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http://www.repositorio.ufop.br/jspui/handle/123456789/13570
Título: | Nitrate contamination in Brazilian urban aquifers : a tenacious problem. |
Autor(es): | Hirata, Ricardo Cagnon, Fabiana Alves Bernice, Aline Michelle Maldaner, Carlos Henrique Galvão, Paulo Henrique Ferreira Marques, Carlos Henrique Gil Terada, Rafael Varnier, Claudia Luciana Ryan, M. Cathryn Bertolo, Reginaldo Antonio |
Palavras-chave: | Nitrate Groundwater contamination Urban hydrogeology Urban aquifer recharge |
Data do documento: | 2020 |
Referência: | HIRATA, R. et al. Nitrate contamination in brazilian urban aquifers: a tenacious problem. Water, v. 12, n. 10, p. 2709, ago./set. 2020. Disponível em: <https://www.mdpi.com/2073-4441/12/10/2709>. Acesso em: 24 mar. 2021. |
Resumo: | This study follows the geochemistry of nitrogen in a Cretaceous and unconfined sedimentary aquifer in the city of Urânia (Brazil) over 20 years. Although the sewer network was built in the 1970s, the nitrate contamination problem (>45 mg/L-NO3 −) persists to this day. The oldest urbanization areas located in the north of the city initially used cesspits for wastewater and currently present the highest nitrate concentrations (>120 mg/L-NO3 −), with the plume reaching the deeper aquifer portions (up to 100 m). The contamination is not as dramatic in the south part of the city, where urbanization including installation of the sewage network with PVC pipes that are more resistant to leak than the old ceramic networks occurred after 1985. Based on the constructive well profiles, three hydrogeochemical zones were established: shallow (60 m), with 17 mg/L-NO3 −. The current total nitrate mass in the aquifer exceeds 731 kg-NO3 −. Numerical flow (Modflow) and transport (MT3D) model scenarios support the hypothesis that the nitrate contamination is caused by substantial infiltration of nitrogen through the cesspits until the 1970s, but after the 1990s, leaks from the sewer network should be responsible for the maintenance of the recently observed high concentrations of nitrate. |
URI: | http://www.repositorio.ufop.br/jspui/handle/123456789/13570 |
DOI: | https://doi.org/10.3390/w12102709 |
ISSN: | 2073-4441 |
Licença: | This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Fonte: o PDF do artigo. |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_NitrateContaminationBrazilian.pdf | 28,83 MB | Adobe PDF | Visualizar/Abrir |
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