T. Falayi
Nov 1, 2019
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Journal
The Journal of Solid Waste Technology and Management
Abstract
Tetradecytrimethylammonium bromide (TDTMA) was used to modify the surface properties of desilicated fly ash (DFA). The objective was to improve the removal of sulphates from acid mine drainage using the TDTMA modified DFA (TDTMA-DFA). A 20% addition of TDTMA to DFA produced the optimum sulphate adsorbent. A 4% (m/v) solid loading of TDTMA-DFA was capable of removing over 98% of sulphates from AMD after agitation at 250 rpm and 45°C for 180 mins although equilibrium was reached after 80 mins. The mechanism of removal was chemisorption and the sulphate loaded TDTMA-DFA was stable against further leaching. The research gives an opportunity for the modification of a solid waste material (DFA) into a useful adsorbent thereby allowing a waste material to treat another waste which then supports a circular economy in a waste management system.