Organic fraction of municipal solid waste (OFMSW) is an ideal substrate for biogas production; however, complex chemical structure and being heterogeneous obstruct its biotransformation in anaerobic digestion (AD) process. Thermal pre-treatment of OFMSW has been suggested to enhance the solubilization and improve the anaerobic digestibility of OFMSW. This paper critically and comprehensively reviews the characterization of OFMSW (physical, chemical, bromatological) and enlightens the valuable properties of OFMSW for waste valorization. In following sections, the advantages and limitations of AD of OFMSW are discussed, followed by the application of temperature phased AD, and various thermal pre-treatments, i.e., conventional thermal, microwave, and thermo-chemical for high rate bioenergy transformation. Effects of pre-treatment on COD, proteins, sugars and VS solubilization, and biogas yield are discussed. Formation of recalcitrant during thermal pre-treatment and the effect on anaerobic digestibility are considered. Full scale application, and techno-economic and environmental feasibility of thermal pre-treatment methods are also revealed. This review concluded that thermophilic (55 °C) and temperature phased anaerobic digestion, temperature phased anaerobic digestion, TPAD (55 + 37 °C) processes shows effective and stable performance at low HRTs and high OLRs and achieved higher methane yield than mesophilic digestion. The thermal pre-treatment at a lower temperature (120 °C) improves the net energy yield. However, high-temperature pre-treatment (>150 °C) result in decreased biogas yield and even lower than the non-pre-treated OFMSW, although a high degree of COD solubilization. The OFMSW solubilization in terms of COD, proteins, and sugars cannot accurately reflect thermal/hybrid pre-treatments' potential. Thus, substrate pre-treatment followed by anaerobic digestibility of pretreated substrate together can evaluate the actual effectiveness of thermal pre-treatment of OFMSW.

城市固体废物的有机部分 (OFMSW) 是生产沼气的理想基质；然而，复杂的化学结构和异质性阻碍了其在厌氧消化（AD）过程中的生物转化。已建议对 OFMSW 进行热预处理以提高 OFMSW 的溶解度并提高其厌氧消化率。本文批判性地、全面地回顾了 OFMSW（物理、化学、溴学）的表征，并揭示了 OFMSW 对废物价值化的宝贵特性。在接下来的部分中，讨论了 OFMSW 的 AD 的优点和局限性，然后是温度阶段 AD 的应用，以及各种热预处理，即用于高速生物能源转化的常规热、微波和热化学。预处理对 COD、蛋白质、糖和 VS 增溶，以及沼气产量进行了讨论。考虑了热预处理过程中顽固剂的形成和对厌氧消化率的影响。还揭示了热预处理方法的全面应用以及技术经济和环境可行性。该综述得出结论，高温 (55 °C) 和温度分相厌氧消化、温度分相厌氧消化、TPAD (55 + 37 °C) 工艺在低 HRT 和高 OLR 下表现出有效和稳定的性能，并实现了比中温消化更高的甲烷产量。在较低温度 (120 °C) 下进行的热预处理提高了净能量产率。然而，高温预处理 (>150 °C) 导致沼气产量降低，甚至低于未经预处理的 OFMSW，尽管 COD 溶解度很高。OFMSW 在 COD、蛋白质和糖方面的溶解不能准确反映热/混合预处理的潜力。因此，底物预处理和预处理底物的厌氧消化率一起可以评估 OFMSW 热预处理的实际效果。