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Related Concept Videos

Quality of Water01:19

Quality of Water

504
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
504
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Watershed Planning within a Quantitative Scenario Analysis Framework
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From source to stream: CEC source identification and quantification in the Changle River Watershed.

Meixian Cao1, Dan Qin2, Xin Liao1

  • 1State Key Laboratory of Advanced Environmental Technology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Journal of Hazardous Materials
|October 7, 2025
PubMed
Summary
This summary is machine-generated.

Contaminants of emerging concern (CECs) are widespread in the Changle River, primarily from untreated sewage and swine wastewater. Understanding these sources is crucial for managing ecological and health risks in freshwater systems.

Keywords:
Anthropogenic sourceIndicatorsPeri-urban watershedPositive matrix factorization (PMF)Source apportionment

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Area of Science:

  • Environmental Chemistry
  • Water Quality Assessment
  • Ecotoxicology

Background:

  • Contaminants of emerging concern (CECs), such as pharmaceuticals, personal care products (PPCPs), and endocrine-disrupting chemicals (EDCs), pose ecological risks in freshwater systems.
  • The spatial distribution and origins of CECs in river networks are not well understood, hindering effective management.

Purpose of the Study:

  • To investigate the spatial characteristics and source contributions of CECs in the Changle River watershed.
  • To develop and apply an integrated framework for CEC source apportionment.

Main Methods:

  • Coupling of spatial statistics, multivariate statistical analyses, and a receptor model.
  • Analysis of CEC concentrations in river water across different seasons (wet and dry).
  • Identification of pollution hotspots and primary pollutant sources.

Main Results:

  • Widespread CEC contamination was observed in both the main channel and tributaries, with higher concentrations in the dry season.
  • Untreated sewage (37.6%) and swine wastewater (39.5%) were identified as the dominant sources of CECs.
  • Wastewater treatment plant (WWTP) effluents contributed minimally (9.77%) to the overall CEC load.

Conclusions:

  • CEC contamination in the Changle River is driven by a complex mix of point and non-point sources, with significant contributions from untreated domestic and agricultural wastewater.
  • Effective watershed management requires targeted source control strategies to mitigate ecological and human health risks associated with CECs.