ارائه مدل ریاضی مستقل از پارامترهای محیطی در فرایند حذف آلودگی خاک به‌‌روش گیاه پالایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد و عضو هیئت علمی دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران

2 استاد دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران

3 دانشجوی کارشناسی ارشد دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران

چکیده

در این مقاله یک مدل ریاضی سه قسمتی برای حذف آلودگی خاک به‌روش گیاه پالایی بر اساس میزان رشد و مرگ ریشه در سیستم ارائه شد. متغیرهای این مدل بر اساس قسمت‌هایی با حجم متفاوتند که هر یک ضریب تجزیه مشخص و از درجه اول دارند. زمانی که ریشه در خاک حرکت می‌کند، خاک در سیکل لایه‌های نزدیک به ریشه (ریزوسفر)، ناحیه مرگ ریشه و ناحیه خاک قرار می‌گیرد. لذا با این که در این مدل، آلودگی بی‌حرکت و ثابت در نظر گرفته می‌شود ولی با توجه به این که ریشه در خاک نفوذ می‌کند، خاک در معرض ریزوسفر قرار می‌گیرد. در این مدل برای بیان چگونگی رشد ریشه، مدلی در نظر گرفته شد که هم رشد مکانی یعنی تغییرات نمایی با عمق و هم رشد زمانی یعنی تغییرات سینوسی با زمان را شامل می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

A Mathematical Model Independent of Environmental Parameters for soil Pollution Removal by Phytoremediation

نویسندگان [English]

  • Parivash Moslehi Moslehabadi 1
  • Manoochehr Vosoughi 2
  • Morteza Ghadirian 3
1 M.Sc. Faculty Member of Chem. and Petroleum Eng. Dept., Sharif University of Tech., Tehran
2 Prof. of Chem. and Petroleum Eng. Dept., Sharif University of Tech., Tehran
3 M.Sc. Student of Chem. and Petroleum Eng. Dept., Sharif University of Tech., Tehran
چکیده [English]

In this paper, a three-zone mathematical model is developed for soil pollutant removal by phytoremediation which is based on the root growth and decay in the system. The variables of the model are based on parts which have different volumes and a given first order decay coefficient. When the root moves in the soil, soil lies in the cycles of layers near the root (rhizosphere), root decay zone, and soil zone. It follows then that despite the fact that the model is based on the assumption of immobile pollutant, the fact that root moves in the soil ensures that soil meets the rhizosphere. To account for the root growth, a model is developed that involves both its spatial growth (exponential variation with depth) and its temporal growth (sinusoidal variation with time).
 
 

کلیدواژه‌ها [English]

  • Pollutant Removal
  • Phytoremediation
  • Rhizosphere
  • mathematical model
1- Hatzinger, P.B., Alexaner, M., Kelsey, J., Kottler, B., and Name, K. (1997). “Sequestration and realistic risk from toxic chemicals remaining after bioremediation.” Annals New York  Academy of Science, 829, 1-5
2- Bossent, I., and Barntha, R. (1984). “The fate of petroleum in soil ecosystems.” Petroleum Microbiology, 1(2), 435-473.
3- April, W., and Sims, R. C. (1990). “Evaluation of the use of prairie grasses for stimulating polycyclic aromatic hydrocarbon treatment in soil.” Chemosphere, 20(1-2), 253-265.
4- Schnour, J.L., and Licht, L.A. (1995). “Phytoremediation of organic and nutrient contaminants.” Environmental Science and Technology, 29(7), 318-323.
5- Shump, J. F., and Tracy, J.C. (1993). “Beneficial effects of plants in the remediation of soil and groundwater contaminated with organic material.” Critical Reviews in Environmental Science and Technology, 23(1), 41-77.
6- Zamyadi, A., Liaghat, A. M., and Hassanoghli, A. R. (2004). “Investigation into the possibility of phytoremidiation of industrial wastewater containing zinc.” J. of Water and Wastewater, 48, 3-12.
(In Persian)
7- Anderson, T.A., Guthrie, E.A., and Walton, B.T. (1993). “Bioremediation in the rhizosphere.” Environmental Science and Technology, 27(13), 2630-2636.
8- Atlas, R. M., and Bartha, R. (1993). Microbial ecology: Fundamentals and applications, Benjamin/Cummings, Publishing Company Inc., Don Mills, SON.
9- Bulan, N., and Adrino, D. (2001). “Rhizosphere the twilight zone of the hidden hall.” Contaminated Soil Sediment Water, 11-13.
10- Hassanoghil,  A., Liaghat, A., and Mirabzadeh, M. (2002). “Effect of water reuse on organic matter concentration of soil and its self purification.” J. of Water and Wastewater, 42, 2-11. (In Persian)
11- Briggs, G.G., Bromilow, R. H., and Evans, A.A. (1982). “Relationships between lipophilicity and root uptake and translocation of non-ionised chemical by banley.” Pesticide Science, 13, 495-504.
12- Paterson, S., Mackay, D., and Mc Farlane, C. (1994). “A model of organic chemical uptake by plants from soil and atmosphere.” Environmental Science and Technology, 28(13), 2259-2266.
13- Zhang, Q., Davis, L. C., and Erickson, L. E. (2001). “Phytoremediation on methyl-tert-buthyl ether (MTBE) in groundwater- experimental of and modeling studies.” Environmental Sience and Technology, (35), 725-731.
14- Pirazizi, A. A. (2002). “Process of environmental models in developing countries.” J. of Water and Wastewater, 41, 57-63. (In Persian)
15- Chang, Y. M., and Carapciuglu, Y. (1998). “Plant- enhanced subsurface bioremediation of nonvolatile hydrocarbons.” J. of Environmental Engineering, 2, 162-164.
16- Eissenstat, G., and Yanai, A. (1997). “Ecology of root lifespan.” Advanced in Ecological Research, 27, 1-60.
17- White, P. L., Thoma, G. J., and Reynolds, M. (2003). “Influence of organic and inorganic soil amendments on plant growth in crude oil- contaminated soil.” Implication J. of Phytoremiditation, 5, 281-292.
18- Anderson, T.A., and Guthie, E.A. (1993). “Bioremediation in the rhizosphere.” Environmental Science and Technology, 27(13), 2630-2636.
19- Dormaar, J. F., and Willms, W.D. (1993). “Decomposition of blue grama and rough fescue root in prairie soils.” J. Range Management, 46, 207-213.
20- Ezzatian, R. (2008). “Laboratory research and mathematical modeling for purification of oily polluted soils by phtoremidiation with using native plants.” Ph.D. Thesis, College of Environmental, Sciences and Research Branch, Azad University, Tehran. (In Persian)