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Licenciamento de Estações de Tratamento de Águas Residuais Urbanas para Produção de Água para Reutilização
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 2.35 MB | Adobe PDF |
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Abstract(s)
Nas últimas décadas, a água potável tem vindo a tornar-se um recurso cada vez mais escasso, pelo que existe uma necessidade constante de desenvolver novas formas de tratar águas residuais, de forma a devolvê-las aos recursos naturais sem alterar o equilíbrio dos ecossistemas.O impacte que as alterações sociais, económicas e ambientais têm sobre os recursos hídricos, juntamente com o atual e futuro cenário de escassez de água, constituem motivos que exigem a introdução de novas abordagens para a gestão da água e a procura de novas fontes de água. A reutilização de águas residuais tratadas constitui uma alternativa para fazer face à procura crescente da água. Os usos de uma água residual tratada devem ser economicamente viáveis, ambientalmente seguros e aceites pela opinião pública. A qualidade da água residual tratada, sendo um aspeto extremamente relevante, deve estar de acordo com as normas de qualidade previstas na legislação portuguesa. Face a este problema é oportuno explorar a possibilidade do uso de água residual tratada proveniente de ETAR urbanas, sendo necessário proceder ao Licenciamento das infraestruturas. No estudo desenvolvido foram consideradas quatro ETAR localizadas no centro de Portugal. Nos casos de estudo apresentados constatou-se que há necessidade de introduzir tratamento terciário em duas instalações, este deve ser um processo de filtração seguido de desinfeção por módulos UV, por forma a atingir os valores indicados como norma de qualidade. Também será necessário preceder a uma periodicidade de amostragem, de acordo com o descrito no Decreto-Lei nº 119/19, de 21 de agosto, tendo em conta a capacidade mensal da instalação para tratar efluente e os resultados das análises físico-químicas e microbiológicas que são disponibilizadas no sítio da internet da empresa Águas do Centro Litoral, SA.
Over the last decades, drinking water has become an increasingly scarce resource, which is why there is a constant need to develop new ways of treating wastewater to return it to natural resources without disrupting the balance of ecosystems.The impact that social, economic, and environmental changes have on water resources, together with the current and future scenario of water scarcity, require innovative approaches to water management and the search for new water sources. Reusing treated wastewater is an alternative to meet the growing water demand. The uses of treated wastewater must be economically viable, environmentally safe and accepted by public opinion. The quality of the treated wastewater is an extremely relevant aspect, so the quality of the water must be under the quality standards provided for in Portuguese legislation. Given this problem, it is opportune to explore the possibility of using treated wastewater from an urban wastewater treatment plant (WWTP), and it is necessary to proceed with the licensing of infrastructures. Four WWTPs located in the center of Portugal were considered in the study developed. In the case studies presented, it was found that there is a need to introduce tertiary treatment in two facilities. That should be a filtration process followed by disinfection by UV modules to achieve the values indicated as a quality standard. It will also be necessary to precede a sampling periodicity, as described in Law decree No 119/2019, August 21st, considering the monthly capacity of the facility to treat effluent and the results of the physical-chemical and microbiological analyses that are available on the website of the company Águas do Centro Litoral, SA.
Over the last decades, drinking water has become an increasingly scarce resource, which is why there is a constant need to develop new ways of treating wastewater to return it to natural resources without disrupting the balance of ecosystems.The impact that social, economic, and environmental changes have on water resources, together with the current and future scenario of water scarcity, require innovative approaches to water management and the search for new water sources. Reusing treated wastewater is an alternative to meet the growing water demand. The uses of treated wastewater must be economically viable, environmentally safe and accepted by public opinion. The quality of the treated wastewater is an extremely relevant aspect, so the quality of the water must be under the quality standards provided for in Portuguese legislation. Given this problem, it is opportune to explore the possibility of using treated wastewater from an urban wastewater treatment plant (WWTP), and it is necessary to proceed with the licensing of infrastructures. Four WWTPs located in the center of Portugal were considered in the study developed. In the case studies presented, it was found that there is a need to introduce tertiary treatment in two facilities. That should be a filtration process followed by disinfection by UV modules to achieve the values indicated as a quality standard. It will also be necessary to precede a sampling periodicity, as described in Law decree No 119/2019, August 21st, considering the monthly capacity of the facility to treat effluent and the results of the physical-chemical and microbiological analyses that are available on the website of the company Águas do Centro Litoral, SA.
Description
Keywords
Estação de tratamento de água residual Água residual tratada Reutilização Licenciamento Usos não potáveis