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Fate of bioavailable nutrients released to a stream during episodic effluent releases from a municipal wastewater treatment lagoon.
Painter, Kristin J; Brua, Robert B; Spoelstra, John; Koehler, Geoff; Yates, Adam G.
Afiliación
  • Painter KJ; The University of Western Ontario and Canadian Rivers Institute, Department of Geography, 1151 Richmond Street, London, Ontario N6A 5C2, Canada. kpainte3@uwo.ca.
  • Brua RB; Environment and Climate Change Canada, National Hydrology Research Centre, 11 Innovation Boulevard, Saskatoon, Saskatchewan S7N 3H5, Canada.
  • Spoelstra J; Environment and Climate Change Canada, Canada Centre for Inland Waters, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada and Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1, Canada.
  • Koehler G; Environment and Climate Change Canada, National Hydrology Research Centre, 11 Innovation Boulevard, Saskatoon, Saskatchewan S7N 3H5, Canada and NHRC Stable Isotope Laboratory, 11 Innovation Boulevard, Saskatoon, Saskatchewan S7N 3H5, Canada.
  • Yates AG; The University of Western Ontario and Canadian Rivers Institute, Department of Geography, 1151 Richmond Street, London, Ontario N6A 5C2, Canada. kpainte3@uwo.ca.
Environ Sci Process Impacts ; 22(12): 2374-2387, 2020 Dec 16.
Article en En | MEDLINE | ID: mdl-33155593
Municipal wastewater lagoons are common across North America and, unlike larger mechanical wastewater treatment plants, typically release nutrient-rich effluent directly to rivers in intermittent pulses. However, little is known about the fate of nutrients from these episodic events, which may happen under varying hydrologic or thermal conditions. We assessed fate of nitrogen (N) and phosphorus (P) from lagoon effluent during three releases to Deadhorse Creek, Manitoba, Canada. Using net nutrient uptake lengths and natural abundance stable isotope ratios of dissolved inorganic nitrogen (DIN) and primary producers, we found that DIN was processed during the summer releases though the dominant mechanism was unclear. However, nitrate was largely exported in autumn. Primary producers assimilated lagoon N but did not appear to reduce DIN concentrations. The longitudinal pattern of soluble reactive phosphorus (SRP) varied between releases and in summer 2019 the stream became a net source of SRP despite concomitant processing of DIN. We hypothesize that low demand for P in Deadhorse Creek, as suggested by upstream SRP > 0.05 mg P L-1, and nutrient ratios indicative of N limitation, reduced instream processing of P. Furthermore, our results indicated that cool or high flow conditions may result in the export of much of the lagoon nutrient load downstream. Our findings suggest the processes that transform wastewater nutrients are overwhelmed during effluent releases. Managers should consider increasing effluent dilution via continuous release of effluent rather than pulsed delivery. However, management of upstream nutrient supply may also be needed when relying upon the self-purifying capacity of rivers.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Purificación del Agua País/Región como asunto: America do norte Idioma: En Revista: Environ Sci Process Impacts Año: 2020 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Purificación del Agua País/Región como asunto: America do norte Idioma: En Revista: Environ Sci Process Impacts Año: 2020 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido