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Environmental Management

, Volume 64, Issue 4, pp 436–455 | Cite as

Coastal Tourism and Its Influence on Wastewater Nitrogen Loading: A Barrier Island Case Study

  • Michael O’DriscollEmail author
  • Eban Bean
  • Robert N. Mahoney
  • Charles P. HumphreyJr.
Article

Abstract

Package treatment plants (PTPs) are facilities designed to treat onsite wastewater for small communities, commercial, and residential developments. PTPs are being utilized in a growing number of coastal communities. This study estimated the effects of coastal tourism on onsite wastewater nitrogen (N) inputs to a barrier island surficial aquifer (Bogue Banks, NC). The N-removal effectiveness was assessed for seven PTPs that treated wastewater from vacation properties using a range of technologies: extended aeration; sequencing batch reactor; and advanced media filtration. Influent and effluent wastewater samples were collected monthly from Feb. 2014 to Jan. 2015 and analyzed for particulate and dissolved N. Increased summer visitation associated with coastal tourism resulted in an increase in water use, wastewater inputs, and PTP N loading to the surficial aquifer. However, extended aeration systems did not have significantly elevated TN loads during the summer months because their treatment efficiency increased. N inputs associated with coastal tourism made up approximately 51% of the annual wastewater-related N load to the surficial aquifer. Onsite wastewater N-loading to the surficial aquifer (6.7 kg-N/ha/yr) appeared to be the dominant source of N loading on the island. Water quality data indicated that these N inputs have resulted in increased groundwater NO3 concentrations in the surficial aquifer. Overall, wastewater inputs added approximately 4.6 cm of groundwater recharge annually to the island. Coastal tourism can result in measurable increases in wastewater N loading, groundwater nitrogen concentrations, and groundwater recharge.

Keywords

Onsite Nutrient Coastal Water quality Wastewater Package treatment plants Advanced onsite wastewater treatment systems 

Notes

Acknowledgements

The authors thank East Carolina University for providing funding necessary to complete this research. The following are thanked for providing support through logistics and/or material support while this research was conducted: Jim Watson, John Woods, Jonathan Prevatte, Adam Trevisan, Colleen Rochelle, North Carolina Department of Environmental Quality, Bogue Banks Water Corp., Carteret County Health Department (Environmental Health), property owners, and plant operators (particularly Donald O’Mara). We thank Steven Berkowitz at NC Department of Health and Human Services for earlier advice, data sharing, and a thoughtful review. In addition, Guy Iverson provided a review of an earlier draft.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Coastal StudiesEast Carolina UniversityGreenvilleUSA
  2. 2.Agricultural and Biological Engineering Department, Institute of Food and Agricultural SciencesUniversity of FloridaGainesvilleUSA
  3. 3.Environmental Health Division of Union County Public HealthMonroeUSA
  4. 4.Environmental Health Sciences ProgramEast Carolina UniversityGreenvilleUSA

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