Li Gang, Hao Yuhang, Yang Tenglun, Xiao Wenbo, Pan Minmin, Huo Shuhao, Lyu Tao
School of Artificial Intelligence, Beijing Technology and Business University, Beijing 100048, China.
Department for Solar Materials, Helmholtz Centre for Environmental Research GmbH-UFZ, Permoserstraße 15, 04318 Leipzig, Germany.
Bioengineering (Basel). 2022 Nov 2;9(11):637. doi: 10.3390/bioengineering9110637.
Improving the efficiency of using energy and decreasing impacts on the environment will be an inevitable choice for future development. Based on this direction, three kinds of medium (modified anaerobic digestion wastewater, anaerobic digestion wastewater and a standard growth medium BG11) were used to culture microalgae towards achieving high-quality biodiesel products. The results showed that microalgae culturing with anaerobic digestate wastewater could increase lipid content (21.8%); however, the modified anaerobic digestion wastewater can boost the microalgal biomass production to 0.78 ± 0.01 g/L when compared with (0.35-0.54 g/L) the other two groups. Besides the first step lipid extraction, the elemental composition, thermogravimetric and pyrolysis products of the defatted microalgal residues were also analysed to delve into the utilisation potential of microalgae biomass. Defatted microalgae from modified wastewater by pyrolysis at 650 °C resulted in an increase in the total content of valuable products (39.47%) with no significant difference in the content of toxic compounds compared to other groups. Moreover, the results of the life cycle assessment showed that the environmental impact (388.9 mPET) was lower than that of raw wastewater (418.1 mPET) and standard medium (497.3 mPET)-cultivated groups. Consequently, the method of culturing microalgae in modified wastewater and pyrolyzing algal residues has a potential to increase renewable energy production and reduce environmental impact.
提高能源利用效率和减少对环境的影响将是未来发展的必然选择。基于这一方向，使用了三种培养基（改良厌氧消化废水、厌氧消化废水和标准生长培养基BG11）来培养微藻，以实现高质量生物柴油产品。结果表明，用厌氧消化废水培养微藻可提高脂质含量（21.8%）；然而，与其他两组（0.35 - 0.54 g/L）相比，改良厌氧消化废水可使微藻生物量产量提高到0.78±0.01 g/L。除了第一步脂质提取外，还对脱脂微藻残渣的元素组成、热重分析和热解产物进行了分析，以深入研究微藻生物质的利用潜力。在650℃下对改良废水脱脂微藻进行热解，与其他组相比，有价值产品的总含量增加（39.47%），有毒化合物含量无显著差异。此外，生命周期评估结果表明，环境影响（388.9 mPET）低于原废水（418.1 mPET）和标准培养基（497.3 mPET）培养组。因此，在改良废水中培养微藻并热解藻类残渣的方法有可能增加可再生能源产量并减少环境影响。
