垃圾处理的能值分析

采用能值分析方法，对处理垃圾的几种常见方式进行了分析，并对其系统的能值投资率(EIR)和能值产出率(EYR)进行了计算．结果表明，填埋及沼气发电、焚烧发电的EYR稍大于1，堆肥系统的EYR小于1．填埋及沼气发电、焚烧发电虽然显示出一定的应用前景，但它们的EYR还偏小，这说明目前我国垃圾处理系统的运行还离不开政府的支持与新技术的应用．堆肥系统的EYR较小，但由于它的EIR也较低，可以以较低的社会能值投入达到垃圾处理的目的，因此目前暂时也有它存在的价值．

Emergy Analysis in Waste Disposal

Several common methods for waste disposal were analyzed by the emergy theory and the corresponding EIR (Emergy Investment Ratio) and EYR (Emergy Yield Ratio) were calculated. The results indicate that the EYR of the electric power generation from waste landfill gas and from the combustion of waste is slightly greater than 1, while the EYR from composting is less than 1. Although the former is a little promising, the EYR is still low. This is why the appli cation of these methods needs the support from government and the application of new technologies in our country at pr esent. The latter, despite relatively low EYR, was used for waste disposal in the past, and is still used at the present time due to the low EIR.