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Sources And Transport Pathways Of Fecal Bacteria And Pathogens To Aquifers In Rural Bangladesh, Peter S. K. Knappett
Sources And Transport Pathways Of Fecal Bacteria And Pathogens To Aquifers In Rural Bangladesh, Peter S. K. Knappett
Doctoral Dissertations
During the 1980’s millions of households in Bangladesh switched from drinking surface water to private groundwater wells to reduce their exposure to fecal microorganisms. Sadly, this switch to shallow groundwater resulted in the largest example of drinking water poisoning in history, with approximately 100 million people exposed to high concentrations of naturally occurring Arsenic in the groundwater. Spatial distribution of Arsenic in the shallow aquifers tends to be patchy, so the most economical mitigation option has been lateral switching from high Arsenic wells to nearby low Arsenic wells. The recently developed Arsenic flushing conceptual model, which explains the spatial distribution …
Functional Identification Of Microorganisms That Transform Mercury In Marine Sediments, Lisa Romas
Functional Identification Of Microorganisms That Transform Mercury In Marine Sediments, Lisa Romas
Browse all Theses and Dissertations
Monomethylmercury (MMHg) is the toxic form of mercury (Hg) that biomagnifies in food webs, and human exposure to MMHg occurs predominantly via consumption of fish. The primary source of MMHg to the marine environment is thought to be in situ sedimentary production by benthic microorganisms, namely sulfate-reducing bacteria (SRB). I collected sediments from the continental shelf (stations 2 and 6) and slope (station 9) of the NW Atlantic Ocean, and amended them with various inhibitor and promoter solutions to target specific functional groups capable of Hg transformations. I also added stable enriched Hg isotopes to quantify gross Hg methylation and …