Oxidation of Polynuclear Aromatic Hydrocarbons in Water. 2. UV Radiation and Ozonation in the Presence of UV Radiation

Beltrán, Fernando J.; Ovejero, Gabriel; García‐Araya, Juan F.; Rivas, Javier

doi:10.1021/ie00044a013

Cited by 157 publications

(95 citation statements)

References 19 publications

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“…Gregory et al [30] reported no significant concentration effect on the quantum yield of dibenzothiophene sulfoxide over a range of 0.5-30 mM. In contrast Miller and Olejik [7] and Beltran et al [6] reported higher rates of photodegradation at higher initial concentration of FLU, chrysene, benzo[a]pyrne, phenanthrene, and acenaphthene. These results were explained by higher absorption by the organic compound as their concentration was increased and consequently the observed rate of the reaction increased.…”

Section: Initial Concentration Of Pahsmentioning

confidence: 97%

“…Among the engineered processes bioremediation is generally considered having cost and technical advantages [5]. Advanced oxidation processes (AOPs), by which hydroxyl radicals are generated in order to destroy the organic contaminant, were also studied as an alternative to or in combination with biodegradation for removal of PAHs from aqueous solutions [6][7][8][9][10]. The highly reactive hydroxyl radicals, generated during AOPs, can lead to complete mineralization of the pollutant but most typically lead to formation of products of higher polarity and solubility in water such as phenols, quinones, and acids [11][12].…”

Section: Introductionmentioning

confidence: 99%

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Photolysis, oxidation and subsequent toxicity of a mixture of polycyclic aromatic hydrocarbons in natural waters

Shemer

Linden

2007

Journal of Photochemistry and Photobiology A: Chemistry

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Photodegradation of a mixture of three polycyclic aromatic hydrocarbons fluorene (FLU), dibenzofuran (DBF), and dibenzothiophene (DBT) using UV and UV/H 2 O 2 processes was studied. Treating a mixture of the PAHs stimulated a more realistic contamination composition present in polluted water. Effects of pH, PAH concentration, and water matrix composition on removal rates and efficiencies of these compounds are discussed. Batch experiments were conducted using both monochromatic low pressure (LP, 253.7 nm) and polychromatic medium pressure (MP, 200-400 nm) UV sources, in a quasi-collimated beam setup. A synergistic effect was observed during direct photolysis and LP-UV/H 2 O 2 of the mixture as compared to photodegradation as a single component in an aqueous solution. Similar results were obtained for FLU using MP-UV/H 2 O 2 whereas, degradation of DBF and DBT was inhibited in a mixture. Natural water enhanced the direct photolysis compared to laboratory buffered water, whereas, degradation of the PAHs in the natural water was inhibited using UV/H 2 O 2 process. Toxicity testing using a luminescent inhibition bioassay was correlated to intermediates generated during UV-based oxidation reactions.

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Section: Initial Concentration Of Pahsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Photolysis, oxidation and subsequent toxicity of a mixture of polycyclic aromatic hydrocarbons in natural waters

Shemer

Linden

2007

Journal of Photochemistry and Photobiology A: Chemistry

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“…It is believed that the inactive biological forms, such as pyrene, acquire toxic properties under such conditions [Smol et al, 2011]. Ozone constitutes a more efficient and a safer oxidant, ensuring greater degree of PAH removal with much shorter contact time [Beltran, 1995]. However, the products of PAH oxidation with ozone may be toxic and rapidly react with chlorine; therefore, an additional process, e.g.…”

Section: Removal Of Hardly Bio-degradabale Organic Compounds From Wasmentioning

confidence: 99%

Removal of Hardly Bio-Degradabale Organic Compounds From Wastewater by Means of Reagentless Methods

Szulżyk-Cieplak

2017

J. Ecol. Eng.

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The paper discusses the issue of removing persistent organic pollutants (POPs) from wastewater, especially the polycyclic organic hydrocarbons (PAHs). The results obtained in literature studies indicate that the commonly employed traditional methods of wastewater treatment are not always efficient in eliminating the hardly bio-degradable pollutants. Therefore, extensive research is being conducted on the application of efficient POPs removal technologies. One of the considered variants involves incorporating advanced oxidation processes (AOP) into the wastewater treatment systems based on the biological processes. These include the reagentless methods, e.g. the processes involving ultrasounds and hydrodynamic cavitation. On the basis of the author's own studies conducted in a laboratory system comprising a static cavitation reactor, the possibility of applying hydrodynamic cavitation for the decomposition of PAHs was evaluated on the basis of model solutions of anthracene and phenanthrene. It was shown that the employed advanced oxidation process with hydro-cavitation has a significant impact on reducing the concentration of the considered PAHs. It was confirmed that the degradation degree of a substance depends on the intensity and the course of the cavitation process. The energy efficiency of the conducted process was analyzed as well and expressed as the ratio pertaining to the amount of the degraded compound to the electric energy supplied to the system.

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“…Polycyclic aromatic hydrocarbons (PAHs) were also the subject of the study [9][10][11], but despite the importance of such investigation the literature is scarce.…”

Section: Introductionmentioning

confidence: 99%

“…The degradation of FLU, phenanthrene, and acenaphthene applying O 3 /UV was studied by Beltran et al [11]. The influence, among others, of the presence of hydroxyl radicals inhibitors and pH of the reaction solution was investigated.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of PAHs in water solution by ozone combined with ultraviolet radiation

Miller¹,

Olejnik²

2001

International Journal of Photoenergy

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Abstract. The oxidation of three polycyclic aromatic hydrocarbons (PAHs): benzo[a]pyrene (BAP), chrysene (CHR) and fluorene (FLU) in aqueous solution using ozone assisted by UV radiation was investigated. The influence of pH of the reaction mixture, ozone concentration and the presence of a radical scavenger on the reaction rate was determined. The highest rate of PAHs disappearance was achieved in acidic solutions. The radical scavenger-tert -butanol, effectively inhibited the rate of BAP and CHR destruction but had a slight influence in the case of FLU. The rate constants of direct reaction of PAHs with ozone were calculated using our earlier investigations and they were equal to 6.8 × 10 4 ; 6.9 × 10 3 and 62 M −1 s −1 for BAP, CHR and FLU, respectively. The contributions of direct ozonolysis, photolysis and radical reaction to PAHs oxidation in O 3 /UV system were evaluated.

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Oxidation of Polynuclear Aromatic Hydrocarbons in Water. 2. UV Radiation and Ozonation in the Presence of UV Radiation

Cited by 157 publications

References 19 publications

Photolysis, oxidation and subsequent toxicity of a mixture of polycyclic aromatic hydrocarbons in natural waters

Photolysis, oxidation and subsequent toxicity of a mixture of polycyclic aromatic hydrocarbons in natural waters

Removal of Hardly Bio-Degradabale Organic Compounds From Wastewater by Means of Reagentless Methods

Oxidation of PAHs in water solution by ozone combined with ultraviolet radiation

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