Métodos geoelétricos empregados na caracterização e monitoramento de anomalias inerentes à infiltração controlada de vinhaça

• Ano de defesa: 2014
• Autor(a) principal: Bortolin, José Ricardo Melges [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Geophysics; Geofisica; Vinhaça; Resistencia eletrica; Indução eletromagnetica; Residuos organicos como fertilizantes; Condutividade eletrica; Solos - Poluição
• Link de acesso: http://hdl.handle.net/11449/114080

The vinasse is a liquid waste that results of the ethanol production process, in approximate ratio of 13 liters of vinasse for each ethanol liter. This waste is used as fertilizer in sugar cane plantations because it's mainly rich in potassium, sodium, magnesium, and calcium, but, the excess of vinasse can cause soil and groundwater's contamination. In this thesis, three different volumes of vinasse (60, 300, and 900 liters) were infiltrated into two ditches (A and B) escavated in two geologically distinct areas, and the resultant contamination plume was investigated by mean of four geophysical methods: spontaneous potential (SP), electrical resistivity (ER), induced polarization (IP) and electromagnetic (EM). The first area is located on the Corumbataí Formation, that’s mainly characterized by silty and clayey sediments. The second area is located over sand sediments of the Pirambóia Formation. At the Area 1, anomalies were observed only after the infiltration of 900 liters of vinasse in the ditch B. In the ER method, an electrical resistivity profile showed a low resistivity anomaly in the location where the vinasse was infiltrated. In the IP method, a chargeability profile showed a low chargeability anomaly in the same location. The results of EM and SP methods do not revealed any anomaly that could be correlated with vinasse infiltration. At the Area 2, anomalies were observed after the infiltration of 60 liters of vinasse in the ditch A (EM method) and 300 and 900 liters of vinasse in the ditch B (ER and EM methods). In the ER method, the anomalies were characterized by low resistivity values, contrasting with the high resistivity background values. In the EM method, the anomalies were identified by mean of high values of electrical conductivity. In this case, the results of IP and SP methods do not revealed any anomaly, and could not be correlated with vinasse infiltration. The results obtained at the Area 1 were associated to...