Nonpoint Source Pollution

Islam, Faridul; Lian, Qiyu; Ahmad, Zaki Uddin; Zappi, Mark E.; Yao, Lunguang; Gang, Daniel Dianchen

doi:10.2175/106143017x15131012188033

Cited by 12 publications

(3 citation statements)

References 27 publications

(27 reference statements)

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“…Pollution is introduced into surface water systems through various natural and anthropogenic point and non-point sources (Vega et al, 1998;Yotova et al, 2021). Point sources are single identifiable entities such as wastewater treatment plant effluents (faecal pollution) and factory outlets (chemical pollution) (Islam et al, 2018). Non-point source pollution usually involves large land areas, with transportation of pollutants occurring overland, underground, or even through the atmosphere (USEPA, 2021).…”

Section: Introductionmentioning

confidence: 99%

Industrial and agricultural land uses affected the water quality and shaped the bacterial communities in the inflow rivers of Taihu Lake

Liu,

Lu,

Adriaenssens

et al. 2024

Front. Environ. Sci.

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Taihu Lake is the third-largest freshwater lake in China and is vital as a drinking water source, as well as for irrigation water, flood control, and other functions. Taihu Lake is connected to many inflow rivers, which contribute to the water resource but also to its pollution. Investigating the correlation between water quality, bacterial community structure, and land-use types is essential for pollution control. Yet, few studies have been conducted on all the major inflow rivers of Taihu Lake. This study aimed to assess the bacterial community composition of major inflow rivers of the lake and determine the relationship between the bacterial community, water quality, and land-use. Water samples were collected from ten inflow rivers across four seasons in 2019–2020. DNA extracted from the samples was used for 16S rRNA gene-targeted next-generation sequencing to determine the bacterial community structures. Thirteen physicochemical and microbiological parameters were used to assess the water quality, and the land-use pattern surrounding each sampling location was also profiled. The bacterial community composition demonstrated significant seasonal variation. In summer, the community variation was correlated with chlorophyll a, pH, and phosphate-P, and electric conductivity, nitrate-N, and ammonium-N in winter. Rivers in the northwest were more nutrient-rich than those in the southwest. The industrial, residential, and agricultural land-use categories correlated strongly with the bacterial community composition and water nutrient parameters. Accordingly, farmland drainage, untreated domestic wastewater, and industrial pollution were identified as the major objectives for more effective water quality management in the region.

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Section: Introductionmentioning

confidence: 99%

Industrial and agricultural land uses affected the water quality and shaped the bacterial communities in the inflow rivers of Taihu Lake

Liu,

Lu,

Adriaenssens

et al. 2024

Front. Environ. Sci.

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“…Anthropogenic land use, due to economic development and population growth, influence phosphorus (P) and nitrogen (N) loads to waterbodies through both point and nonpoint sources [3], which can lead to eutrophication of surface water. Point sources of pollution are those which have a direct identifiable source, while nonpoint sources of pollution are those which arrive from various dispersed sources, such as the runoff of soil and sediments, nutrients, and other chemicals from agricultural fields, residential areas, and other lands [4] [5]. Nonpoint sources are difficult to control due to their diffuse nature that can be influenced by weather conditions [4].…”

Section: Introductionmentioning

confidence: 99%

Identifying Nonpoint Sources of Phosphorus and Nitrogen: A Case Study of Pollution That Enters a Freshwater Wetland (Laguna Cartagena, Puerto Rico)

Sánchez-Colón¹,

Schaffner²

2021

JWARP

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Point and nonpoint sources of phosphorus (P) and nitrogen (N) can cause reductions in water quality, including eutrophication. Nonpoint pollution represents a special challenge because of dispersed not easily identifiable sources such as the runoff from soil, nutrients, and other chemicals from agricultural fields and residential areas. Laguna Cartagena is a tropical freshwater wetland, situated in southwestern Puerto Rico. It is a eutrophic ecosystem, and its eutrophication is caused by both external nutrient loading and internal, mainly by phosphorus. This wetland has been affected by phosphorus loading from inorganic agricultural fertilizer in this historically oligotrophic wetland system until the end of subsidized fertilizer use and sugar cane cultivation in the late 1990s. This study identifies: 1) nonpoint sources of phosphorus (SRP, Soluble Reactive Phosphorus and TP, Total Phosphorus) and nitrogen (nitrate, nitrite, and ammonia) that enter Laguna Cartagena; and 2) the role of precipitation events on the contributions of phosphorus and nitrogen loading to ecosystems. Herein we assess water samples from five channelized external sources of P and N that enter Laguna Cartagena at two-week intervals from October 2013 through November 2014. Rainfall data were obtained weekly from a rain gauge. Standard methods were used for all chemical analyses. Results showed that the channelized waterways that carry water to the lagoon can be classified as hypereutrophic (>100 µg/L) for TP concentrations and oligotrophic (<200 µg/L) for nitrogen concentrations. Currently agriculture (rice and cattle) is the predominant land use at the nearby University of Puerto Rico (UPR) Lajas Agricultural Experiment Substation, the predominant nonpoint source of nutrient pollution (SRP, TP and ammonia) in the How to cite this paper: Sánchez-Colón,

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“…Point source pollution is relatively easy to adjust and control because it is easy to monitor their concentration and flux 14 . Conversely, non-point sources often come from extensive areas of land and can be transported overland, underground, or even through the atmosphere to receiving water bodies 15 , making them difficult to measure and control. Non-point source pollution, mainly nitrogen (N) and phosphorus (P), has led to excessive nutrient inputs and surface water quality decline.…”

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confidence: 99%

Water quality attribution and simulation of non-point source pollution load flux in the Hulan River basin

Liu

Cui

et al. 2020

Sci Rep

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Surface water is the main source of irrigation and drinking water for rural communities by the Hulan River basin, an important grain-producing region in northeastern China. Understanding the spatial and temporal distribution of water quality and its driving forces is critical for sustainable development and the protection of water resources in the basin. Following sample collection and testing, the spatial distribution and driving forces of water quality were investigated using cluster analysis, hydrochemical feature partitioning, and Gibbs diagrams. The results demonstrated that the surface waters of the Hulan River Basin tend to be medium-weakly alkaline with a low degree of mineralization and water-rock interaction. Changes in topography and land use, confluence, application of pesticides and fertilizers, and the development of tourism were found to be important driving forces affecting the water quality of the basin. Non-point source pollution load fluxes of nitrogen (N) and phosphorus (P) were simulated using the Soil Water and Assessment Tool. The simulation demonstrated that the non-point source pollution loading is low upstream and increases downstream. The distributions of N and P loading varied throughout the basin. The findings of this study provide information regarding the spatial distribution of water quality in the region and present a scientific basis for future pollution control.

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Nonpoint Source Pollution

Cited by 12 publications

References 27 publications

Industrial and agricultural land uses affected the water quality and shaped the bacterial communities in the inflow rivers of Taihu Lake

Industrial and agricultural land uses affected the water quality and shaped the bacterial communities in the inflow rivers of Taihu Lake

Identifying Nonpoint Sources of Phosphorus and Nitrogen: A Case Study of Pollution That Enters a Freshwater Wetland (Laguna Cartagena, Puerto Rico)

Water quality attribution and simulation of non-point source pollution load flux in the Hulan River basin

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