Photocatalytic Degradation of Aromatic Compounds in Abattoir Wastewater

By Ochieng Aoyi, Maurice S. Onyango and Thabo Brooms.

Published by The International Journal of Environmental Sustainability

Format Price
Article: Print $US10.00
Published online: December 20, 2016 $US5.00

In this study, photocatalytic degradation of p-cresol and dibutyl-phthalate (DBP) biorecalcitrant aromatic compounds in real abattoir wastewater was carried out. A modified polyaniline (PANI), PANI/TiO2/ZnO composite catalyst illuminated with 25 W UV-C lamp in an annular photoreactor, was used to catalyse the degradation process. The composite was prepared by “in situ” chemical oxidative polymerization of aniline. Characterization of the catalysts (TiO2 and ZnO) and their composites (TiO2/ZnO and PANI/TiO2/ZnO) was done using Fourier-transform infrared spectroscopy (FT-IR), powder x-ray diffraction (XRD), and thermogravimetric analyser (TGA). The photocatalytic process attained degradation of 93% and 73% for p-cresol and DBP, respectively, after ten hours of irradiation at a recirculation rate of forty-five ml/min. Furthermore, the reductions of chemical oxygen demand (COD) and total organic carbon (TOC) were 88% and 78%, respectively. The study has demonstrated that PANI/TiO2/ZnO composite has the capacity to effectively photodegrade aromatic organic compounds found in abattoir wastewater.

Keywords: Abattoir Wastewater, Aromatic Hydrocarbons, Photocatalytic Degradation, Polyaniline, TiO2, ZnO

The International Journal of Environmental Sustainability, Volume 13, Issue 1, pp.17-30. Article: Print (Spiral Bound). Published online: December 20, 2016 (Article: Electronic (PDF File; 815.628KB)).

Prof. Ochieng Aoyi

Director and Professor, Centre of Excellence, Vaal University of Technology, Vanderbijlpark, Gauteng, South Africa

Maurice S. Onyango

Professor and Head of Department, Chemical and Metallurgucal Engineering, Tshwane University of Technology, Pretoria, Gauteng, South Africa

Mr Thabo Brooms

PhD Student, Chemical and Metallurgucal Engineering, Tshwane University of Technology, Pretoria, Gauteng, South Africa