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A poly-epsilon-caprolactone based biofilm carrier for nitrate removal from water

Nitrate 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...

Poly (ɛ-caprolactone) as biofilm support and carbon source for groundwater deni...

Influence of carrier concentration on the control of Galactomyces geotrichum bu...

The present work aims to evaluate a strategy to solve Galactomyces geotrichum bulking based on the incorporation of a biofilm carrier in activated sludge systems. For this study, four sequencing batch reactors (SBR) were operated without (SBR1) and with a carrier for biofilm growth (5% [SBR2], 10% [SBR3], and 20% [SBR4] of the reactor volume). As expected, G. geotrichum bulking was observed in the SBR operating...

Tristeza parasitária bovina no Sertão da Paraíba

Descrevem-se 24 surtos de tristeza parasitária bovina no sertão paraibano, sendo 18 de anaplasmose por Anaplasma margimale, dois de babesiose por Babesia bigemina, dois por Babesia não identificada e dois por infecção mista de A. marginale e Babesia sp. Os surtos ocorreram entre agosto de 2007 a outubro de 2009, porém, com uma concentração dos surtos no final do período chuvoso e início do período seco de cada ...

Datação, autenticidade, materiais e pigmentos. Estudos laboratoriais sobre faia...

Influence of humic substances on biofilm structure and its microbial diversity ...

Doctoral dissertation for PhD degree in Chemical and Biological Engineering ; Natural organic matter (NOM) is ubiquitous in terrestrial and aquatic ecosystems; it comprises an important source of carbon for river biofilms which are major sites of carbon cycling in streams. NOM may be classified in two main categories: non-humic and humic substances (HSs). About 75 % of the dissolved organic carbon (DOC) in riv...

Biofilms formed on humic substances : response to flow conditions and carbon co...

Stream biofilms are exposed to dynamic conditions of flow velocity and organic carbon availability. Thus, the aim of this study was to investigate the response of biofilms formed with and without humic substances (HSs) to an increase in flow velocity (0.04–0.10 m s-1) and HSs concentration (9.7 ± 1.0 to 19.8 ± 0.4 mg L-1 C). The highest amount of biofilm, measured as volatile suspended solids and total countabl...

Situação epidemiológica da brucelose bovina no Estado do Tocantins

Realizou-se um estudo para caracterizar a situação epidemiológica da brucelose bovina no Estado do Tocantins, entre fevereiro de 2002 e agosto de 2003. O Estado foi dividido em seis áreas com características produtivas homogêneas (circuitos produtores). Para cada área, foi calculada uma amostragem simples aleatória de 300 propriedades, com o objetivo de estimar a prevalência de focos de brucelose além da preval...

Pesquisa de propriedades anti-inflamatórias da planta Prunus lusitanica = Searc...

As formulações actuais para aplicação na pele devem satisfazer requisitos de eficácia elevada, compatibilidade cutânea e atracção estética. É geralmente aceite que o desempenho de um produto cosmético está relacionado com a tecnologia de todas as etapas da formulação. Assim, uma forma galénica óptima é um pré-requisito tão necessário para sucesso no mercado como a incorporação dos ingredientes activos adequados...

Quantification of humic acids in surface water: effects of divalent cations, pH...

Humic acids (HAs) content of raw water is an important analytical parameter in water treatment facilities because HAs in the presence of chlorine may lead to the formation of dangerous by-products (e.g., trihalomethanes). The concentration of HAs in water is not directly accessible by common analytical methods due to their heterogeneous chemical structure. The aim of this study was to compare two methods to ass...