School of Environment Science &Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, HangZhou 310012, China; Instrumental Analysis Center of Zhejiang Gongshang University, Hangzhou 310018, China.
Huadong Engineering Corporation Limited of Power China, Hangzhou 311122, China.
Bioresour Technol. 2021 Apr;325:124706. doi: 10.1016/j.biortech.2021.124706. Epub 2021 Jan 15.
This study examined the environmental impacts and energy consumption of three solid digestate treatment scenarios to quantify their impacts on the entire food waste (FW)-based biogas system: (1) incineration; (2) composting, and; (3) landfill. The results showed that composting had the largest net energy consumption, but least total environmental impact of 57.3 kWh and 8.75 E-03, respectively, whereas landfill showed the opposite pattern. Moreover, there were significant differences (p < 0.05) and relatively high contributions between the digestate treatment subunits among the three scenarios. The most significant contributions of digestate subunits in methods 1-3 to the 100-year global warming potential (GWP) were 70.5%, 52.5%, and 103.4%, respectively. The results indicated that solid digestate treatment had a significant impact, and reasonable disposal of solid digestate could significantly reduce the environmental impacts and energy consumption of the entire FW-based biogas system.
本研究考察了三种固体消化物处理方案的环境影响和能源消耗，以量化它们对整个基于食物垃圾（FW）的沼气系统的影响：（1）焚烧；（2）堆肥；（3）填埋。结果表明，堆肥的净能源消耗最大，但总环境影响最小，分别为 57.3 kWh 和 8.75 E-03；而填埋则相反。此外，在这三种方案中，消化物处理亚单位之间存在显著差异（p < 0.05）和相对较高的贡献。方法 1-3 中消化物亚单位对 100 年全球变暖潜能（GWP）的最大贡献分别为 70.5%、52.5%和 103.4%。结果表明，固体消化物处理有重大影响，合理处置固体消化物可以显著降低整个基于 FW 的沼气系统的环境影响和能源消耗。
