بررسی آلودگی آب های زیرزمینی ناشی از نشت شیرابه تولیدی محل دفن پسماندها با استفاده از مدل عددی

نوع مقاله: مقالات پژوهشی

نویسندگان

1 دانشجوی دکتری منابع آب، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران.

2 دانشیار، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران.

3 استادیار، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران.

چکیده

زمینه و هدف: امروزه آلودگی ناشی از محل­های دفن پسماند به عنوان یکی از تهدیدهای جدی محیط زیست و از جمله منابع آب زیرزمینی تلقی می­شود. مطالعه حاضر با هدف استفاده از مدل­های ریاضی و عددی با دقت بالا در تعیین و تشریح شرایط کنونی و انجام پیش­بینی­ های نسبتاً دقیق، به منظور بررسی آلودگی آب­های زیرزمینی اطراف مراکز دفن پسماند ناشی از نشت شیرابه انجام شد.    
مواد و روشها: در این تحقیق برای تخمین سرعت حرکت آلودگی، ردیابی مسیر حرکت و شبیه­سازی فرآیند انتقال آلودگی شیرابه تولیدی در محل لندفیل شهر San Angelo کشور آمریکا به چاه آب شرب پایین­دست، از مدلهای MODFLOW، MODPATH و MT3DMS استفاده شد. همچنین سه سناریوی بهبود بسترسازی کف لندفیل و کاهش میزان نفوذ شیرابه به 25 درصد؛ کاهش میزان استحصال از چاه پایین ­دست به 20 درصد؛ و جابجایی محل دفن پسماند به اندازه m100 به بالادست بررسی شد.
یافته ها: نتایج مدلسازی نشان داد که در شرایط فعلی، شیرابه تولیدی با طی مسافت m 608 در مدت 2158 روز خود را به چاه پایین­دست می­رسد. با اعمال سه سناریو به مدل عددی مشاهده گردید به ترتیب شیرابه با طی 613، 618 و m 667 و مدت زمان 4000، 3250 و 4000 روز خود را به چاه پایین ­دست می­رساند.
نتیجه گیری:در زمینه مکانیابی محل دفن پسماندها و بررسی نشت شیرابه به آب­های زیرزمینی، می­توان با استفاده از مدل­های عددی، مسیر و سرعت حرکت آلودگی را پیش­بینی و تصمیم­ های مدیریتی جهت کاهش زمان و مسافت رسیدن آلودگی به آب­های زیرزمینی اتخاذ نمود.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Groundwater Pollution Caused by Leakage of Leachate Produced Landfill using Numerical Model

نویسندگان [English]

  • Mohsen Azizi 1
  • Abbas Khashei 2
  • Mehdi Dastorani 3
1 PhD, Department of Science and Water Engineering, University of Birjand
2 Associate Professor, Department of Science and Water Engineering, University of Birjand.
3 Assistant Professor, Department of Science and Water Engineering, University of Birjand
چکیده [English]

Background & objective: Today, the pollution caused by landfills is considered as one the serious environmental threats, including groundwater resources. The purpose of this research, the use of mathematical models and numerical with high precision in determining and explaining the current situation and relatively accurate predictions, to examine the groundwater pollution caused by leakage of leachate centers around landfill.
Materials & Methods: In this research, The MODFLOW, MODPATH and MT3DMS models was used to estimate the speed of movement of pollution, tracing path and simulate the process of transfer of leachate producedat San Angelo landfill site in the United States to the downstream drinking water well. Also Three scenarios of a) improved bedding of landfill bottom and reduced leachate penetration to 25%; b) Reducing the amount of extraction downstream drinking water well to 20%; c) landfill Movement as much as 100m to upstream were evaluated.
Results: The results of the modeling showed that in the current situation, the leachate produced landfill reaches the downstream well going through a distance of 608 meters in 2158 days. By applying three scenarios in the numerical model was seen that the leachate reaches to the downstream well by passing a distance of 613, 618, and 667 m in 4000, 3250 and 4000 days, respectively.
Conclusion: Therefore, in the field of locating the landfill and leakage of leachateto groundwater, numerical models can be used to predict the direction and speed of pollution movement and to make management decisions for reducing the time and distance of arriving the pollution at the groundwater.

کلیدواژه‌ها [English]

  • Landfill
  • Groundwater pollution
  • MT3DMS
  • MODPATH
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