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The adsorbent of bioethanol black liquor sludge was used to adsorb acid red and acid orange dyes. The aim of this research is to obtain the decolorization the dyes with vaiation of adsorption time and adsorbent dose in dyes solution. The characterization of the adsorbent was determined using SEM and BET. The surface area of adsorbent from black liquor was 141.96 m2/g and a pore size of 2.06 nm, the surface morphology is porous, serrated, and rough. While the best adsorption time was 20-60 minutes in both dyes, the decolorization value was achieved up to 99%. The dominant isotherm adsorption was Langmuir isotherm, pseudo second-order kinetic models, and the maximum adsorption capacity is 10.56 mg/g on Acid Orange and 9.32mg/g on Acid Red. [ABSTRACT FROM AUTHOR]

The beverage industry wastewater contains high COD, TSS, and color. The development of efficient process treatment is needed to reduce the pollutant concentration from beverage industry wastewater. In this paper, the application of electrocoagulation and adsorption using activated carbon were investigated. The optimum conditions for electrocoagulation process were inter-electrode distance 2 cm, 12 voltage and monopolar arrangement which reduced color, COD, and TSS for 51.3, 56.3, and 70.2%, respectively. The further step was adsorption process with 10 g/L dose of powder activated carbon. It reduced color, COD, and TSS for 98.66, 92.15, and 90.12%, respectively. The results showed that electrocoagulation and adsorption could treat beverage industry wastewater into fulfilled the established quality standards. [ABSTRACT FROM AUTHOR]