Journal
BIORESOURCE TECHNOLOGY
Volume 290, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121781
Keywords
Hybrid CO2 capture; Absorption; Microalgae; Bicarbonate; Chlorella sp.
Funding
- National key Research and Development project [2017YFE0127200]
- National Natural Science Foundation of China [21878228, 31701526]
- Natural Science Foundation of Tianjin City [17JCQNJC08500]
- Young Elite Scientists Sponsorship Program by Tianjin City [TJSQNTJ-2017-03]
- Basic Research Fees of Universities and Colleges in Tianjin [2017KJ001]
- Youth Teacher Innovation Fund of Tianjin University of Science Technology [2015LG26]
- International Cooperation Research Centre of Carbon Capture in Ultra-low Energy-consumption (Tianjin)
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As one of the most mature carbon capture technologies, thermal regeneration of rich CO2 absorption solvent is a crucial challenge due to its high energy consumption (typically in the range of 3-6 MJ/kg CO2). In this work, a concept of bio-regeneration was proposed using microalgae to convert bicarbonate (which is one of the dominant components in rich solution) into value-added biomass. To evaluate the performance of bio-regeneration, different rich solution (including NH4 HCO3 , KHCO3 and NaHCO3) were investigated. Experimental results indicated that NH4 HCO3 could be a promising bicarbonate carrier for the proposed absorption-microalgae hybrid process, which had a higher biomass productivity (55.36 mg.L (-1).d (-1)) compared to KHCO3 and NaHCO3 and carbon sequestration capacity could be up to 158.3 mg.L-1.d(-1). Meanwhile, pH adjustment was an effective approach to further intensify the performance of hybrid process. As a result, bio-regeneration of solvents could be a promising alternative to the conventional thermal regeneration.
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