Ozonation and Advanced Oxidation Processes of Polycyclic Aromatic Hydrocarbons in Aqueous Solutions - A Kinetic Study

Trapido, Marina; Veressinina, Yelena; Munter, Rein

doi:10.1080/09593331608616312

Cited by 60 publications

(42 citation statements)

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“…The highest values were obtained for BAP 6.8 × 10 4 M −1 s −1 and the smallest ones for FLU 62 M −1 s −1 . These values are a little higher than the literature data, determined for "pure" ozonolysis, 6.2 × 10 4 M −1 s −1 for BAP [24] and 29 M −1 s −1 for FLU [11]. The rate constant of CHR ozonolysis equals to 6.9 × 10 3 M −1 s −1 and to our knowledge, has been determined for the first time.…”

Section: The Kinetic Study the Degradation Of Pahscontrasting

confidence: 46%

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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Section: The Kinetic Study the Degradation Of Pahscontrasting

confidence: 46%

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

Miller¹,

Olejnik²

2001

International Journal of Photoenergy

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“…They are major byproducts of incomplete thermal combustion of fossil fuels. Automobile exhausts, power plants, chemical, coke and oil-shale industries, urban sewage (Trapido et al, 1995), cigarette smoke and charcoal grilled foods are the major emission sources of environmental PAHs. PAHs are also found in the heavier fractions of petroleum products, e.g., lubricating oils, asphalt, and tarlike materials .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Processes for In-Situ Treatment of Contaminated Soils - Final Report - 09/15/1996 - 01/31/2001

Huang¹

2001

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Contamination of soils by toxic organic pollutants is an environmental concern. The insitu electrokinetic (EK) technology is an emerging process to remediate the contaminated soils. Since the electro-osmotic (EO) flow rate and sorption behaviors of pollutants are two critical factors of the process, this study focuses on understanding the partition of nonionic organic contaminants in soil-water system, mechanisms of the EO flow, and the transport of organic compounds under an externally applied electrostatic field. The target compounds include chlorinated organic compounds and polycyclic aromatic hydrocarbons (PAHs). In order to improve the treatment efficiency, surfactant and bio-surfactant were used. A thermodynamic concept, fugacity, was introduced to illustrate the interactions between organics and the soil. A semi-empirical equation was derived to describe the EO flow rate in unsaturated soils. Moverover, the diffusion-advection-sorption model was used to simulate the transport of nonionic organic contaminants in the presence of an electrostatic field.The sorption experiments were conducted with various initial solute concentrations and different soil to solution ratios. The selected chlorinated organics include tetrachloroethylene (PCE), trichloroethylene (TCE), carbon tetrachloride, and chloroform. Results show that Langnuir isotherm can be used to express the distribution behavior of these chlorinated organic compounds i n the soil-water system. In addition to the hydrophobicity (K ow ), the concentration of organic compound and soil to solution ratio can influence the distribution behavior also. In order to illustrate the effects of the organic concentration and soil to solution ratio, the activity coefficient was used.The activity coefficient, γ, a relative interaction based on chosen reference state, is a useful means to express the quantitative feature of the organic-soil interaction without detailed information of their interaction mechanisms. By comparing the activity coefficients, γ w and γ s (i.e., X s /X w ), one can illustrate the trend of organic distribution at the soil-water interfaces.The concentration effect can be explained by the changes in the adsorption of organic onto the soil surface. Based on the experimental results, when increasing the organic compound concentrations, the activity coefficient, γ w , can be considered as a constant and γ s increases due to the increase of interaction energy. The change of γ s makes the sorption isotherms of PCE, TCE, carbon tetrachloride, and chloroform non-linear. According to γ s , it can be seen that the sorption between these selceted chlorinated organics and the soil is exothermic.The effect of soil to solution ratio can be attributed to the presence of dissolved organic matter (DOM) in the liquid phase. DOM enhances the organic dissolution, which in turns increases the organic concentration, i.e., X w . Therefore, the partition coefficients of these chlorinated compounds, i.e., X s /X w , decrease with increasing the soil to solution ...

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“…By contrast, benzo(a)pyrene was not biodegradable in the soil microcosm but its ozone-transformed products were ( Figure 6B). This stark difference is likely due to very low solubility and high adsorption properties of the parent benzo(a)pyrene (0.0038 mg L −1 ; Mackay and Hoigne, 1977;Cerniglia, 1992;Trapido et al, 1995;Miller and Hawthorne, 1998;log Koc = 6.7 L kg −1 ;McCarthy and Jimenez, 1985;Torben et al, 1997) versus the more polar functional groups found on the degradation products. While individual degradation products were not identified in this study, past research has shown that ozonation of benzo(a)pyrene could include quinones, aromatic diols, and short chain alkanes (Moriconi et al, 1961;Huang et al, 2002;Brown et al, 2003;Koeber et al, 2006).…”

Section: Biodegradation In Soil Microcosmsmentioning

confidence: 99%

“…Likewise, transformation rates of benzo(a)pyrene also decreased (4.4 min −1 vs. 0.79 min −1 ). Given that these two PAHs have different solubilities (phenanthrene = 1.3 mg L −1 ; benzo(a)pyrene = 0.0038 mg L −1 ; Mackay and Hoigne, 1977;Cerniglia, 1992;Trapido et al, 1995;Miller and Hawthorne, 1998) and that the benzo(a)pyrene would have been initially present in both dissolved and precipitated phases, it is noteworthy that the higher ring benzo(a)pyrene was transformed faster (Figure 4). This order however, does follow what would be predicted from the Clar structures (Table SM-2).…”

Section: Short and Long-term Ozonation Of Pahs And Related Degradatesmentioning

confidence: 99%

“…Therefore, at the ozone rate applied (1.5 mg min −1 ), H 2 O 2 did not improve the transformation rate because it was reducing the available O 3 present in solution to generate hydroxyl radicals (Beltŕan et al, 1996a;Beltŕan et al, 1996b;Trapido et al, 1994;Trapido et al, 1995). Thus, it may be concluded that the phenanthrene destruction proceeds mostly by molecular ozone (direct reactions) (Beltŕan et al, 1996a;Beltŕan et al, 1996b;Trapido et al, 1994;Trapido et al, 1995). However, by holding the H 2 O 2 concentration constant (0.01 M) and increasing the ozone rate (0.15-2.25 mg min −1 ), a steady increase in phenanthrene degradation was observed ( Figure 2).…”

Section: Short and Long-term Ozonation Of Pahs And Related Degradatesmentioning

confidence: 99%

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A combined chemical and biological approach to transforming and mineralizing PAHs in runoff water

et al. 2014

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Ozonation and Advanced Oxidation Processes of Polycyclic Aromatic Hydrocarbons in Aqueous Solutions - A Kinetic Study

Cited by 60 publications

References 0 publications

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

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

Electrochemical Processes for In-Situ Treatment of Contaminated Soils - Final Report - 09/15/1996 - 01/31/2001

A combined chemical and biological approach to transforming and mineralizing PAHs in runoff water

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