on this topic are still being published in the bibliography .It seems clear that a better understanding of the membrane
cleaning step would contribute to the optimisation of the overall process efficiency . The cleaning procedure
should be as economically viable as possible. In addition,membranes used in food industries are cleaned also to satisfy
hygienics standards .Membrane cleaning methods are divided into chemical and physical. However, chemical processes are the most often used. Chemical cleaning agents include: alkalis, acids, metal chelating agents, surfactants, oxidizing agents and enzymes . It is important to note that a group of specific surfactants and alkaline solutions are commonly used to remove organic fouling. Sodium hydroxide solution and P3 Ultrasil 115 (Ecolab, Spain) were employed in this study. The cleaning solution must spread into the fouling layer and inside the pores acting by dissolution and then solubilization to remove the fouling layer from the membrane A key factor in the study of the membrane cleaning is the quantification
of the residual proteins on the membrane under severalcleaning conditions, as they are the main components of the membrane fouling .These works quantified the residual proteins on the membranes by FTIR–ATR. However, no studies comparing FTIR–ATR data with other methodologies like Pierce-BCA method after extraction have been found in the bibliography. Besides, a different procedure for determining the calibration line for quantifying proteins by FTIR– ATR is proposed. The main objective of this work was to study the influence of two cleaning reagents (P3-Ultrasil 115 and NaOH) on the cleaning efficiency in terms of permeability recovery, residual proteins on the membrane and membrane characteristics (contact angle). For it, membrane resistances in series approach has been applied to
permeate fluxes data. Besides, estimation of the deposited proteins on the membrane by FTIR–ATR and by Pierce-BCA method has been carried out.
on this topic are still being published in the bibliography .It seems clear that a better understanding of the membranecleaning step would contribute to the optimisation of the overall process efficiency . The cleaning procedureshould be as economically viable as possible. In addition,membranes used in food industries are cleaned also to satisfyhygienics standards .Membrane cleaning methods are divided into chemical and physical. However, chemical processes are the most often used. Chemical cleaning agents include: alkalis, acids, metal chelating agents, surfactants, oxidizing agents and enzymes . It is important to note that a group of specific surfactants and alkaline solutions are commonly used to remove organic fouling. Sodium hydroxide solution and P3 Ultrasil 115 (Ecolab, Spain) were employed in this study. The cleaning solution must spread into the fouling layer and inside the pores acting by dissolution and then solubilization to remove the fouling layer from the membrane A key factor in the study of the membrane cleaning is the quantificationof the residual proteins on the membrane under severalcleaning conditions, as they are the main components of the membrane fouling .These works quantified the residual proteins on the membranes by FTIR–ATR. However, no studies comparing FTIR–ATR data with other methodologies like Pierce-BCA method after extraction have been found in the bibliography. Besides, a different procedure for determining the calibration line for quantifying proteins by FTIR– ATR is proposed. The main objective of this work was to study the influence of two cleaning reagents (P3-Ultrasil 115 and NaOH) on the cleaning efficiency in terms of permeability recovery, residual proteins on the membrane and membrane characteristics (contact angle). For it, membrane resistances in series approach has been applied topermeate fluxes data. Besides, estimation of the deposited proteins on the membrane by FTIR–ATR and by Pierce-BCA method has been carried out.
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