Abstract Pelagic Sargassum inundation of coastlines across the North Atlantic Ocean is an ongoing challenge which poses a great threat to economic productivity. This novel study evaluated the valorisation of these invasive seaweeds into biogas and fertiliser using hydrothermal pretreatment and anaerobic digestion technologies. Increasing the severity factor of hydrothermal pretreatment from 1.59 to 3.83 promoted the degradation of organic particulates in Sargassum, resulting in a maximum soluble chemical oxygen demand yield of 27,250 ± 75 mg/L or 237% greater than the unpretreated biomass. However, no linear relationship exists between increased solubilisation and biogas productivity. Peak methane recovery of 116.72 ± 2.14 mL/gVS was achieved at severity factor 2.65 with the decrease thereafter attributed to the formation of Maillard reaction products and inhibitory compounds during hydrothermal pretreatment. The hydrogen sulfide content in the biogas generated also diminished from 3% to 1%. Additionally, the digestate of biogas production is pathogen-free, nutrient-rich and exhibits bio-fertiliser potential.

中文翻译：

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水热预处理对远洋马尾藻厌氧消化用于沼气和肥料回收的效率

摘要 北大西洋海岸线被远洋马尾藻淹没是一个持续的挑战，对经济生产力构成巨大威胁。这项新研究使用水热预处理和厌氧消化技术评估了这些入侵海藻转化为沼气和肥料的价值。将水热预处理的严重程度因子从 1.59 增加到 3.83，促进了马尾藻中有机颗粒的降解，导致最大可溶性化学需氧量产量为 27,250 ± 75 mg/L，比未经预处理的生物质高 237%。然而，增溶和沼气生产率之间不存在线性关系。在严重性因子 2 下实现了 116.72 ± 2.14 mL/gVS 的峰值甲烷回收率。65 之后的下降归因于水热预处理过程中美拉德反应产物和抑制性化合物的形成。产生的沼气中的硫化氢含量也从 3% 减少到 1%。此外，沼气生产的消化物不含病原体、营养丰富且具有生物肥料潜力。