PMID: 11916049Mar 28, 2002Paper

The spatial variability of nitrogen and phosphorus concentration in a sand aquifer influenced by onsite sewage treatment and disposal systems: a case study on St. George Island, Florida

Environmental Pollution
D Reide CorbetGeoff Schaefer

Abstract

Groundwater from a shallow freshwater lens on St. George Island, a barrier island located in the Panhandle of Florida, eventually discharges into Apalachicola Bay or the Gulf of Mexico. Nutrient concentrations in groundwaters were monitored downfield from three onsite sewage treatment and disposal systems (OSTDS) on the island. Estimates of natural groundwater nutrient concentrations were obtained from an adjacent uninhabited island. Silicate, which was significantly higher in the imported drinking water relative to the surficial aquifer on St. George Island (12.2+/-1.9 mg Si l(-1) and 2.9+/-0.2 mg Si l(-1), respectively), was used as a natural conservative tracer. Our observations showed that nitrogen concentrations were attenuated to a greater extent than that of phosphorus relative to the conservative tracer. At the current setback distance (23 m), both nitrogen and phosphate concentrations are still elevated above natural levels by as much as 2 and 7 times, respectively. Increasing the setback distance to 50 m and raising the drainfields 1 m above the ground surface could reduce nutrient levels to natural concentrations (1.1+/-0.1 mg N l(-1), 0.20+/-0.02 mg P l(-1)).

Citations

Jun 16, 2012·Journal of Environmental Management·Mohammad BadruzzamanJoseph G Jacangelo
Aug 30, 2008·Water Research·Michael O RivettChrystina D Bemment
Feb 13, 2007·Journal of Contaminant Hydrology·Claudette SpiteriPhilippe Van Cappellen
Mar 8, 2019·Ground Water·William D Robertson, Dorothy L Garda
Aug 25, 2019·Environmental Management·Michael O'DriscollCharles P Humphrey
Mar 31, 2009·Journal of Environmental Quality·S Agyin-BirikorangJ C Capece
Sep 22, 2019·The Science of the Total Environment·William D RobertsonSherry L Schiff
Dec 1, 2009·The Science of the Total Environment·I P HolmanM Rivas-Casado

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