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espanolLa reutilizacion de aguas grises (AG) contribuye a la preservacion del agua y a disminuir la demanda de agua potable. En busca de potenciar esta alternativa en Portugal, se diseno y evaluo financieramente un sistema hidrosanitario con reutilizacion de AG en un edificio multifamiliar, considerando la aceptacion de los usuarios y los sistemas de tratamiento del AG para cumplir con los estandares de calidad para reuso. Los potenciales usuarios aceptaron el reuso de AG provenientes de la ducha, lavamanos y bide, en la descarga de inodoros y riego de jardines. El sistema propuesto incluye el tratamiento del AG con reactores biologicos de membrana (MBR). Se presento un periodo de retorno de 24 anos y un valor presente neto de 14.775,18 USD, demostrando la viabilidad del sistema y logrando una reduccion anual en el consumo de agua del 33 % (i.e. 3.351,92 m3), contribuyendo al uso eficiente del recurso a nivel urbano. EnglishGreywater reuse (GWR) in the domestic sector is increasingly recognized as an alternative to face the growing water scarcity. GWR provides an alternative water source (AWS) for purposes that do not require potable water quality. Aiming at promoting AWS implementation in Portugal, a GWR hydro-sanitary system was designed and financially assessed for a multifamily building (72 flats). Social acceptancy of sanitary devices and treatment systems that fulfil quality standards for water reuse was addressed. Consultation with potential users allowed identifying GWR acceptance for water from shower, washbasin and bidet for end-uses such as toilet flushing and garden irrigation. The system included a commercial treatment consisting on Membrane Bioreactor, and had 24 years payback period, Net Present Value of 14.775,18 USD, and annual potable water savings of 33 % (3.351,92 m3). Thus, the designed system was technical, social and financially feasible and can contribute to urban water use efficiency.

Reutilización de aguas grises domésticas para el uso eficiente del recurso hídrico: aceptación social y análisis financiero. Un caso en Portugal