Hydrothermal carbonization (HTC) was evaluated as a promising treatment to enhance the biomethane potential during anaerobic digestion (AD) of the organic fraction of municipal solid waste (OFMSW). The OFMSW was carbonized at different conditions and HTC products were tested for biomethane potential into AD. Results proved that the use of HTC liquid and slurry into AD led to an increase in biomethane production up to 37% and 363%, respectively, compared to OFMSW. Methane production increased as the HTC process severity decreased, reaching its maximum at 180 °C, 1 h for both HTC products. Energy assessment demonstrated that the combustion of biogas produced by AD of HTC liquid and slurries covers up to 30% and 104% of the HTC thermal demand, respectively. When the energy from hydrochar and biogas combustion was recovered, the process efficiency reached 60%. Hence, HTC coupled with AD demonstrates to be an efficient way to valorize OFMSW.

水热碳化（HTC）被评估为一种有前途的处理方法，可以提高城市固体废物（OFMSW）有机部分的厌氧消化（AD）期间的生物甲烷潜力。OFMSW在不同条件下碳化，并测试了HTC产品进入AD的生物甲烷潜力。结果证明，与OFMSW相比，将HTC液体和浆液用于AD可使生物甲烷的产量分别增加37％和363％。甲烷产量随着HTC工艺严重程度的降低而增加，两种HTC产品在1 h达到180℃的最大值。能源评估表明，HTC液体和浆料的AD产生的沼气燃烧分别占HTC热需求的30％和104％。当碳氢化合物和沼气燃烧产生的能量被回收后，工艺效率达到60％。因此，HTC与AD结合被证明是一种增值OFMSW的有效方法。