Transport of Indicator Microorganisms from an Onsite Wastewater System to Adjacent Stream
Journal Title: Universal Journal of Environmental Research and Technology - Year 2013, Vol 3, Issue 3
Abstract
The objective of this study was to determine the effectiveness of a residential onsite wastewater treatment system (OWS) in reducing E. coli and enterococci concentrations. Groundwater wells were installed upgradient and downgradient of an OWS. Samples were collected from the septic tank, wells, and adjacent stream 4 times and analyzed for E. coli and enterococci concentrations, and for pH, electrical conductivity, dissolved oxygen and temperature. The OWS reduced E. coli concentrations by more than 99% and enterococci concentrations by 37%. Groundwater downgradient from the OWS had elevated pH, electrical conductivity and microbial concentrations relative to groundwater upgradient from the OWS. The treatment efficiency of the OWS at this site could be enhanced if the drainfield trenches were elevated to provide a thicker vadose zone.
Authors and Affiliations
Harris, J. and Humphrey, C. P. , and O'Driscoll, M. A.
Keywords
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