Color removal from aqueous solution by biogas residual slurry

Abstract

The adsorption of Acid Brilliant Blue on biogas residual slurry has been investigated. The parameters studied include dye concentration, agitation time, adsorbent dosage and pH. The equilibrium data fit well with both the Langmuir and Freundlich models of adsorption isotherm. Maximum removal of 99% was observed at pH 2.56. Desorption studies indicate that the dye is solubilised in 50%(v/v) acetic acid to the extent of 59% and the remainder appears to be chemically complexed irreversibly to the adsorbent.