Reverse Osmosis
Mostrando 25-36 de 44 artigos, teses e dissertações.
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25. Dialysis water treated by reverse osmosis decreases the levels of C-reactive protein in uremic patients
Atherosclerosis is a major complication of chronic renal failure. Microinflammation is involved in atherogenesis and is associated with uremia and dialysis. The role of dialysate water contamination in inducing inflammation has been debated. Our aim was to study inflammatory markers in patients on chronic dialysis, before and 3 to 6 months after switching th
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-05
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26. Recuperação de solvente em miscelas oleo de soja/hexano utilizando tecnologia de membranas. / Soja/hexano solvent oil recovery in miscelas using technology of membranes.
Soybean oil is industrially obtained by hexane extraction, producing an oil/hexane miscella that is submitted to distillation for solvent recovery. The process with membranes present low energy consumption and have been proposed to replace or complete the traditional operations in removal of solvent. Furthermore, the use of this technology might result in co
Publicado em: 2005
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27. The transfer of metals for the foods and it possible relationship with the consumer s health / A transferência de metais para os alimentos e sua possível relação com a saúde do consumidor
With the preocupation gone back to the quality of the foods of human consumption, the present research has the purpose of evaluating the transfer of the metals aluminum (Al), chrome (Cr), iron (Fe) and nickel (Ni) during the cooking of the foods rice and bean in containers of aluminum and stainless steel. Initially they were prepared waters patterns, under d
Publicado em: 2005
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28. Use of reverse osmosis membranes for the separation of lemongrass essential oil and supercritical CO2
Although it is still used very little by industry, the process of essential oil extraction from vegetable matrices with supercritical CO2 is regarded as a potentially viable technique. The operation of separating the extract from the solvent is carried out by reducing the pressure in the system. Separation by membranes is an alternative that offers lower ene
Brazilian Journal of Chemical Engineering. Publicado em: 2004-06
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29. Aplicação dos processos de separação por membranas para produção de suco clarificado e concentrado de camu camu (Myrciaria dubia)
The objective of this thesis was to evaluate membrane separation processes for the clarification and concentration of camu camu juice. The juice obtained by the de-pulping of the fruit was initially submitted to an enzyme treatment to reduce the viscosity and facilitate the following process of clarification. Clarification was carried out using microfiltrati
Publicado em: 2002
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30. Estudo da utilização dos processos de separação por membranas para obtenção de suco de acerola clarificado e concentrado
Acerola juice clarification was studied using membrane separation processes. Single strength acerola juice and enzymatically treated juice were processed employing microfiltration and ultrafiltration membrane systems at different transmembrane pressures. In spite of the fact that the juice obtained by ultrafiltration presented a lower haze value than the one
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/09/1999
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31. Contribution to the study of the concentration of extract of coffee by reverse osmosis / Contribuição ao estudo da concentração de extrato de cafe por osmose inversa
A concentração de extrato de café por osmose inversa foi estudada a nlvel de laboratório, visando um melhor conhecimento do comportamentoe da qualidade do extrato de café assim concentrado. Extrato de café, fornecido por indústria de café solúvel a 200Brix, foi utilizado neste processo. Foram estudados os efeitos de pré-tratamento aplicado na maté
Publicado em: 1982
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32. Estudo da utilização da fase de evaporação constante da secagem na concentração de liquidos
Of the methods available for concentration of liquid foods, special emphasis should be given to evaporation, reverse osmosis and crio-concentration, because they are very well known techniques for concentration at low temperature, although each of them presents disadvantages due to their high investment and/or operation costs. An alternative technique of con
Publicado em: 1980
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33. Adhesion of a Mycobacterium sp. to cellulose diacetate membranes used in reverse osmosis.
The kinetics of adhesion of a Mycobacterium sp. to cellulose diacetate reverse-osmosis membranes is described. This Mycobacterium sp. (strain BT2-4) was previously implicated in the initial stages of reverse-osmosis membrane biofouling at a wastewater reclamation facility. Adhesion of BT2-4 cells to the cellulose diacetate membrane surfaces occurred within 1
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34. Inability of Microorganisms To Degrade Cellulose Acetate Reverse-Osmosis Membranes †
Operational cellulose acetate reverse-osmosis membranes were examined for evidence of biological degradation. Numerous fungi and bacteria were isolated by direct and enrichment techniques. When tested, most of the fungi were active cellulose degraders, but none of the bacteria were. Neither fungi nor bacteria were able to degrade cellulose acetate membrane i
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35. Microbial fouling of reverse-osmosis membranes used in advanced wastewater treatment technology: chemical, bacteriological, and ultrastructural analyses.
Biofouling of reverse-osmosis membranes was investigated at an advanced wastewater treatment facility. Cellulose diacetate membranes operated for approximately 4,000 h became uniformly coated with a mucilaginous fouling layer. The fouling material was approximately 93% water by weight, and nearly 90% of the dehydrated residue was organic in composition. Calc
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36. Gastrointestinal health effects associated with the consumption of drinking water produced by point-of-use domestic reverse-osmosis filtration units.
During a prospective epidemiological study of gastrointestinal health effects associated with the consumption of drinking water produced by reverse-osmosis domestic units, a correlation was demonstrated between the bacterial counts on R2A medium incubated at 35 degrees C and the reported gastrointestinal symptoms in families who used these units. A univariat