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| Titel: |
SOLID-LIQUID MASS TRANSFER STUDY OF THE OZONATION OF PHENANTHRENE |
| Auteur: |
Cornell, Linda P. Kuo, Chiang Hai |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 101 (1991) nr. 1 pagina's 61-75 |
| Jaar: |
1991-03-01 |
| Inhoud: |
Phenanthrene, a priority, hazardous pollutant, is found in the vapor and paniculate phase in the atmosphere as well as in aquatic ecosystems. Water droplets can form around the particulates and dissolve the phenanthrene. Subsequent oxidation of the phenanthrene by ozone can result in the formation of secondary pollutants. Thus the mass transfer of solid phenanthrene with and without ozonation reactions in water is investigated and a simple mathematical model based on film theory is formulated to predict the changes in bulk ozone concentrations and enhancement factors. Physical mass transfer coefficients for phenanthrene in water measured at room temperature in an agitated vessel increased from 1·174 ×10-5 to 2·932 × 10-5 m/s as the agitation speed increased from 65 to 315 RPM. The ozonation of phenanthrene significantly increases the mass transfer rates of phenanthrene into water as indicated by enhancement factors which range from 2 to 7·8. At low agitation speeds, the film model agreed well with the experimental data regarding the rates of disappearance and concentrations of the bulk ozone. However, the calculated and measured concentrations of ozone deviated as much as 55% at high speeds of agitation probably due to turbulent effects. Nevertheless, the model is useful for estimating the enhancement factor; the theoretical and experimental values are in good agreement with the maximum deviation of 25%. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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