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Water Science & Technology: Water Supply Vol 1 No 4 pp 89–94 © IWA Publishing 2001

Characterization of suspended particles and deposits in drinking water reservoirs

V. Gauthier*, J.M. Portal**, J. Yvon***, C. Rosin****, J.C. Block*****, V. Lahoussine******, S. Benabdallah*******, J. Cavard********, D. Gatel********* and S. Fass**********

*LSE-LCPE UMR Université-CNRS 7564, Faculté de Pharmacie, Pôle de l'eau, 15 avenue du Charmois, 54500 Vandoeuvre, France
**CPB, UPR CNRS-UHP 6831, 17 rue Notre Dame des Pauvres, 54500 Vandoeuvre, France
***LEM, UMR ENSG-CNRS 7569, rue du Doyen M. Roubault, 54500 Vandoeuvre, France
****SERES, Faculté de Médecine, avenue de la Forêt de Haye, 54500 Vandoeuvre, France
*****LSE-LCPE UMR Université-CNRS 7564, Faculté de Pharmacie, Pôle de l'eau, 15 avenue du Charmois, 54500 Vandoeuvre, France
******AESN, 51 rue Salvadore Allende, 92027 Nanterre, France
*******ONEP, Laboratoire du Bou-Regreg, BP Rabat-Chelah, Rabat, Morocco
********SEDIF, 185 rue de Bercy, 75579 Paris-Cédex 12, France
*********CGE, 32 place ronde, 92982 Paris-La Défense, France
**********NANCIE, 149 rue Gabriel Péri, BP 290, F-54515 Vandoeuvre, France


ABSTRACT
Suspended particles transported by drinking water were examined to understand their role in deposit accumulation and colonization in pilot and full-scale reservoirs. No pesticides were detected in the deposits but several PAH were identified. Deposits accumulated at a rate of 8 g/cm2/day (29 g/m2/year) over a five month period. Quartz, feldspar, and amorphous iron were characterized in reservoir sediments. Sedimentation of suspended particles, mainly those composed of organic (biological) matter, was incomplete, and was not a key factor governing bacterial accumulation in the deposits (104 to 105 CFU/ cm2). Thus, limiting bacterial nutrients - dissolved organic matter - in treated water should be the only way to control the extent of bacterial colonization of deposits.

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