Behavior of Metals,Pathogen Parasites,and Indicator Bacteria in Sewage Effluents During Biological Treatment by Activated Sludge |
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| Authors: | K. A. A. Tonani F. C. Julião T. M. B. Trevilato A. M. M. Takayanagui Ana Bocio Jose L. Domingo Susana I. Segura-Muñoz |
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| Affiliation: | 1.Laboratory of Ecotoxicology and Environmental Parasitology, Maternal Infant Nursing and Public Health Department,Ribeir?o Preto College of Nursing, University of Sao Paulo,Ribeir?o Preto,Brazil;2.Laboratory of Pediatrics, Metals Division,University Hospital of School of Medicine, University of S?o Paulo at Ribeir?o Preto,Ribeir?o Preto,Brazil;3.Environmental Health Laboratory, Maternal Infant Nursing and Public Health Department,Ribeir?o Preto College of Nursing, University of Sao Paulo,Ribeir?o Preto,Brazil;4.Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV,Universitat ‘Rovira i Virgili’,Reus,Spain |
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| Abstract: | The purpose of this study was to evaluate the behavior of metals, pathogen parasites, and indicator bacteria in sewage effluents during biological treatment by activated sludge in a wastewater treatment plant in Ribeirão Preto (WTP-RP), Sao Paulo, Brazil. The evaluation was done during a period of 1 year. Results showed that metal concentrations in treated effluents decreased, reaching concentrations according to those established by national regulations. The activated sludge process at the WTP-RP promoted a partial removal of parasites considered as possible indicators according to the WHO guidelines. Reduction factors varied between 18.2% and 100% for agents such as Endolimax nana, Entamoeba coli, Entamoeba hystolitica, Giardia sp., Ancylostoma sp., Ascaris sp., Fasciola hepatica, and Strongyloides stercoralis. A removal was also observed in total and fecal coliforms quantification. The present study represents an initial evaluation of the chemical and microbiological removal capacity of the WTP-RP. The results should be of interest for the authorities responsible for the environmental health at municipal, regional, national, and international levels. |
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