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Eduardo Castex, Argentina

De Angelis L.,Institutotecnologico Of Buenos Aires | De Cortalezzi M.M.F.,Institutotecnologico Of Buenos Aires | De Cortalezzi M.M.F.,CONICET
Separation and Purification Technology | Year: 2013

A comparative assessment of iron oxide ceramic ultrafiltration membranes fouling by model organic compounds was performed. To characterize this fouling phenomenon, humic acid (HA), bovine serum albumin (BSA) and sodium alginate (SA) were used as models of humic substances, proteins and polysaccharides respectively. Clean and fouled iron oxide membranes surfaces were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The influence of concentration, foulant mixtures and pH on the fouling mechanism was investigated. Fouling was observed to depend first on foulant-membrane interactions, followed by a second step where membrane material plays a less important role. Membrane surface chemistry and solution pH were significant factors affecting irreversibility of the fouling layer. A strong dependence was observed in foulant concentration and solution pH. Foulant mixtures showed synergetic results, determined by foulant-foulant interactions. © 2013 Elsevier B.V. All rights reserved. Source


De Angelis L.,Institutotecnologico Of Buenos Aires | de Cortalezzi M.M.F.,Institutotecnologico Of Buenos Aires | de Cortalezzi M.M.F.,University of Missouri
Journal of Membrane Science | Year: 2016

Fenton reactions were applied to the degradation of dissolved organic matter (OM) and fouling removal of iron oxide membranes. Humic acid (HA), bovine serum albumin (BSA) and sodium alginate (SA), were used as models of humic substances, proteins and polysaccharides respectively. The degradation reaction was performed with H2O2 1mM at pH of 2.5 and the reactant concentration was measured over time by total organic carbon (TOC) and HPLC. Dissolved and particulate iron were efficient catalyst, achieving mineralization rates of 80%, 40% and 85% for HA, BSA and SA respectively. The H2O2 solution was applied as a cleaning agent on membranes previously fouled by the compounds individually, as well as their mixtures. Hydraulic cleaning of the membrane surfaces did not show significant improvement; Fenton treatment produced a flow recovery of 97% for HA, 86% for BSA and 88% for SA. Flux recovery was slightly lower for mixtures, where chemical interactions between foulants yielded a more compact, recalcitrant layer. Membrane surfaces were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), showing residual foulants after treatment, regardless of the flux recovery achieved. The results showed the cleaning ability of this reagent with a very good recovery of the initial flux. © 2015 Elsevier B.V. Source

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