Combination of activated carbon and crude enzyme that immobilized in alginate was developed immobilized enzyme to decolorize black liquor. Characterization of material and black liquor were analyzed by using SEM and FTIR. The study revealed that immobilized activated carbon-enzyme has high decolorization during the removal of black liquor. It has able to decolorize black liquor up to 97.7% for 5 hours. Further, it also reduced COD as 66.77%, pH 9, and TDS 7.42 g/L. Characterization of black liquor by using FTIR showed that the beads after treatment has addition of functional group such as C-O phenol at wave number 1220.94 cm-1 and C-O-C ether at wave number 1060.85 cm-1 from (C-O-C) ether. Characterization of immobilized activated carbon-enzyme by using SEM showed that this bead before treatment was more granulated than after treatment. After treatment, the bead surface was more homogeneous. Conclusively, immobilized activated carbon-enzyme is a high potential adsorption for the removal of black liquor.
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