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Komolikov, Yu. I.; Blaginina, L. A.

doi:10.1023/a:1020523301886

Cited by 25 publications

(8 citation statements)

References 3 publications

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“…10,14,15 Research to date has documented manufacturing practices vary widely among and within factories. 10,11 As manufacturing parameters, including type and size of clay, 16 burnout material, 17 firing temperature, 18 geometry, 13 and biocidal additives, 19 influence filter performance, an extensive body of research on ceramic filter efficacy has been and is currently conducted in laboratory settings investigating these variables. Ceramic filters are a widely researched HWTS intervention; 12 filters have been published within ES&T alone.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Currently, ceramic filters are manufactured by more than 35 decentralized factories worldwide. ,, Research to date has documented manufacturing practices vary widely among and within factories. , As manufacturing parameters, including type and size of clay, burnout material, firing temperature, geometry, and biocidal additives, influence filter performance, an extensive body of research on ceramic filter efficacy has been and is currently conducted in laboratory settings investigating these variables. Ceramic filters are a widely researched HWTS intervention; 12 papers containing field, laboratory, or modeling research on ceramic pot water filters have been published within ES&T alone. ,,,− In addition, to be acceptable to users, filters need to have a sufficient flow rate. ,,,− Therefore, hydraulic models have been developed to understand factors controlling water discharge (flow and volume).…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Hydraulic Performance in Disks and Full-Scale Ceramic Water Filters

Heylen

Annan

Monahan

et al. 2021

Environ. Sci. Technol.

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Ceramic filters for household water treatment can improve water quality and reduce diarrheal disease. Hydraulic performance is critical for quality control and user acceptability, and hydraulic models have previously been developed and tested with experimental full-scale filters. As filters are cumbersome, there is interest in using disks instead of filters in laboratory efficacy studies. To assess the validity of disk use, we collected experimental volume from three sets of full-scale frustum-shaped filters and matching disks with different burn-out material sieve sizes and firing temperatures. We compared the experimental and fitted data by calibrating hydraulic conductivities from filters and disks. Hydraulic conductivities increased with larger burn-out material and higher firing temperatures but were comparable between filters and disks (2.00−6.15 × 10 −7 m•s −1 and 2.69−6.32 × 10 −7 m•s −1 , respectively). We found that previously described hydraulic models successfully predicted cumulative volumes for filters and disks with rRMSE ranging from 2.1 to 9.6% (filters) and 3.4 to 4.7% (disks). The error increased slightly (rRMSE: 5.0−15%) when predicting hydraulic parameters for filters from the hydraulic conductivity of disks. Our results validate a method to predict full-scale filter hydraulic performance from hydraulic conductivity of disks and can be used to simplify and increase testing capacity, resulting in higher quality, more acceptable filters that improve household drinking water quality.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Hydraulic Performance in Disks and Full-Scale Ceramic Water Filters

Heylen

Annan

Monahan

et al. 2021

Environ. Sci. Technol.

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“…Conventional microfiltration membranes are mostly prepared using polymers, but they are costly and have poor durability [7]. In recent years, microporous ceramics have been widely used in the preparation of microfiltration or ultrafiltration materials because of they have the advantages of heat resistance, chemical resistance, mechanical resistance, controllable microstructure, and low environmental pollution [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Study on Permeability Stability of Sand-Based Microporous Ceramic Filter Membrane

Zhou

Zhang

et al. 2019

Materials

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The instability of diafiltration is a widespread problem in the practical application of microporous ceramic filtration membranes. In this paper, a series of microporous ceramic filter membranes were prepared using inexpensive standard sand and river sand as matrix materials. Semi-empirical formula for the effective permeability radius of ceramic membranes with respect to time was established from analysis of the response mechanism between water flow and material properties. Finally, on the basis of theoretical analysis, some measures were proposed to improve permeate flux. The experimental results showed that during the initial stage of filtration, the microporous ceramic filter membrane had a large change in permeate flux, and during the late stage of filtration, permeate flux tended to be stable. Over time, open porosity and closed porosity changed the actual seepage area of the ceramic membrane, and this affected the stability of permeate flux and final stable permeate flux. The roughness of the inner wall of microporous ceramic pores affected the hydraulic loss coefficient, and this controlled the outflow process. Trace elements that were rich in sand produced a large amount of glass phase after sintering. The glass phase was rich in polar groups and formed a temporary hydrogen bond with the small flow of water molecules. It led to an increase in viscous resistance effect of the side wall along the water flow and the extent of the permeate flux of the ceramic membrane changed with time.

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“…Polymeric membrane materials have been investigated intensively for their antifouling performances during oily wastewater treatment, and the influences of material properties have been widely reported. − In contrast, roles of ceramic membrane materials in their antifouling performances have not been systematically studied. , Knowledge on relationships between surface properties of filtration-layer metal oxide and ceramic membrane fouling tendency will be critical to select appropriate materials for fabrication/modification of ceramic membrane to treat successfully O/W emulsion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Properties of Filtration-Layer Metal Oxide on Ceramic Membrane Fouling during Ultrafiltration of Oil/Water Emulsion

Zou

Gutierrez

et al. 2016

Environ. Sci. Technol.

137

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In this work, ceramic ultrafiltration membranes deposited with different metal oxides (i.e., TiO 2 , Fe 2 O 3 , MnO 2 , CuO, and CeO 2 ) of around 10 nm in thickness and similar roughness were tested for O/W emulsion treatment. A distinct membrane fouling tendency was observed, which closely correlated to the properties of the filtration-layer metal oxides (i.e., surface hydroxyl groups, hydrophilicity, surface charge, and adhesion energy for oil droplets). Consistent with the distinct bond strength of the surface hydroxyl groups, hydrophilicity of these common metal oxides is quite different. The differences in hydrophilicity consequently lead to different adhesion of these metal oxides toward oil droplets, consistent with the irreversible membrane fouling tendency. In addition, the surface charge of the metal oxide opposite to that of emulsion can help to alleviate irreversible membrane fouling in ultrafiltration. Highly hydrophilic Fe 2 O 3 with the lowest fouling tendency could be a potential filtration-layer material for the fabrication/modification of ceramic membranes for O/W emulsion treatment. To the best of our knowledge, this is the first study clearly showing the correlations between surface properties of filtration-layer metal oxides and ceramic membrane fouling tendency by O/W emulsion.

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Cited by 25 publications

References 3 publications

Modeling of Hydraulic Performance in Disks and Full-Scale Ceramic Water Filters

Modeling of Hydraulic Performance in Disks and Full-Scale Ceramic Water Filters

Study on Permeability Stability of Sand-Based Microporous Ceramic Filter Membrane

Influence of Surface Properties of Filtration-Layer Metal Oxide on Ceramic Membrane Fouling during Ultrafiltration of Oil/Water Emulsion

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