Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil

Abstract

The present study aimed to evaluate the water quality of the Icaraí Sewage Outfall (ISEO) area. Sampling was conducted during winter and summer, and water samples were analyzed for dissolved oxygen, pH, temperature, salinity, dissolved inorganic nutrients (DIN), seston, particulate organic matter (POM), and pigments. Results showed that the water chemistry of the area suffers temporal and spatial variation. Great variability was also seen in the C:N:P ratios of POM (August, 112:30:1; December, 59:11:1) and in the DIN concentrations. Chlorophyll-a and ammonium concentrations (4.5 µg L-1 - 71.2 µg L-1, and 0.20 µM - 52,6 µM, respectively) characterized the ISEO area as eutrophic. The dispersal of the material was not effective under certain oceanographic conditions.<br>O presente estudo teve por objetivo avaliar a qualidade da água na área do Emissário de Esgoto de Icaraí (ISEO). A amostragem foi realizada durante o inverno e o verão, e as amostras de água foram analisada quanto ao oxigênio dissolvido, pH, temperatura, salinidade, nutrientes inorgânicos dissolvidos (NID), seston, matéria orgânica particulada (MOP) e pigmentos. Os resultados mostraram que a química da água apresenta variações temporal e espacial. Grande variabilidade foi também observada nas razões C:N:P do MOP (Agosto, 112:30:1; Dezembro, 59:11:1) e nas concentrações de NID. As concentrações de clorofila-a e amônia (4.5 µg L-1 - 71.2 µg L-1, e 0.20 µM - 52,6 µM, respectivamente) caracterizam a área do ISEO como eutrófica. A dispersão do material não é efetiva em certas condições oceanográficas

Stable isotope variation in macroinvertebrates indicates anthropogenic disturbance along an urban stretch of the river Tiber (Rome, Italy)

“…SIA in WWTP-impacted communities WWTP-upstream to downstream increases in nutrient loads were proved by increasing ammonium and POM concentrations. As ammonium is considered a useful tracer of WWTP discharge (Thomas and Carsola, 1980) and an indicator of the effluent (Marques Júnior et al, 2006), the spatial distribution of its concentration can indicate its point source of pollution. WWTP outfall loads have a significant effect on nitrogen signatures.…”

Abundance and diversity patterns of the sessile macrobenthic community associated with environmental gradients in Vitória Harbor, southeastern Brazil

“…Low concentrations of dissolved oxygen, and great amounts of organic nutrients are characteristic of estuarine waters contaminated with domestic sewage (MAYER-PINTO & JUNQUEIRA 2003, MARQUES JUNIOR et al 2006, VIZZINI & MAZZOLA 2006. This contamination contributes to environmental stress.…”

Remote Sensing Analysis of the Impact of COVID lockdowns on Water Quality in Four Water Bodies in Latin America

“…Significant land-use change away from the natural estuarial ecosystems to heavy industrial and residential has led to widespread ecological degradation in water quality in the bay [3,4]. Unfiltered organic waste from sewage outfalls draining dense residential development has led to severe eutrophication and a significant decline in marine life [5,6]. High Chlorophyll-a levels tend to be observed at locations draining dense residential and industrial development, which correspond to Virtual Gage locations 1, 2, and 3 (Figure 8).…”