Decolourization of melanoidin containing wastewater using South African coal fly ash

Journal article

Authors / Editors

Ochieng, Aoyi

Research Areas

ENGINEERING AND TECHNOLOGY (Frascati classification)

Publication Details

Subtitle: Decolourization of melanoidin containing wastewater using South African coal fly ash

Publisher: World Academy of Science, Engineering and Technology (WASET)

Publication year: 2010

Volume number: 4

Issue number: 1

ISSN: 2010-376X

eISSN: 2010-3778

Languages: English-United States (EN-US)

Abstract

Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m²/g and pore volume of 0.002245cm³/g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removalwas achieved around pH 6, whereas increasing sorbent mass from10g/L to 200 g/L enhanced colour reduction from 25% to 86% at 298K. Spontaneity of the process was suggested by negative Gibbs freeenergy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of errorfunctions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash hadmaximum sorption capacity of 53 mg/g and could thus be used as alow cost adsorbent in melanoidin removal.

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