Removal of Chromium (VI) and Chromium (III) by using Chlorella sp Immobilized at Electroplating Wastewater

Abstract

Heavy metals which is mostly contained in electroplating wastewater is Cr, in the form of Cr (VI) and Cr (III). Cr (III) is relatively unstable but tends to be dangerous, Cr (VI) is very stable and has a high level of toxicity which is dangerous for the environment. This study aims to determine the ability of microalgae Chorella sp immobilized with calcium alginate in removing metals Cr (VI) and Cr (III) in electroplating wastewater with variations cell density in beads 0; 1.53108; 1.76-107 and 1.54106 cells / bead, pH 3, 5, 7, and 9 with contact time 0; 12; 24; 36 and 48 hours. Allowance carried out by microalgae Chlorella sp immobilized in reducing Cr (VI) and Cr (III) metals in electroplating wastewater with initial concentrations of Cr (VI) 24.78 mg/l and Cr (III) 0.91 mg/l with highest efficiency value of 50.28% at pH 3, cell density 1.54106 cells/bead within 48 hours.