Analysis of fouling resistances under dynamic membrane filtration

Abstract

The mechanisms of fouling in the ultrafiltration of polyethylene glycol (PEG) are analyzed using the complete blocking and the intermediate blocking Hermia´s models adapted to crossflow filtration. 1 The parameters of these models were theoretically

Analysis of the concentration polarization and fouling dynamic resistances under reverse osmosis membrane treatment of olive mill wastewater

“…4A, where it can be observed that the membrane fouling resistance, R f , increases with P TM for a constant v t . Similar results were reported by Choi et al and Vincent-Vela et al [39,46]. These results are supported by the concentration polarization and fouling resistances and the normalized values calculated and reported in Table 5, in particular the normalized fouling build-up rate values D(R f /R m )/Dt (min À1 ) which provide more precise information about the dynamic fouling build-up during the RO operation time under the different operating conditions assayed.…”

Electro-ultrafiltration to remove sodium dodecyl sulfate in proteins extracted for proteomics

“…However, a major operating problem for membrane ltration is concentration polarization, resulting in the buildup of solutes on the membrane surface, thereby reducing the separation efficiency. [23][24][25][26] In electro-ultraltration, the power of ltration is derived from an electric eld, which drives charged molecules to move through the solution. Moreover, the driving speed and directions differ for different molecules, depending on their charges, sizes, and masses.…”

Performance Modeling and Cost Analysis of a Pilot-Scale Reverse Osmosis Process for the Final Purification of Olive Mill Wastewater

“…The striking difference in the permeability coefficients between pure water and OMWST-2 (36.2%– 39.0% for N Re = 1.3 × 10 4 − 2.6 × 10 4 ) shall be attributed to concentration polarization and fouling resistance taking place on the boundary region of the RO membrane (Table 4) [25,26]. A guided focus on Table 4 permits us to note that reduction of the concentration polarization ( R CP ) on the RO membrane equal to 26.3% was provided upon an increment of the turbulence on the membrane to values of N Re = 2.6 × 10 4 .…”

“…Results withdrawn show a value of the pure water permeability coefficient ( K w ) of 1.41 L h −1 m −2 bar −1 , whereas K measured with the secondary-treated effluent (OMWST-2) was equal to 0.86 L h −1 m −2 bar −1 upon turbulent regime over the membrane (tangential velocity equal to v t = 2.55 m s −1 , corresponding to Reynolds number N Re = 1.3 × 10 4 ). The striking difference in the permeability coefficients between pure water and OMWST-2 (36.2%– 39.0% for N Re = 1.3 × 10 4 − 2.6 × 10 4 ) shall be attributed to concentration polarization and fouling resistance taking place on the boundary region of the RO membrane ( Table 4 ) [ 25 , 26 ]. A guided focus on Table 4 permits us to note that reduction of the concentration polarization ( R CP ) on the RO membrane equal to 26.3% was provided upon an increment of the turbulence on the membrane to values of N Re = 2.6 × 10 4 .…”