Adsorption of iron and manganese from acid mine drainage using 4A–zeolite synthesised from waste with high kaolin concentrations
This research analysed the behaviour of heavy metals adsorption by zeolites and their associated applicability for treating acid mine drainage (AMD). The type 4A zeolite used was synthesised by a hydrothermal reaction using kaolin derived from the waste pulping process of white paper. For the development of kinetic studies of adsorption, samples were collected from AMD that were located in the southern State of Santa Catarina, Brazil. The optimal conditions for the removal of iron and manganese have been investigated by testing the adsorption, varying both the mass of zeolites used and adsorption times for a quantity of 1 litre of AMD. Adsorption studies have shown that in the first 15 minutes, approximately 80% of Fe was adsorbed. The adsorption of Mn was also efficient. Kinetic parameters were determined by the Langmuir isotherm, which allowed for the calculation of the theoretical adsorption of metals as a function of time.
Keywords: acid mine drainage, AMD, Langmuir isotherm, iron adsorption, manganese adsorption, zeolites, waste pulping, white paper, kaolin concentrations, heavy metals, kinetics, Brazil