Distribution of Bacterial Plasmids in an Activated Sludge Plant.

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  • Distribution of Bacterial Plasmids in a

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Distribution of bacterial plasmids in a wastewater treatment plant using activated sludge process wasinvestigated. Each 10 strains of dominant bacteria, enteric bacteria, ampicillin (Ap) -, kanamycin (Km) -, tetracycline (Tc) -, and streptomycin (Sm) -resistant bacteria and bacteria which show resistant triply toAp, Km and Tc were isolated from the influent, activated sludge and effluent from Minami-Suitaactivated sludge treatment plant (Suita, Osaka, Japan) and their plasmid contents were examined. In all, 150plasmids were detected in 52 (25%) of 210 strains, 37 strains of which harbored multiple (2to9) plasmids. Although 40ut of 10 dominant bacteria isolated from the influent possessed plasmids, theywere observed in only one out of 10strains isolated from the activated sludge, suggesting that the plasmidpossession may give no or little advantage to their host in the aeration tank. On the other hand, ratio ofplasmid-harboring bacteria in the effluent was higher (4out of 10 strains) than that in the activatedsludge. Such tendency was observed for not only dominant bacterial population but also for otherantibiotic-resistant bacterial populations. Dominant bacteria mainly harbored small plasmids (smallerthan 5 kilobase (kb) ) . Plasmids larger than 30 kb, that can code gene transfer function, were alsodetected at frequency of 30%.

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