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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 11, No. 6, 2014, pp. 1653-1660
Bioline Code: st14161
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 11, No. 6, 2014, pp. 1653-1660

 en Simultaneous application of iron and aluminum anodes for nitrate removal: a comprehensive parametric study
Ghanbari, F.; Moradi, M.; Mohseni-Bandpei, A.; Gohari, F.; Mirtaleb Abkenar, T. & Aghayani, E.

Abstract

Exposure to high concentration of nitrate through drinking water poses a threat to human health and environment. Electrocoagulation (EC) is an alternative water treatment process that involves electrogeneration of coagulant agents. In the present study, EC was exerted for the nitrate removal in a batch reactor using aluminum and iron anodes simultaneously. The effects of the main parameters including electrical current, initial pH, NaCl dosage, initial nitrate concentration and presence of turbidity on NO3 - removal were investigated. NO2 - as a byproduct was monitored during electrolysis, and nitrate– nitrite index was calculated. The results indicated that optimum condition was pH of 5, 300 mA electrical current, 100 mg/L NaCl and electrolysis time of 40 min, under which removal efficiency was 81.5 %. Nitrite anion was generated during electrolysis of nitrate solution which increases nitrate–nitrite index at the first reaction time, and it was eliminated after 20-min electrolysis time. Reaction kinetic of nitrate removal in the absence and presence of turbidity was first-order and zero-order, respectively.

Keywords
Electrocoagulation; Nitrite; Turbidity effect; Al–Fe anodes

 
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