Seasonal and diurnal surveillance of treated and untreated wastewater for human enteric viruses.

There was little evidence of diurnal variability in concentrations of viruses, though there were some highly significant trends ( p < 0.001). pH and turbidity of wastewater In the effluent samples collected at Betws-y-Coed, higher pH values were observed during the summer sampling event (median pH 7.36) than during the autumn and the winter sampling campaigns (median pH 6.79 and 6.62, respectively; Fig. 2 ) with little variation evident during the sampling events (Fig. 3 d–f).

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