Aslam Ambreen, Thomas-Hall Skye R, Manzoor Maleeha, Jabeen Faiza, Iqbal Munawar, Uz Zaman Qamar, Schenk Peer M, Asif Tahir M
Department of Environmental Science, University of Lahore, Lahore, Pakistan; Algae Biotechnology Laboratory, School of Agriculture and Food Sciences, University of Queensland, Brisbane, Queensland 4072, Australia.
Algae Biotechnology Laboratory, School of Agriculture and Food Sciences, University of Queensland, Brisbane, Queensland 4072, Australia.
J Photochem Photobiol B. 2018 Feb;179:126-133. doi: 10.1016/j.jphotobiol.2018.01.003. Epub 2018 Jan 11.
Biodiesel is produced by transesterification of fatty acid methyl esters (FAME) from oleaginous microalgae feedstock. Biodiesel fuel properties were studied and compared with biodiesel standards. Qualitative analysis of FAME was done while cultivating mixed microalgae consortia under three concentrations of coal fired flue gas (1%, 3.0% and 5.5% CO). Under 1% CO concentration (flue gas), the FAME content was 280.3 μg/mL, whereas the lipid content was 14.03 μg/mL/D (day). Both FAMEs and lipid contents were low at other CO concentrations (3.0 and 5.5%). However, mixed consortia in the presence of phosphate buffer and flue gas (PB + FG) showed higher saturated fatty acids (SFA) (36.28%) and unsaturated fatty acids (UFA) (63.72%) versus 5.5% CO concentration, which might be responsible for oxidative stability of biodiesel. Subsequently, higher cetane number (52) and low iodine value (136.3 gI/100 g) biodiesel produced from mixed consortia (PB + FG) under 5.5% CO along with 50 mM phosphate buffer were found in accordance with European (EN 14214) standard. Results revealed that phosphate buffer significantly enhanced the biodiesel quality, but reduced the FAME yield. This study intended to develop an integrated approach for significant improvement in biodiesel quality under surplus phosphorus by utilizing waste flue gas (as CO source) using microalgae. The CO sequestration from industrial flue gas not only reduced greenhouse gases, but may also ensure the sustainable and eco-benign production of biodiesel.
生物柴油是通过对含油微藻原料中的脂肪酸甲酯（FAME）进行酯交换反应生产的。对生物柴油的燃料特性进行了研究，并与生物柴油标准进行了比较。在三种浓度的燃煤烟气（1%、3.0%和5.5% CO）下培养混合微藻聚生体时，对FAME进行了定性分析。在1% CO浓度（烟气）下，FAME含量为280.3μg/mL，而脂质含量为14.03μg/mL/天（天）。在其他CO浓度（3.0%和5.5%）下，FAME和脂质含量均较低。然而，与5.5% CO浓度相比，存在磷酸盐缓冲液和烟气（PB + FG）的混合聚生体显示出更高的饱和脂肪酸（SFA）（36.28%）和不饱和脂肪酸（UFA）（63.72%），这可能是生物柴油氧化稳定性的原因。随后，发现在5.5% CO以及50 mM磷酸盐缓冲液条件下，由混合聚生体（PB + FG）生产的十六烷值较高（52）且碘值较低（136.3 gI/100 g）的生物柴油符合欧洲（EN 14214）标准。结果表明，磷酸盐缓冲液显著提高了生物柴油质量，但降低了FAME产量。本研究旨在开发一种综合方法，通过利用微藻利用废气烟道气（作为CO源）在磷过剩的情况下显著提高生物柴油质量。从工业烟道气中封存CO不仅减少了温室气体，还可能确保生物柴油的可持续和环境友好型生产。
