A novel approach to ozone ‐ water mass transfer using hollow ‐ fiber reactors

Shen, Zhe; Semmens, Michael J.; Collins, Anthony

doi:10.1080/09593339009384902

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…where C m1 is the concentration at the gas-membrane interface on the membrane side and S is the solubility constant of the gas in the membrane. Previous studies, e.g., [13,18] on O 3 mass transfer often assumed the concentration of O3 at the gas-membrane is continuous i.e., C g,i = C m1 . In this work, comparison of the concentration profile at the gas-membrane interface for both cases is presented.…”

Section: Membranementioning

confidence: 99%

“…The potential for large-scale operation of O 3 is limited by membrane durability under extreme oxidizing conditions [17]. Therefore, the choice of the membrane material in O 3 applications is critical [18,19]. Chemical-resistant membranes that have been used for ozonation of water consist of ceramic materials [20][21][22][23][24] and fluorinated [13,[25][26][27][28][29] or non-porous silicone based [26,30] polymers.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Ozone Mass-Transfer through Non-Porous Membranes for Water Treatment

Berry

Taylor

King

et al. 2017

Water

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The mass transfer of ozone and oxygen into water through non-porous membranes was studied using computational fluid dynamics (CFD) modelling and fundamental convection-diffusion theory. Ozone is a gaseous oxidant that is widely applied in drinking water treatment. Membrane contactors are an alternative to conventional gas dispersion methods for injection of ozone gas mixtures into water. Few studies have explored computational approaches for membrane based ozone transport. In this investigation, quantitative concentration profiles across a single polydimethylsiloxane (PDMS) capillary membrane tube with internal gas flow and external liquid flow were obtained, including single mass transfer resistances and overall mass transfer coefficients for ozone and oxygen for varying membrane lengths, thicknesses, and laminar flow liquid side velocities. Both the influence of diffusivity and solubility of gases in the membrane were considered with the applied model. Previous studies have neglected the solubility of gases in the membranes in their analysis of ozone and oxygen gas fluxes. This work shows that the solubility has a significant impact of the overall mass transfer coefficients, in particular for oxygen. The main resistance for ozone was found in the liquid side, while for oxygen it was in the membrane. Mass transfer correlations based on heat transfer analogies revealed Sherwood (Sh) correlations for ozone and oxygen with good agreement to literature data, indicating that the applied computational model returns sensible results. The outcome of this study provides an initial basis for computational predictions of ozone and oxygen mass transfer for different membrane materials, flow conditions and reactor designs.

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Section: Membranementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of Ozone Mass-Transfer through Non-Porous Membranes for Water Treatment

Berry

Taylor

King

et al. 2017

Water

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“…In the United States there is an increasing interest in the application of both ozone and membrane filtration for DBP and DBP precursor removal in order to meet the requirements of the Surface Water Treatment Rule (SWTR), the Disinfectant and Disinfectant Byproducts Rule (D/DBPR), and the Long Term 1 Enhanced Surface Water Treatment rule (LT1ESWTR). Several researchers have attempted to combine ozone with polymeric membranes with limited success, in part because the organic membranes, which are commonly used in water and wastewater treatment applications, are prone to destruction by ozone (6)(7)(8)(9). Hashino et al (9) studied the use of ozonation combined with an ozone resistant polyvinylidenefluoride (PVDF) microfiltration membrane.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Catalytic Membranes for the Treatment of Drinking Water Using Combined Ozonation and Ultrafiltration

Karnik

Davies

Baumann

et al. 2005

Environ. Sci. Technol.

144

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The removal of disinfection byproducts and their precursors was investigated using a combined ozonation-ultrafiltration system. A commercial membrane was coated 20 or 40 times with iron oxide nanoparticles (4-6 nm in diameter). With this membrane, the concentration of dissolved organic carbon was reduced by >85% and the concentrations of simulated distribution system total trihalomethanes and simulated distribution system halo acetic acids decreased by up to 90% and 85%, respectively. When the coated membrane was used, the concentrations of aldehydes, ketones, and ketoacids in the permeate were reduced by >50% as compared to that obtained with the uncoated membranes. Hydroxyl or other radicals produced at the iron oxide coated membrane surface as a result of ozone decomposition are believed to have enhanced the degradation of the natural organic matter, thereby reducing the concentration of disinfection byproducts. While increasing the number of times the membrane was coated from 20 to 40 did not significantly reduce the concentrations of most of the parameters measured, it did result in a significant decrease in the concentrations of ozonation byproducts. Increasing the sintering temperature from 500 to 900 degrees C also resulted in an improvement in the removal of the ozonation byproducts.

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“…7 Researchers using microporous polypropylene hollow-fiber membranes for gaseous ozone transfer to water found that ozone reacted with the fibers, decreasing the mass transfer rate of ozone and leaving the fibers brittle. 8 Membrane air-stripping was applied at pilot scale for assessment of its performance in treating a groundwater contaminated with trichloroethene (TCE). The process was used continuously for 75 days, and a 30 percent reduction in removal efficiency occurred over that period.…”

Section: Introductionmentioning

confidence: 99%

Membrane air‐stripping: effects of pretreatment

Castro¹,

Zander²

1995

Journal AWWA

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MEMBRANE PROCESSESs a result of the Safe Drinking Water Act and its 1986 amendments, the number of regulated volatile organic chemicals (VOCs) has increased substantially. 1 The discovery of drinking water supply sources contaminated by VOCs is also increasing. These factors have led to the development of alternative treatment methods for control of VOCs.Packed-tower aeration (PTA) is currently the most common treatment strategy for VOCs in drinking water and is considered by the US Environmental Protection Agency to be a best available treatment technology. 2 Air-stripping of VOCs with microporous Microporous polypropylene hollow-fiber membranes offer significant advantages over packed-tower aeration for removing volatile organic chemicals. A laboratory study assessed the performance of membrane air-stripping in continuous operation, while exposed to various pretreatments. Results indicate that membrane air-stripping is compatible with low-pH or lowchlorine waters but not with waters of high pH or high-chlorine concentration or those that are ozonated.

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A novel approach to ozone ‐ water mass transfer using hollow ‐ fiber reactors

Cited by 12 publications

References 10 publications

Modelling of Ozone Mass-Transfer through Non-Porous Membranes for Water Treatment

Modelling of Ozone Mass-Transfer through Non-Porous Membranes for Water Treatment

Fabrication of Catalytic Membranes for the Treatment of Drinking Water Using Combined Ozonation and Ultrafiltration

Membrane air‐stripping: effects of pretreatment

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