Development of an empirical model for fluoride removal from photovoltaic wastewater by electrocoagulation process

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Desalination and Water Treatment

Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/tdwt20

Development of an empirical model for fluoride

removal from photovoltaic wastewater by

electrocoagulation process

N. Drouiche ab_{, S. Aoudj}a_{, H. Lounici}b_{, H. Mahmoudi}c_{, N. Ghaffour}d_{& M.F.A.}

Goosen e

a _{Silicon Technology Development Unit (UDTS) 2 , Bd Frantz Fanon BP140, Alger – 7,} Merveilles , 16200 , Algeria Phone: +213 (21) 279880 ext 172 Fax: +213 (21) 279880 ext 172

b _{Laboratory of Environmental Biotechnologies , Ecole Polytechnique d’Alger , 10,} Avenue Pasteur, El-Harrach , Algeria

c _{Laboratory of Water and Environment , Hassiba Ben Bouali University , Chlef , Algeria} d _{Water Desalination & Reuse Centre , King Abdullah University of Science and}

Technology (KAUST) , Saudi Arabia

e _{Alfaisal University, Office of Research , Riyadh , Saudi Arabia} Published online: 03 Aug 2012.

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To cite this article: N. Drouiche , S. Aoudj , H. Lounici , H. Mahmoudi , N. Ghaffour & M.F.A. Goosen (2011) Development

of an empirical model for fluoride removal from photovoltaic wastewater by electrocoagulation process, Desalination and Water Treatment, 29:1-3, 96-102

To link to this article: http://dx.doi.org/10.5004/dwt.2011.1966

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Desalination and Water Treatment

www.deswater.com

29 (2011) 96–102 May

Development of an empirical model for fluoride removal

from photovoltaic wastewater by electrocoagulation process

N. Drouiche

a,b

_{*, S. Aoudj}

a

_{, H. Lounici}

b

_{, H. Mahmoudi}

c

_{, N. Ghaffour}

d

_{, M.F.A. Goosen}

e

a_{Silicon Technology Development Unit (UDTS) 2, Bd Frantz Fanon BP140, Alger – 7 Merveilles, 16200, Algeria}

Tel. +213 (21) 279880 ext 172; Fax +213 (21) 433511; email: nadjibdrouiche@yahoo.fr

b_{Laboratory of Environmental Biotechnologies, Ecole Polytechnique d’Alger, 10, Avenue Pasteur, El-Harrach, Algeria} c_{Laboratory of Water and Environment, Hassiba Ben Bouali University, Chlef, Algeria}

d_{Water Desalination & Reuse Centre, King Abdullah University of Science and Technology (KAUST), Saudi Arabia} e_{Alfaisal University, Office of Research, Riyadh, Saudi Arabia}

Received 21 April 2010; Accepted in revised form 14 November 2010

A B S

t r

AC

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Electrocoagulation experiments were conducted with bipolar aluminium electrodes to determine the optimum conditions for the fluoride removal from synthetic photovoltaic wastewater. A high fluoride concentration in community water supplies can cause fluorosis which has a detrimental

effect on human health in particular on teeth and bones. A full 23 _{factorial design of experiments}

was used to obtain the best conditions of fluoride removal from water solutions. The three factors considered were initial fluoride concentration, applied potential, and supporting electrolyte dos- age. Two levels for each factor were used; supporting electrolyte (0 and 100), applied potential (10 and 30 V), and initial fluoride concentration (20 and 25 mg/L). Results showed that the optimum conditions for fluoride removal from photovoltaic wastewater containing an initial fluoride concentration of 20 mg/L were a supporting electrolyte dose of 100 mg/L and an applied potential of 30 V. These gave a residual fluoride concentration of 8.6 mg/L which was below the standard discharge limit. A mathematical equation showing the relation between residual fluoride concentration and the effective variables was also developed.

Keywords: Photovoltaic wastewater; Electrocoagulation; Fluoride; Experimental design; Empirical