Designing high-caliber nonwoven filter mats for coalescence filtration of oil/water emulsions

Hu, Dan; Li, Xiaoyü; Li, Lei; Yang, Chuanfang

doi:10.1016/j.seppur.2015.05.014

Cited by 51 publications

(21 citation statements)

References 38 publications

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“…It can be seen that the medium has many pores formed by the randomly distributed fibers. Such a morphology is very typical of filter media made by a wet‐laying process . Some of these pores are interconnected across the thickness of the media for fluid flow due to the discrete nature of the fibers used to form the media with irregular pores.…”

Section: Resultsmentioning

confidence: 99%

“…The T‐CF‐M was made with a total mass of 15 g of TiO 2 ‐CF using a conventional wet‐laying process (Fig. (a)) . It involves three steps: TiO 2 ‐CF dispersing, dewatering and drying.…”

Section: Methodsmentioning

confidence: 99%

“…Such a morphology is very typical of filter media made by a wet-laying process. 14,15 Some of these pores are interconnected across the thickness of the media for fluid flow due to the discrete nature of the fibers used to form the media with irregular pores. When zoomed in (inset of Fig.…”

Section: Materials Characterizationmentioning

confidence: 99%

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Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO₂ decorated cellulose fibers

Zhang

et al. 2017

J of Chemical Tech & Biotech

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Background TiO2‐cellulose composite fibers are a new type of bio‐sorbent combining natural polymers and nanoparticles. However, their batch adsorption capacity is limited. Here mesoporous TiO2‐cellulose composite fibers were synthesized and a filter medium was subsequently made from them to remove lead continuously by dynamic adsorption. Results TiO2‐cellulose composite fibers with rough hierarchical surface structure were fabricated by in situ growing mesoporous TiO2 on cellulose fibers via microwave‐facilitated hydrolysis. The composite fibers were then wet‐laid into a filter medium to remove low‐concentration Pb2+ in water through adsorptive filtration. The breakthrough curves were found to be better predicted by the dose–response model originally established for a fixed column bed. With a volume of merely 2.07 cm3, the medium can treat 150.0 L of water containing 50 ppb lead to the drinking water standard. The filter performance was improved by incorporation of small non‐functional glass fibers to minimize the pore size and its distribution. The medium was also Pb2+ selective over co‐existing cations, and could be easily regenerated and reused without reduction in performance. Conclusion The filter medium fabricated by nano‐TiO2 decorated cellulose fibers showed enhanced adsorption capacity for lead through adsorptive filtration. Such filter beds have high potential for toxic micro‐pollutant removal from drinking water. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO₂ decorated cellulose fibers

Zhang

et al. 2017

J of Chemical Tech & Biotech

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“…Small droplets entering the bed are coalescing on the capillary-conducted surface, while large globules are detached from the surface and settled after leaving the bed [1,3,[6][7][8]. Coalescing filtration is a complex phenomenon due to involving a bed of high porosity, up to 98 %, and two immiscible liquids [9][10][11][12][13][14][15] leading to a large number of variables affecting occurrences in this complex system. For a long time, the polypropylene fibers have been used for separation of oil droplets from water.…”

Section: Introductionmentioning

confidence: 99%

Application of waste polypropylene bags as filter media in coalescers for oily water treatment

Sokolović¹,

Kiralj

Jokic

2019

Hem Ind

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The polypropylene fibers have been used in bed coalescers for separation of micro-sized oil droplets from water for a long time. Possibilities of applying different forms of polypropylene as filter beds are still being in the focus of many researches. The possibility of applying waste polypropylene bags used for packing vegetables (PPDJ) was investigated in this paper. The results are compared with results obtained by applying waste polypropylene fibers from carpet production (PP). It is well known that there are difficulties to separate the oils of low viscosity by polymer fiber beds. Due to the above mentioned, the presented research refers to separation of low viscosity mineral oil from water. The obtained experimental results confirm that the material PPDJ could be efficiently used as a bed material for coalescers. The critical velocity of 50 m h -1 could be reached at using both polypropylene forms that is from bags PPDJ and from the carpet industry PP, when the adequate bulk density of materials is used.

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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]. Therefore, better understanding of attachment mechanisms affecting the droplet substantially helps in the selection of more efficient filter media for a wide range of industrial applications.…”

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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Designing high-caliber nonwoven filter mats for coalescence filtration of oil/water emulsions

Cited by 51 publications

References 38 publications

Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO₂ decorated cellulose fibers

Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO₂ decorated cellulose fibers

Application of waste polypropylene bags as filter media in coalescers for oily water treatment

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

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Designing high-caliber nonwoven filter mats for coalescence filtration of oil/water emulsions

Cited by 51 publications

References 38 publications

Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO2 decorated cellulose fibers

Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO2 decorated cellulose fibers

Application of waste polypropylene bags as filter media in coalescers for oily water treatment

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

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Product

Resources

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Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO₂ decorated cellulose fibers

Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO₂ decorated cellulose fibers