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The Mery-sur-Oise water treatment plant (France), operated by Veolia Water on the behalfof the Syndicat des Eaux d'Ile de France (SEDIF), has used nanofiltration (NF)membranes to produce safe drinking water since 1999. However, significant fouling has beenobserved according to seasonal conditions, even with several types of pretreatment includingconventional surface water treatment followed by ozonation, acid injection, antiscalantaddition and microfiltration. The objective of this study was to characterize and identify the nature of foulantsresponsible for flux declines and higher pressure drop, and to monitor themembranes' performance after 9 years of operation.Since 2002, several membrane autopsies were performed each year on NF modules extractedfrom the first and the third stages of the Mery-sur-Oise nanofiltration unit.Several analytical tools such as FT-IR (Fourier Transformed Infra Red) spectroscopy, LCUV-COD (Liquid Chromatography coupled with UVsub254 nm/sub and Organic Carbon Detectors),SEM (Scanning Electron Microscopy) and TOC (Total Organic Carbon) measurements havebeen used to extensively characterize the fouling layer. Feedwater quality parameters(organic, inorganic and microbiological compositions) were also monitored continuously.The different analyses show that fouling results mainly from the formation of a biofilm onthe membrane surface. Significant variations are observed between the two stages: the amountand the composition of the deposit differ. Includes figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 7File Size: 1 file , 760 KB