Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

Santos, Felipe Rodrigues Alves dos; Borges, Cristiano Piacsek; Fonseca, Fabiana Valéria da

doi:10.1590/1516-1439.016715

Cited by 30 publications

(14 citation statements)

References 31 publications

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“…However, a slight increase in TOC of water samples after contactor passage, which was detectable but within the analytical error, was found. Ozone exposure induces structural modifications on PDMS [30,32]. Ozone and UV combined oxidize PDMS to form SiO x , by substituting methyl groups with hydroxyl groups [34,58,59], and ozone in the presence of water leads to formation of peroxides on the PDMS surface [60].…”

Section: Membrane Longevitymentioning

confidence: 99%

“…Most polymeric membrane materials are hydrophobic but are prone to reacting with ozone. For example, polymers such as polyethersulfone (PES) and polyetherimide (PEI) possess carbon double bonds that react with ozone, leading to decomposition [30]. Fluoropolymers such as polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF) and polymers without functional groups exhibiting reactivity towards ozone such as plasticizer-free polydimethylsiloxane (PDMS) are more suitable for ozone [31].…”

Section: Introductionmentioning

confidence: 99%

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A Single Tube Contactor for Testing Membrane Ozonation

Zoumpouli

Baker

Taylor

et al. 2018

Water

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A membrane ozonation contactor was built to investigate ozonation using tubular membranes and inform computational fluid dynamics (CFD) studies. Non-porous tubular polydimethylsiloxane (PDMS) membranes of 1.0–3.2 mm inner diameter were tested at ozone gas concentrations of 110–200 g/m3 and liquid side velocities of 0.002–0.226 m/s. The dissolved ozone concentration could be adjusted to up to 14 mg O3/L and increased with decreasing membrane diameter and liquid side velocity. Experimental mass transfer coefficients and molar fluxes of ozone were 2.4 × 10−6 m/s and 1.1 × 10−5 mol/(m2 s), respectively, for the smallest membrane. CFD modelling could predict the final ozone concentrations but slightly overestimated mass transfer coefficients and molar fluxes of ozone. Model contaminant degradation experiments and UV light absorption measurements of ozonated water samples in both ozone (O3) and peroxone (H2O2/O3) reaction systems in pure water, river water, wastewater effluent, and solutions containing humic acid show that the contactor system can be used to generate information on the reactivity of ozone with different water matrices. Combining simple membrane contactors with CFD allows for prediction of ozonation performance under a variety of conditions, leading to improved bubble-less ozone systems for water treatment.

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Section: Membrane Longevitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Single Tube Contactor for Testing Membrane Ozonation

Zoumpouli

Baker

Taylor

et al. 2018

Water

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show abstract

“…Most polymeric membrane materials are hydrophobic but are prone to react with ozone. For example, polymers such as polyethersulfone (PES) and polyetherimide (PEI) possess carbon double bonds that react with ozone leading to decomposition [30]. Fluoropolymers such as polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF) and polymers without functional groups exhibiting reactivity towards ozone such as plasticizer-free polydimethylsiloxane (PDMS) are more suitable for ozone [31].…”

Section: Introductionmentioning

confidence: 99%

A Single Tube Contactor for Testing Membrane Ozonation

Zoumpouli¹,

Baker²,

Taylor³

et al. 2018

Preprint

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A membrane ozonation contactor was built to investigate ozonation using tubular membranes and to inform computational fluid dynamics (CFD) studies. Non-porous tubular polydimethylsiloxane (PDMS) membranes of 1.0 – 3.2 mm inner diameter were tested at ozone gas concentrations of 110 – 200 g m−3 and liquid side velocities of 0.002 m s−1 – 0.226 m s−1. The dissolved ozone concentration could be adjusted to up to 14 mg O3 L−1 and increased with decreasing membrane diameter and liquid side velocity. Experimental mass transfer coefficients and molar fluxes of ozone were 1.1∙10−5 mol m−2 s−1 and 2.4∙10−6 m s−1, respectively, for the smallest membrane. CFD modelling could predict the final ozone concentrations but slightly overestimated mass transfer coefficients and molar fluxes of ozone. Model contaminant degradation experiments and UV absorption measurements of ozonated water samples in both ozone (O3) and peroxone (H2O2/O3) reaction systems in pure water, river water, wastewater effluent and solutions containing humic acid show that the contactor system can be used to generate information on the reactivity of ozone with different water matrices. Combining simple membrane contactors with CFD allows predicting ozonation performance under a variety of conditions leading to improved bubble-less ozone systems for water treatment.

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“…Membranes prepared from these polymers have improved chemical, thermal and mechanical resistance compared with traditional polymers. In addition, they exhibit good resistance to chlorinated compounds (despite the low resistance to mechanical compression) and can be used with non-aqueous solvents 13,14 . Polyamides are materials of high tensile strength, abrasion and fatigue resistance, low friction coefficient and good toughness.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

et al. 2017

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In this work, it was prepared hybrid membranes of polyamide6 (PA6) with montmorillonite (MMT) and porogenic agent (CaCl 2 ). The hybrid membranes with CaCl 2 were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), porosimetry by mercury intrusion (PMI), flux measurements and rejection. By means of X-ray diffraction, it was revealed that the hybrid membranes with CaCl 2 have an exfoliated and/or partially exfoliated structure. For FTIR and DSC of hybrid membranes with CaCl 2 , it was found that the spectra and the crystalline melting temperature remained virtually unchanged compared to PA6 membrane. From the SEM images, it was observed that the addition of the MMT and the CaCl 2 in the membrane of PA6 caused an increase in the amount of pores the surface and cross section of these membranes. By PMI, it was observed that the presence of MMT and CaCl 2 in the membrane caused an increase in the average diameters of pores. The water-oil separation tests, indicated a significant reduction of oil in the permeate, allowing treatment of wastewater contaminated with oil.

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Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

Cited by 30 publications

References 31 publications

A Single Tube Contactor for Testing Membrane Ozonation

A Single Tube Contactor for Testing Membrane Ozonation

A Single Tube Contactor for Testing Membrane Ozonation

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

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