Encontrados 45 documentos, a visualizar página 1 de 5
The influence of evapotranspiration on vertical flow subsurface constructed wet...
Bialowiec, Andrzej; Albuquerque, Antonio; Randerson, PeterThis paper presents an example of the importance of evapotranspiration in constructed wetlands, with vertical subsurface flow, comparing different methods of treatment efficiency calculations and discussing the influence of evapotranspiration on removal rates. The application of reed, marked by high transpiration ability, is a cheap and effective method of landfill leachate disposal. A 2-year study examined the...
A poly-epsilon-caprolactone based biofilm carrier for nitrate removal from water
Rodrigues, A. L.; Machado, A.; Nobrega, J. M.; Albuquerque, Antonio; Brito, A. G.; Nogueira, ReginaNitrate removal from water has been accomplished by heterotrophic biofilms using organic carbon as a source of reducing power. To overcome the natural limitation in organic carbon in water, a poly-epsilon-caprolactone based biofilm carrier that serves simultaneously as a biofilm carrier and as a source of organic carbon was developed and tested in the present work. The feasibility of the new biofilm carrier for...
GIS-based site selection for agricultural irrigation with reclaimed water
Sardinha, Natália; Albuquerque, António; Silva, Flora; Scalize, PauloMost of the treated wastewater produced in the Cova da Beira region (Portugal) is discharged into streams. It is believed this reclaimed water could be reused for agricultural irrigation since it is a sector with high water demand. However, it is necessary evaluating if its quality is suitable for irrigation. From flow rate data and physical-chemical analyses produced in the years 2009, 2010 and 2011, and from ...
Effect of vegetation on the performance of horizontal subsurface flow construct...
Mesquita, Maria da Conceição; Albuquerque, Antonio; Amaral, Leonor; Nogueira, ReginaThis research evaluates the effect of both organic and ammonia loading rates and the presence of plants on the removal of chemical oxygen demand and ammonia nitrogen in horizontal subsurface flow constructed wetlands, 2 years after the start-up. Two sets of experiments were carried out in two mesocosms at different organic and ammonia loading rates (the loads were doubled); one without plants (control bed), the...
Biological and technical study of a partial-SHARON reactor at laboratory scale:...
Gonzalez-Martinez, A.; Calderon, K.; Albuquerque, Antonio; Hontoria, E.; Gonzalez-Lopez, J.; Guisado, I.; Osorio, FranciscoThis study was on the technical and biological characteristics of a partial-SHARON submerged-filter bioreactor of 3 L. The main focus was the influence of the hydraulic retention time (HRT) on biofilms. For this purpose, we used molecular tools based on the partial 16S rRNA genes. The results showed that the HRT may affect the nitrification processes of a bioreactor using synthetic wastewater containing 600 mg/...
Biodegradability enhancement and detoxification of cork processing wastewater m...
Santos, Diana; Silva, L.; Albuquerque, Antonio; Simoes, Rogerio; Gomes, ArlindoCork boiling wastewater pollutants were fractionated by sequential use of four ultrafiltration membranes and five fractions were obtained: four retentates (>100, 50-100, 20-50 and 10-20 kDa) and one permeate (<10 kDa); which were used to study the correlation of molecular size with biodegradability and toxicity before and after ozonation. The results show that molecular size is correlated with organic load and ...
Toxicity reduction and biodegradability enhancement of cork processing wastewat...
Gomes, Arlindo; Silva, L.; Simoes, Rogerio; Canto, N.; Albuquerque, AntonioBiodegradability enhancement and detoxification of cork boiling wastewater (CBW) are required for the successful implementation of biological treatment options. We studied the possibility of achieving these goals through ozonation pre-treatment by experimenting on the effect of ozone dose and pH. The CBW used had a pH of 5.81, a chemical oxygen demand (COD) of 1,865 mg L-1, a biochemical oxygen demand (BOD5) of...
Remoção de metais pesados em solos residuais
Dias, Luís; Albuquerque, António; Silva, FloraUma das aplicações mais comuns da reutilização de águas residuais tratadas (ART) é a recarga de aquíferos, que é especialmente útil em zonas com deficit hídrico, como é o caso da região da Beira Interior. No entanto, estas ART apresentam cargas residuais que podem causar impactes ambientais significativos no solo ou água. Entre os poluentes mais preocupantes encontram-se os metais pesados (Cd, Cr, Cu, Fe, Hg, N...
Remoção de metais pesados em solos residuais
Dias, Luís; Albuquerque, António; Silva, FloraA reutilização de águas residuais tratadas para a recarga de aquíferos é uma prática que pode contribuir para a reposição de volumes de água no solo, que pode ser muito vantajoso em áreas com défice hídrico ou com sobre-exploração de águas subterrâneas. Contudo, as cargas residuais das ART (p.e. matéria orgânica, nutrientes, metais pesados e patogénicos) podem constituir uma desvantagem para a qualidade da água...
Utilização de solos residuais para infiltração de águas residuais tratadas
Silva, Flora; Albuquerque, António; Arrobas, Margarida; Cavaleiro, Victor; Marecos do Monte, Helena; Scalize, PauloA reutilização de águas residuais tratadas (ART) é praticada, na maioria dos casos, como uma estratégia de conservação da água em regiões onde os recursos hídricos são escassos, mas também por motivos ambientais, a fim de se preservar a qualidade da água de meios recetores, reduzindo a descarga de efluentes de estações de tratamento de águas residuais (ETAR). Nos próximos anos, a região da Beira Interior (Portu...
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