The ROH,UV Concept to Characterize and the Model UV/H2O2 Process in Natural Waters

Rosenfeldt, Erik J.; Linden, Karl G.

doi:10.1021/es062353p

Cited by 127 publications

(104 citation statements)

References 15 publications

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“…The overall effect of OH radical scavenging from humic acid (HA) and anions HCO 3 À , NO 3 À was examined by the new R OH,UV probe compound method, developed by Rosenfeldt E. J. (Rosenfeldt and Linden, 2007). Based on the above data, using a steadystate OH radical model, the oxidation rate constants of the selected PhACs were predicted for the UV/H 2 O 2 process.…”

Section: Introductionmentioning

confidence: 99%

“…But the other method, called as the new R OH,UV probe compound method, developed by Rosenfeldt E. J. (Rosenfeldt and Linden, 2007), handled this problem caused by the traditional method. The R OH,UV concept is defined as the experimentally determined OH radical exposure per UV fluence, and it was determined by examining the aqueous photodegradation of pCBA as a probe compound.…”

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confidence: 99%

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Degradation of selected pharmaceuticals in aqueous solution with UV and UV/H2O2

et al. 2009

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Photolysis Hydroxyl radicals Kinetics ByproductDegradation mechanism a b s t r a c tThe degradation of four pharmaceutical compounds (PhACs), ibuprofen (IBU), diphenhydramine (DP), phenazone (PZ), and phenytoin (PHT) was investigated via ultraviolet (UV) photolysis and UV/H 2 O 2 process with a low-pressure (LP) UV lamp. For each PhAC tested, direct photolysis quantum yields at 254 nm were found to be ranging from 6.32 Â 10 À2 to 2.79 Â 10 À1 mol E À1 at pH 7. The second-order rate constants of the reaction between the PhACs and OH were determined to be from 4.86 Â 10 9 to 6.67 Â 10 9 M À1 s À1 by using a competition kinetic model which utilized para-chlorobenzoic acid ( pCBA) as a reference IntroductionPharmaceutical compounds (PhACs) are developed and manufactured for specific biological effects, to improve human and animal health care, and livestock farming. PhACs are continuously introduced into the environment and are prevalent at small concentrations (Kolpin et al., 2002), which can affect water quality and potentially impact drinking water supplies, ecosystem and human health (Heberer, 2002b;Roefer et al., 2000;Trussell, 2001). Some of the adverse effects caused by pharmaceutical pollution include aquatic toxicity, resistant development in pathogenic bacteria, genotoxicity, and endocrine disruption (Halling-Sørensen et al., 1998;Kü mmerer, 2004;Sumpter, 1998). The presence of trace pharmaceutical and other xenobiotic compounds in finished drinking water is another public health concern, since little is known about potential chronic health effects associated with long term ingestion of mixtures of these compounds through drinking water (Kü mmerer, 2001;Stackelberg et al., 2004). Thus, it is an emerging issue in environmental science and * Corresponding author. Tel.: þ86 10 62849628; fax: þ86 10 62923541. E-mail address: huchun@rcees.ac.cn (C. Hu).A v a i l a b l e a t w w w . s c i e n c e d i r e c t . w a t e r r e s e a r c h 4 3 ( 2 0 0 9 ) 1 7 6 6 -1 7 7 4

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Degradation of selected pharmaceuticals in aqueous solution with UV and UV/H2O2

et al. 2009

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“…In the UV/H 2 O 2 process, HO• is formed mainly when H 2 O 2 is photo-dissociated by UV radiation in the range of 200-280 nm (Crittenden et al 1999;Rosenfeldt and Linden 2007;Tchobanoglous et al 2005). After this limiting step, radicals will rapidly undergo non-selective reactions with organic compounds and other substances present in the aqueous solution leading to new radical formation and termination reactions (Crittenden et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Recent developments in photochemical and chemical AOPs in water treatment: a mini-review

Vilhunen

Sillanpää

2010

Rev Environ Sci Biotechnol

120

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Photochemical and chemical oxidation methods, belonging to a wide group of advanced oxidation processes (AOPs), are extensively studied but still under constant development. The aim of this study was to review the recent developments mainly in UV/H 2 O 2 process and Fenton's reactions. Ultraviolet (UV) radiation is an essential factor in photochemical oxidation. In the development of UV radiation sources the energy efficiency and the use of toxicant free materials have become major objectives. Also the emitted wavelength plays a significant role. Besides, there are alternatives for UV radiation sources, such as radio frequency (RF) plasmas, which can operate in water without additional chemicals. A remarkable development in the field of chemical oxidation has been novel catalyst materials for Fenton's reaction enabling the efficient reaction in neutral or almost neutral conditions, instead of pH below 3. In addition, varieties of method integrations, e.g., combinations of AOPs or AOPs integrated to biological processes, and other enhancements such as combining ultrasound (US) with AOP have led to improved water treatment efficiencies.

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“…23 Therefore, MB can be used as a benchmark test for H 2 O 2 /UV AOPs. 23,25 In parallel, experiments were run in the H 2 O 2 /UV experimental set-up and on UV-collimated beam device (CBD, type 11-1 by Wedeco, Germany) in petri dishes, where accurate applied UV dosages can be established based on the exposure time of the sample and the known geometry of the petri dish and the UV fluence rate distribution. 23 For a known UV dosage from CBD tests, MB degradation can be determined using the UV-VIS spectroscopy by the reduction of light absorbance (at a wavelength of 610 nm in this research).…”

Section: Calibration Of Dose-performance Of the Uv Systemmentioning

confidence: 99%

The Enhancement of H2O2/UV AOPs for the Removal of Selected Organic Pollutants from Drinking Water with Hydrodynamic Cavitation

Čehovin

Medic²,

Kompare

et al. 2016

ACSi

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Drinking water contains organic matter that occasionally needs to be treated to assure its sufficient quality and safety for the consumers. H 2 O 2 and UV advanced oxidation processes (H 2 O 2 /UV AOPs) were combined with hydrodynamic cavitation (HC) to assess the effects on the removal of selected organic pollutants. Water samples containing humic acid, methylene blue dye and micropollutants (metaldehyde, diatrizoic acid, iohexol) were treated first by H 2 O 2 (dosages from 1 to 12 mg L -1 ) and UV (dosages from 300 to 2800 mJ cm -2 ) AOPs alone and later in combination with HC, generated by nozzles and orifice plates (4, 8, 18 orifices). Using HC, the removal of humic acid was enhanced by 5-15%, methylene blue by 5-20% and metaldehyde by approx. 10%. Under favouring conditions, i.e. high UV absorbance of the matrix (more than 0.050 cm -1 at a wavelength of 254 nm) and a high pollutant to oxidants ratio, HC was found to improve the hydrodynamic conditions in the photolytic reactor, to improve the subjection of the H 2 O 2 to the UV fluence rate distribution and to enhance the removal of the tested organic pollutants, thus showing promising potential of further research in this field.

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The R_OH,UV Concept to Characterize and the Model UV/H₂O₂ Process in Natural Waters

Cited by 127 publications

References 15 publications

Degradation of selected pharmaceuticals in aqueous solution with UV and UV/H2O2

Degradation of selected pharmaceuticals in aqueous solution with UV and UV/H2O2

Recent developments in photochemical and chemical AOPs in water treatment: a mini-review

The Enhancement of H2O2/UV AOPs for the Removal of Selected Organic Pollutants from Drinking Water with Hydrodynamic Cavitation

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