Investigation of removal of anthocyanin in turnip juice wastewater by using different adsorbents

Abstract

The aim of this study is to eliminate the colour pigment of anthocyanin in the composition of turnip juice under different experimental conditions using low cost adsorbents (eggshells, pumpkin seed hulls, almond shells, black–green–red tea wastes, natural clay material). For this purpose, a series of discrete adsorption experiments were performed. Contact time for each set of experiments, adsorbent amount, mixing speed and temperature were fixed at 30\xa0min, 2\xa0g, 150\xa0rpm and 20\xa0°C. The effects of pH change of wastewater (acidic-neutral-basic) on colour removal and adsorption process were examined. The most important advantage of using such adsorbents is their ability to solve colour pollution problem as effective and economical adsorption. As a result of the studies, the colour parameter of the anthocyanins was removed from the wastewater at a low rate (14.08%).