Fitorremediação como tratamento de chorume de aterro sanitário.

Abstract

The present study aims to assess the modifications that occurred within the effluent from a landfill in Uberlândia when placed in the constructed wetland that contained Leersia hexandra Sw or Hygrophila costata ness. The parameters pH, percentage of saturated oxygen saturation, dissolved oxygen concentration, conductivity, resistivity, total solids, chemical demand of oxygen and heavy metals, were analyzed with different hydraulic detention times (HDT): 3, 5 and 7 days. Besides that, it was realized a mathematical modeling which could interpret the dynamic of the phenomenon through the finite difference theory. The modelling used the software GeoGebra and with its bivariate analysis tools it was possible to generate previsions for how the future values of the parameters would be, taking in consideration the values acquired experimentally. The heavy metals concentration presents in the diluted effluent were very small and were within the standards of the legislation. However, for the concentration of Aluminum, Barium, Calcium, Cobalt, Chromium, Lithium, Magnesium, Lead, Strontium and Vanadium, in the HDT of 3 days, the constructed wetland with Leersia hexandra exhibited a higher amount of elements than the others constructed wetlands; the concentration of Potassium, Manganese, Rubidium and Zinc show a higher concentration in the constructed wetland Hygrophila costata and the parameters Cobber and Gallium show a higher concentration in the constructed wetland that did not have any kind of vegetable species (control). The mathematical modelling proves to be compatible with the experimentation, with few relative errors in the identification in the standards of collected data. The results display that the modelling can be useful for predictions in the physical-chemical parameters of effluent quality when using the constructed wetland.