Convergence of DNAPL source strength functions with site age

Environmental Science & Technology
X Chen, James W Jawitz

Abstract

Dissolution of dense nonaqueous phase liquid (DNAPL) source zones can be accurately predicted based on appropriate characterization of the source zone architecture, which controls the rate of mass discharge or source strength function. However, the architecture changes temporally as the source zone mass is depleted by dissolution. To generalize comparisons between contaminated sites with different porewater velocities or contaminant solubilities, site age is defined in terms of the fraction of contaminant mass that has been eluted from the source zone by aqueous dissolution. Here changes in DNAPL architecture during dissolution of a source zone were measured by light transmission visualization in laboratory flow chambers. Architectures measured at ages corresponding to initial conditions, 20, 50, and 90% mass removal were used in an equilibrium streamtube (EST) model to accurately predict subsequent dissolution. It is shown both experimentally and theoretically that as DNAPL contaminated sites age, fractional reductions in contaminant discharge and mass converge to become equal, regardless of the initial architecture. This behavior is a consequence of convergence from log-normal to exponential behavior. Analysis of errors in di...Continue Reading

References

Jun 5, 2004·Journal of Hazardous Materials·K SogaT H Illangasekare
Jul 9, 2004·Journal of Contaminant Hydrology·Jianting Zhu, Jonathan F Sykes
Feb 15, 2005·Environmental Science & Technology·Michael O Rivett, Stanley Feenstra
Oct 21, 2006·Environmental Science & Technology·Eric J Suchomel, Kurt D Pennell
Mar 18, 2008·Journal of Contaminant Hydrology·Nandita B BasuJames W Jawitz
Apr 15, 2008·Journal of Contaminant Hydrology·Erica L Difilippo, Mark L Brusseau

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Citations

Aug 15, 2014·Journal of Contaminant Hydrology·Fang WangJames W Jawitz
Dec 3, 2014·Journal of Contaminant Hydrology·Michael O RivettGary P Wealthall
Jul 28, 2012·Ground Water·Bart T WilkingTissa H Illangasekare
Jun 29, 2014·Journal of Contaminant Hydrology·C D JohnstonS Rhodes
Oct 26, 2016·Journal of Contaminant Hydrology·Minjune YangJames W Jawitz
Feb 20, 2019·Journal of Contaminant Hydrology·Minjune YangJames W Jawitz
Oct 27, 2018·Journal of Contaminant Hydrology·Michael C BrooksMichael D Annable
May 31, 2017·Journal of Contaminant Hydrology·Minjune YangJames W Jawitz
Jun 30, 2019·Journal of Contaminant Hydrology·Alexander A HaluskaMichael D Annable

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