期刊
MARINE POLLUTION BULLETIN
卷 170, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2021.112669
关键词
Coastal exports; Nutrients; Terrestrial fluxes; Wastewater; Point and non-point sources; Recycling; Climate change
资金
- NOAA [NA15NOS4780186, NA18NOS4780174]
- California Ocean Protection Council [C0100400]
- South Orange County Wastewater Authority
- Encina Wastewater Authority
- Orange County Sanitation District
- Coastal Commission
- State Water Regional Control Board through the Southern California Bight Regional Monitoring Program
Time series were compiled for terrestrial nitrogen, phosphorus, carbon, iron, and silica fluxes to the Southern California Bight. The study found that point source discharges are the dominant nitrogen source, with wastewater treatment upgrades reducing organic nitrogen loads and inorganic nitrogen loads holding constant.
Time series were compiled of terrestrial nitrogen, phosphorus, carbon, iron, and silica fluxes to the Southern California Bight (SCB), a U.S. West Coast embayment (Sutula et al., 2021). Monitoring data and model output were used to construct a baseline of inputs from direct point source (PS) discharges of wastewater treatment (WWT) effluent (via ocean outfalls) and PS, non-point and natural sources from coastal rivers. The baseline covers 1971-2017 for large WWT plants discharging >50 million gallons per day (MGD) and 1997-2017 for small WWT plants and rivers. PS are the dominant nitrogen source, with contributions of 70% of the total annual freshwater discharge and 95% of nitrogen loads. WWT upgrades have reduced organic nitrogen loads by 73% since 1971. Inorganic nitrogen loads have generally held constant (35-40 Gg y-1) for the large WWT plants. This baseline represents a period prior to extensive wastewater and stormwater recycling that is increasing in the region.
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