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Nutrient retention efficiency in streams receiving inputs from wastewater treatment plants
Eugènia Marti1, Jordi Aumatell, Lluís Godé
1Laboratori d'Enginyeria Química i Ambiental, Facultat de Ciències, Universitat de Girona, Campus Montilivi, s/n, 17071 Girona, Spain. eugenia@ceab.csic.es
Journal of Environmental Quality
|February 18, 2004
Summary
Wastewater treatment plant (WWTP) nutrient inputs can overwhelm stream ecosystems, reducing their ability to retain nutrients. High nutrient loads from WWTPs significantly impair stream nutrient removal efficiency.
Area of Science:
- Environmental Science
- Ecology
- Hydrology
Background:
- Wastewater treatment plants (WWTPs) are significant sources of nutrient inputs into aquatic ecosystems.
- Stream ecosystems play a crucial role in nutrient cycling and retention.
- Understanding the impact of anthropogenic nutrient loading on stream function is vital for water resource management.
Purpose of the Study:
- To investigate the effect of nutrient inputs from WWTPs on stream nutrient retention efficiency.
- To examine longitudinal patterns of nutrient concentrations downstream of WWTP effluents.
- To test the hypothesis that high nutrient loadings reduce stream nutrient retention efficiency.
Main Methods:
- Studied 15 streams in Catalonia, Spain, downstream of WWTP effluents.
- Analyzed longitudinal patterns of ammonium, nitrate, and phosphate concentrations.
- Calculated nutrient uptake length as an indicator of retention efficiency for streams showing nutrient declines.
Main Results:
- No significant decline in dissolved inorganic nitrogen (DIN) or phosphate concentrations was observed in 40% and 45% of streams, respectively.
- Uptake lengths for DIN ranged from 0.14 to 29 km, and for phosphate from 0.14 to 14 km.
- These uptake lengths were longer than those in non-polluted streams, indicating lower retention efficiency.
Conclusions:
- High nutrient loads from WWTPs saturate stream communities, leading to reduced nutrient retention efficiency.
- Stream ecosystems have limitations in nutrient removal capacity when subjected to significant anthropogenic inputs.
- The quantity and quality of WWTP effluent significantly alter the functional capacity of receiving stream ecosystems.