Absorption of indigosol dye waste from batik home industry at ex redlight district, Dolly, Surabaya using activated carbon

Research on adsorption of indigosol batik dye waste that derived from batik home industry from ex redlight district, Dolly, Surabaya using activated carbon has been done. The variation of contact time and adsorbent dosage was optimized. This research was conducted by a batch method. The contact time was varied from 10-70 minutes. The adsorbents dosage was varied from 2-14 mg/25 mL. The dilution factor was varied from 160-240 for initial concentration. This research was aimed to obtain the optimum conditions of indigosol adsorption onto activated carbon. Spectrophotometer UV-Vis shows that the equilibrium of indigosol adsorption by activated carbon was achieved at 50 minutes contact time. In addition, the highest indigosol removal by the addition of 10 mg activated carbon in 25 mL indigosol solution with the dilution factor of 200 for initial concentration. The result, 72,73% was optimum indigosol removal. From the analysis results, it can be concluded that the optimum conditions for indigosol adsorption using activated carbon were achieved at 50 minutes contact time with an adsorbent dosage of 10 mg/25 mL and the dilution factor was 200 for initial concentration.