Build-up and relaxation of membrane fouling deposits produced during crossflow ultrafiltration of casein micelle dispersions at 12 °C and 42 °C probed by in situ SAXS

Abstract

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On the reversibility of membrane fouling by deposits produced during crossflow ultrafiltration of casein micelle suspensions

“…4b, the membrane shifted for 15-17 μm (same as in Ref. [62]), which was small compared to the lowest measured gel thickness. Because of this membrane shift, c(z) profiles measured at t R = 0 min are slightly higher as compared to the last profiles measured during the filtration stage (Fig.…”

“…This can be explained by an instant shift of the flexible polymeric filtration membrane away from the rigid membrane support due to the instant reduction of TMP [39,40,62] (although a low TMP of 10 kPa was maintained in order to reduce this effect during the pressure relaxation). The shift of the membrane towards positive z brought the inner sublayer of casein micelles, which was localized close to the membrane surface (z < 20 μm) and was not accounted for in the calculations of m t , m g and h g during the earlier filtration step, into the scope of SAXS analysis (z > 20 μm) [39,40,62], resulting in an apparent increase of m t , m g and h g . According to Fig.…”

“…It can also serve to analyze deposit behavior after the pressure release and to characterize deposit reversibility. For example, in a recent paper on SAXS-ultrafiltration of casein micelle suspensions at the constant pressure of 110 kPa [62] we proposed a method for semi-quantitative analysis of deposit swelling and removal and compared the influence of filtration temperature (12 • C versus 42 • C) on the deposit compressibility and its swelling kinetics during the pressure relaxation. Our current work continues the development of methodology for characterization of deposit properties with a focus on reversibility of deposit formation and compression.…”

Nanofiltration process monitoring and antioxidant activity analysis of skimmed milk samples

“…(Luo et al 2012) The changes in solvent viscosity and ion diffusivity (the so called mobilities) decrease and increase permeate concentration with increasing temperature respectively (22°C vs 50°C), meaning they partially cancel each other's effects (Roy and Lienhard 2019). Furthermore, membrane fouling by skim milk has been consistently caused primarily by proteins, with mineral fouling seen only on ceramic membranes (Ng et al 2017) The concentration polarization was much stronger at 42°C than at 12°C (Doudiès et al 2021) 1000kD PES membrane displayed improved flux and lower fouling at refrigeration temperatures than 0.1μm and 0.45μm membranes (Crowley et al 2015). DPPH scavenging activity.…”

Comparative Assessment of Tubular Ceramic, Spiral Wound, and Hollow Fiber Membrane Microfiltration Module Systems for Milk Protein Fractionation

“…Deposit formation strongly impairs flux and the desired high whey protein mass flow, which is a key aspect in milk protein fractionation [ 7 ]. Increased transmembrane pressure, ∆ p TM , leads to greater transport towards the membrane and results in the compaction of the layer of retained casein micelles deposited on the membrane surface, despite crossflow conditions [ 20 , 21 , 22 , 23 , 24 , 25 ], thereby reducing the porosity of the deposited layer. This creates additional steric resistance to the mass transport of whey proteins and, thus, results in a reduction of whey protein transmission [ 11 ].…”