Research output: Contribution to conference › Paper
Abstract
In the present paper, constructed wetland and ultraviolet (UV)/TiO2 photocatalysis processes were employed to treat acid mine drainage. Acid mine drainage samples were collected from Mpumalanga (South Africa) and they were characterized for heavy metals and sulphate concentrations. Unvegetated up-flow constructed wetlands were employed as pre-treatment in order to remove maximum concentrations of heavy metals, and a slurry photocatalytic reactor was used to reduce Cr(VI) in the acid mine drainage effluents from the constructed wetlands under optimum conditions. The maximum removal of total chromium achieved by all constructed wetlands was 65% after the optimum hydraulic retention time (HRT) of 5 days; and was 68% for Cr(VI) photocatalytic reduction after the optimum HRT of 3 hrs in a slurry photocatalytic reactor. The experimental data obtained were tested by first order and second order kinetic models. It was clearly demonstrated that the experimental data of Fe and Cr fit quite well first order kinetic model equation.
title = "Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis",
abstract = "In the present paper, constructed wetland and ultraviolet (UV)/TiO2 photocatalysis processes were employed to treat acid mine drainage. Acid mine drainage samples were collected from Mpumalanga (South Africa) and they were characterized for heavy metals and sulphate concentrations. Unvegetated up-flow constructed wetlands were employed as pre-treatment in order to remove maximum concentrations of heavy metals, and a slurryphotocatalytic reactor was used to reduce Cr(VI) in the acid minedrainage effluents from the constructed wetlands under optimum conditions. The maximum removal of total chromium achieved by all constructed wetlands was 65% after the optimum hydraulicretention time (HRT) of 5 days; and was 68% for Cr(VI) photocatalytic reduction after the optimum HRT of 3 hrs in a slurry photocatalytic reactor. The experimental data obtained were tested by first order and second order kinetic models. It was clearly demonstrated that the experimental data of Fe and Cr fit quite well first order kinetic model equation. ",
author = "Tumelo Seadira and Jeffrey Baloyi and Mpfunzeni Raphulu and Richard Moutloali and Aoyi Ochieng",
year = "2014",
language = "English",
pages = "7--13",
note = "2014 International Conference on Chemical Engineering & Advanced Computational Technologies, ICCEACT{\textquoteright}2014 ; Conference date: 24-11-2014 Through 25-11-2014",
2014. 7-13 Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa.
Research output: Contribution to conference › Paper
TY - CONF
T1 - Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis
AU - Seadira, Tumelo
AU - Baloyi, Jeffrey
AU - Raphulu, Mpfunzeni
AU - Moutloali, Richard
AU - Ochieng, Aoyi
PY - 2014
Y1 - 2014
N2 - In the present paper, constructed wetland and ultraviolet (UV)/TiO2 photocatalysis processes were employed to treat acid mine drainage. Acid mine drainage samples were collected from Mpumalanga (South Africa) and they were characterized for heavy metals and sulphate concentrations. Unvegetated up-flow constructed wetlands were employed as pre-treatment in order to remove maximum concentrations of heavy metals, and a slurryphotocatalytic reactor was used to reduce Cr(VI) in the acid minedrainage effluents from the constructed wetlands under optimum conditions. The maximum removal of total chromium achieved by all constructed wetlands was 65% after the optimum hydraulicretention time (HRT) of 5 days; and was 68% for Cr(VI) photocatalytic reduction after the optimum HRT of 3 hrs in a slurry photocatalytic reactor. The experimental data obtained were tested by first order and second order kinetic models. It was clearly demonstrated that the experimental data of Fe and Cr fit quite well first order kinetic model equation.
AB - In the present paper, constructed wetland and ultraviolet (UV)/TiO2 photocatalysis processes were employed to treat acid mine drainage. Acid mine drainage samples were collected from Mpumalanga (South Africa) and they were characterized for heavy metals and sulphate concentrations. Unvegetated up-flow constructed wetlands were employed as pre-treatment in order to remove maximum concentrations of heavy metals, and a slurryphotocatalytic reactor was used to reduce Cr(VI) in the acid minedrainage effluents from the constructed wetlands under optimum conditions. The maximum removal of total chromium achieved by all constructed wetlands was 65% after the optimum hydraulicretention time (HRT) of 5 days; and was 68% for Cr(VI) photocatalytic reduction after the optimum HRT of 3 hrs in a slurry photocatalytic reactor. The experimental data obtained were tested by first order and second order kinetic models. It was clearly demonstrated that the experimental data of Fe and Cr fit quite well first order kinetic model equation.
M3 - Paper
SP - 7
EP - 13
T2 - 2014 International Conference on Chemical Engineering & Advanced Computational Technologies