Determining the emission rates of volatile organic compounds and modeling their dispersion from the petroleum and chemical storage tanks of the largest oil terminal in the southwest of Iran

Document Type : Original Article


1 Department of Environmental Engineering, Ahvaz branch, Islamic Azad University, Ahvaz, Iran

2 Department of Chemical Engineering, Mahshahr branch, Islamic Azad University, Mahshahr, Iran



This study aimed to investigate the air pollution caused by volatile organic compounds (VOCs) with an emphasis on benzene, toluene, ethylbenzene, and xylene (BTEX). Due to surface evaporation from the storage tanks of the largest petroleum and chemical product terminal in the export port of the southwestern Iran, the field measurements of the emission sources were performed using the TANKs 4.0.9d software, and VOC emission modeling was performed using the PHAST software. Among 36 point sources (32 external floating roof tanks and four internal floating roof tanks), the emission rates of the VOCs of the storage tanks were determined using the TANKs 4.0.9d software in the area of 3.8 km2 during 12 months (March 2017-January 2018). The highest rate of VOC emissions from the tanks was observed in July, with the highest temperature and wind speed in the region. According to the results, the total emission rate of the VOCs from the storage tanks was 881.74 ton/year, and the highest emission rate was observed in the external floating roof tanks (865.7 ton/year; 98.18%). The contribution of the internal floating roof tanks was 16.04 ton/year (1.81%), and the highest and lowest VOC emission rates in the export port were observed in the light naphtha tank No. 67 and jet naphtha storage tank (56.73 and 4.18 ton/year), respectively. In addition, the highest and lowest BTEX emission rates from the storage tanks were observed in the gasoline tank No. 62 and jet naphtha tanks No. 93 and 94 (0.37 and 0.05 ton/year), respectively.


1. Saikomol S, Thepanondh S, Laowagul W. Emission losses and dispersion of volatile organic compounds from tank farm of petroleum refinery complex. J Environ Health Sci Eng 2019; 17(2): 561-70.
2. Ramavandi B, Ahmadi Moghadam M, Shahheidar N, Bighami M. Estimation of volatile organic compounds emission from the fuel storage tanks using TANKS model and its distribution modeling by AERMOD model. J Sabzevar Univ Med Sci 2016; 23(2): 253-60.
3. Howari FM. Evaporation losses and dispersion of volatile organic compounds from tank farms. Environ Monit Assess2015; 187(5): 1-9.
4. Cunningham D. Estimation of VOC Emissions. J Clean Prod 1995; 3(4): 225-8.
5. Ashrafi K, Shafiepour M, Salimian M, Momeni MR. Determination and Dispersion Modeling of VOC Emissions from Liquid Storage Tanks in Asalouyeh Zone. J Environ Stud 2012; 38(63): 57-60.
6. Jackson MM. Organic liquids storage tanks volatile organic compounds (VOCs) emissions dispersion and risk assessment in developing countries: the case of dar-es-salaam city, Tanzania.  Environ Monit Assess 2006; 116(1): 363-82.
7. Agency EP. User's Guide to TANKS, Storage Tank emission calculation software version 4.0, Emission factor and inventory group emissions, monitoring and analysis division, office of Air quality planning and standards U.S. 1999; 1-2.
8. Wei W, Lv Z, Yang G, Cheng S, Li Y, Wang L. VOCs emission rate estimate for complicated industrial area source using an inverse-dispersion calculation method: A case study on a oetroleum refinery in Northern China. Environ Pollut 2016; 218: 681-8.
9. Ding Y, Lu J, Liu Z, Li W, Chen J. Volatile organic compounds in Shihezi, China, during the heating season: pollution characteristics, source apportionment, and health risk assessment. Environ Sci Pollut Res 2020; 27(14): 16439-50.
10. Dumanoglu Y, Kara M, Altiok H, Odabasi M, Elbir T, Bayram A. Spatial and seasonal variation and source apportionment of volatile organic compounds (VOCs) in a heavily industrialized region. Atmos Environ 2014; 98: 168-78.
11. Pandya GH, Gavane AG, Bhanarkar AD, Kondawar Vk. Concentration of volatile organic compounds (VOCs) at an oil refinery. Int J Environ Stud 2006; 63(3): 337-51.
12. Masih A, Lall AS, Taneja A, Singhvi R. Exposure levels and health risk assessment of ambient BTX at urban and rural environments of a terai region of northern India. Environ Pollut 2018; 242: 1678-83.
13. Pirbadali Somarin A, Peyghambarzadeh SM. Hazardous air pollutants emission characteristic and environmental effect of typical petrochemical incinerators. Int J Environ Sci Technol 2020; 17(8): 3771–84.
14. Aklilu YA, Cho S, Zhang Q, Taylor E. Source apportionment of volatile organic compounds measured near a cold heavy oil production area. Atmos Res 2018; 206: 75-86.
15. Allen DT. Emission from oil and gas operation in the United States and their air quality implications. J Air Waste Manag Assoc 2016; 66(6): 549-75.
16. Hoyt D, Raun LH. Measured and estimated benzene and volatile organic carbon (VOC) emissions at a major US refinery/chemical plant: Comparison and prioritization. J Air Waste Manag Assoc 2015; 65(8): 1020-31.
17. Hadidi LA, Aldosary AS, Al-Matar AK, Mudallah OA. An optimization model to improve Gas emission mitigation in Oil refineries. J Clean Prod 2016; 118: 29-36.
18. Zhang Y, Li R, Fu H, Zhou D, Chen J. Observation and analysis of atmospheric Volatile organic compounds in typical petrochemical area in Yantze River Delta, China. J Environ Sci 2018; 71: 233-48.
19. Jiang M, Zou L, Li XQ, Che F, Zhao GH, Li G, Zhang GN. Definition and Control Indicators of Volatile Organic Compounds in China. Environ Sci 2015; 36(9): 3522-32.
20. Marzocca A, Di Gilio A, Farella G, Giua R, De Gennaro G. Indoor Air Quality Assessment and Study of Different VOC Contributions within a School in Taranto City, South of Italy. Environments 2017; 4(1): 23-38.
21. Ting M, Yue-Si W, Jie J, Fang-Kun W, Mingxing W. The Vertical Distributions of VOCs in the Atmosphere of Beijing in Autumn. Sci Total Environ 2008; 390(1): 97-108.
22. Xiong Y, Bari MA, Xing Z, Du K. Ambient volatile organic compounds (VOCs) in two coastal cities in western Canada: Spatiotemporal variation, source apportionment, and health risk assessment. Sci Total Environ 2020; 706: 135970.
23. Cheng S, Zhang J, Wang Y, Zhang D, Teng G, Chang-Chien GP, et al. Global Research Trends in Health Effects of Volatile Organic Compounds during the Last 16 Years: A Bibliometric Analysis. Aerosol Air Qual Res 2019; 19(8): 1834-43.
24. Soni V, Singh P, Shree V, Goel V. Effects of VOCs on human health. Air pollution and control. Singapore 2018; 119-142.
25. Hajizadeh Y, Teiri H, Nazmara S, Parseh I. Environmental and biological monitoring of exposures to VOCs in a petrochemical complex in Iran. Environ Sci Pollut Res 2018; 25(7): 6656-67.
26. Wu XM, Fan ZT, Zhu X, Jung KH, Ohman-Strickland P, Weisel CP, et al. Exposures to volatile organic compounds (VOCs) and associated health risks of socio-economically disadvantaged population in a “hot spot” in Camden, New Jersey. Atmos Environ 2012; 57: 72-9.
27. Zhang Y, Mu Y, Liu J, Mellouki A. Levels, sources and health risks of carbonyls and BTEX in the ambient air of Beijing, China. J Environ Sci 2012; 24(1): 124-30.
28. Miri M, Shendi M R, Ghaffari HR, Aval HE, Ahmadi E, Taban E, et al. Investigation of outdoor BTEX: concentration, variations, sources, spatial distribution, and risk assessment. Chemosphere 2016; 163: 601-9.
29. Kanjanasiranint N, Prueksasit T, Morknoy D, Tunsaringkarn T, Sematong S, Siriwong W, et al. Determination of ambient air concentrations and personal exposure risk levels of outdoor workers to carbonyl compounds and BTEX in the inner city of Bangkok, Thailand. Atmos Pollut Res 2016; 7(2): 268-77.
30. Breton JGC, Breton RMC, Ucan FV, Baeza CB, Fuentes MdILE, Lara ER, et al. Characterization and sources of aromatic hydrocarbons (BTEX) in the atmosphere of two urban sites located in Yucatan Peninsula in Mexico. Atmosphere 2017; 8(6): 107-130.