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Estudo da viabilidade do aproveitamento de lamas e águas de lavagem de filtros ricas em ferro no tratamento de águas residuais
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Advisor(s)
Abstract(s)
O tratamento de água e água residual é crucial para garantir a saúde pública, preservar
o meio ambiente e promover a sustentabilidade. Ao tratar a água potável, é possível
remover contaminantes e fornecer água segura para consumo humano. Para além disso,
o tratamento adequado da água residual protege os ecossistemas aquáticos e possibilita a
reutilização da água tratada, reduzindo a procura por água potável. No entanto, enfrenta
desafios que exigem investimentos em tecnologias inovadoras e políticas públicas
eficientes. Priorizar o tratamento de água e água residual é fundamental para um futuro
promissor e equilibrado.
Este estudo teve como objetivo avaliar a viabilidade da utilização das lamas ricas em
ferro e das águas de lavagem de filtros provenientes de uma estação de tratamento de
águas (ETA) para integração nos processos de uma estação de tratamento de águas
residuais (ETAR). A investigação procurou determinar se esses resíduos poderiam ser
integrados de forma benéfica no processo de tratamento biológico, visando diminuir os
tempos de sedimentação e a qualidade do efluente final.
Foram realizados testes de coagulação/floculação com as águas residuais
provenientes da ETAR de Fornos (gerida pela empresa SIMDOURO) juntamente com as
lamas ricas em ferro e as águas de lavagem de filtros da ETA de Castelo de Paiva (gerida
pela empresa Águas do Douro e Paiva).
Foram analisados 6 parâmetros, sendo eles, pH, condutividade, turvação, lamas,
CQO e ferro total. Os resultados demonstraram que não seria possível o uso das lamas
ricas em ferro, no reator biológico, devido ao produto final apresentar uma cor indesejável
e também por produzir um maior teor de lamas. No entanto, a água de lavagem de filtros
(usada como coagulante) apresentou resultados promissores, melhorando a clarificação
da água residual e reduzindo o seu tempo de sedimentação, quando foi usado um volume
de 140 mL de coagulante por L de água residual.
Water and wastewater treatment are crucial for ensuring public health, preserving the environment, and promoting sustainability. By treating drinking water, it is possible to remove contaminants and provide safe water for human consumption. Additionally, proper treatment of wastewater protects aquatic ecosystems and allows the reuse of treated water, thereby reducing the need for drinking water. However, it faces challenges that require investments in innovative technologies and efficient public policies. Prioritizing water and wastewater treatment is essential for a promising and balanced future. This study aimed to evaluate the feasibility of using iron-rich sludge and filter backwash water from a water treatment plant (WTP) for integration into the processes of wastewater treatment (WWTP). The research sought to determine whether these residues could be beneficially integrated into the biological treatment process to reduce settling times and improve the quality of the final effluent. Coagulation/flocculation tests were performed using wastewater from the Fornos WWTP (managed by the SIMDOURO company) along with iron-rich sludge and filter backwash water from the Castelo de Paiva WTP (managed by Águas do Douro e Paiva company). Six parameters were analyzed, including pH, conductivity, turbidity, sludge, COD, and total iron. The results demonstrated that the use of iron-rich sludge in the biological reactor would not be feasible due to the undesirable color of the final product and its tendency to generate higher sludge content. However, the filter backwash water (used as a coagulant) showed promising results by improving the clarification of the wastewater and reducing its sedimentation time when a volume of 140 mL of coagulant per liter of wastewater was used.
Water and wastewater treatment are crucial for ensuring public health, preserving the environment, and promoting sustainability. By treating drinking water, it is possible to remove contaminants and provide safe water for human consumption. Additionally, proper treatment of wastewater protects aquatic ecosystems and allows the reuse of treated water, thereby reducing the need for drinking water. However, it faces challenges that require investments in innovative technologies and efficient public policies. Prioritizing water and wastewater treatment is essential for a promising and balanced future. This study aimed to evaluate the feasibility of using iron-rich sludge and filter backwash water from a water treatment plant (WTP) for integration into the processes of wastewater treatment (WWTP). The research sought to determine whether these residues could be beneficially integrated into the biological treatment process to reduce settling times and improve the quality of the final effluent. Coagulation/flocculation tests were performed using wastewater from the Fornos WWTP (managed by the SIMDOURO company) along with iron-rich sludge and filter backwash water from the Castelo de Paiva WTP (managed by Águas do Douro e Paiva company). Six parameters were analyzed, including pH, conductivity, turbidity, sludge, COD, and total iron. The results demonstrated that the use of iron-rich sludge in the biological reactor would not be feasible due to the undesirable color of the final product and its tendency to generate higher sludge content. However, the filter backwash water (used as a coagulant) showed promising results by improving the clarification of the wastewater and reducing its sedimentation time when a volume of 140 mL of coagulant per liter of wastewater was used.
Description
Keywords
Água residual Lama férrica Estação de tratamento de água Coagulação Floculação Reatores biológicos Wastewater Ferric sludge Water treatment plant Coagulation Flocculation Biological reactors