Ecotoxicity Assessment of Suzano Wastewater Treatment Plant (São Paulo) Using Daphnia Similis and Vibrio Fischeri
Abstract
Population growth and industrial development generate pollution to water resources far above their assimilation capacity. The environmental control agency, (CETESB) ensures 27 sites for monitoring toxicity at Tietê River (Alto Tietê), and priority is given to water supply sources. Few data is available on toxicity monitoring of waste water treatment plant (WWTP) from São Paulo. The objective of this study was to evaluate the toxicity of affluent and effluent of Suzano WWTP, assessing the reduction in toxicity. Five samples were taken from September 2005 to March 2008. A complete removal of acute toxicity for D. similis was obtained but for Vibrio fischeri the efficiency of treatment was not the same. With this luminescent bacteria, the average efficacy of SWWTP was 57.90%. Comparison among studies evidenced less toxicity in the present as a result of some efforts done by the São Paulo Water and Sewage Company (SABESP).
Keywords: Daphnia similis, effluents, wastewater treatment plant, toxicity, Vibrio fischeri.
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