Inorganic Membranes for the Filtration of Water, Wastewater Treatment and Process Industry Filtration Applications

Bhave, Ramesh R.; Guibaud, J.; Rumeau, R.

doi:10.1007/978-94-011-6547-1_9

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The role of the intermediate layer(s) with medium pore size is to prepare a relatively smooth surface for applying the filtering layer and adjusting the pressure gradient through the membrane system. The top filtration layer has the smallest pore size [7,45]. Interestingly, as seen in Figure 6a, the preferential build-up of the loosely packed nanostructured agglomerates inside the pores of the stainless-steel substrate has created a natural intermediate layer preventing the membrane structure from collapsing into the large pores of the substrate.…”

Section: Microstructural Analysismentioning

confidence: 99%

TiO2 Photocatalytic Ultrafiltration Membrane Developed with Suspension Plasma Spray Process

2022

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The suspension plasma spray process was used to fabricate photocatalytic ultrafiltration membranes for potential water and wastewater treatment applications. An aqueous suspension of 30 wt.% titanium dioxide with an average individual particle size of around 30 nm was used as feedstock material. The spray parameters, such as suspension solid content, suspension feed rate, and spray distance, were optimized using an Ar/H2 plasma to retain a fraction of unmelted feedstock nanoparticles as the source of fine pores in the membrane microstructure. The microstructure, porosity, phase composition, and pure water permeability of the membranes were characterized comprehensively. The average pore size of the membrane was around 40 nm, which was very close to the particle size of the pristine titanium dioxide powder. The membranes demonstrated a high water permeability between 2000 and 7200 L m−2 h−1 bar−1, which was inversely proportional to the thickness. They also exhibited significant photocatalytic activity under visible light.

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Section: Microstructural Analysismentioning

confidence: 99%

TiO2 Photocatalytic Ultrafiltration Membrane Developed with Suspension Plasma Spray Process

2022

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“…Microporous ceramic membranes have proven successful in removing or recovering small amounts of oil or grease from water, concentrating oil up to 25% in the retentate with >99% oil rejection Bhave et al, 1991;Chen et al, 1991). Separation of oil from oil-water emulsions by crossflow filtration was also documented (Hlavacek, 1995;Lee et al, 1984;Lipp et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Two-phase bioconversion product recovery by microfiltration I. Steady state studies

Conrad

Lee

1998

Biotechnol. Bioeng.

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Recovery of an aqueous bioconversion product from complex, two‐phase Pseudomonas putida broths containing 20% (v/v) soybean oil presents a significant challenge for downstream processing. Although not used before in multiple‐phase separation for complex biotech products, crossflow filtration employing ceramic filters is one of the most attractive options which allow the design of integrated, continuous bioconversion processes. As a first attempt, we studied multichannel, monolithic ceramic membranes of different nominal pore sizes and lumen diameters under steady‐state conditions. The best performance was obtained with 0.2‐μm‐pore/3‐mm‐lumen membrane, which completely rejected both cells and oil droplets from the permeate, creating a clear aqueous product stream. Although the same separation was achieved, the 50K molecular weight cut‐off (MWCO) ultrafilter showed greater irreversible but similar reversible resistance, in addition to an order‐of‐magnitude higher membrane resistance. Larger nominal pore microfilters, such as 0.45 and 1.0 μm, experienced both cell and oil leakage even at low transmembrane pressure (10 psig). Attributed to greater shear at the same recirculation rate, smaller lumen filters did provide greater permeate flux. However, for practical purposes, the 0.2‐μm‐pore/4‐mm‐lumen ceramic membrane was chosen for further evaluation. Transmembrane pressures up to 50 psig provided only marginal gains in filtration performance, whereas increasing shear rate resulted in linear increases in steady‐state flux, presumably due to formation of shear‐sensitive, complex gel/oil/cell layer near the membrane surface. A nominal shear rate of 9200 s−1 and 20 psig transmembrane pressure were chosen as optimal operating conditions. Additional studies in a clean system revealed that as low as 5% (v/v) soybean oil in deionized (DI) water resulted in an order‐of‐magnitude decline in steady‐state permeate flux. Breakthrough of oil droplets occurred at 35 psig transmembrane pressure. The severe fouling and breakthrough phenomena disappeared in the presence of washed cells for transmembrane pressure up to 43 psig, implying an oil/cell layer coating the membrane surface, thus preventing oil penetration. Serious membrane fouling was also experienced in microfiltration of oil‐free, cell‐free supernatant and oil‐free whole broth. Consequently, soluble proteins/surfactants were suspected to be the major membrane foulants. Interestingly, soybean oil up to 30% (v/v) enhanced the flux, presumably through complicated interactions with the major foulants. Regeneration of membrane was best achieved with protease and hot caustic/bleach treatments, supporting the hypothesized fouling mechanisms mentioned above. This work provides process and system information for batch microfiltration runs in the future, to be reported elsewhere as Part II of this work. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 57: 631–641, 1998

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Sustainable Wastewater Treatment Methods for Textile Industry

Periyasamy

Ramamoorthy

Rwawiire

et al. 2018

Textile Science and Clothing Technology

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Inorganic Membranes for the Filtration of Water, Wastewater Treatment and Process Industry Filtration Applications

Cited by 5 publications

References 3 publications

TiO2 Photocatalytic Ultrafiltration Membrane Developed with Suspension Plasma Spray Process

TiO2 Photocatalytic Ultrafiltration Membrane Developed with Suspension Plasma Spray Process

Two-phase bioconversion product recovery by microfiltration I. Steady state studies

Sustainable Wastewater Treatment Methods for Textile Industry

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