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
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