بررسی روند تغییرات آلودگی ناشی از نفوذ شیرابه محل دفن فرضی در آبخوان رفسنجان

نوع مقاله: مقالات پژوهشی

نویسندگان

1 گروه علوم و مهندسی آب دانشکده کشاورزی دانشگاه بیرجند

2 دانشیار گروه علوم و مهندسی آب دانشکده کشاورزی دانشگاه بیرجند

چکیده

چکیده
زمینه و هدف: در منطقه رفسنجان استان کرمان سایت­هایی برای محل دفن زباله در نظر گرفته شده است، در حالی که نفوذ شیرابه ناشی از وجود محل دفن برای منابع آب زیرزمینی که تنها منبع اصلی تأمین نیاز آبی این منطقه است، تهدید جدی محسوب می­شود. پژوهش حاضر با هدف تعیین روند تغییرات آلودگی ناشی از نفوذ آلاینده­ها از یک لندفیل فرضی بر اساس شرایط زمین­شناسی و هیدروژئولوژیکی دشت رفسنجان برای نشان دادن تأثیر نفوذ شیرابه و انتشار و پخش آلودگی در منابع آب زیرزمینی انجام شد.
مواد و روش­ها:انتقال آلودگی بر اساس تغییرات غلظت در دو نقطه ابتدایی و انتهایی لندفیل توسط مدل MT3DMS به صورت روزانه و برای مدت 22 سال بررسی گردید. غلظت آلودگی 2 و 4g/L و شدت نفوذ آن 1/5 و 3cm بر روز در نظر گرفته شد.
یافته­ها:شیب خط افزایش غلظت در فرآیند انتشار، پخشیدگی با تأخیر در ابتدای لندفیل با غلظت 2 و 4g/L و شدت 1/5cm بر روز به ترتیب در طول 15 و 17 سال روند افزایشی دارد و پس از آن کاهش ­می­یابد. در انتهای لندفیل برای غلظت 2g/L، در 5 سال اول و غلظت 4g/L در 9 سال اول، 90 درصد افزایش غلظت آلودگی اتفاق می­افتد و در سال­های بعد روند ثابتی دارد.
نتیجه­گیری: در فرآیند­های مختلف انتقال پس از نفوذ آلودگی به آبخوان، غلظت آلودگی در ابتدا کم و به مرور زمان افزایش می­یابد و در صورت ثابت بودن غلظت منبع آلاینده و شدت نفوذ ثابت، حداکثر غلظت آلودگی آبخوان در یک مقدار مشخص ثابت می­شود و نوع فرآیند انتقال در زمان رسیدن به این مقدار ثابت تأثیر زیادی دارد؛ به‌طوری‌که در فرآیند انتشار- پخشیدگی به طور متوسط در 5 سال اول این مقدار ثابت می­شود و در حالت با تأخیر پس از نزدیک 22 سال به مقدار ثابت می­رسد.

کلیدواژه‌ها


عنوان مقاله [English]

Studying the Trend of Changes in the Contamination Concentration Caused by Leakage Leachate of Hypothetical Landfill in Rafsanjan Aquifer

نویسندگان [English]

  • Seyed mostafa Tabatabaei 1
  • Ali Shahidi 2
1 Department of Water Science and Engineering, Faculty of Agriculture, University OF Birjand
2 Associate Professor, Department of Water Science and Engineering, Faculty of Agriculture, University of Birjand
چکیده [English]

Abstract
Background & objeftive: In the Rafsanjan region of Kerman province, some sites have been considered for landfill construction. Since groundwater resources are the only source of water supply to provide water requirements in this region, the leachate leakage from landfills into groundwater resources is regarded as a serious threat. The aim of this research is to study the trend of changes in the contamination concentration obtained from leachate leakage in a hypothetical landfill based on the geological and hydrogeological conditions of Rafsanjan plain in order to represent the effect of leachate leakage and contamination spread on groundwater resources.
 
 
Methods and Materials: Transmission of contamination has been studied on the basis of changes in concentration at two initial and final points of landfill by MT3DMS model daily and for 22 years period. The concentration of leachates has been considered 2 and 4 g / l, and its diffusion rate has been assumed 1.5 and 3 cm per day.
 
Results: The slope of the concentration increase in the propagation process and delayed diffusion at the beginning of the landfill with 2 and 4 g/l concentration and 1.5 cm rate during 15 and 17 years have an increasing trend, respectively and later it would have a decreasing trend. At the end of landfill, 90% increase in contamination will occur for 2 g/l concentration in the first five years and 4 g/l concentration in the first 9 years and it will have a fixed trend over the next few years.
Conclusion: In the various transmission processes after the penetration of the infection into the aquifer, the concentration of contamination is initially low and increasing over time and if the concentration of the contamination penetrating source and penetrating intensity are constant, the maximum concentration of aquifer pollution is fixed at a certain value. The type of transmission process has a huge impact on this constant value. So that in the propagation-diffusion process, the average in the first 5 years of this value is fixed and in a delayed state, it reaches a constant value after close to 22 years.

کلیدواژه‌ها [English]

  • Groundwater
  • Diffusion- Dispersion
  • Leachate
  • MT3DMS Model
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