Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 565694
Title Improvement in municipal wastewater treatment alters lake nitrogen to phosphorus ratios in populated regions
Author(s) Tong, Yindong; Wang, Mengzhu; Peñuelas, Josep; Liu, Xueyan; Paerl, Hans W.; Elser, James J.; Sardans, Jordi; Couture, Raoul Marie; Larssen, Thorjørn; Hu, Hongying; Dong, Xin; He, Wei; Zhang, Wei; Wang, Xuejun; Zhang, Yang; Liu, Yi; Zeng, Siyu; Kong, Xiangzhen; Janssen, Annette B.G.; Lin, Yan
Source Proceedings of the National Academy of Sciences of the United States of America 117 (2020)21. - ISSN 0027-8424
DOI https://doi.org/10.1073/pnas.1920759117
Department(s) Water Systems and Global Change
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2020
Keyword(s) Anthropogenic source - Aquatic ecosystem - Nutrient balance - Wastewater treatment - Water quality change
Abstract

Large-scale and rapid improvement in wastewater treatment is common practice in developing countries, yet this influence on nutrient regimes in receiving waterbodies is rarely examined at broad spatial and temporal scales. Here, we present a study linking decadal nutrient monitoring data in lakes with the corresponding estimates of five major anthropogenic nutrient discharges in their surrounding watersheds over time. Within a continuous monitoring dataset covering the period 2008 to 2017, we find that due to different rates of change in TN and TP concentrations, 24 of 46 lakes, mostly located in China's populated regions, showed increasing TN/TP mass ratios; only 3 lakes showed a decrease. Quantitative relationships between in-lake nutrient concentrations (and their ratios) and anthropogenic nutrient discharges in the surrounding watersheds indicate that increase of lake TN/TP ratios is associated with the rapid improvement in municipal wastewater treatment. Due to the higher removal efficiency of TP compared with TN, TN/TP mass ratios in total municipal wastewater discharge have continued to increase from a median of 10.7 (95% confidence interval, 7.6 to 15.1) in 2008 to 17.7 (95% confidence interval, 13.2 to 27.2) in 2017. Improving municipal wastewater collection and treatment worldwide is an important target within the 17 sustainable development goals set by the United Nations. Given potential ecological impacts on biodiversity and ecosystem function of altered nutrient ratios in wastewater discharge, our results suggest that long-term strategies for domestic wastewater management should not merely focus on total reductions of nutrient discharges but also consider their stoichiometric balance.

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