25 research outputs found
Genotypic identification of Cryptosporidium spp. isolated from hiv-infected patients and immunocompetent children of São Paulo, Brazil
Quantificação de citocinas no soro e homogenato da pata na intoxicação experimental com veneno de Bothropoides jararaca em ratos Wistar tratados com soroterapia e Mikania glomerata
Enraizamento in vitro de mudas micropropagadas de bananeira (Musa sp.) em diferentes meios de cultivo
Polyporales and similar poroid genera (Basidiomycota) from Parque Estadual da Serra do Mar, São Paulo State, Brazil
Xiquexique (Pilosocereus gounellei (A. Weber ex K. Schum.) Bly. ex Rowl.) em substituição à silagem de sorgo (Sorghum bicolor L. Moench) na alimentação de vacas leiteiras
Agaricomycetes (Basidiomycota, Fungi) diversity in a protected area in the Maracaju Mountains, in the Brazilian central region
Evaluation Of Activated Sludge Treatment And The Efficiency Of The Disinfection Of Giardia Species Cysts And Cryptosporidium Oocysts By Uv At A Sludge Treatment Plant In Campinas, South-east Brazil
Among many waterborne disease the giardiasis and cryptosporidiosis are of particular public health interest, because Giardia cysts and Cryptosporidium oocysts can persist for long periods in the environment, and both pathogenic protozoa have been implicated as the cause of many outbreaks of gastroenteritis in the last 25 years. In order to evaluate the efficiency of cysts and oocysts' removal by the activated sludge process, and by UV reactor in inactivating cysts and oocysts in one wastewater treatment plant (WWTP) of Campinas, three sampling points were selected for study: (1) influent. (2) treated effluent without UV disinfection and (3) treated effluent with UV disinfection, Giardia spp. cysts prevailed with higher density in the three different sample types. Cryptosporidium spp. oocysts were observed in only two samples of influent and just one sample of treated sewage with UV disinfection. In the animal infectivity assay for Giardia spp, on mouse of the UV treated group revealed trophozoites in intestinal scrapings. The results of the present study indicate that treatment by activated sludge process delivered a reduction of 98.9% of cysts and 99.7% of oocysts and UV disinfection was not completely efficient regarding the inactivation of Giardia cysts in the case of the WWTP studied. © IWA Publishing 2006.5438994Amoah, K., Craik, S., Smith, D.W., Belosevic, M., Inactivation of Cryptosporidium oocysts and Giardia cysts by ultraviolet light in the presence of natural particulate matter (2005) J. Wat., pp. 165-178Belosevic, M., Craik, S.A., Stafford, J.L., Neumann, N.F., Kruithof, J., Smith, D.W., Studies on the resistance/reactivation of Giardia muris cysts and Cryptosporidium parvum oocysts exposed to medium-pressure ultraviolet radiation (2001) FEMS Microbiol. Lett., 204, pp. 197-203Betancourt, W.Q., Rose, J.B., Drinking water treatment processes for removal of Cryptosporidium and Giardia (2004) Vet. Parasitol., 126 (1-2), pp. 219-234Briancesco, R., Bonadonna, L., An Italian study on Cryptosporidium and Giardia in wastewater, fresh water and treated water (2005) Env. Monit. Assess., 104, pp. 445-457Craun, G.F., Via, S.H., Waterborne outbreaks of cryptosporidiosis (1998) J. AWWA, 90, p. 91Darby, J.L., Snider, K.E., Tchobanoglous, G., Ultraviolet disinfection for wastewater reclamation and reuse subject to restrictive standards (1993) Wat. Env. Res., 65 (2), pp. 169-180Franco, R.M.B., Rocha-Eberhardt, R., Cantusio Neto, R., Occurrence of Cryptosporidium oocysts and Giardia cysts in raw water from the Atibaia river, Campinas, Brazil (2001) Rev. Inst. Med. Trop. S. Paulo, 43 (2), pp. 109-111(2002), www.funasa.gov.br, FUNASA - Fundação Nacional da Saúde. AvailableGarcia, A., Yanko, W., Batzer, G., Widmer, G., Giardia cysts in tertiary-treated wastewater effluents: Are they infective? (2002) Wat. Env. Res., 74, pp. 541-544Hachich, E.M., Sato, M.I.Z., Galvani, A.T., Menegon, J.R.N., Mucci, J.L.M., Giardia and Cryptosporidium in source waters of São Paulo State, Brazil (2004) Wat. Sci. Tech., 50 (1), pp. 239-245(2000), www.ibge.gov.br, IBGE - Instituto Brasileiro de Geografia e Estatística AvailableJolis, D., Lam, C., Pitt, P., Particle effects on ultraviolet disinfection of coliform bacteria in recycled water (2001) Wat. Env. Res., 73 (2), pp. 233-236Lindquist, H.D.A., Dufour, A.P., Wymer, L.J., Schaefer, F.W., II Criteria for evaluation of proposed protozoan detection methods (1999) J. Microbiol. Methods, 37, pp. 33-43Maturama, V.M.I., Ares-Mazás, M.E., Duran-Oreiro, D., Lonrenzo-Lorenzo, M.J., Efficacy of activated sludge in removing Cryptosporidium parvum oocysts from sewage (1992) Appl. Environ. Microbiol., 58 (11), pp. 3514-3516Medema, G.J., Schets, F.M., Teunis, P.F.M., Havelaar, A.H., Sedimentation of free and attached Cryptosporidium oocysts and Giardia cysts in water (1998) Appl. Environ. Microbiol., 64 (11), pp. 4460-4466Payment, P., Palnet, R., Cejaka, P., Removal of indicator bacteria, human enteric viruses, Giardia cysts, Cryptosporidium oocysts at a large wastewater primary treatment facility (2001) Can. J. Microbiol., 47, pp. 188-193Robertson, L.J., Paton, C.A., Campbell, A.T., Smith, P.G., Jackson, M.H., Gilmour, R.A., Black, S.E., Smith, H.V., Giardia cysts and Cryptosporidium oocysts at sewage treatment works in Scotland, UK (2000) Wat. Res., 34 (8), pp. 2310-2322Rochelle, P.A., Steve, J.U., Montelone, A., Woods, K., The response of Cryptosporidium parvum to UV light (2005) Trends Parasitol., 21 (2), pp. 81-87Rose, J.B., Huffman, D.E., Gennaccaro, A., Risk and control of waterborne cryptosporidiosis (2002) FEMS Microbiol. Rev., 26, pp. 113-123Santos, L.U., Bonatti, T., Cantusio-Neto, R., Franco, R.M.B., Detection of Giardia spp. cysts and Cryptosporidium oocysts in activated sludge by ether clarification technique and sucrose flotation (2004) Rev. Inst. Med. Trop. S. Paulo, 46 (6), pp. 309-313Savoye, P., Janex, M.L., Lazarova, V., Wastewater disinfection by low-pressure UV and ozone: A design approach based on water quality (2001) Wat. Sci. Tech., 43 (10), pp. 163-171Thompson, R.C.A., The zoonotic significance and molecular epidemiology of Giardia and giardiasis (2004) Vet. Parasitol., 126, pp. 15-3