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

2001 ◽  
Vol 3 (2) ◽  
pp. 95-101 ◽  
Author(s):  
Stanislaw Ledakowicz ◽  
Jacek S. Miller ◽  
Dorota Olejnik
Keyword(s):  
Aqueous Solution ◽  
Aromatic Hydrocarbons ◽  
Reaction Rate ◽  
Water Solution ◽  
Radical Reaction ◽  
Radical Scavenger ◽  
Direct Reaction ◽  
Acidic Solutions ◽  
Polycyclic Aromatic ◽  
Influence Of Ph

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 influencein thecaseof FLU. Therateconstants of direct reaction of PAHs with ozonewe recalculate d using our earlier investigations and they were equal to6.8×104;6.9×103and62M-1s-1for BAP, CHR and FLU, respectively. The contributions of direct ozonolysis, photolysis and radical reaction to PAHs oxidation inO3/UVsystem were evaluated.

scholarly journals Oxidation of PAHs in water solutions by ultraviolet radiation combined with hydrogen peroxide

1999 ◽  
Vol 1 (1) ◽  
pp. 55-60 ◽  
Author(s):  
Stanislaw Ledakowicz ◽  
Jacek S. Miller ◽  
Dorota Olejnik
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Rate ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Acidic Solution ◽  
Radical Reaction ◽  
Radical Scavenger ◽  
Oxidation Reactions ◽  
Polycyclic Aromatic ◽  
Influence Of Ph

The destruction of three polycyclic aromatic hydrocarbons (PAHs): benzo[a]pyrene, chrysene and fluorene in aqueous solution using advanced oxidation processH2O2/UVwas investigated. The influence of pH, initial hydrogen peroxide and radical scavenger concentrations on the reaction rate was studied. The oxidation reactions most rapidly run in neutral and acidic solution at optimal hydrogen peroxide concentration (ca. 0.01 M). The degradation of benzo[a]pyrene and chrysene follows radical reaction, for fluorene the mechanism is not clear. The rate constants of the hydroxyl radicals and selected PAHs reaction were found to be2.53×1010,9.82×109and2.77×109M−1S−1for benzo[a]pyrene, chrysene and fluorene, respectively

Continuous Ozonation of Polycyclic Aromatic Hydrocarbons in Oil/Water-Emulsions and Biodegradation of Oxidation Products

1999 ◽  
Vol 40 (4-5) ◽  
pp. 107-114 ◽  
Author(s):  
A. Kornmüller ◽  
U. Wiesmann
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Biological Treatment ◽  
Reaction Rate ◽  
Oxidation Products ◽  
Direct Reaction ◽  
Biological Degradation ◽  
Polycyclic Aromatic ◽  
Oil Water ◽  
Treatment Step

The continuous ozonation of polycyclic aromatic hydrocarbons (PAH) was studied in a two stage ozonation system followed by serobic biological degradation. The highly condensed PAH benzo(e)pyrene and benzo(k)fluoranthene were oxidized selectiely in synthetic oil/water-emulsions. The influence of the ozone mass transfer gas-liquid on the reaction rate of benzo(k)fluoranthene was studied for process optimization. The dissolved ozone concentration is influenced by temperature to a higher degree than the reaction rate of PAH. In dependence on pH, PAH oxidation occurs by a direct reaction with ozone inside the oil droplets. Two main ozonation products of benzo(e)pyrene were quantified at different retention times during ozonation and their transformation could be shown in the biological treatment step.

scholarly journals Adsorption of Polycyclic Aromatic Hydrocarbons (PAHS) from Aqueous Solutions on Different Sorbents

2014 ◽  
Vol 13 (2) ◽  
pp. 87-96 ◽  
Author(s):  
Marzena Smol ◽  
Maria Włodarczyk-Makuła ◽  
Dariusz Włóka
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Aromatic Hydrocarbons ◽  
Environmental Samples ◽  
Sorption Process ◽  
Mineral Sorbent ◽  
Polycyclic Aromatic ◽  
Individual Hydrocarbons ◽  
Treatment Procedures

Abstract This paper presents the results of the possibility and effectiveness of PAHs removal from a model aqueous solution, during the sorption on the selected sorbents. Six PAHs (naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene) listed by EPA for the analysis in the environmental samples were determined. Model aqueous solution was prepared with RESTEK 610 mix PAHs standard. After the sorption process, decrease in the concentration of individual hydrocarbons was observed. The removal percentage was dependent on the type of sorbent (quartz sand, mineral sorbent, activated carbon). The highest efficiency (98.1%) was observed for activated carbon.. The results shows that the sorption processes can be used in aqueous solutions treatment procedures.

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