Investigation of hydro-geochemical quality of surface water for drinking water use (Case study: Qalikuh region, Lorestan province, southwest of Iran)

Hosseini, Amir Saeed; Hakimi Asyabar, Saeed; Salvati, Mozhgan

doi:10.22034/irqua.2021.702415

Investigation of hydro-geochemical quality of surface water for drinking water use (Case study: Qalikuh region, Lorestan province, southwest of Iran)

Document Type : Original Article

Authors

Amir Saeed Hosseini

Saeed Hakimi Asyabar

Mozhgan Salvati

Department of Geology, Lahijan Branch, Islamic Azad University, Lahijan, Iran

https://doi.org/10.22034/irqua.2021.702415

Abstract

Introduction
Rivers are one of the most important water resources and it is very important to study their water quality. Therefore, in this study, sampling was done from 15 permanent waterway stations of Pirbadush and Gashun of Qolyan River in Lorestan province, which are located in the path of oil shales.

Materials and Methods
Hydro-geochemical parameters were calculated by analyzing the samples in the laboratory. Then compared with drinking water quality assessment standards in the region and Hydro-geochemical diagrams were also drawn.
Discussion and Results: Qolyan River water contains a lot of calcium carbonate and only sample P3 has more magnesium carbonate that it is unsuitable for drinking due to its high calcium content, but it is suitable based on other parameters.

Results
According to Schoeller quality classification, Gashun samples are of lower quality than Pirbadush and by the standards, most samples are within the allowable-favorable range and water of G6, G7, P5 stations have lower quality than other stations. According to the WHO table, the water of the Qolyan River is relatively light in terms of TH and total dissolved solids (TDS) and relatively light in terms of Electrical conductivity (Ec). Based on hydro-chemical tests and data analysis and hardness estimation and comparison with the national standard of Iran and the standard of the World Health Organization, the results of water classification of the samples are as follows: According to the World Health Organization's calcium ion (Ca^{2 +}) content, water samples from G7 and P5 stations are impermissible and based on the total hardness of the Iranian national standard, the water samples of stations P1 and P3 are in the favorable level.
According to hydro-geochemical diagrams, the water quality of Pirbadush waterway is better than Gashun. According to the Piper diagram, In Gashun samples, the tendency of the samples towards magnesium and sulfatation is more than the samples of Pirbadush region. According to the Durov diagram, most of the water samples taken from Gashun and Pirbadush waterways are calcium carbonate (Ca-CO₃) and calcium bicarbonate (Ca-HCO₃). According to Schoeller diagram, the amount of tumble in the samples of Gashun waterway is more than Pirbadush waterway. According to the ion equilibrium diagram, the amplitude of change of anions and cations in Gashun waterway is more than Pirbadush. According to Stiff diagram, the different origins of the samples indicate the existence of several bedrock sources for the samples, and according to the Gibbs diagram, bedrock and weathering and dissolution are the main factors controlling the water chemistry of the region.
By examining the water quality of Qolyan River in Pirbadush and Gashun waterways with any human activity that it is in the path of oil shales, the results were obtained which are:
-The highest amount of cations and carbonate anion (CO₃^2-), is in G7 station and the highest amount of nitrate anion (NO₃^-), are in G6 and P7 stations.
-The highest water total hardness (TH) is related to stations G7, G6, P5 and the lowest is related to stations P3, P1, G1.
-The highest total dissolved solids (TDS) in water is related to stations G6, G5, G7 and the lowest amount is related to P1, P4, P3.
- The presence of higher amount of calcium carbonate (Ca-HCO₃) in Gashun waterway than Pirbadush indicates a higher degree of solubility of calc than dolomite in this section.
- High sulfate content in Gashun waterway (especially G1 station) can be related with further dissolution of anhydrites in the Gotnia Formation.
-Anion and cation equilibrium also shows that ionic equilibrium is present only at stations G3, G5, P6. However, at stations P1 and P3, there is a high degree of ionic imbalance between anions and cations.

Conclusion
In this area, the type of rock units and even the presence of oil shales have not had a detrimental effect on the quality of drinking water.

Keywords

Drinking water

Qolyan River

Qalikuh

Oil shales

Hydro-geochemical diagrams

20.1001.1.24237108.1400.7.1.3.9

Subjects

Natural hazards (paleoseismology, landslides, ..)

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