Hydrogeochemical impacts of the Gaborone landfill on its surrounding subsurface environments

Yvonne Bogatsu, Eliot Atekwana, Georges-Ivo Ekosse, Estella Atekwana, Otlogetswe Totolo

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A hyrogeochemical study is currently being undertaken to assess the impact of the Gaborone landfill on its surrounding surface and subsurface water resources. Soil and granitic saprolite were analysed for their minerals content. Surface and subsurface water samples were analysed for water quality indicators, dissolved inorganic carbon (DIC) concentration and δ¹³ CDIC . Geophysical investigations employing electromagnetic and electrical resistivity techniques were conducted in order to delineate the presence of any leachate emanating from the landfill. There are observed changes in water chemistry in the environment, which could be accounted for by the weathering of aquifer minerals being enhanced by carbonic and organic acids presumably from the landfill and sewage ponds. Moreover, two major contaminant plumes were identified as well as several smaller ones. Further research is needed to fully characterise the plumes in order to assess the landfill's full impact on the environment.
Original languageEnglish
Number of pages6
JournalBotswana Notes and Records
Publication statusPublished - Jan 1 2000


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