Modelação da perda de carga na filtração direta ascendente em meio granular de areia grossa e pedregulho

Botari, Alexandre; Bernardo, Luiz Di

doi:10.1590/s1413-41522009000200012

Cited by 3 publications

(1 citation statement)

References 10 publications

(2 reference statements)

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“…The greater head loss in depth presented in SF2 (5.5 m 3 /m 2 Ád) to SF1 (11 m 3 /m 2 Ád), according to the literature, is not a common occurrence in SFs considering the difference among filtration rates, although slow filtration rates have low flow velocity and higher activity of transport mechanisms, which favor biofilm formation in a long term (Brito et al, 2005), in this case, causing in-depth clogging. Also, higher filtration rates promote head loss increase due to higher flow velocity (Botari & di Bernardo, 2009). Although for more conclusions, it would be necessary additional analysis of the filter media, like organic matter and microbiological activity.…”

Section: Phase 2: Water Qualitymentioning

confidence: 99%

Pre‐filtration followed by slow double‐layered filtration: Media clogging effects on hydraulic aspects and water quality

Lunardi

Martins

Pizzolatti

et al. 2022

Water Environment Research

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This study evaluated clogging effects on head loss and water quality in sand prefiltration columns, followed by innovative double-layered slow-filter filtration technology using anthracite coal and sand. The study was divided into two phases. Phase 1 (filtration rate 11 m 3 /m 2 Ád) had a layout of a pre-filter (PF) system followed by a slow filter (SF). In Phase 2 (filtration rates of 5.5 and 11 m 3 /m 2 Ád), two PF systems (PF1 and PF2) followed by SFs (SF1 and SF2) were monitored, be differed only by filtration rate. Phase 1 presents a mean turbidity removal of 45.6% in PF and 23.9% in SF. PF presented a lower head loss in the superficial layers of the filter media, whereas SF presented a more important contribution in the deeper layers of the bed. In Phase 2, the mean results obtained for turbidity removal in PF1 and SF1 were 84.7% and 22.4%, in that order. PF2 and SF2 promoted mean reductions of 84.5% and 22.0%, respectively. Greater clogging is observed in the PF's surface layers, whereas the SFs dissipate greater clogging with depth. Filtration rates and water quality were similar in filter media of different compositions. Practitioner Points• Double-layer filters show better use of the porous media in depth.• Different materials produce different forms of clogging. • Higher filtration rates increase the number of pre-filter and slow filter runs.

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Section: Phase 2: Water Qualitymentioning

confidence: 99%

Pre‐filtration followed by slow double‐layered filtration: Media clogging effects on hydraulic aspects and water quality

Lunardi

Martins

Pizzolatti

et al. 2022

Water Environment Research

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Análise e modelação matemática da interação entre partículas na filtração direta utilizando a teoria coloidal

Botari

Bernardo

Dantas

2012

Eng. Sanit. Ambient.

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ResumoEste trabalho utilizou a teoria coloidal para descrever o comportamento físico pelo balanço de forças e balanço de energia de complexos coloidais na água bruta e daqueles formados durante a filtração direta em escoamento ascendente. Nele são descritos os perfis de energia de interação entre as superfícies dos colóides para três geometrias: esférica, plana e cilíndrica; e quatro arranjos de interação entre as superfícies: dois cilindros, dois planos, duas esferas e uma esfera e um plano. Duas situações foram analisadas, antes e após a desestabilização eletrostática pela ação de sulfato de alumínio em águas de estudo contendo caulinita, utilizando-se a modelação e análise pela teoria DLVO (das iniciais de Derjarguin-Landau-Verwey-Overbeek) modificada, ou XDLVO, que inclui à abordagem tradicional das forças da dupla camada elétrica (DCE), forças de atração de superfície ou London-van der Waals (LvdW), forças estéricas, força hidrofóbica e forças de outras origens no cálculo do balanço de forças, a saber: repulsão molecular, denominada repulsão de Born, e a força oriunda das funções químicas Ácido e Base (AB) de Lewis.Palavras-chave: modelação matemática; filtração direta ascendente; teoria coloidal; teoria XDLVO. AbstractThis work used the colloidal theory to describe forces and energy interactions of colloidal complexes in the water and those formed during filtration run in direct filtration. Many interactions of particle energy profiles between colloidal surfaces for three geometries are presented here in: spherical, plate and cylindrical; and four surface interactions arrangements: two cylinders, two spheres, two plates and a sphere and a plate. Two different situations were analyzed, before and after electrostatic destabilization by action of the alum sulfate as coagulant in water studies samples prepared with kaolin. In the case were used mathematical modeling by extended DLVO theory (from the names: Derjarguin-Landau-Verwey-Overbeek) or XDLVO, which include traditional approach of the electric double layer (EDL), surfaces attraction forces or London-van der Waals (LvdW), esteric forces and hydrophobic forces, additionally considering another forces in colloidal system, like molecular repulsion or Born Repulsion and Acid-Base (AB) chemical function forces from Lewis.

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Physico‐Chemical Processes

Afzal¹,

Pourrezaei²,

Ding³

et al. 2009

Water Environment Research

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Modelação da perda de carga na filtração direta ascendente em meio granular de areia grossa e pedregulho

Cited by 3 publications

References 10 publications

Pre‐filtration followed by slow double‐layered filtration: Media clogging effects on hydraulic aspects and water quality

Pre‐filtration followed by slow double‐layered filtration: Media clogging effects on hydraulic aspects and water quality

Análise e modelação matemática da interação entre partículas na filtração direta utilizando a teoria coloidal

Physico‐Chemical Processes

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