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Although the majority of the membrane WTWs comply with the design specifications, Suez-Environnement (SE) experience indicates that the fouling propensity of the feed water is not systemicallywell determined, which can limit the plant output and provides inadequate final water quality. Thus, theneed for further investigation of pretreatment processes or operational procedure to prevent membranefouling was identified as an area of interest for SE, which has to face this issue at a number of membraneplants. In that context, the objective of the project was to assess methods to improve the reliability for theoperation of existing ultrafiltration (UF) membrane water treatment facilities for various feed waters. This projectincluded the assessment of conventional pretreatment consisting of a clarification step and in-linecoagulation to reduce foulant contaminant and guarantee suitable final water quality. The integratedprocess including coagulation, settling and UF confirmed a significant improvement of the overallperformances of the membrane process albeit some difficulties encountered with membrane clogging andageing. The use of small doses of coagulant directly injected upstream the membrane, a process patentedby Degremont and called "Micro-coagulation", appeared also as an effective way to control fouling fromdissolved organic compounds and low water temperature. However, low removal of natural organicmatter throughout the process may limit the use of the micro-coagulation on water where disinfectionbyproducts are an issue. Includes 9 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2006 Number of Pages: 9File Size: 1 file , 720 KB