I. Miettinen et al., MICROBIAL-GROWTH AND ASSIMILABLE ORGANIC-CARBON IN FINNISH DRINKING WATERS, Water science and technology, 35(11-12), 1997, pp. 301-306
Citations number
12
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
The amount of assimilable organic carbon (AOC) and bacterial regrowth
was studied in drinking waters from seven Finnish surface and groundwa
ter works. Bacterial regrowth in drinking waters was studied by in vit
ro laboratory incubation tests and by enumerating the microbes in dist
ribution networks. Bacterial numbers were counted as heterotrophic via
ble counts and as total direct counts (AODC). The bacterial production
activity was studied as H-3-thymidine uptake. AOC, measured with a bi
oassay was 390+/-130mg/l and 170+/-60mg/l in drinking waters produced
from surface waters and from groundwaters respectively. The content of
AOC was slightly reduced in distribution pipelines of groundwater wor
ks whereas in the distribution pipelines of surface water works it was
reduced by 40%. Bacterial regrowth occurred in all drinking waters. S
urprisingly, the heterotrophic regrowth was greater in drinking waters
produced from groundwaters than in those produced from surface waters
. AOC levels correlated poorly with the in vitro bacterial growth test
s and with occurrence of bacteria in distribution networks. (C) 1997 I
AWQ. Published by Elsevier Science Ltd.