Modelagem geológica e análise hidroquímica sobre ocorrências de nitrato nas águas subterrâneas no aquífero Rio Claro (SP)

• Autor(a) principal: Costa, Pedro Paulo Bazílio da [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203387; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-05-14/000914949.pdf
• topic: Modelagem geologica; Química da água; Nitratos; Águas subterrâneas; Aquiferos; Águas subterrâneas - Poluição; Rio Claro (SP)

Groundwater contamination by nitrate is a very common scenario in urban areas due to the leakage of sewage networks or the infiltration of waste from septic tanks. One of the consequences of this contamination by nitrate is that it brings damage to the population is the disease known as methemoglobinemia. This problem is potentiated when the aquifer is shallow and free, with high permeability values. The main way to solve the problem of potable nitrate contaminated groundwater is to identify the source of contamination and make a program to contain it. Based on this premise, the present work aims to discuss the source of the nitrate contaminant that pollutes the groundwater in the Rio Claro aquifer, within the Unesp Campus of Rio Claro / SP. To obtain this result, we performed: hydrochemical data compilations belonging to the Basin Study Laboratory (LEBAC); measurements of changes in the level of the aquifer; new hydrochemical data obtained through sampling and geological modeling. The Rio Claro Aquifer, located in the homonymous municipality, is a shallow and free aquifer, composed of a thick and predominantly sandy bundle of the Rio Claro Formation. It has naturally good water quality and much of this reservoir extends under the urban area of the municipality. The results obtained from the monitoring of some wells show that nitrate concentrations remain stable, while in other wells there are downward trends. This result indicates that septic tanks are not the only sources of nitrate contamination and there are other active sources contributing to the high concentrations of nitrate observed, such as sewage leaks in the external and internal area of the campus