The effect of aquifer heterogeneity on natural attenuation rate of BTEX

Date

2008-04-01

Author

Ucankus, Tuba
Ünlü, Kahraman

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Monitored natural attenuation can be a viable option for remediation of groundwater contamination by BTEX compounds. Under the field conditions, the rate of contaminant mass attenuation through natural processes, such as biodegradation, to a large extent affected by the groundwater flow regime, which is primarily controlled by the aquifer heterogeneity. Numerical simulation techniques were used to describe quantitatively the relationship between biodegradation rate of BTEX and aquifer heterogeneity. Different levels of aquifer heterogeneity were described by random hydraulic conductivity fields (K) having different statistical parameters, the coefficient of variation (CV) and the correlation length (h). The Turning Bands Algorithm was used to generate such K fields. Visual MODFLOW/RT3D was used to simulate the fate and transport of dissolved BTEX plume within heterogeneous aquifers. The multispecies reactive transport approach described BTEX degradation using multiple terminal electron-accepting processes. First-order biodegradation rate constants were calculated from simulated BTEX plumes in heterogeneous flow fields. The results showed that aquifer heterogeneity significantly affected biodegradation rate; it decreased with increasing CV when h was in the range of up to 12 m, whereas it increased with increasing CV when h was greater than about 12 m. For well characterized aquifers, this finding could be of great value in assessing the effectiveness of natural attenuation during feasibility studies at BTEX contaminated sites.

Subject Keywords

General Engineering, Earth and Planetary Sciences (miscellaneous), Soil Science, General Earth and Planetary Sciences, Pollution, General Environmental Science, Water Science and Technology, Environmental Chemistry

URI

https://hdl.handle.net/11511/41998

Journal

ENVIRONMENTAL GEOLOGY

DOI

https://doi.org/10.1007/s00254-007-0861-0

Collections

Department of Environmental Engineering, Article

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Citation Formats

T. Ucankus and K. Ünlü, “The effect of aquifer heterogeneity on natural attenuation rate of BTEX,” ENVIRONMENTAL GEOLOGY, pp. 759–776, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41998.