Eficiência de wetlands construídos com dez dias de deten o hidráulica na remo o de colífagos e bacteriófagos

The sewers, rich in organic matter, they are thrown, most of the time, without previous treatment in the environment, polluting aquatic bodies and putting in risk the health of the populations that you/they will use that water. Therefore, before the release in aquatic bodies, those effluents need to pass for a previous treatment that improves your quality and reduce like this the negative impact of your release in the environment. This work evaluates a system of " built wetlands " (constituted of 5 tanks of cement amianthus - being 1 control and the other ones 4 vegetated with Typha spp, with capacity of 227 liters, filled with it breaks 19mm up to 40cm of height and fed with water of a stream polluted by domestic sewers) with 10 days of hydraulic detention, in the removal of somatic colifagos and F-specific bacteriófagos. After seven months of analysis (jan-jul/01), the vegetated tanks showed a rate of medium removal of 88,4% (DBO5), 99,96% (fecal coliformes), 99,75% (somatic colifagos) and 99,86% (F-specific bacteriófagos). THE tank control presented smaller medium removals than the vegetated tanks. The temperature was the same in the vegetated tank and in the tank it controls, both with difference of 2% in relation to the temperature of the tributary. The pH increased 3,7% in the tank it controls and it was reduced in 1,8% in the vegetated tank. The electric conductivity already decreased in 12,7% in the tank it controls and it increased 90,1% in the vegetated tanks. The dissolved oxygen didn't have significant increase, in the tanks control and vegetated, respectively. The influence of the vegetation was evident, in the vegetated wetlands, for the smallest removals in the tank controls. That system was shown very efficient to remove colifagos and the F-specific bacteriófagos that can probably be used as indicators of virus patogênicos (especially these last ones).