基于生命周期评价的市政污泥烟气干化环境影响评价及其经济性分析

Environmental impact and technical economics LCA analysis on the drying fof integrative system of the municipal sludge drying by with flue gas by LCA

应用LCA方法和技术经济学的观点对市政污泥烟气干化系统进行环境影响和经济性分析,结果表明,处理1 t湿污泥,对环境的总影响负荷为2 954.392毫人当量,资源耗竭系数为4.265毫人当量,干化污泥掺混发电3 206.08 kWh,污泥烟气干化对环境影响主要为固体废弃物,占50.71%,其次为全球变暖21.84%;各个过程中掺混发电与干化影响为80.56%,污泥运输过程影响最小为0.02%;而对该系统进行投资,其动态投资回收期为3.13年,内部收益率高达53.07%。

The environmental impacts and economic benefits of the integrative system of the municipal sludge drying with flue gas are analyzed by methodologies of LCA and technical economics. The results indicate that when It wet munuicipal sludge is treated, the values of the environmental impacts and resources consumption are 2 954. 392 mPET and 4. 265 mPET, and 3 206.08 kWh electric power is provided. The main environmental impacts of the integrative system of the munieipal sludge drying with flue gas is the solid wastes emission, as 50.71%, second is global warming as 21.84% in the category of environmental impacts;the impact in the process of sludge drying and mixing-power generation is 80.56%, and the impact in the sludge transportation is the least as 0.02% ;when the capital is invested in the system, the dynamic recovery period of investment is 3.13 years and the internal rate of return（IRR） is 53.07%. Obviously, the environmental and economic benefits of the integrative system of the municipal sludge drying with flue gas are very credible.