Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China.
Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China.
Waste Manag. 2021 Feb 1;120:164-174. doi: 10.1016/j.wasman.2020.11.026. Epub 2020 Dec 9.
In this study, antibiotic residue was converted into bio-oil by hydrothermal liquefaction (HTL) in subcritical or supercritical ethanol/water system. The bio-oil yield increased firstly as the ethanol/water ratio < 1:1, reaction temperature < 280 °C, residence time < 150 min, and thereafter decreased. However, the bio-oil yield continuously decreased with a plunge at 15% as the solid/liquid ratio increased. The change tendency of O/C, H/C and N/C of bio-oil indicated different reaction mechanism of HTL. The addition of ethanol significantly promoted the esterification reaction, leading to increase of aliphatics content of bio-oil, especially branched long-chain aliphatics. Comprehensively considering the bio-oil yield, production cost, higher heating value (HHV) and chemical composition, the optimal process parameters of HTL were obtained as follows: ethanol/water ratio of 1:1, reaction temperature of 280 °C, residence time of 150 min, and solid/liquid ratio of 15%, under which the bio-oil yield was 33.29 wt%, HHV was 33.47 MJ/kg, and the main compositions of bio-oil were esters (>48%).
在这项研究中，抗生素残留通过亚临界或超临界乙醇/水体系中的水热液化（HTL）转化为生物油。生物油产率先随着乙醇/水比例<1:1、反应温度<280°C、停留时间<150min 而增加，然后降低。然而，随着固液比的增加，生物油产率连续下降，降幅为 15%。生物油的 O/C、H/C 和 N/C 的变化趋势表明了 HTL 的不同反应机制。乙醇的添加显著促进了酯化反应，导致生物油中脂肪族含量增加，特别是支链长链脂肪族。综合考虑生物油产率、生产成本、高位热值（HHV）和化学成分，得出 HTL 的最佳工艺参数如下：乙醇/水比为 1:1，反应温度为 280°C，停留时间为 150min，固液比为 15%，在此条件下生物油产率为 33.29wt%，HHV 为 33.47MJ/kg，生物油的主要成分是酯类（>48%）。
