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Article

Research on the Non-Point Source Pollution Characteristics of Important Drinking Water Sources

by 1,†, 2,†, 3, 1, 2,* and 1,*
1
College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an 271018, China
2
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
3
Hydrological Center of Tai’an City, Tai’an 271001, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Qiang Fu, Yongqiang Cao, Tianxiao Li and Mo Li
Water 2022, 14(2), 211; https://doi.org/10.3390/w14020211
Received: 14 December 2021 / Revised: 2 January 2022 / Accepted: 7 January 2022 / Published: 12 January 2022
(This article belongs to the Special Issue Water and Soil Resources Management in Agricultural Areas)
In recent years, freshwater resource contamination by non-point source pollution has become particularly prominent in China. To control non-point source (NPS) pollution, it is important to estimate NPS pollution exports, identify sources of pollution, and analyze the pollution characteristics. As such, in this study, we established the modified export coefficient model based on rainfall and terrain to investigate the pollution sources and characteristics of non-point source total nitrogen (TN) and total phosphorus (TP) throughout the Huangqian Reservoir watershed—which serves as an important potable water source for the main tributary of the lower Yellow River. The results showed that: (1) In 2018, the non-point source total nitrogen (TN) and total phosphorus (TP) loads in the Huangqian Reservoir basin were 707.09 t and 114.42 t, respectively. The contribution ratios to TN export were, from high to low, rural life (33.58%), farmland (32.68%), other land use types (20.08%), and livestock and poultry breeding (13.67%). The contribution ratios to TP export were, from high to low, rural life (61.19%), livestock and poultry breeding (21.65%), farmland (12.79%), and other land use types (4.38%). The non-point source pollution primarily originated from the rural life of the water source protection zone. (2) Non-point source TN and TP pollution loads and load intensities showed significantly different spatial distribution patterns throughout the water source protection area. Specifically, their load intensities and loads were the largest in the second-class protected zone, which is the key source area of non-point source pollution. (3) When considering whether to invest in agricultural land fertilizer control or rural domestic sewage, waste, and livestock manure pollution control, the latter is demonstrably more effective. Thus, in addition to putting low-grade control on agricultural fertilizer loss, to rapidly and effectively improve potable water quality, non-point source pollution should, to a larger extent, also be controlled through measures such as establishing household biogas digesters, introducing village sewage treatment plants, and improving the recovery rate of rural domestic garbage. The research results discussed herein provide a theoretical basis for formulating a reasonable and effective protection plan for the Huangqian Reservoir water source and can potentially be used to do the same for other similar freshwater resources. View Full-Text
Keywords: drinking water source; total nitrogen; total phosphorus; non-point source pollution; temporal and spatial distribution; control plan drinking water source; total nitrogen; total phosphorus; non-point source pollution; temporal and spatial distribution; control plan
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MDPI and ACS Style

Hou, L.; Zhou, Z.; Wang, R.; Li, J.; Dong, F.; Liu, J. Research on the Non-Point Source Pollution Characteristics of Important Drinking Water Sources. Water 2022, 14, 211. https://doi.org/10.3390/w14020211

AMA Style

Hou L, Zhou Z, Wang R, Li J, Dong F, Liu J. Research on the Non-Point Source Pollution Characteristics of Important Drinking Water Sources. Water. 2022; 14(2):211. https://doi.org/10.3390/w14020211

Chicago/Turabian Style

Hou, Lei, Zhongyuan Zhou, Ruyan Wang, Jianxin Li, Fei Dong, and Jingqiang Liu. 2022. "Research on the Non-Point Source Pollution Characteristics of Important Drinking Water Sources" Water 14, no. 2: 211. https://doi.org/10.3390/w14020211

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