WIT Press


Removal Of Sulphates From Acid Mine Drainage Using Desilicated Fly Ash Slag

Price

Free (open access)

Paper DOI

10.2495/WM160341

Volume

202

Pages

8

Page Range

383 - 390

Published

2016

Size

368 kb

Author(s)

F. Ntuli, T. Falayi, U. Thwanane

Abstract

The removal of sulphates from acid mine drainage (AMD) using desilicated fly ash (DFA) was investigated. The effects of DFA solid loading, residence time and removal temperature were investigated. A 2% DFA solid loading gave the highest sulphate removal of 75% at a temperature and residence time of 35°C and 90 min respectively. The maximum adsorption capacity for DFA was found to be 147.06 mg/g DFA. The sorption mechanism followed the Langmuir isotherm and pseudo second order kinetics. The Gibbs free energy and enthalpy for the sorption was found to be 17.26 and 125.096 J/mol respectively. This research showed that DFA was an attractive alternative adsorbent for sulphates in AMD.

Keywords

desilicated fly ash, adsorption, sulphates, isotherm