Hydrogeological Processes and Chemical Reactions at a Landfill

Ground Water
Mary Jo Baedecker, William Back

Abstract

Chemical and isotopic analyses were made of water from wells in and downgradient from a landfill to determine chemical and isotopic effects of generation and migration of leachate on ground water. The distribution and wide concentration range of oxygen and methane permit the delineation of an anaerobic zone, a regional oxygenated zone and an intermediate zone. The ratio of reduced nitrogen to nitrate indicates location of reducing fronts as the leachate migrates. The pH of the native ground water is low (≥5.0) primarily because of the low pH of rainfall and the lack of calcareous or other soluble minerals in the aquifer material. The pH is higher (∼6.6) in the leachate because of generation of carbon dioxide, ammonia, and methane. The native ground water has a low TDS (80 mg/l) while the leachate has an average TDS of 2800 mg/l and is primarily a NaHCO3 type water. Sulfate concentrations are extremely low and H2 S was not detected. We suggest that a major source of cations may be their exchange from the clays by the ammonium generated in the leachate. High concentrations of Fe and Mn are attributed to a source in the refuse but more important to reduction of oxide cements and coatings resulting from degradation of organic matte...Continue Reading

References

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Citations

Sep 3, 2008·Isotopes in Environmental and Health Studies·Hossein Mohammadzadeh, Ian Clark
Nov 6, 2018·Environmental Science. Processes & Impacts·M P WilsonA Hart
Sep 20, 2007·Environmental Geochemistry and Health·Andrés Navarro, Montserrat Carbonell
Mar 25, 2006·Ground Water·S V PannoD J O'Kelly
Mar 1, 2008·Ground Water·P B McMahon, F H Chapelle
Feb 15, 2011·Ground Water·I M CozzarelliJ B Jaeschke
Feb 5, 2009·Ground Water·Francis H ChapellePeter B McMahon
Jul 30, 2011·Ground Water·Mary P Anderson, John McCray
Feb 13, 2009·Ground Water·Mary Jo Baedecker, Warren W Wood
May 21, 2014·Ground Water·Keith E Schilling, Peter Jacobson
Jun 22, 2002·Environmental Science & Technology·Ethan L GrossmanIsabelle M Cozzarelli
Jun 11, 1982·Science·I J Winograd, F N Robertson
Feb 16, 2010·The Science of the Total Environment·Colin SullivanNigel J D Graham

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