Navegando por Assunto "Underground water"

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Acesso aberto (Open Access)
Estudo hidrogeológico através de perfis geofísicos de poços e sondagens elétricas verticais (SEV's) – Salinópolis-Pa
(Universidade Federal do Pará, 2014-02-27) FREIMANN, Boris Chaves; ALVES, José Geraldo das Virgens; http://lattes.cnpq.br/8082136954133058; SILVA, Marcos Welby Correa; http://lattes.cnpq.br/3213216758254128
It was realized a correlation of geophysical well logs from the Sanitation Company of Pará (COSANPA) drilled in the city of Salinópolis for the local supply. The study was conducted in many areas of impound, covering 15 wells. The parameters used in the correlation were Self Potential (SP), Electrical Resistivity (ER) and Gamma Ray (GR). Also, for control purposes, was used the lithological log of the wells obtained from samples of drill cutting. This correlation was conducted to evaluate the lateral continuity of permeable and impermeable layers, in order to develop sections of the subsurface with high accuracy. I was also used Vertical Eletrical Sounding (VES) for comparation efect. It was found the probable existence of two major aquifers that lie 60 meters below sea level and have lateral continuity along the full extent of the studied area. It was also found that the top of the basement in the studied area is around 120 meters below sea level. These findings are extremely important for a better location and constructive evaluation for supply wells in the future projects in the city of Salinópolis-Pa.
Acesso aberto (Open Access)
Influência do leito de contato na eficiência de remoção de ferro de águas subterrâneas
(Universidade Federal do Pará, 2006-12-27) LIMA, Rosete Ferreira de; MACHADO, Luiza Carla Girard Teixeira; http://lattes.cnpq.br/9773700229115395
The present work consisted on the evaluation of the acting of a Pilot Iron Removal Plant (IRP), regarding the presence or absence of contacting surface. The Pilot IRP is composed by an multiple tray aerator, a contact surface by ascending flow and a downflow rapid sand filter, sited at Federal University of Pará, using raw water from underground water deposits, containing high quantity of Iron, around 2mg/L, above the 0.3mg/L established on the 518/2004 law. During the monitoring two experimental phases were made, the first with the contact surface and the second without it, being adopted three filtration rates: 180m/mxday, 270m/mxday and 360m/mxday. In the experimental phases were appraised the following variables: pH, Color, Total Iron, Ferrous Iron and the turbidity. The efficiency of removal of total iron obtained for the rates of filtration of 180m/mxday, 270m/mxday and 360m/mxday with the contact surface was 93% to 94%, 85 % to 95% and 91% to 92%, respectively. Without the contact surface the efficiency of extracting of iron was around 91% to 93%, 91% to 93% and 88% to 93%, respectively. The filtration duration with contact surface for the rates of 180m/mxday, 270m/ mxday and 360m/mxday presented duration of 41h, 30h and 22,7h, respectively, while with the absence of contact surface the medium duration was of 16h, 12h and 4,7h respectively. In that way it can be concluded that the contact surface is an indispensable unit in a IRP, because it improves the system acting, producing effluent of good quality effluent and langers filtrat ons.