Wine clarification with Rotating and Vibrating Filtration (RVF): Investigation of the impact of membrane material, wine composition and operating conditions

Abstract

For the first time in the literature, a shear enhanced process (or dynamic filtration) called Rotating and Vibrating Filtration (RVF technology) was investigated for wine clarification. The impact of membrane material (hydrophilic PES and hydrophobic PTFE with a cutoff of 0.2 mm), wine composition (filtered wine, FW and Crude simulated wine, CSW) and operating conditions (transmembrane pressure and rotational frequency) are reported. RVF module is characterized by a complex hydrodynamic generated by a 3 flat blades impeller in a confined cell. An additional driving force is generated by rotational frequency and is taken into account to calculate the apparent and real permeabilities. Filtered wine (FW) generates an irreversible fouling whatever hydrophilic or hydrophobic membrane material. Even if PES membranes performances (Lp 0 final ¼1670 L h À 1 m À 2 bar À 1) were higher compared to those of PTFE membranes (Lp 0 final ¼170 L h À 1 m À 2 bar À 1), nor rotational frequency (mechanical stress), nor water rinsing did significantly remove or reduce fouling but, on the contrary, favors its compression and membrane plugging. Crude simulated wine (CSW) includes pectins, tannins and mannoproteins. CSW filtration runs demonstrated a mechanical impact onto fouling reduction with PES and PTFE membranes. However mechanical efficiency is moderated by material properties which generated irreversible fouling with different magnitudes. PTFE and PES permeability gains stand for þ 34% and þ 300% respectively. Finally, a "critical frequency" is defined above which a permeability increase and hydraulic resistance reduction is induced by rotational frequency (22 and 30 Hz for PES and PTFE membranes respectively).

Fractionation of Nanoparticle Matter in Red Wines Using Asymmetrical Flow Field-Flow Fractionation

“… 18 , 19 Many efforts are used to control these macromolecules by means of purification and filtration techniques. 20 , 21 …”

Flow investigation in an innovating dynamic filtration module using tracing methods

“…In each device, the controls of local and global performances (permeability, fouling, limitations) are closely related to our knowledge of local and global hydrodynamic. The existing DF modules can be classified in terms of mechanical movement as cylindrical rotating filter (such as Biodruck-filter [1], Biopurification System [2], RDF filter [3]), rotating flat membrane filter (such as CRD filter [4], MSD filter [5], RDM module [6][7][8], DYNO filter [9], RVF module [10][11][12]), and vibrating filter (such as VSEP filter [13], VMF filter [14] and hollow fibber filter [15,16]).…”

“…It is designed for biological or food liquids. RVF module has been studied in the previous studies [10][11][12]19], it consists of two filtration cells in series (4 membranes, filtration area = 0.048 m 2 , cell volume = 0.2 L and RVF volume 1.48 L), and in each cell, a three-blade impeller (flat blade, d m = 138 mm, thickness = 8 mm) is driven by a central shaft continuously rotating (up to 50 Hz) in a 14 mm gap between two porous flat support (membrane support) which drains the permeate. It gives a 3 mm gap between the impeller and the membrane surface.…”

Fouling analysis and permeate quality evaluation of mulberry wine in microfiltration process

“…Fig. 3 illustrates the tting results of different pore blocking model derivations on the ltration data according to eqn (8)- (10). The model rate constants and regression coefficients are summarized in Table 3.…”