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A emergência de bactérias multirresistentes está a ocorrer um pouco por todo o mundo sendo as estações de tratamento de águas residuais (ETARs) a principal fonte desses microrganismos. Para remover essas bactérias, o carvão ativado e o biochar são possíveis tecnologias que, devido às suas propriedades ajustáveis, podem ser adsorventes adequados para diferentes tipos de microrganismos, por exemplo, bactérias Gram positivo ou Gram negativo. O objetivo deste estudo foi testar dois materiais diferentes, o carvão ativado (CC) comercializado para fins de tratamento de água e um biochar produzido em laboratório (CS), para reduzir o conteúdo de bactérias comumente detetadas em águas residuais.
Os ensaios foram realizados utilizando o carvão CC em duas granulometrias diferentes e o biochar CS apenas numa granulometria contra diferentes estirpes bacterianas (Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus) e em águas residuais.
No geral, as todas as estirpes bacterianas utilizadas apresentaram bons resultados na adsorção à superfície dos diferentes materiais utilizados. No entanto, no ensaio com as águas residuais foi verificada menor remoção de bactérias.
The rapid emergence of multi-resistant bacteria is occurring worldwide being wastewater treatment plants a major source of these microorganisms. To remove these bacteria possible strategies are those involving carbon materials that due to their tunable properties can be suitable adsorbents for different types of microorganisms, for example Gram + or Gram – bacteria. The objective of this study was to test two different carbon materials an activated carbon (CC) commercialized for water treatment purpose and a lab made biochar (CS) to reduce the content of bacteria commonly detected in wastewater. The assays were made using the carbon CC in two different granulometries and the biochar CS in one granulometry against different strains (Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus) and on wastewater. In general, all bacterial strains presented good results of adsorption of bacteria with the different carbon materials. However, it was verified a lower bacteria removal efficiency in the assay with wastewater.
The rapid emergence of multi-resistant bacteria is occurring worldwide being wastewater treatment plants a major source of these microorganisms. To remove these bacteria possible strategies are those involving carbon materials that due to their tunable properties can be suitable adsorbents for different types of microorganisms, for example Gram + or Gram – bacteria. The objective of this study was to test two different carbon materials an activated carbon (CC) commercialized for water treatment purpose and a lab made biochar (CS) to reduce the content of bacteria commonly detected in wastewater. The assays were made using the carbon CC in two different granulometries and the biochar CS in one granulometry against different strains (Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus) and on wastewater. In general, all bacterial strains presented good results of adsorption of bacteria with the different carbon materials. However, it was verified a lower bacteria removal efficiency in the assay with wastewater.
Descrição
Tese de mestrado, Controlo de Qualidade e Toxicologia dos Alimentos, Universidade de Lisboa, Faculdade de Farmácia, 2017
Palavras-chave
Carvão ativado Biochar Adsorção Biofilmes Bactérias multirresistentes Teses de mestrado - 2017
