Journal of Environmental Health 2014 Abstracts - page 6

treatment. Two sites, however—one in an area of centralized wastewater treatment
apparently near a suspected sewer line leak, and the second in an area of onsite
wastewater treatment—showed effects of wastewater. Organic wastewater compounds
were detected more frequently in samples from these two sites than from the other sites.
Optical brighteners levels were correlated (
r
2
= .88) with the number of organic
wastewater and pharmaceutical compounds detected at the residential sites and could
potentially serve as a screening method to assess wastewater effects on small streams.
Fate and Transport of Phosphate From an Onsite Wastewater System in Beaufort
County, North Carolina
Charles Humphrey, MS, PhD, REHS,
Department of Environmental Health Sciences
,
East Carolina University
Mike O’Driscoll, MS, PhD,
Department of Geological Sciences
,
East Carolina
University
Nancy Deal, MS, REHS,
North Carolina Department of Health and Human Services
David Lindbo, MS, PhD,
North Carolina Cooperative Extension
,
North Carolina State
University
Abstract
The objectives for the study described in this article were to evaluate the fate and
transport of onsite wastewater system (OWS)–derived phosphate from a residential
system in Beaufort County, North Carolina, and to determine if current OWS setback
regulations are sufficient to prevent elevated phosphate discharge to surface waters.
Piezometers were installed in nests at different depths adjacent to drainfield trenches and
up- and down-gradient of a residential OWS. Groundwater and septic effluent phosphate
concentrations, temperature, pH, dissolved oxygen, and electrical conductivity were
monitored every two months from February 2011 to October 2011 (five times). The mean
groundwater phosphate concentration beneath the OWS (3.05 ± 0.74 mg/L) was not
significantly different than septic effluent (2.97 ± 0.76 mg/L) and was elevated relative to
background groundwater (0.14 ± 0.12 mg/L). Groundwater phosphate concentrations
were inversely related (
r
2
= .83) to distance from the system. Onsite system setback
regulations may have to be increased (>30 m) in some areas to ensure groundwater
phosphate concentrations are reduced to background concentrations before discharge to
surface waters.
Place-Based Exposure and Cataract Risk in the Beaver Dam Cohort
Jane A. McElroy, PhD,
University of Missouri–Columbia
Barbara E.K. Klein, PhD,
University of Wisconsin–Madison
Kristine E. Lee, MS,
University of Wisconsin–Madison
Kerri P. Howard, MS,
University of Wisconsin–Madison
Ronald Klein, PhD,
University of Wisconsin–Madison
Abstract
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