Xia Lin, Chae Michael, Asomaning Justice, Omidghane Mehdi, Zhu Chengyong, Bressler David C
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, T6G 2P5 Canada.
Waste Biomass Valorization. 2020;11(12):6769-6780. doi: 10.1007/s12649-019-00897-2. Epub 2019 Dec 10.
The accumulating volumes of biosolids in lagoons worldwide have intensified the need to develop innovative wastewater treatment strategies. Here, we provide proof-of-concept for the incorporation of biosolids into the hydrolysis step of a two-step thermal conversion of lipids for production of renewable hydrocarbons, which can be utilized as renewable fuels. Brown grease was hydrolysed with biosolids or water at 260-280 °C for 60 min at a mass ratio of 1:1 feed to water or biosolids. The feedstock and products were characterized using various analytical techniques to compare the performance of biosolids to water. The results indicated that there was no significant difference in the degree of hydrolysis of brown grease when biosolids was used as water replacement. The fatty acids composition after hydrolysis when biosolids was used as a water replacement also remained largely unchanged. Hydrolysis of brown grease with biosolids could be achieved at pH ranging from 3.3 to 8.9, and at a lower than previously established temperature. Significantly, the rapid settling of solid material in biosolids observed after thermal hydrolysis of brown grease may reduce the necessity of biosolids settling lagoons. Thus, incorporation of biosolids into a lipid hydrolysis-pyrolysis process may simultaneously benefit the biofuel and waste management sectors.
全球泻湖中生物固体的积累量不断增加，这使得开发创新的废水处理策略的需求更为迫切。在此，我们提供了概念验证，即将生物固体纳入脂质两步热转化制可再生碳氢化合物水解步骤中，所产可再生碳氢化合物可用作可再生燃料。棕色油脂与生物固体或水在260 - 280°C下以1:1的进料与水或生物固体质量比水解60分钟。使用各种分析技术对原料和产物进行表征，以比较生物固体与水的性能。结果表明，用生物固体替代水时，棕色油脂的水解程度没有显著差异。用生物固体替代水进行水解后的脂肪酸组成也基本保持不变。棕色油脂与生物固体的水解可在pH值为3.3至8.9的范围内以及低于先前确定的温度下实现。重要的是，棕色油脂热水解后观察到生物固体中固体物质的快速沉降，这可能会减少生物固体沉降泻湖的必要性。因此，将生物固体纳入脂质水解 - 热解过程可能会同时使生物燃料和废物管理部门受益。
