Batik wastewater treatment using nano-micro bubble ozone has been carried out in this study. The batik wastewater used is rinsing wastewaster. The flow rate used in this study uses the best setting based on research data that has been done, which is 0.4 L/minute. Batik wastewater treatment was carried out for 300 minutes with sampling every 30 minutes. Waste samples were tested using UV-VIS to determine the absorbance value which indicates a decrease in waste parameters and the concentration of batik wastewater. The results showed that at 180 minutes, the waste had shown better color degradation which became clear and clean, then the treatment was continued for up to 300 minutes to obtain better parameter degradation. The removal efficiency is obtained by 74.43% and concentration of batik wastewater before treatment was 0.36 ppm. The EC, TDS, COD, and BOD parameters decreased significantly in proportion to the length of treatment, while the temperature increased with the length of treatment due to the pump engine getting hotter.

Keywords : advanced oxidation process, ozone, nano-micro bubble, batik wastewater.