Semiconductor industry requires ultrapure chemicals to manufacture microelectronic devices. Hydrogen peroxide is one of the most demanded chemical by the semiconductor industry and ultrapurification processes are needed to achieve the electronic grade requirements for this chemical. Among all the ultrapurification alternatives, reverse osmosis emerges as the most desirable option according to e...

The desalination of seawater using reverse osmosis membranes is an attractive solution to global freshwater scarcity. However, membrane performance reduced by (bio)fouling. Membrane autopsies are essential for identifying the type fouling material, and applying corrective measures minimize fouling. Information from full-scale guiding improved plant operations scant in formal literature. In this...

Abstract Biofouling has been referred to as “the Achilles heel” of reverse osmosis (RO) membrane technology; the main cause being polyamide RO membranes lack chlorine tolerance. increases operating cost water treatment by increasing system feed pressure (i.e., energy demand) and cleaning frequency, which downtime reduces useful life. For waters with known high biofouling potential, plant design...

This study describes the removal of chromium from wastewater using pressure-driven membrane separation processes. It describes the rejection of trivalent chromium using a commercial membrane for reverse osmosis typed RO98pHt (Alfa Laval, Sweden). Model solutions of chromium were used for performing of separation experiments. The effects of feed pH, chromium concentration and temperature were in...

The aim of this study was to evaluate the performance a reverse osmosis (RO) membrane in surfactant removal using various model aqueous solutions. separation tests were performed with laboratory scale units dead-end configuration. Cellulose Acetate (CA) and Polyamide (PA) RO membranes used nonionic, anionic, or cationic surfactants at wide range concentrations. Membrane evaluated permeate flux ...