Dissolved inorganic nutrients and chlorophyll a in an estuary receiving sewage treatment plant effluents: Cachoeira River estuary (NE Brazil)
| Autor: | Marcelo Friederichs Landim de Souza, Maria Aparecida Macedo Silva, Alonso Góes Guimarães, Michelle Coêlho Lima, Gilmara F. Eça, Danielle Felix Santos |
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| Rok vydání: | 2012 |
| Předmět: |
Chlorophyll
Nitrogen Management Monitoring Policy and Law Waste Disposal Fluid chemistry.chemical_compound Rivers Nitrate Dry season Water Pollution Chemical Water pollution Effluent General Environmental Science Hydrology geography geography.geographical_feature_category Sewage Chlorophyll A Phosphorus Estuary General Medicine Eutrophication Pollution chemistry Environmental science Sewage treatment Estuaries Brazil Water Pollutants Chemical Environmental Monitoring Waste disposal |
| Zdroj: | Environmental Monitoring and Assessment. 185:5387-5399 |
| ISSN: | 1573-2959 0167-6369 |
| DOI: | 10.1007/s10661-012-2953-x |
| Popis: | Sampling was conducted monthly during a transition period between the dry and rainy seasons in order to evaluate the effectiveness of a municipal sewage treatment plant (STP) in eutrophication control. STP effluent and fluvial input data were also estimated. In the dry period, high concentrations of nutrients, chlorophyll a (up to 360 μg L(-1)), and anoxia in bottom waters were observed in the upper portion of the estuary. Nitrate was scarce during the dry months, although high concentrations were observed at the river sources and the upper estuary. The N:P and Si:P molar ratios were usually below 16:1, and the Si:N ratio was higher than 1:1. The fluvial inputs were a greater source of nutrients to the estuary than the STP, but nutrient loading by these effluents were also important in contributing to the eutrophication of the upper estuarine zone, especially in the dry season when symptoms were more intense. |
| Databáze: | OpenAIRE |
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