湖州市餐厨垃圾产沼气发电生命周期评价

Life cycle assessment of biogas power generation from kitchenwaste in Huzhou City

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%。

In order to realize the resource utilization of kitchen waste,the gas production performance of kitchen waste in Huzhou City was investigated through experiments.The life cycle assessment(LCA)method was used to analyze the environmental impact of biogas power generation from kitchen waste and thermal power generation in Huzhou City.The results show that kitchen waste has good gas production performance,with a gas production of 0.92 L/day.Adding appropriate proportion of sludge can promote gas production.When the ratio of kitchen waste to sludge is 9∶1,gas production peak of the system will be arrived 3~4 days in advance.Compared with thermal power generation,biogas power generation has higher environmental impact potential.The environmental impact potential ranked from high to low is acidification potential(AP),global warming potential(GWP),human health potential(HTP),and eutrophication potential(EP).The environmental emission reduction capacity of acidification is 93.26%higher than that of thermal power generation.