Finite element modeling of contaminant transport in soils including the effect of chemical reactions

Javadi, Akbar A.; Al-Najjar, M M

doi:10.1016/j.jhazmat.2007.01.016

Cited by 40 publications

(17 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This above-mentioned remark can be noticed by Spitz and Moreno [9], Zheng and Wang [14], Chiang [3], Konikow et al [6], Javadi and AL-Najjar [4], Zhang et al [13]. So, taking into consideration the above-mentioned remark and substituting equation (16) into equation (11), equation (11) can be rearranged and written as: λ the fi rst-order decay rate usually expressed as a half-life (t 1/2 ) for both the dissolved (aqueous) and the sorbed (solid) phases [s -1 ].…”

Section: General Description Of Contaminant Transport In Groundwater mentioning

confidence: 63%

“…The nitrate ions (NO 3 − ) and BOD indicator (biochemical oxygen demand that can also be used for determining indirectly the concentration of substances susceptible to biodegradation process) were chosen in the present analysis (Javadi and AL-Najjar [4], Weiss and Cozarelli [12], Joekar-Niasar et al [5]). Basing on the analyzed literature, in the case of nitrate biodegradation, one can rather speak of biological transformation (reaction), treated in a saturated zone mainly as biological denitrifi cation.…”

Section: General Description Of Contaminant Transport In Groundwater mentioning

confidence: 99%

“…More detailed explanations concerning the complex biodegradation process in a natural groundwater along with description of the physical and chemical parameters depending on this process are given by Spitz and Moreno [9], Zheng and Wang [14], Chiang [3], Javadi and AL-Najjar [4], Weiss and Cozzarelli [12], Kraft et al [7], Joekar-Niasar et al [5], Aniszewski [2], Zhang et al [13].…”

Section: General Description Of Contaminant Transport In Groundwater mentioning

confidence: 99%

“…This regularity is related even to the similar (but never the same) contaminants moving in ground media (Spitz and Moreno [9], Chiang [3], Javadi and AL-Najjar [4], Weiss and Cozzarelli [12], Kraft et al [7], Aniszewski [1], Taniguchi and Holman [11], Aniszewski [2]). This is connected, among other things, with negative or positive charging of the solid phase of natural soils (as an "anionic" or "cationic" exchange) (Spitz and Moreno [9], Chiang [3], Javadi and AL-Najjar [4], Weiss and Cozzarelli [12], Kraft et al [7], Taniguchi and Holman [11]). It should also be noted that in various climatic and ground conditions, physico-chemical and biological properties of moving groundwater differ considerably one from another, impacting on all the major processes (parameters) used in the transport models and presented here.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Description and Verification of the Contaminat Transport Models in Groundwater (Theory And Practice)

Aniszewski¹

2013

Archives of Environmental Protection

View full text Add to dashboard Cite

This paper presents a general overview of 2D mathematical models for both the inorganic and the organic contaminants moving in an aquifer, taking into consideration the most important processes that occur in the ground. These processes affect, to a different extent, the concentration reduction values for the contaminants moving in a groundwater. In this analysis, the following processes have been taken into consideration: reversible physical non-linear adsorption, chemical and biological reactions (as biodegradation/biological denitrifi cation) and radioactive decay (for moving radionuclides). Based on these 2D contaminant transport models it has been possible to calculate numerically the dimensionless concentration values with and without all the chosen processes in relation to both the chosen natural site (piezometers) and the chosen contaminants.In this paper, it has also been possible to compare all the numerically calculated concentration values to the measured concentration ones (in the chosen earlier piezometers) in relation to both the new unpublished measurement series of May 1982 and the new set of parameters used in these 2D contaminant transport models (as practical verifi cation of these models).

show abstract

Section: General Description Of Contaminant Transport In Groundwater mentioning

confidence: 63%

Section: General Description Of Contaminant Transport In Groundwater mentioning

confidence: 99%

Section: General Description Of Contaminant Transport In Groundwater mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Description and Verification of the Contaminat Transport Models in Groundwater (Theory And Practice)

Aniszewski¹

2013

Archives of Environmental Protection

View full text Add to dashboard Cite

show abstract

“…(Al-Hamdan & Reddy, 2008;Javadi & Al-Najjar, 2007;Rubin, 1983;Vereda-Alonso et al, 2007). Rate-controlled equilibrium models, which are considered more realistic, include a set of feasible reactions capable to reach the equilibrium in the time scale of the transport process and a parallel solution of the kinetic equations for the slow and/or the irreversible reactions (Koukkari & Pajarre, 2006;Ribeiro et al, 2005;Steyer et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Computing multi-species chemical equilibrium with an algorithm based on the reaction extents

Paz‐Garcia

Johannesson

Ottosen

et al. 2013

Computers & Chemical Engineering

View full text Add to dashboard Cite

-Maroto, J. M. (2013). Computing multi-species chemical equilibrium with an algorithm based on the reaction extents. Computers and Chemical Engineering, 58, 135-143. https://doi.org/10.1016/j.compchemeng.2013 AbstractA mathematical model for the solution of a set of chemical equilibrium equations in a multi-species and multiphase chemical system is described. The computer-aid solution of model is achieved by means of a Newton-Raphson method enhanced with a line-search scheme, which deals with the non-negative constrains. The residual function, representing the distance to the equilibrium, is defined from the chemical potential (or Gibbs energy) of the chemical system. Local minimums are potentially avoided by the prioritization of the aqueous reactions with respect to the heterogeneous reactions. The formation and release of gas bubbles is taken into account in the model, limiting the concentration of volatile aqueous species to a maximum value, given by the gas solubility constant.The reaction extents are used as state variables for the numerical method. As a result, the accepted solution satisfies the charge and mass balance equations and the model is fully compatible with general reactive transport models.

show abstract

A simulation‐optimization model to control seawater intrusion in coastal aquifers using abstraction/recharge wells

Javadi

Abd-Elhamid

Farmani

2011

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Seawater intrusion is one of the most serious environmental problems in many coastal regions all over the world. Mixing a small quantity of seawater with groundwater makes it unsuitable for use and can result in abandonment of aquifers. Therefore, seawater intrusion should be prevented or at least controlled to protect groundwater resources. This paper presents development and application of a simulationoptimization model to control seawater intrusion in coastal aquifers using different management scenarios; abstraction of brackish water, recharge of freshwater, and combination of abstraction and recharge. The model is based on the integration of a genetic algorithm optimisation technique and a coupled transient density-dependent finite element model. The objectives of the management scenarios include determination of the optimal depth, location and abstraction/recharge rates for the wells to minimize the total costs for construction and operation as well as salt concentrations in the aquifer. The developed model is applied to analyze the control of seawater intrusion in a hypothetical confined coastal aquifer. The efficiencies of the three management scenarios are examined and compared. The results show that combination of abstraction and recharge wells is significantly better than using abstraction wells or recharge wells alone as it gives the least cost and least salt concentration in the aquifer. The results from this study would be useful in designing the system of abstraction/recharge wells to control seawater intrusion in coastal aquifers and can be applied in areas where there is a risk of seawater intrusion.

show abstract

Finite element modeling of contaminant transport in soils including the effect of chemical reactions

Cited by 40 publications

References 31 publications

Description and Verification of the Contaminat Transport Models in Groundwater (Theory And Practice)

Description and Verification of the Contaminat Transport Models in Groundwater (Theory And Practice)

Computing multi-species chemical equilibrium with an algorithm based on the reaction extents

A simulation‐optimization model to control seawater intrusion in coastal aquifers using abstraction/recharge wells

Contact Info

Product

Resources

About