Use of Electrocoagulation with Aluminum Electrodes to Reduce Hardness in Tunisian Phosphate Mining Process Water

This study evaluated electrocoagulation using Al electrodes for removal of non-carbonate hardness in phosphate mining process water. Examination of process parameters identified optimal conditions for hardness removal at pH 7, a NaCl concentration of 4 g/L, a current density of 22.2 mA/cm 2 , an int...

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Bibliographic Details
Published in:Mine water and the environment 2016-09, Vol.35 (3), p.310-317
Main Authors: Brahmi, Khaled, Bouguerra, Wided, Belhsan, Hamza, Elaloui, Elimame, Loungou, Mouna, Tlili, Zied, Hamrouni, Béchir
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Calcite
Carbonates
Coagulants
Coagulation
Current density
Earth and Environmental Science
Earth Sciences
Ecotoxicology
Electrocoagulation
Electrodes
Electrolysis
Geology
Hardness
Hydrogeology
Hydroxides
Industrial Pollution Prevention
Magnesium
Magnesium hydroxide
Mineral Resources
Mining
Parameter identification
pH effects
Phosphates
Process parameters
Process water
Removal
Retention time
Sodium chloride
Technical Article
Water hardness
Water Quality/Water Pollution
Water resources management
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Summary:This study evaluated electrocoagulation using Al electrodes for removal of non-carbonate hardness in phosphate mining process water. Examination of process parameters identified optimal conditions for hardness removal at pH 7, a NaCl concentration of 4 g/L, a current density of 22.2 mA/cm 2 , an inter-electrode distance of 2 cm, a stirring speed of 450 revolutions per minute, and a treatment time of 30 min. Production of primary coagulant during electrolysis improved removal of both calcite and magnesium hydroxide. The optimized hardness removal was highly efficient, with an overall removal rate of 83.8 % at 30 min of retention time.
ISSN:1025-9112
1616-1068
DOI:10.1007/s10230-015-0354-4