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<p>This study aims to assess the multidimensional impacts of reclaimed water replenishment on river water environments. Taking a specific case study of a riverine reclaimed water supply project from a wastewater treatment plant in Ningbo City, the research focuses on developing a scientific method for assessing the environmental effects of reclaimed water input on surrounding river ecosystems. Through comparative analysis of the strengths and limitations of traditional single-factor method and comprehensive pollution index method, this paper proposes an improved assessment method—Entropy-AHP-TOPSIS (IEATM) —which combines entropy weight method and analytic hierarchy process. The conventional assessment methods often employ simplistic linear processing, frequently neglecting the actual characteristics of negative indicators and interval-type indicators. The IEATM effectively distinguishes and optimizes the treatment of negative and interval-type indicators. The results demonstrate that this method offers significant advantages in assessing river ecological health, effectively avoiding evaluation deviations caused by short-term exceedances of individual indicators. Additionally, the IEATM clearly reveals the spatial attenuation patterns and seasonal fluctuation characteristics of the reclaimed water replenishment effects. This provides a crucial theoretical foundation for optimizing reclaimed water replenishment strategies and offers practical guidance for segmented water inflow regulation, ecological wetland construction, and the improvement of river ecological monitoring networks.</p>

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Improved Entropy-AHP-TOPSIS method in comparison to traditional methods for assessing reclaimed water’s impact on river water quality and ecological health

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月5日

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  • Yongxing Qian,
  • Jingran Zhou,
  • Jinxi Chen,
  • Jiwei Chen,
  • Zhiwu Liu,
  • Huixia Jin

摘要

This study aims to assess the multidimensional impacts of reclaimed water replenishment on river water environments. Taking a specific case study of a riverine reclaimed water supply project from a wastewater treatment plant in Ningbo City, the research focuses on developing a scientific method for assessing the environmental effects of reclaimed water input on surrounding river ecosystems. Through comparative analysis of the strengths and limitations of traditional single-factor method and comprehensive pollution index method, this paper proposes an improved assessment method—Entropy-AHP-TOPSIS (IEATM) —which combines entropy weight method and analytic hierarchy process. The conventional assessment methods often employ simplistic linear processing, frequently neglecting the actual characteristics of negative indicators and interval-type indicators. The IEATM effectively distinguishes and optimizes the treatment of negative and interval-type indicators. The results demonstrate that this method offers significant advantages in assessing river ecological health, effectively avoiding evaluation deviations caused by short-term exceedances of individual indicators. Additionally, the IEATM clearly reveals the spatial attenuation patterns and seasonal fluctuation characteristics of the reclaimed water replenishment effects. This provides a crucial theoretical foundation for optimizing reclaimed water replenishment strategies and offers practical guidance for segmented water inflow regulation, ecological wetland construction, and the improvement of river ecological monitoring networks.