Integrating bicarbonate-based microalgal production with alkaline sewage for ocean negative carbon emissions - ScienceDirect

[Michael Hayes]

"Sewage-delivered ocean alkalinity enhancement (OAE) has been considered a promising ocean negative carbon emissions (ONCE) approach due to high efficiency of carbon sequestration, strong operability, and low environmental risk.

• Microalgae could efficiently use bicarbonate as a carbon-concentrating mechanism, resulting in spent medium with an elevated pH and stable alkalinity which could be used as cheap or even free alkaline materials for OAE.

• Bicarbonate-based microalgal spent aqueous alkaline medium is a better material for OAE than solid alkaline mineral in terms of high solubility and alkalinity stability in water, as well as high utilization efficiency.

• Integrating bicarbonate-based microalgal production and sewage alkalinity enhancement for ONCE is proposed, aiming at simultaneously achieving efficient carbon neutralization and high economic value."

https://www.sciencedirect.com/science/article/abs/pii/S0167779924001781