Tratamento e destino final de águas residuais no solo

Ana Carolina Silva Gonçalves Infante Rodrigues

Key information

Authors:

Ana Carolina Silva Gonçalves Infante Rodrigues (Ana Carolina Silva Gonçalves Infante Rodrigues)

Supervisors:

Filipa Maria Santos Ferreira (Filipa Maria Santos Ferreira)

Published in

November 30, 2021

Abstract

In this field, it was mentioned three types of land treatments: rapid infiltration, slow infiltration and overland-flow. Throughout the thesis, there were described the principles, limitations, applicability and sizing criteria of each of these treatments processes. It was described also the soil characteristics that have an influence on wastewater treatment, especially the permeability of the soil on the site and the water table’s existence. The influence of the plants and soil on wastewater treatments was also described. Based on this information, it was developed a method, in a form of a flow chart, for the selection of the land treatment to be applied in each case. The proposed methodology is applied for illustrative and merely academic purpose to two cases of study, in the Aveiro area and in Calheta, Cap-Vert, where the land treatment solutions are used, and it’s also presented the sizing and cost estimates of both systems. In the first case, the adopted solution mitigated the problems associated with a possible failure of the pumping station, by diverting the flow basin to a rapid infiltration basin and subjecting it to a screening as pre-treatment. In the second case, the effluent from a WWTP was subjected to the pre-treatment by screening and grit removal, a primary treatment in a septic tank and subsequently treatment and a final disposal through the implementation of a rapid infiltration system.