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In the Bankfiltration (BF) technique, wells are built near a surface water body, and the pumping action creates a difference in hydraulic head between the river and the aquifer, leading the river water to flow through the porous medium towards the well. On the flow pathway of the induced water through the subsurface, physical, chemical and biological processes work for contaminant removal, and the pumped water presents a higher quality. The BF is an efficient alternative method for water treatment, in which one of the immediate benefits is the ability to remove or reduce several contaminants, minimizing the need for chemical use in conventional treatment and reducing costs. The BF has been used in several countries in the water industry, serving as the only treatment necessary or at least as a pre-treatment of contaminated surface water. The removal of contaminants depends on various conditions of ecohydrogeological environment. This paper describes the fundamentals of the bankfiltration processes and presents a case study carried out on the river Beberibe in Pernambuco State, Brazil. Hydrogeological studies, tests for hydraulic conductivity, potentiometric monitoring and water quality monitoring were performed. Results have showed that the pumped water is a mixture of groundwater and infiltrated surface water by induced recharge and confirmed that the produced water has higher quality than river water, within potability standards.

FILTRAÇÃO EM MARGEM PARA INDUÇÃO DE RECARGA E MELHORIA DA QUALIDADE DE ÁGUA – ESTUDO DE CASO: RIO BEBERIBE