Benefit evaluation on rainwater harvesting system based on emergy analysis

ZHAO Yuxuan; YU Jingyu; LIU Peigui; WANG Zongsheng

doi:10.13205/j.hjgc.202501014

Volume 43 Issue 1

Mar. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(1): 125-134

ZHAO Yuxuan, YU Jingyu, LIU Peigui, WANG Zongsheng. Benefit evaluation on rainwater harvesting system based on emergy analysis[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 125-134. doi: 10.13205/j.hjgc.202501014

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ZHAO Yuxuan, YU Jingyu, LIU Peigui, WANG Zongsheng. Benefit evaluation on rainwater harvesting system based on emergy analysis[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 125-134. doi: 10.13205/j.hjgc.202501014

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Benefit evaluation on rainwater harvesting system based on emergy analysis

doi: 10.13205/j.hjgc.202501014

1. Logistics Management Integrated Office, Xuancheng Campus, Hefei University of Technology, Xuancheng 242000, China;
2. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China

Received Date: 2023-05-16
Accepted Date: 2023-12-14
Rev Recd Date: 2023-10-16

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

Abstract

In order to improve urban waterlogging, rain flood damage, and scarce water resources, China pays more and more attention to collecting and utilizing rainwater, and actively promotes the concept of "sponge city". For giving full play to the effect of rainwater harvesting systems and measuring their value, this study aimed to establish the evaluation model of the comprehensive benefits of rainwater harvesting systems by adopting emergy analysis method. The method quantifies the input and output of material flow, energy flow and monetary flow into solar energy value through emergy conversion technology. Taking a typical office building as a comprehensive case study, this paper calculated the basic value indexes of the three stages of the total collection life cycle, including construction phase, operation phase and scrap and demolition phase. This paper selected the emergy evaluation indexes of ecological environment, economy and society to calculate the results. Thus, the results of emergy evaluation indexes were calculated by the formula, the benefit output of the system was analyzed, and the results were evaluated. The results showed that the emergy input of the rainwater harvesting system was 2.45E+18sej. Remarkably, the emergy output reached an impressive level of 5.61E+18sej, which was much larger than the input energy. This striking disparity fully demonstrated that the output emergy far exceeded the input emergy, underscoring the system’s remarkable effectiveness and efficiency. The system has demonstrated significant output benefits across multiple dimensions, including economic performance, social benefits, and ecological environmental protection. Among them, the ecological environment benefits accounted for 92.90%, especially in biodiversity protection, annual runoff pollution removal and water supply. During the operation phase, the emergy/environment sustainability index (ESI) of the system was 0.8256, showing the system’s sustainable development ability. A high ESI value indicated that the system pursued economic benefits while fully considering environmental protection and social responsibility. This comprehensive benefit evaluation method based on emergy value analysis can evaluate the benefits of rainwater harvesting systems in the construction and operation phase from the perspective of resource flow, and provide a reference for the evaluation of urban rainwater harvesting and utilization systems.
- emergy analysis,
- rainwater harvesting system,
- benefit evaluation,
- rainwater utilization

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References(29)

References

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