Abstract
Lake Paranoá is a human-made water reservoir created in 1959 together with the new capital of Brazil (Brasilia). With the demands of urban development, population growth, and land use changes, the lake presented severe deterioration of water quality due to the disposal of wastewater with a high concentration of nutrients. To better elucidate the natural and anthropogenic sources controlling the water quality from Lake Paranoá, this study aimed to (1) investigate the main geochemical processes controlling water quality of the lake and its tributaries; (2) evaluate Lake Paranoá’s trophic state; and (3) determine the occurrence and fate of organic micropollutants in Lake Paranoá waters and WWTPs effluents. The waters from Lake Paranoá tributaries are naturally acidic due to the nature of the extremely weathered ferralsols and the crustal material composition. The main processes linked with anthropogenic activities that affect the water quality from the tributaries are the input of untreated domestic wastewater and the dissolution of carbonate minerals arising from construction material residues. Generally, the waters of Lake Paranoá presented low nutrient and chlorophyll-a concentrations, indicating a low trophic state (oligo-mesotrophic). A significant increase in the trophic state (super-eutrophic) was observed at specific regions of the lake that have high nutrient input from tributaries, caused by the continuous disposal of untreated domestic sewage. In Lake Paranoá waters, the organic micropollutants that were identified and quantified (caffeine, bezafibrate, bisphenol A, diethyl phthalate, and nonylphenol) presented concentrations consistent with previous studies and within the threshold of toxicity, except bisphenol A.
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The authors acknowledge CNPQ for the financial support and CAPES for providing a MSc. grant. Alexandre Moraes de Carvalho and CAESB are acknowledged for providing some of the data used herein. We also would like to thank José Eloi Campos for his helpful review on data discussion and to Instituto Evandro Chagas for analytical support. Timothy Mulholland is thanked for a final correction on the grammar of the manuscript.
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Mar da Costa, N.Y., Boaventura, G.R., Mulholland, D.S. et al. Biogeochemical mechanisms controlling trophic state and micropollutant concentrations in a tropical artificial lake. Environ Earth Sci 75, 854 (2016). https://doi.org/10.1007/s12665-016-5629-y
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DOI: https://doi.org/10.1007/s12665-016-5629-y