Journal of Resources and Ecology ›› 2016, Vol. 7 ›› Issue (4): 309-316.DOI: 10.5814/j.issn.1674-764x.2016.04.010

Previous Articles    

Emergy Analysis of Typical Decentralized Rural Sewage Treatment System: A Case Study of Soil Rapid Infiltration in Qingdao, China

YANG Ling, KONG Fanlong*, XI Min, LI Yue, ZI Yuanyuan   

  1. College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
  • Received:2016-03-21 Online:2016-07-25 Published:2016-07-25
  • Contact: KONG Fanlong. Tel.: 13608977800
  • Supported by:
    National Natural Science Foundation of China (41101080), the Shandong Natural Science Foundation (ZR2014DQ028 and ZR2015DM004)

Abstract: Decentralized sewage treatment systems are commonly used in rural areas of China because these systems are low cost, easy maintenance and high efficiency. However, as awareness of the importance of sustainable development has increased, questions concerning how to evaluate the sustainability of these systems has become a key point. In this study, emergy analysis is applied to evaluate the soil rapid infiltration for a decentralized rural sewage treatment plant that is located in Dongzhuangtou village, Qingdao, China. The results show that the environmental load ratio and the emergy sustainability index of the system are 0.07 and 242.88, respectively. The net economic benefit is 2.17E+18 sej·year-1 when converted into solar emjoule. Compared to other treatment systems, the environmental load ratio of the system is lower, and the emergy sustainability index is higher. This study reveals the reuse of treated water can produce great economic benefits in the soil rapid infiltration system. The environmental impact of the system is lower, and the sustainability is higher than that of other treatment systems. This result provides a quantitative evaluation of the sustainable development of rural sewage treatment systems in China.

Key words: emergy analysis, Qingdao, soil rapid infiltration, sustainability