Composting has demonstrated to be an effective and sustainable technology to valorise organic waste in the framework of circular economy, especially for biowaste. Composting can be performed in various technological options, from full-scale plants to community or even individual composters. However, there is scarce scientific information about the potential impact of community composting referred to gaseous emissions. This work examines the emissions of methane and nitrous oxide as main GHG, ammonia, VOC and odours from different active community composting sites placed in Spain, treating kitchen, leftovers and household biowaste. Expectedly, the gaseous emissions have an evident relation with the composting progress, represented mainly by its decrease as temperature or biological activity decreases. GHG and odour emission rates ranged from 5.3 to 815.2 mg CO d kgVS and from 69.8 to 1088.5 ou d kgVS, respectively, generally being lower than those find in open-air full-scale composting. VOC characterization from the community composting gaseous emissions showed a higher VOC families’ distribution in the emissions from initial composting phases, even though terpenes such as limonene, α-pinene and β-pinene were the most abundant VOC along the composting process occurring in the different sites studied. The results presented in this study can be the basis to evaluate systematically and scientifically the numerous current projects for a worldwide community composting implementation in decentralised biowaste management schemes.

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解决分散式生物废物社区堆肥中的气体和气味排放差距

堆肥已被证明是一种有效且可持续的技术，可以在循环经济框架下对有机废物（尤其是生物废物）进行增值。堆肥可以通过各种技术选项进行，从大型工厂到社区甚至个人堆肥器。然而，关于社区堆肥对气体排放的潜在影响的科学信息很少。这项工作检查了西班牙不同活跃社区堆肥场的主要温室气体、氨、挥发性有机化合物和气味的甲烷和一氧化二氮的排放量，这些堆肥场处理厨房、剩菜和家庭生物废物。预计气体排放量与堆肥进度有明显关系，主要表现为随着温度或生物活性的降低而减少。温室气体和气味排放率分别为 5.3 至 815.2 mg CO d kgVS 和 69.8 至 1088.5 ou d kgVS，通常低于露天全规模堆肥中的排放率。社区堆肥气体排放的 VOC 特征显示，尽管柠檬烯、α-蒎烯和 β-蒎烯等萜烯是不同堆肥过程中最丰富的 VOC，但在初始堆肥阶段的排放中，VOC 族分布较高。研究的网站。本研究提出的结果可以作为系统、科学地评估分散式生物废物管理计划中全球社区堆肥实施的众多当前项目的基础。