Outside-in organic hollow fibers membranes filtration : an efficient alternative for isolation of high-added value compounds from fruit-based products? ROUQUIE Camille (PhD thesis 10/2015 – 10/2017) DAHDOUH Layal, DELALONDE Michèle, WISNIEWSKI Christelle
Issue
Current knowledge
Membrane filtration technologies are being increasingly used as a first extraction step to meet the growing demand for isolation and concentration of bioactive compounds from fruit-based products.
To date, outside-in organic hollow fibers (HF) membranes (largely implemented in water treatment) are rarely used for agro-food applications.
Nowadays, ceramic tubular membranes are mainly employed for micro- and ultrafiltration of food and beverage.
However, HF membranes could be an interesting alternative to conventionally used ceramic tubular membranes, as they may have several advantages: Low energy-consumption High exchange surface No change in particles size distribution Greater membrane material diversity Convenient handling
The main backdraw of these pressure-driven processes is the high energy-consumption. Moreover, the high shear applied during these filtration operations might modify the particles size distribution and subsquently the fouling propensity of the product to be filtered.
Objectives The aim of this project is to study the performance (productivity and selectivity) of outside-in organic HF membranes compared to inside-in ceramic tubular membranes for fruit-based products filtration.
Experimental strategy
Pomelo juice Grape pomace
Product characterization Physicochemical analysis
Biochemical analysis
pH, conductivity, turbidity, °Brix, titrable acidity, dry matter, suspended insoluble solids, rheological measurement, size distribution.
Bioactive compounds of interest depending on the product (e.g. polyphenols, anthocyanins, carotenoids, etc.)
Influence of physicochemical properties on the filterability behavior
Retention of specific compounds
Filtration test Pressurized dead-end filtration cell (Amicon®)
Selectivity
50 mL
Constant pressure 1.5 bars
With or without stirring 0 / 500 s-1 Polyethersulfone (PES) membrane - Alumina membrane Pore size or Molecular weight cut-off : 0.2µm / 0.1µm / 100kDa / 10kDa
Fouling mechanisms
Permeate mass evolution (g)
Hermia’s models
Surface : 17cm²
Permeability
Permeate flux J (m.s-1) versus time
Resistance to filtration R (m-1) versus time
Darcy’s law
Performance of outside-in organic HF membrane compared to inside-in ceramic tubular membrane Tubular ceramic membranes
Inside-out configuration Cross-flow mode
Hollow fiber organic membranes
Outside-in configuration “Dead-end” mode
Optimization of working conditions for each configuration and each product Comparison of productivity and selectivity performances
© CIRAD, April, 2016
PERSPECTIVES Depending on the results of this study, the HF technology might be extended to a wide range of agro-food applications if the following advatanges are confirmed: • Acceptable selectivity and productivity • Cost-effectivness in order to respect the hard work conditions in the Southern countries • Easiness of handling and maintenance of the filtration equipment
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