Mineralization of organic micropollutants (homologous alcohols and phenols) in water by vacuum-UV-oxidation (H2O-VUV) with an incoherent xenon-excimer lamp at 172 nm

Oppenländer, Thomas; Gliese, S

doi:10.1016/s0045-6535(99)00222-2

Cited by 51 publications

(26 citation statements)

References 25 publications

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“…Interestingly, although without O 3 bubbling, the excimer/TMiP reactor shows the highest k 1 among reactors. We ascribed the results to reactive species and oxidative intermediates generated by VUV photolysis of water as mentioned by Oppenländer et al [24][25][26][27][28]. Hydroxyl radicals and other reactive species are formed by VUV photolysis of water and can directly react with organics due to their strong oxidation potentials.…”

Section: Test Methods For Evaluation Of the Water Purification Abilitymentioning

confidence: 78%

“…The difference in the activity of the reactors among the waterborne pathogens may be due to the size of molecules or bacteria, the surface composition of bacteria or viruses, the critical wavelength for disinfection, and the permeation ability of reactive species. Oppenländer et al also reported VUV-induced oxidation of organics in homogeneous aqueous solution within a xenon-excimer flow-through photoreactor [24]. They found that the decomposition rate was strongly influenced by the size and the structure of the organics, e.g., the homologous series of saturated alcohols C 1 -C 8 was decomposed in descending order of the TOC degraded after an irradiation time of 3 h. In this series 1-octanol was decomposed with the lowest efficiency because of the highest statistical possibility of formation of intermediate products.…”

Section: Test Methods For Evaluation Of the Water Purification Abilitymentioning

confidence: 98%

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Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Ochiai

Masuko

Tago

et al. 2013

Water

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Abstract:The recent applications of a TiO 2 -modified Ti-mesh filter (TMiP™) for water purification are summarized with newly collected data including biological assays as well as sewage water treatment. The water purification reactors consist of the combination of a TMiP, a UV lamp, an excimer VUV lamp, and an ozonation unit. The water purification abilities of the reactor were evaluated by decomposition of organic contaminants, inactivation of waterborne pathogens, and treatment efficiency for sewage water. The UV-C/TMiP/O 3 reactor disinfected E. coli in aqueous suspension in approximately 1 min completely, and also decreased the number of E. coli in sewage water in 15 min OPEN ACCESSWater 2013, 5 1102 dramatically. The observed rate constants of 7.5 L/min and 1.3 L/min were calculated by pseudo-first-order kinetic analysis respectively. Although organic substances in sewage water were supposed to prevent the UV-C/TMiP/O 3 reactor from purifying water, the reactor reduced E. coli in sewage water continuously. On the other hand, although much higher efficiencies for decomposition of organic pollutants in water were achieved in the excimer/TMiP reactor, the disinfection activity of the reactor for waterborne pathogens was not as effective as the other reactors. The difference of efficiency between organic pollutants and waterborne pathogens in the excimer/TMiP reactor may be due to the size, the structure, and the decomposition mechanism of the organic pollutants and waterborne pathogens. These results show that a suitable system assisted by synergy of photocatalysts and other technologies such as ozonation has a huge potential as a practical wastewater purification system.

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Section: Test Methods For Evaluation Of the Water Purification Abilitymentioning

confidence: 78%

Section: Test Methods For Evaluation Of the Water Purification Abilitymentioning

confidence: 98%

Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Ochiai

Masuko

Tago

et al. 2013

Water

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“…Le processus implique généralement le passage de l'eau sous des lampes UV de longueurs d'ondes comprises entre 200 et 300 nm (ZHOU et SMITH, 2001). La photolyse de l'eau induit la réaction suivante (OPPENLÄDER et GLIESE, 2000;PARSONS, 2004) :…”

Section: Traitement Par Photolyse Au Rayonnement Ultravioletunclassified

Revue sur l’état actuel des connaissances des procédés utilisés pour l’élimination des cyanobactéries et cyanotoxines lors de la potabilisation des eaux

Warren

Drogui

Laurion

2010

rseau

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Les toxines cyanobactériennes sont des contaminants importants des écosystèmes aquatiques et constituent un risque pour la santé humaine. Les cyanobactéries peuvent libérer des toxines dans l’eau, particulièrement lors de la lyse des cellules qui se produit souvent au moment de leur passage à travers la filière conventionnelle de potabilisation des eaux. Dans cet article de revue de la littérature, les normes sur la qualité de l’eau concernant les toxines ainsi que les principales méthodes de détection des toxines sont d’abord présentées. Les méthodes d’élimination des cyanobactéries et des cyanotoxines sont ensuite décrites et leur performance discutée. Les procédés conventionnels présentés sont la coagulation/floculation, la clarification, la filtration sur sable, l’utilisation du charbon actif ainsi que l’oxydation chimique par chloration ou par le permanganate de potassium. Les méthodes alternatives présentement en développement pour optimiser les systèmes actuels de potabilisation des eaux ou remplacer les technologies conventionnelles trop peu efficaces pour l’élimination des polluants émergents (par ex., les procédés d’oxydation avancée et la filtration membranaire) sont également présentées. Des procédés conventionnels tels que la chloration peuvent s’avérer inadéquats, notamment par leur manque de fiabilité pour l’oxydation des cyanotoxines et par le risque encouru suite à la formation de sous-produits toxiques (par ex., les organochlorés). Des méthodes alternatives telles que la combinaison d’ozone et de peroxyde d’hydrogène permettent une oxydation fiable des cyanotoxines en assurant un effet rémanent à la sortie du contacteur. Ce type de traitement peut être facilement mis en oeuvre dans les usines de potabilisation des eaux possédant déjà une unité d’ozonation. L’utilisation du charbon actif, notamment sous forme de poudre, peut être efficace lors de contaminations ponctuelles par les fleurs d’eau de cyanobactéries. Ce document fait ainsi une synthèse de ces procédés chimiques, physiques ou physico-chimiques contribuant à l’élimination des cyanotoxines et des cyanobactéries lors de la potabilisation des eaux.Cyanobacterial toxins are important contaminants of aquatic ecosystems and present a risk for human health. Cyanobacteria can release toxins in water, particularly following cell lysis, which often happens during their passage through a conventional water treatment plant. In this literature review, water quality guidelines for the elimination of cyanotoxins and major detection methods of cyanotoxins are briefly presented. The processes used for cyanobacteria and cyanotoxin removal from drinking water are then reviewed and their performance discussed. The conventional methods presented are: coagulation/flocculation, clarification, sand filtration, activated carbon and chemical oxidation with chlorination or potassium permanganate. Alternative methods that are presently developed to enhance existing treatment plants or to replace conventional technologies that are less effective in removing emergen...

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“…Vacuum ultraviolet (VUV, 100 nm<λ<200 nm) which can dissociate water molecule into • OH radicals, hydrogen atoms, and hydrated electron is usually used to decontaminate water and air or to modify the solid surface (Gonzalez et al 2004;Oppenlander and Gliese 2000;Zhang et al 2004). Organic contaminants can be photolysed directly or degraded through water photolysis pathway, in which water is homolyzed into hydrogen atom and • OH radical (Heit et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Sulfamethoxazole Applying UV- and VUV-Based Processes

Mouamfon

et al. 2010

Water Air Soil Pollut

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The efficiency of UV-and VUV-based processes (UV, VUV, UV/H 2 O 2 , and VUV/H 2 O 2 ) for removal of sulfamethoxazole (SMX) in Milli-Q water and sewage treatment plant (STP) effluent was investigated at 20°C. The investigated factors included initial pH, variety of inorganic anions (NO 3 − and HCO 3 − ), and humic acid (HA). The results showed that the degradation of SMX in Milli-Q water at both two pH (5.5 and 7.0) followed the order of VUV/H 2 O 2 > VUV > UV/H 2 O 2 > UV. All the experimental data well fitted the pseudo-first order kinetic model and the rate constant (k) and half-life time (t 1/2 ) were determined accordingly. Indirect oxidation of SMX by generated • OH was the main degradation mechanism in UV/H 2 O 2 and VUV/H 2 O 2 , while direct photolysis predominated in UV processes. The quenching tests showed that some other reactive species along with • OH radicals were responsible to the SMX degradation under VUV process. The addition of 20 mg L −1 HA significantly inhibited SMX degradation, whereas, the inhibitive effects of NO 3 − and HCO 3 − (0.1 mol L −1 )were observed as well in all processes except in UV irradiation for NO 3 − . The removal rate decreased 1.7-3.6 times when applying these processes to STP effluent due to the complex constituents, suggesting that from the application point of view the constituents of these complexes in real STP effluent should be considered carefully prior to the use of UV-based processes for SMX degradation.

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Mineralization of organic micropollutants (homologous alcohols and phenols) in water by vacuum-UV-oxidation (H2O-VUV) with an incoherent xenon-excimer lamp at 172 nm

Cited by 51 publications

References 25 publications

Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Revue sur l’état actuel des connaissances des procédés utilisés pour l’élimination des cyanobactéries et cyanotoxines lors de la potabilisation des eaux

Photodegradation of Sulfamethoxazole Applying UV- and VUV-Based Processes

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