Modeling of nitrate pollution in Asadabad alluvial aquifer and evaluation of vulnerability

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OROJI B.; MORTAZAVI S.; Fallah Karimi Z.; OROJI A.

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Journal: IRANIAN WATER RESEARCH JOURNAL Year:2019 | Volume:13 | Issue:1 (32) Page(s): 105-113

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Title

Modeling of nitrate pollution in Asadabad alluvial aquifer and evaluation of vulnerability

Author(s)

OROJI B. | MORTAZAVI S. | Fallah Karimi Z. | OROJI A. | Issue Writer Certificate

Keywords

Absorptive wellQ1

Asadabad aquiferQ1

GroundwaterQ1

ModelingQ1

NitrateQ2

Abstract

Recently, Nitrate concentration in water resources has become an environmental problem of widespread concern. Mainly, high Nitrate concentration is attributed to anthropogenic activities, such as the discharge of urban, rural and industrial sewage, and the excessive use of animal and chemical fertilizers in agriculture. In this work, a model was built to simulate large-scale migration of Nitrate in water resources. Simulating and recognizing Nitrate migration leads to control and reduce the negative environmental effects of Nitrate leakage and its contamination. In this study, the amount of Nitrate entering into the Groundwater of Asadabad Plain was estimated. Asadabad is located in 47° 47' to 48° 16' E and 34° 35' to 34° 52' N, Hamedan province, Iran. The mean elevation from sea levels is 165m. In this plain, Groundwater reservoir is the main source of drinking water. Therefore, analyzing Nitrate in Groundwater is critical. Geological and hydrological data of the plain and especially the areas of absorption wells were gathered and used in MATLAB software for Modeling. Then, in order to achieve the estimation, characteristics of the soil in the time zone were taken into account. Simplifying the model, it was assumed that there wasn’ t any entrance of Nitrate from surface runoff in to the wells. Due to informal questioning from city residents, the wells depth in the region was normally between 5 to 10 meters. Thus the wells depth was considered as 6 meters for Modeling. According to the basic data from region, 5 people were defined as well users and 0. 005 cubic meters per square meters as well inflow for each day. The soil texture was mostly silty and loam with the hydraulic conductivity of 6. 93 meter per day. Also, infiltration rate was considered as 0. 01 meter per day. The amount of and retardation coefficient determined as 1, which indicated high mobility of Nitrate in the soil. The discharge rate of Groundwater was considered as 0. 0015 cubic meter per square meter per day. According to researches and data from the region, average nitrogen excretion per capita was 7. 9-12. 5 gr per day. A hybrid Modeling approach was used to investigate the effect of Nitrate produced from pit toilets and entered into the Groundwater. This comprised an analytical solution for steady-state reactive transport through the unsaturated (or vadose) zone, which was then used as the input to a Groundwater mixing model. To do this, the distance between the Groundwater level and the bottom of the wells was calculated as an average of 40 meters. According to lack of accurate data of Nitrate decay rate in soil and in order to better cover the results, the half-life of Nitrate was considered as 500, 1000 and 1500 days. Hence, considering the distance from bottom of wells to the Groundwater level and different time intervals (from 12 months to more than 50 years) and three half-lives, various amounts of Nitrate concentration were calculated The results indicated the high probability of Nitrate pollution at the Groundwater level are higher than the global health standard for drinking around wells, over a period of 50 years, with a medium to long half-life. Considering the Groundwater feed rate as 0. 0015 cubic meters per square meter and the hydraulic gradient as 0. 015 and the half-life of Nitrate 500, 1000 and 1500 days, passing less than 50 years, the Nitrate content in 18 meters depth will be 200 milligrams per liter, . Also, at a distance of about 40 meters from the Groundwater level, the concentration of Nitrate will reach 115 mg/L. At the same time, with a half-life of 1, 500 days, this amount will reach about 398 mg/L, and in just five years Nitrate levels will pass through this global standard. The results showed that after a short period of 50 years, for an aquifer located 40 meters from the floor of an Absorptive well, the probability of increasing the concentration of Nitrate for drinking water is to a level above the WHO. An approach such as frequent drainage of wells, accurate location, and distance from the aquifer level as well as well-positioned changes can reduce the penetration of Nitrate into Groundwater. Of course, the implementation of these approaches will be limited due to technical and social considerations as well as economic ones.

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APA: Copy

OROJI, B., MORTAZAVI, S., Fallah Karimi, Z., & OROJI, A.. (2019). Modeling of nitrate pollution in Asadabad alluvial aquifer and evaluation of vulnerability. IRANIAN WATER RESEARCH JOURNAL, 13(1 (32) ), 105-113. SID. https://sid.ir/paper/159808/en

Vancouver: Copy

OROJI B., MORTAZAVI S., Fallah Karimi Z., OROJI A.. Modeling of nitrate pollution in Asadabad alluvial aquifer and evaluation of vulnerability. IRANIAN WATER RESEARCH JOURNAL[Internet]. 2019;13(1 (32) ):105-113. Available from: https://sid.ir/paper/159808/en

IEEE: Copy

B. OROJI, S. MORTAZAVI, Z. Fallah Karimi, and A. OROJI, “Modeling of nitrate pollution in Asadabad alluvial aquifer and evaluation of vulnerability,” IRANIAN WATER RESEARCH JOURNAL, vol. 13, no. 1 (32) , pp. 105–113, 2019, [Online]. Available: https://sid.ir/paper/159808/en

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