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http://hdl.handle.net/1843/52194| Type: | Artigo de Periódico |
| Title: | Nitrate Contamination in Brazilian Urban Aquifers: a Tenacious Problem |
| Authors: | Ricardo Hirata Reginaldo Bertolo Fabiana Cagnon Aline Bernice Carlos Maldaner Paulo Henrique Ferreira Galvão Carlos Henrique Gil Marques Rafael Terada Cláudia Varnier Cathryn Ryan |
| Abstract: | ThisstudyfollowsthegeochemistryofnitrogeninaCretaceousandunconfinedsedimentary aquiferinthecityofUrânia(Brazil)over20years. Althoughthesewernetworkwasbuiltinthe1970s, thenitratecontaminationproblem(>45mg/L-NO3−)persiststothisday. Theoldesturbanizationareas locatedinthenorthofthecityinitiallyusedcesspitsforwastewaterandcurrentlypresentthehighest nitrateconcentrations(>120mg/L-NO3−),withtheplumereachingthedeeperaquiferportions(upto 100m). Thecontaminationisnotasdramaticinthesouthpartofthecity,whereurbanizationincluding installationofthesewagenetworkwithPVCpipesthataremoreresistanttoleakthantheoldceramic networks occurred after 1985. Based on the constructive well profiles, three hydrogeochemical zones were established: shallow (<20 m deep), with average nitrate of 63 mg/L-NO3−; intermediate (20–60 m), with 30 mg/L-NO3−; and deep (>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. |
| Subject: | Recursos hídricos Caracterização hidrogeológica |
| language: | por |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | IGC - DEPARTAMENTO DE GEOLOGIA |
| Rights: | Acesso Aberto |
| metadata.dc.identifier.doi: | 10.3390/w1210270 |
| URI: | http://hdl.handle.net/1843/52194 |
| Issue Date: | 2020 |
| metadata.dc.url.externa: | http://https://www.mdpi.com/2073-4441/12/10/2709/htmdoi:10.3390/w1210270 |
| metadata.dc.relation.ispartof: | Water |
| Appears in Collections: | Artigo de Periódico |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Nitrate Contamination in Brazilian Urban Aquifers A Tenacious Problem.pdf | 38.61 MB | Adobe PDF | View/Open |
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