College of Biological and Agricultural Engineering, Jilin University, Changchun, 130022, China.
The Electron Microscopy Center, Jilin University, Changchun, 130000, China.
Environ Sci Pollut Res Int. 2021 Apr;28(15):19412-19423. doi: 10.1007/s11356-020-12172-2. Epub 2021 Jan 4.
The acceptance of combined pre-composting and vermicomposting systems is increasing because of the advantage in rapidly stabilizing organic wastes and reducing emission of greenhouse gasses (GHG). However, GHG emission during the pre-composting phase is often neglected when evaluating the system. This study aimed to quantify GHG emission from a combined pre-composting and vermicomposting system and to investigate the effects of earthworms on GHG emission. A combined system using Eisenia fetida was employed to stabilize maize stover and cow dung (mixing ratio 60:40). The inoculating densities were 60 (T), 120 (T), and 180 (T) earthworms per kilogram of substrate. A traditional composting system without earthworms was set as a control (T). The results indicated that earthworms increased CO while decreased CH and NO emissions compared to the control. Higher emission of CO suggested that the earthworms promoted the degradation of the substrates. Lower emission of CH and NO showed the advantage of the combined system because CH and NO possess extremely higher global warming potential than that of CO. T is recommended for stabilizing maize stover and cow dung when making a tradeoff between stabilization rate and reduction of GHG. The percentages of GHG emission during pre-composting relative to total GHG emission in T, T, and T were 34%, 35%, and 30%, respectively. GHG emission is non-negligible when using a combined system, especially the emission of GHG during the pre-composting phase cannot be ignored.
由于在快速稳定有机废物和减少温室气体（GHG）排放方面的优势，组合预堆肥和蚯蚓堆肥系统的应用正在增加。然而，在评估该系统时，往往忽略了预堆肥阶段的 GHG 排放。本研究旨在量化组合预堆肥和蚯蚓堆肥系统的 GHG 排放，并研究蚯蚓对 GHG 排放的影响。使用赤子爱胜蚓（Eisenia fetida）稳定玉米秸秆和牛粪（混合比为 60:40）的组合系统。接种密度分别为 60（T）、120（T）和 180（T）条/千克底物。不使用蚯蚓的传统堆肥系统作为对照（T）。结果表明，与对照相比，蚯蚓增加了 CO 的排放，而减少了 CH 和 NO 的排放。CO 排放增加表明蚯蚓促进了基质的降解。CH 和 NO 排放减少表明组合系统具有优势，因为 CH 和 NO 的全球变暖潜势远高于 CO。在稳定化速率和减少 GHG 排放之间进行权衡时，T 推荐用于稳定玉米秸秆和牛粪。T、T 和 T 中预堆肥阶段的 GHG 排放占总 GHG 排放的百分比分别为 34%、35%和 30%。使用组合系统时，GHG 排放不容忽视，尤其是预堆肥阶段的 GHG 排放不可忽视。
