Understanding the operational problems and fouling characterization of RO membrane used for brackish water treatment via membrane autopsy

Abstract

An autopsy of spiral wound RO membrane operated in brackish water treatment was conducted to understand the origin and extent of foulants and fouling mechanisms. Structural and chemical characterization was determined by visual inspection and instrumental analysis such as SEM-EDS and XRD. It was observed that the membrane surfaces were completely covered with a gray/brown pollutant layer in all membrane sheets. SEM images proved accumulation of mineral pollutants on membrane surface. Also, the high levels of Al and Si which was attributed to aluminum silicates originating from feed water were determined on membrane surfaces. Additionally, the XRD analysis results showed that the foulant sample collected from membrane surfaces include halloysite, SiO2 and LiCl components. Fujiwara result proved that no damage was occurred on the membrane surface due to oxidation. Consequently, a fouling control strategy for RO-based brackish water treatment plants was also recommended to increase the membrane life.

The Effect of Organic Matter on Heavy Metals Removal from Simulated Wastewater using a Reverse Osmosis Membrane Process

“…One of the most useful methods for investigating membrane fouling and operational issues is a membrane autopsy, which provides information on the morphology and composition of fouling as well as the distribution of contaminants on the membrane surface. [23] Autopsies of fouled membranes have been performed in several studies to assess the kind and severity of fouling. For example, Balcik [23] used SEM-EDXS and XRD analyses to determine structural and chemical characteristics.…”

“…[23] Autopsies of fouled membranes have been performed in several studies to assess the kind and severity of fouling. For example, Balcik [23] used SEM-EDXS and XRD analyses to determine structural and chemical characteristics. They discovered that all surfaces of the membranes were fully overlaid by a gray brown contaminant film.…”

“…Understanding the origin and behavior of RO membrane fouling has been extensively studied. One of the most useful methods for investigating membrane fouling and operational issues is a membrane autopsy, which provides information on the morphology and composition of fouling as well as the distribution of contaminants on the membrane surface [23] . Autopsies of fouled membranes have been performed in several studies to assess the kind and severity of fouling.…”