Using stable isotopes to discriminate anthropogenic impacts of the sedimentary organic matter pollution in the Rodrigo d
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RESEARCH ARTICLE
Using stable isotopes to discriminate anthropogenic impacts of the sedimentary organic matter pollution in the Rodrigo de Freitas Lagoon (RJ, Brazil) Mariana Vezzone 1,2 & Roberto Meigikos dos Anjos 2 & Ricardo Gonçalves Cesar 3 & Marcelo Muniz 2 & Renan Cardoso 2 & João Paulo Felizardo 2 & Daniela Vasconcelos 4 & Helena Polivanov 1 Received: 10 July 2019 / Accepted: 13 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Over the last decades, the Rodrigo de Freitas Lagoon (RFL), Rio de Janeiro, Brazil, has been impacted by the release of untreated domestic sewage, causing eutrophication processes with negative effects on its biota. Recently, the RFL underwent urban interventions to fulfill the demands of the 2016 Olympic Games, which included building the waist gallery and monitoring clandestine waste discharges into the underground drainage network. Organic-source tracing methods can be successfully used to characterize the organic matter transported from the urbanized areas to the RLF. The application of the elemental (C, N) and stable isotope (δ15N and δ13C) fingerprint methods in sediments from the RLF indicated a reduction in the domestic sewage inputs from 32 ± 16 to 12 ± 13% between 2015 and 2017. However, the sewage inputs continue being worrying. Our results also suggest that the main source of organic matter pollution in the lagoon comes from indiscriminate domestic sewage release from river channels. Secondary pollution sources are associated with the underground drainage network that still shows punctual and irregular releases of domestic sewage. Petroleum products, mainly from sewers, also show as possible organic pollution sources. Finally, the findings indicate that the interventions carried out in the RFL are promising. However, they were insufficient to cease the pollutant inputs and mitigate the negative impacts of eutrophication. Keywords Untreated domestic sewage . Urban interventions . 2016 Olympic Games . Total stable isotopes of carbon and nitrogen
Highlights • Previous actions have not resulted in significant effects on organic matter pollution • Although the domestic sewage contribution has declined, it is still representative • The main sewage sources are the drainage basins in the Rodrigo de Freitas Lagoon area Responsible Editor: Vedula VSS Sarma * Mariana Vezzone [email protected] 1
2
Departamento de Geologia, CCMN – Instituto de Geociências, Federal University of Rio de Janeiro, UFRJ, Av. Athos da Silveira Ramos, 274 – Cidade Universitária, Rio de Janeiro, RJ, Brazil Instituto de Física, Federal Fluminense University, UFF, Av. Litorânea, s/n - Praia Vermelha, Niterói, RJ, Brazil
3
Departamento de Geografia, CCMN – Instituto de Geociências, Federal University of Rio de Janeiro, UFRJ, Av. Athos da Silveira Ramos, 274 – Cidade Universitária, Rio de Janeiro, RJ, Brazil
4
Departamento de Geoquímica, Instituto de Química, Federal Fluminense University, UFF, Outeiro São João Batista S/N., Niterói, RJ, Brazil
Environ Sci Pollut Res
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