Crescimento de leguminosas submetidas a diferentes níveis de adubação com fosfato de rocha.

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Caracterização de um "blend" tropical elaborado com polpas de maracujá, acerola e taperebá.

bitstream/item/27821/1/BPD-59.pdfVersão eletrônica. 1ª impressão: 2009

Bacterial biofilm supported on granular activated carbon and on natural zeolites- an application to wastewater treatment

The removal of many heavy metals from industrial wastewater is one of the most important environmental problems to be solved today. The retention of this contaminants by a biofilm supported on granular activated carbon or on natural zeolites is one of the promising technologies for the reduction of this problem, because it is cheap and it removes a broad range of substances, heavy metals and organic compounds. This study aims the development of a system of two mini-columns in series for the removal of chromium (VI) using a biofilm of Arthrobacter viscosus supported on two different materials: granular activated carbon and natural zeolite. The effect of the regeneration of granular activated carbon was also studied.Ministério da Ciência e Tecnologia. Fundação para a Ciência e Tecnologia (FCT) - POCTI/EQU/12017/2000 , SFRH/BD/8646/2002

Biosorption of Cr (VI) using a bacterial biofilm supported on granular activated carbon and on zeolite

Two mini-columns partially filled with granular activated carbon (GAC) and/or a natural zeolite, covered by a bacterial biofilm of Arthrobacter viscosus, were used in a continuous flow system to remove Cr (VI) from solutions with initial concentration of 70 mg/l and a working pH ranging between 4.5 and 5.5. Three different set-up’s were used: two columns in series filled GAC covered with a biofilm, two columns in series filled with zeolite covered with a biofilm and a column filled with GAC followed by another column filled with zeolite, both supports covered with biofilm. Comparatively, the biosorption system supported on GAC reaches similar removal values, 19%, as the one supported on the zeolite, 18%, but when these two beds are used in combination better performances are reached, i.e. 42% removal. The maximum uptake values ranged from 0.57 mgCr/gSupport to 3.58 mgCr/gSupport. The interactions between metal ions and functional groups on the cell wall surface of the biomass were confirmed by FTIR. GAC was regenerated with steam draughting and reused twice. The first regeneration caused a decrease in the removal capacity of 38% and the second regeneration caused a total decrease in the removal capacity of 76%.La Habana UniversityMinistério da Ciência e Tecnologia; FEDERFundação para a Ciência e a Tecnologia (FCT

Controles alternativos de podridões pós-colheita em manga.

O presente trabalho teve como objetivo avaliar a eficiência de algumas medidas de controles alternativos no combate dessas deteriorações , assim como minimizar ou eliminar o emprego de agrotóxicos nos tratamentos pós-colheita para preservar a qualidade mercadológica da manga, a fim de satisfazer às exigências dos mercados consumidores