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The objective of this study was to quantify the assimilable organic carbon (AOC) in processingwater at several stages of a full-scale nanofiltration (NF) water treatment plant. The NFmembrane plant investigated was a 45,400 m3/day (12 mgd) water softening facility at PlantationCity in southern Florida. The average AOC concentration of raw feed water was estimated at158 ug/L acetate-C. After pretreatment (acid and antiscalant addition), AOC levels increased by12.7%, suggesting that pretreatment chemicals used to control scaling may enhance biofoulingpotential. The results also demonstrated that nanofiltration was capable of effectively removing63.4% of AOC. A decrease in membrane productivity over time (declined linearly at a rate ofapproximately 1.3¿10-4 lmh/kPa per day) could be attributed primarily to biological fouling,which was evidenced by considerable AOC consumption (1.17 kg acetate-C per day) in themembrane system. Includes 23 references, tables, figures.

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Edition: Vol. - No. Published: 03/05/2003 Number of Pages: 17File Size: 1 file , 360 KB