Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis

Tumelo Seadira, Jeffrey Baloyi, Mpfunzeni Raphulu, Richard Moutloali, Aoyi Ochieng

Research output: Contribution to conferencePaper

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.
Original languageEnglish
Pages7-13
Number of pages7
Publication statusPublished - 2014
Event2014 International Conference on Chemical Engineering & Advanced Computational Technologies - Pretoria, South Africa
Duration: Nov 24 2014Nov 25 2014

Conference

Conference2014 International Conference on Chemical Engineering & Advanced Computational Technologies
Abbreviated titleICCEACT’2014
CountrySouth Africa
CityPretoria
Period11/24/1411/25/14

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acid mine drainage
constructed wetland
heavy metal
kinetics
slurry
chromium
effluent
sulfate
acid
reactor

Cite this

Seadira, T., Baloyi, J., Raphulu, M., Moutloali, R., & Ochieng, A. (2014). Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis. 7-13. Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa.
Seadira, Tumelo ; Baloyi, Jeffrey ; Raphulu, Mpfunzeni ; Moutloali, Richard ; Ochieng, Aoyi. / Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis. Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa.7 p.
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Seadira, T, Baloyi, J, Raphulu, M, Moutloali, R & Ochieng, A 2014, 'Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis' Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa, 11/24/14 - 11/25/14, pp. 7-13.

Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis. / Seadira, Tumelo; Baloyi, Jeffrey; Raphulu, Mpfunzeni; Moutloali, Richard; Ochieng, Aoyi.

2014. 7-13 Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa.

Research output: Contribution to conferencePaper

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

ER -

Seadira T, Baloyi J, Raphulu M, Moutloali R, Ochieng A. Treatment of Cr(VI)-Laden Acid Mine Drainage Using Constructed Wetland and UV/TiO2 Photocatalysis. 2014. Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa.