André Celligoi

Geophysical technique and groundwater monitoring to detect leachate contamination in the surrounding area of a landfill – Londrina (PR – Brazil)

The aim of the present study was to define leachate plume by using two techniques: geophysical and groundwater sampling in order to evaluate groundwater contamination. After performing a topographic survey and using geophysics, the leachate plume was identified. With this data, the wells for groundwater monitoring were located. Groundwater samples were analyzed for: COD, BOD, pH, alkalinity, conductivity, TKN and heavy metals. Through the electroresistivity method it was possible to define the shape of plume contamination. This method was important to locate the groundwater monitoring wells. The results of the physicochemical parameters showed the suitability of the geophysical study. The highest values of electric conductivity and alkalinity correspond to the wells located in the area interpreted as contaminated by leachate in the map of the resistivity. Even with seasonal variations, BOD values are low if compared to Brazilian environmental regulations, but COD values are higher up to 40 times the values of BOD. The concentrations of Ni, Zn, Cd and Cu in the groundwater are below the limits established by the potable water quality standards in Brazil, except for Pb whose concentration in groundwater were higher if compared to Brazilian legislation.

Inventário das áreas de concentração de poços tubulares na zona urbana de Londrina (PR) e implicações ambientais

The need for new means of obtaining good quality water required in many localities the urgency of the drilling of deep wells to capture groundwater. In this study we sought to first identify the wells within the city of Londrina (PR) for further understanding of the logic of the rental process tube wells in specific places where there is a greater concentration of them. To this end, we used the database of wells drilled in Londrina (PR) produced by SUDERHSA (Superintendencia de Desenvolvimento de Recurso Hidricos e Saneamento Ambiental) as well as research in the field. It was found that the concentration of wells is mostly restricted to two areas of the city in time, the central area and an industrial area. Since specifically, in the central area, is a high concentration of vertical condominiums. It also discusses the likely impacts from the exploitation of local groundwater sources, often excessive and concentrated, and just supervised by responsible agencies. In addition, efforts will be to explain the reason for this concentration of wells in the locations highlighted.