Abstract
Abstract Treatment of Tehran refinery effluent, high in oil and grease (O&G), total organic carbon (TOC), and total dissolved solids (TDS), as boiler feedwater was proposed by a treatment scheme comprising microfiltration (MF), ultrafiltration (UF), and reverse osmosis (RO). To find optimum conditions for each membrane operation, effects of operating parameters such as transmembrane pressure (TMP), flow rate (Q), and temperature on permeation flux and TOC or TDS removal efficiencies were investigated. A tubular ceramic MF (α-Al2O3) membrane module was employed for treatment of oily wastewater before UF. The optimum operating condition was found as TMP of 1.25 bar, Q of 32.5 L min−1, and temperature of 32.5°C. MF reduced turbidity and solid particles content of the wastewater for UF. UF was investigated in this study to reduce turbidity and O&G of the wastewater prior to RO, which was necessary to reduce salinity to an acceptable level for using as boiler feedwater. The optimum UF experiments were found at...
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