Membrane treatment of oily wastewater from refinery processes

Abstract

Oily wastewater is produced in oil refining processes. This waste is usually treated by a number of physical, chemical, and biological techniques in water treatment units of oil refinery before being disposed in environment or reused as agricultural water. One of the treatment techniques for oil separation from wastewater is membrane filtration. This paper presents the performances of hydrophilic microfiltration (MF GRM) and ultrafiltration (UF GRM) polymeric membranes challenged with synthetic feed (gas oil dispersed in water) and oily wastewater effluent of American Petroleum Institute unit in refinery. A comparison was carried out under optimum conditions and in cross-flow mode in laboratory scale. The effects of operating parameters (i.e. pressure and cross-flow velocity) on flux and rejection were elucidated. The flux of MF GRM membrane for real feed within the first 2 h of filtration was low compared with synthetic feed because of the presence of solid and colloidal particles in the real feed. The oil rejection (around 99%) for synthetic feed was higher compared with real feed. Similar trend was found for both UF GRM and MF GRM membranes.

Electrospun fiber membranes from blends of poly(vinylidene fluoride) with fouling‐resistant zwitterionic copolymers

“…These two copolymers will be referred to by C‐SBMA and C‐SB2VP, which stand for “copolymer poly(MMA‐ ran ‐SBMA)” and “copolymer poly(MMA‐ ran ‐SB2VP)”, respectively. Copolymer composition was characterized using H NMR spectroscopy using a Bruker Avance III 500 spectrometer (Bruker Optics Inc., Billerica, Massachusetts). C‐SBMA contained 19 wt% SBMA, whereas C‐SB2VP contained 18 wt% SB2VP.…”

Preparation and characterization of TiO2/Pebax/(PSf‐PES) thin film nanocomposite membrane for humic acid removal from water

“…Therefore, the rejection is decreased with pressure at constant feed concentration . In a research of oil removal from water using membrane separation technique, Madaeni et al resulted that accumulation of oil droplets on the membrane surface caused decrease of hydrophilicity property on the surface that led to more pass of oil through the membrane and thus reduction of rejection.…”

A study of a polymeric membrane performance in an ultrafiltration system to use in industrial application

“…The rejection rate decreased with an increasing pressure. This behavior can be attributed to the permeation of oil droplets through gel layer and membrane surface under the presence of a high pressures [5,22,23].…”

“…Membrane technology in wastewater treatment has significant progress in recent years. There are four filtration methods: microfiltration (MF) [4,5], ultrafiltration (UF) [5,6], nanofiltration (NF), and reverse osmosis (RO) [2]. Membrane processes are widely employed due to their success in reducing effluent concentrations to as low as 5 mg/L.…”