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Crossflow microfiltration of skimmed milk: impact of pre-treatments of milk and conduct of diafiltration on the performance of separation and the quality of the fractions

Abstract : Crossflow microfiltration of skimmed milk using 0.1 μm pore size is commonly used in dairy industry to separate casein micelles from serum proteins. However, the design (ceramic or polymeric membrane) and the conduct of this operation are not optimized due to the lake of performance data in the literature. The objective of this thesis is to provide knowledge to improve the performance of 0.1μm-microfiltration skimmed milk. We considered both the characteristics of skimmed milk to be microfiltered and the operating conditions of the operation. This work shows that the duration of cold-storage and the method for microbiological stabilization performed prior microfiltration impact the performance of the operation. The decrease of performance (transmembrane pressure, serum protein recovery) is attributed to the cumulative effect of bacteria/bacterial fragments and modifications of serum proteins (denaturation and aggregation). Performance of microfiltration using polymeric membrane are considerably improved (increase of permeation flux and transmission of serum proteins) using diafiltration mode with reverse osmosis water realized on concentrated retentate and with low transmembrane pressure. The modifications observed can be explained by changes on the properties of the fluid (viscosity) and of the deposit of casein micelles accumulated at the membrane (swelling). These results and the analyses of composition and functionalities of fractions obtained with ceramic and polymeric membranes highlight the real necessity, in the futur, of multi-objective optimization of skimmed milk microfiltration
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https://hal.inrae.fr/tel-03123270
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Submitted on : Wednesday, January 27, 2021 - 4:45:24 PM
Last modification on : Friday, February 5, 2021 - 3:58:35 AM

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  • HAL Id : tel-03123270, version 1

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Manon Granger-Delacroix. Crossflow microfiltration of skimmed milk: impact of pre-treatments of milk and conduct of diafiltration on the performance of separation and the quality of the fractions. Food engineering. AGROCAMPUS OUEST, 2020. English. ⟨tel-03123270⟩

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