Phosphorus loading to nearshore waters from legacy septic system groundwater plumes in a Great Lakes coastal community
- Download(s)
- DOI
- Language of the publication
- English
- Date
- 2024-12-02
- Type
- Article
- Author(s)
- Wang, Shuyang
- Robinson, Clare E.
- Spoelstra, John
- Schneidewind, Uwe
- Roy, James W.
- Publisher
- Elsevier
Alternative title
Charge de phosphore dans les eaux littorales provenant des panaches d’eaux souterraines d’anciennes fosses septiques dans une communauté côtière des Grands Lacs
Abstract
High phosphorus (P) loads to the Laurentian Great Lakes contribute to eutrophication, harmful algal blooms, and hypoxia. Groundwater impacted by wastewater effluent from household septic systems, common in coastal communities, is a recognized P source to nearby lakes. However, the long-term impact of neighbourhood-scale septic system decommissioning (i.e., conversion to sewer connections) on this P loading is not well understood or quantified. The objective of this study was to investigate long-term P loading to Nottawasaga Bay from groundwater plumes of decommissioned septic systems in the coastal community of Wasaga Beach. Detailed groundwater sampling characterized a legacy P plume from a septic system decommissioned 35 years ago, revealing elevated soluble reactive phosphorus concentrations extending over 40 m and reaching the shoreline. Sorption and dispersion parameters required for neighbourhood-scale modeling were derived by simulating this persistent, long but thin P plume using a numerical model. Numerical simulations of P plumes from > 800 septic systems, 0.01–1.6 km from the shoreline and active < 65 years before decommissioning, revealed P mass discharge to the lake started after ∼ 30 years and will continue for > 4000 years. Relatedly, the extended P transport meant the annual mass discharge rate to the lake was consistently < 1.3 % of the annual mass input rate from septic systems to the aquifer, though it varied over time according to the septic systems’ distance from shore. These findings highlight the long-term view required in accounting for decommissioned septic systems in P management strategies to protect lake water quality.
Plain language summary
Groundwater impacted by wastewater effluent from household septic systems, common in coastal communities, is a recognized phosphorus (P) source to nearby lakes. However, the long-term impact of neighbourhood-scale septic system decommissioning (i.e., conversion to sewer connections) on this P loading is not well understood or quantified. The objective of this study was to investigate long-term P loading to Nottawasaga Bay from groundwater plumes of decommissioned septic systems in the coastal community of Wasaga Beach. Detailed groundwater sampling characterized a legacy P plume from a septic system decommissioned 35 years ago, revealing elevated soluble reactive phosphorus concentrations extending over 40 m and reaching the shoreline. Sorption and dispersion parameters required for neighbourhood-scale modelling were derived by simulating this persistent, long but thin P plume using a numerical model. Numerical simulations of P plumes from > 800 septic systems, 0.01–1.6 km from the shoreline and active < 65 years before decommissioning, revealed P mass discharge to the lake started after ~30 years and will continue for > 4000 years. Relatedly, the extended P transport meant the annual mass discharge rate to the lake was consistently < 1.3% of the annual mass input rate from septic systems to the aquifer, though it varied over time according to the septic systems’ distance from shore.
Subject
- Surface water,
- Groundwater,
- Waste water
Rights
Pagination
13 pages
Peer review
Yes
Open access level
Gold
Identifiers
- ISSN
-
2773-0719
- 0380-1330
Article
- Journal title
- Journal of Great Lakes Research
- Journal volume
- 50
- Journal issue
- 6
- Article number
- 102453
- Accepted date
- 2024-09-30
- Submitted date
- 2024-07-14