湖州市餐厨垃圾产沼气发电生命周期评价

为实现餐厨垃圾资源化利用,通过实验探究了湖州市餐厨垃圾的产气性能,采用生命周期评价(LCA)方法分析了湖州市餐厨垃圾产沼气发电和火力发电的环境影响。结果表明:餐厨垃圾具有良好的产气性能,产气量为0.92 L/天;添加适当比例的污泥可促进产气,当餐厨垃圾与污泥比为9∶1时,体系产气高峰期可提前3~4天;与火力发电相比,沼气发电具有更高的环境影响潜力值;环境影响潜值由高到低依次为酸化(AP)、全球变暖(GWP)、人体健康(HTP)、富营养化(EP),酸化的环境减排能力比火力发电高93.26%。

湖州市餐厨垃圾产沼气发电能值分析

为实现餐厨垃圾资源化利用,依托湖州市餐厨垃圾产气试点项目,采用能值分析方法分析了湖州市餐厨垃圾产沼气发电和火力发电的环境影响。结果表明:基于能值分析方法,列出两种发电模式的能值输入输出表,并选取了五个能值指标进行计算分析,其中,餐厨垃圾生产沼气进行发电的能值转换率约占到传统火力发电的十分之一,环境负载率(ELR)低于火力发电的81.52%,可再生指数(PR)高于火力发电的75%,能值产出率(EYR)和环境可持续性指数(ESI)也都高于火力发电。

The Possibilities of Bioenergy Production from Whey

The wastes and the by-products of food industrial technologies are suitable for bioenergy generating because of the high organic matter content. Anaerobic digestion is the eldest technology for waste stabilization and however by controlled decomposition a high value and marketable energy source can be produced. Whey is normally used as a component of dairy products or as an additive for food product. In our work we focused on another utilization method： biogas generating from membrane separated fractions i.e.： permeate and concentrate of whey. The effect of the pH, thermal, microwave pre-treatment and their combinations on the biogas yield were investigated. Our results showed that the applied pre-treatments had significant effect on biogas production. In consequence of the hydrolysis of large molecules the biodegradability of the pre-treated whey fractions was enhanced, therefore the biogas and methane production yield increased significantly.