Direct filtration tests were carried out on a pilot plant (20 m3/h) in order to examine the relationships between the removal efficiency of the total particle count, the spores of aerobic spore-forming bacteria and turbidity. Samples were taken from the raw water of the St Lawrence River (Canada), the turbidity of which is between 1 and 5 NTU, and the treatment objective was to maintain the turbidity of the filtered water at a value less than or equal to 0.10 NTU at all times. The treatment comprises a coagulation step using polyaluminium chloride (PACl) or Percol LT35, followed by filtration (10 m/h) on a bilayer filter of sand and activated carbon. The results show that linear correlations exist between the removal of total particle count, aerobic spores and turbidity. There is a progressive increase in the total particle count in filtered water, which begins just after the ripening period of the filter and continues to the end of the filtration cycle. Increase in the aerobic spores is not evident until much later, and there is only a weak increase in the turbidity.
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March 2000
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Journal of Water Supply: Research and Technology-Aqua
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Research Article|
March 01 2000
Relationships between total particle count, aerobic spore-forming bacteria and turbidity in direct filtration
Souleymane Ndiongue;
Souleymane Ndiongue
1École Polytechnique de Montréal, Département des Génies Civil, Géologique et des Mines, Chaire Industrielle CRSNG en Eau Potable, C.P. 6079—succursale Centre-Ville, Montréal, Québec, Canada, H3C 3A7
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Raymond Desjardins;
2École Polytechnique de Montréal, Département des Génies Civil, Géologique et des Mines, Chaire Industrielle CRSNG en Eau Potable, C.P. 6079—succursale Centre-Ville, Montréal, Québec, Canada, H3C 3A7
Tel: +1 (514) 340-4711-4505; Fax: +1 (514) 340-5918; E-mail: [email protected]
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Michèle Prévost
Michèle Prévost
1École Polytechnique de Montréal, Département des Génies Civil, Géologique et des Mines, Chaire Industrielle CRSNG en Eau Potable, C.P. 6079—succursale Centre-Ville, Montréal, Québec, Canada, H3C 3A7
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Journal of Water Supply: Research and Technology-Aqua (2000) 49 (2): 75–88.
Citation
Souleymane Ndiongue, Raymond Desjardins, Michèle Prévost; Relationships between total particle count, aerobic spore-forming bacteria and turbidity in direct filtration. Journal of Water Supply: Research and Technology-Aqua 1 March 2000; 49 (2): 75–88. doi: https://doi.org/10.2166/aqua.2000.0007
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