Long-term redox conditions in a landfill-leachate-contaminated groundwater

The Science of the Total Environment
Daniel AbirigaHarald Klempe

Abstract

Indicators of redox conditions; oxygen, sulphate, nitrate, ammonium, iron and manganese, and in addition, bicarbonate and total organic carbon were studied in groundwater samples contaminated by leachate emanating from Revdalen Landfill (Norway). Based on these variables, the study aimed to deduce the redox conditions in the aquifer. Literature on landfill leachate contamination of confined aquifers is scarce and to the best of our knowledge, this study, which describes long-term analysis of redox chemistry, is the first of its kind in such an environment. Groundwater samples were monitored for a period of 24 years, enabling us to describe redox conditions on both short-term and long-term bases. Levels of measured parameters in the contaminated aquifer varied spatially and with time, but were generally elevated except oxygen; pH (4.9-8.8), oxygen (0-11.3 mg/L), sulphate (0-28 mg/L), nitrate (0-16 mg N/L), ammonium (0.02-40 mg/L), iron (0-99 mg/L), manganese (0.06-16 mg/L), bicarbonate (22-616 mg/L) and total organic carbon (1.3-47 mg/L). From the result, levels of iron, manganese, nitrate and ammonium violated the Norwegian drinking water norms. However, iron, ammonium, total organic carbon and bicarbonate showed strong attenua...Continue Reading

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Citations

Jul 23, 2021·Scientific Reports·Daniel AbirigaHarald Klempe

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