INRA, UR50, Laboratoire de Biotechnologie de L'Environnement, Avenue des Etangs, Narbonne 11100, France.
Bioresour Technol. 2013 Feb;129:219-23. doi: 10.1016/j.biortech.2012.10.123. Epub 2012 Nov 2.
Biogas production is one of the means to produce a biofuel from microalgae. Biomass consisting mainly of Scenedesmus sp. was thermally pretreated and optimum pretreatment length (1 h) and temperature (90 °C) was selected. Different chemical composition among batches stored at 4 °C for different lengths of time resulted in organic matter hydrolysis percentages ranging from 3% to 7%. The lower percentages were attributed to cell wall thickening observed during storage for 45 days. The different hydrolysis percentages did not cause differences in anaerobic digestion. Pretreatment of Scenedesmus sp. at 90 °C for 1h increased methane production 2.9 and 3.4-fold at organic loading rates (OLR) of 1 and 2.5 kg COD m(-3) day(-1), respectively. Regardless the OLR, inhibition caused by organic overloading or ammonia toxicity were not detected. Despite enhanced methane production, anaerobic biodegradability of this biomass remained low (32%). Therefore, this microalga is not a suitable feedstock for biogas production unless a more suitable pretreatment can be found.
沼气生产是利用微藻生产生物燃料的一种手段。主要由栅藻属组成的生物质经过热预处理，选择最佳预处理时间（1 小时）和温度（90°C）。不同批次的生物质在 4°C 下储存不同时间，其化学成分不同，导致有机物水解率在 3%至 7%之间变化。较低的水解率归因于储存 45 天时观察到的细胞壁增厚。不同的水解率不会导致厌氧消化产生差异。在 90°C 下预处理 1 小时，分别将有机负荷率（OLR）为 1 和 2.5 kg COD m(-3) day(-1)时的甲烷产量提高了 2.9 和 3.4 倍。无论 OLR 如何，都没有检测到由于有机超负荷或氨毒性引起的抑制。尽管甲烷产量增加，但这种生物质的厌氧生物降解性仍然很低（32%）。因此，除非找到更合适的预处理方法，否则这种微藻不适合用于沼气生产。
