Cross-Flow Microfiltration of Oily Water using a Ceramic Membrane: Flux Decline and Oil Adsorption

Lue, Shingjiang Jessie; Chow, J.; Chien, Chin-Feng; Chen, Hsengshao

doi:10.1080/01496390903212714

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…More specifically, limited numbers of papers on tubular porous ceramic membranes have been reported for microfiltration or nanofiltration for oily/emulsion wastewater treatment − or for biodiesel purification . However, no prior work can be found on superhydrophobic porous ceramic/metallic tubular membranes for oil–water emulsion separations.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic or Hydrophilic Porous Metallic/Ceramic Tubular Membranes for Continuous Separations of Biodiesel–Water W/O and O/W Emulsions

Bischoff

Morales-Rodríguez

et al. 2019

Ind. Eng. Chem. Res.

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This paper reports the effective surface effect of porous inorganic membranes on improving the emulsion separations (i.e., perm-selective extraction of either oil phase or aqueous phase from the emulsions). A novel tubular form of superwetting, porous, stainless steel/ceramic membranes were demonstrated for enabling continuous separations of oil–water emulsions, extracting either oil phase or aqueous phase from the flowing emulsions. The superhydrophobic membranes consist of macroporous (4 μm) stainless-steel SS434 tube with inner wall surface modified with superhydrophobicity (>150° contact angle) via perfluoro-silane grafting functionalization. The (super)hydrophilic membranes consist of 4-μm porous stainless-steel SS434 tube without/with inner wall coated with nanoporous alumina (6 nm average pore size), the surface of which was further modified with superhydrophilicity via Hydrophil-S solution deposition. With the cross-flow membrane filtration setup, the surface-engineered tubular membranes were studied for perm-selective extraction of aqueous or oil phase from oil–water emulsions (water-in-oil W/O and oil-in-water O/W) that are relevant to a real industrial biodiesel (FAME) production process. The superhydrophobic membrane (4 μm pore size) has demonstrated capability of extracting nearly 100% pure oil while rejecting water phase when either W/O or O/W emulsions were tested as feed. The superhydrophobic membrane showed distinct advantage of 2-orders-of-magnitude-higher flux extraction of oil at 100 times higher “break-through” pressures. On the other hand, the super/hydrophilic nanoporous membranes (6 nm) have shown selective water permeation (separation factor up to 35) when biodiesel-relevant W/O emulsions were tested. Finally, the membrane function is discussed from the perspective of improving industrial biodiesel processing yield by overcoming equilibrium limitations during the biodiesel formation reactions. Future work on in situ reaction–separation experiments are envisioned.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic or Hydrophilic Porous Metallic/Ceramic Tubular Membranes for Continuous Separations of Biodiesel–Water W/O and O/W Emulsions

Bischoff

Morales-Rodríguez

et al. 2019

Ind. Eng. Chem. Res.

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“…times the cake resistance for dead end filtration compared to cross flow filtration mode (Choi et al, 2009b A study was carried out to investigate the fouling of MF using oil-water emulsion (Lue et al, 2009). The oil retention was as high as 99.5% and as the oil content in the feed increased, the flow resistance was increased and the flux was decreased.…”

Section: Filtrationmentioning

confidence: 99%