MEMBRO3X, a Novel Combination of a Membrane Contactor with Advanced Oxidation (O3/H2O2) for Simultaneous Micropollutant Abatement and Bromate Minimization

Merle, Tony; Pronk, Wouter; Gunten, Urs von

doi:10.1021/acs.estlett.7b00061

Cited by 51 publications

(34 citation statements)

References 23 publications

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“…The small site occupancy for household water purifiers means that the technologies adopted must remove BrO − 3 within a short contact time and at high operational cost. The methods of degrading BrO − 3 from drinking water include activated carbon or resin adsorption [2], electron beam irradiation [3], membrane separation [4], biological reduction [5], zero-valent iron (ZVI) reduction [6], photo [7] or photocatalytic reduction [8], layered double hydroxide reduction [9], advanced reduction processes (ARPs) [10], and so on. Among these technologies, hydrated electron (e − aq )-based ARPs distinguished themselves in BrO − 3 degradation due to the high rate constants between e − aq and BrO − 3 (~10 9 M −1 ·s −1 ) [10,11]; thus, they show potential for their use in household drinking water purifiers, which are characterized by a small hydraulic retention time.…”

Section: Introductionmentioning

confidence: 99%

Efficient Reduction of Bromate by Iodide-Assisted UV/Sulfite Process

et al. 2018

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Bromate (BrO − 3 ) residue in drinking water poses a great health risk. Ultra-fast reduction of BrO − 3 , under aerobic conditions, was realized using an ultraviolet (UV)/sulfite process in the presence of iodide (UV/sulfite/iodide). The UV/sulfite/iodide process produced BrO − 3 removal efficiency of 100% at about 5 min with complete conversion to bromide, while UV/sulfite induced 13.1% BrO − 3 reduction under the same conditions. Hydrated electrons, generated from the photolysis of sulfite and iodide, was confirmed as the main contributor to BrO − 3 degradation (77.4% of the total contribution). As the concentration of iodide was kept constant, its presence remarkably enhancing the generation of hydrated electrons led to its consideration as a homogeneous catalyst in the UV/sulfite/iodide system. Sulfite played a role not only as a hydrated electron precursor, but also as a reactive iodine species shielding agent and a regenerant of iodide. Results surrounding the effects on common water quality parameters (pH, bicarbonate, nitrate, natural organic matter, and solution temperature) indicated that preferred degradation of BrO − 3 occurred in an environment of alkaline pH, low-content natural organic matter/bicarbonate/nitrate, and high natural temperature.(I − )/nitrilotriacetic acid [14,15], vacuum-UV irradiation [7], and photoexcitation of organic chromophores [16]. From a practical perspective, the key for-based ARPs is generating e − aq efficiently under ambient conditions. Hydrated electron generation by UV activation of sulfite (UV/sulfite) is promising due to its oxygen self-cleaning property. However, e − aq generation by UV/sulfite was dependent on a high concentration of sulfite and high pH due to the relatively low absorptivity and the protonation of sulfite. Recently, Li etc.[17] proposed a UV/sulfite/I − process to generate e − aq , and successfully realized efficient degradation of monochloroacetic acid (12.86 µM·min −1 ). Enhanced production of e − aq through such a process was based on two facts: (1) both sulfite and I − act as e − aq precursors; (2) sulfite can reduce the e − aq scavenging by reactive iodine species (RIS, e.g., I • , I •− 2 , and I − 3 ). Given the similar rate constant of e − aq toward monochloroacetic acid (1.0 × 10 9 M −1 ·s −1 [18]) and BrO − 3 (3.4 × 10 9 M −1 ·s −1 [10]), it is reasonable to speculate that the UV/sulfite/I − process can also degrade BrO − 3 with high efficiency. Yet, to the authors' knowledge, there exist no other reports using this process to degrade BrO − 3 under aerobic conditions. Furthermore, the BrO − 3 degradation performance using the UV/sulfite/I − process under aerobic conditions, and the possible factors that may affect the degradation efficiency (i.e., pH, anions, and natural organic matter (NOM)) are yet to be investigated.In this work, we aimed to (1) investigate the reduction efficiency of BrO − 3 in prepared water and real water in the UV/sulfite/I − process; (2) explore the mechanism of BrO − 3 reduction (role of sulfite/I − and contributo...

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Section: Introductionmentioning

confidence: 99%

Efficient Reduction of Bromate by Iodide-Assisted UV/Sulfite Process

et al. 2018

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“…The modular design of membrane contactors allows accurate responses to changing treatment needs and convenient maintenance. Particularly relevant for ozone applications is the targeted reduction of the regulated ozonation byproduct bromate that can be achieved when employing membrane contactors [19].…”

Section: Introductionmentioning

confidence: 99%

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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“…Polysulfone (PSF) [39] Polyethersulfone (PES) [40] Polyether ether ketone (PEEK) [41] Polyetherimide (PEI) [42] Polyethylene (PE) [43] Polypropylene (PP) [44] Polyvinylidene fluoride (PVDF) [45] Polytetrafluoroethylene (PTFE) [46] Polymethylpentene (PMP) [47] Polydimethyl siloxane (PDMS) [48]…”

Section: Chemical Structure Referencementioning

confidence: 99%

“…Perhaps the first place in the number of works devoted to hollow fiber membrane contactors is occupied by the acid gas removal: carbon and sulfur dioxides (СО2, SO2) and hydrogen sulfide (H2S) [46] Polymethylpentene (PMP) Fibers 2018, 6, 76 7 of 50 Table 1. Chemical structures of polymer materials used for hollow fibers in membrane contactors.…”

Section: Removal Of Acid Components From Gas Mixturesmentioning

confidence: 99%

Gas-Liquid Hollow Fiber Membrane Contactors for Different Applications

Баженов

Bildyukevich

Volkov

2018

Fibers

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Gas-liquid membrane contactors that were based on hollow fiber membranes are the example of highly effective hybrid separation processes in the field of membrane technology. Membranes provide a fixed and well-determined interface for gas/liquid mass transfer without dispensing one phase into another while their structure (hollow fiber) offers very large surface area per apparatus volume resulted in the compactness and modularity of separation equipment. In many cases, stated benefits are complemented with high separation selectivity typical for absorption technology. Since hollow fiber membrane contactors are agreed to be one of the most perspective methods for CO2 capture technologies, the major reviews are devoted to research activities within this field. This review is focused on the research works carried out so far on the applications of membrane contactors for other gas-liquid separation tasks, such as water deoxygenation/ozonation, air humidity control, ethylene/ethane separation, etc. A wide range of materials, membranes, and liquid solvents for membrane contactor processes are considered. Special attention is given to current studies on the capture of acid gases (H2S, SO2) from different mixtures. The examples of pilot-scale and semi-industrial implementation of membrane contactors are given.

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MEMBRO₃X, a Novel Combination of a Membrane Contactor with Advanced Oxidation (O₃/H₂O₂) for Simultaneous Micropollutant Abatement and Bromate Minimization

Cited by 51 publications

References 23 publications

Efficient Reduction of Bromate by Iodide-Assisted UV/Sulfite Process

Efficient Reduction of Bromate by Iodide-Assisted UV/Sulfite Process

A Single Tube Contactor for Testing Membrane Ozonation

Gas-Liquid Hollow Fiber Membrane Contactors for Different Applications

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