The aim of this work was to evaluate biomethane production by anaerobic digestion using aqueous phase from Fast Pyrolysis of Douglas Fir Wood as substrate. The effect of biomass acid treatment and condensation temperature on the bio-oil chemical composition and aqueous phase separation with a fractional condensation system coupled to Auger reactor during pyrolysis at 500 °C was reported. As the first condenser temperature was augmented from 40 and 80 °C, the bio-oil yield obtained decreased from 30 to 16 wt% and the aqueous phase yield in the second condenser (kept at 25 °C) increased from 27 till 37 wt%. When the untreated biomass was pyrolyzed, the aqueous phase collected in the second condenser (at the first condenser operated at 80 °C) was anaerobically digested at 100 ppm for 400 h results in 31.3 NmL of CH₄/batch. However, the best result was attained after washed biomass with acetic acid (10%) previously to fast pyrolysis, obtaining 86.8 NmL of CH₄/batch using just 10 ppm, perhaps due to halved of formed hydroxyacetaldehyde and estimated levoglucosan content increases by more than three times at this condition. Thus, the attained results confirmed the viability of the adopted strategy to improve the anaerobic digestion of the aqueous phase obtained by fractional condensation systems for biomethane production.

中文翻译：

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热解水相生产生物甲烷：生物质酸洗涤和冷凝温度对生物油和水相组成的影响

这项工作的目的是评估使用道格拉斯冷杉木的快速热解产生的水相作为底物，通过厌氧消化产生的生物甲烷。报道了在500°C的热解过程中，利用分馏冷凝系统与Auger反应器耦合的生物质酸处理和冷凝温度对生物油化学成分和水相分离的影响。随着第一个冷凝器温度从40和80°C升高，获得的生物油产率从30 wt％降低到16 wt％，第二个冷凝器（保持在25°C）的水相产率从27 wt％增加到37 wt％ 。将未处理的生物质进行热解后，将收集在第二个冷凝器（在80°C下运行的第一个冷凝器）中的水相在100 ppm的条件下厌氧消化400 h，得到31.3 NmL的CH ₄/批量。但是，最好在快速热解之前用乙酸（10％）洗涤生物质后，仅用10 ppm即可获得86.8 NmL CH ₄ /批，这可能是由于形成的羟基乙醛减半，并且估计的左旋葡聚糖含量增加了超过10％，从而获得了最佳结果。在这种情况下三次。因此，获得的结果证实了所采用的策略的可行性，该策略改善了通过用于生物甲烷生产的分馏冷凝系统获得的水相的厌氧消化。