Abstract
A pilot scale experiment for humic acid-enhanced remediation of diesel fuel, described in Part 1 of this series, is numerically simulated in three dimensions. Groundwater flow, enhanced solubilization of the diesel source, and reactive transport of the dissolved contaminants and humic acid carrier are solved with a finite element Galerkin approach. The model (BIONAPL) is calibrated by comparing observed and simulated concentrations of seven diesel fuel components (BTEX and methyl-, dimethyl- and trimethylnaphthalene) over a 1500-day monitoring period. Data from supporting bench scale tests were used to estimate contaminant-carrier binding coefficients and to simulate two-site sorption of the carrier to the aquifer sand. The model accurately reproduced the humic acid-induced 10-fold increase in apparent solubility of trimethylnaphthalene. Solubility increases on the order of 2-5 were simulated for methylnaphthalene and dimethylnaphthalene, respectively. Under the experimental and simulated conditions, the residual 500-ml diesel source was almost completely dissolved and degraded within 5 years. Without humic acid flushing, the simulations show complete source dissolution would take about six times longer.
Citations
Apr 4, 2015·Journal of Environmental Health Science & Engineering·Masoumeh RavanipourSamireh Hashemi-Najafabadi
Jun 28, 2015·Journal of the American Society for Mass Spectrometry·Mark P BarrowJohn V Headley
Sep 12, 2008·Journal of Biological Engineering·Yanna LiangRonald C Sims
Oct 17, 2014·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Mahmoud D Eljack, Abul Hussam
Sep 8, 2004·Chemosphere·Motoki TerashimaShunitz Tanaka
Sep 16, 2016·Frontiers in Microbiology·Debajyoti GhosalYoungho Ahn
May 22, 2007·Chemosphere·Motoki TerashimaMasami Fukushima
Sep 28, 2004·Biotechnology and Bioengineering·Fabio FavaLeonardo Marchetti
Mar 15, 2006·Bioprocess and Biosystems Engineering·M Alvarez CuencaS R Upreti
Dec 8, 2015·Journal of Environmental Quality·César García-DíazRafael Martínez-Palou
Nov 6, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Nicholas A ValleyGeraldine L Richmond
Jun 22, 2006·Environmental Science & Technology·Sandra RussoldKristin Schirmer
Sep 28, 2010·Journal of Contaminant Hydrology·Juliana G FreitasJames F Barker