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This paper presents the results from a unique series of bench and pilot scaletests conducted in Southern California, designed to determine the effect of pretreatment onSeawater Reverse Osmosis (SWRO) performance. The two most commonly used pretreatmentschemes for SWRO - conventional pretreatment (coagulation/filtration) and membrane filtrationwere evaluated. Bench scale tests were conducted for optimization of coagulant dose forconventional pretreatment. A bench scale setup based on a modification of the Batch InternalRecycle Membrane Test (BAIReMT) developed by DiGiano et al (2000) was designed forscreening RO membranes. Additionally, size fractionation of the seawater was conducted andRO fouling experiments were performed using the above setup to determine the effect of varioussize fractions on reverse osmosis (RO) fouling. These size fractions can be related to different levels ofpretreatment commonly utilized for seawater RO. Pilot testing was conducted in two phases:Phase I testing focused on pretreatment evaluation, while Phase II was focused on RO evaluation.During Phase I two filter configurations and microfiltration were evaluated as pretreatmentstrategies. In the second phase of pilot testing two RO systems were operated simultaneously toevaluate the effect of the pretreatments on RO fouling under different operating conditions and source water types. Includes 10 references, tables, figures.

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Edition: Vol. - No. Published: 06/17/2005 Number of Pages: 17File Size: 1 file , 480 KB