College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China.
School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China.
Sci Total Environ. 2019 Feb 15;651(Pt 1):61-69. doi: 10.1016/j.scitotenv.2018.09.175. Epub 2018 Sep 14.
Hydrothermal liquefaction (HTL) is a promising technology for converting organic wastes into bio-crude oil, with organic-rich post-hydrothermal liquefaction wastewater (PHWW) as by-product. In this study, zeolite adsorption and anaerobic digestion (AD) were integrated to improve the methane production and energy recovery of PHWW from Chlorella 1067. A statistical design for maximum toxicants removal by zeolite was applied before AD process. Zeolite could mitigate the inhibition associated to compounds such as ammonia, N-heterocyclic compounds, etc. in PHWW and thereby shortening the lag phase and increasing methane production by 32-117% compared with that without zeolite adsorption. Zeolite adsorption also increased energy recovery efficiency (up to 70.5%) for this integrated system. Integration of HTL and AD brought higher energetic return from feedstock via oil and biomethane production, which may offer insight into industrial application of microalgae biomass in the circular economy. In addition, carbon and nitrogen flow for the integrated process was determined.
水热液化（HTL）是一种将有机废物转化为生物原油的有前途的技术，其副产物为富含有机物的后水热液化废水（PHWW）。在这项研究中，沸石吸附和厌氧消化（AD）被集成在一起，以提高从绿藻 1067 中提取的 PHWW 的甲烷产量和能源回收。在 AD 工艺之前，应用了沸石去除最大毒物的统计设计。沸石可以减轻 PHWW 中氨、杂环化合物等化合物的抑制作用，从而缩短迟滞期，与没有沸石吸附相比，甲烷产量增加 32-117%。沸石吸附还提高了该集成系统的能量回收效率（高达 70.5%）。HTL 和 AD 的集成通过油和生物甲烷的生产从原料中获得了更高的能量回报，这可能为微藻生物质在循环经济中的工业应用提供了新的思路。此外，还确定了集成工艺的碳氮流动。
