Bicarbonate-based cultivation of Dunaliella salina for enhancing carbon utilization efficiency. (August 2017)

• Record Type: Journal Article
• Authors: Kim, Ga-Yeong; Heo, Jina; Kim, Hee-Sik; Han, Jong-In
• Is Part Of: Bioresource technology. Volume 237(2017)
• Page Start: 72
• Page End: 77
• Publication Date: 2017-08
• Subjects: CO2 capture and utilization (CCU) -- Microalgae -- Dunaliella salina -- Sodium bicarbonate (NaHCO3) -- Bicarbonate cultivation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.04.009
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: To utilize bicarbonate as carbon source for microalgae cultivation was investigated. The specific growth rate of Dunaliella sp. was significantly increased with NaHCO3 . pH control was important to obtain high biomass productivity with bicarbonate. NaHCO3 positively affected not only for growth but also for carotenoid production. With bicarbonate, carbon utilization efficiency was apparently higher than with CO2 . Abstract: In this study, bicarbonate was proposed as an alternative carbon source to overcome exceedingly low CO2 fixation efficiency of conventional microalgae cultivation system. 5 g L −1 of sodium bicarbonate was found to well support the growth of Dunaliella salina, showing 2.84-fold higher specific growth rate than a bicarbonate-free control. This bicarbonate-fed cultivation also could yield biomass productivity similar to that of CO2 -based system as long as pH was controlled. While the supplied CO2, because of its being a gas, was mostly lost and only 3.59% of it was used for biomass synthesis, bicarbonate was effectively incorporated into the biomass with 91.40% of carbon utilization efficiency. This study showed that the bicarbonate-based microalgae cultivation is indeed possible, and can even become a truly environment-friendly and workable approach, provided that a CO2 mineralization technology is concomitantly established.