Toward an Optimization of the Backwashing Process in the Flexible Fiber Filter

Lee, J. J.; Cha, J. H.; Ben-Aim, R. I.; Han, Ki Baek; Kim, C. W.

doi:10.1080/01496390801973854

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Several wastewater treatment plants (more than 2 millions m 3 /day) in Korea apply fibre filters for obtaining treated water of high quality [3]. Previous studies have researched the optimal coagulant dosage for operation at high filtration velocities for water treatment [4], the effect of different operational parameters (packing density and filtration velocity) on the required height of fibre filter and the characterizations of the filtrate [5], evaluating the possibility of applying the fibre filter as an alternative to the process of flocculation-sedimentation for water treatment [6], optimisation of the backwashing process in fibre filter for water treatment [7], algae removal [8]. A study of a fibre filter treating seawater operated over several months evaluated the optimal operating conditions and the combination of coagulant and reagents [9].…”

Section: Introductionmentioning

confidence: 99%

Novel pre-treatment method for seawater reverse osmosis: Fibre media filtration

et al. 2010

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A high rate fibre filter was used as a pre-treatment to seawater reverse osmosis (SWRO) to reduce membrane fouling. Seawater was drawn from Chowder Bay where the Sydney Institute of Marine Science, Australia is located. A lab-scale fibre filter with a height of 1000 mm and a diameter of 30 mm was used in conjunction with inline coagulation. The effect of operating the fibre filter with different packing densities (105, 115 kg/m 3) and filtration velocities (40, 60 m/h) was investigated in terms of silt density index (SDI 10), modified fouling index (MFI), pressure drop (ΔP), turbidity and molecular weight distribution (MWD). The use of in-line coagulation improved the performance of fibre filter as measured by the MFI and SDI. Regardless of filtration velocity and packing density the MFI and SDI 10 values remained low as did the turbidity until the end of the filtration run. The MWD analysis showed the removal efficiencies of organic materials like biopolymers, fulvic acids, low MW acids for even experiments with the highest filtration velocity (60 m/h) and lowest packing density (105 kg/m 3). This pre-treatment has a small foot print as it has the capacity of operating at a very high filtration velocity.

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Section: Introductionmentioning

confidence: 99%

Novel pre-treatment method for seawater reverse osmosis: Fibre media filtration

et al. 2010

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“…A lavagem no filtro de fibras flexíveis é feita utilizando a combinação ar e água. A fim de aperfeiçoar o processo de lavagem, Lee et al (2008b) fizeram um estudo com filtro de fibras de poliamida em escala piloto para o tratamento de água superficial do rio Nak-dong. O leito do filtro possuía uma densidade de fibras de 80 kg.m -3 , equivalente a uma porosidade de 93%.…”

Section: Lavagem Do Filtro De Fibras Flexíveisunclassified

Influência da porosidade do leito e do diâmetro das fibras na eficiência da filtração com filtro de fibras flexíveis aplicado ao tratamento de água

Sá¹

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Palavra-chave: tratamento de água para abastecimento; filtração; filtro de fibras flexíveis; poliamida; fundo de filtro. ABSTRACT de SÁ, A.B.C. (2016) Influence of the porosity and diameter of the fibers in filtration efficiency with flexible fibers filter applied to water treatment. 2016.132p. Dissertation (Master's Degree). Engineering School of São Carlos, University of São Paulo. The flexible fiber filters are direct filtration module, made of microfibers filter media. They are operated with high filtration rates ensuring high solids removal efficiency. This study evaluated the influence of diameters of fibers, porosity and filtration rates in the clarification efficiency of synthetic water. Three filters have been constructed with internal diameter of 28 mm and porosity of 84%, each with a filter medium of 100 cm length and fiber diameter of 0.03, 0.11 and 0.32 mm, and a filter of the same diameter and length, comprises fibers of 0.03 mm and porosity of 93%. The water distribution at the filter inlet was composed by four peripheral holes of 3.5 mm and a central hole of 8 mm (filter bottom Type 1-F Type1). That same input was used for water and air distribution in the wash. In a second step, was evaluated other water distribution in the filter inlet, with only four peripheral holes (filter bottom Type 2-F Type2). In this new filter configuration were evaluated 0.03 mm fiber filters with two porosity values: 84% and 93%. The synthetic water had turbidity of 9.51 ± 0.22 NTU and apparent color of 86.4 ± 4.5 uC. The coagulation was performed in-line with aluminum sulfate at a dosage of 22.5 mg.L-1. In all three filters were evaluated three filtration rates: 60, 80 and 100 m / h and fixed the limits of the filtered water turbidity of 0.5 and 2.0 NTU at the end of the career filter. The water distribution in the filter inlet proved to be extremely important for the proper functioning of the same, because, depending on your configuration, entanglements can occur, compromising the color and turbidity removal efficiency. The bottom filter F Type1 presented a satisfactory quality for the fiber filter diameter 0.11 mm, producing filtered water with turbidity below 2.0 NTU. The filter of 0.03 mm diameter fibers could produce water quality within the limit in some tests, however there was no repeatability due to entanglement occurred in the bed. Other way, the 0.32 mm diameter fiber filter has not reached satisfactory turbidity. The two fibers filters F Type2 and porosity 93% and 84%, respectively, were able to achieve values imposed to the turbidity of the filtered water in all studied rates (60, 80 and 100 m.h-1), except 93% porosity filter witch not reached the minimum turbidity of 0.5 NTU when operated a 100 m.h-1 rate. At the end was estimated the volumes of the filtered water produced within one day (24h) for each filter that has reached the limits of predetermined turbidity. Among the variations tested F Type1 and F Type2 , can be concluded that the daily water volume produced increases with the filtration rate inc...

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