Estimating dosing rates and energy consumption for electrocoagulation using iron and aluminum electrodes / Zheng Gu in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3112–3117 Titre : Estimating dosing rates and energy consumption for electrocoagulation using iron and aluminum electrodes Type de document : texte imprimé Auteurs : Zheng Gu, Auteur ; Zhaohui Liao, Auteur ; Matthew Schulz, Auteur Année de publication : 2009 Article en page(s) : pp. 3112–3117 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Aluminum electrodes Iron Electrocoagulation reactor Chemical corrosion Résumé : The effect of current density on dosing rates and energy requirements for iron and aluminum electrodes in a bench-scale electrocoagulation (EC) reactor have been investigated. Dissolution rates of the iron and aluminum anodes were independent of bulk solution pH values. Iron dosing rates followed Faraday’s law, but aluminum dosing rates averaged 83% greater than those predicted by Faraday’s law. Chemical corrosion of both the anode and cathode contributed to the extra-faradaic aluminum dosing. A method was developed to determine the faradaic power consumption as a function of the current density. An equation describing power dissipation by ohmic and faradaic mechanisms was derived and used to estimate energy consumption per unit coagulant dose for EC reactors operating over a wide range of conditions. The derived equation can be used to compare the operational costs for EC with those using chemical additives, such as alum or ferric chloride. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801086c [article] Estimating dosing rates and energy consumption for electrocoagulation using iron and aluminum electrodes [texte imprimé] / Zheng Gu, Auteur ; Zhaohui Liao, Auteur ; Matthew Schulz, Auteur . - 2009 . - pp. 3112–3117. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3112–3117 Mots-clés : Aluminum electrodes Iron Electrocoagulation reactor Chemical corrosion Résumé : The effect of current density on dosing rates and energy requirements for iron and aluminum electrodes in a bench-scale electrocoagulation (EC) reactor have been investigated. Dissolution rates of the iron and aluminum anodes were independent of bulk solution pH values. Iron dosing rates followed Faraday’s law, but aluminum dosing rates averaged 83% greater than those predicted by Faraday’s law. Chemical corrosion of both the anode and cathode contributed to the extra-faradaic aluminum dosing. A method was developed to determine the faradaic power consumption as a function of the current density. An equation describing power dissipation by ohmic and faradaic mechanisms was derived and used to estimate energy consumption per unit coagulant dose for EC reactors operating over a wide range of conditions. The derived equation can be used to compare the operational costs for EC with those using chemical additives, such as alum or ferric chloride. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801086c

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