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Enhanced Phototrophic Biomass Productivity through Supply of Hydrogen Gas
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2020-09-22 , DOI: 10.1021/acs.estlett.0c00718
Tom Sleutels 1 , Rita Sebastião Bernardo 1 , Philipp Kuntke 1, 2 , Marcel Janssen 3 , Cees J. N. Buisman 1, 2 , Hubertus V. M. Hamelers 1
Affiliation  

Industrial production of phototrophic microorganisms is often hindered by low productivity due to limited light availability and therefore requires large land areas. This letter demonstrates that supply of hydrogen gas (H2) increases in phototrophic biomass productivity compared to a culture growing on light only. Experiments were performed growing Synechocystis sp. in batch bottles, with and without H2 in the headspace, which were exposed to light intensities of 70 and 100 μmol/m2/s. At 70 μmol/m2/s with H2, the average increase in biomass was 96 mg DW/L/d, whereas at 100 μmol/m2/s without H2, the average increase in biomass was 27 mg DW/L/d. Even at lower light intensity, the addition of H2 tripled the biomass yield compared to growth under light only. Photoreduction and photosynthesis occurred simultaneously, as both H2 consumption and O2 production were measured during biomass growth. Photoreduction used 1.85 mmol of H2 to produce 1.0 mmol of biomass, while photosynthesis produced 1.95 mmol of biomass. After transferring the culture to the dark, growth ceased, also in the presence of H2, showing that both light and H2 were needed for growth. A renewable H2 supply for higher biomass productivity is attractive since the combined efficiency of photovoltaics and electrolysis exceeds the photosynthetic efficiency.

中文翻译:

通过提供氢气提高光养生物质生产力

由于光的可获得性有限,光养微生物的工业生产常常因生产率低而受到阻碍,因此需要大面积的土地。这封信证明,与仅在光照下生长的培养物相比,氢气(H 2)的供应增加了营养养分生物量的生产力。进行了生长集胞藻的实验在分批瓶中,顶部空间中有H 2和没有H 2,这些瓶暴露于70和100μmol/ m 2 / s的光强度。含H 2为70μmol/ m 2 / s时,平均生物量增加为96 mg DW / L / d,而不含H 2为100μmol/ m 2 / s,平均生物量增加为27 mg DW / L / d。甚至在较低的光强度下,与仅在光下生长相比,H 2的添加使生物量产量增加了两倍。光还原和光合作用同时发生,因为在生物量生长期间测量了H 2消耗和O 2产生。光还原使用1.85 mmol的H 2产生1.0 mmol的生物质,而光合作用产生1.95 mmol的生物质。将培养物转移到黑暗中后,在H 2存在下也停止了生长,这表明光和H 2都是生长所必需的。可再生H 2 提供更高的生物质生产力是有吸引力的,因为光伏和电解的综合效率超过了光合作用效率。
更新日期:2020-11-12
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