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A pilot study of biological GAC filtration in drinking-water treatment

par Servais, Pierre ;Billen, Gilles ;Bouillot, P.;Benezet, M.
Référence Journal of water supply: research and technology. AQUA, 41, 3, page (163-168)
Publication Publié, 1992

Article révisé par les pairs

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Résumé :

The impact of empty-bed contact time and temperature on the efficiency of biological GAC filtration has been studied on pilot filters at the Neuilly-sur-Marne treatment plant. Fixed bacterial biomass was investigated using a method of potential respiration of labelled glucose and the filtration efficiency was characterized by the removal of biodegradable dissolved organic carbon (BDOC). With a fixed bacterial carbon biomass of c. 2 mg/l, pilots with empty-bed contact times of 10 min removed around 60% of BDOC. The net exportation of bacterial biomass was very low when compared to the removal of BDOC achieved by the filtration. BDOC removal increased with increasing empty-bed contact times in the tested range of filtration velocities (6-18 m/h). Data showed that it was necessary to double the empty-bed contact time when temperature decreased from 20 degree C to 8 degree C to keep a similar BDOC removal efficiency, although the average bacterial biomass was the same at both temperatures.