| چکیده انگلیسی مقاله |
This study evaluates the groundwater quality near the Mohammadabad municipal solid waste landfill in Qazvin, Iran, by examining the physical and chemical parameters of the water. The physicochemical parameters, major ions, and heavy metals in the water were investigated using indices such as the Water Quality Index (WQI). In the wet season, the concentrations of chloride (339.8 mg/L), sulfate (365 mg/L), and sodium (268.7 mg/L), as well as electrical conductivity (EC) with an average of 13035 µS/cm and total dissolved solids (TDS) with an average of 9338.1 mg/L, were significantly higher than the permissible limits of WHO and EPA. In the wet season, the concentrations of some heavy metals such as Pb and Ni exceeded WHO standards, averaging 23.7 µg/L and 49.3 µg/L, respectively. However, in the dry season, metal concentrations decreased, although in the monitoring wells, the average levels of heavy metals in the order of Fe > Zn > Pb > Mn > As > Ni > Hg still exceeded the permissible limits of WHO and EPA. Water Quality Index (WQI) results showed that 27.5% of the samples in the wet season and 8% in the dry season had unsuitable quality for drinking purposes. The stations located near the landfill exhibited the poorest water quality in both seasons. The results from Piper and Gibbs diagrams indicated that the dominant water type in the area is chloro-sulfate, and processes such as evaporation and interaction with evaporitic sediments play a major role in shaping the groundwater chemistry.
|
