Anaerobic digestion (AD) is a well-established process for the treatment of a wide variety of solid organic substrates, including the organic fraction of municipal solid waste (OFMSW). At industrial scale, the mechanical pretreatment is a fundamental step to reduce OFMSW particle size and to promote the hydrolysis within the subsequent AD process. Among the mechanical pretreatment technologies, press-extrusion has recently raised great interest for its possible application to either enhance the organic load to the digester or improve the overall process stability and methane yields. Aim of this study was in assessing the potential of the press-extrusion pretreatment to improve the performance of OFMSW anaerobic degradation. Batch tests were set up according to a full factorial design of experiments to assess the significance of the main operating parameters. The statistical analysis of results addressed further tests, carried out under semi-continuous feeding mode, to better discuss the possible application of press-extrusion for the greatest valorization of OFMSW under anaerobic conditions.

厌氧消化（AD）是一种成熟的工艺，用于处理各种固体有机底物，包括城市固体废物的有机部分（OFMSW）。在工业规模上，机械预处理是减少OFMSW粒径并促进后续AD工艺水解的基本步骤。在机械预处理技术中，压榨技术最近引起了人们的极大兴趣，因为它可能用于提高消化池的有机负荷或改善整个工艺的稳定性和甲烷的收率。这项研究的目的是评估加压挤压预处理改善OFMSW厌氧降解性能的潜力。批处理测试是根据完整的因子设计实验进行的，以评估主要操作参数的重要性。结果的统计分析涉及在半连续进料模式下进行的进一步测试，以更好地讨论在厌氧条件下压榨挤出对OFMSW最大增值的可能应用。