0-0.15% and 1.0-2.0% (based on oven-dried pulp), respectively. The results showed that the deinking process using enzymes in conjunction with nonionic surfactant can enhance the removal of ink particles from laser-printed paper. The optimum conditions for deinking process are the dosages of enzyme and surfactant of 0.1% and 1.75% (based on oven-dried pulp), respectively. Subsequently, further study was to determine the optimal conditions for deinking by interaction of cellulose-hemicellulase enzyme. In the last study, a mixing ratio of both enzyme types was 1: 1 in conjunction with nonionic surfactant concentration 1.75% (based on oven-dried pulp). The results showed that the optimal conditions for deinking was used the dosages of each enzyme of 0.1% (based on oven-dried pulp), incorporated with surfactant concentration of 1.75% (based on oven-dried pulp) and flotation process.