Journal of Chemistry and Chemical Research

The treatment of wastewater containing high concentrations of calcium and magnesium ions is closely related to many chemical-related companies. The discharge of non-treated wastewater containing high concentrations of calcium and magnesium ions not only pollutes the environment and endangers human health, but also seriously wastes resources. The precipitation of calcium and magnesium ions by CO₂ is conductive to achieving the dual-carbon goal, besides exploring new research fields and directions for the capture, utilization and storage of CO₂ (CCUS). To this end, this paper reviews the progress on the process of CO₂ capturing with wastewater containing high concentrations of calcium and magnesium ions to get high value-added alkaline magnesium carbonate and calcium carbonate. The research on the mechanism of precipitation of calcium and magnesium ions by CO₂, the application of in-situ characterization technology and the direct capture or storage of CO₂ by brine of seawater/salt-lake was also highlighted. This review is expected to be of great reference to help relevant research institutes, especially to companies that release CO₂ and discharge wastewater containing high concentrations of calcium and magnesium ions. In addition, this review is expected to contribute to the continuous optimization and enhancement of CO₂ capturing from wastewater containing high concentrations of calcium and magnesium ions.

High-salt wastewater; Calcium and magnesium ion separation; Carbon dioxide capture; A carbonization; Secondary carbonization