Characterization and pollution potential of leachate from urban landfills during dry and wet periods in arid regions

Sajjad Ahmad Siddiqi, Mohamed Almamun*, Ahmad Sana, Mahad Baawain, Mahbuboor Rahman Choudhury

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Leachate originating from municipal solid waste landfills poses a serious contamination threat to public health. The study performed a biophysicochemical
characterization of leachate from two landfills in Oman, i.e., Multaqa landfill leachate (MLL) and Barka landfill leachate (BLL)
before and after rainfall. Samples were characterized for ninety-two (92) parameters. Additionally, the leachate pollution index (LPI) was estimated
to assess. The study found a high value of the leachate parameters without any rainfall incidents. Pearson correlations (+ve) have to
be seen more than 90% in all cases, which is a strong association (r.0.75) for the measured parameters in both MLL and BLL. Rainfall significantly
reduced the concentrations of organic contaminants and solids in leachate due to dilution. The study revealed about 18–29% and
14–28% reductions in the LPI sub-index for organic and inorganic contaminants, respectively, after the rainfall. The overall LPI values were
higher compared to similar findings from the literature. Such deviations could be attributed to the unsegregated nature of solid wastes,
resulting in the formation of contaminants or from the disposal of a high volume of solid wastes in a smaller area. Therefore, the study
recommends efficient management strategies of landfills to reduce potential leachate groundwater contamination.
Original languageEnglish
JournalWater Supply
Publication statusPublished - 2022


  • municipal landfills, landfill management, leachate characterization, leachate pollution index, rainfall effects

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