School of Energy Science and Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India.
School of Energy Science and Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India; Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, India.
Bioresour Technol. 2022 Mar;348:126784. doi: 10.1016/j.biortech.2022.126784. Epub 2022 Jan 29.
NOx and SOx present in flue gas inhibit microalgal based CO mitigation process. In this work, 13 microalgal strains were screened to evaluate their gradual acclimation capacity to toxic flue gas compounds, by testing their growth capability and photosynthetic ability in dissolved flue gas compounds. Six strains out of them were evaluated for their acclimation to bicarbonate and 15% CO as sole carbon sources. Two strains, Micractinium pusillum KMC8 and Scenedesmus acutus NCIM5584 were found to accumulate nitrite as fixed nitrogen and showed improved growth performance in photobioreactor upon stepwise acclimation to bisulphite/sulphite. Notably, the strain KMC8 showed a high tolerance and rapidly acclimated dissolved flue gas compounds with higher biomass yield (1.32 g L) and neutral lipid accumulation (32%), enhanced CO utilization efficiency (3.07%) and CO fixation rate (136.79 mg L d) post acclimation. KMC8 sustained its stability in biomass and lipid productivity while simultaneously bio-mitigated CO under semi-continuous mode.
烟气中的氮氧化物（NOx）和硫氧化物（SOx）会抑制基于微藻的 CO 减排过程。在这项工作中，筛选了 13 种微藻菌株，通过测试它们在溶解烟气化合物中的生长能力和光合作用能力，评估它们对有毒烟气化合物的逐渐适应能力。其中 6 种菌株被评估了对碳酸氢盐和 15%CO 的适应能力，作为唯一的碳源。两种菌株，Micractinium pusillum KMC8 和 Scenedesmus acutus NCIM5584 被发现可以将亚硝酸盐作为固定氮积累，并在逐步适应亚硫酸盐/硫酸盐后，在光生物反应器中表现出更好的生长性能。值得注意的是，菌株 KMC8 表现出较高的耐受性，能够快速适应溶解烟气化合物，具有更高的生物量产量（1.32 g/L）和中性脂质积累（32%），增强了 CO 的利用效率（3.07%）和 CO 固定率（136.79 mg/L/d）。KMC8 在半连续模式下能够同时稳定地保持生物量和脂质生产力，同时生物减排 CO。
