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Development of Flotation and Nanofil...

da Cruz Godinho Ribau Teixeira, Margarida Margarida,

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Development of Flotation and Nanofiltration Technologies to Remove Cyanobacteria and Cyanotoxins in Drinking Water Treatment = = Desenvolvimento das Tecnologias de Flutuacao e Nanofiltracao para Remocao de Cianobacterias e Cianotoxinas no Tratamento de Agua para Consumo Humano /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Development of Flotation and Nanofiltration Technologies to Remove Cyanobacteria and Cyanotoxins in Drinking Water Treatment =/ Margarida Margarida da Cruz Godinho Ribau Teixeira.
其他題名:	Desenvolvimento das Tecnologias de Flutuacao e Nanofiltracao para Remocao de Cianobacterias e Cianotoxinas no Tratamento de Agua para Consumo Humano /
作者:	da Cruz Godinho Ribau Teixeira, Margarida Margarida,
面頁冊數:	1 electronic resource (255 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
標題:	Water quality. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29083902
ISBN:	9798819325957

Development of Flotation and Nanofiltration Technologies to Remove Cyanobacteria and Cyanotoxins in Drinking Water Treatment = = Desenvolvimento das Tecnologias de Flutuacao e Nanofiltracao para Remocao de Cianobacterias e Cianotoxinas no Tratamento de Agua para Consumo Humano /
da Cruz Godinho Ribau Teixeira, Margarida Margarida,

Development of Flotation and Nanofiltration Technologies to Remove Cyanobacteria and Cyanotoxins in Drinking Water Treatment =Desenvolvimento das Tecnologias de Flutuacao e Nanofiltracao para Remocao de Cianobacterias e Cianotoxinas no Tratamento de Agua para Consumo Humano /Margarida Margarida da Cruz Godinho Ribau Teixeira. - 1 electronic resource (255 pages)

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Dissolved air flotation (DAF) and nanofiltration were optimised and integrated to remove cyanobacteria and cyanotoxins from drinking water. The removal mechanisms of the most commonly occurring cyanobacteria (cultured cells and aggregates of Microcystis aeruginosa and Plankthotrix rubescens filaments) and cyanotoxins (hepatotoxic microcystins, and neurotoxic anatoxin-a) were investigated, as well as the impact of the water background organic (NOM) and inorganic matrixes, using both model and natural waters.Results showed that coagulation/flocculation/DAF is the best process for clarifying cyanobacterial-rich waters (93-99% chlorophyll a removal), without toxin release to water and with lower NOM effect, using low recycle (8%), and lower coagulant doses, slower coagulation, stronger but shorter flocculation than the conventional coagulation/flocculation/settling.Studies with a negatively charged tight nanofiltration membrane demonstrated that while nanofiltration fluxes of low NOM and moderately hard water are largely influenced by the background pH and calcium hardness, rather than by the type of NOM, anatoxin-a and microcystins are efficiently removed (anatoxin-a by electrostatic interactions and steric hindrance, microcystins mainly by steric hindrance), producing a final water of superior quality, also in terms of NOM content, regardless of the variations in feed water quality (pH, calcium hardness, NOM, toxins) and water recovery rate (up to 90%).

English

ISBN: 9798819325957Subjects--Topical Terms:

556913
Water quality.

Development of Flotation and Nanofiltration Technologies to Remove Cyanobacteria and Cyanotoxins in Drinking Water Treatment = = Desenvolvimento das Tecnologias de Flutuacao e Nanofiltracao para Remocao de Cianobacterias e Cianotoxinas no Tratamento de Agua para Consumo Humano /
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245 1 0 $a Development of Flotation and Nanofiltration Technologies to Remove Cyanobacteria and Cyanotoxins in Drinking Water Treatment = $b Desenvolvimento das Tecnologias de Flutuacao e Nanofiltracao para Remocao de Cianobacterias e Cianotoxinas no Tratamento de Agua para Consumo Humano / $c Margarida Margarida da Cruz Godinho Ribau Teixeira.
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502 $b Ph.D. $c Universidade do Algarve (Portugal) $d 2005.
520 $a Dissolved air flotation (DAF) and nanofiltration were optimised and integrated to remove cyanobacteria and cyanotoxins from drinking water. The removal mechanisms of the most commonly occurring cyanobacteria (cultured cells and aggregates of Microcystis aeruginosa and Plankthotrix rubescens filaments) and cyanotoxins (hepatotoxic microcystins, and neurotoxic anatoxin-a) were investigated, as well as the impact of the water background organic (NOM) and inorganic matrixes, using both model and natural waters.Results showed that coagulation/flocculation/DAF is the best process for clarifying cyanobacterial-rich waters (93-99% chlorophyll a removal), without toxin release to water and with lower NOM effect, using low recycle (8%), and lower coagulant doses, slower coagulation, stronger but shorter flocculation than the conventional coagulation/flocculation/settling.Studies with a negatively charged tight nanofiltration membrane demonstrated that while nanofiltration fluxes of low NOM and moderately hard water are largely influenced by the background pH and calcium hardness, rather than by the type of NOM, anatoxin-a and microcystins are efficiently removed (anatoxin-a by electrostatic interactions and steric hindrance, microcystins mainly by steric hindrance), producing a final water of superior quality, also in terms of NOM content, regardless of the variations in feed water quality (pH, calcium hardness, NOM, toxins) and water recovery rate (up to 90%).
520 $a A flutuacao por ar dissolvido (DAF) e nanofiltracao foram optimizadas e integradas para remover cianobacterias e cianotoxinas de agua para consumo humano. Investigaram-se os mecanismos de remocao de formas celulares, coloniais (Microcystis aeruginosa) e filamentosas (Planktothrix rubescens), de microcistinas (hepatotoxicas) e anatoxina-a (neurotoxica), e a influencia das matrizes organica (NOM) e inorganica da agua usando solucoes modelo e aguas naturais.Demonstrou-se que a coagulacao/floculacao/DAF e o melhor processo para tratamento de aguas ricas em cianobacterias (93-99% remocao de clorofila a), sem libertacao de toxinas na agua - requer baixa recirculacao, menor dose de coagulante, menor agitacao na coagulacao, floculacao mais intensa mas mais curta e tem menor efeito da NOM relativamente a coagulacao/floculacao/sedimentacao convencional.Os estudos de nanofiltracao (com membrana apertada, negativa) demonstraram que o pH e dureza calcica influenciam mais os fluxos de agua moderadamente dura com baixo teor em NOM do que o tipo de NOM, mas que a anatoxina-a e as microcistinas sao eficientemente removidas (anatoxina-a por interaccoes electrostaticas e impedimentos estereoquimicos, microcistinas principalmente por impedimentos estereoquimicos) independentemente das variacoes da qualidade da agua bruta (pH, dureza calcica, NOM, toxinas) e da taxa de recuperacao (ate 90%), produzindo-se uma agua de qualidade superior, tambem em termos de NOM.
546 $a English
590 $a School code: 7026
650 4 $a Water quality. $3 556913
650 4 $a Membranes. $3 1531702
650 4 $a Neurotoxicity. $3 3815593
650 4 $a Electrolytes. $3 656992
650 4 $a Toxicity. $3 3564836
650 4 $a Water supply. $3 736103
650 4 $a Water treatment. $3 3683746
650 4 $a Health care. $3 2213177
650 4 $a Carbon. $3 604057
650 4 $a Amino acids. $3 558768
650 4 $a Molecular weight. $3 3683783
650 4 $a Drinking water. $3 605014
650 4 $a Chemicals. $3 1637953
650 4 $a Cyanobacteria. $3 860872
650 4 $a Sedimentation & deposition. $3 3566241
650 4 $a Chlorophyll. $3 1004345
650 4 $a Metabolites. $3 683644
650 4 $a Toxins. $3 789124
650 4 $a Nitrogen. $3 1314426
650 4 $a Microbiology. $3 536250
650 4 $a Sedimentary geology. $3 3173828
650 4 $a Toxicology. $3 556884
650 4 $a Water resources management. $3 794747
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710 2 $a Universidade do Algarve (Portugal). $e degree granting institution. $3 3815592
720 1 $a Rosa, Maria Joao Filipe $e degree supervisor.
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791 $a Ph.D.
792 $a 2005
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