influência das características das substâncias húmicas na eficiência da coagulação com sulfato de alumínio the influence of humic substances characteristics on the coagulation efficiency using aluminum sulfate

Clicks: 351
ID: 134164
2005
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Abstract
Neste trabalho foi estudada a influência das características das substâncias húmicas (SH), em especial a massa molar das moléculas, na eficiência da coagulação com o uso do sulfato de alumínio. Utilizando-se de água proveniente de poço profundo, foram preparadas quatro águas de estudo, todas com cor verdadeira de aproximadamente 100 uH. As SH foram extraídas de turfa e fracionadas em massas molares: i) SH filtradas em membranas de 0,45 µm; ii) SH filtradas em membranas de 0,45 µm e maiores que 100 kDa, iii) SH com moléculas entre 30 e 100 kDa; iv) SH com moléculas menores do que 30 kDa. Verificou-se que quanto maior a massa molar das SH maior foi a eficiência de remoção da cor aparente, com as menores dosagens de coagulante.O pH de coagulação ótimo, esteve entre 6,0 e 7,0, para todas as águas de estudo. Os estudos da porcentagem de ácido húmico (AH) e ácido fúlvico (AF) presentes em cada fração de diferente massa molar mostraram que quanto maior foi à porcentagem de AF presente, maior foi à dosagem de coagulante exigida para se obter os melhores resultados de remoção da cor aparente.
The influence of the molecular weight of soil humic substances on the coagulation efficiency with aluminum sulfate was studied in this work. Four types of water were studied, with the same true color of approximately 100 HU, but prepared with different fractions of molecular weights: Water Type 1 (humic substances filtered in membrane of 0,45 µm); Water Type 2 (humic substances filtered in membrane of 0,45 µm and with molecular weight > 100 KDa); Water Type 3 (humic substances with molecular weight between 100 and 30 KDa); Water Type 4 (humic substances with molecular weight < 30 KDa). It was conclude that the higher the molecular weight of the molecules, the lower the coagulant dosages required for efficient coagulation, at the coagulation pH range 6 - 7. The types of water prepared with the fractions of humic substances containing higher concentrations of fulvic acid required higher doses of coagulant to achieve the same efficiency.
Reference Key
campos2005engenhariainfluncia Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Sandro Xavier Campos;Luiz Di Bernardo;Eny M. Vieira
Journal ophthalmology and therapy
Year 2005
DOI
10.1590/S1413-41522005000300003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-41522005000300003
Keywords
humic acid molecular weight fulvic acid humic substances coagulation with aluminum sulfateenvironmental technology

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