农村典型分散式污水处理系统的能值分析--以青岛土壤快速渗滤系统为例

摘要

分散式污水处理系统由于其成本低、效率高、维护方便等特点，成为了我国农村地区典型的污水处理模式。然而，随着可持续发展意识的增强，如何评价系统的可持续性已成为当今研究的一个关键点。在本次研究中，运用能值分析对青岛东庄头土壤快速渗滤系统进行可持续性评价。研究结果表明：该系统的环境负载率及能值可持续指数分别为0.07和242.88。系统的经济净效益的能值当量为2.17 E+18 sej×year–1。通过与其他研究系统的比较分析，该系统的环境负载率较低，可持续性指数较大。该研究揭示了土壤快速渗滤系统中的中水回收利用可以带来良好的经济效益，且环境负荷更小，可持续性更高，因此可以为我国农村污水处理系统的可持续性定量评价提供一定的参考价值。%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 sus-tainable 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 vilage, 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 sys-tems. This result provides a quantitative evaluation of the sustainable development of rural sewage treatment sys-tems in China.