S. R. Williams, X. Zhu-Barker, S. Lew, Benjamin James Croze, Kenna R. Fallan, W. Horwath
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引用次数: 8
Abstract
Abstract Windrow composting of green waste as an alternative to green waste disposal in landfills requires an understanding of the impacts on greenhouse gas (GHG) emissions and the development of effective and efficient management strategies to reduce these emissions. The addition of food waste to green waste compost operations is becoming more common, but its effect on GHG emissions is less understood. As more food waste diversion occurs as a result of recent implementation of climate smart policies in California, more information is needed to address the sustainability of composting different combinations of waste types. We monitored GHG emissions from compost windrows comprised of green waste alone and a green/food waste mixture (green waste : food waste = 9:1, by wet weight) at the University of California, Davis Student Farm in 2016 using a modified, open, flow-through chamber technique. When comparing total emissions of nitrous oxide (N2O) and methane (CH4), the green/food waste mixture produced 110 kg CO2 eq./ton DM (dry matter, std error = 12.2), which were slightly lower than emissions produced by the green waste alone (152 kg CO2 eq./ton DM, std error = 15.9). Methane was a large contributor to global warming potential (GWP) of both composting treatments, suggesting that management practices that optimize porosity and air flow in compost piles are promising in reducing emissions from both green waste and green/food waste mixtures.
摘要作为垃圾填埋场绿色废物处理的替代方案,绿色废物的Windrow堆肥需要了解对温室气体(GHG)排放的影响,并制定有效的管理策略来减少这些排放。在绿色垃圾堆肥作业中添加食物垃圾越来越普遍,但其对温室气体排放的影响却鲜为人知。由于加州最近实施了气候智能政策,导致更多的食物垃圾被转移,因此需要更多的信息来解决不同垃圾类型组合堆肥的可持续性问题。2016年,我们在加州大学戴维斯分校学生农场使用改良的开放式流通室技术监测了堆肥堆的温室气体排放,堆肥堆由单独的绿色废物和绿色/食物废物混合物组成(绿色废物:食物废物=9:1,按湿重计)。当比较一氧化二氮(N2O)和甲烷(CH4)的总排放量时,绿色/食物垃圾混合物产生110 kg CO2当量/吨DM(干物质,标准误差=12.2),略低于单独的绿色废物产生的排放量(152 kg CO2当量/吨DM,标准误差=15.9)。甲烷是两种堆肥处理的全球变暖潜力(GWP)的主要因素,这表明优化堆肥堆中孔隙率和空气流动的管理实践有希望减少绿色废物和绿色/食物废物混合物的排放。
期刊介绍:
4 issues per year
Compost Science & Utilization is currently abstracted/indexed in: CABI Agriculture & Environment Abstracts, CSA Biotechnology and Environmental Engineering Abstracts, EBSCOhost Abstracts, Elsevier Compendex and GEOBASE Abstracts, PubMed, ProQuest Science Abstracts, and Thomson Reuters Biological Abstracts and Science Citation Index