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Novel Bio-regeneration Concept via Using Rich Solution as Nutrition Resource for Microalgae Cultivation: Effect of pH and Feeding Modes

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Absorption–bioconversion hybrid process has the advantages of capturing CO2 in the form of bicarbonate in the absorber and utilizing bicarbonate as a carbon source for microalgae growth in the photoreactor.… Click to show full abstract

Absorption–bioconversion hybrid process has the advantages of capturing CO2 in the form of bicarbonate in the absorber and utilizing bicarbonate as a carbon source for microalgae growth in the photoreactor. It can simultaneously achieve CO2 capture and utilization and avoid energy consumption of rich solvent regeneration in conventional absorption processes. As a promising solvent for hybrid process, NH3 could capture CO2 at low cost and with high efficiency. However, a high concentration of regenerated NH3 in a photoreactor would adversely affect microalgae growth. Previous work indicated that batch-feeding cultivation and pH adjustment might be a promising alternative to reduce NH3 release rate and its inhibition to microalgae. In this work, the influence of batch-feeding interval (i.e., 3, 6, and 9 days) and pH (i.e., 7, 8, and unadjusted) on the performance of absorption–microalgae hybrid system was investigated. The experimental results indicated that pH control has a significant influence on the gro...

Keywords: novel bio; regeneration concept; cultivation; microalgae; regeneration; bio regeneration

Journal Title: ACS Sustainable Chemistry & Engineering
Year Published: 2019

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