Journal of Research in Environmental Health

Journal of Research in Environmental Health

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

Document Type : Research article

Authors
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
10.22038/jreh.2018.30254.1206
Abstract
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.
Keywords
Groundwater
Diffusion- Dispersion
Leachate
MT3DMS Model
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