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首页> 外文期刊>Applied Microbiology >Anaerobic Coculture of Microalgae with Thermosipho globiformans and Methanocaldococcus jannaschii at 68°C Enhances Generation of n-Alkane-Rich Biofuels after Pyrolysis
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Anaerobic Coculture of Microalgae with Thermosipho globiformans and Methanocaldococcus jannaschii at 68°C Enhances Generation of n-Alkane-Rich Biofuels after Pyrolysis

机译：微球藻与嗜热线虫和詹氏甲烷球菌在68°C的厌氧共培养可提高热解后富含正构烷烃的生物燃料的产生

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We tested different alga-bacterium-archaeon consortia to investigate the production of oil-like mixtures, expecting that n -alkane-rich biofuels might be synthesized after pyrolysis. Thermosipho globiformans and Methanocaldococcus jannaschii were cocultured at 68°C with microalgae for 9 days under two anaerobic conditions, followed by pyrolysis at 300°C for 4 days. Arthrospira platensis ( Cyanobacteria ), Dunaliella tertiolecta ( Chlorophyta ), Emiliania huxleyi ( Haptophyta ), and Euglena gracilis ( Euglenophyta ) served as microalgal raw materials. D. tertiolecta , E. huxleyi , and E. gracilis cocultured with the bacterium and archaeon inhibited their growth and CH_(4) production. E. huxleyi had the strongest inhibitory effect. Biofuel generation was enhanced by reducing impurities containing alkanenitriles during pyrolysis. The composition and amounts of n -alkanes produced by pyrolysis were closely related to the lipid contents and composition of the microalgae. Pyrolysis of A. platensis and D. tertiolecta containing mainly phospholipids and glycolipids generated short-carbon-chain n -alkanes ( n -tridecane to n -nonadecane) and considerable amounts of isoprenoids. E. gracilis also produced mainly short n -alkanes. In contrast, E. huxleyi containing long-chain (31 and 33 carbon atoms) alkenes and very long-chain (37 to 39 carbon atoms) alkenones, in addition to phospholipids and glycolipids, generated a high yield of n -alkanes of various lengths ( n -tridecane to n -pentatriacontane). The gas chromatography-mass spectrometry (GC-MS) profiles of these n -alkanes were similar to those of native petroleum crude oils despite containing a considerable amount of n -hentriacontane. The ratio of phytane to n -octadecane was also similar to that of native crude oils.
机译：我们测试了不同的藻-细菌-古生菌联合体，以研究类油混合物的产生，期望在热解后可以合成富含正烷烃的生物燃料。在两个厌氧条件下，将球形嗜热栖热球菌和詹纳氏甲烷球菌在68℃下与微藻共培养9天，然后在300℃下热解4天。作为微藻原料，有节肢动物（蓝藻），杜氏杜氏藻（Chlorophyta），Emililiania huxleyi（Haptophyta）和Euglena gracilis（Euglenophyta）。与细菌和古细菌共培养的D. tertiolecta，E。huxleyi和E. gracilis抑制了它们的生长和CH_（4）的产生。 E. huxleyi具有最强的抑制作用。通过减少热解过程中含有链烷腈的杂质，可以增强生物燃料的产生。热解产生的正构烷烃的组成和数量与微藻的脂质含量和组成密切相关。主要包含磷脂和糖脂的热解A. platensis和D. tertiolecta产生了短碳链正构烷烃（正十三烷至正十八烷）和大量的类异戊二烯。 E. gracilis也主要生产短链正构烷烃。相比之下，除了磷脂和糖脂外，含有长链（碳原子数为31和33的烯烃）和长链（碳原子数为37至39）的赫氏大肠杆菌产生了高产率的各种长度的正构烷烃（正十三烷至正戊烷）。这些正构烷烃的气相色谱-质谱（GC-MS）谱图与天然石油原油的谱图相似，​​尽管其中含有大量的正庚烷。植烷与正十八烷的比例也与天然原油相似。

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