Abstract：
This study employs response surface methodology and a central composite design (CCD) to optimize hydrothermal treatment (HTT) conditions for the valorization of food waste (FW). Lab-scale pressure reactor-based HTT processes are investigated to detect the effects of temperature (220-340 °C) and resident time (90-260 min) on elemental composition and fatty acid recovery in the hydrothermal liquid. Central to the study is the identification of temperature as the primary factor influencing food waste conversion during the HTT process, showcasing its impact on HTT product yields. The liquid fraction, rich in saturated fatty acids (SFA), demonstrates a temperature-dependent trend, with higher temperatures favoring SFA recovery. Specifically, HTT at 340 °C in 180 min exhibits the highest SFA percentages, reaching up to 52.5 wt%. The study establishes HTT as a promising avenue for nutrient recovery, with the liquid fraction yielding approximately 95% at optimized conditions. Furthermore, statistical analysis using response surface methodology predicts the optimal achievable yields for hydrochar and hydrothermal liquid at 6.15% and 93.85%, respectively, obtained at 320 °C for 200 min.
摘要：
这项研究采用响应面方法和中央复合设计（CCD）来优化水热处理（HTT）条件，以实现食物垃圾（FW）的增值。研究了基于实验室规模的压力反应器的HTT工艺，以检测温度（220-340°C）和停留时间（90-260分钟）对元素组成和水热液体中脂肪酸回收率的影响。研究的核心是确定温度是HTT过程中影响食物垃圾转化的主要因素，展示其对HTT产品产量的影响。液体部分，富含饱和脂肪酸（SFA），显示出与温度相关的趋势，较高的温度有利于SFA的恢复。具体来说,HTT在340°C在180分钟内表现出最高的SFA百分比，达到52.5wt%。该研究将HTT确立为营养回收的有希望的途径，在最佳条件下，液体部分的产量约为95％。此外，使用响应面方法的统计分析预测水炭和热液的最佳可实现收率为6.15%和93.85%，分别,在320°C下获得200分钟。
