Home / Vol. 24 (2019)

ANALYTICAL MODELLING OF ATTENUATION OF VOLATILE PETROLEUM HYDROCARBONS IN THE VADOSE ZONE

Elazhari Ali, Abdulmagid, Russell Davenport, David Werner

Libya
United Kingdom

DOI: 10.68482/prj.2019.24.008 · Published Dec 2019 · Section: Industrial · Pages: 75–80

Abstract

We applied the measured kapp and Kd parameter values in an analytical model to estimate the extent of the volatile petroleum hydrocarbons from a known source zone, and to compare the model analyses results based on batches experimental data with results based on parameters determined in a field lysimeter experiment. The analytical results of how far a constituent can migrate from a 50cm source zone before its attenuation, based on the field lysimeter date, the distance (r 95%) ranged from 75cm to 350 cm away from the source zone. 75 to 100cm distance from the source zone illustrates the 95% attenuation of toluene and n-octane respectively. While the attenuation distance of cyclohexane and methylcyclopentane was 200 and 250cm respectively, n-pentane, n-hexane and iso-octane have 95% attenuation distance of 350, 200 and 225cm respectively. These data suggest that the significant differences in the attenuation distance from the source zone between the laboratory data and the field data was related to the difference in the apparent biodegradation rates, which were faster for the soil investigated in the laboratory in this study. The data presented illustrate the phenomenon of biodegradation and sorption of VPHs in the unsaturated zone and the analytical model analyses data results demonstrate the VPHs extent of migration form source zone under different scenarios (source zone radius, biodegradation rate and sorption distribution coefficients). All data show that biodegradation by indigenous microorganisms is the key parameter controlling the fate and transport of contaminants in the subsurface.

Keywords

Biodegradation, petroleum volatile hydroc arbons, analytical model

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