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Evaluation of eco-efficiency and analysis of its determinants for WWTPs within the Yangtze River Economic Belt
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Jin XU1, *, Zhi-hong ZHENG1, Xing-yu ZHENG2, Xi-lin PENG2, Jie YAO2, Xiao RAN1, Yu-long YANG1, Hong-yu WANG1
China Environmental Science | 2025, 45(8) : 4699 - 4705
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China Environmental Science | 2025, 45(8): 4699-4705
• Environmental Impact Assessment and Management •
Evaluation of eco-efficiency and analysis of its determinants for WWTPs within the Yangtze River Economic Belt
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Jin XU1, *, Zhi-hong ZHENG1, Xing-yu ZHENG2, Xi-lin PENG2, Jie YAO2, Xiao RAN1, Yu-long YANG1, Hong-yu WANG1
Affiliations
  • 1.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing400044, China
  • 2.Chongqing Three Gorges Water Co., Ltd, Chongqing 401123, China
Published: 2025-08-20
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This study employs a dual approach, utilizing both normalized carbon emission equivalents and eco-efficiency indicators based on data envelopment analysis (DEA), to evaluate633WWTPs within the Yangtze River Economic Belt. The mean eco-efficiency index was found to be 0.492. The eco-efficiency of WWTPs in the Yangtze River Economic Belt is significantly influenced by scale effects: mean index are 0.440 for plants with treatment scale ≤10,000m3/d, 0.507 for 10,000~100,000m3/d, and 0.729 for >100,000m3/d; notable differences in eco-efficiency exist across various regions and treatment processes: with sequencing batch reactors and continuously stirred tank reactors exhibit higher mean eco-efficiency index (0.569) than plug-flow processes (0.473). Additionally, as the BOD5 concentration of influent in WWTPs increases, their eco-efficiency index rises but then declines. Moreover, advanced treatment processes exacerbate the environmental impact of wastewater treatment systems, WWTPs meeting Grade A discharge standards have a mean eco-efficiency index of 0.483, compared to 0.535 for Grade B-compliant plants.

wastewater treatment plants  /  Yangtze River Economic Belt  /  eco-efficiency  /  data envelopment analysis
许劲, 郑志宏, 郑星宇, 彭喜林, 姚杰, 冉潇, 杨煜隆, 王虹钰. 长江经济带城镇污水处理厂生态效率评估及其影响因素. 中国环境科学, 2025 , 45 (8) : 4699 -4705 .
Jin XU, Zhi-hong ZHENG, Xing-yu ZHENG, Xi-lin PENG, Jie YAO, Xiao RAN, Yu-long YANG, Hong-yu WANG. Evaluation of eco-efficiency and analysis of its determinants for WWTPs within the Yangtze River Economic Belt[J]. China Environmental Science, 2025 , 45 (8) : 4699 -4705 .
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Year 2025 volume 45 Issue 8
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Article Info
  • Receive Date：2024-12-28
  • Online Date：2026-10-08
  • Published：2025-08-20
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  • Received：2024-12-28
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Affiliations
    1.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing400044, China
    2.Chongqing Three Gorges Water Co., Ltd, Chongqing 401123, China
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表12种不同金属材料的力学参数
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Family		 属数
Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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