Southern California Coastal Water Research Project, CA, United States of America.
Southern California Coastal Water Research Project, CA, United States of America.
Mar Pollut Bull. 2021 Sep;170:112669. doi: 10.1016/j.marpolbul.2021.112669. Epub 2021 Jul 1.
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) for the large WWT plants. This baseline represents a period prior to extensive wastewater and stormwater recycling that is increasing in the region.
时间序列由向南加利福尼亚湾（SCB），美国西海岸的一个海湾（Sutula 等人，2021）输送的陆地氮、磷、碳、铁和硅通量组成。监测数据和模型输出被用来构建一个基线，包括来自污水处理（WWT）废水直接点源（PS）排放的输入，以及 PS、非点源和沿海河流的自然源。基线涵盖了 1971 年至 2017 年期间每天排放超过 5000 万加仑（MGD）的大型 WWT 工厂，以及 1997 年至 2017 年期间的小型 WWT 工厂和河流。PS 是主要的氮源，占总年度淡水排放量的 70%和氮负荷的 95%。自 1971 年以来，WWT 升级减少了 73%的有机氮负荷。对于大型 WWT 工厂，无机氮负荷通常保持不变（35-40 克/年）。这个基线代表了该地区正在增加的广泛废水和雨水回收之前的一个时期。
