Acute and chronic toxicity evaluation at Jundiaí river, influent and effluent from Novo Horizonte Wastewater Treatment Plant (NHWWP), Jundiaí, São Paulo / Avaliação de toxicidade aguda e crônica em águas do Rio Jundiaí e em afluentes e efluentes da ETE Novo Horizonte,Jundiaí, São Paulo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Jundiaí is located approximately 60 kilometers from São Paulo and has a population of 342,983 habitants which 94.37% lives in urban areas. Jundiaí is included in the Jundiaí River basin witch is formed from the confluence of River Jundiaizinho with Ribeirão das Taipas, it has a length of 123 kilometers and its mouth is located in Salto, at the confluence of Jundiaí River with Tietê River. This is the smaller basin of the state and also one of the most industrialized. Jundiaí has the Novo Horizonte Wastewater Treatment Plant (NHWWP) which collects 98% of the city sewage, and treats 100% of it, with the removal of organic load efficiency 92%, which waste is drainage in Jundiaí River. The present work used toxicity tests with aquatic organisms to assess the toxic effect that comes form the station, the efficiency of biological treatment, and the influence of the station on its surroundings. Samples were collected at 6 different points, the upstream of NHWWP (P1), the entry of NHWWP (P2), in the pipeline for distribution to the aeration lagoons (P3), in the 2 outputs (P4 and P5) and downstream of NHWWP (P6). The samples of the influents were more toxic than the effluent of NHWWP and the results from the river samples did not show difference. The effective toxic concentrations EC 50 ranged between 2.23% and 9.39% for Vibrio fischeri on the pipeline entry to and lagoons, and varied between 15.52% and 89.95% for Daphnia similis, for the NHWWP enter the values ranged between 4.63% and 8.31% for Vibrio fischeri, and 17.68% and not toxic to Daphnia similis. In campaigns where sampled the outputs of NHWWP and river waters, the tests with Vibrio fischeri performed between 53.55% and not toxic to the river water and 29.46% and not toxic to the effluent of NHWWP, for while to Daphnia similis, the results were between 55.92% and not toxic to the river water and 70.97% and not toxic to the effluent of ETE. In tests conducted with Ceriodaphnia dubia, the average of births for the river water was between 4.60 and 15.00 while for the effluent of NHWWP was between 4.50 and 10.35 for crude sample. The results show the efficiency of NHWWP in the removal of toxicity but other parameters should be observed to demonstrate the impact of their effluents on the River waters.

ASSUNTO(S)

ecotoxicologia daphnia similis vibrio fischeri. ete novo horizonte daphnia similis ete novo horizone rio jundiaí ecotoxicologia vibrio fischeri. rio jundiaí

Documentos Relacionados