Fito-ETAR uma tecnologia aplicada ao tratamento de águas residuais: análise do comportamento hidráulico

Mestrado em Engenharia do Ambiente - Instituto Superior de AgronomiaIt became increasingly necessary to promote the use of low-cost technologies (in the construction and maintenance) on the implementation of sanitation in small agglomerations, yet never failing to ensure appropriate treatment efficiencies. The construction of constructed wetlands, in these rural areas allows the reproducing of mechanisms of degradation of pollutants that occur in natural wetlands, in a system for waste water purification. The process consists of passing the wastewater through a medium (usually after being pre-sedimented), where, roots of macrophytes and microbial communities that degrade organic matter in wastewater assimilating the nutrients existing in it, grow. The study of the hydraulic behavior of these alternative systems of sanitation was based on the analysis of constructed wetland of Barroca D'Alva in Alcochete with a subsurface horizontal flow. The performance evaluation and effectiveness of the tracer (potassium bromide) introduced, the measurement of water level inside the bed and the analysis of the hydrographs of the flow, allowed a study of the hydraulic behavior and also the development of a simplified one-dimensional model applied to the transport that occurs within the bed, which allows to model the detention times of a non reactive solute