Numerical Modeling of Petroleum Contaminants Transported in Groundwater Probable Leakage from Khoy Oil Storage Tanks, West Azarbaijan, Iran

Subject Areas : environmental management

Abdorreza Vaezihir ¹ , Vahideh Azizan ²

1 - Associated Prof, Faculty of Natural Science, University of Tabriz, Tabriz, Iran. * (Corresponding Author)
2 - MSc. in Hydrogeology, Faculty of Natural Science, University of Tabriz, Tabriz, Iran.

Received: 2015-11-15 Accepted : 2016-06-08 Published : 2019-04-21

Keywords: BTEX, MTBE, Khoy, MT3DMS, MODFLOW-2000,

Abstract :

Background and Objective: In this research concentration and extent of soluble contaminants plumes caused by probable leakage of petroleum materials from Khoy Oil Products Storages and also transporting mechanism of pollutants by groundwater was investigated. Method: Groundwater flow model for a steady and transient state was simulated using MODFLOW-2000 code. Then, flow model calibrated and the aquifer hydraulic parameters were estimated. Flow model output and calibrated parameters were used for simulation of BTEX and MTBE transported by MT3DMS code. Three scenarios were considered to predict transporting of pollutants under various conditions. Findings: The model results suggest that the plume MTBE in the condition of continuous source will be distributed up to 774 meters whereas it will distribute about 108m far from the source if the leakage stops after three years. According to the model prediction, the extension of BTEX will be less than MTBE in the case of continuous leakage. Under condition of the second scenario (non-continuous release of the pollutants) the plume extension of benzene reach will be 126 meter after 10 years and it can reach to the nearest abstraction well in 8.5 years. MTBE plume size in this period reaches to 6 times of BTEX and will reach the well in 1.5 year. Discussion and Conclusion: Average velocity of contaminant distribution is about 5 to 6 cm per day. It is predicted that the MTBE plume reaches earlier to the first pumping wells related to BTEX. So maintenance of the Oil tanks and monitoring of the downstream groundwater is a necessity. Average velocity of contaminant distribution is about 5 to 6 cm per day. It is predicted that the MTBE plume reaches earlier to the first pumping wells related to BTEX. So maintenance of the Oil tanks and monitoring of the downstream groundwater is a necessity.  

References:

1. 1.Vaezihir A., Zare M., Raeisi E., 2010, Numerical simulation of BTEX released from six LNAPL mounds into alluvial aquifer, 15th congress institute of Iran Geology, Kharazmi University, Tehran – Iran (In Persian).


2. Vaezihir A., Zare M., Raeisi E., Molson J., Barker J., 2010, Optimization in selection of suitable method for remediation of BTEX from a pollutant alluvial aquifer by oil material, 15th congress of Iranian Geology Association, Tarbiyat Moallem University, Tehran – Iran (In Persian).  


3. Azizan V., Vaezihir A., 2014, Evaluation of behavior of Benzene pollutant plume released into Groundwater from Khoy oil storage tanks yard, West Azerbaijan, Iran, Iranian Geology Association, Tarbiyat Modares University, Tehran – Iran (In Persian).   


4. National Center for Environmental Assessment, Office of Research and Development, Washington, DC.


5. WHO, 2008 World Health organization. “Guidelines for drinking water quality”, third edition. 515pp.


6. EPA, 2009 U.S. Environmental Protection Agency. Integrated Risk Information System (IRIS) on BTEX.


7. Nikpey A., Mortazavi S. B., Asiliyan H., Khavanin A., Rezaei A., Soleimanian A., 2005, Catalytic hydrolysis of methyl tertiary butyl ether (MTBE) in groundwaters, Journal of Iranian chemistry and chemistry engineering research (In Persian).  


8. Zhang, Ch. and Wang, P.Patrick. 1999. “MT3DMS”, U.S. Army Corps of Engineers Washington, DC 20314-1000.


9. Yazdandoust P., Samani N., 2013, Vulnerability of Zargan plain related to Benzene and Formalin contaminants, 32th congress and the first international seminar of Earth Science, 2013, Geology Survey and Mineral Exploration of Iran, Tehran (In Persian). 


10. Molson, J.W., Barker, J.F., Frind, E.A. 2000. Simulation of natural attenuation and ethanol-induced benzene persistence in gasoline-contaminated aquifer. Proceeding of the Groundwater Quality 2001 Conference held at Sheffield. UK. June 2001. No.275.


11. Omidkhah M., Pourabdollah K., Chegini M., Mantegiyan M., 2007, Determination of MTBE concentration and designing permeability model into Grandwaters of Tehran plain, Journal of Iranian chemistry and chemistry engineering research (In Persian).  


12. Myrttinen, A., Boving, T., Kolditz, O. 2008. Modeling of an MTBE plume at Pascoag. Rhode Island. Journal of Springer. 57:1197-1206.


13. West Azerbaijan regional water management company, 2014, Abstract Reports of Khoy plain climatic condition (In Persian). 


14. Jalali, L., 2011, Investigation of quantity and quality of groundwater resources of Khoy plain aquifer, A MSc thesis in University of Tabriz (In Persian).


15. Todd, D.K. and Mays. 2005. Groundwater Hydrogeology. Third Edition. John Wiley and Sons.


16. Molson J., 2010. A 3D Model for Groundwater Flow, and Multi-Component NAPL Dissolution with Dissolved-Phase Advective-Dispersive Transport and Biodegradation User Guide, University of Waterloo, Canada.