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<p>This study calculates the water environmental capacity and pollution reduction potential in the Nanyi Lake Basin. Water quality status was analyzed using the single-factor index method with monitoring data from 2021 to 2023. Pollutant loads and the contribution of point and non-point sources were quantified using the emission factor method. The water environmental capacity was determined via a one-dimensional model and the control section compliance method. Results show that key pollutants in descending order of severity are total nitrogen (TN), chemical oxygen demand (COD), ammonia nitrogen (NH₃-N), and total phosphorus (TP). The annual pollutant loads entering the river are 8078.19 t COD, 572.14 t NH₃-N, 80.93 t TP, and 844.02 t TN. The calculated environmental capacities for COD are 7914.13 t/a (1D model) and 8186.36 t/a (compliance method); for NH₃-N, 708.26 t/a and 718.39 t/a; and for TP, 169.96 t/a and 170.93 t/a. TN capacity is negative (−263.16 t/a and −251.32 t/a), indicating severe overload. Correlation analysis identifies pH and conductivity as primary influencing factors. Targeted reduction measures are proposed: upgrading urban sewage plants for enhanced nitrogen/organic removal, promoting precision agriculture, and constructing riparian buffers. This study provides empirical support for managing the Nanyi Lake Basin and a reference for similar regions.</p>

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Calculation of water environmental capacity and potential of pollution reduction in Nanyi Lake Basin

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Tao Li,
  • Xuebo Qin,
  • Xiuyuan Liang,
  • Shiyu Huang,
  • Jianhua Xiong,
  • Wenyu Huang

摘要

This study calculates the water environmental capacity and pollution reduction potential in the Nanyi Lake Basin. Water quality status was analyzed using the single-factor index method with monitoring data from 2021 to 2023. Pollutant loads and the contribution of point and non-point sources were quantified using the emission factor method. The water environmental capacity was determined via a one-dimensional model and the control section compliance method. Results show that key pollutants in descending order of severity are total nitrogen (TN), chemical oxygen demand (COD), ammonia nitrogen (NH₃-N), and total phosphorus (TP). The annual pollutant loads entering the river are 8078.19 t COD, 572.14 t NH₃-N, 80.93 t TP, and 844.02 t TN. The calculated environmental capacities for COD are 7914.13 t/a (1D model) and 8186.36 t/a (compliance method); for NH₃-N, 708.26 t/a and 718.39 t/a; and for TP, 169.96 t/a and 170.93 t/a. TN capacity is negative (−263.16 t/a and −251.32 t/a), indicating severe overload. Correlation analysis identifies pH and conductivity as primary influencing factors. Targeted reduction measures are proposed: upgrading urban sewage plants for enhanced nitrogen/organic removal, promoting precision agriculture, and constructing riparian buffers. This study provides empirical support for managing the Nanyi Lake Basin and a reference for similar regions.