ABSTRACT

Mechanical-Biological Treatment (MBT) is a technology applied to reduce the environmental impacts of urban waste based on stabilizing the organic matter content. As the process is not entirely efficient, the residue can generate methane when it is landfilled. Long-term methane emissions estimation based on models is usually over or underestimated because the actual waste composition after stabilization is generally unknown. This work proposes a single tool to improve the emission estimations of the landfilled MBT waste based on the determination of the biomethane potential test (BMP). Experimental BMP of the crude and stabilized organic fractions of municipal solid waste obtained from an MBT plant were carried out, and the results were used to predict the methane emission from two models, LandGEM (2005) and IPCC (2006). In the LandGEM model, the experimental value of BMP represents the methane potential L₀ while in the IPCC model it allowed to obtain the ultimate organic carbon anaerobically degraded (DOC_f), based on a linear correlation (R² = 0.944, p-value < .05) that can be used to obtain the DOC_f in a waste of any composition. The results of the long-term (40 years) methane emissions of the stabilized waste disposed on land showed overestimations of up 56.0% (IPCC model) and 259.5% (Landgem model) when default data, instead the actual DOC_f were applied in stabilized waste; similar behaviour was observed for the crude waste (23.3% and 241.3% overestimations). Moreover, the impact of the stabilization process revealed methane emission reductions of 5.1% and 20.9% based on LandGEM and IPCC models, respectively.

 抽象的

机械生物处理（MBT）是一种在稳定有机物含量的基础上减少城市垃圾对环境影响的技术。由于该过程并不完全有效，残渣在填埋时会产生甲烷。基于模型的长期甲烷排放量估算通常会被高估或低估，因为稳定后的实际废物成分通常是未知的。这项工作提出了一种基于生物甲烷潜力测试 (BMP) 测定的单一工具来改进填埋的 MBT 废物的排放估算。对从 MBT 工厂获得的城市固体废物的粗制和稳定有机部分进行了实验 BMP，结果用于预测 LandGEM（2005 年）和 IPCC（2006 年）这两个模型的甲烷排放量。在LandGEM模型中，BMP的实验值代表甲烷势L ₀ ，而在IPCC模型中，它允许获得基于线性相关性的最终有机碳厌氧降解（DOC _f ）（ R ² = 0.944， p值） < .05)，可用于获取任何成分废物中的 DOC _f 。当默认数据应用于_稳定化废弃物时，陆地上稳定化废弃物的长期（40 年）甲烷排放量结果显示高估了 56.0%（IPCC 模型）和 259.5%（Landgem 模型）。浪费;粗废物也观察到类似的行为（高估了 23.3% 和 241.3%）。此外，根据 LandGEM 和 IPCC 模型，稳定过程的影响显示甲烷排放量分别减少了 5.1% 和 20.9%。