Effects of ozonation on the permeate flux of nanocrystalline ceramic membranes

Karnik, Bhavana S.; Davies, Simon H.; Chen, Kuan C.; Jaglowski, David R.; Baumann, Melissa J.; Masten, Susan J.

doi:10.1016/j.watres.2004.11.017

Cited by 130 publications

(59 citation statements)

References 20 publications

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“…When ozonation is used in combination with membrane filtration, as was accomplished in this hybrid system, fouling can be controlled (Karnik et al, 2005b) and the formation of disinfection by-products after chlorination can be reduced (Karnik et al, 2005a). In very soft waters, the combined use of ozonation and ceramic membrane may lead to significant decreases in BrO 3 -levels in the product water; however, in most natural waters, the Ca 2 + levels would be high enough such that the rejection of both BrO 3 -and Br -by the membrane would be extremely small.…”

Section: Discussionmentioning

confidence: 99%

Rejection of Bromide and Bromate Ions by a Ceramic Membrane

Moslemi

Davies

Masten

2012

Environmental Engineering Science

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Effects of pH and the addition of calcium chloride (CaCl 2 ) on bromate (BrO 3 -) and bromide (Br -) rejection by a ceramic membrane were investigated. Rejection of both ions increased with pH. At pH 8, the rejection of BrO 3 -and Br -was 68% and 63%, respectively. Donnan exclusion appears to play an important role in determining rejection of BrO 3 -and Br -. In the presence of CaCl 2 , rejection of BrO 3 -and Br -ions was greatly reduced, confirming the importance of electrostatic interactions in determining rejection of BrO 3 -and Br -. The effect of Ca 2 + is so pronounced that in most natural waters, rejection of both BrO 3 -and Br -by the membrane would be extremely small.

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Section: Discussionmentioning

confidence: 99%

Rejection of Bromide and Bromate Ions by a Ceramic Membrane

Moslemi

Davies

Masten

2012

Environmental Engineering Science

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“…This result was indicative only as the dissolved ozone concentration in DI water would change during sampling and analysis due to the short half-life time (the order of 500 s) of ozone [57,58]. After each experiment, the ceramic membranes were cleaned with NaOH and HNO 3 solutions following the procedures used by Karnik et al [12] prior to starting the experiment again. After cleaning, the permeate flux of DI water for each membrane was measured to ensure that the initial flux was the same in all experiments.…”

Section: Effect Of Ozone Injection On Permeate Fluxmentioning

confidence: 99%

“…Ceramic membranes such as titania, zirconia, γ-alumina, and silica/γ-alumina have been studied for separation of ions from aqueous solutions by nanofiltration [7][8][9][10][11]. Titania membranes have also been studied for water treatment by several research groups [12][13][14][15]. Recently, a commercial ceramic membrane module from NGK Insulators, Ltd. (Japan) was trialled in water microfiltration [16].…”

Section: Introductionmentioning

confidence: 99%

“…Ozonation has been successfully used at full scale and can be combined with other advanced oxidation processes such as photocatalysis for the degradation of organic substances [19][20][21]. Several studies have investigated the combination of ozonation and membrane processes using polymeric membranes [12], but the poor stability of polymeric membranes when exposed to ozone [6] has made this process unviable. To realise the benefit of combined oxidation processes incorporating membranes and to overcome issues of membrane degradation, some researchers have investigated the combination of ozonation and ceramic membranes for water or wastewater treatment [12,13,16].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have investigated the combination of ozonation and membrane processes using polymeric membranes [12], but the poor stability of polymeric membranes when exposed to ozone [6] has made this process unviable. To realise the benefit of combined oxidation processes incorporating membranes and to overcome issues of membrane degradation, some researchers have investigated the combination of ozonation and ceramic membranes for water or wastewater treatment [12,13,16]. Their results have demonstrated a high permeate flux without membrane damage, but further investigation of the improvement in quality to real waters coupled with the use of membranes designed to have catalytically active surfaces is still in need to demonstrate this promising process, as undertaken in this study.…”

Section: Introductionmentioning

confidence: 99%

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Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes

Zhu

Kennedy

et al. 2011

Journal of Membrane Science

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Water recycling via treatment from industrial and/or municipal waste sources is one of the key strategies for resolving water shortages worldwide. Polymer membranes are effective at improving the water quality essential for recycling, but depend on regular cleaning and replacement. Pure ceramic membranes can reduce the cleaning need and last significantly longer in the same applications whilst possessing the possibility of operating in more aggressive environments not suitable for polymers. In the current work, filtration using a tubular ceramic membrane (α-Al 2 O 3 or TiO 2 ) was combined with ozonation to remove organic compounds present in a secondary effluent to enhance key quality features of the water (colour and total organic carbon, TOC) for its potential reuse.'Bare' commercial α-Al 2 O 3 filters (pore size ~0.58 µm) were tested as a microfiltration membrane and compared with the more advanced catalytically active TiO 2 layer that was formed by the sol-gel method. The presence of anatase with a 4 nm pore size at the membrane surface was confirmed by Xray diffraction (XRD) and N 2 adsorption. Filtration of the effluent over a 2 hour period led to a reduction in flux to 45% and 60% of the initial values for the α-alumina and TiO 2 membrane, respectively. However, a brief dose (2 mins) of ozone at the start of the run resulted in reductions to only 70% of the initial flux for both membranes. It is likely that the oxide's functional property Interestingly, the porous structure therefore acted in a synergistic, dual function mode to physically separate the particulates whilst also catalytically breaking down organic matter. The system also greatly improved the efficiency of membrane filtration for the reduction of colour, A 254 (organics absorption at the wavelength of 254 nm) and TOC. The best performance came from combined ozonation (2 min ozonation time with an estimated applied ozone dose of 8 mg L -1 ) with the TiO 2 membrane, which was able to reduce colour by 88%, A 254 by 75% and TOC by 43%. It is clearly evident that a synergistic effect occurs with the process combination of ozonation and ceramic membrane filtration demonstrating the practical benefit of combining ceramic membrane filtration with conventional water ozonation.

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