State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Waste Manag. 2012 Dec;32(12):2552-60. doi: 10.1016/j.wasman.2012.06.008. Epub 2012 Jul 12.
Determination of the amount of greenhouse gas (GHG) emitted during municipal solid waste incineration (MSWI) is complex because both contributions and savings of GHGs exist in the process. To identify the critical factors influencing GHG emissions from MSWI in China, a GHG accounting model was established and applied to six Chinese cities located in different regions. The results showed that MSWI in most of the cities was the source of GHGs, with emissions of 25-207 kg CO(2)-eq t(-1) rw. Within all process stages, the emission of fossil CO(2) from the combustion of MSW was the main contributor (111-254 kg CO(2)-eq t(-1) rw), while the substitution of electricity reduced the GHG emissions by 150-247 kg CO(2)-eq t(-1) rw. By affecting the fossil carbon content and the lower heating value of the waste, the contents of plastic and food waste in the MSW were the critical factors influencing GHG emissions of MSWI. Decreasing food waste content in MSW by half will significantly reduce the GHG emissions from MSWI, and such a reduction will convert MSWI in Urumqi and Tianjin from GHG sources to GHG sinks. Comparison of the GHG emissions in the six Chinese cities with those in European countries revealed that higher energy recovery efficiency in Europe induced much greater reductions in GHG emissions. Recovering the excess heat after generation of electricity would be a good measure to convert MSWI in all the six cities evaluated herein into sinks of GHGs.
确定城市固体废物焚烧（MSWI）过程中温室气体（GHG）的排放量很复杂，因为在该过程中存在 GHG 的贡献和减排。为了确定影响中国 MSWI 温室气体排放的关键因素，建立了一个 GHG 核算模型，并应用于位于不同地区的六个中国城市。结果表明，大多数城市的 MSWI 是 GHG 的来源，排放量为 25-207kg CO(2)-eq t(-1) rw。在所有过程阶段，MSW 燃烧产生的化石 CO(2)排放是主要贡献者（111-254kg CO(2)-eq t(-1) rw），而电力替代减少了 150-247kg CO(2)-eq t(-1) rw 的 GHG 排放。通过影响化石碳含量和废物的低热值，MSW 中的塑料和食物废物含量是影响 MSWI 温室气体排放的关键因素。将 MSW 中的食物废物含量减半将显著减少 MSWI 的温室气体排放，这种减少将使乌鲁木齐和天津的 MSWI 从 GHG 源转变为 GHG 汇。将这六个中国城市的 GHG 排放量与欧洲国家进行比较表明，欧洲更高的能源回收效率导致 GHG 排放量的大幅减少。回收发电后产生的多余热量将是将评估的六个城市的所有 MSWI 转化为 GHG 汇的一个很好的措施。
