Hidrológiai Közlöny 2000 (80. évfolyam)

2. szám - Dombay Gábor: Az ivóvíz bakteriális minőségének változása a vízelosztó hálózatban

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(7), 24622466. A kézirat beérkezett: 1999. augusztus 9. PhD, oki. mérnök, Fővárosi Vízművek Rt., Vízminőségi és Környezetvédelmi Osztály. Bacterial drinking water quality changes in the distribution system Dombay, G. Abstract: Bacterial water quality deterioration in the drinking water distribution system is due to biofilm activity. The number of suspended bactena in the bulk is increased by biofilm detachment. Biofilm kinetics is influenced by hydraulic and water quality parameters. The distribution system is a complex biofilm reactor of which behavior can be studied by the use of biofilm models. Free active bacteria concentrations change in residence time only in the initial transitory period, the asymptote is determined by BDOC concentration and temperature. The notion of biological stability is not applicable in all kinds of circumstances, and should be complemented by temperature constraint. Bacterial drinking water quality deterioration can be controlled by decreasing BDOC concentration or maintaining a closely constant chlorine concentration in the distribution system. Keywords: drinking water, distribution system, biofilm, bacteria, BDOC, biological stability. GÁBOR DOMBAY PhD CE, Waterworks of Budapest Co. Ltd., Water Quality and Environment Department.