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This slide presentation outlines a study on the comparative performance of high-rejection SWRO membranes. Specific study objectives included:evaluate performance of three commerciallyavailable, high rejection SWRO elements forboron and TTS removal;compare removal rates with projected datafrom supplier's software programs; and,estimate cost for feedwater alkalinization tomeet WHO standard. Topics outlined include: regulatory limits for boron; boron speciation in water, seawater, temperature effect, and salinity effect. An SWRO pilot plant is outlined and includes: experimental protocol; pilot configuration; reverse osmosis (RO) system with pH adjustment; manufacturer element specifications; RO System PerformancePermeate Boron Concentrations; manufacturer's projected permeateBoron versus Feed pH; manufacturer's projected permeateTDS versus Feed pH; SWRO TDS and Boron rejection; and, estimated cost of Boron compliance. Conclusions were:at ambient pH (8.0), only manufacturer A met permeateboron goal of 0.5 mg/L;feedwater alkalinization to pH 9.0 was required for allsuppliers to comply boron goal;TTS rejection was poor predictor of pH impact on boronrejection, all supplier's products show constant TTSrejection over range of feedwater pH values evaluated; and,estimated cost of feedwater alkalinization to pH 9.0 is$0.12/kgals of permeate. This represents an additionaloperating expense of 10%. Includes figures.

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Edition: Vol. - No. Published: 06/01/2006 Number of Pages: 24File Size: 1 file , 440 KB