Effect of fibrous filter properties on the oil-in-water-emulsion separation and filtration performance

Bansal, Swarna; Arnim, Volkmar von; Stegmaier, Thomas; Planck, H.

doi:10.1016/j.jhazmat.2011.01.134

Cited by 108 publications

(76 citation statements)

References 18 publications

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“…Surface energy and its dispersion and polar composition play important role for fibers as sorbent to absorboil from water surface (Bansal et al, 2011). At a low surface energy and non-polar surface where affinities between oil molecules and fiber surface are much higher than that between water molecules and fiber surface, oils are easily absorbed into porous within fibers by capillary force, while water is repelled outside fiber assembly due to the big contact angle and high energy barrier.…”

Section: Surface Energymentioning

confidence: 99%

Oil spill cleanup by structured natural sorbents made from cattail fibers

Dong

Wang

2015

Industrial Crops and Products

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Section: Surface Energymentioning

confidence: 99%

Oil spill cleanup by structured natural sorbents made from cattail fibers

Dong

Wang

2015

Industrial Crops and Products

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“…For decades, the significance of fiber wettability on coalescence efficiency has been investigated [9,10]. The overall view is that wettability is one of the most important or crucial surface properties of filter media, which greatly influences the coalescence outcome as a consequence of attachment and detachment phenomena of droplets in the porous bed [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Prediction of oily water separation efficiency by fiber beds using a new filter media property

Sokolović

Hadnadjev-Kostic

Kiralj

et al. 2018

Hem Ind

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Bed coalescers are compact, easy to install, automate, and maintain with the ability to achieve high separation efficiencies. They have been increasingly applied in the industry even though their design often requires pilot plant experiments. In this paper, a new wetting property of polymer fibers regarding polar mineral oils was established. This property can be important for selection of filter media for liquid-liquid separation in many industrial applications. Medical oil was selected as the new reference liquid that does not wet the investigated polymers. The lipophilic/lyophobic ratio (LLR) reached values ranging from 3.28 to 18.81 and increased with the increase of the mineral oil polarity measured by the oil neutralization number. The LLR values were in an excellent agreement with the results obtained from the separation efficiency of a steady-state bed coalescer. Thus, simple, fast and inexpensive experiments can replace pilot plant or at least laboratory testing aiming at selecting a polymer for oil separation from wastewater.

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“…While oil-solid interactions in micellar solutions are well-documented [7,[10][11][12][13][14], such knowledge has yet to be applied to the design of meshes for separation of surfactantstabilized oil-water emulsions [6,9,[15][16][17]. Therefore, while previous work has been done on the effect of pore size on pressure drop and separation [4,18], the focus of the present investigation is to understand this surfactant-induced anti-wetting mechanism, which is referred to here as detergency-the process whereby soils, liquid or solid, are removed from a substrate material [10]-and to see its implications for oil separation from surfactant stabilized emulsions by studying droplet-mesh interactions at the single droplet level.…”

Section: Introductionmentioning

confidence: 99%

Detergency and Its Implications for Oil Emulsion Sieving and Separation

et al. 2017

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Separating petroleum hydrocarbons from water is an important problem to address in order to mitigate the disastrous effects of hydrocarbons on aquatic ecosystems. A rational approach to address the problem of marine oil water separation is to disperse the oil with the aid of surfactants in order to minimize the formation of large slicks at the water surface and to maximize the oil-water interfacial area, which governs the biodegradation rate. Here we investigate the fundamental wetting and transport behavior of such surfactant-stabilized droplets and the flow conditions necessary to perform sieving and separation of these stabilized emulsions. We show that, for water soluble surfactants, such droplets are completely repelled by a range of materials (intrinsically underwater superoleophobic) due to the detergency effect; therefore, there is no need for surface micro/nanotexturing or chemical treatment to repel the oil and prevent fouling of the filter. We then simulate and experimentally investigate the effect of emulsion flow rate on the transport and impact behavior of such droplets on rigid meshes to identify the minimum pore opening ( w ) necessary to filter a droplet with a given diameter ( d ) in order to minimize the pressure drop across the mesh-and therefore maximize the filtering efficiency, which is strongly dependent on w . We define a range of flow conditions and droplet sizes where minimum droplet deformation is to be expected and therefore find that the condition of w d ≈ is sufficient for efficient separation. With this new understanding, we demonstrate the use of a commercially available filter-without any additional surface engineering or functionalization-to separate oil droplets ( 100 d < µm) from a surfactant stabilized emulsion with a flux of ~11,000 L m -2 hr -1 bar -1 . We believe these findings can inform the design of future oil separation materials.

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Effect of fibrous filter properties on the oil-in-water-emulsion separation and filtration performance

Cited by 108 publications

References 18 publications

Oil spill cleanup by structured natural sorbents made from cattail fibers

Oil spill cleanup by structured natural sorbents made from cattail fibers

Prediction of oily water separation efficiency by fiber beds using a new filter media property

Detergency and Its Implications for Oil Emulsion Sieving and Separation

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