Abstract:
The purpose of this research was to study the application of the hybrid process consisted of adsorption and hydrocyclone for treating lignin which represented color of wastewater in paper industry. This work also used Alkali lignin to be wastewater and studied various parameters which affected the adsorption capacity and the separation performance of hydrocyclone. The results showed that the optimum operating condition for this hybrid process was a using of Filtrasorb 200 GACs with a particle size of 30x35 mesh for Alkali lignin removal. The adsorption isotherm of Alkali lignin could be represented by Freundlich isotherm. Moreover, in order to separate the applied GACs completely, a 30 mm diameter hydrocyclone with a 6 mm diameter apex was required for GACs separation at inlet pressure of 0.5 bar. However, due to the breaking of particle of adsorbent in hydrocyclone system would make the separations efficiency decreased, the efficiency of separation was approximately 95 percent. Subsequently, the selected condition was further applied in the continuous operation. In term of adsorption, the result showed that the concentration of Alkali lignin could be decreased by this system. At wastewater flow rate of 0.5 L/min, the system required adsorbent flow rate of more than 16.6 g/min to eliminate Alkali lignin concentration of less than 50 mg/l. Hence, it could be concluded that the hybrid system could be possibly operated for removing lignin from wastewater in paper industry.