Kitchen waste (KW) has gradually become a prominent problem in municipal solid waste treatment. Hydrothermal liquefaction (HTL) is a promising method used to make fuel oil from food and KW. However, the upgrading of bio-oil is particularly important for the sake of industrial reuse. In this study, the KW from university restaurants was subjected to HTL experiments in order to study theoretical feasibility. With the change of conversion temperature and residence time, the optimal conversion working conditions in this study were determined according to the quality and yield of the bio-oil. Moreover, the bio-oil upgrading effects of different additives (hydrogen chloride, sodium hydroxide, and iron(III) chloride) on the HTL of KW were studied. Alkaline additives have an inhibitory effect on the bio-oil yield and positive effect on coke yield. Acidic additives and iron (Fe)-containing additives can promote bio-oil yield. As an important aspect of upgrading, the effect on the nitrogen content of bio-oil with additives was revealed. The alkaline and Fe-containing additives have little effect on reducing the viscosity of the bio-oil while with the appropriate ratio (2.5 mol•kg⁻¹) of acidic additives to the raw material, the static and dynamic fluidity of the oil phase products are reduced to about 0.1 Pa•s.

厨房废物（KW）已逐渐成为城市固体废物处理中的突出问题。水热液化（HTL）是一种用于从食品和KW制备燃料油的有前途的方法。然而，为了工业再利用，生物油的升级特别重要。在这项研究中，对大学饭店的KW进行了HTL实验，以研究理论可行性。随着转化温度和停留时间的变化，根据生物油的质量和产量确定了本研究的最佳转化条件。此外，研究了不同添加剂（氯化氢，氢氧化钠和氯化铁（III））对KW HTL的生物油提质作用。碱性添加剂对生物油收率有抑制作用，对焦炭收率有积极作用。酸性添加剂和含铁（Fe）的添加剂可以提高生物油的产量。作为升级的重要方面，揭示了添加剂对生物油氮含量的影响。适当的比例（2.5 mol•kg）中，含碱和铁的添加剂对降低生物油的粘度几乎没有影响。^-1）酸性添加剂添加到原料中，油相产品的静态和动态流动性降低到约0.1 Pa•s。