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Are the Water Quality Improvement Measures of China’s South-to-North Water Diversion Project Effective? A Case Study of Xuzhou Section in the East Route

Author

Listed:
  • Ye Pan

    (Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China)

  • Yuan Yuan

    (Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China)

  • Ting Sun

    (Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China)

  • Yuxin Wang

    (Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China)

  • Yujing Xie

    (Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China)

  • Zhengqiu Fan

    (Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China)

Abstract

Xuzhou is the hub city of the east route of China’s South-to-North Water Diversion (SNWD) project and implemented dozens of measures to ensure the water quality security of the water transmission line. In order to detect the effectiveness of water quality improvement measures, the monthly water quality data of five water quality parameters from 2005 to 2015 of six state-controlled monitoring sites in Xuzhou section were selected for analysis. The results showed that the water quality improved from 2.95 in 2005 to 2.74 in 2015, as assessed by the comprehensive water quality identification index (CWQII), and basically reached the Class III standards of China’s Environmental Quality Standard for Surface Water (GB3838-2002) from 2011 to 2015. The trend analysis showed that the decline of ammonia nitrogen (NH 3 -N) was the most obvious among the five water quality parameters. However, the concentrations of phosphorus (TP) showed significant upward trends at three sites. The positive abrupt change of time series of water quality occurred in 2009–2011. The identification of influencing factors of water quality changes by multivariate statistical methods found that the urbanization factor accompanied by a decrease in agricultural nonpoint source pollution emissions and the enhancement of wastewater treatment capacity, the closure of factories with substandard emissions and precipitation were the major influencing factors of most water quality parameters, which confirmed the effectiveness of measures for water quality improvement in Xuzhou.

Suggested Citation

  • Ye Pan & Yuan Yuan & Ting Sun & Yuxin Wang & Yujing Xie & Zhengqiu Fan, 2020. "Are the Water Quality Improvement Measures of China’s South-to-North Water Diversion Project Effective? A Case Study of Xuzhou Section in the East Route," IJERPH, MDPI, vol. 17(17), pages 1-21, September.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:17:p:6388-:d:407638
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    References listed on IDEAS

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