Colloid‐Enhanced Ultrafiltration of Canola Oil: Effect of Process Conditions and MWCO on Flux, Fouling and Rejections
2015
Niazmand, Razieh | Razavi, Seyed Mohammad Ali | Farhoosh, Reza
In the present work, the efficiency of colloid‐enhanced ultrafiltration (CEUF) of canola oil miscella was investigated using an anionic surfactant (sodium dodecyl sulfate salt [SDS]), chelating agent (ethylenediaminetetraaceticacid [EDTA]), salt (calcium chloride [CaCl₂]) and two molecular weight cutoffs of hydrophobic (polyvinylidene fluoride) membranes (50 and 100 kDa). There were thicker fouled layer on both membrane surfaces for SDS‐ and EDTA‐pretreated samples. The flux reduction of M116 membrane was more than M183 membrane with the all samples except SDS added ones. It was observed that CEUF of EDTA‐ and SDS‐pretreated samples exhibited high efficiency in removing phosphorus. Increasing temperature from 25 to 55C improved the steady‐state permeate flux of SDS‐pretreated samples to extent of 13 kg/m²h. Furthermore, increasing pressure led to increase the permeate flux of pretreated sample except CaCl₂ adding ones. PRACTICAL APPLICATION: The small size of impurities of crude vegetable oils is a challenge of membrane refining, so increasing their size as a micelle or colloid by adding chemical agents may improve the separation. The knowledge of chemical agents behavior in relation to impurities as well as their impact on membrane performance such as flux, fouling and rejection will be benefit to decide for industrial applications. Also the information of effect of operation conditions changes such as temperature and pressure on membrane performance will be useful for operation controlling in micellar‐enhanced ultrafiltration in comparison with ultrafiltration.
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