ABSTRACT

Anaerobic digestate (AD), a sub-product of cattle manure treatment to produce biogas, could be used for agricultural purposes after co-composting. The aim of this research was to evaluate in organic horticulture the co-composted AD, obtained using two different aerobic stabilization processes (not aerated and aerated composting), by assessing (i) the energy requirements and the GHG emissions of on-farm co-composting; (ii) the agronomic performance of the co-composted AD, compared to a commercial organic (CF) fertilizer, on fennel, tomato and zucchini crops; (iii) the environmental sustainability of the different analyzed systems, through the energy and the carbon footprint analyses. The AD co-composting was a feasible way to valorize organic wastes by producing organic fertilizers. These fertilizers could substitute the CF, leading to similar production capacity, energetic and carbon efficiencies. In particular, despite the greater carbon stocks generated by CF, the carbon efficiency was higher in co-composted AD than CF for both fennel and tomato cultivation systems. The GHG emission analysis for the agricultural operations indicated that CF treatment determined the highest CO₂ emissions. Therefore, an appropriate management of the fertilization strategies could allow reducing the GHG emissions.

摘要

厌氧消化物 (AD) 是牛粪处理生产沼气的副产品，可在混合堆肥后用于农业目的。本研究的目的是通过评估 (i) 能源需求和农场共堆肥的温室气体排放，评估有机园艺中的共堆肥 AD，使用两种不同的有氧稳定过程（非曝气和曝气堆肥）获得。堆肥；(ii) 与商业有机 (CF) 肥料相比，共堆肥 AD 对茴香、番茄和西葫芦作物的农艺性能；(iii) 通过能源和碳足迹分析，不同分析系统的环境可持续性。AD 共堆肥是一种通过生产有机肥料来使有机废物增值的可行方法。这些肥料可以替代CF，导致类似的生产能力、能量和碳效率。特别是，尽管 CF 产生了更大的碳储量，但对于茴香和番茄栽培系统，共堆肥 AD 的碳效率高于 CF。农业作业的 GHG 排放分析表明，CF 处理确定了最高的 CO₂排放。因此，适当管理施肥策略可以减少温室气体排放。