LAUSR

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...