抄録
A survey of nematodes in drinking water treated by an advanced water treatment plant with biological treatment and granular activated carbon filter bed has been conducted for one year. Some nematodes with average 5.3%survival were observed in all samples from drinking water and the densities of nematodes seasonally fluctuated. Three genera 4 species were detected, but only two genera often appeared in which Plectus was abundant and Rhabditis was lesser. There was no relationship between rainfall and the densities of nematodes in drinking water. It was found that water temperature has a strong influence on the densities of nematodes. The species of nematodes in drinking water were much less than those in the water resource, which indicated that nematodes from the water resource were able to be removed by the water treatment facilities. On the other hand, the densities of nematodes in drinking water were much more than those in the water resource especially in the warmer seasons. It was suggested that some species like Plectus were able to breed within some treatment facilities, probably within the GAC filter.
