Caracterização de solos residuais para infiltração de efluente de estação de tratamento de esgoto

Abstract

95Eng Sanit Ambient | v.X n.X | xxx/xxx 20XX | 95-102 RESUMOOs efeitos das alterações climáticas e a crescente demanda de água para os variados consumos vão levar ao reúso de águas residuárias tratadas (ART). A recarga de aquíferos com ART pode constituir uma alternativa para o restabelecimento de volumes de água subterrânea que poderão ser utilizados para satisfazer parte daquelas atividades, especialmente em regiões de escassez de água ou onde sua qualidade não é adequada para uso. Uma pesquisa de dois anos realizada na estação de tratamento de esgoto de Vila Fernando (Guarda, Portugal) mostrou que as caraterísticas das ART são adequadas para que o efluente seja infiltrado no solo visando à recarga de aquífero. Como a área em estudo é vasta e dada a necessidade de considerar várias restrições técnicas, ambientais e econômicas, foi aplicada uma análise multicritério baseada em Sistemas de Informação Geográfica para encontrar o local mais adequado para a infiltração de ART. Recolheu-se uma amostra de solo para análise, na Quinta de Gonçalo Martins (Guarda, Portugal), tendo os resultados indicado que tal solo apresentava características favoráveis à infiltração de ART. Palavras ABSTRACTThe effects of climate change and the increasing demand of water for domestic, industrial and agricultural uses will lead to the use of treated wastewater (reclaimed water). The aquifer recharge with reclaimed water can be an alternative for restoring volumes of water to aquifers, which may afterwards be used to satisfy those demands, especially in regions with water scarcity or where water presents poor quality. A two-year research conducted in the sewage treatment plant of Vila Fernando (Guarda, Portugal) has shown that the characteristics of reclaimed water are adequate to be infiltrated into the soil for aquifer recharge. As the study area for infiltration was very large and it was necessary to consider several technical, environmental and economic constraints, a multi-criteria analysis based on Geographic Information Systems was used in order to find the most suitable site for reclaimed water infiltration. Soil sample was collected at Quinta Gonçalo Martins (Guarda, Portugal) for analysis, and the results have indicated that the site has favorable characteristics for reclaimed water infiltration.

Influence of Hydraulic Conditions on Reclaimed Water Polishing Using Soil and Sand Columns

“…A granitic residual soil was collected at the Quinta de Gonçalo Martins (Guarda, Portugal) [7]. A component less than 0.075 mm (fine soil) was extracted from the soil, as this is where the most reactive soil fractions are found, namely silt and clay.…”

Analysis of factors that influence the occurrence of erosive branches on the left margin of a urban gully in Bauru/SP: case of COHAB-16 / Análise de fatores que influenciam a ocorrência de ramificações erosivas à margem esquerda de uma boçoroca urbana em Bauru/SP: caso COHAB-16

“…The trenches stop the peak discharges and promote the aquifer recharge and treatment of runoff through infiltration into the soil. They must be disposed upstream of the conventional pluvial system, be long, narrow, and deep (SILVA, 2007). The great advantage of this technique is that it does not need a large available area for its installation, since its depth is the most significant element for efficiency.…”

Removal of Cr, Cu and Zn from liquid effluents using the fine component of granitic residual soils

“…The Quinta de Gonçalo Martins (Guarda), in the Beira Interior region of Portugal, was selected for TWW infiltration from the WWTP of Vila Fernando [21,22] (Figure 1), using for example infiltration, retention or detention basins, like suggested by [19]. From a soil sample (Figure 2(a)) a fraction with less than 0.075 mm (fine soil) was extracted (Figure 2(b)) for the sorption experiments, as it is the most reactive fractions of the soil, namely silt and clay.…”