Abstract
Photoreactivation of fecal coliforms and subsequent regrowth was investigated in effluents of wastewater treatment plants using ultraviolet light as the disinfectant. Shielding of bacteria ingested in Daphnia sp in the plant outfalls was shown to be a major contributor to increased fecal coliform, E. coli, fecal streptococci and enterococci after fragmentation of the Daphnia sp due to normal dieoff. Representative fecal coliform colonies that comprised the regrowth population were identified to species with E. coli, a small fraction of the total fecal coliform population.
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