An insight into carbon balance of product streams from hydrothermal liquefaction of Scenedesmus abundans biomass

PanneerSelvam SundarRajan, Kannappan Panchamoorthy Gopinath, Jayaseelan Arun, Kirubanandam GracePavithra, Kumar Pavendan and Antonysamy AdithyaJoseph

Renewable Energy, 2020, vol. 151, issue C, 79-87

Abstract: Lab-scale hybrid loop airlift photobioreactor (HLALPBR) was used to culture microalgae Scenedesmus abundans in domestic wastewater. The highest biomass productivity of 209 mg L−1 d−1 and concentration of 3.55 g L−1 were achieved. S abundans could eradicate chemical oxygen demand, dissolved inorganic nitrogen, and dissolved inorganic phosphorus by 80.19%, 90.73% and 86.31% respectively from domestic wastewater. Later, hydrothermal liquefaction of algal biomass yielded 35.5 wt% of bio-oil. Carbon mass balance between various product streams showed that per g of algae about 0.46, 0.15, 0.963 and 0.35 g of CO2 was sequestered by bio-char, bio-gas, bio-oil and post-HTL wastewater product streams respectively. Since bio-oil has low N and O content and higher heating value of 36.52 MJ/kg, those can be upgraded to transportation fuel. The conversion of S. abundans to bio-char as a carbon sink has been proposed for reducing emissions and increasing the sequestration of atmospheric carbon dioxide.

Keywords: CO2 sequestration; Microalgae; Wastewater; Photobioreactor; Hydrothermal liquefaction (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:151:y:2020:i:c:p:79-87

DOI: 10.1016/j.renene.2019.11.011

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