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2099-12-31
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DISINFECTION OF DOMESTIC EFFLUENTS BY GAMMA RADIATION: EFFECTS ON THE INACTIVATION OF ASCARIS LUMBRICOIDES EGGS
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Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Sanitary and Environmental Engineering. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
René Rachou Research Center. Oswaldo Cruz Foundation. Belo Horionte, MG Brazil
Center for Development of Nuclear Technology. Belo Horizonte, MG, Brazil
Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Sanitary and Environmental Engineering. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
Department of Parasitology. Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brazil
René Rachou Research Center. Oswaldo Cruz Foundation. Belo Horionte, MG Brazil
Center for Development of Nuclear Technology. Belo Horizonte, MG, Brazil
Abstract
This work investigated the inactivation of Ascaris lumbricoides eggs in domestic effluents by gamma radiation from a (60)Co source. Domestic wastewater was treated in a compact demo-scale system consisting of a UASB reactor and a trickling filter; treatment was carried out at the Center for Research and Training on Sanitation (CePTS), Federal University of Minas Gerais, in Belo Horizonte-MG, Brazil. One-liter of treated wastewater samples was artificially contaminated with an average of 1000 non-embryonated Ascaris lumbricoides eggs from human feces; samples were then irradiated in a multiple-purpose irradiator at different doses (0.5-5 kGy). Eggs were recovered from the wastewater and the viability of these irradiated eggs was evaluated; the description of the egg developmental phases with each dose of gamma radiation was recorded. Radiation doses of 3.5 kGy effectively disinfected effluents with lower concentrations of A. lumbricoides eggs; higher radiation doses of 5 kGy were necessary to disinfect effluents with higher eggs concentrations.
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