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

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

Chemical, Materials & Metallurgical Engineering

Research output: Contribution to conference › Paper › peer-review

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 language	English
Pages	7-13
Number of pages	7
Publication status	Published - 2014
Event	2014 International Conference on Chemical Engineering & Advanced Computational Technologies - Pretoria, South Africa Duration: Nov 24 2014 → Nov 25 2014

Conference

Conference	2014 International Conference on Chemical Engineering & Advanced Computational Technologies
Abbreviated title	ICCEACT’2014
Country	South Africa
City	Pretoria
Period	11/24/14 → 11/25/14

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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. 7-13. Paper presented at 2014 International Conference on Chemical Engineering & Advanced Computational Technologies, Pretoria, South Africa. http://iieng.org/images/proceedings_pdf/5762E1114009.pdf

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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",

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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. <http://iieng.org/images/proceedings_pdf/5762E1114009.pdf>

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 conference › Paper › peer-review

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

Y2 - 24 November 2014 through 25 November 2014

ER -