AWWA WQTC55188

AWWA WQTC55188 Method for Evaluating Antiscalants, as Applied to the Treatment of Water From the River Oise
Conference Proceeding by American Water Works Association, 01/01/2001

Plottu-Pecheux, Anne;Houssais, B.;Democrate, C.;Gatel, D.;Cavard, J.

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Nanofiltration was chosen as the final polishing step for the new Mery-sur-Oise Surface Water treatment plant. The main objective of this treatment was to remove natural organic (NOM) matter and pesticides. The new plant was started in the fall of 1999, raising the total capacity of the Mery-sur-Oise plant to 70 million gallons per day (mgd). Prior to nanofiltration, the treatment includes: ballasted flocculation and lamellar settling; ozonation; polyaluminum chloride addition; rapid dual-media filtration; and, microfiltration. The Oise River water is medium-hard (350 mgCaCOs.L-1), and the addition of an antiscalant proved necessary. The problem, which then occurred, was selecting the best product available on the market, or optimizing the dose for a given product. Several methodologies were tested to fulfill this need, giving poor results. This paper describes the methods used and results obtained with a pilot unit designed to allow antiscalant testing. Includes 14 references, tables, figures.